Rubber and preparation method thereof

Abstract

The invention relates to rubber preparation, in particular to rubber and a preparation method thereof.The method comprises the following steps that firstly, whether a hook body mold II arranged on an outer mold and a hook body mold I on an inner mold are located on the same side or not is adjusted according to the type of a processed rubber plate; 2, according to the length requirement of the processed rubber plate, the distance between the inner mold and the outer mold in the forming groove is adjusted; 3, injecting a molten rubber raw material between the inner mold and the outer mold through the injection hole to form a first rubber plate or a second rubber plate; the rubber comprises a first rubber plate and a second rubber plate, connecting hook bodies I are arranged at the two ends of the first rubber plate, the two connecting hook bodies I are located on the two sides of the first rubber plate respectively, connecting hook bodies II are arranged at the two ends of the second rubber plate, and the two connecting hook bodies II are located on the same side of the first rubber plate. The rubber plates which can be mutually spliced can be prepared.

Description

Technical Field

[0001] The present invention relates to rubber preparation, and more particularly to a rubber and a preparation method thereof. Background Art

[0002] Rubber preparation is the process of converting natural rubber or synthetic rubber into a usable product; for example, CN216400294U discloses a conductive silicone rubber preparation device, which can reduce the probability of dangerous accidents caused by putting hands into the reeling port of the silicone rubber preparation machine due to operational errors to a certain extent, and a motor and a roller are arranged inside the feed shell. When the raw material is inserted into the feed port and extended forward to a certain length, the roller driven by the motor will automatically roll the raw material into the feed port of the silicone rubber preparation machine, and the user's hand cannot touch the roller; however, the disadvantage of this patent is that it is impossible to prepare a rubber sheet that can be spliced ​​to each other, and the rubber sheet can be spliced ​​into different lengths according to different usage requirements. Summary of the invention

[0003] The object of the present invention is to provide a rubber and a preparation method thereof, which can be used to prepare a rubber plate that can be spliced ​​with each other, and the rubber plate can be spliced ​​into different lengths according to different use requirements.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A rubber preparation device comprises a molding ring, a plurality of molding grooves are arranged on the molding ring, a plurality of injection holes are arranged at the bottom of the molding ring, the plurality of injection holes are respectively connected to the plurality of molding grooves, and an inner mold and an outer mold are slidably connected in the molding grooves;

[0006] The molding ring is fixedly connected to the mounting bracket, a mounting plate is fixedly connected inside the molding ring, a plurality of telescopic mechanisms I are fixedly connected to the mounting plate, an inner mold is fixedly connected to the telescopic end of the telescopic mechanism I, and a hook body mold I is arranged on the inner mold;

[0007] The mounting bracket is fixedly connected with a plurality of flip motors, and the output shaft of each flip motor is fixedly connected with a sliding track, the sliding track is rotatably connected with a screw rod, the sliding track is slidably connected with an outer mold, the outer mold is connected to the screw rod through a thread, and the front and rear ends of the outer mold are fixedly connected with a hook mold II, and the two hook molds II are oriented on the same side of the outer mold;

[0008] The sliding track is fixedly connected with a power mechanism I for driving the screw rod to rotate;

[0009] The bottom of the forming ring is fixedly connected with a plurality of connecting pipes connected with a plurality of injection holes, each connecting pipe is fixedly connected with a discharge pipe, each discharge pipe is fixedly connected with an injection cavity, each injection cavity is fixedly connected with a discharge pipe, a rotating ball is rotatably connected in the injection cavity, a receiving groove is provided on the rotating ball, two telescopic mechanisms II are fixedly connected in the receiving groove, and a push plate is fixedly connected to the telescopic end of each telescopic mechanism II;

[0010] The injection cavity is fixedly connected with a power mechanism II for driving the rotating ball to rotate;

[0011] The rotating sphere is fixedly connected to a rotating seat, and two telescopic mechanisms III are fixedly connected to the rotating seat. Sensors are fixedly connected to the telescopic ends of the two telescopic mechanisms III, and the two sensors are respectively connected to the two telescopic mechanisms II;

[0012] The outer mold is slidably connected with a sliding column, and the front and rear ends of the sliding column are fixedly connected with a ship-shaped plate, and a compression spring is fixedly connected between the ship-shaped plate and the outer mold, and the ship-shaped plate can contact the sensor located at the lower side;

[0013] A method for preparing rubber, the method comprising the following steps:

[0014] Step 1: According to the type of rubber sheet to be processed, adjust whether the hook mold II set on the outer mold is on the same side as the hook mold I on the inner mold;

[0015] Step 2: Adjust the distance between the inner mold and the outer mold in the molding groove according to the length requirement of the processed rubber sheet;

[0016] Step 3: injecting the molten rubber raw material into between the inner mold and the outer mold through the injection hole to form the first rubber sheet or the second rubber sheet;

[0017] A rubber, which is a first rubber plate and a second rubber plate, wherein both ends of the first rubber plate are provided with connecting hook bodies I, and the two connecting hook bodies I are respectively located on both sides of the first rubber plate, and both ends of the second rubber plate are provided with connecting hook bodies II, and the two connecting hook bodies II are both located on the same side of the first rubber plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0019] Figure 1 It is a schematic diagram of the structure of the first rubber sheet and the second rubber sheet of the present invention being spliced ​​together;

[0020] Figure 2 is a side view of the first rubber sheet and the second rubber sheet of the present invention being spliced ​​together;

[0021] Figure 3 It is a schematic diagram of the structure of the first rubber sheet of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of a second rubber sheet of the present invention;

[0023] Figure 5 It is a schematic structural diagram of the rubber preparation device of the present invention;

[0024] Figure 6 is a cross-sectional view of a rubber preparation device of the present invention;

[0025] Figure 7 It is a schematic diagram of the mounting bracket structure of the present invention;

[0026] Figure 8 It is a schematic diagram of the structure of the forming ring of the present invention;

[0027] Fig. 9 It is a schematic diagram of the inner mold structure of the present invention;

[0028] Fig.10 is a top view of the inner mold of the present invention;

[0029] Fig.11 It is a schematic diagram of the outer mold structure of the present invention;

[0030] Fig.12 is a top view of the outer mold of the present invention;

[0031] Fig.13 It is a schematic diagram of the injection cavity structure of the present invention;

[0032] Fig.14 It is a cross-sectional view of the injection cavity of the present invention.

[0033] In the figure: a first rubber sheet 1; a connecting hook body Ⅰ11; a second rubber sheet 2; a connecting hook body Ⅱ21; a mounting bracket 31; a molding ring 32; a molding groove 33; an injection hole 34; a mounting plate 41; a telescopic mechanism Ⅰ42; an inner mold 43; a hook body mold Ⅰ44; a connecting pipe 45; a flip motor 51; a sliding track 52; a screw rod 53; an outer mold 54; a hook body mold Ⅱ55; a sliding column 56; a ship-shaped plate 57; an injection cavity 61; a discharge pipe 62; a discharge pipe 63; a rotating ball 64; a receiving groove 65; a telescopic mechanism Ⅱ66; a push plate 67; a telescopic mechanism Ⅲ68; a sensor 69; and a rotating seat 610. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below with reference to the accompanying drawings.

[0035] like Figures 1 to 14As shown, in order to facilitate the implementation of a rubber preparation method, a rubber preparation device is designed, and the structure and function of the rubber preparation device are described in detail below;

[0036] A rubber preparation device includes a molding ring 32, wherein the molding ring 32 is provided with a plurality of molding grooves 33, and a plurality of injection holes 34 are provided at the bottom of the molding ring 32, wherein the plurality of injection holes 34 are respectively connected to the plurality of molding grooves 33, and an inner mold 43 and an outer mold 54 are slidably connected in the molding grooves 33;

[0037] The molding ring 32 is fixedly connected to the mounting bracket 31, a mounting plate 41 is fixedly connected inside the molding ring 32, a plurality of telescopic mechanisms Ⅰ42 are fixedly connected to the mounting plate 41, an inner mold 43 is fixedly connected to the telescopic end of the telescopic mechanism Ⅰ42, and a hook body mold Ⅰ44 is arranged on the inner mold 43;

[0038] The mounting bracket 31 is fixedly connected with a plurality of flip motors 51, and the output shaft of each flip motor 51 is fixedly connected with a sliding track 52, and the sliding track 52 is rotatably connected with a screw rod 53, and the sliding track 52 is slidably connected with an outer mold 54, and the outer mold 54 is connected to the screw rod 53 by threads, and the front and rear ends of the outer mold 54 are fixedly connected with hook molds II 55, and the two hook molds II 55 are oriented on the same side of the outer mold 54;

[0039] The sliding track 52 is fixedly connected with a power mechanism I for driving the screw rod 53 to rotate;

[0040] The bottom of the molding ring 32 is fixedly connected with a plurality of connecting pipes 45 communicating with a plurality of injection holes 34, each connecting pipe 45 is fixedly connected with a discharge pipe 63, each discharge pipe 63 is fixedly connected with an injection cavity 61, each injection cavity 61 is fixedly connected with a discharge pipe 62, a rotating ball 64 is rotatably connected in the injection cavity 61, a receiving groove 65 is provided on the rotating ball 64, two telescopic mechanisms II 66 are fixedly connected in the receiving groove 65, and a push plate 67 is fixedly connected to the telescopic end of each telescopic mechanism II 66;

[0041] The injection cavity 61 is fixedly connected with a power mechanism II for driving the rotating ball 64 to rotate;

[0042] When using, Figure 5 As shown, according to the type of rubber sheet to be processed, the flip motor 51 is started, the output shaft of the flip motor 51 starts to rotate, the output shaft of the flip motor 51 drives the sliding track 52 to rotate, the sliding track 52 drives the outer mold 54 to move, and the outer mold 54 drives the two hook molds II 55 thereon to move, as shown in FIG. Fig.12As shown, the two hook molds II 55 are located on the same side of the outer mold 54, and then during the rotation of the outer mold 54, the positions of the two hook molds II 55 are adjusted so that the designated hook mold II 55 moves to the side of the molding groove 33, and cooperates with the hook mold I 44 on the inner mold 43, so that the hook mold II 55 and the hook mold I 44 are located on the same side or the hook mold II 55 and the hook mold I 44 are located on the opposite side, and the hook mold II 55 and the hook mold I 44 are located on the same side to form the following processing. Figure 1 The second rubber sheet 2 shown in the figure, the hook body mold II 55 and the hook body mold I 44 are located on the opposite sides and processed to form Figure 1 The first type of rubber sheet 1 shown is inserted into the hook body mold II 55 in a direction adjusted according to the type of rubber sheet to be processed;

[0043] Start the power mechanism I, which is preferably a servo motor. The power mechanism I can be fixedly connected to the sliding track 52. The output shaft of the power mechanism I drives the screw 53 to rotate. When the screw 53 rotates, the outer mold 54 is driven to move through the thread, so that the outer mold 54 moves laterally, so that the outer mold 54 is inserted into the molding groove 33. The depth of the outer mold 54 inserted into the molding groove 33 is adjusted by the power mechanism I, and then the length of the processed rubber is adjusted to meet different processing requirements;

[0044] When the position adjustment of the inner mold 43 and the outer mold 54 is completed, the molten rubber raw material is introduced into the discharge pipe 62, and then the rubber raw material enters the injection cavity 61. The rubber raw material injected into the cavity 61 enters the upper side of the push plate 67 in the receiving groove 65, and the power mechanism II is started. The power mechanism II is preferably a servo motor. The power mechanism II can be fixedly connected to the outer side of the injection cavity 61. The output shaft of the power mechanism II and the rotating ball 64 are connected by transmission. The output shaft of the power mechanism II drives the rotating ball 64 to rotate. The rotating ball 64 drives the rubber raw material located on the upper side to rotate to the lower side, and the telescopic mechanism II 66 is started. The telescopic mechanism II 66 can be a hydraulic cylinder or an electric push rod. The telescopic end of the telescopic mechanism II 66 drives the push plate 67 to move , so that the push plate 67 slides in the receiving groove 65, pushes out the rubber raw material in the receiving groove 65, so that the rubber raw material enters the discharge pipe 63, enters the connecting pipe 45 through the discharge pipe 63, enters the injection hole 34 through the connecting pipe 45, and enters the molding groove 33 between the inner mold 43 and the outer mold 54 through the injection hole 34. Since the injection hole 34 is located at the bottom of the molding groove 33, the rubber raw material also gradually enters the molding groove 33 from the bottom of the molding groove 33, thereby causing the rubber raw material in the molding groove 33 to gradually rise, and less bubbles are generated during the injection process. In addition, this injection method can ensure that the rubber raw material flows between the hook body mold Ⅰ44 and the hook body mold Ⅱ55 to form a connecting hook body Ⅰ11 or a connecting hook body Ⅱ21;

[0045] Furthermore, the extension length of the telescopic end of the telescopic mechanism II 66 is controlled, thereby controlling the amount of rubber raw material injected, thereby controlling the height of the rubber raw material in the molding groove 33, thereby controlling the width of the formed rubber sheet;

[0046] Furthermore, after the processing is completed and the cooling is performed, the power mechanism I is started, and the output shaft of the power mechanism I rotates to drive the outer mold 54 to move horizontally, and the telescopic mechanism I 42 is started. The telescopic mechanism I 42 can be a hydraulic cylinder or an electric push rod. The telescopic end of the telescopic mechanism I 42 drives the inner mold 43 to move, so that the inner mold 43 and the outer mold 54 drive the molded rubber sheet to move out of the molding groove 33, and pull the rubber sheet upward or downward, so that the rubber sheet falls off from between the inner mold 43 and the outer mold 54, and the demolding is completed;

[0047] Furthermore, in order to automatically control the width of the rubber sheet according to the use requirements, the rotating ball 64 is fixedly connected to a rotating seat 610, and the rotating seat 610 is fixedly connected to two telescopic mechanisms III 68, and the telescopic ends of the two telescopic mechanisms III 68 are fixedly connected to sensors 69, and the two sensors 69 are respectively connected to the two telescopic mechanisms II 66;

[0048] The outer mold 54 is slidably connected with a sliding column 56, and the front and rear ends of the sliding column 56 are fixedly connected with a boat-shaped plate 57. A compression spring is fixedly connected between the boat-shaped plate 57 and the outer mold 54, and the boat-shaped plate 57 can contact the sensor 69 located at the lower side;

[0049] When the depth of the outer mold 54 inserted into the molding groove 33 is adjusted by the power mechanism I, the ship-shaped plate 57 will squeeze the sensor 69. The sensor 69 is preferably a pressure sensor. The sensor 69 is connected to the telescopic mechanism II 66, which is also located at the lower side, through the conventional technical means in the art. The sensor 69 controls the telescopic end of the telescopic mechanism II 66 to move. When the pressure on the sensor 69 is greater, the sensor 69 controls the telescopic end of the telescopic mechanism II 66 to extend longer. Then, when the position of the outer mold 54 is determined, the telescopic mechanism III 68 is started. The telescopic mechanism III 68 can be a hydraulic cylinder or an electric push rod. The telescopic end of the telescopic mechanism III 68 drives the sensor 69 to move, and then adjusts the position of the sensor 69, and then adjusts the pressure on the sensor 69 after the outer mold 54 moves to the specified position, that is, after the length of the rubber is determined, and then controls the length of the telescopic end of the telescopic mechanism III 68, and then controls the amount of rubber raw material injected, and then controls the width of the rubber plate, that is, the height of the upper horizontal surface of the rubber raw material, so as to meet different processing requirements;

[0050] Furthermore, when one rubber sheet needs to be processed after one rubber sheet is processed, the power mechanism II is started, and the output shaft of the power mechanism II drives the rotating ball 64 to rotate, so as to complete the replacement of the positions of the two telescopic mechanisms II 66. At the same time, the rotating ball 64 drives the rotating seat 610 to rotate, and the rotating seat 610 drives the telescopic mechanism III 68 and the sensor 69 to move, so that the telescopic mechanism II 66 originally located on the upper side moves to the lower side, and the telescopic mechanism II 66 originally located on the lower side moves to the upper side. Since the sensor 69 located on the upper side is no longer squeezed at this time, the telescopic end of the telescopic mechanism II 66 is reset, and the sensor 69 located on the lower side is squeezed at this time, thereby controlling the telescopic end of the telescopic mechanism II 66 located on the lower side to move, and completing the injection of the rubber raw material. In this way, the cyclic processing is completed, that is, the length and width of the rubber can be controlled according to the use requirements, and the cyclic processing of the rubber sheet can also be completed to ensure the processing efficiency;

[0051] A method for preparing rubber, the method comprising the following steps:

[0052] Step 1: According to the type of rubber sheet to be processed, adjust whether the hook body mold II 55 set on the outer mold 54 is located on the same side as the hook body mold I 44 on the inner mold 43; Figure 2 As shown, the hook body mold II 55 and the hook body mold I 44 are located on the same side and processed to form Figure 1 The second rubber sheet 2 shown in the figure, the hook body mold II 55 and the hook body mold I 44 are located on the opposite sides and processed to form Figure 1 The first rubber sheet 1 shown;

[0053] Step 2: According to the length requirement of the processed rubber sheet, the distance between the inner mold 43 and the outer mold 54 in the molding groove 33 is adjusted; the power mechanism I is started to make the outer mold 54 move laterally so that the outer mold 54 is inserted into the molding groove 33, and the depth of the outer mold 54 inserted into the molding groove 33 is adjusted by the power mechanism I, thereby adjusting the length of the processed rubber to meet different processing requirements;

[0054] Step three: inject the molten rubber raw material into between the inner mold 43 and the outer mold 54 through the injection hole 34 to form the first rubber sheet 1 or the second rubber sheet 2; the rubber raw material enters between the inner mold 43 and the outer mold 54 in the molding groove 33 through the injection hole 34, and the rubber raw material flows into between the hook body mold Ⅰ44 and the hook body mold Ⅱ55 to form the connecting hook body Ⅰ11 or the connecting hook body Ⅱ21.

[0055] like Figures 1 to 4As shown, a rubber is a first rubber sheet 1 and a second rubber sheet 2, both ends of the first rubber sheet 1 are provided with connecting hooks Ⅰ11, and the two connecting hooks Ⅰ11 are respectively located on both sides of the first rubber sheet 1, and both ends of the second rubber sheet 2 are provided with connecting hooks Ⅱ21, and the two connecting hooks Ⅱ21 are located on the same side of the first rubber sheet 1;

[0056] When using, Figure 1 and Figure 2 As shown, when it is necessary to complete the connection between two rubbers, the connecting hook body I11 of the first rubber sheet 1 and the connecting hook body II21 of the second rubber sheet 2 can be engaged with each other, the connecting hook body I11 of one first rubber sheet 1 can be engaged with the connecting hook body I11 of another first rubber sheet 1, and the connecting hook body II21 of one second rubber sheet 2 can be engaged with the connecting hook body II21 of another second rubber sheet 2;

[0057] Here, the connection hook body Ⅰ11 and the connection hook body Ⅱ21 are engaged with each other as an example. Figure 2 As shown, the elasticity of the rubber is used to make the connecting hook body Ⅰ11 and the connecting hook body Ⅱ21 hooked together to complete the front-back and up-down positioning. Due to the friction of the rubber itself, the lateral dislocation sliding of the first rubber sheet 1 and the second rubber sheet 2 can also be blocked to complete the connection between the first rubber sheet 1 and the second rubber sheet 2.

[0058] Here, the first rubber sheet 1 is connected to the first rubber sheet 1, and the difference from the second rubber sheet 2 and the second rubber sheet 2 is that, when the first rubber sheet 1 is connected to the first rubber sheet 1, the two connecting hooks Ⅰ11 on the first rubber sheet 1 are misaligned, and the two connecting hooks Ⅰ11 are respectively located on both sides of the first rubber sheet 1, and then after the splicing of multiple first rubber sheets 1 is completed, the multiple first rubber sheets 1 are stacked on each other, and the first rubber sheets 1 need to be removed one by one during disassembly, such a connection will be more stable, but difficult to disassemble; the second rubber sheet 2 is connected to the second rubber sheet 2, and the two connecting hooks Ⅱ21 on the second rubber sheet 2 are located on the same side, and then after the multiple second rubber sheets 2 are spliced, the multiple second rubber sheets 2 are not stacked on each other, and any second rubber sheet 2 can be removed during disassembly, such a connection is not as stable as the connection between two first rubber sheets 1, but it is easy to disassemble, and the use of the second rubber sheet 2 and the first rubber sheet 1 can be selected according to usage requirements.

Claims

1. A rubber preparation device, comprising a forming ring (32), characterized in that: The molding ring (32) is provided with a plurality of molding grooves (33), and the bottom of the molding ring (32) is provided with a plurality of injection holes (34), the plurality of injection holes (34) are respectively connected to the plurality of molding grooves (33), and the molding grooves (33) are slidably connected with an inner mold (43) and an outer mold (54).

2. A rubber preparation device according to claim 1, characterized in that: The molding ring (32) is fixedly connected to the mounting bracket (31), a mounting plate (41) is fixedly connected inside the molding ring (32), a plurality of telescopic mechanisms I (42) are fixedly connected to the mounting plate (41), an inner mold (43) is fixedly connected to the telescopic end of the telescopic mechanism I (42), and a hook body mold I (44) is arranged on the inner mold (43).

3. A rubber preparation device according to claim 2, characterized in that: A plurality of flip motors (51) are fixedly connected to the mounting bracket (31), and a sliding track (52) is fixedly connected to the output shaft of each flip motor (51), and a screw rod (53) is rotatably connected to the sliding track (52), and an outer mold (54) is slidably connected to the sliding track (52), and the outer mold (54) is connected to the screw rod (53) by means of threads, and hook body molds II (55) are fixedly connected to the front and rear ends of the outer mold (54), and the two hook body molds II (55) are oriented on the same side of the outer mold (54).

4. A rubber preparation device according to claim 3, characterized in that: The sliding track (52) is fixedly connected with a power mechanism I for driving the screw rod (53) to rotate.

5. A rubber preparation device according to claim 3, characterized in that: The bottom of the molding ring (32) is fixedly connected to a plurality of connecting pipes (45) communicating with a plurality of injection holes (34); each connecting pipe (45) is fixedly connected to a discharge pipe (63); each discharge pipe (63) is fixedly connected to an injection cavity (61); each injection cavity (61) is fixedly connected to a discharge pipe (62); a rotating ball (64) is rotatably connected in the injection cavity (61); a receiving groove (65) is provided on the rotating ball (64); two telescopic mechanisms II (66) are fixedly connected in the receiving groove (65); and a push plate (67) is fixedly connected to the telescopic end of each telescopic mechanism II (66).

6. A rubber preparation device according to claim 5, characterized in that: The injection cavity (61) is fixedly connected to a power mechanism II for driving the rotating ball (64) to rotate.

7. A rubber preparation device according to claim 6, characterized in that: The rotating sphere (64) is fixedly connected to a rotating seat (610), and two telescopic mechanisms III (68) are fixedly connected to the rotating seat (610). Sensors (69) are fixedly connected to the telescopic ends of the two telescopic mechanisms III (68), and the two sensors (69) are respectively connected to the two telescopic mechanisms II (66).

8. A rubber preparation device according to claim 7, characterized in that: A sliding column (56) is slidably connected to the outer mold (54), and a ship-shaped plate (57) is fixedly connected to both the front and rear ends of the sliding column (56). A compression spring is fixedly connected between the ship-shaped plate (57) and the outer mold (54), and the ship-shaped plate (57) can contact the sensor (69) located at the lower side.

9. A method for preparing rubber using the rubber preparation device according to claim 3, characterized in that: The method comprises the following steps: Step 1: According to the type of rubber sheet to be processed, the hook body mold II (55) arranged on the outer mold (54) is adjusted to be located on the same side as the hook body mold I (44) on the inner mold (43); Step 2: adjusting the distance between the inner mold (43) and the outer mold (54) in the molding groove (33) according to the length requirement of the processed rubber sheet; Step three: injecting the molten rubber raw material into between the inner mold (43) and the outer mold (54) through the injection hole (34) to form the first rubber sheet (1) or the second rubber sheet (2).

10. The rubber prepared by the rubber preparation device according to claim 3, characterized in that: The rubber comprises a first type rubber plate (1) and a second type rubber plate (2). Both ends of the first type rubber plate (1) are provided with connecting hook bodies I (11), and the two connecting hook bodies I (11) are respectively located on both sides of the first type rubber plate (1). Both ends of the second type rubber plate (2) are provided with connecting hook bodies II (21), and the two connecting hook bodies II (21) are both located on the same side of the first type rubber plate (1).

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