CN103966415A - Compound steel ball tempering device by using waste heat - Google Patents

Abstract

The invention relates to a compound steel ball tempering device by using waste heat, which comprises a double-layer tempering device (1), a steel ball severe-convection cooling device (2), two high-temperature-resistant steel ball lifting conveyors (3) and a waste heat pipe system (4), wherein one high-temperature-resistant steel ball lifting conveyor (3) is positioned between the discharge end of the double-layer tempering device (1) and the feed end of the steel ball severe-convection cooling device (2), the other high-temperature-resistant steel ball lifting conveyor (3) is positioned between the discharge end of the steel ball severe-convection cooling device (2) and the feed end of the double-layer tempering device (1). The compound steel ball tempering device by using the waste heat, provided by the invention, is low in energy consumption and good in tempering effect.

Description

Steel ball compound waste heat tempering device

technical field

The invention relates to a tempering process, in particular to a process for tempering and heating hot-rolled steel balls by using the residual heat of high-temperature flue gas generated during early heating, and belongs to the technical field of hot-rolled steel ball production.

Background technique

At present, hot-rolled steel ball is a brand-new rolling process technology, which is a technological breakthrough in the ball milling steel ball manufacturing industry, and is gradually replacing cast balls. The hot-rolled steel ball process has the following characteristics:

1. Hot-rolled steel ball has many advantages of steel. It is rolled and formed by special equipment and then heat-treated to become a high-quality grinding ball;

2. High production efficiency, large production capacity, mechanized ball rolling production, high degree of automation, no manual production process, less labor force, and less interference from human factors;

3. Low energy consumption, no pollution, low labor intensity and low production cost;

4. The internal quality is stable, the metallographic structure is dense, the grain is fine, not easy to deform, the wear resistance is good, and the impact toughness is as high as 18-28J/CM2;

5. Good forming, small roundness deviation, good appearance quality;

6. The specific weight is greater than 7.85g/cm3;

7. The hardness of the steel ball is high, up to 62~65HRC, and the hardness is uniform inside and outside, and the hardness difference is small; the wear rate is low, and the service life is long, which is about 2 times that of the existing ordinary cast steel ball and forged steel ball, and the price is equivalent;

Therefore, hot-rolled steel ball products are widely used in various ferrous and non-ferrous metal mine dressing plants, thermal power plants, cement plants, refractory plants and other industries, and are well received by domestic and foreign customers;

At present, forged (rolled) steel balls are generally used in the ferrous metallurgical industry standard (YB/T 091-2005) to professionally produce various specifications of hot-rolled ball-milled steel balls. The diameter range of steel balls is Φ20-Φ150mm. The diameter of the hot-rolled round steel bar containing relevant chemical elements in a specific configuration ratio is similar to the nominal diameter of the steel ball; the main production process of the conventional hot-rolled steel ball is as follows:

Step 1. After inspection, the cut-to-length round steel bar in the steel factory is cut into steel ball blanks according to the cut-to-length length;

Step 2. The cut steel balls and bars are first heated to a suitable temperature in a continuous heating furnace;

Step 3. After the red-hot bar is fed into the steel ball mill, it rotates between two rolls with a special spiral pass, and is continuously rolled into steel balls. Each steel ball mill Minutes can be rolled into 60-360 steel balls;

Step 4. The red-hot steel ball after rolling and forming immediately enters the online heat treatment equipment for quenching-tempering heat treatment, so that the steel ball obtains a high and uniform hardness;

Step 5. The products that pass the inspection are sent to the finished product warehouse, and then sent to the customer after packaging;

However, it has been found through actual production that the above-mentioned process of producing hot-rolled steel balls has the following prominent problems: there are many limitations in the primary tempering process and equipment in step 4, resulting in high energy consumption, and the steel after tempering The loss of ball hardness is large and the uniformity is poor, so it needs to be improved urgently.

Contents of the invention

The object of the present invention is to overcome the above disadvantages, and provide a steel ball composite residual heat tempering device with low energy consumption and good tempering effect.

The object of the present invention is achieved in this way: a steel ball composite waste heat tempering device, the device includes a double-layer tempering device, a steel ball strong convection cooling device, a high temperature resistant steel ball lifting conveyor and a waste heat pipe system, the There are two high-temperature-resistant steel ball lifting conveyors, one is located between the discharge end of the double-layer tempering device and the feed end of the steel ball strong convection cooling device, and the other is located at the steel ball strong convection cooling device. Between the discharge end and the feed end of the double-layer tempering device.

The double-layer tempering device includes a lower bracket and an upper bracket installed above the lower bracket. The lower bracket and the upper bracket are respectively horizontally installed with a lower chain conveyor belt and an upper chain conveyor belt. A waste heat pipe system is installed On the lower support and the upper support, the waste heat pipe system includes a waste heat input pipe, an upper waste heat pipe and a lower waste heat pipe. One end of the waste heat input pipe is connected to the waste heat source, and the other end is connected to the upper waste heat pipe and the lower waste heat pipe. The upper waste heat pipe and the lower waste heat pipe are respectively installed on the upper support and the lower support, and the upper waste heat pipe and the lower waste heat pipe are horizontally connected with a plurality of branch pipes, and the above branches are respectively located in the lower chain conveyor belt and the upper chain The lower part of the conveyor belt; multiple slits are opened on the branch pipes.

The invention discloses a steel ball composite residual heat tempering process. The upper bracket and the lower bracket are both closed structures, and the right end and the left end of the upper bracket and the lower bracket are provided with a material inlet and a material outlet, and the outlet located at the left end There is an exhaust fume hood installed at the feed port.

The steel ball compound waste heat tempering process of the present invention adopts a steel ball strong convection cooling device in the above step 2. The steel ball strong convection cooling device includes a bracket, and a conveyor belt for transporting the steel balls to be cooled is installed in the bracket. The left and right ends of the bracket are provided with inlets and outlets, the upper part of the front and rear side walls of the bracket is provided with a sealing plate for sealing, and the lower part forms an air inlet, and the top of the bracket is equipped with a windshield with a conical structure, and the windshield The top of the fan is connected with a blower through an air duct.

The steel ball composite waste heat tempering process of the present invention, between the above step 1 and step 2, and between step 2 and step 3, the steel balls are transferred and transported by the high temperature resistant steel ball lifting conveyor; the high temperature resistant steel ball The ball lift conveyor includes a frame set obliquely, and the frame is provided with a transmission belt arranged obliquely along it, and the above-mentioned conveyor belt is driven by a drive shaft located on the upper part of the frame set obliquely, and the above-mentioned conveyor belt Support is provided by a driven shaft located in the lower part of the frame set diagonally.

The invention discloses a steel ball composite residual heat tempering process, wherein the above-mentioned driven shaft is sleeved on a slider bearing seat through a bearing, and the slider bearing seat is slidably connected to the above-mentioned machine frame.

The present invention is a steel ball composite residual heat tempering process. The slider bearing seat is fixed with a slider embedded in the chute on the frame, and one end of an adjusting screw is screwed on the slider bearing seat, and the other is One end is screwed on a fixed plate fixed on the frame.

The present invention relates to a steel ball composite residual heat tempering process, wherein the transmission belt includes a chain mechanism arranged symmetrically on the left and right sides and a connecting plate connected between the chain structures, and the above chain structure includes end-to-end chain plates, Connecting lug plates connected end to end, and rollers connected between the chain plate and the connecting lug plates, the connecting plates include U-shaped plates and L-shaped plates arranged at intervals in sequence, and the left and right sides of the U-shaped plates and L-shaped plates The two ends are respectively fixed on the connecting ear plates located on the left and right sides, and the U-shaped plate and the L-shaped plate form a bucket structure.

Compared with prior art, the beneficial effect of the present invention is:

In the present invention, the double-layer tempering device, the steel ball strong convection cooling device, the high-temperature-resistant steel ball lifting conveyor and the waste heat pipe system cooperate with the secondary tempering process to temper the steel balls (the double-layer structure of the tempering device makes the double-tempering process possible). The fire can be carried out at the same time, which improves the energy utilization rate and speeds up the tempering efficiency), thereby improving the metallographic structure of the steel ball, reducing the hardness loss of the steel ball after tempering, and improving the toughness of the steel ball. Help enterprises improve the market competitiveness of their products.

Description of drawings

Fig. 1 is a schematic structural diagram of the assembly line equipment of the steel ball compound waste heat tempering device of the present invention.

Fig. 2 is a schematic structural diagram of the waste heat pipe system of the steel ball composite waste heat tempering device of the present invention.

Fig. 3 is a partial structural schematic diagram of the chain conveyor belt of the high-temperature-resistant steel ball lifting conveyor of the steel ball composite waste heat tempering device of the present invention.

Fig. 4 is a partial structural diagram of the chain mechanism of the high-temperature-resistant steel ball lifting conveyor of the steel ball composite waste heat tempering device of the present invention.

Fig. 5 is a structural schematic diagram of the bucket conveying mechanism of the high-temperature-resistant steel ball lifting conveyor of the steel ball composite waste heat tempering device of the present invention.

in:

Double-layer tempering device 1, steel ball strong convection cooling device 2, high temperature resistant steel ball lifting conveyor 3, waste heat pipe system 4;

Lower bracket 1.1, upper bracket 1.2, lower chain conveyor belt 1.3, upper chain conveyor belt 1.4;

Bracket 2.1, inlet and outlet 2.2, sealing plate 2.3, air inlet 2.4, wind cover 2.5, air duct 2.6;

Frame 3.1, transmission belt 3.2, driving shaft 3.3, driven shaft 3.4, slider bearing seat 3.5, fixed plate 3.6, adjusting screw 3.7;

Chain plate 3.2.1, roller 3.2.2, connecting ear plate 3.2.3, U-shaped plate 3.2.4, L-shaped plate 3.2.5;

Waste heat input pipe 4.1, upper waste heat pipe 4.2, lower waste heat pipe 4.3, branch pipe 4.4, slit 4.5.

Detailed ways

Referring to Figures 1 to 5, the present invention relates to a steel ball composite waste heat tempering device, which includes a double-layer tempering device 1, a steel ball strong convection cooling device 2, a high temperature resistant steel ball lifting conveyor 3 and a waste heat Pipe system 4, the high-temperature-resistant steel ball lifting conveyor 3 is provided with two sets, one is located between the discharge end of the double-layer tempering device 1 and the feed end of the steel ball strong convection cooling device 2, and the other is Located between the discharge end of the steel ball strong convection cooling device 2 and the feed end of the double-layer tempering device 1,

The double-layer tempering device 1 includes a lower support 1.1 and an upper support 1.2 installed above the lower support 1.1, and the lower support 1.1 and the upper support 1.2 are respectively horizontally installed with a lower chain conveyor belt 1.3 and an upper chain transmission With 1.4, there is a waste heat pipe system 4 installed on the lower support 1.1 and the upper support 1.2. Specifically, the waste heat pipe system 4 includes a waste heat input pipe 4.1, an upper waste heat pipe 4.2 and a lower waste heat pipe 4.3. The waste heat One end of the input pipe 4.1 is connected to the waste heat source (such as the high-temperature flue gas recovery pipe in the front-end round steel heating device in this patent), and the other end is connected to the upper waste heat pipe 4.2 and the lower waste heat pipe 4.3. The upper waste heat pipe 4.2 and The lower waste heat pipe 4.3 is respectively installed on the upper support 1.2 and the lower support 1.1, and the upper waste heat pipe 4.2 and the lower waste heat pipe 4.3 are connected with a plurality of branch pipes 4.4 horizontally, and the above branch pipes 4.4 are respectively located in the lower chain conveyor belt 1.3 and the upper chain The bottom of the chain conveyor belt 1.4; the branch pipe 4.4 has a plurality of slits 4.5, so that the high-temperature flue gas can evenly heat the steel balls of the lower chain conveyor belt 1.3 and the upper chain conveyor belt 1.4; at the same time, the upper layer Both the bracket 1.2 and the lower bracket 1.1 are of closed structure, and only the feed inlet and the discharge port respectively arranged at the right end and the left end are left, and an exhaust gas hood is installed at the discharge port at the left end, which is used to clean the high Centralized collection and discharge of flue gas;

The steel ball strong convection cooling device 2 includes a bracket 2.1, a conveyor belt for transporting the steel balls to be cooled is installed in the bracket 2.1, the left and right ends of the bracket 2.1 are provided with an inlet and outlet 2.2, and the front and rear side walls of the bracket 2.1 The upper part is provided with a sealing plate 2.3 for sealing, and the lower part forms an air inlet 2.4—preferably, the air inlet 2.4 is located below the above-mentioned conveyor belt for transporting the steel balls to be cooled, and the top of the support 2.1 is equipped with a conical-shaped air inlet. Cover 2.5, and the top of the wind cover 2.5 is connected to a fan through the air duct 2.6. When the steel ball strong convection cooling device 2 is working, due to the existence of the fan, a negative pressure is formed in the cavity of the bracket 2.1, so that The external cold air continuously enters the cavity of the bracket 2.1 from the air inlet 2.4, and then is sucked out by the air-inducing pipe 2.6 on the top after cooling the steel ball;

The high-temperature-resistant steel ball lifting conveyor 3 includes a frame 3.1 arranged obliquely, and the frame 3.1 is provided with a conveyor belt 3.2 arranged obliquely along it, and the conveyor belt 3.2 includes symmetrically arranged left and right sides. a chain mechanism and connecting plates connected between the chain structures,

The above-mentioned chain structure includes end-to-end chain plates 3.2.1, end-to-end connecting lugs 3.2.3, and rollers 3.2.2 connected between the chain plates 3.2.1 and connecting lugs 3.2.3 (specifically In other words, the adjacent chain plates 3.2.1 and the adjacent connecting ear plates 3.2.3 are hinged through the pin shaft, and the roller 3.2.2 is also set on the pin shaft, and the roller 3.2.2 is located on the chain plate 3.2 .1 and connecting lug plate 3.2.3), the connecting plate includes U-shaped plate 3.2.4 and L-shaped plate 3.2.5 arranged at intervals in sequence, and the U-shaped plate 3.2.4 and L-shaped plate 3.2 The left and right ends of .5 are respectively fixed on the connecting ear plates 3.2.3 on the left and right sides, and the U-shaped plate 3.2.4 and the L-shaped plate 3.2.5 form a bucket structure, so that when carrying out material lifting, The steel ball will not roll down (preferably, the diameter of the steel ball is larger than the width of the bottom plate constituting the L-shaped plate 3.2.5)—the left and right sides of the L-shaped plate 3.2.5 can also be vertically provided with baffles for Promote the steel ball with smaller diameter, which helps to improve the versatility of the product;

The above-mentioned transmission belt 3.2 is driven by the drive shaft 3.3 located on the top of the obliquely arranged frame 3.1 (the drive shaft 3.3 can be driven by an electric motor or a hydraulic motor or any other drive mechanism, all within the protection scope of this patent), and at the same time The above-mentioned transmission belt 3.2 is supported and driven by the driven shaft 3.4 located at the bottom of the obliquely arranged frame 3.1 and tensioned. At this time, the driven shaft 3.4 is sleeved on the slider bearing seat 3.5 through a bearing. The block bearing seat 3.5 is slidably connected to the frame 3.1. Specifically, the slider bearing seat 3.5 is fixed with a slider embedded in the chute on the frame 3.1, and one end of an adjusting screw 3.7 is screwed into the frame. On the slider bearing seat 3.5, the other end is screwed on a fixed plate 3.6 fixed on the frame 3.1, so that the slider bearing seat 3.5 can be moved along the oblique direction of the frame 3.1 by adjusting the adjusting screw 3.7, thus achieving Tensioning action on the conveyor belt 3.2;

Through the above device, two tempering effects on the steel balls are realized. The steel balls first enter the lower chain conveyor belt 1.3 in the lower bracket 1.1 for one tempering, and then are transported to the steel ball strong by the high temperature resistant steel ball lifting conveyor 3. The convection cooling device 2 is used for cooling, and the cooled steel balls are lifted by the high-temperature-resistant steel ball lifting conveyor 3 to the upper chain conveyor belt 1.4 in the upper bracket 1.2 of the double-layer tempering device 1 for secondary tempering (tempering) During operation, use the waste heat pipe system 4 to heat the steel ball), through the secondary tempering, it helps to improve the metallographic structure of the steel ball, so that it has better toughness and the best overall strength; and the waste heat can be used to Tempering treatment has positive energy saving and emission reduction benefits, that is, the high temperature tail gas of the previous process is treated and reused, saving a lot of heat energy and effectively reducing the production cost of the enterprise;

In addition, it should be noted that the above-mentioned specific implementation is only an optimization solution of this patent, and any changes or improvements made by those skilled in the art based on the above-mentioned device under the technical inspiration of this patent are included in this patent. within the scope of patent protection.

Claims (8)

1. A steel ball compound waste heat tempering device, characterized in that the device includes a double-layer tempering device (1), a steel ball strong convection cooling device (2), and a high temperature resistant steel ball lifting conveyor (3) and the waste heat pipe system (4), the high-temperature-resistant steel ball lifting conveyor (3) is provided with two sets, one is located at the discharge end of the double-layer tempering device (1) and the steel ball strong convection cooling device (2) between the feed end of the steel ball strong convection cooling device (2) and the feed end of the double-layer tempering device (1). 2. A steel ball composite waste heat tempering device according to claim 1, characterized in that: the double-layer tempering device (1) includes a lower bracket (1.1) and an upper layer installed above the lower bracket (1.1) The bracket (1.2), the lower bracket (1.1) and the upper bracket (1.2) are respectively horizontally installed with a lower chain conveyor belt (1.3) and an upper chain conveyor belt (1.4), and the waste heat pipe system (4) is installed On the lower bracket (1.1) and the upper bracket (1.2), the waste heat pipe system (4) includes a waste heat input pipe (4.1), an upper waste heat pipe (4.2) and a lower waste heat pipe (4.3), and the waste heat input One end of the pipe (4.1) is connected to the waste heat source, and the other end is connected to the upper waste heat pipe (4.2) and the lower waste heat pipe (4.3), which are respectively installed on the upper bracket ( 1.2) and the lower support (1.1), and the upper waste heat pipe (4.2) and the lower waste heat pipe (4.3) are horizontally connected with multiple branch pipes (4.4), and the above branch pipes (4.4) are respectively located on the lower chain conveyor belt (1.3 ) and below the upper chain conveyor belt (1.4); multiple slits (4.5) are opened on the branch pipes (4.4). 3. A steel ball composite waste heat tempering device according to claim 2, characterized in that: the upper bracket (1.2) and the lower bracket (1.1) are closed structures, and the upper bracket (1.2) and the lower bracket ( 1.1) The right and left ends are provided with a material inlet and a material outlet, and an exhaust gas hood is installed at the left end of the material outlet. 4. A steel ball compound waste heat tempering device as claimed in claim 1, characterized in that: the steel ball strong convection cooling device (2) includes a bracket (2.1), and the bracket (2.1) is installed with a transport to be cooled The steel ball conveyor belt, the left and right ends of the support (2.1) are provided with inlet and outlet (2.2), the upper part of the front and rear side walls of the support (2.1) is provided with a sealing plate (2.3) for sealing, and the lower part forms an air inlet (2.4), the top of the bracket (2.1) is equipped with a cone-shaped windshield (2.5), and the top of the windshield (2.5) is connected to a fan through an air induction pipe (2.6). 5. A steel ball compound waste heat tempering device according to claim 1, characterized in that: the high temperature resistant steel ball lifting conveyor (3) includes a frame (3.1) arranged obliquely, and the frame (3.1) is provided with a conveyor belt (3.2) arranged obliquely, and the above-mentioned conveyor belt (3.2) is driven by a drive shaft (3.3) located on the upper part of the frame (3.1) arranged obliquely, and the above-mentioned conveyor belt (3.2) ) is supported by the driven shaft (3.4) located on the lower part of the frame (3.1) arranged obliquely. 6. A steel ball compound waste heat tempering device according to claim 5, characterized in that: the above-mentioned driven shaft (3.4) is sleeved on the slider bearing seat (3.5) through a bearing, and the slider bearing seat (3.5) Slidingly connected to the above frame (3.1). 7. A steel ball compound waste heat tempering device according to claim 6, characterized in that: the slider bearing seat (3.5) is fixed with a slider embedded in the chute on the frame (3.1), And one end of an adjusting screw (3.7) is screwed on the slider bearing seat (3.5), and the other end is screwed on a fixed plate (3.6) fixed on the frame (3.1). 8. A steel ball compound waste heat tempering device as claimed in claim 5, characterized in that: said conveyor belt (3.2) includes a chain mechanism arranged symmetrically on the left and right sides and a connecting plate connected between the chain structures , the above-mentioned chain structure includes end-to-end chain plates (3.2.1), end-to-end connecting lugs (3.2.3), and links between chain plates (3.2.1) and connecting lugs (3.2.3). between the rollers (3.2.2), the connecting plate includes a U-shaped plate (3.2.4) and an L-shaped plate (3.2.5) arranged at intervals in sequence, and the U-shaped plate (3.2.4) and the L-shaped plate The left and right ends of the plate (3.2.5) are respectively fixed on the connecting ear plates (3.2.3) located on the left and right sides, and the U-shaped plate (3.2.4) and the L-shaped plate (3.2.5) form a bucket structure.