Forming die for plasterboard with porous structure

Abstract

The utility model relates to the technical field of plasterboard section dies, in particular to a forming die of a plasterboard with a porous structure, which comprises an upper die, a lower die and a plurality of forming rods, the upper die is oppositely combined with the lower die to form a closed cavity, the plurality of forming rods penetrate through threads to be connected with the upper die and the lower die, the upper ends of the forming rods are big, and the transition surfaces of the upper ends and the lower ends are inclined surfaces. A taper thread is arranged on the inclined surface; the upper die and the lower die are provided with through holes allowing the forming rods to penetrate through, gaps are formed between the tops of the through holes and the upper ends of the forming rods, and the bottoms of the through holes are in threaded fit with the taper threads. A flow guide groove is formed in the taper thread in a penetrating mode and communicates with the gap and the closed cavity. The forming die can solve the problems that the size of a gypsum board hole deviates and the maintenance cost is increased due to the fact that threads of an existing forming die are prone to abrasion.

Description

Technical Field

[0001] This utility model relates to the field of gypsum board molding technology, specifically to a molding die for porous gypsum board. Background Technology

[0002] Currently, gypsum board is widely used as an interior decorative panel. It is a material made primarily from building gypsum. It is a lightweight, high-strength, thin, and easy-to-process building material with good sound insulation, heat insulation, and fire resistance properties, making it one of the new lightweight panel materials currently under development. In some special applications, such as sound-absorbing panels, gypsum board with perforations on its surface is required.

[0003] The existing patent application number CN201621449712.2 discloses a molding die for gypsum board with perforations on the surface. The molding rod is connected to the die by a gradually increasing thread (the thread height gradually increases from the top to the bottom of the molding rod), so that the bottom of the molding rod fits the die and the top of the molding rod forms a gap with the die. By injecting a release agent into the gap, the release agent flows into the die along the gap, which facilitates the demolding of the gypsum board. However, after the molding rod is rotated and withdrawn frequently, the small thread contact surface and high local pressure can easily cause thread wear, resulting in a decrease in fitting accuracy. This leads to deviations in the size of the holes on the gypsum board. Moreover, after long-term use, the thread fails, requiring frequent replacement of the molding rod, which increases maintenance costs. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a molding die for porous gypsum board, so as to solve the problem that the threads of the existing molding die are easily worn, resulting in deviations in the size of the holes in the gypsum board and increased maintenance costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A molding die for porous gypsum board includes an upper die, a lower die, and multiple molding rods. The upper die engages with the lower die to form a closed cavity. The multiple molding rods are threadedly connected to the upper and lower dies. Each molding rod has a larger upper end and a smaller lower end, and the transition surface between the upper and lower ends is an inclined surface with a tapered thread. The upper and lower dies have through holes for the molding rods to pass through. The top of the through hole forms a gap with the upper end of the molding rod, and the bottom of the through hole is threaded with the tapered thread. A guide groove is provided through the tapered thread, and the guide groove connects the gap with the closed cavity.

[0007] As an optional solution, the upper end of the forming rod is provided with a pin hole extending radially through it.

[0008] As an optional solution, the angle between the inclined surface and the axial direction of the forming rod is 5°-10°.

[0009] As an optional feature, the tapered thread surface is coated with a wear-resistant coating.

[0010] As an optional solution, the cross-sectional shape of the through hole is an inverted trapezoid.

[0011] As an optional solution, a sealing ring is provided in the gap.

[0012] As an optional solution, multiple guide channels are provided along the circumference of the forming rod, and each guide channel extends along the inclined direction of the inclined surface.

[0013] By adopting the above technical solution, this utility model has the following beneficial effects:

[0014] This utility model provides a molding die for porous gypsum board, which adopts a tapered thread design. This design generates radial clamping force when the molding rod is screwed in, dispersing the load on the thread contact surface, reducing local wear, and extending the service life of the thread. The guide groove connects the gap and the sealed cavity, guiding the release agent to evenly cover the contact surface between the molding rod and the gypsum, avoiding release agent retention or uneven distribution. In addition, due to the self-tightening characteristic of the tapered thread, as long as the distance from the tapered thread to the lower end face of all molding plates is consistent, no adjustment is needed when tightening the molding rod. This ensures that the extension length of each molding rod is the same, allowing for faster preparation for forming holes of the same depth.

[0015] Compared with existing molding molds that only use the high thread section of the gradient thread for thread connection, this utility model designs the entire inclined surface as a tapered thread, which can significantly reduce the risk of thread wear, improve demolding efficiency and hole forming consistency, and, together with the guide groove, facilitate the smooth demolding of gypsum board. Attached Figure Description

[0016] Figure 1 This is a perspective view of the forming rod of the forming mold for the porous gypsum board according to an embodiment of the present invention;

[0017] Figure 2 for Figure 1 Side view of the molding die for the porous gypsum board described in the embodiment;

[0018] Figure 3 for Figure 2 Sectional view at point A in the middle.

[0019] Reference numerals: 1. Upper mold; 11. Grouting hole; 2. Lower mold; 3. Forming rod; 31. Tapered thread; 32. Guide groove; 33. Pin hole; 4. Gap; 5. Plasterboard; 6. Sealing ring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Please refer to Figure 1-3 In one embodiment of the molding die for a porous gypsum board provided by this utility model, the molding die for the porous gypsum board includes an upper mold 1, a lower mold 2 and a plurality of molding rods 3; wherein, the upper mold 1 and the lower mold 2 are aligned vertically, one end is pivotally connected, and the other end is detachably connected by a locking buckle, and the upper mold 1 and the lower mold 2 form a closed cavity after being closed, and an injection hole 11 communicating with the closed cavity is fixedly installed at the center of the surface of the upper mold 1 for injecting gypsum slurry into the closed cavity, and the plurality of molding rods 3 are evenly distributed on the upper mold 1 and the lower mold 2, and each molding rod 3 is threadedly connected to the upper mold 1 or the lower mold 2.

[0024] Importantly, all forming rods 3 are of uniform length and are stepped rod-like structures with a larger upper end and a smaller lower end. The transition surfaces at the upper and lower ends of all forming rods 3 have the same displacement and are all inclined surfaces. The angle between the inclined surface and the axial direction of the forming rod 3 can be set to 5°-10°. A tapered thread 31 is integrally wound and connected on the inclined surface. The upper mold 1 and the lower mold 2 have through holes for the forming rods 3 to pass through. The cross-sectional shape of the through hole is an inverted trapezoidal shape. The top of the through hole forms an annular gap 4 with the upper end of the forming rod 3, and the bottom of the through hole is threaded with the tapered thread 31. The tapered thread 31 is provided with multiple guide grooves 32 along the circumference of the forming rod 3. The number of guide grooves 32 is preferably two, symmetrically distributed on both sides of the forming rod 3. The guide grooves 32 extend along the inclined direction of the inclined surface, and the upper and lower ends are aligned with the upper and lower edges of the inclined surface, respectively, and connect the aforementioned gap 4 with the sealed cavity. The release agent enters through the gap 4 and flows through the guide channel 32 to the contact surfaces of the forming rod 3 with the upper mold 1 and the lower mold 2, as well as the lower end surface of the forming rod 3. Because the tapered structure of the tapered thread 31 generates radial pressure during tightening, the load is evenly distributed on the contact surface of the thread teeth, reducing local stress concentration. This uniform force distribution slows down single-point wear during frequent rotation and unwinding. Furthermore, when subjected to axial force, the taper of the tapered thread 31 converts part of the axial force into radial clamping force, reducing sliding friction between the threaded pairs and further delaying wear.

[0025] It should be noted that the parallel cylindrical structure of straight threads is prone to stress concentration at the root of the thread, and repeated rotation and withdrawal can easily lead to wear of the thread tip. Moreover, when subjected to axial force, straight threads mainly rely on mechanical fastening, and the axial force acts directly on the thread surface, which aggravates wear. In addition, straight threads do not have the self-tightening characteristics of tapered threads 31 (it is necessary to adjust the forming rod 3 to a suitable height to obtain a cavity that meets the depth requirements). Therefore, the conventional straight thread design used in this example cannot achieve the effect of tapered threads 31.

[0026] Preferably, a sealing ring 6 can be provided in the gap 4. The sealing ring 6 is interference-fitted with the gap 4 to prevent the gypsum slurry from flowing out. The top of the sealing ring 6 is exposed in the gap 4, making it easy to remove when the release agent is injected.

[0027] Preferably, a pin hole 33 can be provided radially through the upper end of the molding rod 3. When it is necessary to tighten the molding rod 3, a pin is inserted into the pin hole 33, and the molding rod 3 is rotated by the pin, which makes the operation easier and more convenient. When it is necessary to inject release agent into the gap 4 or install the sealing ring 6, the pin is pulled out to avoid affecting the operation.

[0028] Preferably, a wear-resistant coating can be applied to the surface of the tapered thread 31. The wear-resistant coating is tungsten carbide, which has a hardness of HV1200 or higher, close to that of diamond, and can effectively resist wear during the thread engagement process. In addition, tungsten carbide has high stability and can resist corrosive media such as acids, alkalis, and salts, and can still maintain its performance at a high temperature of 850℃.

[0029] The method of use or working principle of this utility model is as follows:

[0030] In use, first open the upper mold 1 and the lower mold 2, and tighten the forming rod 3. Due to the self-tightening characteristic of the tapered thread 31, no adjustment is required before tightening, even if the lengths of each forming rod 3 are the same. Then, apply a release agent to the inner walls of the upper mold 1 and the lower mold 2, and then close the upper mold 1 and the lower mold 2 to form a sealed cavity inside. Next, inject the release agent into the gap 4 and install the sealing ring 6. Then, inject gypsum slurry into the sealed cavity through the injection hole 11 and wait for the gypsum slurry to solidify. After the gypsum slurry solidifies, pull out the sealing ring 6 and loosen the forming rod 3 to detach it from the gypsum board 5, thus leaving a hole in the gypsum board 5. Finally, separate the upper mold 1 and the lower mold 2 to complete the demolding.

[0031] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A molding die for porous gypsum board, comprising an upper die (1), a lower die (2), and a plurality of molding rods (3), wherein the upper die (1) engages with the lower die (2) to form a closed cavity, and the plurality of molding rods (3) are threadedly connected to the upper die (1) and the lower die (2), characterized in that, The forming rod (3) is larger at the top and smaller at the bottom, and the transition surface between the top and bottom is an inclined surface. A tapered thread (31) is provided on the inclined surface. The upper mold (1) and the lower mold (2) are provided with through holes for the forming rod (3) to pass through. A gap (4) is formed between the top of the through hole and the upper end of the forming rod (3). The bottom of the through hole is threaded with the tapered thread (31). A guide groove (32) is provided through the tapered thread (31). The guide groove (32) connects the gap (4) and the sealed cavity.

2. The molding die for porous gypsum board as described in claim 1, characterized in that, The upper end of the forming rod (3) is provided with a pin hole (33) extending radially through it.

3. The molding die for porous gypsum board as described in claim 1, characterized in that, The angle between the inclined surface and the axial direction of the forming rod (3) is 5°-10°.

4. The molding die for porous gypsum board as described in claim 1, characterized in that, The tapered thread (31) is coated with a wear-resistant coating.

5. The molding die for porous gypsum board as described in claim 1, characterized in that, The cross-sectional shape of the through hole is an inverted trapezoid.

6. The molding die for porous gypsum board as described in claim 1, characterized in that, A sealing ring (6) is provided inside the gap (4).

7. The molding die for porous gypsum board as described in claim 1, characterized in that, The guide groove (32) is provided in multiple directions along the circumference of the forming rod (3), and each guide groove (32) extends along the inclined direction of the inclined surface.

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