Lifting appliance for heat treatment of pit furnace

Abstract

The utility model discloses a lifting appliance for heat treatment of a pit furnace, which comprises a base, a pore plate and a lifting rod, and the base is sleeved on the lifting rod; the base comprises a body and at least two loading arms, and one end of each loading arm is connected to the body; bosses are arranged on the two sides of the loading arm; after the pore plate is placed on the boss, the pore plate is tightly matched with the loading arm. The base, the lifting rod and the pore plate can be independently detached, so that the difficulty and convenience of lifting tool replacement are improved and the cost is reduced while the performance requirements of quick and stable positioning of the lifting tool, convenience and easiness in lifting operation and the like are ensured, and the influence on the production efficiency of products due to deformation and cracking of the lifting tool is avoided. The device has high applicability, and meanwhile, the situation that the part is scrapped due to different cooling speeds caused by non-uniform contact between a quenching medium and the part during quenching of the part, so that the construction period is delayed and the cost is wasted can be avoided.

Description

Technical Field

[0001] The utility model relates to a hanger for heat treatment of a pit type furnace, belonging to the technical field of heat treatment of pit type furnaces. Background Art

[0002] Metal heat treatment is a process of heating metal or alloy parts to a suitable temperature in a certain medium, keeping them warm for a period of time, and then cooling them at different speeds in different media to change the surface and internal structure of the material and obtain mechanical properties. Using a pit furnace to perform heat treatment processes such as tempering, normalizing, annealing, nitriding, and carburizing on shaft parts is a common furnace loading method in the field of heat treatment. The advantage of this method is that it maximizes the use of workshop floor space. For long shaft parts, pit loading can also effectively reduce deformation during the heating process.

[0003] When using a pit furnace to heat treat metal materials, it is often necessary to hoist and transport parts. The previous heat treatment hoists had a simple structure and poor bearing capacity, and ordinary steel needed to be replaced regularly. The existing heat treatment hoist devices and parts are repeatedly heat treated. The parts are heavy and the furnace load is large. The hoist devices used in high temperature environments will be scrapped as a whole due to easy deformation and cracking, resulting in huge losses and certain safety risks. Utility Model Content

[0004] The utility model provides a sling for heat treatment of a pit furnace, which solves the technical problem in the prior art that the production cost increases due to the need for overall replacement of the sling due to deformation and cracking.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a hanger for heat treatment of a pit furnace, comprising a base, a perforated plate and a hanger, wherein the base is sleeved on the hanger; the base comprises a main body and at least two loading arms, one end of the loading arm is connected to the main body; bosses are arranged on both sides of the loading arm; after the perforated plate is placed on the boss, the perforated plate is tightly fitted with the loading arm.

[0006] Preferably, there are six loading arms in total, which are radially connected to the body; the bosses of two adjacent loading arms are located in the same plane; the orifice plate is fan-shaped and tightly matched with the loading arms on both sides; after the orifice plate is placed on the boss, the orifice plate and the base are located in the same plane. Providing multiple loading arms and orifice plates facilitates partial replacement and reduces manufacturing difficulty.

[0007] Preferably, the orifice plate is a honeycomb plate, on which hexagonal holes of uniform size are evenly distributed. The honeycomb plate reduces weight while making the quenching medium contact the parts evenly, avoiding inconsistent organization caused by uneven local temperature and affecting product performance.

[0008] Preferably, the loading arms are evenly distributed on the body.

[0009] Preferably, the suspension rod is a hollow structure, and a first cavity connected to the outside is arranged inside, which reduces the weight while meeting the load-bearing requirements; the hollow structure is conducive to the flow of the medium during quenching, releases the pressure of the quenching medium, accelerates the heat exchange of the quenching medium and improves the heat transfer efficiency, and avoids the whole suspension device moving up and down in the quenching medium during quenching, and the medium rises and flows out due to capillary phenomenon.

[0010] Preferably, a groove for hoisting is cut on the upper side of the outer wall of the suspension rod.

[0011] Preferably, a trapezoidal step is provided in the first cavity, and the position of the trapezoidal step is arranged corresponding to the groove. The trapezoidal step forms a trapezoidal thickening treatment in the internal cavity of the suspension rod, thereby improving the overall mechanical properties of the suspension device, avoiding the suspension rod being too thin and having poor bearing capacity due to the opening of the groove, and being easily deformed and scrapped, and at the same time improving safety.

[0012] Preferably, a second cavity is further provided inside the suspension rod; the second cavity is located above the first cavity and is connected to the first cavity; a block is provided inside the second cavity, and a through hole B is provided on the block. The block can improve the strength of the suspension rod lifting part, and the through hole provided on it can ensure the circulation of the quenching medium and prevent the boiling of the medium during quenching from causing excessive pressure, resulting in a large amount of quenching medium being ejected at high speed from the top of the suspension rod.

[0013] Preferably, a positioning step is provided at the bottom of the suspension rod to facilitate quick disassembly, assembly and positioning of the base and the suspension rod.

[0014] Preferably, a mounting hole is provided on the main body, and the mounting hole matches the outer diameter of the suspension rod; a through hole A is provided on the loading arm, which reduces weight while allowing the quenching medium to contact the parts evenly, avoiding inconsistent structures caused by local temperature unevenness and affecting product performance.

[0015] The utility model arranges the base on the suspension rod and places the orifice plate on the boss of the base, and simultaneously adopts a tight fit between the orifice plate and the loading arm of the base, so that the base, the suspension rod and the orifice plate can be disassembled separately. While ensuring the performance requirements of the sling such as quick and stable positioning and convenient and easy hoisting operation, the difficulty and convenience of replacing the sling are improved and the cost is reduced, thereby avoiding the influence of product production efficiency due to deformation and cracking of the sling.

[0016] The utility model adopts the mode of cooperating the orifice plate with the loading arm of the base, which can be applicable to various types of parts and has high applicability. At the same time, it can also avoid the scrapping of parts due to different cooling speeds caused by uneven contact between the quenching medium and the parts during quenching, resulting in delays in construction period and waste of costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A schematic diagram of the structure of a hanger for heat treatment in a pit furnace provided by the utility model;

[0018] Figure 2 It is a structural schematic diagram of the base in the utility model;

[0019] Figure 3 The structural diagram of the utility model is as follows:

[0020] Figure 4 It is a structural schematic diagram of the suspension rod in the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the stopper in the utility model;

[0022] Figure 6 It is a schematic diagram of the hoisting device processing ring parts of the utility model;

[0023] Figure 7 This is a schematic diagram of the utility model's lifting device for handling small parts.

[0024] Among them: 1-base, 101-body, 1011-mounting hole, 102-loading arm, 1021-through hole A, 1022-boss, 2-orifice plate, 3-suspender rod, 301-first cavity, 302-second cavity, 303-groove, 304-trapezoidal step, 305-positioning step, 4-stopper, 401-through hole B, 5-workpiece A, 6-workpiece B. DETAILED DESCRIPTION

[0025] In order to better understand the essence of the present invention, the present invention is further described below in conjunction with specific embodiments and drawings.

[0026] The utility model relates to a hanger for heat treatment of a pit furnace, comprising a base 1, a perforated plate 2 and a hanger 3, wherein the base 1 is sleeved on the hanger 3, and the perforated plate 2 is detachably connected to the base 1. The hanger of the utility model can replace a certain part separately, which is convenient for production and use and reduces loss.

[0027] In some embodiments of the present invention, Figure 2As shown, the base 1 includes a body 101 and at least two loading arms 102, one end of the loading arm 102 is connected to the body 101; bosses 1022 are provided on both sides of the loading arm 102, and the bosses 1022 are used to place the orifice plate 2; the bosses 1022 of two adjacent loading arms 102 are located in the same plane, and after the orifice plate 2 is placed on the bosses 1022, the orifice plate 2 and the base 1 are located in the same plane; a mounting hole 1011 is provided on the body 101, and the mounting hole 1011 matches the outer diameter of the suspension rod 3. As a preferred embodiment of the utility model, a through hole A1021 is provided on the loading arm 102, which reduces weight and makes the quenching medium contact the parts evenly, avoiding inconsistent organization caused by uneven local temperature and affecting product performance.

[0028] As a preferred embodiment of the utility model, there are six loading arms 102, which are evenly distributed on the main body 101. After being connected to the main body 101, the loading arms 102 are radially arranged; the orifice plate 2 is fan-shaped and tightly fits with the loading arms 102 on both sides, so that the base 1 and the orifice plate 2 are tightly fitted and fixed and maintained in the same plane.

[0029] like Figure 3 As shown, the orifice plate 2 is a honeycomb plate on which hexagonal holes of uniform size are evenly distributed, which reduces weight while allowing the quenching medium to contact the parts evenly, avoiding inconsistent structures caused by local temperature unevenness and affecting product performance.

[0030] If the lifting device of the utility model is deformed due to high temperature after being used many times, so that the surface of the orifice plate 2 is uneven, the orifice plate 2 can be replaced separately at any time, thereby shortening the production cycle.

[0031] like Figure 4 and Figure 5 As shown, in some embodiments of the utility model, the suspension rod 3 is a hollow structure, and a first cavity 301 connected to the outside is arranged inside. The suspension rod 3 is a hollow structure, which reduces the weight while meeting the load-bearing requirements; the hollow structure is conducive to the flow of the medium during quenching, releases the pressure of the quenching medium, accelerates the heat exchange of the quenching medium and improves the heat transfer efficiency, and avoids the whole suspension device moving up and down in the quenching medium during quenching, and the medium rises and flows out due to capillary phenomenon.

[0032] As a preferred embodiment of the utility model, the upper part of the outer wall of the suspension rod 3 is cut with a groove 303, which is convenient for hanging and transporting with a hook. A trapezoidal step 304 is arranged in the first cavity 301, and the position of the trapezoidal step 304 is arranged corresponding to the groove 303. The trapezoidal step 304 forms a trapezoidal thickening treatment in the internal cavity of the suspension rod 3, which improves the overall mechanical properties of the suspension device, avoids the suspension rod being too thin and poor in bearing capacity due to the opening of the groove, and is easily deformed and scrapped, and can also improve safety.

[0033] In some embodiments of the utility model, a second cavity 302 is further provided inside the suspension rod 3; the second cavity 302 is located above the first cavity 301 and is connected to the first cavity 301; a block 4 is provided in the second cavity 302, and a through hole B401 is opened on the block 4, and the through holes B401 are evenly distributed on the block 4; the block 4 can improve the strength of the lifting part of the suspension rod 3, and the through holes B401 provided thereon can not only ensure the circulation of the quenching medium, but also avoid the boiling of the medium during quenching to cause excessive pressure, resulting in a large amount of quenching medium being ejected from the top of the suspension rod 3 at high speed.

[0034] In some embodiments of the present invention, a positioning step 305 is provided at the bottom of the suspension rod 3 to facilitate the rapid disassembly, assembly and positioning of the base 1 and the suspension rod 3 .

[0035] When processing ring parts, such as Figure 6 In the workpiece A5 shown in the figure, the base 1 is used alone. The base 1 and the orifice plate 2 are used together, which is suitable for the heat treatment of small parts, including shafts, disks, etc. Figure 7 The workpiece B6 shown in the figure. When processing small parts, just place the parts on the orifice plate 2, level them and fix them. The base 1 and the orifice plate 2 are used together to provide stable support and ensure that the quenching medium is in full contact with the parts.

[0036] It should be noted that although the utility model is described through the above embodiments, the utility model can also have other various embodiments. Without departing from the spirit and scope of the utility model, it is obvious that those skilled in the art can make various corresponding changes and deformations to the utility model, but these changes and deformations should fall within the scope of protection of the attached claims of the utility model and their equivalents.

Claims

1. A hanger for heat treatment in a pit furnace, comprising a base (1), a perforated plate (2) and a hanger rod (3), characterized in that: The base (1) is sleeved on the suspension rod (3); the base (1) comprises a main body (101) and at least two loading arms (102), one end of each loading arm (102) being connected to the main body (101); bosses (1022) are provided on both sides of each loading arm (102); after the orifice plate (2) is placed on the bosses (1022), the orifice plate (2) and the loading arms (102) are tightly matched.

2. The lifting device for heat treatment in a pit furnace according to claim 1, characterized in that: A total of six loading arms (102) are provided, and after the loading arms (102) are connected to the body (101), they are radially arranged; the bosses (1022) of two adjacent loading arms (102) are located in the same plane; the orifice plate (2) is fan-shaped and tightly matched with the loading arms (102) on both sides; after the orifice plate (2) is placed on the bosses (1022), the orifice plate (2) and the base (1) are located in the same plane.

3. The lifting device for heat treatment in a pit furnace according to claim 1 or 2, characterized in that: The perforated plate (2) is a honeycomb plate on which hexagonal holes of uniform size are evenly distributed.

4. The lifting device for heat treatment in a pit furnace according to claim 2, characterized in that: The loading arms (102) are evenly distributed on the body (101).

5. The lifting device for heat treatment in a pit furnace according to claim 1, characterized in that: The suspension rod (3) is a hollow structure, and a first cavity (301) communicating with the outside is arranged inside.

6. The lifting device for heat treatment in a pit furnace according to claim 5, characterized in that: A groove (303) for hoisting is cut on the upper side of the outer wall of the hoisting rod (3).

7. The lifting device for heat treatment in a pit furnace according to claim 6, characterized in that: A trapezoidal step (304) is provided in the first cavity (301), and the position of the trapezoidal step (304) is arranged corresponding to the groove (303).

8. The lifting device for heat treatment in a pit furnace according to claim 5, characterized in that: A second cavity (302) is also provided inside the suspension rod (3); the second cavity (302) is located above the first cavity (301) and is in communication with the first cavity (301); a stopper (4) is provided inside the second cavity (302), and a through hole B (401) is provided on the stopper (4).

9. The lifting device for heat treatment in a pit furnace according to claim 1, characterized in that: A positioning step (305) is provided at the bottom of the suspension rod (3).

10. The lifting device for heat treatment in a pit furnace according to claim 1, characterized in that: The body (101) is provided with a mounting hole (1011), and the mounting hole (1011) matches the outer diameter of the suspension rod (3); and the loading arm (102) is provided with a through hole A (1021).

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