Hot press forming device and method for biochar cotton organic nutrition bowl

Abstract

The invention relates to the technical field of biochar cotton organic nutrition bowl production, in particular to a biochar cotton organic nutrition bowl hot-press forming device and a forming method thereof.The biochar cotton organic nutrition bowl hot-press forming device comprises a fixing frame, a hydraulic push rod and a connecting piece, the upper end of the fixing frame is fixedly connected with the hydraulic push rod, and the moving end of the hydraulic push rod is fixedly connected with the connecting piece; a locking mechanism, a driving mechanism and a cylinder are mounted at the lower end of the connecting piece through a transverse plate, a positioning mechanism is mounted on one side of the driving mechanism, a lower mold control mechanism is rotationally connected to the outer side of the positioning mechanism, and an upper mold is fixedly welded to the bottom end of the cylinder; the positioning mechanism comprises a positioning plate, a rotating shaft is fixedly connected to the upper end of the positioning plate, a positioning disc is fixedly connected to the outer side of the middle of the rotating shaft, and a guide block is fixedly connected to the inner side of one end of the positioning disc; in the process of punching the biochar cotton organic nutrition bowl, continuous processing can be carried out, so that the processing efficiency is improved, streamlined operation is realized, and the production cost of the biochar cotton organic nutrition bowl is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of biochar sponge organic nutrient pot production, and in particular to a hot pressing molding device and a molding method for a biochar sponge organic nutrient pot. Background Art

[0002] Biochar organic nutrient pot is an environmentally friendly bioactive nutrient pot, which is made of plant fiber powder (such as rice husk powder, rice straw powder, etc.), natural organic matter (such as peat soil, sphagnum moss, etc.), bioactive nutrients (such as seaweed) and non-toxic adhesives through hot pressing. The hot stamping molding device heats the raw materials to a certain temperature and puts them into the stamping device, and uses the pressure of the stamping machine to press the molten raw materials into a product of a specific shape. In the production process of the biochar sponge organic nutrient pot, the raw materials mixed with plant fiber powder, natural organic matter, bioactive nutrients and non-toxic adhesives are heated to a suitable temperature, and then external force is applied through the stamping device to form them in the mold, thereby quickly and efficiently producing biochar sponge organic nutrient pots with a certain shape and structure; In the process of hot pressing and forming biochar sponge organic nutrient pots, if the biochar sponge organic nutrient pots are stamped individually or the stamping process is discontinuous, it will affect the smoothness of the production of the biochar sponge organic nutrient pots, and then affect the processing efficiency. Therefore, in order to solve the above problems, a hot pressing and forming device and a forming method of biochar sponge organic nutrient pots are proposed. Summary of the invention

[0003] The purpose of the present invention is to provide a hot pressing forming device and a forming method for biochar sponge organic nutrient pots, so as to solve the problem that during the hot pressing forming process of the biochar sponge organic nutrient pots, the biochar sponge organic nutrient pots are stamped separately, or the stamping process is discontinuous, which will affect the smoothness of the production of the biochar sponge organic nutrient pots and thus affect the processing efficiency.

[0004] To achieve the above object, the present invention provides the following technical solutions: A hot pressing forming device for a biochar sponge organic nutrient pot and a forming method thereof, comprising a fixed frame, a hydraulic push rod and a connecting piece, wherein the upper end of the fixed frame is fixedly connected to the hydraulic push rod, the movable end of the hydraulic push rod is fixedly connected to the connecting piece, the lower end of the connecting piece is installed with a locking mechanism, a driving mechanism and a cylinder through a transverse plate, a positioning mechanism is installed on one side of the driving mechanism, the outer side of the positioning mechanism is rotatably connected to a lower mold control mechanism, and the bottom end of the cylinder is welded and fixed with an upper mold; the positioning mechanism comprises a positioning plate, the upper end of the positioning plate is fixedly connected to a rotating shaft, the middle outer side of the rotating shaft is fixedly connected to a positioning disk, and the positioning disk A guide block is fixedly connected to the inner side of one end; the locking mechanism includes a bent plate, a cylinder is fixedly connected to the inner side of one end of the bent plate, the upper end of the piston inside the cylinder is fixedly connected to the piston push rod inside the cylinder, an air cavity is opened on the inner side of the other end of the bent plate, the air cavity is connected with the inside of the cylinder through a connecting hole, and a moving block is slidably connected to the inner side of the upper end of the air cavity through a spring; the driving mechanism includes a vertical plate, a rotating plate is rotatably connected to the inner side of the vertical plate through a connecting shaft, and a bottom support plate is installed at the lower end of the rotating plate; the lower mold control mechanism includes a gear ring, a round shaft is rotatably connected to the inner side of the gear ring, and the lower mold is fixedly connected to one side of the round shaft.

[0005] As a further optimization of the present invention, there are two positioning plates, the positioning plates are parallel to each other, the cross section of the positioning plate is H-shaped, and the positioning plate and the rotating shaft have the same axis.

[0006] As a further optimization content of the present invention, the bent plate is L-shaped, the air cavity is L-shaped, the cylinder is installed inside the bent plate, the piston push rod inside the cylinder is slidably connected to the bent plate, the upper end of the piston push rod inside the cylinder is exposed at the outside of the bent plate and is welded and fixed to the cross plate, and the angle between the piston push rod inside the cylinder and the cross plate is 90°.

[0007] As a further optimization of the present invention, the top of the bent plate is a concave arc, the end of the moving block away from the spring is a concave arc, one end of the spring is fixedly connected to the moving block, and the other end of the spring is fixedly connected to the inner wall of the air cavity.

[0008] As a further optimization of the present invention, the vertical projection of the vertical plate is U-shaped, the rotating plate, the connecting shaft and the bottom support plate are all installed inside the vertical plate, and the bottom support plate is welded and fixed to the inner wall of the vertical plate.

[0009] As a further optimization of the present invention, there are two gear rings arranged inside the lower mold control mechanism, the gear rings are parallel to each other, the gear rings are rotatably connected to the positioning plate, four lower molds are arranged between the gear rings, and round shafts are welded and fixed on both sides of any lower mold.

[0010] As a further optimization of the present invention, there are two driving mechanisms, the two driving mechanisms are parallel to each other, the driving mechanisms correspond to the gear rings one by one, the upper end of the vertical plate is fixedly connected to the horizontal plate, and the angle between the vertical plate and the horizontal plate is 90°.

[0011] As a further optimization of the present invention, there are multiple rotating plates, connecting shafts and bottom support plates, and there is a one-to-one correspondence between the rotating plates, connecting shafts and bottom support plates.

[0012] As a further optimization of the present invention, the bottom of the positioning plate and the bent plate are fixedly connected to the bottom end of the fixing frame by bolts, and the fixing frame is in a "mouth" shape.

[0013] As a further optimized content of the present invention, the following steps are included: Step I: driving one of the lower molds to move between the guide block and the bent plate: driving one of the lower molds installed inside the gear ring to rotate the gear ring through the driving mechanism and move it to a position between the guide block and the bent plate; Step II: Add heated raw materials to the lower mold: Pour the heated raw materials into the lower mold to prepare for stamping; Step III: Control the upper die to move downward and perform stamping: The hydraulic push rod drives the horizontal plate to move downward. During the downward movement of the horizontal plate, the upper die is driven to move toward the inside of the lower die between the guide block and the bending plate, and cooperates with the lower die to complete stamping; During the downward movement of the upper mold, the piston push rod inside the cylinder pushes the air in the cylinder into the air cavity, and the air pressure inside the air cavity increases, thereby pushing the moving block out of the bent plate. After being pushed out, the moving block is tightly attached to the lower mold between the guide block and the bent plate, thereby limiting the movement of the lower mold and the rotation of the gear ring. In addition, the gear ring will rotate during the downward movement of the rotating plate, and cannot drive the gear ring to rotate. Step IV: Control the upper die to move upward and drive the next lower die to move between the guide block and the bent plate: After the stamping is completed, the horizontal plate is reset under the drive of the hydraulic push rod. During the upward movement of the horizontal plate, the piston push rod inside the cylinder moves upward, and the moving block is reset under the tension of the spring. The rotating plate cannot rotate under the support of the bottom support plate, thereby driving the gear ring to rotate. When the vertical plate moves to the uppermost end, the next die moves between the guide block and the bent plate, and the next stamping process is repeated.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, by providing a driving mechanism, a positioning mechanism, a locking mechanism and a lower mold control mechanism, the biochar sponge organic nutrient pot can be processed continuously during the stamping process, thereby improving the processing efficiency, streamlining the operation, and effectively reducing the production cost of the biochar sponge organic nutrient pot; 2. In the present invention, by setting a locking mechanism and utilizing the up and down movement of the horizontal plate, the moving block and the guide block cooperate with each other, and the lower mold can be automatically clamped and positioned at the required position, further improving the stability of the upper mold and the lower mold during the stamping process; 3. In the present invention, through the provided driving mechanism, when the horizontal plate moves downward, it contacts with the gear ring and does not drive the gear ring to rotate. When the horizontal plate moves upward, it drives the gear ring to rotate, thereby realizing unidirectional rotation of the gear ring. At the same time, the rotation angle of the gear ring can be controlled according to the displacement distance of the horizontal plate to realize continuous processing. At the same time, through the provided circular shaft, the stamped biochar sponge organic nutrient pot can be automatically poured out when the lower mold moves to the lowest end. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the structure at A in the middle; Figure 3 It is a schematic diagram of the positioning mechanism structure of the present invention; Figure 4 It is a schematic diagram of the locking mechanism structure of the present invention; Figure 5 It is a schematic diagram of the structure of the driving mechanism of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the structure at B in the middle; Figure 7 It is a schematic diagram of the structure of the lower mold control mechanism of the present invention.

[0016] In the figure: 1. Fixed frame; 2. Hydraulic push rod; 3. Connecting piece; 4. Positioning mechanism; 41. Positioning plate; 42. Rotating shaft; 43. Guide block; 44. Positioning plate; 5. Locking mechanism; 51. Bending plate; 52. Moving block; 53. Spring; 54. Air cavity; 55. Connecting hole; 56. Cylinder; 57. Piston push rod inside the cylinder; 6. driving mechanism; 61. vertical plate; 62. rotating plate; 63. connecting shaft; 64. bottom supporting plate; 7. Lower mold control mechanism; 71. gear ring; 72. lower mold; 73. round shaft; 8. Horizontal plate; 9. Cylinder; 10. Upper mold. DETAILED DESCRIPTION

[0017] See also Figure 1-7 , the present invention provides a technical solution: A hot pressing forming device and forming method of a biochar sponge organic nutrient pot, comprising a fixed frame 1, a hydraulic push rod 2 and a connecting piece 3, wherein the upper end of the fixed frame 1 is fixedly connected to the hydraulic push rod 2, the movable end of the hydraulic push rod 2 is fixedly connected to the connecting piece 3, the lower end of the connecting piece 3 is installed with a locking mechanism 5, a driving mechanism 6 and a cylinder 9 through a transverse plate 8, a positioning mechanism 4 is installed on one side of the driving mechanism 6, the outer side of the positioning mechanism 4 is rotatably connected to a lower mold control mechanism 7, and the bottom end of the cylinder 9 is welded and fixed with an upper mold 10; the positioning mechanism 4 comprises a positioning plate 41, the upper end of the positioning plate 41 is fixedly connected to a rotating shaft 42, a positioning plate 44 is fixedly connected to the outer side of the middle of the rotating shaft 42, and one end of the positioning plate 44 is fixedly connected to the inner side. Guide block 43; the locking mechanism 5 includes a bent plate 51, one end of the bent plate 51 is fixedly connected to the inner side of a cylinder 56, the upper end of the internal piston of the cylinder 56 is fixedly connected to the internal piston push rod 57 of the cylinder, the other end of the bent plate 51 is provided with an air cavity 54, the air cavity 54 is connected to the inside of the cylinder 56 through a connecting hole 55, and the inner side of the upper end of the air cavity 54 is slidably connected to a moving block 52 through a spring 53; the driving mechanism 6 includes a vertical plate 61, the inner side of the vertical plate 61 is rotatably connected to a rotating plate 62 through a connecting shaft 63, and a bottom support plate 64 is installed at the lower end of the rotating plate 62; the lower mold control mechanism 7 includes a gear ring 71, the inner side of the gear ring 71 is rotatably connected to a round shaft 73, and one side of the round shaft 73 is fixedly connected to the lower mold 72.

[0018] As a technical solution for further implementation of this scheme, two positioning plates 41 are provided, the positioning plates 41 are parallel to each other, the cross section of the positioning plate 44 is H-shaped, and the positioning plate 44 and the rotating shaft 42 have the same axis. Through the above arrangement, the driving mechanism 6 can be stably limited; As a technical solution for further implementation of this solution, the bent plate 51 is L-shaped, the air cavity 54 is L-shaped, the cylinder 56 is installed inside the bent plate 51, the piston push rod 57 inside the cylinder is slidably connected to the bent plate 51, the upper end of the piston push rod 57 inside the cylinder is exposed outside the bent plate 51 and is welded and fixed to the cross plate 8, and the angle formed between the piston push rod 57 inside the cylinder and the cross plate 8 is 90°. Through the above arrangement, the lower mold 72 can be stably limited during the stamping process; As a further technical solution of this solution, the top of the bent plate 51 is in a concave arc shape, the end of the moving block 52 away from the spring 53 is in a concave arc shape, one end of the spring 53 is fixedly connected to the moving block 52, and the other end of the spring 53 is fixedly connected to the inner wall of the air cavity 54. Through the above arrangement, the stability of the lower mold 72 during the fixing process can be further improved; As a further technical solution for implementing the present invention, the vertical projection of the vertical plate 61 is U-shaped, the rotating plate 62, the connecting shaft 63 and the bottom support plate 64 are all installed inside the vertical plate 61, and the bottom support plate 64 is welded and fixed to the inner wall of the vertical plate 61. Through the above arrangement, the vertical plate 61 can drive the gear ring 71 to rotate only when the vertical plate 61 moves upward; As a technical solution for further implementation of this solution, there are two gear rings 71 arranged inside the lower mold control mechanism 7, the gear rings 71 are parallel to each other, the gear rings 71 are rotatably connected to the positioning plate 44, and there are four lower molds 72 arranged between the gear rings 71. Round shafts 73 are welded and fixed on both sides of any lower mold 72, which can stabilize the lower mold 72 and drive the lower mold 72 to rotate; As a technical solution for further implementation of this scheme, two drive mechanisms 6 are provided, the two drive mechanisms 6 are parallel to each other, the drive mechanisms 6 correspond to the gear ring 71 one by one, the upper end of the vertical plate 61 is fixedly connected to the horizontal plate 8, and the angle formed between the vertical plate 61 and the horizontal plate 8 is 90°. Through the above arrangement, the stability of the device during operation can be effectively improved; As a technical solution for further implementation of the present scheme, multiple rotating plates 62, connecting shafts 63 and bottom support plates 64 are provided, and there is a one-to-one correspondence between the rotating plates 62, connecting shafts 63 and bottom support plates 64. The bottoms of the positioning plates 41 and the bent plates 51 are fixedly connected to the bottom end of the fixing frame 1 by bolts. The fixing frame 1 is in a "mouth" shape. Through the above arrangement, the stability of the overall structure of the equipment can be improved.

[0019] As a technical solution for further implementation of this scheme, the following steps are included: Step I: driving one of the lower molds 72 to move between the guide block 43 and the bent plate 51: driving one of the lower molds 72 installed inside the gear ring 71 to rotate the gear ring 71 through the driving mechanism 6 and move it to a position between the guide block 43 and the bent plate 51; Step II: Adding heated raw materials to the lower mold 72: Pour the heated raw materials into the lower mold 72 to prepare for stamping; Step III: Control the upper die 10 to move downward for stamping: The hydraulic push rod 2 drives the horizontal plate 8 to move downward. During the downward movement of the horizontal plate 8, the upper die 10 is driven to move toward the inside of the lower die 72 between the guide block 43 and the bent plate 51, and cooperates with the lower die 72 to complete stamping; During the downward movement of the upper mold 10, the piston push rod 57 inside the cylinder pushes the air in the cylinder 56 into the air cavity 54, and the air pressure inside the air cavity 54 increases, thereby pushing the moving block 52 out of the bent plate 51. After being pushed out, the moving block 52 is tightly attached to the lower mold 72 between the guide block 43 and the bent plate 51, thereby limiting the movement of the lower mold 72 and limiting the rotation of the gear ring 71. In addition, the gear ring 71 will rotate during the downward movement of the rotating plate 62, and cannot drive the gear ring 71 to rotate. Step IV: Control the upper mold 10 to move upward, and drive the next lower mold 72 to move between the guide block 43 and the bent plate 51: After the stamping is completed, the cross plate 8 is reset under the drive of the hydraulic push rod 2. During the upward movement of the cross plate 8, the piston push rod 57 inside the cylinder moves upward, and the moving block 52 is reset under the tension of the spring 53. The rotating plate 62 cannot rotate under the support of the bottom support plate 64, thereby driving the gear ring 71 to rotate. When the vertical plate 61 moves to the uppermost end, the next mold 72 moves to between the guide block 43 and the bent plate 51, and repeats the next stamping process.

[0020] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A hot pressing molding device for biochar sponge organic nutrient pots, comprising a fixing frame (1), a hydraulic push rod (2) and a connecting piece (3), characterized in that: The upper end of the fixed frame (1) is fixedly connected to a hydraulic push rod (2), the movable end of the hydraulic push rod (2) is fixedly connected to a connecting piece (3), the lower end of the connecting piece (3) is installed with a locking mechanism (5), a driving mechanism (6) and a cylinder (9) through a transverse plate (8), a positioning mechanism (4) is installed on one side of the driving mechanism (6), the outer side of the positioning mechanism (4) is rotatably connected to a lower mold control mechanism (7), and the lower end of the cylinder (9) is welded and fixed with an upper mold (10); The positioning mechanism (4) comprises a positioning plate (41), the upper end of the positioning plate (41) is fixedly connected to a rotating shaft (42), the middle outer side of the rotating shaft (42) is fixedly connected to a positioning plate (44), and the inner side of one end of the positioning plate (44) is fixedly connected to a guide block (43); The locking mechanism (5) comprises a bent plate (51), the inner side of one end of the bent plate (51) is fixedly connected to a cylinder (56), the upper end of the piston inside the cylinder (56) is fixedly connected to a piston push rod (57) inside the cylinder, the inner side of the other end of the bent plate (51) is provided with an air cavity (54), the air cavity (54) is connected to the inside of the cylinder (56) through a connecting hole (55), and the inner side of the upper end of the air cavity (54) is slidably connected to a moving block (52) through a spring (53); The driving mechanism (6) comprises a vertical plate (61), the inner side of the vertical plate (61) is rotatably connected to a rotating plate (62) via a connecting shaft (63), and a bottom support plate (64) is mounted at the lower end of the rotating plate (62); The lower mold control mechanism (7) comprises a gear ring (71), the inner side of the gear ring (71) is rotatably connected to a circular shaft (73), and one side of the circular shaft (73) is fixedly connected to the lower mold (72).

2. The hot pressing molding device of the biochar sponge organic nutrient pot according to claim 1 is characterized in that: Two positioning plates (41) are provided, and the positioning plates (41) are parallel to each other. The cross section of the positioning plate (44) is H-shaped, and the positioning plate (44) and the rotating shaft (42) share the same axis.

3. The hot pressing molding device of the biochar sponge organic nutrient pot according to claim 1 is characterized in that: The bent plate (51) is L-shaped, the air cavity (54) is L-shaped, the cylinder (56) is installed inside the bent plate (51), the piston push rod (57) inside the cylinder is slidably connected to the bent plate (51), the upper end of the piston push rod (57) inside the cylinder is exposed outside the bent plate (51) and is welded and fixed to the cross plate (8), and the angle formed between the piston push rod (57) inside the cylinder and the cross plate (8) is 90°.

4. The hot pressing molding device of the biochar sponge organic nutrient pot according to claim 1, characterized in that: The top end of the bent plate (51) is in a concave arc shape, the end of the moving block (52) away from the spring (53) is in a concave arc shape, one end of the spring (53) is fixedly connected to the moving block (52), and the other end of the spring (53) is fixedly connected to the inner wall of the air cavity (54).

5. The hot pressing molding device for biochar sponge organic nutrient pot according to claim 1, characterized in that: The vertical projection of the vertical plate (61) is U-shaped, the rotating plate (62), the connecting shaft (63) and the bottom support plate (64) are all installed inside the vertical plate (61), and the bottom support plate (64) is welded and fixed to the inner wall of the vertical plate (61).

6. The hot pressing molding device for biochar sponge organic nutrient pot according to claim 1, characterized in that: Two gear rings (71) are arranged inside the lower mold control mechanism (7). The gear rings (71) are parallel to each other. The gear rings (71) are rotatably connected to the positioning plate (44). Four lower molds (72) are arranged between the gear rings (71). Round shafts (73) are welded and fixed on both sides of any lower mold (72).

7. The hot pressing molding device for biochar sponge organic nutrient pots according to claim 1, characterized in that: Two driving mechanisms (6) are provided, the two driving mechanisms (6) are parallel to each other, the driving mechanisms (6) correspond to the gear rings (71) one to one, the upper ends of the vertical plates (61) are fixedly connected to the horizontal plates (8), and the angle formed between the vertical plates (61) and the horizontal plates (8) is 90°.

8. The hot pressing molding device for biochar sponge organic nutrient pots according to claim 1, characterized in that: The rotating plates (62), the connecting shafts (63) and the bottom supporting plates (64) are each provided in plurality, and the rotating plates (62), the connecting shafts (63) and the bottom supporting plates (64) correspond one to one.

9. The hot pressing molding device for biochar sponge organic nutrient pot according to claim 1, characterized in that: The bottoms of the positioning plate (41) and the bent plate (51) are fixedly connected to the bottom end of the fixing frame (1) via bolts, and the fixing frame (1) is in a "mouth" shape.

10. A molding method of a hot pressing molding device for a biochar sponge organic nutrient pot according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step I: driving one of the lower dies (72) to move between the guide block (43) and the bent plate (51): driving one of the lower dies (72) installed inside the gear ring (71) to rotate the gear ring (71) through the driving mechanism (6) and move the lower dies (72) to a position between the guide block (43) and the bent plate (51); Step II: Adding heated raw materials to the lower mold (72): Pour the heated raw materials into the lower mold (72) to prepare for stamping; Step III: Control the upper die (10) to move downward for stamping: The hydraulic push rod (2) drives the horizontal plate (8) to move downward. During the downward movement of the horizontal plate (8), the upper die (10) is driven to move toward the interior of the lower die (72) between the guide block (43) and the bending plate (51), and cooperates with the lower die (72) to complete stamping; During the downward movement of the upper mold (10), the piston push rod (57) inside the cylinder pushes the air in the cylinder (56) into the air cavity (54), and the air pressure inside the air cavity (54) increases, thereby pushing the moving block (52) out of the bent plate (51). After being pushed out, the moving block (52) is tightly attached to the lower mold (72) between the guide block (43) and the bent plate (51), thereby limiting the movement of the lower mold (72) and limiting the rotation of the gear ring (71). In addition, the gear ring (71) will rotate during the downward movement of the rotating plate (62), and cannot drive the gear ring (71) to rotate. Step IV: Control the upper die (10) to move upward, and drive the next lower die (72) to move between the guide block (43) and the bent plate (51): After the stamping is completed, the horizontal plate (8) is reset under the drive of the hydraulic push rod (2). During the upward movement of the horizontal plate (8), the piston push rod (57) inside the cylinder moves upward, and the moving block (52) is reset under the tension of the spring (53). The rotating plate (62) cannot rotate under the support of the bottom support plate (64), thereby driving the gear ring (71) to rotate. When the vertical plate (61) moves to the uppermost end, the next die (72) moves between the guide block (43) and the bent plate (51), and the next stamping process is repeated.

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