Preparation mold and preparation method suitable for perforated test blocks with different apertures

Abstract

The invention belongs to the technical field of preparation of perforated test blocks, and particularly relates to a preparation mold and a preparation method suitable for perforated test blocks with different apertures. The preparation mold comprises a positioning base, a mold box body, a variable-diameter mold plate and a plurality of insertion rods, the bottom ends of the insertion rods are positioned and fixed on the positioning base, and the upper parts of the insertion rods penetrate through the variable-diameter mold plate and are positioned by the variable-diameter mold plate; the variable-diameter template comprises an upper cover, a stepless variable-diameter mechanism and a lower disc; the stepless reducing mechanism is arranged in the lower disc, the upper cover is fixed on the lower disc, and through holes are formed in the central position of the lower disc and the central position of the upper cover; the stepless reducing mechanism at least comprises a plurality of toothed sliding sheets, and a stepless reducing hole is formed in the center defined by the toothed sliding sheets. According to the preparation device, accurate positioning of the insertion rods with different diameters is realized, so that perforated test blocks with different apertures can be more conveniently prepared, and the preparation precision and the preparation efficiency of the perforated test blocks can be greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of preparation of perforated specimens, and particularly relates to a preparation mold and a preparation method for perforated specimens suitable for different pore diameters. Background Art

[0002] In the field of material mechanics performance testing, perforated specimens, as important carriers for evaluating the crack resistance, permeability and durability of concrete, ceramics, composite materials, etc., the preparation accuracy and efficiency directly affect the reliability of test results and engineering safety. Traditional specimen molds usually adopt fixed pore diameters or design of punching holes after sample preparation; the above traditional practices have significant limitations: firstly, molds with a single pore diameter cannot adapt to diverse test requirements, and it is necessary to repeatedly purchase or customize molds of different specifications, resulting in high costs and large space occupation by molds of different specifications; secondly, the fixation of the insertion rod depends on manual adjustment or a simple clamping device, and uneven clamping force or inaccurate positioning of the insertion rod is likely to cause the insertion rod to deflect, resulting in problems such as eccentric holes and rough inner walls in the formed specimens, affecting the accuracy of subsequent test data. In addition, traditional molds have insufficient compatibility with micro pore diameters or ultra-large pore diameters, restricting their application in high-end material research and development or special engineering scenarios.

[0003] Moreover, with the acceleration of new material research and development and the refinement of testing standards, the demand for the diversity of specimen pore diameters, preparation efficiency and precision is becoming increasingly urgent, and the inherent defects of traditional molds have become a bottleneck restricting the development of testing technologies. Therefore, it is necessary to provide an improved technical solution for the deficiencies of the above existing technologies. Summary of the Invention

[0004] The purpose of the present invention is to provide a preparation mold and a preparation method for perforated specimens suitable for different pore diameters, so as to at least solve the above problems existing in the prior art.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] A preparation mold for perforated specimens suitable for different pore diameters, the preparation mold includes a positioning base, a mold box body, a variable diameter template and a plurality of insertion rods with different diameters, the mold box body is installed on the positioning base, the variable diameter template covers the top of the mold box body, the bottom end of the insertion rod is positioned and fixed on the positioning base, and the upper part of the insertion rod penetrates through the variable diameter template and is positioned by the variable diameter template;

[0007] The variable diameter template includes an upper cover, a stepless variable diameter mechanism and a lower disk; the stepless variable diameter mechanism is arranged in the lower disk, and the upper cover is fixed on the lower disk,

[0008] Through holes are provided at the central positions of both the lower disk and the upper cover;

[0009] The stepless variable-diameter mechanism at least includes multiple toothed sliding plates, and a stepless variable-diameter hole is formed at the center surrounded by the multiple toothed sliding plates;

[0010] When the multiple toothed sliding plates move towards the center of the stepless variable-diameter hole simultaneously, the aperture of the stepless variable-diameter hole shrinks;

[0011] When the multiple toothed sliding plates move away from the center of the stepless variable-diameter hole simultaneously, the aperture of the stepless variable-diameter hole expands.

[0012] For the perforated specimen preparation mold suitable for different apertures as described above, preferably, there are four toothed sliding plates, each toothed sliding plate has a right-angle part, and the two right-angle sides of the right-angle part of each toothed sliding plate are respectively attached to the right-angle sides of the adjacent toothed sliding plates;

[0013] The right-angle parts of the four toothed sliding plates surround to form a stepless variable-diameter hole with a square-hole structure.

[0014] For the perforated specimen preparation mold suitable for different apertures as described above, preferably, on the side of the right-angle part of the toothed sliding plate that faces away, there is an inclined-edge part, and a long groove is arranged inside the inclined-edge part of the toothed sliding plate, and the long groove is parallel to the inclined-edge part;

[0015] At the position corresponding to the long groove of each toothed sliding plate on the lower plate, a plurality of sliding-plate limit bolts are arranged, and each toothed sliding plate can be guided to move along the plurality of sliding-plate limit bolts through the long groove.

[0016] For the perforated specimen preparation mold suitable for different apertures as described above, preferably, a straight-tooth structure is arranged on the inclined-edge part of the toothed sliding plate,

[0017] On the side corresponding to the straight-tooth structure of each toothed sliding plate on the lower plate, a rotating gear is rotatably arranged, and the rotating gear is in meshing transmission with the straight-tooth structure. By driving the rotating gear to rotate self, the toothed sliding plate is driven to move along the plurality of sliding-plate limit bolts.

[0018] For the perforated specimen preparation mold suitable for different apertures as described above, preferably, a circular sunk groove is arranged on the upper surface of the lower plate, and the stepless variable-diameter mechanism is arranged in the circular sunk groove;

[0019] The stepless variable-diameter mechanism further includes an adjusting ring, the outer ring of the adjusting ring is circular, and the adjusting ring is rotatably arranged in the circular sunk groove;

[0020] Four internal rack structures are arranged on the inner ring of the adjusting ring, and each internal rack structure is in meshing transmission with a rotating gear;

[0021] An adjusting dial is arranged on one side of the adjusting ring, and a long through-hole is arranged on the side wall of the sunk groove, and the adjusting dial passes through the long through-hole on the side wall of the sunk groove.

[0022] As described above, the mold for preparing test blocks with holes of different apertures, preferably, the positioning base comprises a base body, a positioning mechanism is arranged at the center of the base body, and the positioning mechanism is used to position and fix the bottom end of the insertion rod;

[0023] The positioning mechanism comprises a housing, a plurality of fixing rods and a plurality of small extrusion rods, wherein one end of the fixing rod is fixed to the housing, and the other end is cantilevered toward the center of the housing to form a cantilevered end;

[0024] A small extrusion rod is rotatably arranged at the overhanging end of each fixed rod, and the overhanging end of the fixed rod is rotatably connected to the middle part of the small extrusion rod.

[0025] As described above, the mold for preparing test blocks with holes of different apertures, preferably, the positioning mechanism further comprises a spring and a pressing plate, the spring is arranged at the center of the plurality of extrusion rods, and the pressing plate covers the spring;

[0026] The top end of the extrusion rod is provided with an arc-shaped pressing block.

[0027] As described above, for preparing the perforated test blocks with different apertures, preferably, a first air vent is provided through the center of the base body, a second air vent is provided through the center of the shell, and the first air vent is connected to the second air vent.

[0028] As described above, the mold for preparing test blocks with holes of different apertures is preferably provided with a plurality of grooves evenly on the outer ring of the top of the mold box, and a plurality of protrusions evenly on the outer ring of the lower plate, each protrusion is inserted into a groove, so that the variable diameter template is relatively fixed to the upper end of the mold box;

[0029] The base body is provided with a circle of slots, and the bottom end of the mold box is inserted into the slots.

[0030] The present application also provides a method for preparing a test block with holes suitable for different hole diameters, wherein the method uses the test block with holes suitable for different hole diameters to prepare a mold, and the method comprises the following steps:

[0031] Step 1: first assemble the positioning base, the mold box and the variable diameter template in sequence to form the outer shape structure of the preparation mold; and turn the adjustment paddle to make the multiple toothed slides move in opposite directions, so that the infinitely variable diameter hole on the variable diameter template is enlarged;

[0032] Step 2, inserting the insertion rod into the positioning mechanism on the positioning base, so that the arc-shaped pressing blocks of the multiple squeezing small rods hold the bottom end of the insertion rod tightly, thereby achieving positioning and fixing of the bottom end of the insertion rod;

[0033] Step 3: Turn the adjustment dial again to make the multiple toothed sliding pieces move towards each other, reducing the stepless variable-diameter holes on the variable-diameter template until all the toothed sliding pieces are in contact with the upper part of the insertion rod, achieving the positioning and fixing of the upper part of the insertion rod.

[0034] Step 4: Inject the wet material required for forming the perforated test block into the preparation mold through the gap between the insertion rod and the stepless variable-diameter holes on the variable-diameter mold.

[0035] Step 5: After the wet material solidifies, connect the demolding air pump to the first ventilation hole to introduce gas into the preparation mold; then remove the insertion rod from the perforated test block, and separate the positioning base, the mold box body and the variable-diameter template from each other, thereby taking out the prepared perforated test block.

[0036] Step 6: Clean the positioning base, the mold box body, the variable-diameter template and the insertion rod for reuse.

[0037] Beneficial effects:

[0038] In this preparation device, setting the variable-diameter template can meet the central positioning of insertion rods with different diameters, and through the mutual cooperation of the positioning base and the variable-diameter template, accurate positioning of insertion rods with different diameters can be achieved, making it more convenient to produce perforated test blocks with different hole diameters, and greatly improving the production accuracy and efficiency of the perforated test blocks.

[0039] When the bottom end of the insertion rod is inserted into the positioning mechanism, the bottom end of the insertion rod acts on the pressure plate. Under the action of its own gravity, the spring is compressed, causing the pressure plate to move downward. During the downward movement of the pressure plate, it gradually presses down on the bottom end of the extrusion rod, causing the extrusion rod to rotate around the overhanging end of the fixed rod, making the arc-shaped pressing blocks at the tops of the multiple extrusion rods move inward to gather, so that the multiple arc-shaped pressing blocks are tightly pressed against the bottom of the insertion rod, achieving the positioning and fixing of the bottom end of the insertion rod.

[0040] In the stepless variable-diameter mechanism, by turning the adjustment dial, the adjustment ring rotates in the circular sunk groove. The adjustment ring drives the rotating gear to rotate, and the rotating gear drives the toothed sliding piece to move in the guiding direction along the long groove; by controlling the rotation direction of the adjustment dial, the adjustment ring can be rotated forward or backward, thereby realizing the aggregation and separation movement of the four toothed sliding pieces. When the four toothed sliding pieces aggregate with each other, the stepless variable-diameter hole shrinks; when the four toothed sliding pieces move away from each other, the stepless variable-diameter hole expands, so that the stepless variable-diameter hole can be applicable to insertion rods with different diameters and position and fix the upper part of the insertion rod. Description of the drawings

[0041] The schematic diagrams in the specification, which form a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

[0042] Figure 1 Schematic diagram of the overall structure of the preparation mold for an embodiment of the present invention

[0043] Figure 2 Schematic diagram of the structure of the variable diameter template for an embodiment of the present invention

[0044] Figure 3 Schematic diagram of the structure of the stepless variable diameter mechanism for an embodiment of the present invention

[0045] Figure 4 Schematic diagram of the structure of the mold box for an embodiment of the present invention

[0046] Figure 5 Schematic diagram of the angle at the bottom of the mold box for an embodiment of the present invention

[0047] Figure 6 Schematic diagram of the structure of the positioning base for an embodiment of the present invention

[0048] Figure 7 Schematic diagram of the angle at the bottom of the positioning base for an embodiment of the present invention

[0049] Figure 8 Schematic diagram of the structure of the positioning mechanism for an embodiment of the present invention

[0050] Figure 9 Schematic diagram of the outer shell of the positioning mechanism for an embodiment of the present invention

[0051] Figure 10 Schematic diagram of the small extrusion rod in the positioning structure for an embodiment of the present invention

[0052] In the figure:

[0053] 1 - Variable diameter template, 2 - Mold box, 3 - Positioning base

[0054] 101 - Upper cover, 1011 - Template screw, 102 - Stepless variable diameter mechanism, 103 - Lower disc, 1031 - Protrusion

[0055] 1021 - Adjusting ring, 1022 - Adjusting dial, 1023 - Gear, 1024 - Toothed sliding piece, 1025 - Gear bolt, 1026 - Sliding piece limit bolt

[0056] 201 - Box body screw, 202 - Groove, 203 - Strip rib, 204 - Wing plate

[0057] 301 - Base main body, 302 - Slot, 303 - Base screw hole, 304 - Horizontal bubble level, 305 - Positioning mechanism, 306 - Reinforcing rib, 307 - First ventilation hole

[0058] 3051 - housing, 3052 - fixing rod, 3053 - second vent hole, 3054 - extrusion rod, 3055 - spring, 3056 - pressing plate. Specific embodiments

[0059] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0060] In the description of the present invention, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0061] The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0062] According to the specific embodiment of the present invention, as Figures 1-10 shown, the present invention provides a preparation mold for perforated test blocks suitable for different apertures. The preparation mold includes a positioning base 3, a mold box body 2, a variable diameter template 1 and a plurality of insertion rods with different diameters. The mold box body 2 is installed on the positioning base 3, the variable diameter template 1 covers the top of the mold box body 2, the bottom end of the insertion rod is positioned and fixed on the positioning base 3, and the upper part of the insertion rod penetrates through the variable diameter template 1 and is positioned by the variable diameter template 1.

[0063] The variable diameter template 1 includes an upper cover 101, a stepless variable diameter mechanism 102 and a lower disc 103; the stepless variable diameter mechanism 102 is arranged in the lower disc 103, and the upper cover 101 is fixed on the lower disc 103. In this embodiment, the upper cover 101 is fixed on the lower disc 103 by a plurality of template screws 1011 to facilitate the disassembly and repair of the variable diameter template 1.

[0064] Through holes are provided at the central positions of the lower plate 103 and the upper cover 101. In this embodiment, the shape and size of the through holes on the upper cover 101 and the lower plate 103 are larger than the central variable diameter hole of the stepless variable diameter mechanism 102 to prevent the upper cover 101 and the lower plate 103 from affecting the stepless variable diameter mechanism 102.

[0065] The stepless variable diameter mechanism 102 at least includes multiple toothed sliding plates 1024, and a stepless variable diameter hole is formed at the center surrounded by the multiple toothed sliding plates 1024.

[0066] When the multiple toothed sliding plates 1024 move simultaneously towards the center of the stepless variable diameter hole, the aperture of the stepless variable diameter hole shrinks.

[0067] When the multiple toothed sliding plates 1024 move simultaneously away from the center of the stepless variable diameter hole, the aperture of the stepless variable diameter hole expands.

[0068] When using this preparation mold to make test blocks with different apertures: first select the insertion rod with the required diameter, then insert the bottom end of the insertion rod on the positioning base 3 to position the bottom end of the insertion rod through the positioning base 3; the upper part of the insertion rod penetrates through the variable diameter template 1. Specifically, the upper part of the insertion rod penetrates through the stepless variable diameter hole of the stepless variable diameter mechanism 102. By moving the multiple toothed sliding plates 1024 towards or away from the center of the stepless variable diameter hole, each toothed sliding plate 1024 is in contact with the outer peripheral surface of the insertion rod, thereby playing a role in positioning the upper part of the insertion rod. That is, in this preparation device, setting the variable diameter template 1 can meet the central positioning of insertion rods with different diameters, and through the mutual cooperation of the positioning base 3 and the variable diameter template 1, accurate positioning of insertion rods with different diameters can be achieved, making it more convenient to make perforated test blocks with different apertures and greatly improving the production accuracy and production efficiency of the perforated test blocks.

[0069] There are four toothed sliding plates 1024, each toothed sliding plate 1024 has a right-angle part, and the two right-angle sides of the right-angle part of each toothed sliding plate 1024 are respectively in contact with the right-angle sides of the adjacent toothed sliding plates 1024; the right-angle parts of the four toothed sliding plates 1024 surround to form a stepless variable diameter hole with a square hole structure.

[0070] In an embodiment of the present application, the stepless variable diameter hole has a square hole structure, and the square hole structure is a centrally symmetric structure. By the right-angle sides of the 4 toothed sliding plates 1024 being in contact with the outer peripheral surface of the insertion rod respectively, it is more convenient to accurately center-position the insertion rod, thereby greatly improving the preparation accuracy of the perforated test block.

[0071] The side of the right-angle part of the toothed sliding plate 1024 opposite to each other is an inclined side part, and a long groove is provided inside the inclined side part of the toothed sliding plate 1024, and the long groove is parallel to the inclined side part.

[0072] On the lower disk 103, a plurality of slide vane limit bolts 1026 are provided at the positions of the long slots corresponding to each toothed slide vane 1024, and each toothed slide vane 1024 can be guided to move along the long slot along the plurality of slide vane limit bolts 1026.

[0073] In an embodiment of the present application, at the position of the long slot corresponding to each toothed slide vane 1024, a plurality of slide vane limit bolts 1026 are provided on the lower disk 103, and the plurality of slide vane limit bolts 1026 are arranged along the extending direction of the long slot.

[0074] In this embodiment, two slide vane limit bolts 1026 are provided in the long slot of each toothed slide vane 1024, and the two slide vane limit bolts 1026 can define a straight line; thus, each toothed slide vane 1024 can be guided to move along the extending direction of the long slot, ensuring the sliding stability and position accuracy of each toothed slide vane 1024, which is beneficial to the more smooth and stable diameter-changing movement of the stepless variable-diameter hole.

[0075] In this embodiment, the toothed slide vane 1024 has a right-angled triangle structure with a missing corner, and one corner is missing to ensure its maximum movement trajectory and avoid movement interference.

[0076] A straight-tooth structure is provided on the hypotenuse of the toothed slide vane 1024, and a rotating gear 1023 is rotatably provided on one side of the straight-tooth structure of each toothed slide vane 1024 on the lower disk 103. The rotating gear 1023 meshes with the straight-tooth structure for transmission. By driving the rotating gear 1023 to rotate, the toothed slide vane 1024 is driven to move along the plurality of slide vane limit bolts 1026.

[0077] In an embodiment of the present application, the four toothed slide vanes 1024 are respectively driven by four rotating gears 1023. Taking one gear 1023 as an example, a gear bolt 1025 is provided on the lower disk 103, and the rotating gear 1023 is rotatably provided on the gear bolt 1025, that is, the rotating gear 1023 rotates around the gear bolt 1025 as the axis, thereby driving the toothed slide vane 1024 to perform reciprocating motion.

[0078] A circular sunk groove is provided on the upper surface of the lower disk 103, and the stepless variable-diameter mechanism 102 is provided in the circular sunk groove.

[0079] The stepless variable-diameter mechanism 102 further includes an adjusting ring 1021. The outer ring of the adjusting ring 1021 is circular, and the adjusting ring 1021 is rotatably provided in the circular sunk groove.

[0080] Four internal rack structures are provided on the inner ring of the adjusting ring 1021, and each internal rack structure meshes with one rotating gear 1023 for transmission.

[0081] An adjusting paddle 1022 is provided on one side of the adjusting ring 1021 , and a long through hole is provided on the side wall of the sink, through which the adjusting paddle 1022 passes.

[0082] In one embodiment of the present application, the inner rack structure on the adjustment ring 1021 is arc-shaped. Each rotating gear 1023 is located between a section of the inner rack structure on the adjustment ring 1021 and the spur gear portion of the toothed slide 1024, one side of the rotating gear 1023 is meshed with the spur gear portion of the toothed slide 1024 for transmission, and the other side is meshed with a section of the inner rack structure on the adjustment ring 1021 for transmission. Specifically, by toggling the adjusting paddle 1022, the adjusting ring 1021 is rotated in the circular groove, and the adjusting ring 1021 drives the rotating gear 1023 to rotate, and the rotating gear 1023 drives the toothed slide 1024 to move along the extension direction of the long groove; by toggling the rotation direction of the adjusting paddle 1022, the forward or reverse rotation of the adjusting ring 1021 is controlled, so as to realize the convergence and separation movement of the four toothed slides 1024. When the four toothed slides 1024 converge with each other, the stepless variable hole shrinks; when the four toothed slides 1024 move away from each other, the stepless variable hole expands, so that the stepless variable hole can be suitable for insertion rods of different diameters.

[0083] The positioning base 3 comprises a base body 301 , a positioning mechanism 305 is arranged at the center of the base body 301 , and the positioning mechanism 305 is used to position and fix the bottom end of the insertion rod.

[0084] The positioning mechanism 305 includes a housing 3051, a plurality of fixing rods 3052 and a plurality of small extrusion rods 3054. One end of the fixing rod 3052 is fixed to the housing 3051, and the other end is cantilevered toward the center of the housing 3051 to form a cantilevered end.

[0085] A small extrusion rod 3054 is rotatably provided at the overhanging end of each fixed rod 3052 , and the overhanging end of the fixed rod 3052 is rotatably connected to the middle part of the small extrusion rod 3054 .

[0086] In one embodiment of the present application, four fixing rods 3052 are provided, and four extrusion rods 3054 are also provided; a extrusion rod 3054 is rotatably provided at the overhanging end of each fixing rod 3052, thereby ensuring that the multiple extrusion rods 3054 can more evenly press and fix the insertion rod.

[0087] The positioning mechanism 305 further includes a spring 3055 and a pressure plate 3056 . The spring 3055 is arranged at the center of the plurality of squeezing rods 3054 , and the pressure plate 3056 covers the spring 3055 . An arc-shaped pressure block is arranged at the top end of the squeezing rod 3054 .

[0088] In an embodiment of the present application, when the bottom end of the insertion rod is inserted into the positioning mechanism 305, the bottom end of the insertion rod acts on the pressure plate 3056. Under the action of its own gravity, the spring 3055 is pressed down, causing the pressure plate 3056 to move downward. During the downward movement of the pressure plate 3056, the bottom end of the extrusion rod 3054 is gradually pressed, causing the extrusion rod 3054 to rotate around the overhanging end of the fixed rod 3052, and causing the arc-shaped pressing blocks at the tops of the plurality of extrusion rods 3054 to gather inward, so that the plurality of arc-shaped pressing blocks are pressed tightly against the bottom of the insertion rod, realizing the positioning and fixing of the bottom end of the insertion rod.

[0089] A first ventilation hole 307 is provided through the center of the base body 301, and a second ventilation hole 3053 is provided through the center of the outer shell 3051. The first ventilation hole 307 and the second ventilation hole 3053 are in communication with each other.

[0090] In an embodiment of the present application, since the formed wet material of the perforated test block poured into the preparation mold has a certain viscosity and the gap in the positioning mechanism 305 on the positioning base 3 is small, the wet material will not flow into the positioning mechanism 305, and the wet material will not flow out from the first ventilation hole 307 and the second ventilation hole 3053. Generally, after the perforated test block in the preparation mold is prepared and formed, a demolding air pump is used to connect to the first ventilation hole 307 to introduce gas into the preparation mold, so as to facilitate the separation operation of the perforated test block and the preparation mold.

[0091] In this embodiment, a radially structured reinforcing rib 306 is further provided on the back of the base body 301 to enhance the structural strength of the base body 301; a horizontal spirit level 304 is further provided on one side of the base body 301 to facilitate the adjustment of the levelness of the entire preparation mold.

[0092] A plurality of grooves 202 are evenly provided on the outer ring at the top of the mold box body 2, and a plurality of protrusions 1031 are evenly provided on the outer ring of the lower disc 103. Each protrusion 1031 is inserted into a groove 202, so that the variable-diameter template 1 is relatively fixed to the upper end of the mold box body 2.

[0093] A circular slot 302 is provided on the base body 301, and the bottom end of the mold box body 2 is inserted into the slot 302.

[0094] In an embodiment of the present application, both the base body 301 and the variable-diameter mold are square structures, and the mold box body 2 is a hollow square column structure.

[0095] The wall thickness at the bottom end of the mold box body 2 is relatively thinner than other positions. The mold box body 2 is inserted into the slot 302 of the base body 301 at the thinner wall thickness at the bottom end, so as to facilitate the positioning and sealing of the mold box body 2 and the base body 301.

[0096] The outer side of the mold box 2 is provided with a slat rib 203, and a wing plate 204 extending in the horizontal direction is provided at the bottom end of the slat rib 203. The wing plate 204 is provided with a screw through hole, and a base screw hole 303 is provided on the base body 301. The box screw 201 passes through the screw through hole on the wing plate 204 and is fixed in the base screw hole 303, thereby realizing the fixation of the mold box 2 relative to the base body 301.

[0097] The present application also provides a method for preparing a test block with holes suitable for different hole diameters. The preparation method uses the above-mentioned test block with holes suitable for different hole diameters to prepare a mold. The preparation method comprises the following steps:

[0098] Step 1, first assemble the positioning base 3, the mold box 2 and the variable diameter template 1 in sequence to form the outer shape structure of the preparation mold; and turn the adjusting paddle 1022 to make the multiple toothed slides 1024 move in opposite directions, and the stepless variable diameter hole on the variable diameter template 1 is enlarged;

[0099] Step 2, insert the insertion rod into the positioning mechanism 305 on the positioning base 3, so that the arc-shaped pressing blocks of the multiple squeezing small rods 3054 hold the bottom end of the insertion rod tightly, thereby achieving positioning and fixing of the bottom end of the insertion rod;

[0100] Step 3, toggle the adjusting paddle 1022 again to make the multiple toothed slides 1024 move toward each other, and the stepless variable diameter hole on the variable diameter template 1 is reduced until the multiple toothed slides 1024 are in contact with the upper part of the insertion rod, thereby achieving positioning and fixing of the upper part of the insertion rod;

[0101] Step 4, injecting wet material required for forming the perforated test block into the preparation mold from the gap between the insertion rod and the infinitely variable diameter hole on the variable diameter mold;

[0102] Step 5, after the wet material solidifies, a demoulding air pump is used to connect the first vent hole 307 to introduce gas into the preparation mold; then the insertion rod is removed from the test block with holes, and the positioning base 3, the mold box 2 and the variable diameter template 1 are separated from each other, so as to take out the prepared test block with holes;

[0103] Step 6, cleaning the positioning base 3, the mold box 2, the variable diameter template 1 and the insertion rod for reuse.

[0104] In other embodiments of the present application, the mold box body 2 can also be first installed on the positioning base 3, then the insertion rod is fixed on the positioning mechanism 305, and then wet material is injected into the mold box body 2; before the wet material solidifies, the variable-diameter template 1 is quickly fixed on the top of the mold box body 2, and the adjustment dial 1022 is toggled to reduce the infinitely variable-diameter hole, so as to realize the positioning and fixing of the upper part of the insertion rod; then after the wet material solidifies, the perforated test block can be taken out of the preparation mold; in this embodiment, the wet material is first poured into the mold box body 2, and then the variable-diameter template 1 is installed, which is more convenient for the pouring operation of the wet material.

[0105] It can be understood that the above description is only exemplary, and the embodiments of the present application do not limit this.

[0106] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the scope of the claims of the present invention awaiting approval.

Claims

1. A mold for preparing test blocks with holes of different hole diameters, characterized in that: The preparation mold includes a positioning base, a mold box, a variable diameter template and a plurality of insertion rods with different diameters, the mold box is installed on the positioning base, the variable diameter template covers the top of the mold box, the bottom end of the insertion rod is positioned and fixed on the positioning base, the upper part of the insertion rod passes through the variable diameter template and is positioned by the variable diameter template; The variable diameter template includes an upper cover, a stepless variable diameter mechanism and a lower plate; the stepless variable diameter mechanism is arranged in the lower plate, and the upper cover is fixed on the lower plate. A through hole is provided at the center of the lower plate and the center of the upper cover; The stepless diameter-changing mechanism at least comprises a plurality of toothed sliding plates, and a stepless diameter-changing hole is formed at the center surrounded by the plurality of toothed sliding plates; When the multiple toothed slides move toward the center of the stepless variable diameter hole at the same time, the diameter of the stepless variable diameter hole is reduced; When the plurality of toothed sliding plates move away from the center of the stepless diameter-changing hole at the same time, the diameter of the stepless diameter-changing hole expands.

2. The mold for preparing test blocks with holes suitable for different hole diameters according to claim 1, characterized in that: There are four toothed slides, each of which has a right-angle portion, and two right-angle sides of the right-angle portion of each toothed slide are respectively in contact with the right-angle sides of the adjacent toothed slides; The right-angled parts of the four toothed sliding plates enclose and form a stepless variable diameter hole with a square hole structure.

3. The mold for preparing test blocks with holes suitable for different hole diameters according to claim 2, characterized in that: The side opposite to the right angle portion of the toothed slide is a hypotenuse portion, and a long groove is arranged inside the hypotenuse portion of the toothed slide, and the long groove is parallel to the hypotenuse portion; A plurality of slide stop bolts are arranged on the lower plate at the position of the long slot corresponding to each toothed slide, and each toothed slide can be guided and moved along the plurality of slide stop bolts through the long slot.

4. The mold for preparing test blocks with holes suitable for different hole diameters according to claim 3, characterized in that: The toothed sliding plate has a straight tooth structure on the beveled edge. A rotating gear is rotatably provided on one side of the spur tooth structure corresponding to each toothed slide on the lower plate, and the rotating gear is meshed with the spur tooth structure for transmission, and the rotating gear is driven to rotate, thereby driving the toothed slide to move along the guides of multiple slide limit bolts.

5. The mold for preparing test blocks with holes suitable for different hole diameters according to claim 4, characterized in that: The upper surface of the lower plate is provided with a circular sink groove, and the stepless diameter-changing mechanism is arranged in the circular sink groove; The stepless diameter-changing mechanism further comprises an adjusting ring, the outer ring of which is circular, and the adjusting ring is rotatably arranged in the circular sink; The inner ring of the adjusting ring is provided with four sections of inner rack structures, and each section of the inner rack structure is meshed with a rotating gear for transmission; An adjusting paddle is arranged on one side of the adjusting ring, a long through hole is arranged on the side wall of the sink, and the adjusting paddle passes through the long through hole on the side wall of the sink.

6. The mold for preparing test blocks with holes suitable for different hole diameters according to claim 5, characterized in that: The positioning base comprises a base body, a positioning mechanism is arranged at the center of the base body, and the positioning mechanism is used to position and fix the bottom end of the insertion rod; The positioning mechanism comprises a housing, a plurality of fixing rods and a plurality of small extrusion rods, one end of the fixing rod is fixed to the housing, and the other end is cantilevered toward the center of the housing to form a cantilevered end; A small extrusion rod is rotatably arranged at the overhanging end of each fixed rod, and the overhanging end of the fixed rod is rotatably connected to the middle part of the small extrusion rod.

7. The mold for preparing test blocks with holes suitable for different hole diameters according to claim 6, characterized in that: The positioning mechanism also includes a spring and a pressure plate, wherein the spring is arranged at the center of a plurality of small extrusion rods, and the pressure plate covers the spring; The top end of the extrusion rod is provided with an arc-shaped pressing block.

8. The mold for preparing test blocks with holes suitable for different hole diameters according to claim 7, characterized in that: A first vent hole is disposed through the center of the base body, and a second vent hole is disposed through the center of the shell. The first vent hole and the second vent hole are connected to each other.

9. The mold for preparing test blocks with holes suitable for different hole diameters according to claim 7, characterized in that: A plurality of grooves are evenly arranged on the outer ring of the top of the mold box, and a plurality of protrusions are evenly arranged on the outer ring of the lower plate, each protrusion is inserted into a groove, so that the variable diameter template and the upper end of the mold box are relatively fixed; The base body is provided with a circle of slots, and the bottom end of the mold box is inserted into the slots.

10. A method for preparing a test block with holes suitable for different hole diameters, characterized in that: The preparation method uses the test block with holes suitable for different hole diameters as claimed in claim 8 to prepare a mold, and the preparation method comprises the following steps: Step 1: first assemble the positioning base, the mold box and the variable diameter template in sequence to form the outer shape structure of the preparation mold; and turn the adjustment paddle to make the multiple toothed slides move in opposite directions, so that the infinitely variable diameter hole on the variable diameter template is enlarged; Step 2, inserting the insertion rod into the positioning mechanism on the positioning base, so that the arc-shaped pressing blocks of the multiple squeezing small rods hold the bottom end of the insertion rod tightly, thereby achieving positioning and fixing of the bottom end of the insertion rod; Step 3, toggle the adjustment paddle again to make the multiple toothed slides move toward each other, and the stepless variable diameter hole on the variable diameter template is reduced until the multiple toothed slides are in contact with the upper part of the insertion rod, thereby achieving positioning and fixing of the upper part of the insertion rod; Step 4, injecting wet material required for forming the perforated test block into the preparation mold from the gap between the insertion rod and the infinitely variable diameter hole on the variable diameter mold; Step 5, after the wet material solidifies, a demoulding air pump is used to connect the first vent hole to introduce gas into the preparation mold; then the insertion rod is removed from the test block with holes, and the positioning base, the mold box and the variable diameter template are separated from each other, thereby taking out the prepared test block with holes; Step 6: Clean the positioning base, mold box, reducer template and insert rod for reuse.

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