Nitriding hanger for slender shaft valve core

Abstract

The utility model discloses a slender shaft valve core nitriding hanger which comprises a hanger, a base, a spacer bush I, a shelf I, a spacer bush II, a lifting hook and a bolt, the base, the spacer bush I, the shelf I, the spacer bush II and the shelf II are sequentially sleeved on the hanger, the lifting hook is screwed into the center of the shelf II through threads, and the bolt is inserted into honeycomb holes of the shelf I and the shelf II; the base is of a series of concentric latticed structures; a slender shaft valve element to be nitrided is sequentially screwed into the bolt, then the nitriding hanger is integrally assembled and then placed into a nitriding furnace together for nitriding, and the gas nitriding hanger is suitable for gas nitriding of the slender shaft valve element after finish machining.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hanger of gaseous nitriding part, concretely relates to a slender shaft valve core nitriding hanger. BACKGROUND

[0002] Valve core is a most important key component in hydraulic system, is mainly used to frequently reverse for liquid flow. Valve core needs reciprocating motion in the valve body full of high pressure high temperature liquid oil, requires that the wear amount is small after long -term use, and the sealing is good, and does not leak oil, and does not string oil, and simultaneously, valve core does not occur deformation. In order to guarantee that valve core part is enough organization stability and good wear resistance, high-precision valve core part usually selects high alloy nitriding steel, and after quenching and tempering treatment, after finishing, carries out surface nitriding treatment to obtain good wear resistance, so that the heat treatment of high-precision valve core part should embody the following features: valve core part organization stability (can be obtained by quenching and tempering treatment), nitriding layer is uniform, and the part does not occur deformation. SUMMARY

[0003] In order to solve the above problems, the utility model provides a slender shaft valve core nitriding hanger for gas nitriding of wear-resistant parts after finishing.

[0004] The technical scheme adopted by the utility model is as follows:

[0005] A slender shaft valve core nitriding hanger, including hanger, base, spacer sleeve one, shelf one, spacer sleeve two, shelf two, hook and bolt, the hanger is sequentially sleeved into the base, spacer sleeve one, shelf one, spacer sleeve two and shelf two, the hook is screwed into the center of shelf two through thread, and the bolt is inserted into the honeycomb hole of shelf one and shelf two.

[0006] Further, the hanger is a columnar part, the lower bottom of the hanger is a boss, the hanger is a large shaft part, the large step at the bottom is used to support the base when hoisting as a whole, and the top of the hanger is processed with a threaded hole, which is used to fix and connect the hook.

[0007] Further, the base is a series of concentric grid structures, radial holes for atmosphere circulation are formed in each concentric annular rib, each annular rib is connected through a radial rib, and the central part is a hollow cylindrical structure, a step is formed in the cylindrical body and is used to connect the hanger, the base part can be integrally cast, or can be welded by rib plate and cylindrical part, so that manufacturing is convenient, and the part material is made of stainless steel.

[0008] Further, the spacer sleeve one and the spacer sleeve two are tubular shaft parts, the inner diameter of the spacer sleeve is 5-8mm larger than the diameter of the upper end of the lifting appliance; the length thereof is adjusted according to the length of the valve core part, and the length is 50-80mm longer than the valve core, which on the one hand ensures that the valve core can be smoothly and vertically inserted into the shelf during nitriding, and makes the nitriding atmosphere unobstructed during the nitriding process, and completes the adsorption and desorption of the surface of the part; on the other hand, it ensures that the valve core can be smoothly taken out of the shelf after the nitriding is completed.

[0009] Further, the shelf one and the shelf two are honeycomb ring structure parts, the honeycomb unit structure is a regular hexagonal structure, the center is a cylindrical hollow structure, the cylindrical body and the hexagonal boundary are connected through a small rib plate, the distance between the centers of the regular hexagons is 60-80mm larger than the diameter of the valve core, the regular hexagonal honeycomb units are connected with each other, the edge of the shelf is a ring rib structure, the center of the shelf is also a hollow ring cylinder, the inner diameter of the cylinder is 5-8mm larger than the outer diameter of the upper end of the lifting appliance, which facilitates the smooth fitting of the shelf into the lifting appliance, the shelf is integrally cast, has a plurality of holes, small gas path resistance, and uniform nitriding medium flow, on the one hand, the part is uniformly heated and deformed little, on the other hand, the nitriding medium is fully contacted with the surface of the part, the nitrogen potential in the furnace is uniform, so that the valve core quickly obtains a consistent wear-resistant nitriding layer on the surface.

[0010] Further, the bolt thread diameter is matched with the valve core threaded hole, 45 steel is used for series manufacturing, and the operation is simple, and small-batch production or scientific research trial products can be directly hung by iron wire, that is, the iron wire is wound at the step of the non-nitriding surface, and then the iron wire is bound at the rib plate at each place of the shelf.

[0011] Further, the hook is integrally forged, has high structural strength, and is provided with a threaded surface at the lower end, and the threaded surface is connected with the threaded hole at the upper end of the lifting appliance.

[0012] Further, the ring rib structure of the base and the honeycomb structure of the shelf have high overall strength and high deformation resistance at high temperature, the structure has low heat storage, and unnecessary energy loss is reduced.

[0013] The connection sequence of the hanger is that the base center hole is sleeved into the lifting appliance and placed on the boss at the lower end of the lifting appliance, the spacer sleeve one is sleeved, placed on the base, the shelf is sleeved, the spacer sleeve two is sleeved and placed on the shelf, the threaded hook is screwed in, the bolts are inserted into the honeycomb holes of the shelf in sequence, and the nitriding treatment slender shaft valve core part is screwed into the bolts in sequence. After the nitriding hanger is integrally assembled, it is placed into the nitriding furnace for nitriding treatment.

[0014] The beneficial effects of the utility model lie in:

[0015] The ring rib structure of the base and the honeycomb structure of the shelf of this utility model have high overall strength and high resistance to deformation at high temperature. The structure has low heat storage, which reduces unnecessary energy consumption. The hanger of this utility model is suitable for gas nitriding treatment of slender shaft parts after precision machining, and can also be used for carburizing treatment or medium and high temperature tempering treatment of slender shaft parts. Attached Figure Description

[0016] Figure 1 This is the overall assembly drawing of the hanging fixture of this utility model.

[0017] Figure 2 This is a schematic diagram of the lifting equipment.

[0018] Figure 3 This is a schematic diagram of the base.

[0019] Figure 4 This is a schematic diagram of a spacer.

[0020] Figure 5 This is a schematic diagram of the shelf.

[0021] Figure 6 This is a schematic diagram of a lifting hook.

[0022] Figure 7 This is a schematic diagram of a slender shaft valve core. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings, but the present invention is not limited thereto.

[0024] This utility model includes a lifting device (such as...) Figure 2 As shown), base (as shown) Figure 3 As shown), spacer one (as shown) Figure 4 As shown), shelf one (as shown) Figure 5 As shown), spacer two (as shown) Figure 4 As shown), shelf two (as shown) Figure 5 As shown), hook (such as) Figure 6 As shown in the figure, the base, spacer one, shelf one, spacer two and shelf two are sequentially fitted onto the lifting device. The hook is screwed into the center of shelf two through the thread, and the bolt is inserted into the honeycomb holes of shelf one and shelf one.

[0025] Assembly and process implementation: The base is inserted into the lifting device through the center hole and placed on the boss at the lower end of the lifting device. Spacer 1 is then inserted onto the base, shelf 1 is inserted onto spacer 1, spacer 2 is inserted onto shelf 1, and spacer 2 is inserted onto shelf 2. The hook is then screwed in via threads. Bolts are then inserted sequentially into the honeycomb holes of the shelf. Finally, the slender shaft valve core to be nitrided (such as...) is placed on the shelf. Figure 7 (As shown) Tighten the bolts in sequence. After the nitriding fixture is assembled as a whole (as shown in the overall assembly drawing), Figure 1 (As shown) They are placed together in a nitriding furnace for nitriding treatment.

Claims

1. An elongated shaft valve core nitriding hanger, characterized in that, It includes a lifting tool, a base, a spacer sleeve one, a shelf one, a spacer sleeve two, a shelf two, a lifting hook and a bolt, the lifting tool is sequentially sleeved with the base, the spacer sleeve one, the shelf one, the spacer sleeve two and the shelf two, the lifting hook is screwed into the center of the shelf two through the thread, and the bolt is inserted into the honeycomb hole of the shelf one and the shelf two.

2. The nitriding fixture for an elongated-shaft spool according to claim 1, characterized by, The lifting tool is a columnar part, the lower bottom of the lifting tool is a boss, and a threaded hole is processed at the top of the lifting tool for fixing and connecting the lifting hook.

3. The elongated shaft valve core nitriding hanger of claim 1, wherein, The base is a series of concentric grid structures, each concentric annular rib is provided with a radial hole for atmosphere circulation, each annular rib is connected through a radial rib, and the central part is a hollow cylindrical structure, and a step is processed in the cylindrical body for connection with the lifting tool.

4. The elongated shaft valve core nitriding hanger of claim 1, wherein, The base part is integrally cast, or is welded by a rib plate and a cylindrical part.

5. The nitriding fixture for an elongated-shaft spool according to claim 1, wherein The spacer sleeve one and the spacer sleeve two are tubular shaft parts, and the inner diameter of the spacer sleeve is greater than the diameter of the upper end of the lifting tool by 5-8 mm.

6. The nitriding fixture for an elongated-shaft spool according to claim 1, wherein The length of the spacer sleeve one and the spacer sleeve two is adjusted according to the length of the valve core part, and the length is greater than that of the valve core by 50-80 mm.

7. The nitriding fixture for an elongated-shaft spool according to claim 1, wherein The shelf one and the shelf two are honeycomb annular structure parts, the honeycomb unit structure is a regular hexagonal structure, the center is a cylindrical hollow structure, the cylindrical body and the hexagonal boundary are connected through a small rib plate, the distance between the centers of the regular hexagons is greater than the diameter of the valve core by 60-80 mm, the regular hexagonal honeycomb units are connected with each other, the edge of the shelf is an annular rib structure, the center of the shelf is also a hollow annular cylindrical body, and the inner diameter of the cylindrical body is greater than the outer diameter of the upper end of the lifting tool by 5-8 mm.

8. The elongated shaft valve core nitriding hanger of claim 1, wherein, The bolt thread diameter is matched with the valve core threaded hole, and 45 steel is used for series manufacturing.

9. The nitriding fixture for an elongated-shaft spool according to claim 1, wherein The lifting hook is integrally forged, and the end is provided with a threaded surface connected with the threaded hole at the upper end of the lifting tool.

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