Lifting appliance for steel billet to enter and exit from resistance furnace

Abstract

The utility model belongs to the field of steel rolling mechanical equipment production tools, and relates to a steel billet in-out furnace lifting appliance for a resistance furnace. The balance weight steel billet is of a cuboid structure, the cuboid structure comprises four side faces, a plurality of lifting points are arranged on one side face, and a lifting lug is installed on each lifting point. A through hole is formed in each lifting lug, and the resistance furnace steel billet in-out furnace lifting appliance is lifted through the through holes; a billet loading inlet piece is arranged at one end of the counterweight billet and is used for clamping a to-be-heated billet. According to the resistance furnace steel billet in-out furnace lifting appliance, a steel billet is adopted as a balance weight, a steel plate is used for manufacturing a billet containing inlet piece with the same size as the balance weight steel billet, the billet containing inlet piece is used for clamping a to-be-heated steel billet, the balance weight steel billet and the billet containing inlet piece are fixedly connected, then the to-be-heated steel billet is inserted into the billet containing inlet piece, and according to the length of the to-be-heated steel billet, the to-be-heated steel billet is placed in the billet containing inlet piece; through calculation and analysis, three lifting lugs are fixed at three points of a counterweight steel billet and are used for lifting and balancing the steel billet to be heated.

Description

Technical Field

[0001] The utility model belongs to the field of production tools and tooling for rolling machinery and equipment, and particularly relates to a resistor furnace billet charging and discharging spreader. Background Technique

[0002] A resistor furnace is an industrial furnace that uses an electric current to heat the electric heating elements or heating medium inside the furnace, thereby heating workpieces or materials. It is a heating furnace that generates heat energy by passing an electric current through a resistance material. Resistor furnaces are used in the mechanical industry for preheating metals before forging, heat treatment of metals, brazing, powder metallurgy sintering, roasting and annealing of glass ceramics, melting of low-melting-point metals, drying of sand molds and paint film layers, etc. Industrial resistor furnaces generally consist of electric heating elements, masonry, a metal shell, a furnace door, furnace machinery, and an electrical control system, etc. The heating power ranges from less than one kilowatt to several thousand kilowatts. A furnace with a working temperature below 650 °C is a low-temperature furnace; 650 - 1000 °C is a medium-temperature furnace; and above 1000 °C is a high-temperature furnace. In high-temperature and medium-temperature furnaces, heating mainly occurs by radiation. In low-temperature furnaces, heat transfer occurs by convection. The electric heating elements are installed in the air duct, and the furnace gas is forced to circulate by a blower to enhance convective heat transfer. Resistor furnaces include chamber-type, pit-type, trolley-type, pusher-type, walking-beam type, muffle-type, and tunnel-type, etc. Controlled atmosphere furnaces, vacuum furnaces, fluidized-bed furnaces, etc. are also resistor furnaces. Metal electric heating element materials include nickel-chromium alloys, chromium-aluminum alloys, tungsten, molybdenum, tantalum, etc., and are generally made into spiral wires, corrugated wires, corrugated belts, and corrugated plates. Non-metal electric heating element materials include silicon carbide, molybdenum disilicide, graphite, and carbon, etc., and are generally made into shapes such as rods, tubes, plates, and belts. The distribution and wiring method of the electric heating elements depend on the power of the furnace and the furnace temperature requirements. Compared with flame furnaces, resistor furnaces have the advantages of simple structure, uniform furnace temperature, easy control, good heating quality, no soot, and no noise, but the usage cost is relatively high.

[0003] There is no charging and discharging trolley for the resistor furnace used on-site, and the charging and discharging of billets have become a problem. There is an urgent need for a tool spreader that can load billets into the resistor furnace and quickly remove the heated billets from the furnace chamber. This resistor furnace is mainly used for the production of high-alloy steel. After the billets are heated, they need to be quickly lifted out and sent to a rolling mill for rolling to ensure that the rolling temperature is not lower than 1100 °C. Existing vertical-lifting tongs (a tong is a tool used for clamping, fastening, or lifting, and is widely used in industries such as metallurgy, transportation, railways, ports, etc.) cannot achieve the horizontal entry of billets into the furnace chamber. Using a robotic arm fixture is too costly, and the robotic arm is fixed and cannot move. Content of the Utility Model

[0004] The utility model provides a resistor furnace billet charging and discharging spreader, which solves the problem that there is no charging and discharging trolley for the resistor furnace used on-site and the difficulty in charging and discharging billets.

[0005] To achieve the above object, the present application provides the following technical solutions:

[0006] A lifting device for charging and discharging billets in a resistance furnace, comprising: a counterweight billet; the counterweight billet has a cuboid structure; the cuboid structure includes four side faces; a plurality of lifting points are provided on one of the side faces, and a lifting lug is installed on each lifting point; a perforation is provided in each of the lifting lugs, and the lifting device for charging and discharging billets in the resistance furnace is lifted through the perforation; one end of the counterweight billet is provided with a billet loading inlet part for clamping the billet to be heated.

[0007] Further, in the lifting device for charging and discharging billets in a resistance furnace as described above, the billet loading inlet part has a tubular structure; one end of the tubular structure is sleeved outside the counterweight billet, and the other end is sleeved outside the billet to be heated.

[0008] Further, in the lifting device for charging and discharging billets in a resistance furnace as described above, one end of the billet loading inlet part is fixedly connected to the counterweight billet, and the opening size of the other end matches one end of the billet to be heated, so as to insert the billet to be heated into the billet loading inlet part.

[0009] Further, in the lifting device for charging and discharging billets in a resistance furnace as described above, the lifting lug has an arched structure; the lifting lug is fixedly connected to the counterweight billet.

[0010] Further, in the lifting device for charging and discharging billets in a resistance furnace as described above, the cuboid structure includes two end faces, both of which are square; one end of the counterweight billet and one end of the billet loading inlet part are welded and fixed.

[0011] Further, in the lifting device for charging and discharging billets in a resistance furnace as described above, chamfers are provided at both openings of the billet loading inlet part.

[0012] Further, in the lifting device for charging and discharging billets in a resistance furnace as described above, the chamfer is 45°, and the length range of the right-angled side is 4-6 mm.

[0013] Further, in the lifting device for charging and discharging billets in a resistance furnace as described above, the counterweight billet and the billet to be heated have the same length.

[0014] Further, in the lifting device for charging and discharging billets in a resistance furnace as described above, the horizontal length of the billet loading inlet part is at least 300 mm.

[0015] Further, in the lifting device for charging and discharging billets in a resistance furnace as described above, the lifting lug and the counterweight billet are integrally formed.

[0016] The technical solution of the present utility model has the following beneficial effects:

[0017] The structure of the lifting device for the billet to enter and exit the resistance furnace is simple, with high strength at high temperatures, the workpieces are not easy to fall off, it has a long service life, low cost, is easy to use, and has a wide range of applications. Brief Description of the Drawings

[0018] Figure 1 It is a structural diagram of a lifting device for the billet to enter and exit the resistance furnace of the present utility model.

[0019] Description of the drawing numbers: lifting lug 1, first lifting lug 11, second lifting lug 12, third lifting lug 13, counterweight billet 2, billet loading inlet part 3. Detailed Embodiments

[0020] To make the objectives, technical solutions and advantages of the present utility model clearer, the embodiments of the present utility model will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0021] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, 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 directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0023] Refer to the attached Figure 1 A detailed introduction to a lifting device for the billet to enter and exit the resistance furnace provided by the present utility model will be given.

[0024] Briefly speaking, the basic technical solution of the present utility model is briefly described as follows:

[0025] A lifting device for the billet to enter and exit the resistance furnace includes: a counterweight billet 2;

[0026] The counterweight billet 2 has a cuboid structure, which includes four side faces, and a plurality of lifting points are arranged on one of the side faces, and a lifting lug 1 is installed on each lifting point; a perforation is arranged in each lifting lug 1, and the billet of the resistance furnace is lifted in and out of the furnace through the perforation; a billet loading inlet part 3 is arranged at one end of the counterweight billet 2 for clamping the billet to be heated.

[0027] A billet lifting tool for a resistance furnace provided by the present application uses a billet as a counterweight, and a billet loading inlet part 3 made of a steel plate with the same size as the counterweight billet 2 is used for clamping the billet to be heated. The counterweight billet 2 and the billet loading inlet part 3 are fixedly connected, and then the billet to be heated is inserted into the billet loading inlet part 3. According to the length of the billet to be heated, through calculation and analysis, three lifting lugs 1 are fixed at three points on the counterweight billet 2, which are used for lifting and also play a role in balancing the billet to be heated.

[0028] The following will discuss in detail a billet lifting tool for a resistance furnace provided by the present application, including the lifting lug 1, the counterweight billet 2, and the billet loading inlet part 3 mentioned in the above embodiments.

[0029] As Figure 1 shown, the counterweight billet 2 has a cuboid structure and is used to balance the billet to be heated; the cuboid structure includes two end faces and four side faces. The two end faces are the first end face and the second end face respectively; both the first end face and the second end face are squares; the first end face and the second end face are distributed along the extending direction of the axis of the cuboid structure, and the four side faces are distributed along the circumferential direction of the axis of the cuboid structure.

[0030] A billet loading inlet part 3 is arranged at one end of the counterweight billet 2 for clamping the billet to be heated. The billet loading inlet part 3 has a tubular structure and is open at both ends along the horizontal direction. In a specific embodiment, the vertical cross-section of one end of the billet loading inlet part 3 is a square and matches one end of the counterweight billet 2, and the counterweight billet 2 can be inserted into the billet loading inlet part 3 for balancing the billet to be heated. That is to say, one end of the billet loading inlet part 3 is sleeved outside one end of the counterweight billet 2, and one end of the counterweight billet 2 and one end of the billet loading inlet part 3 are fixedly connected; the billet loading inlet part 3 plays a role in clamping the counterweight billet 2. The billet loading inlet part 3 is made of a steel plate. The length of the tube body of the billet loading inlet part 3 is less than the length of the counterweight billet 2. In a specific embodiment, one end of the counterweight billet 2 is fixedly welded to one end of the billet loading inlet part 3.

[0031] One end of the pipe body structure is fixedly connected to the counterweight billet 2, and the opening size at the other end matches one end of the billet to be heated, so that one end of the billet to be heated can be inserted into the other end of the billet loading inlet part 3. That is to say, the other end of the billet loading inlet part 3 is sleeved outside one end of the billet to be heated, and the billet loading inlet part 3 functions to clamp the billet to be heated. The clamping depth is 150 - 200 mm. That is to say, the depth that the billet to be heated extends into the billet loading inlet part 3 is 150 - 200 mm, such as 150, 160, 170, 180, 190, 200 mm; the depth that the counterweight billet 2 extends into the billet loading inlet part 3 is 150 - 200 mm, such as 150, 160, 170, 180, 190, 200 mm; too long a depth is not conducive to billet ejection, and too short a depth cannot hold the billet. The depth that the billet to be heated extends into the billet loading inlet part 3 and the depth that the counterweight billet 2 extends into the billet loading inlet part 3 can be equal or unequal. To be suitable for the clamping depth and accommodate both the counterweight billet 2 and the billet to be heated at the same time, the horizontal length of the billet loading inlet part 3 is at least 300 mm. In a specific embodiment, the horizontal length of the billet loading inlet part 3 is 400 mm, where the depth that the counterweight billet 2 extends into the billet loading inlet part 3 is 200 mm, and the depth that the billet to be heated extends into the billet loading inlet part 3 is 200 mm. Chamfers are provided at both openings of the billet loading inlet part 3. The chamfers can not only remove burrs, making it beautiful and generous, but also reduce stress concentration, strengthen the strength of the part, and make the assembly more convenient and easy; in a specific embodiment, the chamfer is 45°, and the length range of the right-angle side is 4 - 6 mm, such as C4, C5, C6, and preferably, the chamfer is C5. The length of the billet to be heated is the same as the length of the counterweight billet 2.

[0032] According to the length of the billet to be heated, through calculation and analysis, one or more lifting points are provided on one side (top surface) of the counterweight billet 2 to satisfy the balanced lifting of the billet loading and unloading sling of this resistance furnace. There are multiple lifting points, such as 2 or 3. The lifting points are fixed at different distances in the middle of the counterweight billet 2, and the working state can be switched. Preferably, 3 lifting points are provided on the top surface of the billet, and by using different lifting points, the billet loading and unloading sling of this resistance furnace can clamp the billet to be heated for balanced lifting. A lifting lug 1 is installed at each lifting point. Specifically, the lifting lug 1 is fixedly connected to the counterweight billet 2. The lifting lug 1 can be welded and fixed on the top surface of the counterweight billet 2, or the lifting lug 1 is integrally formed with the counterweight billet 2. The lifting lug 1 has an arched structure, and a perforation is provided in the lifting lug 1. Through the perforation, the billet loading and unloading sling of this resistance furnace is lifted to realize the entry and exit of the billet to be heated into and out of the resistance furnace. Preferably, the perforation is a round hole.

[0033] In a specific embodiment, the lifting lugs 1 include a first lifting lug 11, a second lifting lug 12 and a third lifting lug 13. The first lifting lug 11, the second lifting lug 12 and the third lifting lug 13 are arranged in sequence along the axis line of the counterweight billet 2 from the first end face to the second end face. The distance from the first lifting lug 11 to the first end face of the counterweight billet 2 is set as L1, the distance from the second lifting lug 12 to the first lifting lug 11 is set as L2, the distance from the third lifting lug 13 to the second lifting lug 12 is set as L3, and the distance from the third lifting lug 13 to the second end face of the counterweight billet 2 is set as L4. The crane maintains the balance of the charging and discharging fixture for the resistance furnace billet (with the billet to be heated) by using different lifting lugs 1. In a specific embodiment, the second lifting lug 12 is the center point of the counterweight billet 2, and the lengths of L1, L2, L3 and L4 are equal.

[0034] During use, first align the billet loading inlet part 3 with the end of the billet to be heated and push it in, so that the billet to be heated is inserted into the billet loading inlet part 3 with the counterweight billet 2. Then use the hook of the crane to lift the second lifting lug 12. The charging and discharging fixture for the resistance furnace billet is suspended on the hook. Place the billet to be heated on the refractory bricks of the resistance furnace. The billet to be heated is in a suspended state, and the charging and discharging fixture for the resistance furnace billet directly exits the resistance furnace. Then the resistance furnace heats the billet to be heated. After heating is completed, the billet to be heated becomes the heated billet. Align the billet loading inlet part 3 with the end of the heated billet in the resistance furnace and push it in, so that the billet loading inlet part 3 clamps the heated billet; the hook of the crane separately lifts the second lifting lug 12 to facilitate the billet loading inlet part 3 to clamp the heated billet. A support is arranged under the other end (the end far from the billet loading inlet part 3) of the counterweight billet 2 to facilitate the switching of the hook. Switch the hook to the first lifting lug 11 and the second lifting lug 12 (two lifting points) to balance the counterweight billet 2 and the heated billet; lift the heated billet out of the resistance furnace and transport it to the rolling mill roller table. Then switch the hook to the first lifting point and the third lifting point (two lifting points) to facilitate the separation of the heated billet and the charging and discharging fixture for the resistance furnace billet. Take the heated billet out of the charging and discharging fixture for the resistance furnace billet, and lift the charging and discharging fixture for the resistance furnace billet away smoothly.

[0035] The present application provides a charging and discharging fixture for a resistance furnace billet. The fixture has a simple structure, high strength at high temperature, the workpiece is not easy to fall off, long service life, low cost, convenient use and wide application range.

[0036] For those skilled in the art, the present utility model can be implemented through other embodiments that do not depart from its spiritual essence or essential features. Obviously, the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present utility model. Therefore, from any point of view, it is only an illustration and not the only one. The embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved. All changes within the scope of the present utility model or within the scope equivalent to the present utility model are included in the present utility model.

Claims

1. A steel billet loading and unloading hanger for a resistance furnace, characterized in that: include: Counterweight billets; The counterweight steel billet is in a rectangular parallelepiped structure; The cuboid structure includes four sides; A plurality of lifting points are arranged on one of the side surfaces, and a lifting lug is installed on each lifting point; Each of the lifting ears is provided with a through hole, through which the resistance furnace steel billet is lifted and taken in and out of the furnace by the lifting device; One end of the counterweight steel billet is provided with a billet loading inlet for clamping the steel billet to be heated.

2. The resistance furnace billet loading and unloading hanger according to claim 1, characterized in that: The blank loading inlet is in the form of a tube structure; One end of the tube structure is sleeved on the outside of the counterweight steel billet, and the other end is sleeved on the outside of the steel billet to be heated.

3. The resistance furnace billet loading and unloading hanger according to claim 1, characterized in that: One end of the billet loading inlet is fixedly connected to the counterweight billet, and the opening size of the other end matches one end of the billet to be heated, so that the billet to be heated can be inserted into the billet loading inlet.

4. The resistance furnace billet loading and unloading hanger according to claim 1, characterized in that: The lifting lug is in an arched structure; The lifting lug is fixedly connected to the counterweight steel billet.

5. The resistance furnace billet loading and unloading hanger according to claim 2, characterized in that: The cuboid structure includes two end faces, both of which are square; One end of the counterweight steel billet and one end of the billet loading inlet piece are welded and fixed.

6. The resistance furnace billet loading and unloading hanger according to claim 1, characterized in that: Both end openings of the blank loading inlet are chamfered.

7. The resistance furnace billet loading and unloading hanger according to claim 6, characterized in that: The chamfer is 45°, and the length of the right angle side is in the range of 4-6 mm.

8. The resistance furnace billet loading and unloading hanger according to claim 1, characterized in that: The counterweight steel billet and the steel billet to be heated have the same length.

9. The resistance furnace billet loading and unloading hanger according to claim 1, characterized in that: The horizontal length of the blank loading inlet is at least 300 mm.

10. The resistance furnace billet loading and unloading hanger according to claim 1, characterized in that: The lifting lug is integrally formed with the counterweight steel billet.

Images