Heat preservation furnace cover with different numbers of riser tubes and heat preservation furnace

Abstract

The utility model relates to the technical field of low-pressure casting, in particular to a holding furnace cover with different numbers of riser tubes and a holding furnace, which comprises a bottom main cover plate, a plurality of riser tube openings are arranged on the bottom main cover plate, each riser tube opening is connected with a flange cover, a blanking cap is arranged on the flange opening of each flange cover, and a pressing sealing structure is arranged on each blanking cap. The device is used for pressing and sealing the blanking cap. The multiple riser tube openings are formed in the bottom main cover plate, the flange covers and the blocking covers are arranged, the installation requirements of different numbers of riser tubes can be met, replacement corresponding to different numbers of riser tubes is achieved by adjusting the positions of the blocking covers, the heat preservation cover body does not need to be replaced, operation is easy, efficiency is high, consumed force is small, and meanwhile the cost is low. And the operation safety is better. The problems that in the prior art, a heat preservation furnace cover is large in replacement operation difficulty, long in consumed time and low in production efficiency are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to low pressure casting technical field, concretely to a different quantity of liquid lifting pipe heat preservation furnace cover and heat preservation furnace. BACKGROUND

[0002] Low pressure casting is a kind of from bottom to top anti-gravity casting mode, and metal liquid is made into casting mold through gas pressure difference by liquid lifting pipe, and the casting mold is generally placed on the sealed furnace body. The main structure of low pressure furnace body generally includes hearth, heating part and furnace cover and the like. Sealing is generally through the close cooperation of furnace cover and furnace body. In the low pressure casting process, the tonnage of aluminum alloy castings is generally between a few kilograms and a few tons, and the size is from a few centimeters to a few meters, so when designing the process, one, two or even more liquid lifting pipe openings are designed for multi-gating feeding to better ensure that the temperature of aluminum liquid meets the feeding capacity. In order to adapt to different product processes, one, two or three liquid lifting pipe furnace covers are repeatedly replaced. At the same time, the mold is generally replaced once every 1 to 2 days during the production stage, and the replacement of the mold is also accompanied by the problem of replacing the liquid lifting pipe of different quantities. Generally, the liquid lifting pipe is from one to two to three, and in the prior art, because different quantities of liquid lifting pipe openings correspond to different heat preservation furnace covers, the heat preservation furnace cover containing different liquid lifting pipe openings needs to be replaced when the liquid lifting pipe is replaced. The liquid lifting pipe furnace cover needs to have good sealing performance to prevent leakage of metal liquid and mixing of gas during casting. The sealing performance directly affects the quality and production efficiency of the castings.

[0003] The Chinese utility model patent with the authorized publication number CN209502941U discloses a double liquid lifting pipe low pressure casting sealing furnace cover, which comprises a furnace cover body, the furnace cover body is provided with a liquid lifting pipe opening, and the liquid lifting pipe opening is at least two, and the material of the furnace cover body is heat-resistant nodular cast iron material. The utility model satisfies the double liquid lifting pipe simultaneous pouring process, is suitable for pouring large aluminum castings, especially when the surface area of the aluminum castings is greater than 30000cm², can improve the casting process performance, reduce casting defects, and meet the product technical requirements. However, the furnace cover is only suitable for the sealing furnace cover of two liquid lifting pipes, and in actual production, the corresponding furnace cover needs to be replaced according to the number of liquid lifting pipes. Because the size and quality of the heat preservation furnace cover are relatively large, the sealing gasket is prone to air leakage points. When workers replace it, not only do they need to assemble and disassemble the furnace cover, but also they need to repeatedly debug the heat preservation furnace cover to ensure the sealing performance of the heat preservation cover periphery. The time required for replacing the furnace cover may even be a shift time, but there are still problems of poor sealing after replacement, high operation difficulty, long time consumption, low production efficiency and poor replacement safety. UTILITY MODEL CONTENTS

[0004] In view of the problems of high operation difficulty, long time consumption and low production efficiency of the heat preservation furnace cover replacement in the prior art, the utility model provides a different quantity of liquid lifting pipe heat preservation furnace cover and heat preservation furnace.

[0005] To achieve the above object, the utility model discloses the following technical scheme to realize:

[0006] The utility model provides a different quantity liquid lifting pipe heat preservation furnace cover, including bottom main cover plate, be provided with a plurality of liquid lifting pipe mouth on the bottom main cover plate, every liquid lifting pipe mouth is provided with flange cover, the flange cover is connected with bottom main cover plate, the flange mouth of flange cover is set up correspondingly liquid lifting pipe mouth, is provided with the stopper on the flange mouth, be provided with the compression sealing structure on the stopper, is used for the compression sealing of stopper.

[0007] Further, the compression sealing structure includes a compression plate provided on the stopper, and the compression plate is connected with the bottom main cover plate through fixing bolts at both ends thereof across the stopper.

[0008] Further, a jackscrew is provided on the compression plate for jacking the stopper.

[0009] Further, a flange compression ring is provided between the flange cover and the stopper.

[0010] Further, a sealing gasket is provided between the flange compression ring and the stopper.

[0011] Preferably, the sealing gasket is a silicate cotton sealing gasket.

[0012] Preferably, a stone wool pad is provided between the bottom main cover plate and the flange cover.

[0013] Preferably, the number of liquid lifting pipe mouths is three, and the diameter of the flange cover corresponding to the middle liquid lifting pipe mouth is smaller than the diameter of the flange cover corresponding to the liquid lifting pipe mouths at both ends.

[0014] A heat preservation furnace includes a low-pressure furnace chamber, a liquid lifting pipe, and the different quantity liquid lifting pipe heat preservation furnace cover described above, the heat preservation furnace cover is arranged on the low-pressure furnace chamber, and the liquid lifting pipe extends to the inside of the low-pressure furnace chamber through the liquid lifting pipe mouth on the heat preservation furnace cover.

[0015] Further, a liquid lifting pipe mouth heating sleeve is provided on the liquid lifting pipe.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model discloses a different quantity liquid lifting pipe heat preservation furnace cover. Including bottom main cover plate, be provided with a plurality of liquid lifting pipe mouth on bottom main cover plate, every liquid lifting pipe mouth is connected with flange cover, be provided with the stopper on the flange mouth of flange cover, be provided with the compression seal structure on the stopper, for the compression seal of stopper. Through setting up a plurality of liquid lifting pipe mouth on bottom main cover plate, and through the setting of flange cover and stopper, can satisfy the installation requirement of different quantity liquid lifting pipe, through adjusting the position of stopper, realize the replacement of corresponding different quantity liquid lifting pipe process, need not replace heat preservation cover main part, simple operation, high efficiency, less power consumption, simultaneously, the operation safety is better.

[0018] The compression seal structure includes a compression plate provided on the stopper, and the two ends of the compression plate are connected with the bottom main cover plate through fixing bolts respectively across the stopper. The compression plate is extruded to realize the compression seal of the stopper. The structure is simple, and the casting cost and processing cost are low.

[0019] A jackscrew is arranged on the compression plate to tightly press the stopper, so that the sealing tightness of the stopper is further improved.

[0020] A flange compression ring is arranged between the flange cover and the stopper to realize the effective sealing between the flange cover and the stopper.

[0021] A sealing gasket is arranged between the flange compression ring and the stopper to further improve the sealing performance of the heat preservation cover and ensure the casting process quality.

[0022] The sealing gasket is a silicate cotton sealing gasket. The silicate cotton sealing gasket has excellent high-temperature resistance, and the use temperature range is wide. For example, the use temperature of some aluminum silicate sealing gaskets can reach 800-1600 DEG C, and the fire resistance temperature can reach 1000-1400 DEG C. Therefore, the silicate cotton sealing gasket can still maintain the stability of structure and performance in a high-temperature environment, and still has necessary sealing performance under high-temperature conditions.

[0023] An asbestos gasket is arranged between the bottom main cover plate and the flange cover. The asbestos gasket has high density, good heat insulation performance, high temperature resistance, and good sealing effect.

[0024] The number of the liquid lifting pipe mouths is three, and the diameter of the flange cover corresponding to the middle liquid lifting pipe is smaller than the diameter of the flange cover corresponding to the liquid lifting pipes at both ends. The heat preservation furnace can meet the application requirements of the liquid lifting pipe heat preservation furnace with general quantity, and has good versatility.

[0025] The utility model discloses still provide a kind of heat preservation furnace, including low-pressure hearth, liquid lifting pipe and above-mentioned different quantity liquid lifting pipe heat preservation furnace cover, the heat preservation furnace cover is set on low-pressure hearth, the liquid lifting pipe passes through the liquid lifting pipe of heat preservation furnace cover and extends to low-pressure hearth inside.This heat preservation furnace has better heat preservation performance, high heating efficiency, good reliability, and high processing efficiency.

[0026] The liquid lifting pipe is provided with a liquid lifting pipe opening heating sleeve, the heating sleeve can ensure that the liquid lifting pipe opening is uniformly heated, avoids liquid flow not smooth or equipment damage caused by local overheating or uneven temperature, and through heating the liquid lifting pipe opening, the viscosity of the liquid can be reduced, the flowability of the liquid is improved, so that the liquid can smoothly pass through the liquid lifting pipe, and the operation efficiency of the equipment is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic view of a different number of liquid lifting pipe heat preservation furnace covers of the utility model.

[0028] Figure 2 It is a partial sectional view of a different number of liquid lifting pipe heat preservation furnace covers of the utility model.

[0029] Figure 3 It is a heat preservation furnace structure schematic view of the utility model comprising different number of liquid lifting pipe heat preservation furnace covers.

[0030] Wherein, 1 is a low-pressure furnace, 2 is a heat preservation furnace cover, 3 is a liquid lifting pipe opening heating sleeve, 4 is a liquid lifting pipe, 21 is a bottom main cover plate, 22 is a flange cover, 23 is a plug cover, 24 is a pressing plate, 25 is a fixed bolt, 26 is a jackscrew, 27 is a flange pressing ring, and 28 is a sealing gasket. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0033] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0034] In the description of the embodiments of the utility model, it needs to be explained that, if the terms "upper", "lower", "horizontal", "inner" and the like indicate the position or location relationship based on the position or location relationship shown in the drawings, or the position or location relationship of the utility model product when it is usually placed, it is only for the convenience of describing the utility model and simplifying the description, and it does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0036] In the description of the embodiments of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] The utility model will be further described in detail below in combination with specific embodiments, which is an explanation of the utility model rather than a limitation.

[0038] The utility model discloses a different quantity of liquid lifting pipe heat preservation furnace cover, refer to Figure 1 And Figure 2 , including with the bottom main cover plate 21 of low pressure hearth 1 detachable connection, the bottom main cover plate 21 is provided with several liquid lifting pipe orifices, each liquid lifting pipe orifice is provided with flange cover 22, the flange cover 22 is connected with the bottom main cover plate 21, the flange mouth on the flange cover 22 is set up correspondingly, and the flange mouth is provided with the plug cover 23 on the flange mouth; The plug cover 23 is provided with a compression sealing structure for compressing and sealing the plug cover 23.

[0039] Embodiment 1

[0040] Referring to Figure 1 And Figure 2The utility model discloses a different quantity liquid lifting pipe heat preservation furnace cover, including with the bottom main cover plate 21 of detachable connection of low pressure hearth 1, be provided with 3 liquid lifting pipe mouths on the bottom main cover plate 21, and in 3 liquid lifting, the diameter of the flange cover 22 corresponding setting of the liquid lifting mouth in the middle is less than the diameter of the flange cover 22 corresponding setting of the liquid lifting mouth at both ends, the asbestos pad and the flange cover 22 are sequentially provided at every liquid lifting pipe mouth, the flange mouth of flange cover 22 is welded with flange compression ring 27, the flange compression ring 27 is sealed and is installed with the stopper 23 in, be equipped with sealing washer 28 between the stopper 23 and flange compression ring 27, the outside of stopper 23 is provided with compression plate 24, the both ends of compression plate 24 cross stopper 23 respectively through fixed bolt 25 and are connected with bottom main cover plate 21, be provided with the top silk 26 on compression plate 24, for tamping stopper 23, preferably, sealing washer 28 is silicate asbestos sealing washer.

[0041] Example 2

[0042] Referring to Figure 1 and Figure 2 The utility model provides a different quantity liquid lifting pipe heat preservation furnace cover, including bottom main cover plate 21, the bottom main cover plate 21 is passed along the bolt of bottom main cover plate 21 setting and is on low pressure hearth 1, the outer edge of bottom main cover plate 21 is welded sealing with the furnace body top of low pressure hearth 1, the bottom main cover plate 1 is oval structure, is equipped with three liquid lifting pipe mouths on bottom main cover plate 1,

[0043] Still include flange cover 22, stopper 23, compression plate 24, fixed bolt 25, top silk 26, flange compression ring 27 and sealing washer 28,

[0044] The flange cover 22 is set up in the liquid lifting mouth, and the diameter of the flange cover 22 in the middle is less than the diameter of the flange cover 22 on both sides, the fixed bolt 25 is fixed along the flange cover 22 on the bottom main cover plate 21, so that the interval between the two fixed bolts 25 of adjacent compression position is equal. Every flange cover 22 is uniformly distributed 6 through holes, is connected with bottom main cover plate 21 through bolt, and asbestos pad is clamped between bottom main cover plate 21 and flange cover 22. The flange compression ring 27 is annular structure, and is welded at the flange mouth of flange cover 22, and the welding seam is welded sealing in place without gas leakage. The stopper 23 is circular step structure, and is installed on the flange compression ring 27, and the circular ring silicate asbestos sealing washer 28 is installed between the flange compression ring 27 and the stopper 23, the long strip compression plate 24 is installed above the stopper 23, and the through hole matched with the fixed bolt 25 is respectively arranged in the both ends of compression plate 24, and the compression plate 24 is fixed on the fixed bolt 25 through nut, and the threaded hole is arranged in the middle of compression plate 24, the top silk 26 is installed in the threaded hole, for tamping stopper 23.

[0045] When in use: after the bottom main cover plate 21 is fixed on the low-pressure furnace chamber 1, according to the specific production task and the number of mold liquid lifting pipes, the number and position of the specific mold corresponding to the liquid lifting pipe are determined, if one liquid lifting pipe is used, the middle plug cover 23 is opened, the plug cover 23 is pressed by the pressing plate 24 through the cooperation of the jackscrew 26, and the sealing of the liquid lifting pipe port on both sides is realized; if two liquid lifting pipes are used, the plug cover 23 on both sides is opened, the plug cover 23 in the middle position is pressed by the pressing plate 24 cooperating with the jackscrew, and the sealing of the liquid lifting pipe port in the middle is realized; if three liquid lifting pipes are used, all the plug covers 23 are opened, and the liquid lifting pipes can be inserted into the furnace chamber; the rest of the installation number of liquid lifting pipe positions are similar. Before pouring after installation and adjustment, the low-pressure furnace equipment needs to be tested, and the corresponding pressure pouring parameters are used to verify the parameters and sealing performance after the liquid lifting pipe port is sealed, so as to prevent the casting from being scrapped due to parameter and air leakage problems. Preferably, the main material of the liquid lifting pipe heat preservation furnace cover is nodular cast iron material QT450-10, which is made by casting blank and mechanical processing, and other steel materials can also be used for mechanical processing.

[0046] It should be noted that the liquid lifting pipe heat preservation furnace cover can be applied to different numbers of liquid lifting pipe heat preservation furnace covers, and is not limited to replacement of three or fewer liquid lifting pipes. More numbers of liquid lifting pipe ports can be set according to actual needs to realize replacement of different numbers of liquid lifting pipes.

[0047] Through the setting of the liquid lifting pipe heat preservation furnace cover, the replacement efficiency is obviously improved, and the replacement time of three hours or even one shift is shortened to at most 10 minutes, so that the replacement efficiency is effectively improved, and more manpower is saved. By welding and sealing the bottom main cover plate and the top of the low-pressure furnace chamber 1, the air leakage of the contact surface is eliminated. The installation mode of the heat preservation furnace cover is improved, and the safety of operation and installation is improved.

[0048] Referring to Figure 3 The utility model provides a kind of heat preservation furnace, including low-pressure furnace chamber 1, liquid lifting pipe 4 and above different number of liquid lifting pipe heat preservation furnace cover 2, the heat preservation furnace cover 2 is set on low-pressure furnace chamber 1, the liquid lifting pipe 4 extends to low-pressure furnace chamber 1 inside by passing through the liquid lifting port on heat preservation furnace cover 2;Liquid lifting pipe port heating jacket 3 is provided on the liquid lifting pipe 4.The heat preservation furnace has better heat preservation performance, high heating efficiency, good reliability, and high processing efficiency.

[0049] In summary, the utility model provides a different quantity liquid -lifting tube heat -preserving furnace cover and heat -preserving furnace, through setting up several liquid -lifting tube mouths on bottom main cover plate 1, and through the setting of flange cover 22 and plug cover 23, can satisfy the installation requirement of different quantity liquid -lifting tube, through adjusting plug cover 23 position, realize the replacement of corresponding different quantity liquid -lifting tube process, need not to change heat -preserving cover main part, simple operation, high efficiency, less power consumption, simultaneously, the operation safety is better.

[0050] The above merely describes the preferred embodiments of the utility model, and does not use to make any limitation on the technical scheme of the utility model, and those skilled in the art should understand that the technical scheme can be simply modified and replaced without departing from the spirit and principle of the utility model, and these modifications and replacements also all belong to the protection scope covered by the claims.

Claims

1. A furnace cover with a different number of riser pipes, characterized in that, Includes a bottom main cover plate (21), on which a plurality of liquid riser ports are provided, each of which is provided with a flange cover (22), the flange cover (22) is connected to the bottom main cover plate (21), the flange opening on the flange cover (22) is provided corresponding to the liquid riser port, and a plug (23) is provided on the flange opening; the plug (23) is provided with a compression sealing structure for compression sealing of the plug (23).

2. The insulated furnace cover with different numbers of riser pipes according to claim 1, characterized in that, The compression sealing structure includes a compression plate (24) set on the plug (23), and the two ends of the compression plate (24) are connected to the bottom main cover plate (21) by fixing bolts (25) across the plug (23).

3. The insulated furnace cover with different numbers of riser pipes according to claim 2, characterized in that, The clamping plate (24) is provided with a set screw (26) for clamping the plug (23).

4. The insulated furnace cover with different numbers of riser pipes according to claim 1, characterized in that, A flange clamping ring (27) is provided between the flange cover (22) and the plug (23).

5. The insulated furnace cover with different numbers of riser pipes according to claim 4, characterized in that, A sealing gasket (28) is provided between the flange clamping ring (27) and the plug (23).

6. The insulated furnace cover with different numbers of riser pipes according to claim 5, characterized in that, The sealing gasket (28) is a silica cotton sealing gasket.

7. The insulated furnace cover with different numbers of riser pipes according to claim 1, characterized in that, An asbestos gasket is provided between the bottom main cover plate (21) and the flange cover (22).

8. The insulated furnace cover with different numbers of riser pipes according to claim 1, characterized in that, The number of riser ports is set to 3, and the diameter of the flange cover (22) corresponding to the middle riser port is smaller than the diameter of the flange cover (22) corresponding to the risers at both ends.

9. A heat-preserving furnace, characterized in that, It includes a low-pressure furnace chamber (1), a riser pipe (4), and a heat-insulating furnace cover (2) with a different number of riser pipes as described in any one of claims 1-8, wherein the heat-insulating furnace cover (2) is disposed on the low-pressure furnace chamber (1), and the riser pipe (4) extends through the riser port on the heat-insulating furnace cover (2) into the interior of the low-pressure furnace chamber (1).

10. The heat-preserving furnace according to claim 9, characterized in that, A heating sleeve (3) for the inlet of the riser pipe (4) is provided on the riser pipe (4).

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