CN115638153A - Hydraulic oil circuit intelligent control working method of brick making hydraulic press - Google Patents
Hydraulic oil circuit intelligent control working method of brick making hydraulic press Download PDFInfo
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- CN115638153A CN115638153A CN202211149450.8A CN202211149450A CN115638153A CN 115638153 A CN115638153 A CN 115638153A CN 202211149450 A CN202211149450 A CN 202211149450A CN 115638153 A CN115638153 A CN 115638153A
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Abstract
The invention discloses an intelligent control working method of a hydraulic oil circuit of a brick making hydraulic machine, which belongs to the field of brick making mechanical equipment, wherein the hydraulic oil circuit comprises a main hydraulic cylinder, a demoulding cylinder, a first hydraulic motor, a second hydraulic motor, a driving hydraulic cylinder, a hydraulic control valve group, a main hydraulic pump and an auxiliary hydraulic pump; the main hydraulic oil cylinder and the demoulding oil cylinder are connected with the main hydraulic pump through a hydraulic control valve group; when the main hydraulic oil cylinder supplies oil and pressurizes through the main hydraulic pump, the auxiliary hydraulic pump can also supply oil and pressurize to the main hydraulic oil cylinder through the hydraulic control valve group. Compared with the prior art, the main hydraulic pump and the auxiliary hydraulic pump can pressurize the main hydraulic cylinder simultaneously when the main hydraulic cylinder is pressurized, so that the load of the main hydraulic pump is reduced, the main hydraulic pump is not easy to damage, and the service life of the main hydraulic pump is prolonged.
Description
Technical Field
The invention relates to the technical field of brick making machines, in particular to an intelligent control working method for a hydraulic oil circuit of a brick making hydraulic machine.
Background
The brick making machine is a machine for producing novel wall material building blocks by using slag, fly ash, stone powder, sand, stones and the like as main raw materials and adding a small amount of cement through hydraulic pressure die casting or vibration. The brick making machine is suitable for producing various hollow building blocks, porous bricks, solid bricks, kerbstones, pavement bricks, grass planting bricks, tree-surrounding bricks, slope protection bricks and other concrete products with different specifications in fixed workplaces.
Most of the existing brick making machines use hydraulic pressure as power, the brick making machines are provided with a main hydraulic cylinder and a demolding cylinder, and are also provided with some hydraulic powers, such as a first hydraulic motor on a vibration table, a second hydraulic motor of a distribution trolley and a driving hydraulic cylinder for driving the distribution trolley to transversely move, when the main hydraulic cylinder presses a brick, the oil pressure of the main hydraulic cylinder needs to reach more than 20MPa, the load of a hydraulic pump for supplying oil to the main hydraulic cylinder is large, the hydraulic pump with a large specification is required to be selected, and the service life of the hydraulic pump is influenced due to the fact that hydraulic pressure is damaged easily due to long-time ultrahigh-load work.
In view of the above, the present inventors have made extensive studies on the above-mentioned drawbacks of the prior art, and have made this invention.
Disclosure of Invention
The invention mainly aims to provide an intelligent control working method for a hydraulic oil circuit of a brick making hydraulic machine, which solves the problem of overlarge load of a hydraulic pump when a main hydraulic oil cylinder presses bricks in the background technology.
In order to achieve the above purpose, the solution of the invention is:
the intelligent control working method of the hydraulic oil circuit of the hydraulic brick making machine comprises a main hydraulic oil cylinder, a demoulding oil cylinder, a first hydraulic motor, a second hydraulic motor, a driving hydraulic cylinder, a hydraulic control valve group, a main hydraulic pump and an auxiliary hydraulic pump, wherein the main hydraulic oil cylinder is arranged on the main hydraulic oil cylinder; the main hydraulic cylinder, the demoulding cylinder, the first hydraulic motor, the second hydraulic motor, the driving hydraulic cylinder, the main hydraulic pump and the auxiliary hydraulic pump are respectively connected with the hydraulic control valve group through hydraulic pipelines;
the main hydraulic cylinder and the demoulding cylinder are connected with the main hydraulic pump through a hydraulic control valve group; the first hydraulic motor, the second hydraulic motor and the driving hydraulic cylinder are connected with the auxiliary hydraulic pump through a hydraulic control valve group; when the main hydraulic oil cylinder supplies oil and pressurizes through the main hydraulic pump, the auxiliary hydraulic pump can also supply oil and pressurize to the main hydraulic oil cylinder through the hydraulic control valve group.
Furthermore, the hydraulic press for making bricks comprises an upper base, an upper moving base, a middle moving base, a guide post and a lower base, wherein the guide post is fixedly arranged between the upper base and the lower base, the main hydraulic cylinder is fixedly arranged on the upper base, the upper moving base is arranged on the guide post in a sliding manner, and the lower end of the main hydraulic cylinder is connected with the upper moving base; the middle moving seat is connected with the guide post in a sliding way and is arranged below the upper moving seat; the upper end and the lower end of the demoulding oil cylinder are respectively connected with the middle moving seat and the lower base; an oil storage barrel is arranged at the upper end of the upper base, and the lower end of the oil storage barrel is communicated with a rodless cavity of the main hydraulic oil cylinder through an electric control valve.
Furthermore, an auxiliary oil cylinder for assisting the upper moving seat and the lower moving seat to rapidly lift is also arranged on the upper base, and the auxiliary oil cylinder is connected with the hydraulic control valve group; when the upper moving seat descends, before a die head on the upper moving seat contacts materials, the auxiliary oil cylinder drives a piston rod of the upper moving seat and a piston rod of the main hydraulic oil cylinder to descend, at the moment, the electric control valve is opened, and hydraulic oil in the oil storage barrel is injected from top to bottom and fills a rodless cavity of the main hydraulic oil cylinder.
Further, an upper die head is arranged on the upper moving seat, a vibrating table is arranged on the lower base, a lower die head is arranged on the vibrating table, downward upper pressing heads corresponding to the die cavities one by one are formed on the upper die head, and upward lower pressing heads corresponding to the die cavities one by one are formed on the lower die head; the upper pressure head can extend into the die cavity from top to bottom, and the lower pressure head can extend into the die cavity from bottom to top; the depth that the upper pressure head can stretch into the die cavity is greater than the depth that the lower pressure head can stretch into the die cavity.
At the beginning, main hydraulic cylinder carries out pressurization downwards, go up the pressure head and stretch into gradually to the die cavity in, the oil pressure increases gradually, and after increasing to 16MPa, the stripper cylinder drives well removal seat and the die frame move one section distance back down and stop, and the pressure head moves to the die cavity from bottom to top down this moment, afterwards main hydraulic cylinder continues to push down to the oil pressure more than 20 MPa.
Further, the hydraulic control valve group is connected with a PLC controller, and the hydraulic control valve group is controlled by the PLC to switch an internal oil way.
Further, the power of the main hydraulic pump is more than twice of the power of the auxiliary hydraulic pump.
Furthermore, an oil pressure detector is installed on the main hydraulic oil cylinder and connected with the PLC to detect the oil pressure in the main hydraulic oil cylinder in real time.
And further, the vibration table starts to distribute materials into the die cavity, and continuously vibrates to finish pressing the materials in the die cavity by the upper pressing head and the lower pressing head.
After the structure is adopted, the hydraulic oil way intelligent control working method of the brick making hydraulic press, which is disclosed by the invention, at least has the following beneficial effects:
1. when the main hydraulic oil cylinder is pressurized downwards, the oil pressure of the auxiliary hydraulic pump can also be pressurized to the main hydraulic oil cylinder through the hydraulic control valve group. The main hydraulic cylinder and the auxiliary hydraulic pump are simultaneously pressurized, so that the load of the main hydraulic cylinder is reduced while the pressure and the power of the main hydraulic cylinder are guaranteed, the two hydraulic pumps are cooperatively used, the main hydraulic pump and the auxiliary hydraulic pump are both in respective load capacity, and the hydraulic pumps are protected.
2. The main hydraulic cylinder is large in pressure required to be generated, the cylinder diameter of the main hydraulic cylinder is large, the oil supply flow of the main hydraulic cylinder and the auxiliary hydraulic pump is limited, in order to enable the main hydraulic cylinder to rapidly descend before the bricks are not pressurized, the main hydraulic cylinder is provided with the auxiliary hydraulic cylinder and the oil storage barrel, the upper moving seat descends at the initial descending stage, the auxiliary hydraulic cylinder drives the upper moving seat to descend, the electric control valve is opened at the moment, hydraulic oil in the oil storage barrel can be rapidly filled in a rodless cavity of the main hydraulic cylinder, then the electric control valve is closed, the main hydraulic cylinder and the auxiliary hydraulic pump are right, the main hydraulic cylinder and the auxiliary hydraulic cylinder are pressurized to drive the upper moving seat to descend, and therefore an upper die head and an upper pressure head on the upper moving seat press materials in a die cavity.
3. The main hydraulic oil cylinder drives the upper moving seat to descend, so that the upper pressure head presses materials in the die cavity, and the materials in the die cavity have the condition that the upper compactness is larger than the lower compactness due to the friction between the materials and the inner wall of the die cavity along with the pressing. Therefore, after the main hydraulic oil cylinder is pressurized to 16MPa, the demolding oil cylinder drives the mold frame to move downwards for a certain distance, so that the direction of the friction force of the materials in the mold cavity is changed to be downwards by the inner wall of the mold cavity, the lower pressing head upwards extends into the mold cavity, the lower part of the materials is pressurized by the lower pressing head upwards, and the upper part and the lower part of a brick are relatively compact.
Compared with the prior art, the main hydraulic pump and the auxiliary hydraulic pump can pressurize the main hydraulic cylinder simultaneously when the main hydraulic cylinder is pressurized, so that the load of the main hydraulic pump is reduced, the main hydraulic pump is not easy to damage, and the service life of the main hydraulic pump is prolonged.
Drawings
FIG. 1 is a schematic structural diagram of a hydraulic oil circuit of a hydraulic press for making bricks.
Fig. 2 is a schematic perspective view of a hydraulic press for making bricks.
FIG. 3 is a front view of hydraulic press for making bricks.
FIG. 4 is an exploded view of a brick molding die.
FIG. 5 is another perspective exploded view of the brickmaking mold.
Fig. 6 is a schematic perspective view of a hydraulic press for making bricks at another angle.
In the figure:
a main hydraulic cylinder 11; a stripper cylinder 12; a first hydraulic motor 13; the second hydraulic motor 14; the driving hydraulic cylinder 15; a hydraulic control valve block 16; the main hydraulic pump 17; an auxiliary hydraulic pump 18; a distributing trolley 19; an upper base 21; the oil reservoir tank 211; an electrically controlled valve 212; an upper moving base 22; an upper die head 221; an upper ram 222; a middle moving seat 23; a mold frame 231; a guide post 24; a lower base 25; a vibrating table 251; a lower die 26; a lower ram 261.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
As shown in fig. 1 to fig. 6, which is an intelligent control working method for hydraulic circuits of a hydraulic brick making machine according to the present invention, the hydraulic circuits include a main hydraulic cylinder 11, a demoulding cylinder 12, a first hydraulic motor 13, a second hydraulic motor 14, a driving hydraulic cylinder 15, a hydraulic control valve set 16, a main hydraulic pump 17, and an auxiliary hydraulic pump 18; the main hydraulic cylinder 11, the demoulding cylinder 12, the first hydraulic motor 13, the second hydraulic motor 14, the driving hydraulic cylinder 15, the main hydraulic pump 17 and the auxiliary hydraulic pump 18 are respectively connected with the hydraulic control valve group 16 through hydraulic pipelines; the main hydraulic cylinder 11 and the demoulding cylinder 12 are connected with the main hydraulic pump 17 through a hydraulic control valve group 16; the first hydraulic motor 13, the second hydraulic motor 14 and the driving hydraulic cylinder 15 are connected with the auxiliary hydraulic pump 18 through a hydraulic control valve group 16; when the main hydraulic cylinder 11 is supplied with oil and pressurized by the main hydraulic pump 17, the auxiliary hydraulic pump 18 may supply oil and pressurized to the main hydraulic cylinder 11 through the hydraulic control valve group 16.
In this way, in the hydraulic circuit intelligent control working method of the brick making hydraulic machine according to the present invention, when the main hydraulic cylinder 11 is pressurized downward, the oil pressure of the auxiliary hydraulic pump 18 can also be pressurized to the main hydraulic cylinder 11 through the hydraulic control valve set 16. Therefore, the main hydraulic pump 17 and the auxiliary hydraulic pump 18 can pressurize the main hydraulic cylinder 11 at the same time, so that the pressure and power of the main hydraulic cylinder 11 are guaranteed, the load of the main hydraulic cylinder 11 is reduced, the two hydraulic pumps cooperate together, the main hydraulic pump 17 and the auxiliary hydraulic pump 18 are both in respective load capacity, and the hydraulic pumps are protected.
Preferably, the hydraulic press for making bricks comprises an upper base 21, an upper moving base 22, a middle moving base 23, a guide post 24 and a lower base 25, wherein the guide post 24 is fixedly arranged between the upper base 21 and the lower base 25, the main hydraulic cylinder 11 is fixedly arranged on the upper base 21, the upper moving base 22 is slidably arranged on the guide post 24, and the lower end of the main hydraulic cylinder 11 is connected with the upper moving base 22; the middle moving seat 23 is connected with the guide post 24 in a sliding way and is arranged below the upper moving seat 22; the upper end and the lower end of the demoulding oil cylinder 12 are respectively connected with the middle moving seat 23 and the lower base 25; the upper end of the upper base 21 is provided with an oil storage barrel 211, and the lower end of the oil storage barrel 211 is communicated with the rodless cavity of the main hydraulic oil cylinder 11 through an electric control valve 212. The upper base 21 is also provided with an auxiliary oil cylinder for assisting the quick lifting of the upper moving seat 22 and the lower moving seat, and the auxiliary oil cylinder is connected with the hydraulic control valve group 16; when the upper moving seat 22 descends, before the die head on the upper moving seat 22 contacts with a material, the auxiliary oil cylinder drives the piston rods of the upper moving seat 22 and the main hydraulic oil cylinder 11 to descend, at this time, the electric control valve 212 is opened, and hydraulic oil in the oil storage barrel 211 is injected from top to bottom and fills the rodless cavity of the main hydraulic oil cylinder 11.
The main hydraulic cylinder 11 has a large cylinder diameter due to the large pressure required to be generated, and the oil supply flow of the main hydraulic pump 17 and the auxiliary hydraulic pump 18 is limited, so that the main hydraulic cylinder 11 can descend more quickly before bricks are not pressurized by the main hydraulic cylinder 11, an auxiliary cylinder and an oil storage barrel 211 are provided, in the initial stage of descending of the upper movable base 22, the auxiliary cylinder drives the upper movable base 22 to descend, at the moment, the electric control valve 212 is opened, so that hydraulic oil in the oil storage barrel 211 can quickly fill a rodless cavity of the main hydraulic cylinder 11, and then the electric control valve 212 is closed, the main hydraulic pump 17 and the auxiliary hydraulic pump 18 pressurize the main hydraulic cylinder 11 and the auxiliary cylinder to drive the upper movable base 22 to descend, so that materials in the cavity of the upper die head 221 and the upper pressure head 222 on the upper movable base 22 are pressed.
Preferably, the upper moving seat 22 is provided with an upper die head 221, the lower base 25 is provided with a vibrating table 251, the vibrating table 251 is provided with a lower die head 26, the upper die head 221 is provided with a downward upper pressing head 222 corresponding to the die cavity one by one, and the lower die head 26 is provided with an upward lower pressing head 261 corresponding to the die cavity one by one; the upper pressing head 222 can extend into the die cavity from top to bottom, and the lower pressing head 261 can extend into the die cavity from bottom to top; the upper ram 222 can extend into the mold cavity to a greater depth than the lower ram 261. At the beginning, the main hydraulic cylinder 11 is pressurized downwards, the upper press head 222 gradually extends into the die cavity, the oil pressure is gradually increased, after the oil pressure is increased to 16MPa, the demolding oil cylinder 12 drives the middle moving seat 23 and the die frame 231 to move downwards for a certain distance and then stop, at this time, the lower press head 261 moves towards the die cavity from bottom to top, and then the main hydraulic cylinder 11 continues to be pressurized till the oil pressure is more than 20 MPa.
The implementation mode of the invention is as follows: firstly, the main hydraulic oil cylinder 11 drives the upper moving seat 22 to descend, so that the upper pressure head 222 presses the materials in the die cavity, and as the pressing is carried out, the materials in the die cavity have the condition that the compactness of the upper part is greater than that of the lower part due to the friction between the materials and the inner wall of the die cavity. The hydraulic forming machine is used for pressing and forming bricks by strong pressure output, and pressure to the bottom of the mold frame 231 is consumed to a certain extent in pressure transmission, so that after the main hydraulic cylinder 11 is pressurized to 16MPa, the demolding oil cylinder 12 drives the mold frame 231 to move downwards for a certain distance, the direction of friction force of materials in the mold cavity on the inner wall of the mold cavity is changed to be downward, the lower pressing head 261 extends upwards into the mold cavity, the lower pressing head 261 is enabled to pressurize the lower parts of the materials upwards, and the upper parts and the lower parts of the bricks are guaranteed to be compact. After that, the main hydraulic cylinder 11 continues to be pressurized to 20MPa until the pressing is completed.
Preferably, the hydraulic control valve set 16 is connected to a PLC controller (not shown in the figure), and the hydraulic control valve set 16 is controlled by the PLC to switch the internal oil paths. The oil way communication mode inside the hydraulic control valve group 16 is controlled by the PLC; preferably, the power of the main hydraulic pump 17 is more than twice the power of the auxiliary hydraulic pump 18. The driving hydraulic cylinder 15 drives the material distribution cart 19 to move laterally so as to distribute the material into the mold frame 231. The first hydraulic motor 13 and the stirring shaft of the distributing trolley 19 are connected with the main hydraulic pump 17 and the auxiliary hydraulic pump 18, so that oil can be independently supplied to the outside, and the main hydraulic pump 17 and the auxiliary hydraulic pump 18 can be used according to the action requirements of equipment, for example, when the auxiliary oil cylinder drives the upper moving seat 22 to ascend, the driving oil cylinder and the first hydraulic motor 13 on the distributing trolley can work under the oil supply of the auxiliary hydraulic pump 18. The two work independently without interference.
Preferably, an oil pressure detector (not shown) is installed on the main hydraulic cylinder 11, and the oil pressure detector is connected with a PLC controller to detect the oil pressure in the main hydraulic cylinder 11 in real time. Through setting up the oil pressure detector for the PLC controller can detect the oil pressure and realize the switching of oil circuit according to program control hydraulic control valves 16.
Preferably, the vibrating table 251 starts from the distribution of the material into the mold cavity, and continuously vibrates the upper pressing head 222 and the lower pressing head 261 to finish the pressing of the material in the mold cavity. The second hydraulic motor 14 is arranged inside the vibration table 251 to drive the vibration table 251 to vibrate.
Compared with the prior art, the main hydraulic pump 17 and the auxiliary hydraulic pump 18 can pressurize the main hydraulic cylinder 11 simultaneously when the main hydraulic cylinder 11 is pressurized, so that the load of the main hydraulic pump 17 is reduced, the main hydraulic pump 17 is not easy to damage, and the service life of the main hydraulic pump 17 is prolonged.
The above embodiments and drawings are not intended to limit the form and style of the product of the present invention, and any suitable changes or modifications thereof by one of ordinary skill in the art should be considered as not departing from the scope of the present invention.
Claims (7)
1. The intelligent control working method of the hydraulic oil circuit of the hydraulic brick making machine is characterized in that the hydraulic oil circuit comprises a main hydraulic oil cylinder, a demoulding oil cylinder, a first hydraulic motor, a second hydraulic motor, a driving hydraulic cylinder, a hydraulic control valve group, a main hydraulic pump and an auxiliary hydraulic pump; the main hydraulic cylinder, the demoulding cylinder, the first hydraulic motor, the second hydraulic motor, the driving hydraulic cylinder, the main hydraulic pump and the auxiliary hydraulic pump are respectively connected with the hydraulic control valve group through hydraulic pipelines;
the main hydraulic oil cylinder and the demoulding oil cylinder are connected with the main hydraulic pump through a hydraulic control valve group; the first hydraulic motor, the second hydraulic motor and the driving hydraulic cylinder are connected with the auxiliary hydraulic pump through a hydraulic control valve group; when the main hydraulic oil cylinder supplies oil and pressurizes through the main hydraulic pump, the auxiliary hydraulic pump can also supply oil and pressurize to the main hydraulic oil cylinder through the hydraulic control valve group.
2. The intelligent hydraulic oil circuit control working method of the brick making hydraulic machine according to claim 1, characterized in that the brick making hydraulic machine comprises an upper base, an upper moving seat, a middle moving seat, a guide post and a lower base, wherein the guide post is fixedly arranged between the upper base and the lower base, the main hydraulic oil cylinder is fixedly arranged on the upper base, the upper moving seat is slidably arranged on the guide post, and the lower end of the main hydraulic oil cylinder is connected with the upper moving seat; the middle moving seat is connected with the guide post in a sliding way and is arranged below the upper moving seat; the upper end and the lower end of the demoulding oil cylinder are respectively connected with the middle moving seat and the lower base; an oil storage barrel is arranged at the upper end of the upper base, and the lower end of the oil storage barrel is communicated with a rodless cavity of the main hydraulic cylinder through an electric control valve.
3. The intelligent control working method for the hydraulic oil circuit of the hydraulic brick making machine according to claim 2, wherein the upper base is further provided with an auxiliary oil cylinder for assisting the quick lifting of the upper moving seat and the lower moving seat, and the auxiliary oil cylinder is connected with the hydraulic control valve group; when the upper moving seat descends, before a die head on the upper moving seat contacts materials, the auxiliary oil cylinder drives a piston rod of the upper moving seat and a piston rod of the main hydraulic oil cylinder to descend, at the moment, the electric control valve is opened, and hydraulic oil in the oil storage barrel is injected from top to bottom and fills a rodless cavity of the main hydraulic oil cylinder.
4. The intelligent hydraulic oil circuit control working method of the hydraulic brick making machine according to claim 2, characterized in that the upper moving seat is provided with an upper die head, the lower base is provided with a vibrating table, the vibrating table is provided with a lower die head, the upper die head is provided with downward upper pressing heads corresponding to the die cavities one by one, and the lower die head is provided with upward lower pressing heads corresponding to the die cavities one by one; the upper pressure head can extend into the die cavity from top to bottom, and the lower pressure head can extend into the die cavity from bottom to top; the depth of the upper pressure head capable of extending into the die cavity is greater than that of the lower pressure head capable of extending into the die cavity;
at the beginning, main hydraulic cylinder carries out pressurization downwards, go up the pressure head and stretch into gradually to the die cavity in, the oil pressure increases gradually, and after increasing to 16MPa, the stripper cylinder drives well removal seat and the die frame move one section distance back down and stop, and the pressure head moves to the die cavity from bottom to top down this moment, afterwards main hydraulic cylinder continues to push down to the oil pressure more than 20 MPa.
5. The intelligent control working method for the hydraulic oil path of the hydraulic brick making machine as claimed in claim 4, wherein the hydraulic control valve set is connected with a PLC controller, and the hydraulic control valve set is controlled by the PLC to switch the internal oil path.
6. The intelligent control working method of the hydraulic oil circuit of the hydraulic brick making machine according to claim 1, characterized in that the power of the main hydraulic pump is more than twice of the power of the auxiliary hydraulic pump.
7. The intelligent control working method of hydraulic oil circuit of hydraulic brick making machine according to claim 5 characterized in that the main hydraulic cylinder is equipped with an oil pressure detector, said oil pressure detector is connected with PLC controller to detect the oil pressure in the main hydraulic cylinder in real time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211149450.8A CN115638153A (en) | 2022-09-21 | 2022-09-21 | Hydraulic oil circuit intelligent control working method of brick making hydraulic press |
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| CN202211149450.8A CN115638153A (en) | 2022-09-21 | 2022-09-21 | Hydraulic oil circuit intelligent control working method of brick making hydraulic press |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118596297A (en) * | 2024-08-09 | 2024-09-06 | 江苏晟通固废环保处置有限公司 | Intelligent control system for press forming of brick making machine |
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2022
- 2022-09-21 CN CN202211149450.8A patent/CN115638153A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118596297A (en) * | 2024-08-09 | 2024-09-06 | 江苏晟通固废环保处置有限公司 | Intelligent control system for press forming of brick making machine |
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