Hydrogen flow guide anti-blocking device for sintering furnace
By using the interlaced arrangement structure of the tungsten strip mesh in the sintering furnace, the problem of blockage of hydrogen inlet is solved, uniform sintering and efficient production of rods are achieved, and labor intensity and processing costs are reduced.
Patent Information
- Application Number
- CN202421681481.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-16
AI Technical Summary
In the sintering furnace, the hydrogen inlet is easily blocked by impurity volatiles, resulting in unstable hydrogen flow and pressure, affecting the sintering quality. The prior art has solved the problem through regular cleaning but increased labor intensity and processing costs.
The N-layer tungsten strip mesh frame built with tungsten strips is used to divert hydrogen, prevent impurities from clogging the hydrogen inlet, and ensure a uniform sintering atmosphere. The specific structure of the tungsten strip mesh frame includes the staggered arrangement and angle design of multi-layer tungsten strips.
The uniform sintering of rods is achieved, the sintering quality is improved, the labor intensity is reduced, the device service life is extended, and the operating efficiency of the sintering furnace is improved.
Smart Images
Figure CN223138359U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sintering furnaces, in particular to a device for guiding and preventing hydrogen from blocking in a sintering furnace. Background Art
[0002] When producing tungsten rods, the bar blanks that have been pressed by cold isostatic pressing need to be sintered at high temperature. Hydrogen is introduced into the sintering furnace, so that the bar blanks go through three stages of volatilization, crystallization, and densification to obtain rods with uniform grain structure. During the sintering process, the impurities in the bar blanks are volatilized at high temperature, and the volatiles will fall to the bottom of the sintering furnace, which may block the hydrogen inlet at the bottom and affect the introduction of hydrogen. Once the flow and pressure of hydrogen cannot be guaranteed, the sintering atmosphere in the sintering furnace will be affected, and the sintered body will be sintered unevenly, resulting in quality defects such as low density and uniform crystallization of the sintered body. What is more serious is that the sintered body is not completely sintered, resulting in a quality accident of pulverization of the sintered body. If a quality accident of the sintered body occurs in the sintering furnace, the loss will be considerable. Therefore, during the production process, it is necessary to try to avoid quality accidents caused by blockage of the hydrogen inlet or uneven distribution of hydrogen.
[0003] At present, many sintering furnace manufacturers usually solve the above problem by regular cleaning (for example, cleaning once every sintering), but this increases the workload of employees. And if a blockage occurs during the sintering process, it cannot be cleaned and the sintering can only be stopped, which invisibly increases the processing cost. Utility Model Content
[0004] The utility model aims to provide a device for guiding and preventing hydrogen blockage in a sintering furnace, so as to at least partially solve the problems existing in the prior art.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A device for guiding hydrogen flow and preventing blockage in a sintering furnace is a tungsten bar grid with N layers of tungsten bars arranged in an alternating manner, wherein N is a positive integer greater than or equal to 4.
[0007] Preferably, the N-layer tungsten bar grid is, from bottom to top, the first layer in which the tungsten bars are arranged radially along the center of the circle, the second layer in which the tungsten bars are arranged in parallel, the third layer in which the tungsten bars are arranged in parallel and interlaced with the tungsten bars of the second layer, and the Nth layer in which the tungsten bars are arranged in parallel and interlaced with the tungsten bars of the N-1th layer.
[0008] Preferably, from the second layer to the Nth layer, the included angle between the tungsten bars of two adjacent layers is 30-90°.
[0009] Preferably, from the 2nd layer to the Nth layer, a long tungsten bar is placed in the middle of each layer, and short tungsten bars are placed on both sides to match the shape of the first layer.
[0010] Preferably, the included angle between adjacent tungsten bars in the first layer is 10 to 30°.
[0011] Preferably, the tungsten bars in the second layer are arranged side by side, and the distance between adjacent tungsten bars is 0 mm.
[0012] Preferably, the distance between adjacent tungsten bars in the third layer to the (N - 1)th layer is 10 to 20 mm.
[0013] Preferably, the distance between adjacent tungsten bars in the Nth layer is 1 to 2 mm.
[0014] The beneficial effects of the present utility model are as follows:
[0015] The present utility model discloses a device for preventing hydrogen flow blockage in a sintering furnace. It is a tungsten bar grid formed by arranging N layers of tungsten bars in a staggered manner. It has the functions of guiding hydrogen and preventing impurity volatiles from blocking the hydrogen inlet, ensuring a uniform sintering atmosphere during the sintering process of the bar, and the sintered bar has a uniform density and a uniform crystal structure; it has the characteristics of high temperature resistance, stability, and not being easily deformed, and has a long service life; there is no need to clean each furnace, which greatly reduces the labor intensity and improves the efficiency of the sintering furnace operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.
[0017] Figure 1 It is a schematic structural diagram of the device for preventing hydrogen flow blockage in a sintering furnace of the present utility model.
[0018] Figure 2 It is an exploded schematic diagram of the device for preventing hydrogen flow blockage in a sintering furnace of the present utility model.
[0019] Figure 3 It is a schematic structural diagram of the device for preventing hydrogen flow blockage in a sintering furnace of the present utility model placed in a sintering furnace.
[0020] Figure 4 It is a top view of the device for preventing hydrogen flow blockage in a sintering furnace of the present utility model placed in a sintering furnace.
[0021] In the figure: 1 - tungsten bar, 2 - sintering furnace.
[0022] The realization of the object, functional characteristics, and advantages of the present utility model will be further described in combination with the embodiments and with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] The technical solutions in the embodiments will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0024] To better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.
[0025] An embodiment of the present invention discloses a device for preventing hydrogen flow blockage in a sintering furnace, which is a tungsten bar grid formed by arranging N layers of tungsten bars 1 in a staggered manner, and N is a positive integer greater than or equal to 4. As shown in the appended Figures 1-4 figure, the device for preventing hydrogen flow blockage in the sintering furnace 2 is a tungsten bar grid formed by arranging 5 layers of tungsten bars 1 in a staggered manner. The tungsten bars have the characteristics of regular shape and high purity. The built grid is firm and will not bring secondary impurities.
[0026] Preferably, the device for preventing hydrogen flow blockage in the sintering furnace is built in the sintering furnace 2. The N-layer tungsten bar grid is, from bottom to top, the first layer where the tungsten bars 1 are arranged radially around the center, the second layer where the tungsten bars 1 are arranged in parallel, the third layer where the tungsten bars 1 are arranged in parallel and staggered with the tungsten bars 1 in the second layer, and the Nth layer where the tungsten bars 1 are arranged in parallel and staggered with the tungsten bars 1 in the (N - 1)th layer.
[0027] Preferably, from the second layer to the Nth layer, the included angle between adjacent tungsten bars 1 is 30 to 90°. Further preferably, the included angle between adjacent tungsten bars 1 is 90°.
[0028] Preferably, from the second layer to the Nth layer, long tungsten bars are placed in the middle of each layer, and short tungsten bars are placed on both sides to match the shape of the first layer.
[0029] Preferably, the included angle between adjacent tungsten bars in the first layer is 10 to 30°.
[0030] Preferably, the tungsten bars 1 in the second layer are placed side by side, and the distance between adjacent tungsten bars 1 is 0 mm; it can completely cover the hydrogen inlet, which can not only disperse hydrogen but also prevent sundries from falling in and blocking the hydrogen inlet.
[0031] Preferably, the distance between adjacent tungsten bars 1 from the third layer to the (N - 1)th layer is 10 to 20 mm.
[0032] Preferably, the distance between adjacent tungsten bars 1 in the Nth layer is 1 to 2 mm.
[0033] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.
[0034] Example 1
[0035] 1# The sintering furnace uses the tungsten bar grid of the present utility model to sinter pure tungsten bars, and the pure tungsten bars are placed on the tungsten bar grid for sintering. The bottom cleaning period is once every 7 furnaces, and the tungsten bars in the front, back, left, and right 4 sintering zones of the sintered pure tungsten bars are taken respectively, and the measured densities are 17.98 g / cm 3 , 17.90 g / cm 3 , 17.93 g / cm 3 , 17.96 g / cm 3 ; At the same time, the upper and lower ends of the pure tungsten bars in these 4 sintering zones are respectively taken to measure the density. The upper and lower end densities of the tungsten bars in the front sintering zone are 17.97 g / cm 3 and 17.99 g / cm 3 , the upper and lower end densities of the tungsten bars in the rear sintering zone are 17.93 g / cm 3 and 17.91 g / cm 3 , the upper and lower end densities of the tungsten bars in the left sintering zone are 17.94 g / cm 3 and 17.92 g / cm 3 , the upper and lower end densities of the tungsten bars in the right sintering zone are 17.97 g / cm 3 and 17.96 g / cm 3 . Then, the middle cross-sections of these 4 tungsten bars are taken respectively for grain number detection. The grain numbers of the tungsten bars in the front, back, left, and right are 2450, 2390, 2410, and 2470 respectively.
[0036] Example 2
[0037] 2# The sintering furnace uses the tungsten bar grid of the present utility model to sinter rare earth tungsten bars, and the pure tungsten bars are placed on the tungsten bar grid for sintering. The bottom cleaning period is once every 5 furnaces, and the rare earth tungsten bars in the front, back, left, and right 4 sintering zones of the sintered pure tungsten bars are taken respectively. The measured densities of the rare earth tungsten bars in the front, back, left, and right zones are 18.68 g / cm 3 , 18.68 g / cm 3 , 18.64 g / cm 3 , 18.60 g / cm 3 ; At the same time, the upper and lower ends of the rare earth tungsten bars in these 4 sintering zones are respectively taken to measure the density. The upper and lower end densities of the rare earth tungsten bars in the front sintering zone are 18.69 g / cm 3 and 18.67 g / cm 3 , the upper and lower end densities of the rare earth tungsten bars in the rear sintering zone are 18.65 g / cm 3 and 18.68 g / cm 3 , the upper and lower end densities of the rare earth tungsten bars in the left sintering zone are 18.63 g / cm 3and 18.64 g / cm 3 , the densities of the upper and lower ends of the rare earth tungsten rods in the right sintering area are 18.58 g / cm 3 and 18.61 g / cm 3 . Then, take the middle sections of these 4 rare earth tungsten rods respectively for grain number detection. The grain numbers of the rare earth tungsten rods in the front, back, left, and right are 3250, 3300, 3280, and 3200 respectively.
[0038] Comparative Example 1
[0039] Sintering furnace 1 uses simple cushion sintering of pure tungsten rods. The bottom cleaning cycle is 1 time per furnace, and the pure tungsten rods sintered are taken from the tungsten bars in the front, back, left, and right 4 sintering areas respectively. The measured densities are 17.78 g / cm 3 , 17.45 g / cm 3 , 17.39 g / cm 3 , 17.99 g / cm 3 ; at the same time, the upper and lower ends of the pure tungsten rods in these 4 sintering areas are taken to measure the density. The densities of the upper and lower ends of the tungsten rods in the front sintering area are 17.91 g / cm 3 and 17.60 g / cm 3 , the densities of the upper and lower ends of the tungsten rods in the back sintering area are 17.53 g / cm 3 and 17.39 g / cm 3 , the densities of the upper and lower ends of the tungsten bars in the left sintering area are 17.45 g / cm 3 and 17.31 g / cm 3 , the densities of the upper and lower ends of the tungsten rods in the right sintering area are 18.01 g / cm 3 and 17.81 g / cm 3 . Then, take the middle sections of these 4 tungsten rods respectively for grain number detection. The grain numbers of the tungsten rods in the front, back, left, and right are 2560, 2290, 2100, and 2630 respectively.
[0040] Comparative Example 2
[0041] Sintering furnace 2 uses simple cushion sintering of rare earth tungsten rods. The bottom cleaning cycle is 1 time per furnace, and the pure tungsten rods sintered are taken from the rare earth tungsten rods in the front, back, left, and right 4 sintering areas respectively. The measured densities of the rare earth tungsten rods in the front, back, left, and right areas are 18.73 g / cm 3 , 18.44 g / cm 3 , 18.55 g / cm 3 , 18.75 g / cm 3 ; at the same time, the upper and lower ends of the rare earth tungsten rods in these 4 sintering areas are taken to measure the density. The densities of the upper and lower ends of the rare earth tungsten rods in the front sintering area are 18.75 g / cm 3 and 18.61 g / cm 3, the upper and lower end densities of the rare earth tungsten rod in the post-sintering area are 18.56 g / cm 3 and 18.40 g / cm 3 , the upper and lower end densities of the rare earth tungsten rod in the left sintering area are 18.60 g / cm 3 and 18.52 g / cm 3 , the upper and lower end densities of the rare earth tungsten rod in the right sintering area are 18.77 g / cm 3 and 18.64 g / cm 3 . Then, take the middle sections of these 4 rare earth tungsten rods respectively for grain number detection. The grain numbers of the rare earth tungsten rods in the front, back, left, and right are 3350, 2800, 2830, and 3450 respectively.
[0042] The device for preventing hydrogen blockage in the hydrogen diversion of the sintering furnace of the present utility model has the functions of diverting hydrogen and preventing impurity volatiles from blocking the hydrogen inlet, ensuring a uniform sintering atmosphere during the sintering process of the rod, and the sintered rod has uniform density and uniform crystal structure; it has the characteristics of high temperature resistance, stability, and not being easily deformed, and has a long service life; it does not need to be cleaned for each furnace, greatly reducing the labor intensity and improving the efficiency of the sintering furnace operation.
[0043] The above is only the preferred specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent replacements or changes, and should be covered by the protection scope of the present utility model.
Claims
1. A device for preventing hydrogen flow blockage in a sintering furnace, characterized in that, It is a tungsten bar grid with N layers of tungsten bars arranged in a staggered manner using tungsten bars, where N is a positive integer greater than or equal to 4.
2. The device for preventing hydrogen gas flow blockage in a sintering furnace according to claim 1, characterized in that The N-layer tungsten bar grid from bottom to top is successively the first layer with tungsten bars arranged radially along the center of the circle, the second layer with tungsten bars arranged parallel, the third layer with tungsten bars arranged parallel and staggered with the tungsten bars in the second layer, and the Nth layer with tungsten bars arranged parallel and staggered with the tungsten bars in the (N - 1)th layer.
3. The device for preventing hydrogen gas flow blockage in a sintering furnace according to claim 2, characterized in that, From the second layer to the Nth layer, the included angle between the tungsten bars of adjacent layers is 30 to 90°.
4. The device for preventing hydrogen gas diversion blockage in a sintering furnace according to claim 2, characterized in that, From the second layer to the Nth layer, long tungsten bars are placed in the middle of each layer, and short tungsten bars are placed on both sides to match the shape of the first layer.
5. The device for preventing hydrogen gas flow blockage in a sintering furnace according to claim 2, characterized in that, The included angle between adjacent tungsten bars in the first layer is 10 to 30°.
6. The device for preventing hydrogen gas diversion blockage in a sintering furnace according to claim 2, characterized in that, The tungsten bars in the second layer are placed side by side, and the distance between adjacent tungsten bars is 0 mm.
7. The device for preventing hydrogen gas flow blockage in a sintering furnace according to claim 2, characterized in that, The distance between adjacent tungsten bars in the third layer to the (N - 1)th layer is 10 to 20 mm.
8. The device for preventing hydrogen gas flow blockage in a sintering furnace according to claim 2, characterized in that, The distance between adjacent tungsten bars in the Nth layer is 1 to 2 mm.