A Lego hollow brick forming machine

Abstract

A Lego hollow brick forming machine is characterized in that it includes a base platform, a hopper, a feeding conveyor belt, an upper crossbeam, a movable crossbeam I, a movable crossbeam II, a machine column, a main hydraulic cylinder, an upper punch, a lower punch, a groove, a hydraulic cylinder IV, a core, a metal sheet, and a stacking table. The invention uses a novel three-stage pressing method to greatly improve the stability of high-hollow Lego blocks, so that the height error of the produced blocks is small. At the same time, under the objective condition that the error of the feeding amount in the block volume ratio stage is relatively high (±(2÷4)% of the average mass of the blocks), the pressure in the final pressing stage can be adjusted and other quality parameters of the blocks, such as firmness and frost resistance, can be guaranteed.

Description

Technical Field

[0001] The invention relates to a Lego hollow brick forming machine. Background Art

[0002] Traditional pressing methods, such as vibration pressing, are to place a single portion of bulk raw material into a closed die, use the pressure of one or two punches to press, and then push the pressed block out of the die and transport it to the hardening stage. The disadvantage of this method is that the raw material placed in the die is fed by volume. However, there is an error in the amount of material fed, which is at least ±2% less than the amount of raw material that should be placed in the die. Even if the raw material properties are stable and effective volume proportioning tools are used, the error is difficult to avoid. In addition to this error, there is also the situation where the gap between the outer wall of the closed die and the punch leaks the raw material, resulting in errors. In a stable pressing process, the error in the amount of material will lead to deviations in the density of the block. The above errors seem small, but for most bulk raw materials, within the common pressure range, it will cause large or even unacceptable fluctuations in the block parameters. Density fluctuations will cause large (usually multiple) errors in pressure, and the error will increase as the pressure of the press continues to increase. Density fluctuations will cause fluctuations in various quality indicators of the formed blocks (firmness, frost resistance, etc.) during the above working operations. In order to ensure the stability of block manufacturing indicators and the minimum height error, the traditional pressing method can only be improved when the volumetric proportioning method has a high error. One solution to the above problem is to minimize the error value of the volumetric proportioning method. To achieve this goal, more effective methods and volumetric proportioning equipment are required, such as piling the bulk raw materials into the die in advance, compacting them with the pressure of a calibrated device, and then shoveling off the excess raw materials [1]. Similar to this method, the instability of the bulk raw materials, such as humidity and particle composition, can be used to reduce their proportioning error. However, the proportioning error rate after reduction will not be lower than ±2%.

[0003] Another solution is to stabilize the block density and molding pressure. By stabilizing the pressure value of the transmission device that controls the punch in the hydraulic system, the height of the molded block can be changed, thereby keeping the density and pressure stable, and indirectly reducing the error in the volume ratio of the material [2]. If the pressing process is completed before the set stable pressure value is reached, the density and the various block quality indicators mentioned above can be maintained, but the fluctuation of the block height will cause the error in the volume ratio of the material.

[0004] A more effective way is the error reduction method used by the prototype machine selected by the present invention, the bulk raw material hollow brick forming machine. This machine combines the above two solutions to improve the stability of the quality indicators of the formed blocks. This method includes the following steps: the raw materials that have been volume-proportioned are put into a closed die, and the bottom plate of the die is the lower punch; under the action of the motor, the core tool buried in the raw material moves from bottom to top and presses the excess raw material back to the proportioning device; compacting the raw material, first by the lower punch under the control of the hydraulic press, and then the upper punch punches into the raw material pile and moves in the opposite direction to the lower punch; using the core tool to pull and punch holes in the block; pushing the block out of the machine, and then grabbing it with a gripper and transporting it out for hardening, stacking, and shipping. Compared with other similar methods, this method used by the prototype is quite effective because it combines the advantages of both methods. This effect is achieved in the following two aspects: first, a core tool opposite to the lower punch is used in the filling stage; second, a set pressure q that is not less than the conventional pressure q that can ensure the quality indicators of the block is reached. HThe pressing process ends when the pressure reaches 100mm. However, when the prototype machine produces Lego blocks, especially Lego bricks with a height greater than 100mm, it is difficult not to have height deviations. Lego brick stacking has very strict requirements on height. For example, the height error of a 200mm block cannot exceed ±0.5mm, that is, ±0.25% of the block height, which is ten times smaller than the minimum error value of ±2% required for volume proportioning. If Lego bricks have a large error in height, it is tantamount to producing waste, because such bricks cannot be used. In this case, an intractable contradiction arises: in order to increase the utilization rate of Lego bricks, the height error must be guaranteed not to exceed ±0.5mm during production, while in order to ensure the stability of the machine pressure and other quality indicators of the blocks, a larger error value (±4mm) must be allowed in height, which is equivalent to the minimum error value allowed for volume proportioning of bulk raw materials. The current common practice to resolve this contradiction is to improve the quality of raw materials, thereby greatly improving the quality of blocks. In this way, even the lowest density blocks produced under the condition of the maximum negative feeding error will show normal quality parameters. In addition, it is necessary to ensure that the selected raw materials and the average pressure value have the least impact on the quality indicators. However, improving the quality of loose raw materials requires additional investment. If the raw materials are mainly astringent materials (usually cement), the production cost will be greatly increased, because cement is a more expensive raw material component, and better quality and more expensive fillers are required. If ceramic materials are used to produce Lego bricks, high-quality and expensive clay is required. It should be pointed out that even if the above method can be achieved (guaranteeing the specified size under the condition of minimum density and minimum pressure), it does not necessarily guarantee the solution to the above problem - to ensure the minimum height error. This is related to the elasticity of the ductility generated when compacting the raw materials. The pressure causes the high-density blocks to elastically flex, and their ductility is much higher than that of similar low-density blocks. Therefore, blocks with the same height after pressing will become blocks with different heights when pushed out. There is another important way to solve the above contradiction (that is, the contradiction between the minimum height error required by the prototype and the high volume ratio error) - leave room for processing when molding the blocks and then mill them after hardening and before stacking. However, the disadvantage of this method is that the milling cost is high, almost equivalent to the cost of molding high hollow Lego blocks. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems of the prior art and provide a hollow Lego brick forming machine with stable block density and accurate block height.

[0006] To achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a Lego hollow brick forming machine, characterized in that it includes a base platform, a hopper, a feeding conveyor belt, an upper crossbeam, a movable crossbeam I, a movable crossbeam II, a machine column, a main hydraulic cylinder, an upper punch, a lower punch, a groove, a hydraulic cylinder IV, a core, a metal sheet, and a stacking table; the machine column is provided with four mounted on the base platform; the movable crossbeam II, the movable crossbeam I, and the upper crossbeam are sequentially mounted on the machine column from bottom to top; the upper crossbeam is a fixed crossbeam; the main hydraulic cylinder is mounted on the upper crossbeam; the movable crossbeam I is connected to the push rod of the main hydraulic cylinder, and can move up and down along the machine column under the action of the main hydraulic cylinder; the lower end of the movable crossbeam I is connected to a plurality of upper punches; a pair of hydraulic cylinders I and a pair of hydraulic cylinders II are also mounted on the upper crossbeam; the piston rod of the hydraulic cylinder II is connected to the movable crossbeam I; the movable crossbeam II is connected to the piston rod of the hydraulic cylinder I, and the piston rod of the hydraulic cylinder I is connected to the piston rod of the hydraulic cylinder I. Under the action of , it can move up and down along the machine column; the groove is provided with several and is installed on the movable crossbeam II; the lower punch is provided with several and is installed on the base platform; the hydraulic cylinder IV is provided with several and is installed on the base platform; the core tool is installed in the groove; the core tool is connected to the hydraulic cylinder IV by a connecting rod; the core tool moves up and down in the groove under the action of the hydraulic cylinder IV; the metal sheet is installed on one side of the movable crossbeam II; the upper end surface of the metal sheet is flush with the upper end surface of the movable crossbeam II; a slide is placed on the metal sheet; the slide is connected to the hydraulic cylinder III and can move along the surface of the metal sheet under the action of the hydraulic cylinder III; the hydraulic cylinder III is installed and fixed on the movable crossbeam II; the hopper is installed above the metal plate for holding raw materials; a loading conveyor belt is arranged under the hopper for conveying the raw materials to the slide; the stacking table is installed on the other side of the movable crossbeam II.

[0007] Furthermore, a gripper is installed on the front wall of the slide.

[0008] Furthermore, the upper end surface of the groove, the upper end surface of the stacking platform, the upper end surface of the movable crossbeam II, and the upper end surface of the metal sheet are flush with each other.

[0009] Furthermore, the core tool is composed of an upper end, a middle part, and a lower end; the middle part is a part whose cross-sectional shape gradually changes; the upper end and the lower end are parts whose cross-sectional shapes are fixed; the cross-sectional size of the upper end is smaller than the cross-sectional size of the lower end, and the difference between the two is not less than 15%; the upper end and the lower end are connected by a transitional middle part; the lower punch has a middle opening I; the hole I is completely matched with the lower end; the upper punch has a hole II; the hole II is completely matched with the upper end; the upper punch and the lower punch are completely matched with the groove; the height of the middle part does not exceed 0.8 of the height of the Lego brick.

[0010] Furthermore, the number of the hydraulic cylinders IV, core tools, upper punches, lower punches, and grooves is equal; and each hydraulic cylinder IV acts independently.

[0011] A method for producing hollow Lego bricks comprises the following steps:

[0012] 1) Put the quantitative bulk raw materials with good ratio into the groove with core tool

[0013] 2) The groove, lower punch and core are kept stationary, and the upper punch descends 0.6-0.8 of the total stroke to perform the first stage of pressing the raw material in the groove.

[0014] 3) The groove, lower punch and upper punch are kept stationary, and thrust is applied to move the core upward to punch holes in the groove and perform the second stage of pressing.

[0015] 4) The lower punch, core and upper punch move towards each other at the same time to perform the third stage of pressing the raw material in the groove until the block in the groove reaches the required height for the hollow Lego block.

[0016] 5) Push the finished hollow Lego blocks out of the mold slot and onto the stacking table to complete the operation.

[0017] The thrust force for the core tool to move upward in step 3 must be set so that the distance the core tool moves upward is greater than zero, while ensuring that the core tool cannot contact the working surface of the upper punch after movement; the error of the well-proportioned quantitative bulk raw material in step 1 must be less than 4%.

[0018] The beneficial effects of the present invention are as follows: (1) The present invention uses a novel three-stage pressing method to greatly improve the stability of high-hollowness Lego blocks, so that the height error of the produced blocks is small. At the same time, under the objective condition that the error of the feed amount in the block volume ratio stage is relatively high (±(2÷4)% of the average mass of the blocks), the pressure in the final pressing stage can be adjusted and other quality parameters of the blocks, such as firmness and frost resistance, can be guaranteed; (2) The use of the present invention to produce high-hollowness bulk raw material Lego bricks can greatly increase the size of the generated blocks - producing products with much higher block height than the prototype, so that the size of the compressed blocks can be close to the shrinkage-free cutting or grouting technology with higher technical costs. At the same time, by reducing the errors in height and block characteristics, the height of the blocks can be increased, thereby reducing Low labor input and the cost of using corresponding equipment to build walls; (3) The use of the molding machine of the present invention can reduce the amount of convergent materials used, and at the same time reduce the requirements for raw materials for Lego brick production, thereby reducing production costs; (4) The hollow Lego blocks produced by the molding machine of the present invention have good quality stability and good product consistency; (5) In addition to the punch that moves up and down relatively in the traditional molding machine, the present invention also adds an additional pressing process in which each block core moves upward individually. These cores have a variable, bottom-to-top shrinking cross-sectional area, and each core is subjected to the same pressure; this additional pressing process can change the hollowness affected by the error of the raw material ratio during each pressing process; if the amount of a single portion of raw material is less than the calibrated amount, the resistance encountered by the core in the initial stage of the activity will be smaller. As the pressing process proceeds, the resistance will become greater and greater, and even in the final stage of the stroke, it will continue to increase until it reaches a level equal to the pressure. The smaller the amount of a single portion of raw material, the greater the stroke. The upward stroke of the core increases the hollowness and reduces the volume of the pressed raw material. The density of the raw material will increase before the end of the pressing stage. If the amount of material in a single portion is greater than the calibration amount, the resistance of the core from the material is equal to the pressure at the beginning. Under this pressure, the stroke of the core will be shortened (always to zero). The larger the amount of material in a single portion, the smaller the stroke. When the stroke of the core upward displacement is larger, the stroke of the core will be shortened.

[0019] In a short time, the hollowness and the volume of the raw material will be close to the original state. Therefore, before the end of the pressing stage, the density of the raw material with a slight increase or no increase will be closer to the situation with a small amount of single raw material and a large core stroke. In this way, as long as the pressure is adjusted correctly, the raw material pressed before the last pressing stage will "automatically" adjust the density, and then level the density before the last pressing stage to ensure that the final density, pressure and quality parameters of LEGO blocks are roughly the same in this stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the hollow Lego brick forming machine of the present invention; Figure 2 , 3It is a sample block diagram of a high hollowness Lego brick made of bulk raw materials using the method and molding machine of this patent; Figure 4 is a diagram of a section of a wall constructed using Lego bricks produced using the patented method and molding machine; Figure 5 It is a plan view of the hollow Lego brick forming machine of the present invention; Figure 6 yes Figure 5 The AA section diagram shows the difference in the amount of filler when the core of each block moves during molding; Figure 7 yes Figure 6 BB cross-section diagram; Figure 8 It shows the positions of the machine components at different stages of the forming of a Lego block. Figure 8-1 This is the filling stage, where the raw material is filled into the die according to the adjustable filling thickness Нз; Figure 8-2 It is a schematic diagram of the groove with the die, the upper punch and the core after they are moved to the initial pressing position. At this time, the filler thickness is the minimum value within the allowable range. Figure 8-3 This is a diagram showing the upper punch displacement stroke L1 at the end of the first pressing stage. Figure 8-4 This is a diagram showing the core tool moving upward to complete the second stage of pressing. The upward displacement of the core tool is set to L2 = "c"; Figure 8-5 It is a schematic diagram of completing the third stage of pressing from below the block at the punch displacement stroke L3; Figure 8-6 It is a schematic diagram of the core tool being separated and returning to the lowest position. It can also be seen in the figure that the upper punch moves upward to the highest position; Figure 8-7 The newly formed block is shown in the position diagram after being pushed out of the die under the action of the downward displacement of the groove. The groove moves downward until it is below the distance hM below the fixed lower punch working surface, and the gripper is clamped; Figure 8-8 This is a diagram showing the core and the groove being lifted together, and the blocks clamped by the slide and the gripper being lifted to the required filling thickness H3, and before the slide slides to the filling position. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] As shown in the figure, a Lego hollow brick forming machine includes a base 1, a hopper 16, a feeding conveyor belt 17, an upper beam 3, a movable beam I5, a movable beam II4, a machine column 2, a main hydraulic cylinder 8, an upper punch 10, a lower punch 11, a groove 9, a hydraulic cylinder IV20, a core 18, a metal sheet 13, and a stacking table 25; the machine column 2 has four mounted on the base 1; the movable beam II4, the movable beam I5, and the upper beam 3 are sequentially mounted on the machine column 2 from bottom to top; the upper beam 3 is a fixed beam ; The master hydraulic cylinder 8 is installed on the upper crossbeam 3; the movable crossbeam Ⅰ5 is connected to the push rod of the master hydraulic cylinder 8, and can move up and down along the machine column 2 under the action of the master hydraulic cylinder 8; the lower end of the movable crossbeam Ⅰ5 is connected to a plurality of upper punches 10; a pair of hydraulic cylinders Ⅰ6 and a pair of hydraulic cylinders Ⅱ7 are also installed on the upper crossbeam 3; the piston rod of the hydraulic cylinder Ⅱ7 is connected to the movable crossbeam Ⅰ5; the movable crossbeam Ⅱ4 is connected to the piston rod of the hydraulic cylinder Ⅰ6, and can move up and down along the machine column under the action of the hydraulic cylinder Ⅰ6 2 moves up and down; the groove 9 is provided with a plurality of parts and is mounted on the movable crossbeam II4; the lower punch 11 is provided with a plurality of parts and is mounted on the base platform 1; the hydraulic cylinder IV20 is provided with a plurality of parts and is mounted on the base platform 1; the core 18 is installed in the groove 9; the core 18 is connected to the hydraulic cylinder IV20 by a connecting rod 19; the core 18 moves up and down in the groove 9 under the action of the hydraulic cylinder IV20; the metal sheet 13 is installed on one side of the movable crossbeam II4; the metal sheet The upper end surface of 13 is flush with the upper end surface of the movable crossbeam II4; a slide 14 is placed on the metal sheet 13; the slide 14 is connected to the hydraulic cylinder III15 and can move along the surface of the metal sheet 13 under the action of the hydraulic cylinder III15; the hydraulic cylinder III15 is fixed on the movable crossbeam II4; the hopper 16 is installed above the metal sheet 13 for containing raw materials; a feeding conveyor belt 17 is provided below the hopper 16 for conveying the raw materials into the slide 14; the stacking table 25 is installed on the movable crossbeam II4.

[0023] The other side of the movable beam Ⅱ4; the front wall of the slide 14 is also mounted with a gripper 24; the upper end surface of the groove 49, the upper end surface of the stacking table 25, the upper end surface of the movable beam Ⅱ4, the upper end surface of the metal sheet 13 are flush.

[0024] The core tool 18 is composed of an upper end 21, a middle part 23, and a lower end 22; the middle part 23 is a part with a gradually changing cross-sectional shape; the upper end 21 and the lower end 22 are parts with fixed cross-sectional shapes; the cross-sectional size of the upper end 21 is smaller than the cross-sectional size of the lower end 22, and the difference between the two is not less than 15%; the middle part 23 is used as a transition connection between the upper end 21 and the lower end 22; the lower punch 11 has a middle opening Ⅰ26; the hole Ⅰ26 is completely matched with the lower end 22; the upper punch 10 has a hole Ⅱ27; the hole Ⅱ27 is completely matched with the upper end 21; the upper punch 10 and the lower punch 11 are completely matched with the groove 9; the height of the middle part 23 does not exceed 0.8 of the height of the Lego brick block; the number of the hydraulic cylinder Ⅳ20, core tool 18, upper punch 10, lower punch 11, and groove 9 is equal; each hydraulic cylinder Ⅳ20 acts independently.

[0025] The operation process and production method of the present invention: At the beginning, the movable crossbeam I and the movable upper punch 10 are located under the action of the hydraulic cylinder II. Figure 8-1 At the highest position shown, the movable crossbeam II is adjusted together with the groove 9 under the action of the piston rod of the hydraulic cylinder I to obtain the filler thickness Hз( Figure 8-1 ) height; at the same time, the core 18 (in the groove 9 Figure 8-1 ) is also adjusted to the same position under the action of the hydraulic cylinder 20 connecting rod 19, so that the core surface coincides with the upper surface of the groove 9 (it should be noted that the filler thickness Hз( Figure 8-1 ) It is necessary to ensure that the average mass of the proportioned raw materials in the closed die "m" matches the corresponding pressure at the pressing completion stage, so as to stabilize the quality parameters of Lego blocks); Slide 14 ( Figure 7 ) is located at the rightmost position under the action of the connecting rod of the hydraulic cylinder III 15 - below the hopper 16 and the feeding conveyor 17, and the feeding conveyor 17 is turned on to fill the required amount of raw materials discharged from the hopper 16 into the slide 14 within the set time. After completion, the slide 14 moves from the rightmost position to the leftmost position under the control of the hydraulic cylinder III 15. During the process, the slide feeds the materials into each die (it should be noted that there will be errors in the feeding amount of each die during the feeding process, some troughs have more materials, and some troughs have less materials). After the feeding is completed, the slide 14 ( Figure 7) moves backward under the action of hydraulic cylinder III 15, taking away the excess raw material above the die in the process, smoothing the raw material, and finally returning to the initial position; then the machine enters the pressing stage, first the active upper punch 10 moves downward under the control of hydraulic cylinder II 7, descends into the die of the die groove 9, reaches a height that is just enough to prevent the bulk raw material from overflowing the die, and then the die groove 9 controlled by hydraulic cylinder I 6, the active upper punch 10 controlled by hydraulic cylinder II 7 and the core 18 controlled by hydraulic cylinder IV 20 move downward together, pushing the die groove 9, the core 18 and the upper punch 10 back to the original position. Figure 8-2 The initial position of the pressing is shown, at which the plane above the core 18 coincides with the upper surface of the groove 9; the filler thickness is the minimum value Нзмин; then the first stage of pressing begins: under the control of the hydraulic cylinder II 7, the active upper punch 10 ( Figure 6 ) descends into the groove 9 to press the raw material, and the stroke is 0.6-0.8 of the total pressing stroke L∑ (such as Figure 8-3 As shown), this stroke is set in the machine adjustment stage; the next is the second stage of pressing, the core 18 moves upward under the action of the hydraulic cylinder IV 20. Since the core 18 is small at the top and large at the bottom, and its middle part 23 is a structure with a cross-section that narrows continuously from bottom to top, the raw materials in the groove 9 are further pressed during the upward movement. Due to the uneven volume ratio of the raw materials and the difference in the feeding amount, the density of the blocks in each groove 9 is different before the second step of pressing, so the distance moved by each core 18 to press the raw materials in each groove 9 is also different: Figure 6 As shown, the distance that the core 18 on the left moves upward is smaller, and the distance that the core 18 on the right moves upward is larger. This is because before the second step of pressing, there is more raw material in the left groove 9, and the block density is large. The force of the core 18 moving upward for pressing is certain. When the second step of pressing is performed, the corresponding core 18 moves a certain distance H U The raw material in the groove 9 can be pressed into a block with a certain density. At this time, the force provided by the hydraulic cylinder IV20 to the core 18 can no longer drive it to move upward to press the block, so the core 18 on the left moves upward by H. U The distance is stopped, so that the second step of pressing of the raw material in the left groove 9 is completed, and a block with a certain density is obtained after the pressing. On the other hand, on the right side, because the raw material in the groove 9 on the right side is small before the second step of pressing, the block density is small, and the force of the core 18 moving upward to press is certain.

[0026] During the second pressing step, the corresponding core 18 moves upward by a distance H. UAfter that, the density of the block in the groove 9 is still relatively small, which is smaller than the density of the block in the left groove 9. At this time, the downward friction resistance of the raw material of the block to the core 18 is smaller than the upward pressure of the core 18, which is not enough to stop the core 18 controlled by the right group of hydraulic cylinders IV20. Therefore, the core 18 on this side continues to move upward, and the volume of the raw material in the groove 9 continues to be compressed. When the core 18 moves upward by a distance of C, the volume of the raw material in the groove 9 is compressed to a certain extent, and a block with the same density as that on the left is obtained. At this time, the core 18 stops moving, and the second step of pressing the raw material of the right groove 9 is completed. In this way, when the second step of pressing is completed, the density of the blocks in each groove is the same; here, the blocks obtained in each groove 9 are the same except for the different internal hollowness, and other things such as density, external dimensions, performance, etc. are the same; Then begins the third stage of pressing - unidirectional pressing from below: (Note: Pressing begins under the action of relative movement in the vertical direction. On one side are the die groove 9 with the block 12, the core 18 and the upper punch 10, and on the other side is the lower punch 11; the relative movement begins with the adjustment of the relative positions of the upper punch 10, the die groove 9 with the block 12 and the fixed lower punch 11. This position is adjusted at the end of the first pressing stage and is the same for all formed blocks; the only difference is the position of the portion 23 of the core 18 that narrows from bottom to top, and its position is adjusted in the second pressing stage) The active upper punch 10 controlled by the main hydraulic cylinder 8 and the hydraulic cylinder II 7, the die groove 9 and the core 18 controlled by the hydraulic cylinder I 6 move relative to each other at the same time to press the raw materials in each die groove 9. When the height of the block in the die groove 9 reaches the set height of the Lego block Н и After that, the pressing is stopped. Thus, the pressing of the third stage is completed, and the newly formed Lego blocks 12 are obtained. The raw material density of these blocks 12 is roughly the same, and the height is also the same. The only difference is the hollowness of the blocks, so the quality parameters of the blocks, such as firmness and antifreeze, are relatively stable. After the pressing is completed, the upper movable punch 10 controlled by the hydraulic cylinder II 7 and the groove 9 controlled by the hydraulic cylinder I 6 move upward together, so that the newly formed Lego blocks 12 ( Figure 6 ) The protruding lower surface must first be separated from the lower surface of the fixed lower punch 11, and then under the action of hydraulic cylinder IV20, the core 18 moves downward to leave the newly formed Lego block 12 and descends to the lowest position (at this position, any core 18 has no contact with any newly formed block 12). Next, under the action of hydraulic cylinder II7, the upper punch 10 moves upward to the highest initial position. During this process, the working surface of the upper punch 10 leaves the protruding upper surface of the newly formed Lego block 12. The hydraulic cylinder I6 ( Figure 6) causes the groove 9 to descend, and during the process, the newly formed block 12 is ejected from the groove 9 by the fixed lower punch 11. When the groove 9 reaches the lowest position, the gripper 24 grabs the upper, larger part of the block 12, which is also the more solid part of the Lego block 12. At this time, the hydraulic cylinder I6 ( Figure 6 ) action drives the movable crossbeam II 4 to move upward, and during the movement, it drives the groove 9 ( Figure 7 ), the carriage 14 where the gripper 24 holding the newly formed Lego block 12 is located and the platform 25 for stacking the blocks before transport and hardening are lifted together to a level that can ensure the basic filler thickness Н з At the same time, under the action of hydraulic cylinder IV 20, all cores 18 are lifted to a height that allows the plane above them to coincide with the plane above the groove 9, and then under the action of hydraulic cylinder III 15, the slide 14 drives the gripper 24 that holds the newly formed Lego block 12 to move to the left. When the newly formed Lego block 12 reaches the stacking table 25, the gripper 24 releases and places the newly formed Lego block 12 on the stacking table 25, and then the slide 14 moves with the gripper 24 from left to right to the initial position at the far right end for the next round of operation. It should be noted here that the die mentioned in the text refers to the die formed between the groove and the core.

[0027] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can also

[0028] Various equivalent modifications or substitutions may be made, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A Lego hollow brick forming machine, characterized in that: It includes a base platform, a hopper, a feeding conveyor belt, an upper crossbeam, a movable crossbeam I, a movable crossbeam II, a machine column, a main hydraulic cylinder, an upper punch, a lower punch, a groove, a hydraulic cylinder IV, a core, a metal sheet, and a stacking table; the machine column is provided with four mounted on the base platform; the movable crossbeam II, the movable crossbeam I, and the upper crossbeam are sequentially mounted on the machine column from bottom to top; the upper crossbeam is a fixed crossbeam; the main hydraulic cylinder is mounted on the upper crossbeam; the movable crossbeam I is connected to the push rod of the main hydraulic cylinder, and can move up and down along the machine column under the action of the main hydraulic cylinder; a number of upper punches are connected to the lower end of the movable crossbeam I; a pair of hydraulic cylinders I and a pair of hydraulic cylinders II are also mounted on the upper crossbeam; the piston rod of the hydraulic cylinder II is connected to the movable crossbeam I; the movable crossbeam II is connected to the piston rod of the hydraulic cylinder I, and can move up and down along the machine column under the action of the hydraulic cylinder I; the groove is provided with a number of grooves, which are mounted on the movable crossbeam II; the lower punch is provided with a number of The stem is installed on the base platform; the hydraulic cylinder IV is provided with several and is installed on the base platform; the core tool is installed in the mold groove; the core tool is connected to the hydraulic cylinder IV by a connecting rod; the core tool moves up and down in the mold groove under the action of the hydraulic cylinder IV; the metal sheet is installed on one side of the movable crossbeam II; the upper end surface of the metal sheet is flush with the upper end surface of the movable crossbeam II; a slide is placed on the metal sheet; the slide is connected to the hydraulic cylinder III and can move along the surface of the metal sheet under the action of the hydraulic cylinder III; the hydraulic cylinder III is installed and fixed on the movable crossbeam II; the hopper is installed above the metal sheet for holding raw materials; a loading conveyor belt is arranged under the hopper for conveying raw materials to the slide; the stacking table is installed on the other side of the movable crossbeam II; a gripper is also installed on the front wall of the slide; the upper end surface of the mold groove, the upper end surface of the stacking table, the upper end surface of the movable crossbeam II, and the upper end surface of the metal sheet are flush.

2. A Lego hollow brick forming machine according to claim 1, characterized in that: The core tool is composed of an upper end, a middle part and a lower end; the middle part is a part with a gradually changing cross-sectional shape; the upper end and the lower end are parts with fixed cross-sectional shapes; the cross-sectional size of the upper end is smaller than that of the lower end; the upper end and the lower end are connected by a transitional middle part; the lower punch has a middle opening I; the hole I is completely matched with the lower end; the upper punch has a hole II; the hole II is completely matched with the upper end; the upper punch and the lower punch are completely matched with the groove; the height of the middle part does not exceed 0.8 of the height of the Lego brick.

3. The Lego hollow brick forming machine according to claim 1, characterized in that: The number of the hydraulic cylinders IV, core tools, upper punches, lower punches and grooves is equal; each hydraulic cylinder IV acts independently.

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