Structure for avoiding nitriding deformation of valve rod
The slender valve stem is suspended through suspension, and gravity and physical support are used to ensure its natural perpendicularity, solving the problem of valve stem bending during nitriding, improving the quality and production efficiency of nitriding, and reducing costs.
Patent Information
- Application Number
- CN202421429471.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-06-21
AI Technical Summary
During the nitriding process, the slender valve stem is prone to bend due to insufficient load verticality, resulting in a decrease in nitriding quality and an increase in production costs.
The valve stem is suspended by hanging, ensuring the valve stem is naturally vertical through wire ropes and connecting structures, and using gravity and physical support to avoid bending.
It effectively avoids the bending phenomenon of the valve stem during the nitriding process, improves the nitriding quality, reduces production costs, and improves production efficiency.
Smart Images
Figure CN222846790U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of nitriding of valve stems, in particular to a structure for preventing valve stems from being deformed by nitriding. Background Art
[0002] The 7X62DF valve stem needs to be nitrided as required. The part has been processed as a whole before nitriding, so the stem must be bent ≤ 0.10mm during the nitriding process. The stem of this part is 245mm long and 12mm in diameter. It is a slender part. If the stem cannot be kept vertical during the nitriding process, it is easy to bend under the influence of high temperature and gravity.
[0003] The commonly used method is to place a chassis at the bottom of the nitriding furnace, and place the bottom of the valve stem flat on the chassis to ensure that the valve stem is perpendicular to the chassis so that the valve stem will not bend. However, this method requires the chassis to be smooth and free of debris. If the chassis finish is not up to standard, the valve stem will tilt. In addition, this method has high requirements for furnace loading operations. The valve stem is not fixed during lifting and loading, which can easily cause hidden dangers such as falling and bumping.
[0004] Therefore, it is necessary to provide a new structure to avoid valve stem nitriding deformation and solve the above technical problems. Utility Model Content
[0005] In order to solve the above technical problems, the utility model provides a structure for preventing valve stem from nitriding deformation.
[0006] The utility model provides a structure for preventing valve stem deformation by nitriding, comprising: a nitriding furnace, a steel wire rope, a connecting structure and an adjusting structure. A valve stem is installed inside the nitriding furnace, a through hole is opened at the top of the valve stem, a crossbeam is fixedly connected to the top of the inner wall of the nitriding furnace, one end of the steel wire rope is installed in the middle of the crossbeam, and the other end is installed on the through hole of the valve stem to suspend the valve stem, a connecting mechanism is installed between the top of the valve stem and the steel wire rope, the connecting structure is used to fix the valve stem, an adjusting structure is installed inside the crossbeam, and the adjusting structure is installed in coordination with the steel wire rope.
[0007] Preferably, the connecting structure includes: a first L-shaped rod, to which the lower end of the steel wire rope is fixedly connected, a slide groove is provided at one end of the first L-shaped rod, a connecting hole is provided at the other end of the first L-shaped rod, a second L-shaped rod is inserted into the through hole, one end of the second L-shaped rod is slidably connected to the slide groove, the other end of the second L-shaped rod is threaded, and the threaded end extends out of the connecting hole and is fixedly connected via a nut.
[0008] Preferably, the adjustment structure includes: a connecting shaft, a connecting shaft rotatably connected inside the crossbeam, an outer wall of the connecting shaft is fixedly connected to one end of the wire rope, one end of the connecting shaft is fixedly connected to a worm gear, a worm is rotatably connected to the worm gear inside the nitriding furnace, and the worm gear is meshingly connected to the worm gear.
[0009] Preferably, a scale line is provided on the outer wall of the nitriding furnace coaxially with the worm wheel, and a pointer is fixedly connected to the axis of the worm wheel.
[0010] Preferably, one end of the worm protrudes out of the nitriding furnace and is provided with a hexagonal groove.
[0011] Preferably, the contact surfaces of the first L-shaped rod and the second L-shaped rod are coated with a high-temperature resistant and wear-resistant coating to reduce the wear of both under long-term high temperature.
[0012] Preferably, a shockproof base is provided at the bottom of the nitriding furnace, and the shockproof base is made of rubber or elastic material to reduce vibration and noise during operation of the nitriding furnace.
[0013] Compared with the related art, the structure for preventing valve stem nitriding deformation provided by the utility model has the following beneficial effects:
[0014] Improved stem nitriding quality: By adopting the suspension method, this technical improvement effectively avoids the stem bending phenomenon caused by insufficient verticality of the loading during the nitriding process. This not only improves the quality of stem nitriding, but also extends the service life of the stem.
[0015] Reduced production costs: The traditional method requires a base to be placed at the bottom of the nitriding furnace, and the base surface must be horizontal and smooth to ensure that the valve stem will not tilt. This technical improvement uses the gravity of the valve stem itself to achieve natural verticality, without the need for additional auxiliary equipment, thereby reducing production costs.
[0016] Improved production efficiency: By adopting the improved nitriding process method of this technology, the valve stem is not easy to tilt or fall during loading and unloading, which reduces the adjustment time of the operator and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 A schematic diagram of the structure for preventing valve stem nitriding deformation provided by the utility model;
[0018] Figure 2 for Figure 1 The structural schematic diagram of the valve stem shown;
[0019] Figure 3 for Figure 1 A schematic diagram of the structure of the connection structure shown;
[0020] Figure 4 for Figure 1 Schematic diagram of the structure of the regulation structure shown.
[0021] Numbers in the figure: 1. nitriding furnace; 2. valve stem; 3. through hole; 4. crossbeam; 5. wire rope; 6. connecting structure; 7. adjusting structure; 8. scale line; 9. pointer; 10. hexagonal groove; 61. first L-shaped rod; 62. slide groove; 63. connecting hole; 64. second L-shaped rod; 71. connecting shaft; 72. worm wheel; 73. worm. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0023] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.
[0024] See also Figures 1 to 4 A structure for preventing valve stem deformation by nitriding, the structure comprising: a nitriding furnace 1, a steel wire rope 5, a connecting structure 6 and an adjusting structure 7. A valve stem 2 is installed inside the nitriding furnace 1, a through hole 3 is opened at the top of the valve stem 2, a crossbeam 4 is fixedly connected to the top of the inner wall of the nitriding furnace 1, one end of the steel wire rope 5 is installed in the middle of the crossbeam 4, and the other end is installed on the through hole 3 of the valve stem 2 to suspend the valve stem 2, a connecting mechanism 6 is installed between the top of the valve stem 2 and the steel wire rope 5, the connecting structure 6 is used to fix the valve stem 2, an adjusting structure 7 is installed inside the crossbeam 4, and the adjusting structure 7 is installed in cooperation with the steel wire rope 5, an anti-vibration base is arranged at the bottom of the nitriding furnace 1, and the anti-vibration base is made of rubber or elastic material to reduce the vibration and noise of the nitriding furnace 1 during operation.
[0025] See also Figure 3 The connection structure 6 includes: a first L-shaped rod 61, the lower end of the steel wire rope 5 is fixedly connected to the first L-shaped rod 61, one end of the first L-shaped rod 61 is provided with a slide groove 62, the other end of the first L-shaped rod 61 is provided with a connecting hole 63, a second L-shaped rod 64 is inserted into the through hole 3, one end of the second L-shaped rod 64 is slidably connected to the slide groove 62, the other end of the second L-shaped rod 64 is threaded, and the threaded end extends out of the connecting hole 63 and is fixedly connected by a nut, and the contact surface of the first L-shaped rod 61 and the second L-shaped rod 64 is coated with a high temperature resistant and wear-resistant coating to reduce the wear of both under long-term high temperature.
[0026] See also Figure 3-4The adjusting structure 7 includes: a connecting shaft 71, a connecting shaft 71 is rotatably connected inside the cross beam 4, an outer wall of the connecting shaft 71 is fixedly connected to one end of the wire rope 5, one end of the connecting shaft 71 is fixedly connected to a worm wheel 72, a worm 73 is rotatably connected to the worm wheel 72 inside the nitriding furnace 1, the worm wheel 72 is meshingly connected to the worm 73, a scale line 8 is provided at the coaxial position of the outer wall of the nitriding furnace 1 and the worm wheel 72, a pointer 9 is fixedly connected to the axis of the worm wheel 72, and one end of the worm 73 extends out of the nitriding furnace 1 and is provided with an inner hexagonal groove 10.
[0027] The working principle of the structure for preventing valve stem nitriding deformation provided by the utility model is as follows:
[0028] The working principle of the structure for avoiding valve stem deformation by nitriding mainly relies on the combination of gravity and physical support. Before nitriding, a small hole with a diameter of 3 mm is first drilled at a distance of 5 mm from the top of the valve stem 2, and this small hole serves as the key point for subsequent lifting of the valve stem.
[0029] When the nitriding furnace is loaded, a specially designed connection structure 6 is used to suspend the valve stem 2. Specifically, one end of the steel wire rope 5 is installed in the middle of the crossbeam 4 at the top of the inner wall of the nitriding furnace 1, and the other end is connected to the through hole 3 of the valve stem 2 through the connection structure 6. The connection structure 6 includes a first L-shaped rod 61 and a second L-shaped rod 64, wherein the first L-shaped rod 61 is fixedly connected to the steel wire rope 5, and the second L-shaped rod 64 is inserted into the through hole 3 of the valve stem 2 and fixed to the first L-shaped rod 61 through the slide groove 62 and the connection hole 63, ensuring that the valve stem 2 is stably suspended.
[0030] During the nitriding process, the weight of the valve stem 2 generates a downward gravity, which naturally keeps the valve stem 2 in a vertical state. At the same time, the stainless steel ring composed of the steel wire rope 5 and the connecting structure 6 and the crossbeam 4 provide a stable physical support point for the valve stem 2. Since stainless steel has good high temperature resistance, the support structure can maintain stability and reliability even in the high temperature environment of the nitriding furnace 1.
[0031] In addition, in order to more accurately control the hanging height and angle of the valve stem 2, an adjustment structure 7 is also designed. By rotating the worm 73, the worm wheel 72 and the connecting shaft 71 can be driven to rotate, and then the length and angle of the wire rope 5 can be adjusted, so as to achieve fine adjustment of the hanging position of the valve stem 2. The scale lines 8 on the outer wall of the nitriding furnace 1 and the pointer 9 at the axis of the worm wheel 72 provide intuitive adjustment instructions.
[0032] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A structure for preventing valve stem deformation by nitriding, characterized in that: include: A nitriding furnace (1) is provided with a valve stem (2) inside, a through hole (3) is provided at the top of the valve stem (2), and a crossbeam (4) is fixedly connected to the top of the inner wall of the nitriding furnace (1); A steel wire rope (5), one end of which is mounted on the middle of the cross beam (4) and the other end of which is mounted on the through hole (3) of the valve stem (2) for suspending the valve stem (2); A connecting structure (6), wherein a connecting structure (6) is installed between the top end of the valve stem (2) and the steel wire rope (5), and the connecting structure (6) is used to fix the valve stem (2); An adjusting structure (7) is installed inside the cross beam (4), and the adjusting structure (7) is installed in coordination with the steel wire rope (5).
2. The structure for preventing valve stem from nitriding deformation according to claim 1, characterized in that: The connection structure (6) comprises: a first L-shaped rod (61), the lower end of the steel wire rope (5) is fixedly connected to the first L-shaped rod (61), one end of the first L-shaped rod (61) is provided with a slide groove (62), the other end of the first L-shaped rod (61) is provided with a connection hole (63), a second L-shaped rod (64) is inserted into the through hole (3), one end of the second L-shaped rod (64) is slidably connected to the slide groove (62), the other end of the second L-shaped rod (64) is threaded, and the threaded end extends out of the connection hole (63) and is fixedly connected via a nut.
3. The structure for preventing valve stem from nitriding deformation according to claim 1, characterized in that: The adjustment structure (7) comprises: a connecting shaft (71), the connecting shaft (71) is rotatably connected inside the crossbeam (4), the outer wall of the connecting shaft (71) is fixedly connected to one end of the steel wire rope (5), one end of the connecting shaft (71) is fixedly connected to a worm gear (72), a worm (73) is rotatably connected to the worm gear (72) inside the nitriding furnace (1), and the worm gear (72) and the worm gear (73) are meshingly connected.
4. The structure for preventing valve stem from nitriding deformation according to claim 3, characterized in that: A scale line (8) is provided on the outer wall of the nitriding furnace (1) and the coaxial position of the worm wheel (72), and a pointer (9) is fixedly connected to the axis of the worm wheel (72).
5. The structure for preventing valve stem from nitriding deformation according to claim 3, characterized in that: One end of the worm (73) protrudes out of the nitriding furnace (1) and is provided with a hexagonal groove (10).
6. The structure for preventing valve stem from nitriding deformation according to claim 2, characterized in that: The contact surfaces of the first L-shaped rod (61) and the second L-shaped rod (64) are coated with a high temperature resistant and wear-resistant coating.
7. The structure for preventing valve stem deformation due to nitriding according to claim 1, characterized in that: The bottom of the nitriding furnace (1) is provided with a shockproof base, which is made of rubber or elastic material.