Shaft product heat treatment lifting appliance

Abstract

The utility model relates to the field of lifting appliance equipment in a heat treatment environment, in particular to a shaft product heat treatment lifting appliance which comprises a lifting appliance body, a through hole is formed in the lifting appliance body, a plurality of stages of convex edges are integrally formed on the inner wall of the through hole, and the diameters of the convex edges are different; clamping pieces which are adaptive to the convex edges with different diameters and are used for clamping and fixing the shaft products are embedded into the through holes, and the lifting appliance body is provided with a lifting hole in the large end side of the through hole. According to the utility model, the shaft products do not need to be drilled, so that the shaft products are not damaged, the utilization rate of the shaft products is ensured, and the shaft products can be prevented from falling off in the hoisting process.

Description

Technical Field

[0001] The utility model relates to the field of sling equipment in a heat treatment environment, in particular to a sling for heat treatment of shaft products. Background Art

[0002] Pit-type furnaces are cyclically operated furnaces suitable for heat treatment of rods and long shafts. Pit-type furnaces feature a cylindrical, deep well, into which workpieces are loaded vertically by a dedicated crane for heating. Depending on the application requirements, pit-type furnaces can be categorized into three types: high-temperature, medium-temperature, and low-temperature. High-temperature pit-type furnaces can reach a maximum temperature of 1200°C, while medium-temperature pit-type furnaces typically reach a maximum temperature of around 950°C and low-temperature pit-type furnaces around 650°C.

[0003] Heat treatment is a metal thermal processing process that heats, holds, and cools materials in a solid state to achieve the desired microstructure and properties. Heat treatment often requires a loading and unloading mechanism to lift the workpiece. Sometimes, the lifting fixture must be repeatedly heated and cooled in a furnace (20-1000°C), which can easily cause deformation and even cracking.

[0004] Currently, to meet technical and safety requirements during heat treatment of shaft products, a hole needs to be drilled on the shaft product as a lifting hole, which reduces product utilization. Alternatively, a D-ring needs to be welded on the shaft product as a lifting hole. However, the D-ring is limited by the product weight, and welding affects product quality, and there is a risk of it falling during heat treatment. Utility Model Content

[0005] The utility model is intended to provide a heat treatment hanger for shaft products to solve the problems of low product utilization caused by drilling holes during heat treatment of existing shaft products, or affecting product quality and posing a risk of falling due to welding additional D-rings.

[0006] The heat treatment hanger for shaft products in this solution includes the hanger body;

[0007] A through hole is formed in the body of the sling, and a plurality of convex edges are integrally formed on the inner wall of the through hole, and the diameters of the convex edges are all unequal;

[0008] A clamping piece adapted to convex edges of different diameters and used for clamping and fixing shaft products is embedded in the through hole, and a lifting hole is provided on the large end side of the through hole of the sling body.

[0009] The beneficial effects of this program are:

[0010] Before heat treating shaft products, insert them into the through-holes of the hoist body, secure them with the clamps, and lift them using the lifting holes. This eliminates the need for drilling holes in the shaft, protects the shaft from damage, and ensures its utilization and prevents it from falling during lifting.

[0011] Preferably, in order to place the clamping parts for fixing the shaft products, the convex edge includes a large edge and a small edge, the diameter of the large edge is 200-500mm, the diameter of the small edge is 20-100mm larger than the outer diameter of the shaft product, and the distance between the large edge and the small edge is 50-300mm.

[0012] Preferably, in order for the clamping member to clamp the shaft product for tightening and limiting, and to stably fix the shaft product, the clamping member includes a semicircular key that can be inserted into the slot on the shaft product, and the semicircular key rests on the small edge.

[0013] Preferably, in order to firmly limit the overall position of the shaft product, the clamping part also includes a clamping plate that can be placed on the large edge, a positioning sleeve is pressed between the clamping plate and the semicircular key, and a plurality of bolt assemblies are connected to the clamping plate, which pass through the large edge and extend out of the sling body.

[0014] Preferably, in order to clamp the shaft products evenly, two semicircular clamping keys are provided and can form a circular ring.

[0015] Preferably, in order to evenly clamp the shaft product, the inner diameter of the semicircular key is the same as the outer diameter of the slot on the shaft product, and the outer diameter of the semicircular key is the same as the inner diameter of the small edge.

[0016] Preferably, in order to stably clamp the semicircular key, the inner diameter of the positioning sleeve is the same as the outer diameter of the shaft product, there is a gap between the outer diameter of the positioning sleeve and the inner diameter of the small edge, and the length of the positioning sleeve is the distance between the clamping plate and the semicircular key when the clamping plate clamps the semicircular key.

[0017] Preferably, in order to allow the pressing plate to press the semicircular key and the positioning sleeve, the bolt assembly passes through the large edge toward the small edge and out of the sling body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an axial cross-sectional view of an embodiment of the heat treatment hanger for shaft products of the utility model;

[0019] Figure 2 This is a front view of an embodiment of the heat treatment hanger for shaft products of the utility model;

[0020] Figure 3 This is a top view of the semicircular key in the embodiment of the heat treatment hanger for shaft products of the utility model. DETAILED DESCRIPTION

[0021] The following is further explained in detail through specific implementation methods.

[0022] The reference numerals in the drawings of the specification include: workpiece 1, clamping bolt 2, clamping nut 3, hanger body 4, semicircular key 5, positioning sleeve 6, clamping plate 7, lifting hole 8, slot 9, large edge 10, small edge 11.

[0023] Example

[0024] Heat treatment hangers for shaft products, such as Figure 1 、 Figure 2 and Figure 3 As shown: it includes a sling body 4, which can be a cylinder, a square cylinder, or other shapes that can be inserted into the pit furnace.

[0025] The sling body 4 has a through-hole extending along its central axis. The inner wall of the through-hole is integrally formed with several levels of ridges, each with unequal diameters. The ridges are arranged in two stages: a large ridge 10 and a small ridge 11. The diameter of the large ridge 10 ranges from 200-500mm, while the diameter of the small ridge 11 is 20-100mm larger than the outer diameter of the shaft product. The spacing between the large ridge 10 and the small ridge 11 ranges from 50-300mm, representing the distance between the end faces of the large ridge 10 and the small ridge 11. The diameters of the large ridge 10 and the small ridge 11, as well as the spacing between them, are determined based on the shaft product being processed.

[0026] A clamping piece adapted to convex edges of different diameters and used to clamp and fix shaft products is embedded in the through hole. A lifting hole is opened on the large end side of the through hole of the sling body 4, and the diameter of the lifting hole is set according to actual needs.

[0027] The clamping member includes a semicircular key 5 that can be inserted into the slot 9 on the shaft product. To prevent deformation of the tooling during heat treatment, the semicircular key 5 is made of heat-resistant stainless steel to ensure repeated use. The slot 9 on the shaft product is formed by pre-forging or metal processing. Since only 5-20mm of the outer diameter is processed, it does not affect the use of the forging body. Long shaft workpieces have a corresponding processing allowance, and the end size of long shaft workpieces is usually slightly smaller than the body. Compared with the conventional end-opening hoisting method, the pre-processing slot 9 method damages the workpiece 1 body. The additional sawing process is required from the opening after heat treatment to the end of the forging to cut off the workpiece, making it impossible to use normally. The slot 9 in this solution only damages a small portion of the outer diameter of the workpiece 1. This solution can be used for other purposes without sawing off the end of the workpiece 1, thereby improving the workpiece utilization rate of shaft products. The semicircular key 5 rests on the small edge 11. Two semicircular keys 5 are provided and can form a ring to fit into the slot 9 of the product.

[0028] The inner diameter of the semicircular key 5 is the same as the outer diameter of the slot 9 on the shaft product, and the outer diameter of the semicircular key 5 is the same as the inner diameter of the small edge 11.

[0029] The clamping member also includes a pressure plate 7 that can be placed on the large edge 10. A circular locating sleeve 6 is pressed between the pressure plate 7 and the semicircular key 5. There is a gap between the inner diameter of the locating sleeve 6 and the outer diameter of the shaft product, and there is a gap between the outer diameter of the locating sleeve 6 and the inner diameter of the small edge 11. The specific size of the gap is set based on the principle of convenient use. The length of the locating sleeve 6 is the distance between the pressure plate 7 and the semicircular key 5 when the pressure plate 7 is pressed against the semicircular key 5.

[0030] The clamping plate 7 is connected to a plurality of bolt assemblies that pass through the large edge 10 and extend out of the sling body 4. Six bolt assemblies are provided. The bolt assemblies include a clamping bolt 2 and a clamping nut 3. The bolt assembly passes through the large edge 10 toward the side of the small edge 11 and extends out of the sling body 4. The inner diameter of the positioning sleeve 6 is larger than the inner diameter of the semicircular key 5.

[0031] The specific implementation process is as follows:

[0032] When in use, first put the sling body 4 on the workpiece 1, which is a shaft product, and Figure 1 Move the sling body 4 to the left end to expose the slot 9 on the workpiece 1; install the two semicircular card keys 5 in the slot 9 on the workpiece 1, and keep the semicircular card keys 5 located in the small edge 11; Figure 1 Move the sling body 4 to the rightmost end until it encloses the semicircular key 5 and cannot be moved. Install the positioning sleeve 6 on the right side of the semicircular key 5. Install the clamping plate 7 on the side of the large edge 10. Then, use the clamping bolt 2 and the clamping nut 3 to firmly connect the clamping plate 7 and the sling body 4. Use the lifting holes 8 on the sling body 4 to connect through the semicircular key 5 to lift the workpiece 1 for heat treatment.

[0033] After the heat treatment, it is only necessary to remove the clamping bolt 2 and the clamping nut 3, and then remove the positioning sleeve 6 and the clamping plate 7 one by one; move the spreader body 4 to the left to expose and take out the semicircular key 5, and the spreader body 4 can be easily removed.

[0034] The sling body 4 of this embodiment can stably fix the workpiece 1 and prevent the sling body 4 from falling off during the lifting process.

[0035] The above is only an embodiment of the present invention, and the commonly known specific structures and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A heat treatment hanger for shaft products, comprising a hanger body; characterized in that: A through hole is formed in the body of the sling, and a plurality of convex edges are integrally formed on the inner wall of the through hole, and the diameters of the convex edges are all unequal; A clamping piece adapted to convex edges of different diameters and used to clamp and fix shaft products is embedded in the through hole, and a lifting hole is opened on the large end side of the through hole of the sling body; The convex edge includes a large edge and a small edge, the clamping part includes a semicircular key that can be inserted into the groove on the shaft product, the semicircular key is pressed against the small edge, and the clamping part also includes a clamping plate that can be placed on the large edge, a positioning sleeve is pressed between the clamping plate and the semicircular key, and a plurality of bolt assemblies that pass through the large edge and extend out of the sling body are connected to the clamping plate.

2. The heat treatment hanger for shaft products according to claim 1, characterized in that: The diameter of the large edge is 200-500 mm, the diameter of the small edge is 20-100 mm larger than the outer diameter of the shaft product, and the distance between the large edge and the small edge is 50-300 mm.

3. The heat treatment hanger for shaft products according to claim 1, characterized in that: Two semicircular keys are provided and can form a circular ring.

4. The heat treatment hanger for shaft products according to claim 3, characterized in that: The inner diameter of the semicircular key is the same as the outer diameter of the slot on the shaft product, and the outer diameter of the semicircular key is the same as the inner diameter of the small edge.

5. The heat treatment hanger for shaft products according to claim 1, characterized in that: There is a gap between the inner diameter of the positioning sleeve and the outer diameter of the shaft product, and there is a gap between the outer diameter of the positioning sleeve and the inner diameter of the small edge. The length of the positioning sleeve is the distance between the clamping plate and the semicircular key when the clamping plate clamps the semicircular key.

6. The heat treatment hanger for shaft products according to claim 1, characterized in that: The bolt assembly passes through the large edge toward the small edge and out of the sling body.

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