A core casting mold

Abstract

The utility model discloses a kind of core pouring mould, including mould groove and comb tooth separator, the notch of mould groove is upwards, multiple tooth gaps are uniformly distributed on comb tooth separator, comb tooth separator is used to be placed in mould groove vertically, and mould groove is divided into multiple groove chambers, and any two adjacent groove chambers are communicated by tooth gap between them.This time, when grout is poured into any one groove chamber, grout will flow in remaining groove chamber under the action of gravity, and finally make the grout thickness in each groove chamber consistent, after preliminary solidification of lower grout, grout can continue to be poured into any one groove chamber, grout continues to flow in remaining groove chamber at this time, and finally solidify, and similarly, forming body with multilayer structure can be formed, and the strength of forming body is smaller at the position of comb tooth separator separation, at this time, external force can be applied to forming body to make it break at the position of smaller strength to form multiple test pieces with more consistent interlayer parameters.

Description

Technical Field

[0001] This utility model belongs to the field of casting molds, and in particular relates to a core casting mold for simulating geological structures. Background Technology

[0002] In oil and gas exploration and geological engineering research, the acquisition and analysis of natural cores are crucial for reservoir evaluation and development planning. However, the acquisition of natural cores faces many technical bottlenecks. Traditional drilling coring (such as rotary coring and percussion coring) is prone to core breakage in hard formations (such as shale and tight sandstone), affecting the core recovery rate; after the core is extracted from the high-pressure underground environment, secondary microfractures are generated due to stress unloading, affecting the results of mechanical performance tests; and the process is costly and time-consuming.

[0003] The demand for artificial rock cores is currently rising. The preparation of artificial rock cores requires casting molds. Traditional molds typically involve first injecting a uniformly mixed slurry into the mold's cavity, where gravity provides initial filling. This is followed by static curing, where the mold is placed in a well-ventilated environment at room temperature for natural curing. Once the material has completed its hydration reaction and reached initial strength, a specimen is obtained. Demolding is then performed mechanically or manually to obtain the final product. However, this traditional casting process is prone to adhesion between the slurry and the mold's inner wall, resulting in strong interfacial bonding between the specimen and the mold. This interfacial interaction makes complete demolding of the cured specimen difficult, often requiring external mechanical intervention (such as hammering or scraping) for forced separation. Such demolding methods are not only cumbersome and time-consuming, but also cause mechanical damage to the specimen surface, affecting the product's dimensional accuracy and mechanical property consistency.

[0004] In addition, when conducting core specimen experiments, multiple parallel tests are usually required. This requires multiple specimens with consistent material parameters between layers as test samples. However, existing molds can only produce one specimen at a time. When producing multiple specimens, there is a possibility that the specimen parameters will deviate due to inaccurate control of the amount of slurry, which will also affect the accuracy of the parallel test results. Utility Model Content

[0005] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a rock core casting mold with simple structure, convenient assembly, and capable of casting multiple layers of rock cores with consistent material parameters at the same time.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: a core casting mold includes a mold groove and a comb-tooth separator. The groove opening of the mold groove faces upward, and the comb-tooth separator has multiple teeth evenly distributed on it. The comb-tooth separator is used to be placed vertically in the mold groove and to divide the mold groove into multiple chambers. Any two adjacent chambers are connected through the teeth between them.

[0007] The beneficial effects of the above technical solution are as follows: by placing comb-tooth separators in the mold groove, when slurry is poured into any one of the grooves, the slurry will flow into the other grooves under the action of gravity and through the tooth gaps, and eventually make the slurry thickness in each groove uniform. After the lower layer of slurry has initially solidified, slurry can continue to be poured into any one of the grooves. At this time, the slurry continues to flow into the other grooves and eventually solidifies. By analogy, a multi-layered molded body can be formed. The strength of the molded body is relatively small at the position where the comb-tooth separators are separated. At this time, an external force can be applied to the molded body to break it at the point of lower strength, so as to form multiple specimens with relatively consistent interlayer parameters.

[0008] The mold groove described in the above technical solution is a polygonal groove, a circular groove, or an elliptical groove.

[0009] The beneficial effect of the above technical solution is that the shape of the mold groove can be selected according to the needs of the specimen shape.

[0010] The mold groove described in the above technical solution includes a bottom plate and a side enclosure. The side enclosure is cylindrical and has open ends at both the top and bottom. The bottom plate is detachably and sealed at the bottom end of the side enclosure.

[0011] The beneficial effect of the above technical solution is that the bottom plate and the side panel can be separated after the molded body is formed, which also helps the molded body to be separated from the mold groove.

[0012] The side enclosure described in the above technical solution includes multiple side panels, all of which are vertically arranged and connected end to end to form a cylindrical shape.

[0013] The advantages of the above technical solution are that it has a simple structure and good aesthetics.

[0014] In the above technical solution, the two adjacent side plates are detachably sealed on the side that is close to each other.

[0015] The beneficial effect of the above technical solution is that the bottom plate and the side panels can be separated first, and then the multiple side plates can be separated from each other to directly separate the molded body from the mold groove.

[0016] The comb tooth separator in the above technical solution includes a comb tooth plate, which has a plurality of comb teeth spaced apart, and the gap between two adjacent comb teeth forms the tooth gap. The comb tooth plate is used to be placed vertically in the mold groove, and the openings of the tooth gaps all face downward. The lower end of the comb tooth plate is in contact with the bottom wall of the mold groove, and both sides of the comb tooth plate are close to the inner sidewall of the mold groove. The comb tooth plate is used to divide the mold groove into two chambers.

[0017] The beneficial effect of the above technical solution is that the comb plate can be directly and uprightly set in the mold groove. At this time, the comb plate directly divides the mold groove into two interconnected chambers through the tooth gaps. When slurry is poured into either chamber, the slurry will flow to the other chamber through the tooth gaps.

[0018] The above technical solution describes the provision of multiple comb plates, which are distributed crosswise and / or parallel within the mold groove to collectively divide the mold groove into multiple chambers.

[0019] The beneficial effect of the above technical solution is that the arrangement of multiple comb plates can be set according to specific needs.

[0020] In the above technical solution, the multiple comb plates that are distributed in a cross pattern are integrally formed.

[0021] The beneficial effect of the above technical solution is that the distribution of multiple comb plates is fixed, thereby making the shape of multiple specimens fixed as well.

[0022] In the above technical solution, the upper ends of both sides of the comb plate are extended to form hanging ears, which are used to support the groove of the mold slot.

[0023] The beneficial effect of the above technical solution is that the upper ends of both sides of each comb plate can be supported on the upper end of the mold groove by the hanging ears.

[0024] The surface of the comb teeth in the above technical solution is provided with a hydrophobic coating.

[0025] The beneficial effect of the above technical solution is that the comb tooth separator can be easily pulled out of the molded body after the molded body has solidified. Attached Figure Description

[0026] Figure 1 This is an elevation view of the core casting mold described in an embodiment of the present invention; Figure 2 This is a top view of the core casting mold described in an embodiment of the present invention; Figure 3 This is an elevation view of the comb tooth separator described in this embodiment of the utility model; Figure 4 This is a schematic diagram of the comb plate described in the embodiment of this utility model; Figure 5 This is a schematic diagram showing the placement of the comb plate in the mold groove according to an embodiment of the present invention; Figure 6 This is a schematic diagram showing that the comb teeth are coated with a hydrophobic coating in an embodiment of this utility model; Figure 7 This is one of the schematic diagrams showing the connection between the base plate and the side plate in an embodiment of this utility model; Figure 8 This is a second schematic diagram showing the connection between the base plate and the side plate in an embodiment of this utility model; Figure 9 This is a schematic diagram of the side enclosure unfolded according to an embodiment of the present utility model; Figure 10 This is a schematic diagram of the side enclosure forming a cylindrical shape as described in an embodiment of the present invention.

[0027] In the diagram: 1. Mold groove; 11. Base plate; 111. First connecting hole; 12. Side enclosure; 121. Side plate; 122. Blind hole; 123. Flanged part; 124. Second connecting hole; 125. Hinge; 126. Fastener; 1261. Fastener male part; 1262. Fastener female part; 13. Groove; 14. Connecting bolt; 2. Comb tooth separator; 21. Comb tooth plate; 211. Comb teeth; 212. Tooth gap; 213. Hanging ear part; 214. Hydrophobic coating. Detailed Implementation

[0028] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0030] It is understood that spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0031] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0032] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0033] like Figure 1 and Figure 2 As shown, this embodiment provides a core casting mold, including a mold groove 1 and a comb-tooth separator 2. The opening of the mold groove 1 faces upward, and the comb-tooth separator 2 has multiple teeth 212 evenly distributed on it. The comb-tooth separator 2 is placed vertically in the mold groove 1 and divides the mold groove 1 into multiple chambers 13. Any two adjacent chambers 13 are connected by the teeth 212 between them. By placing the comb-tooth separator in the mold groove, when slurry is poured into any one chamber, the slurry will flow into the other chambers under the action of gravity and through the teeth, eventually making the slurry thickness in each chamber uniform. After the lower layer of slurry has initially solidified, slurry can continue to be poured into any one chamber. At this time, the slurry continues to flow into the other chambers and eventually solidifies. This process can be repeated to form a multi-layered molded body. The strength of the molded body is relatively low at the location where the comb-tooth separator separates the layers. At this time, an external force can be applied to the molded body to break it at the point of lower strength, thereby forming multiple specimens with relatively consistent interlayer parameters.

[0034] The core casting mold provided in this embodiment is quite flexible in use. The mold groove can be placed horizontally (meaning the groove opening is vertically upward) or tilted (the tilt angle can be between 0-90°, preferably between 30-60°, and the specific tilt angle depends on the needs of the experiment). The slurry composition and thickness of each layer can be different, depending on the needs of the simulation experiment. When each layer of slurry is poured, it must be ensured that the slurry below it has been initially or completely solidified. This makes the resulting molded body have a clear layered structure (i.e., the obtained molded body has a clear layered structure and can accurately reproduce the sedimentary characteristics of the target stratum).

[0035] The slurry used in this embodiment can be mortar, and the specific type of mortar can be cement mortar, cement-lime mixed mortar, lime mortar or clay mortar. It should be noted that the slurry provided in this embodiment should not contain particulate fillers, especially not particulate fillers with a particle size larger than the width of the tooth gap. This is to avoid the particulate fillers in the slurry being intercepted at the tooth gap and unable to enter the other chambers, which would ultimately lead to poor uniformity of the material parameters of the specimens corresponding to each chamber.

[0036] like Figure 1 and Figure 2 As shown, the mold groove 1 in the above technical solution is a polygonal groove, a circular groove, or an elliptical groove. This allows the shape of the mold groove to be selected according to the shape requirements of the specimen. Preferably, the mold groove can be a polygonal groove, such as a square groove, a rectangular groove, or a regular pentagonal groove, etc., depending on the specific needs, which will not be elaborated here.

[0037] like Figure 1 and Figure 2 As shown, the mold groove 1 in the above technical solution includes a base plate 11 and a side barrier 12. The side barrier 12 is cylindrical, with both its upper and lower ends open. The base plate 11 is detachably and sealed to the lower end of the side barrier 12. This allows the base plate to be separated from the side barrier after molding, which also facilitates the separation of the molded body from the mold groove.

[0038] In this embodiment, the shape and size of the base plate are consistent with the shape of the outer edge of the lower end of the side fence, which ensures that the base plate can precisely cover and block the lower end of the side fence when it is installed at the lower end of the side fence.

[0039] like Figure 7As shown, in this embodiment, the lower end of the side enclosure 12 is provided with a plurality of blind holes 122 (the blind holes are provided with internal threads) spaced out in a circumferential manner, while the edge of the base plate 11 is provided with a plurality of first connecting holes 111 spaced out in a circumferential manner, and the plurality of first connecting holes 111 correspond one-to-one with the plurality of blind holes 122. The corresponding first connecting holes 111 and blind holes 122 are aligned with each other, and then a connecting bolt 14 can be inserted to connect with the threaded blind hole, thus connecting the base plate and the side enclosure. In order to improve the sealing at the connection between the two, a sealing gasket (such as a rubber gasket) can be added at the joint; of course, if Figure 8 As shown, the lower edge of the side enclosure 12 can also be turned outward to form a circumferential flange 123 (a plurality of second connecting holes 124 can be provided circumferentially at intervals on the flange). At this time, the flange 123 is similar to an outer flange ring set at the lower end of the side enclosure, while the bottom plate is similar to a flange plate. The connection method between the bottom plate and the lower end of the side enclosure is similar to flange butt (that is, each first connecting hole is aligned with the corresponding second connecting hole and connected by nuts and bolts). This is prior art and will not be described in detail here.

[0040] The side enclosure 12 described in the above technical solution includes multiple side plates 121, all of which are vertically arranged and connected end to end to form a cylindrical shape. Its structure is simple and aesthetically pleasing. Preferably, the sides of two adjacent side plates 121 that are close to each other are detachably sealed together. This allows the base plate to be separated from the side enclosure first, and then the multiple side plates to be separated from each other to directly separate the molded body from the mold groove. In this embodiment, the connection method between two adjacent side plates can be similar to the connection method between the base plate and the side enclosure (not described in detail here). In this case, each side plate has a blind hole at its lower end or an outwardly turned flange, and the outwardly turned flanges at the lower ends of multiple side plates together form a turned flange portion 123.

[0041] like Figure 9 and Figure 10 As shown, taking a quadrilateral mold groove as an example, it has four side plates 121. The four side plates can also be linearly distributed. The side of two adjacent side plates that are close to each other is connected by hinge 125. The side of the two outermost side plates that are far apart from each other can be connected by snap or bolt (i.e., by bolt with threaded hole or bolt with nut). This makes it easier to disassemble and assemble the side panels, especially to separate the molded body from the mold groove. [Preferredly, sealing strips can be provided on the sides of each side plate (e.g., sealing strips are used for edge wrapping). This makes the sealing performance of the side of two adjacent side plates that are close to each other better when the four side plates are formed into a cylinder.]

[0042] See details Figure 9 and Figure 10As shown, the buckle 126 includes a male buckle 1261 and a female buckle 1262. The male buckle and the female buckle are respectively provided on the outermost two side plates that are far apart from each other and are aligned with each other. More preferably, multiple buckles can be provided, and the specific number can be determined according to the height of the mold groove (when multiple buckles are provided, the multiple buckles can be distributed at intervals along the height direction of the side enclosure).

[0043] Taking a circular or elliptical mold groove as an example, there can be multiple side plates, but each side plate is an arc plate. Both sides of each side plate can be turned outward, and multiple third connection holes are set at intervals along the length of the turned-out edge. The third connections on the side plates of two adjacent side plates that are close to each other correspond one-to-one and are aligned with each other to be bolted together with bolts and nuts (similar to the flange connection method, which will not be elaborated here).

[0044] In this embodiment, the mold groove is a rectangular groove, and its size can be 600mm (length) × 400mm (width) × 400mm (height). At this time, the size of the bottom plate is 600mm × 400mm, and the side plates have two specifications (there are two side plates of each specification, and the two side plates of the same specification are parallel to each other). One side plate has a size of 600mm × 400mm, and the other side plate has a size of 400mm × 400mm.

[0045] like Figures 1-3 As shown, the comb-tooth separator 2 in the above technical solution includes a comb-tooth plate 21. The comb-tooth plate 21 has multiple spaced comb teeth 211, and the gap between two adjacent comb teeth 211 forms the tooth gap 212. The comb-tooth plate 21 is vertically placed in the mold groove 1, and the openings of the tooth gaps 212 all face downwards. The lower end of the comb-tooth plate 21 is in contact with the bottom wall of the mold groove 1, and both sides of the comb-tooth plate 21 are close to the inner sidewall of the mold groove 1. The comb-tooth plate 21 is used to divide the mold groove 1 into two chambers 13. In this way, the comb-tooth plate can be directly and vertically set in the mold groove. At this time, the comb-tooth plate directly divides the mold groove into two chambers that are interconnected through the tooth gaps. When slurry is poured into either chamber, the slurry will flow to the other chamber through the tooth gaps.

[0046] Preferred, such as Figure 4 and Figure 5 As shown, the upper ends of both sides of the comb plate 21 are extended to form hanging ears 213, which are used to support the groove opening of the mold groove 1. This allows the upper ends of both sides of each comb plate to be supported by the hanging ears at the upper end of the mold groove.

[0047] like Figure 6As shown, further preferably, a hydrophobic coating 214 is provided on the surface of the comb teeth 211. In this way, after the molded body is cured, the comb tooth separator can be conveniently pulled out from the molded body. In this embodiment, the height of the comb tooth plate needs to satisfy that when the hanging ear part is placed on the upper end of the mold groove, the comb tooth plate hangs freely at this time, and its lower end just abuts against the inner bottom wall of the mold groove and is perpendicular to each other. In this embodiment, the hydrophobic coating can be a PDMS coating (PDMS - polydimethylsiloxane material). In this embodiment, the hydrophobic coating is applied to the comb teeth because it has low surface energy characteristics to reduce the adhesion force of cement and maintain thermal stability to adapt to the environmental temperature during the cement hydration process. In this embodiment, the PDMS coating is selected because it can be reused more than 200 times under laboratory conditions without affecting the compressive strength of cement, and the optimal demolding performance can be achieved when the coating thickness is controlled within the range of 50 - 200 μm; further preferably, the entire surface of the comb tooth plate can be coated with a hydrophobic coating, and in the actual operation process, a demolding agent can also be directly sprayed on the surface of the comb tooth plate before use to replace the hydrophobic coating (the types of demolding agents in the field of cement mortar or concrete pouring belong to the prior art and will not be elaborated here).

[0048] As Figure 1 and Figure 3 As shown, in the above technical solution, a plurality of comb tooth plates 21 are provided, and the plurality of comb tooth plates 21 are cross - distributed and / or parallel - distributed in the mold groove 1 to jointly divide the mold groove 1 into a plurality of chambers 13. In this way, the arrangement mode of the plurality of comb tooth plates can be set according to specific needs. Specifically, in this embodiment, the number of the comb tooth plates can be one, and of course, it can also be multiple. For example, when two comb tooth plates are provided, the two comb tooth plates can be parallel to each other, or intersect (when intersecting, it can be an intersection in a "cross" - shaped vertical state, or an intersection in an "X" - shaped non - vertical state), and of course, the two comb tooth plates can also be in a state of being non - parallel but non - intersecting; when there are four comb tooth plates, the four comb tooth plates can be parallel to each other or distributed in a "#" - shaped or "abundant" - shaped manner. Of course, the number of comb tooth plates in this embodiment is not limited, and the above examples are only for simply illustrating that when the number of comb tooth plates is multiple, their arrangement modes can be determined according to human needs.

[0049] It should be noted that, as Figure 1 and Figure 3 shown, in this embodiment, the thickness of the comb tooth plate needs to be less than the width of the tooth gap, so as to ensure that two comb tooth plates can be cross - distributed (one comb tooth plate passes through any tooth gap of the other comb tooth plate).

[0050] Of course, the multiple cross-distributed comb plates 21 can be integrally molded. In this case, the structure of the comb tooth separator is fixed, and the shape and size of the matching mold groove are also fixed. This makes the distribution state of the multiple comb plates fixed, thereby making the shape of the multiple specimens fixed. However, in order to reduce the structural strength of the molded body at the position of the comb plates, the width of the tooth gap should not be too large. Preferably, the width of the tooth gap should not exceed 1 cm, while the width of the comb teeth can be not less than 1 cm, but preferably not more than 5 cm.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A core casting mold, characterized in that, It includes a mold groove (1) and a comb tooth separator (2). The opening of the mold groove (1) faces upward. The comb tooth separator (2) has multiple tooth gaps (212) evenly distributed on it. The comb tooth separator (2) is used to be placed vertically in the mold groove (1) and divide the mold groove (1) into multiple chambers (13). Any two adjacent chambers (13) are connected through the tooth gaps (212) between them.

2. The core casting mold according to claim 1, characterized in that, The mold groove (1) is a polygonal groove, a circular groove, or an elliptical groove.

3. The core casting mold according to claim 2, characterized in that, The mold groove (1) includes a base plate (11) and a side enclosure (12). The side enclosure (12) is cylindrical and has an open top and bottom. The base plate (11) is detachably and sealed at the bottom of the side enclosure (12).

4. The core casting mold according to claim 3, characterized in that, The side enclosure (12) includes multiple side panels (121), all of which are vertically arranged and connected end to end to form a cylindrical shape.

5. The core casting mold according to claim 4, characterized in that, The two adjacent side plates (121) are detachably sealed together on the side closest to each other.

6. The core casting mold according to any one of claims 1-5, characterized in that, The comb tooth separator (2) includes a comb tooth plate (21), which has a plurality of comb teeth (211) spaced apart, and the gap between two adjacent comb teeth (211) forms the tooth gap (212). The comb tooth plate (21) is used to be placed vertically in the mold groove (1), and the openings of the tooth gaps (212) are all facing downwards. The lower end of the comb tooth plate (21) is in contact with the bottom wall of the mold groove (1), and both sides of the comb tooth plate (21) are close to the inner sidewall of the mold groove (1). The comb tooth plate (21) is used to divide the mold groove (1) into two chambers (13).

7. The core casting mold according to claim 6, characterized in that, Multiple comb plates (21) are provided, and the multiple comb plates (21) are distributed crosswise and / or parallelly in the mold groove (1) to jointly divide the mold groove (1) into multiple chambers (13).

8. The core casting mold according to claim 7, characterized in that, Multiple comb plates (21) arranged in a cross pattern are integrally formed.

9. The core casting mold according to claim 6, characterized in that, The upper ends of both sides of the comb plate (21) are extended to form ear loops (213), which are used to support the groove of the mold slot (1).

10. The core casting mold according to claim 6, characterized in that, The surface of the comb teeth (211) is provided with a hydrophobic coating (214).

Images