Mechanical pressing forming press machine and light brick manufacturing method

Abstract

The invention relates to the technical field of refractory light bricks, in particular to a mechanical pressing press machine and a light brick manufacturing method. The preparation method comprises the following steps: carrying out dry mixing on raw materials containing vitrified micro bubbles, dextrin and the like, adding water accounting for 13-18% of the total weight, carrying out wet mixing, and ageing; pug is flatly laid and pushed into a forming mold through a quantitative material distribution mechanism of a press machine, an upper pressing head is limited to conduct fixed-distance pressing through a fixed-distance control assembly, and light brittle aggregate is prevented from being crushed; and after demolding, high-temperature firing is carried out according to a heating curve provided with a low-temperature slow exhaust pore-forming stage. The matched press machine comprises a material storage bin, a quantitative material distribution mechanism, a forming mold, a fixed-stroke pressurization executing mechanism and a demolding mechanism. A traditional extrusion cutting and grinding process is abandoned, cutting-grinding-free one-time forming is achieved, the problems of fragile aggregate preservation, high-moisture mold sticking and bursting are effectively solved, and the high-strength low-heat-conduction light brick is prepared at low cost.

Description

Technical Field

[0001] This invention relates to the field of refractory lightweight brick technology, and more specifically, to a machine pressing press and a method for manufacturing lightweight bricks. Background Technology

[0002] Refractory lightweight bricks, as an important energy-saving building material and industrial kiln lining material, play a vital role in energy conservation and consumption reduction in kilns in industries such as metallurgy, chemical industry, and building materials due to their advantages such as low bulk density and good thermal insulation performance.

[0003] For a long time, the production process of medium- and high-grade high-temperature resistant insulating refractory bricks used in various industrial kilns in China has mostly followed the traditional poly-lightweight cutting and grinding process. This process is extremely complex, typically requiring sequential steps such as batching, mixing and kneading the clay, extruding the clay strips, cutting the bricks, drying, and firing. Furthermore, due to the uncontrollable shrinkage and deformation during extrusion and firing, the fired bricks must undergo tedious cutting and grinding in three dimensions—length, width, and thickness—to obtain finished products that meet dimensional tolerance requirements. This process is not only time-consuming and has a low yield rate, but the later cutting and grinding processes also generate a large amount of waste and dust, resulting in enormous energy consumption, completely deviating from the green production concept of modern energy-saving building materials.

[0004] To overcome the shortcomings of the aforementioned extrusion and grinding process, the industry has also attempted to use mechanical presses for molding. For example, patent CN106673678B discloses a mullite lightweight insulating brick and its preparation method, which uses raw materials including calcite and binders, and explicitly proposes to use a semi-dry pressing method to prepare the lightweight insulating brick.

[0005] However, existing semi-dry press molding technologies, represented by this prior art document, face challenges in achieving extremely low thermal conductivity (e.g., ≤0.28 W / (m·K)) and ultra-low bulk density (e.g., ≤1.0 g / cm³). 3 When producing modern energy-saving lightweight bricks, the following technological problems were exposed: First, in order to achieve excellent heat insulation effect, a large amount of lightweight porous aggregates such as vitrified microspheres must be added to the raw materials. The shell of these hollow aggregates is extremely brittle and has very low compressive strength. Existing conventional semi-dry pressing equipment applies rigid high pressure during pressing, which causes the vitrified microspheres in the clay to be crushed on a large scale in the mold, thus completely losing the original microporous heat insulation structure. As a result, the thermal conductivity of the fired bricks is seriously exceeded. If the molding pressure is reduced unilaterally in order to protect the aggregates, the density of the brick blank will be insufficient, and the room temperature compressive strength after sintering will not be able to reach the standard of 8MPa or above.

[0006] Secondly, traditional semi-dry press molding (as mentioned in the comparative document above) typically requires extremely low moisture content in the mixture (generally around 5%-8%). However, for composite lightweight formulations containing various fine powders, dextrin, and vitrified microspheres, the moisture content of the clay often needs to reach 13%-18% in order to achieve sufficient molding plasticity and form buffer bridges that encapsulate the microspheres. If such high-moisture-content wet clay is directly applied to existing conventional press equipment, it is very easy to cause uneven material distribution, severe sticking to the mold, or even slurry splashing and other operational failures, making continuous automated production impossible.

[0007] Therefore, how to break free from the constraints of traditional lightweight grinding and cutting processes, while overcoming the shortcomings of existing conventional machine pressing technology in preserving lightweight aggregates and adapting to high moisture content, is an urgent problem to be solved in the current field of energy-saving building materials production. Summary of the Invention

[0008] The purpose of this invention is to provide a machine-pressed molding press and a method for manufacturing lightweight bricks, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, on the one hand, the present invention provides a machine pressing press for the production of lightweight bricks containing high moisture content and lightweight porous aggregate, including a frame, and a storage bin, a quantitative material distribution mechanism, a forming mold, a pressure execution mechanism and a demolding mechanism disposed on the frame; The quantitative feeding mechanism, located below the storage silo, is configured as a volumetric quantitative feeding assembly. It is used to uniformly push wet-mixed lightweight billets with a moisture content of 13%-18% into the molding die according to a set volume, thereby controlling the bulk density of the fired lightweight bricks to be ≤1.0 g / cm³. 3 ; The pressurizing actuator includes a press head located above the forming mold and a fixed stroke control component. The press head moves downwards for a set pressing stroke under the restriction of the fixed stroke control component to perform a fixed stroke press forming on the wet mixed lightweight billet in the forming mold, so as to avoid large-area cracking of the lightweight and brittle pore-forming aggregate in the billet due to high pressure. The demolding mechanism is located at the bottom of the forming mold and is used to eject the brick blank formed in one step.

[0010] On the other hand, the present invention also provides a method for manufacturing lightweight bricks using the machine pressing press described above, comprising the following steps: S1. Dry mixing: Weigh the raw materials according to the set weight ratio. The raw materials include mullite powder, calcium aluminate powder, fly ash, bauxite powder, high-quality clay, micro powder, calcined alumina powder, as well as dextrin and vitrified microspheres as lightweight pore-forming aggregates, and put them into the mixer for dry mixing. S2. Wet mixing: Add water (13%-18% of the total weight of raw materials) to the dry-mixed mixer and stir to form a colloidal film with the hydrated high-quality clay and dextrin and uniformly coat the surface of the vitrified microspheres; after stirring evenly, feed the material into the storage silo for conditioning. S3, machine pressing: Using a quantitative material distribution mechanism, the trapped mud is quantitatively spread and pushed into the molding mold. The upper pressure head of the pressure actuator is used to press downward in a fixed stroke to avoid damaging the lightweight and brittle pore-forming aggregate inside the wet-mixed lightweight blank during the pressing process, so as to form a molded brick blank, which is then ejected by the demolding mechanism. S4. High-temperature firing: The molded brick blanks after demolding are put into the kiln, and with the addition of 13%-18% water and the steady volatilization of dextrin, they are fired according to the temperature rise curve of the low-temperature slow exhaust and hole-forming stage. The highest firing temperature is ≥1400℃. After holding at the temperature for a set time, they are cooled and removed from the kiln to obtain the finished lightweight bricks.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: This machine-pressed lightweight brick manufacturing method firstly changes the traditional extrusion and grinding processes. Through volumetric quantitative material distribution and fixed-stroke pressure, it achieves direct one-time machine pressing of lightweight brick blanks, ensuring the finished bricks meet dimensional requirements immediately upon exiting the kiln. This reduces dust and waste generated from grinding, lowering manufacturing costs by approximately 30% compared to traditional grinding processes. Secondly, by introducing a fixed-stroke control component into the pressure actuator, combined with wet mixed clay containing 13%-18% moisture to form a liquid bridge buffer, it avoids the damage to lightweight porous aggregates such as vitrified microspheres caused by conventional rigid high pressure. This ensures the finished product maintains a good microporous structure, reducing the thermal conductivity to ≤0.28W / (m·K). Simultaneously, the dedicated quantitative material distribution mechanism overcomes the problem of high-moisture clay easily sticking to the mold. The 13%-18% water content ensures sufficient hydration of the powder and binder, encapsulating the aggregates. After firing at ≥1400℃, the lightweight bricks achieve a bulk density of ≤1.0g / cm³. 3 Under certain conditions, the compressive strength at room temperature can reach ≥8MPa. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the machine pressing press according to an embodiment of the present invention; Figure 2 This is a process flow diagram of the lightweight brick manufacturing method according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the temperature rise curve during high-temperature firing according to an embodiment of the present invention.

[0013] The meanings of the labels in the diagram are as follows: 1. Frame; 2. Storage bin; 3. Quantitative material distribution mechanism; 4. Molding mold; 5. Pressurization actuator; 51. Hydraulic cylinder; 52. Stroke control component; 53. Upper pressure head; 6. Demolding mechanism. Detailed Implementation

[0014] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Combination Figure 1 As shown, the present invention provides a machine pressing press specifically for the production of lightweight bricks, including a frame 1. A storage bin 2 is fixedly installed on the top of one side of the frame 1. A quantitative material distribution mechanism 3 is slidably arranged below the discharge port of the storage bin 2. A forming mold 4 is provided on the working table in the middle of the frame 1. The quantitative material distribution mechanism 3 can move horizontally to directly above the forming mold 4 under the drive of the transmission mechanism to perform volumetric quantitative material distribution, so as to adapt to wet mixed lightweight billets with a moisture content of 13%-18%.

[0016] A pressure-applying actuator 5 is provided directly above the forming mold 4. The pressure-applying actuator 5 includes a hydraulic cylinder 51 fixed to the top of the frame 1 and an upper pressure head 53 connected to the output end of the hydraulic cylinder. Specifically, a stroke control component 52, such as a displacement sensor or a mechanical limit block, is arranged on the side of the hydraulic cylinder 51. During pressing, the hydraulic cylinder 51 drives the upper pressure head 53 to move downward. When the stroke control component 52 detects that the upper pressure head 53 has reached the set lower limit of the safe stroke, it sends a signal to stop the hydraulic cylinder 51 from pressing down and to maintain pressure, so as to prevent the brittle vitrified microspheres in the billet from breaking in a large area due to continued pressure.

[0017] The bottom of the molding die 4 is also provided with an upward ejection mechanism 6, which is used to automatically eject the molded brick blank with initial strength from the mold cavity after pressing.

[0018] The lower limit of the stroke set by the fixed-stroke control component is based on the single-batch feeding weight of the volumetric quantitative feeding mechanism and the bulk density of the target lightweight brick (≤1.0 g / cm³). 3 By rigorous reverse engineering, it was found that, due to the constant weight of the fabric, when the upper pressure head descends to the point where the remaining space in the mold cavity reaches the theoretical volume required for the target density, the fixed-stroke control component triggers a shutdown and pressure holding mechanism. This control logic based on the final fixed stroke ensures that the pressure head stops working precisely when it has just squeezed out the air between the powder particles and has not yet generated destructive compressive stress on the hollow vitrified microspheres. This allows for stable production with high yield without the need for repeated trial and error.

[0019] Combination Figure 2 As shown in the embodiment of the present invention, a method for producing lightweight bricks using the above-mentioned equipment is provided. The raw materials, by weight, are: 20-30 parts mullite powder; 15-25 parts calcined alumina powder; 10-20 parts bauxite powder; 10-20 parts vitrified microspheres; 10-15 parts high-quality clay; 5-10 parts fly ash; 3-8 parts micro powder; 2-5 parts calcium aluminate powder; 1-3 parts dextrin; the total weight of the above dry-mixed raw materials is 100 parts, and the amount of water added is 13%-18% of the total weight of the dry-mixed raw materials.

[0020] The method includes the following steps: S1. Dry mixing: Put the above raw materials into the mixer and dry mix them evenly.

[0021] S2. Wet mixing and curing: Add water accounting for 13%-18% of the total weight of the dry mixed raw materials, stir evenly, and then put it into the storage silo for curing for 12-24 hours. The present invention uses this high water content but does not cause the machine to stick to the mold or collapse. The mechanism is that: after the dextrin and high-quality clay in the formula fully absorb water and are cured, they form a high-viscosity colloidal film that is uniformly wrapped on the surface of the vitrified microspheres, forming a flexible liquid bridge buffer layer. When subjected to fixed-stroke pressing (the lower limit of the fixed-stroke pressing stroke is set to: when the upper pressure head 53 reaches the lower limit of the stroke, the ratio of the weight of the blank pushed into the molding mold (4) in one go to the volume of the blank compressed in the molding mold (4) is equal to the set target finished lightweight brick volume density), the liquid bridge plays a lubricating role to prevent sticking to the mold and locks the aggregate, so that the wet brick blank after one molding has a high wet blank strength.

[0022] S3, Machine Press Molding: The quantitative material feeding mechanism is activated to inject material into the molding mold, and the brick blank is formed by a fixed-stroke pressing process and automatically demolded.

[0023] S4. High-Temperature Firing: The shaped brick blanks are fired in the kiln. To accommodate the high moisture content and the pore-forming properties of dextrin, the heating curve employs a slow venting and pore-forming process at a rate of 2-3℃ / min from room temperature to 600℃; and a rate of 4-5℃ / min from 600℃ to 1000℃. The mechanism is as follows: slow venting effectively avoids internal stress concentration and brick blank cracking caused by violent moisture vaporization, while dextrin slowly volatilizes to create pores; subsequently, the temperature is raised to the maximum firing temperature of ≥1400℃ and held for 3-4 hours, causing solid-phase sintering of the material to form a solid skeleton. After cooling, the finished product is obtained.

[0024] Example 1: A method for manufacturing lightweight bricks, comprising the following steps: S1. Dry mixing: Weigh the following raw materials in parts by weight: 25 parts mullite powder, 20 parts calcined alumina powder, 15 parts bauxite powder, 10 parts vitrified microspheres, 12 parts high-quality clay, 10 parts fly ash, 4 parts micro powder, 3 parts calcium aluminate powder, and 1 part dextrin. Put the above raw materials into the mixer and dry mix them evenly.

[0025] S2. Wet mixing: Add water, which accounts for 13% of the total weight of the dry mixed raw materials, into the mixer and stir for 1-2 minutes to fully mix the powder, water and dextrin, forming a buffer bridge on the surface of the vitrified microspheres. After stirring evenly, input it into the storage hopper of the press for later use.

[0026] S3. Machine pressing: Start the quantitative material feeding carriage, based on a bulk density of 1.0 g / cm³. 3 The process involves setting the material volume, injecting wet clay into the molding mold, starting the press head to press down at a fixed stroke, and forming a rectangular brick blank in one go. The brick blank is then automatically demolded. The entire pressing process is free of mud splashing, and the edges and corners of the brick blank are intact and do not crumble.

[0027] S4. High-temperature firing: The shaped brick blanks are pushed into the tunnel kiln and heated according to the set heating curve. The maximum firing temperature is set to 1400°C. After holding at this temperature for 4 hours, the bricks are cooled with the kiln.

[0028] Performance testing: The lightweight brick prepared in Example 1 was tested and found to have a bulk density of 0.98 g / cm³. 3 It has a room temperature pressure resistance of 8.8 MPa, a thermal conductivity of 0.27 W / (m·K), and its permanent linear deformation under heating meets the standard requirements.

[0029] Example 2 S1. Dry mixing: Accurately weigh the following raw materials in parts by weight: 22 parts mullite powder, 18 parts calcined alumina powder, 15 parts bauxite powder, 15 parts vitrified microspheres, 14 parts high-quality clay, 8 parts fly ash, 4 parts micro powder, 2 parts calcium aluminate powder, and 2 parts dextrin.

[0030] S2. Wet mixing: Add water accounting for 15% of the total weight of the dry mixed raw materials, stir for 2 minutes, and put it into the storage silo for later use.

[0031] S3. Machine pressing: The material is injected into the forming mold through a quantitative feeding mechanism, and the brick blank is formed in one go using a fixed-stroke pressing process.

[0032] S4. High-temperature firing: The shaped brick blanks are put into the kiln, and the maximum firing temperature is set to 1420℃. After holding at the temperature for 4 hours, they are cooled and removed from the kiln.

[0033] Performance testing: The lightweight brick prepared in Example 2, due to its moderate proportion of vitrified microspheres and an excellent water-to-material ratio, exhibited a highly developed microporous structure and a robust framework, with a measured bulk density of 0.92 g / cm³.3 It has a room temperature pressure resistance of up to 9.5 MPa and a thermal conductivity that drops to 0.25 W / (m·K).

[0034] Example 3 S1. Dry mixing: Accurately weigh the following raw materials in parts by weight: 20 parts mullite powder, 15 parts calcined alumina powder, 12 parts bauxite powder, 18 parts vitrified microspheres, 15 parts high-quality clay, 9 parts fly ash, 6 parts micro powder, 2 parts calcium aluminate powder, and 3 parts dextrin.

[0035] S2. Wet mixing: Add water accounting for 18% of the total weight of the dry mixed raw materials and stir for 2 minutes. The high water content ensures that a high proportion of vitrified microspheres and fly ash can be fully wetted and bonded.

[0036] S3, Machine Press Molding: Material is injected smoothly through a quantitative material feeding mechanism, and then formed in one step using a fixed-stroke flexible pressing method.

[0037] S4. High-temperature firing: The product is placed in a kiln and fired at a maximum temperature of 1450℃. After holding at this temperature for 3 hours, it is cooled and removed from the kiln. During this process, the dextrin is completely burned off, leaving behind uniform micropores.

[0038] Performance testing: The lightweight brick prepared in Example 3 was found to be extremely lightweight, with a measured bulk density of 0.88 g / cm³. 3 It has a room temperature compressive strength of 8.2 MPa and an extremely low thermal conductivity of 0.25 W / (m·K).

[0039] Comparative Example 1: The formula is the same as in Example 2, but the amount of water added is reduced to 8%, which is commonly used in traditional machine pressing processes.

[0040] Results: Due to the presence of a large amount of lightweight vitrified microspheres and fly ash, the clay material appears as dry powder at 8% moisture content, which cannot form effective encapsulation and liquid bridges. When pressed under constant pressure, the brick blanks cannot be bonded and formed, and severe disintegration occurs during demolding, making subsequent firing impossible.

[0041] Comparative Example 2: The formula and water content (15%) are exactly the same as in Example 2. However, during machine pressing, a conventional constant high pressure pressing method is used, and the stroke control component is not used to limit the stroke.

[0042] Results: Under rigid high pressure, the vitrified microspheres inside the clay exhibited a distinct cracking sound and underwent large-scale rupture. The bulk density of the fired bricks increased dramatically to 1.35 g / cm³. 3 The thermal conductivity increases to 0.42 W / (m·K), completely losing the thermal insulation performance of lightweight insulating bricks.

[0043] The finished bricks obtained in Examples 1-3 and Comparative Examples 1-2 were tested, and the data are shown in Table 1 below: Table 1 According to Table 1, the machine-pressed molding press and manufacturing method of the present invention produce lightweight bricks with a bulk density ≤1.0 g / cm³. 3 With a thermal conductivity of ≤0.28W / (m·K), its room temperature compressive strength (≥8MPa) significantly surpasses that of traditional lightweight cutting and grinding bricks (only 3-5MPa), achieving one-time molding without cutting and grinding, greatly reducing manufacturing costs, and possessing extremely high industrial application value.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing lightweight bricks, characterized in that, Includes the following steps: S1. Dry mixing: Weigh the raw materials according to the set weight ratio. The raw materials include high-quality clay, dextrin and vitrified microspheres as lightweight and brittle pore-forming aggregate. Put all the raw materials into the mixer for dry mixing. S2, Wet mixing: Add water of 13%-18% of the total weight of the raw materials to the dry mixing machine and stir to form a colloidal film with the hydrated high-quality clay and dextrin and uniformly coat the surface of the vitrified microspheres; after stirring evenly, input the mixture into the storage silo (2) for stabilization; S3, machine pressing: using a quantitative material distribution mechanism (3), the mud material after being trapped is quantitatively spread and pushed into the molding mold (4), and the upper pressure head (53) of the pressure execution mechanism (5) is used to press downward in a fixed stroke to avoid damaging the lightweight and brittle pore-forming aggregate inside the wet-mixed lightweight blank during the pressing process, so as to form a molded brick blank, which is then ejected by the demolding mechanism (6). S4. High-temperature firing: The molded brick blanks after demolding are put into the kiln, and with the addition of 13%-18% water and the steady volatilization of dextrin, the brick blanks are fired according to the temperature rise curve of the low-temperature slow exhaust and hole-forming stage to avoid the brick blanks from cracking due to violent vaporization of high moisture. The maximum firing temperature is ≥1400℃. After heat preservation and cooling, the finished lightweight bricks are obtained.

2. The method for manufacturing lightweight bricks according to claim 1, characterized in that, The dry-mixed raw materials in S1, by weight, include the following components: 20-30 parts mullite powder, 15-25 parts calcined agate powder, 10-20 parts bauxite powder, 10-20 parts vitrified microspheres, 10-15 parts high-quality clay, 5-10 parts fly ash, 3-8 parts micro powder, 2-5 parts calcium aluminate powder, 1-3 parts dextrin. The total weight of the above dry-mixed raw materials is 100 parts.

3. The method for manufacturing lightweight bricks according to claim 1, characterized in that, In step S2, the wet mixing time is 2-3 minutes to ensure that the moisture fully penetrates and forms a flexible liquid bridge buffer layer between the powder and the aggregate; the settling time is 12-24 hours.

4. The method for manufacturing lightweight bricks according to claim 1, characterized in that, In S3, the lower limit of the stroke of the fixed-stroke pressing is set as follows: when the upper pressing head (53) reaches the lower limit of the stroke, the ratio of the weight of the blank pushed into the forming mold (4) in a single stroke to the volume of the blank compressed in the forming mold (4) is equal to the set target finished lightweight brick volume density; when the pressing reaches the lower limit of the stroke, the pressure is maintained for 2-5 seconds.

5. The method for manufacturing lightweight bricks according to claim 1, characterized in that, In S4, the heating curve specifically includes: Slow venting and pore formation are carried out at a heating rate of 2-3℃ / min in the stage from room temperature to 600℃; a heating rate of 4-5℃ / min is used in the stage from 600℃ to 1000℃; then the temperature is raised to the highest firing temperature of ≥1400℃ and held for 3-4 hours for solid-state sintering.

6. The method for manufacturing lightweight bricks according to claim 1, characterized in that, In step S4, after the shaped brick blanks have completed solid-phase sintering and heat preservation in the kiln, they are naturally cooled to room temperature and then removed from the kiln. The finished lightweight bricks after being removed from the kiln are directly used as the final product without any surface length, width, or thickness cutting or grinding processes.

7. A machine pressing press for the production method of lightweight bricks as described in any one of claims 1-6, characterized in that, It includes a frame (1), and a storage bin (2), a quantitative material distribution mechanism (3), a molding die (4), a pressure actuation mechanism (5), and a demolding mechanism (6) disposed on the frame (1); The quantitative fabric spreading mechanism (3) is slidably disposed below the discharge port of the storage bin (2) and configured as a volumetric fabric spreading assembly for adapting to the quantitative flat spreading of wet mixed lightweight billets with a moisture content of 13%-18%. The pressurizing actuator (5) includes a hydraulic cylinder (51) and an upper pressure head (53) located above the molding die (4). A stroke control component (52) is arranged beside the hydraulic cylinder (51). The stroke control component (52) is used to limit the downward pressing stroke of the upper pressure head (53) so that the upper pressure head (53) triggers the hydraulic cylinder (51) to stop pressing and hold pressure when it reaches the set lower limit of the stroke.

8. The machine pressing press according to claim 7, characterized in that, The quantitative material feeding mechanism (3) is a material feeding trolley that can move horizontally back and forth directly above the forming mold (4). The material feeding trolley is equipped with a volume adjustment structure for adjusting the volume of material fed in a single operation.

9. The machine pressing press according to claim 7, characterized in that, The fixed-range control component (52) is a high-precision mechanical limit stop or displacement sensor.

10. The machine pressing press according to claim 7, characterized in that, The demolding mechanism (6) is an ejection cylinder or hydraulic cylinder located at the bottom of the molding mold (4), used to smoothly eject the molded brick blank after the pressure holding is completed.

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