Plastic raw material dehumidification mixing device

Abstract

The application relates to the plastic raw material mixing technology field, in particular to a plastic raw material dehumidification mixing device, a heating plate is arranged at the bottom of a mixing kettle, the heating temperature can be controlled to compensate for the insufficient heat generated by plastic mixing friction, the accelerated water evaporation of plastic raw material mixing is ensured, a feeding door is arranged at the top of the mixing kettle, a water absorption pad is arranged on the inner wall of the top of the feeding door and fixed on the inner wall of the top of the feeding door through a bearing frame, the hollow structure of the bearing frame enlarges the water vapor contact area, the positioning column of the bearing frame and the positioning hole of the water absorption pad are inserted and matched to reduce the deviation of the water absorption pad, the water vapor in the closed mixing environment is effectively absorbed, the water pollution of the plastic mixing is reduced, and the quality of the plastic products is improved.

Description

Technical Field

[0001] This application relates to the field of plastic raw material mixing technology, and in particular to a plastic raw material dehumidification mixing device. Background Technology

[0002] Plastic raw material mixing process refers to the technical process of physically blending base resin with various functional plastic additives in proportion according to specific needs, and finally forming a composite mixture with stable processing characteristics, making the plastic itself more durable.

[0003] In related technologies, plastic mixtures are heated by high-speed stirring, which promotes the crushing and pre-plasticization of plastic particles and their uniform coating with plastic, ensuring the stability and flowability of the mixture.

[0004] However, this method has the following drawbacks: during the plastic mixing process, although frictional heat can promote material mixing and pre-plasticization, it is not enough to evaporate all the moisture. The existing mixing tank has a closed top opening during mixing, which may cause moisture to remain in the plastic mixing process, thus affecting the quality of plastic products. Utility Model Content

[0005] To address the aforementioned problems, this application provides a plastic raw material dehumidification and mixing device.

[0006] The plastic raw material dehumidification and mixing device provided in this application adopts the following technical solution:

[0007] A plastic raw material dehumidification and mixing device includes a base, a mixing tank, a heating plate, and a water-absorbing pad. The base supports the mixing tank and has a hollow interior. The heating plate is located at the bottom of the mixing tank and is fixedly connected to the bottom surface of the mixing tank. The water-absorbing pad is located on the inner wall of the top of the mixing tank.

[0008] By adopting the above technical solution, the heating plate at the bottom of the mixing tank can control the heating temperature, effectively making up for the insufficient frictional heat generation of the plastic mixture, ensuring that the plastic mixture is fully plasticized and accelerating the evaporation of moisture. When mixing, the top opening of the mixing tank is sealed, so moisture cannot evaporate from the mixing tank. The water-absorbing pad set on the inner wall of the top can absorb the water vapor evaporated from the water, reducing moisture contamination of the plastic mixture and improving the quality of plastic products.

[0009] Preferably, the absorbent pad is a high-temperature resistant sponge, which is disposed on the inner wall of the top of the mixing tank.

[0010] By adopting the above technical solution, the high-temperature resistant sponge can absorb the water vapor volatilized during the plastic mixing process, and the temperature resistance of the high-temperature resistant sponge can reduce the occurrence of carbonization failure of the high-temperature resistant sponge under high temperature environment.

[0011] Preferably, the mixing vessel has a feed inlet at the top and a feed gate on the outer wall of the top of the mixing vessel, the feed gate being used to cover the feed inlet.

[0012] By adopting the above technical solution, the feed gate covers the feed inlet, maintaining a high-temperature environment inside the mixing tank, while reducing the entry of external moisture into the mixing tank.

[0013] Preferably, it also includes a fixing component, which is disposed on the inner wall of the top of the feed gate. The fixing component includes a support frame and a snap-fit ​​component. The snap-fit ​​component is fixedly connected to the support frame. The support frame has a hollow structure. The inner wall of the top of the feed gate is provided with a snap-fit ​​groove. The support frame is fixed to the inner wall of the top of the feed gate by snap-fitting the snap-fit ​​component with the snap-fit ​​groove. The water-absorbing pad is built into the support frame.

[0014] By adopting the above technical solution, the absorbent pad is built into the support frame, and the support frame is fixed to the inner wall of the top of the feed gate by snap-fitting the snap-fitting slot. This ensures the stability of the absorbent pad during the high-speed mixing process and reduces the occurrence of the absorbent pad falling off or shifting. The hollow structure of the support frame also increases the contact area of ​​the absorbent pad, allowing it to more fully contact and capture the moisture generated during the mixing process, thereby improving the dehumidification efficiency. Furthermore, the snap-fitting of the snap-fitting slot enables the support frame to be detachably connected, allowing the absorbent pad to be replaced at any time.

[0015] Preferably, the support frame is provided with a positioning post, and the absorbent pad is provided with a positioning hole, which is inserted into the positioning post.

[0016] By adopting the above technical solution, the insertion and connection of the positioning post and the positioning hole achieves precise positioning and stable fixation of the absorbent pad through a physical limiting structure. This effectively reduces the pad displacement caused by mechanical vibration or material impact during the mixing of plastic raw materials. The insertion and connection of the positioning hole and the positioning post simplifies the installation process. Operators only need to align the positioning hole with the positioning post to quickly install the absorbent pad on the support frame, reducing the tedious steps of repeated adjustments required by traditional fixing methods and improving the convenience and efficiency of equipment maintenance.

[0017] Preferably, the mixing vessel is equipped with a stirring assembly, which includes a rotating impeller that is rotatably supported on the bottom surface of the mixing vessel.

[0018] By adopting the above technical solution, the rotating impeller mixes the plastic raw materials, reducing material clumping or stratification, improving mixing uniformity, and achieving efficient mixing of materials.

[0019] Preferably, the stirring assembly further includes a drive motor and a rotating shaft. The drive motor is located next to the mixing vessel and rotatably supported on the base. The rotating impeller is sleeved on the rotating shaft and coaxially fixed to it. The rotating shaft passes through the bottom of the mixing vessel. A transmission assembly is provided between the drive motor and the rotating shaft. The transmission assembly includes a belt and pulleys. There are two pulleys. One pulley is coaxially fixed to the output shaft of the drive motor, and the other pulley is coaxially fixed to the rotating shaft. The belt is sleeved on the pulley.

[0020] By adopting the above technical solution, the transmission component achieves synchronous linkage between the drive motor and the rotating shaft through the synergistic effect of the pulley and belt. The drive motor transmits rotational power to the rotating shaft through the transmission component, ensuring the speed matching of the drive motor and the rotating shaft. Since the rotating impeller is coaxially fixed with the rotating shaft, it further drives the rotating impeller to rotate inside the mixing tank for mixing, thereby improving the uniformity of plastic raw material mixing.

[0021] Preferably, the base is provided with rollers at each of the four corners, and the rollers are omnidirectional wheels.

[0022] By adopting the above technical solution and configuring rollers at the four corners of the base, it is easy to quickly adjust the position or transfer the work station on the production site, realizing the flexible movement and precise positioning of the heating plastic raw material mixing device. The casters have a self-locking function, which can be firmly fixed during equipment operation and reduce the risk of displacement caused by mixing vibration.

[0023] Preferably, the outer wall of the mixing vessel is provided with a discharge port, which is in communication with the interior of the mixing vessel.

[0024] By adopting the above technical solution, the discharge port is connected to the inside of the mixing tank, so that the mixed plastic mixture can be smoothly output from the mixing tank and transferred to the next process.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. By supplementing heat through the bottom heating plate to accelerate the evaporation of moisture in the plastic raw material mixture, and by using the top absorbent pad to absorb the moisture evaporated in the closed environment, the quality of plastic products is significantly improved.

[0027] 2. The inner wall of the top of the mixing tank is lined with high-temperature resistant sponge, which can efficiently absorb the evaporated water vapor and reduce the carbonization failure of the high-temperature resistant sponge under high temperature environment, thus ensuring continuous and stable water vapor absorption.

[0028] 3. The support frame is fixed to the inner wall of the top of the feed door by snap-fitting the snap-fitting slot, which increases the water vapor contact area and improves the dehumidification efficiency, and also makes it easy to replace. At the same time, it ensures the stability of the water absorption pad during the high-speed mixing process and reduces the occurrence of water absorption pad falling off or shifting. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0030] Figure 2 This is a schematic diagram of the installation of the mixing tank, heating plate, and drive motor in an embodiment of this application.

[0031] Figure 3 This is a schematic diagram of the stirring assembly in an embodiment of this application.

[0032] Figure 4 This is a schematic diagram of the back structure in an embodiment of this application.

[0033] Figure 5 Figure 4 An enlarged diagram of A in the diagram.

[0034] Figure 6 This is a schematic diagram of the structure of the fixed component in the embodiments of this application.

[0035] Figure 7 yes Figure 6 Enlarged diagram of B in the diagram.

[0036] Explanation of reference numerals in the attached drawings: 1. Base; 2. Mixing vessel; 3. Heating plate; 4. Water-absorbing pad; 41. Positioning hole; 5. Stirring assembly; 51. Rotating impeller; 52. Rotating shaft; 53. Drive motor; 6. Feed inlet; 7. Feed gate; 71. Snap-fit ​​groove; 8. Fixing assembly; 81. Support frame; 811. Positioning column; 82. Snap-fit ​​piece; 821. Snap-fit ​​strip; 822. Snap-fit ​​block; 9. Roller; 10. Transmission assembly; 101. Belt; 102. Pulley; 11. Discharge port. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0038] This application discloses a dehumidification and mixing device for plastic raw materials. (Refer to...) Figure 1 and Figure 2 A plastic raw material dehumidification and mixing device includes a base 1, a mixing vessel 2, and a heating plate 3. The mixing vessel 2 is cylindrical, and the base 1 supports the mixing vessel 2. The interior of the base 1 is hollow. The heating plate 3 is located at the bottom of the mixing vessel 2 and is fixedly connected to the bottom surface of the mixing vessel 2.

[0039] This demonstrates that the heating plate 3 at the bottom of the mixing tank 2 can control the heating temperature, effectively compensate for insufficient frictional heat generation in the plastic mixture, ensure that the plastic mixture is fully plasticized and accelerates moisture evaporation.

[0040] Specifically, the frame of base 1 is rectangular in shape, and the upper surface of base 1 has a notch with a diameter smaller than the bottom diameter of mixing tank 2. The interior of base 1 is hollow, and rollers 9 are provided at the four corners of base 1. The rollers 9 are universal wheels, and the four corners of base 1 are equipped with rollers 9 to facilitate quick adjustment of position or transfer of workstations on the production site. This enables flexible movement and precise positioning of the heating plastic raw material mixing device. The universal wheels have a self-locking function, which can be firmly fixed during equipment operation and reduce the risk of displacement caused by mixing vibration.

[0041] Reference Figure 3 Furthermore, a plastic raw material dehumidification and mixing device also includes a stirring assembly 5. The stirring assembly 5 includes a drive motor 53 and a rotating shaft 52. The drive motor 53 is located next to the mixing tank 2 and is rotatably supported on the base 1. The rotating impeller 51 is sleeved on the rotating shaft 52 and is coaxially fixed with the rotating shaft 52. The rotating shaft 52 passes through the bottom of the mixing tank 2. A transmission assembly 10 is provided between the drive motor 53 and the rotating shaft 52. The transmission assembly 10 includes a belt 101 and a pulley 102. There are two pulleys 102. One pulley 102 is coaxially fixed with the output shaft of the drive motor 53, and the other pulley 102 is coaxially fixed with the rotating shaft 52. The belt 101 is sleeved on the pulley 102.

[0042] In addition, in this embodiment, two rotating impellers 51 are provided. Both rotating impellers 51 are built into the inside of the mixing tank 2. The two rotating impellers 51 are sleeved on the rotating shaft 52 and fixed coaxially with the rotating shaft 52.

[0043] This demonstrates that the transmission assembly 10, through the synergistic action of the pulley 102 and the belt 101, enables the synchronous operation of the drive motor 53 and the rotating shaft 52. The drive motor 53 transmits rotational power to the rotating shaft 52 through the transmission assembly 10, ensuring the speed matching between the drive motor 53 and the rotating shaft 52. Since the rotating impeller 51 is coaxially fixed with the rotating shaft 52, it further drives the rotating impeller 51 to rotate inside the mixing tank 2 to mix materials, thereby improving the uniformity of the plastic raw material mixing.

[0044] Meanwhile, the heating plate 3 is circumferentially along the rotation axis 52 of the bottom outer wall of the mixing vessel 2. The heating temperature of the plastic raw material mixing is set according to the type of plastic raw material. The heating plate 3 controls the heating temperature according to the heating requirements of the type of plastic raw material, effectively making up for the insufficient frictional heat generation of the plastic mixing. In this embodiment, a fourth heating plate 3 is provided. The heating plate 3 is fixedly connected to the bottom outer wall of the mixing vessel 2. The heating plate 3 radiates heat into the mixing vessel by heat conduction.

[0045] Reference Figure 4 On the other hand, the top of the mixing tank 2 is provided with a feed inlet 6, which is circular in shape. At the same time, the top of the mixing tank 2 is also provided with a feed gate 7, which is used to cover the feed inlet 6. The outer wall of the feed inlet 6 abuts against the bottom inner wall of the feed gate 7.

[0046] Specifically, the feed gate 7 includes two identical semi-circular plates, with their straight edges hinged together. When closed, the inner walls of the arc edges of the two gates abut against the outer wall of the feed inlet 6. To check the mixing of the plastic raw materials, one of the semi-circular plates can be opened. The semi-circular plate can be opened individually by using the hinge axis that connects the straight edges of the two semi-circular plates. When feeding material into the mixing tank 2, the semi-circular plate can be opened for feeding. The feed gate 7 maintains a high-temperature environment inside the mixing tank 2 and reduces the entry of external moisture into the mixing tank 2.

[0047] Reference Figure 5 and Figure 6 Furthermore, a plastic raw material dehumidification and mixing device also includes a fixing component 8 and a water-absorbing pad 4. In this embodiment, the fixing component 8 is provided in two sets, which are respectively fixed on the inner wall of the top of the two semi-circular plates.

[0048] Specifically, the fixing component 8 includes a support frame 81 and a snap-fit ​​component 82. The water-absorbing pad 4 is built into the support frame 81. Since the top feed port 6 of the mixing tank 2 is sealed when mixing, the water cannot evaporate from the mixing tank 2. The water-absorbing pad 4 set on the inner wall of the top can absorb the water vapor evaporated from the water, reduce water contamination of the plastic mixture, and improve the quality of the plastic products.

[0049] Furthermore, the snap-fit ​​component 82 includes a snap-fit ​​strip 821 and a snap-fit ​​block 822. The snap-fit ​​strip 821 and the snap-fit ​​block 822 are fixedly connected. In this embodiment, two snap-fit ​​components 82 are provided. The side of the snap-fit ​​strip 821 away from the snap-fit ​​block 822 is fixedly connected to both sides of the edge of the support frame 81. The support frame 81 has a hollow structure and is used to house the water-absorbing pad 4. The inner walls of the top of the two semi-circular plates are provided with snap-fit ​​grooves 71. There are two snap-fit ​​grooves 71. The support frame 81 is fixed to the inner wall of the top of the feed door 7 by snap-fitting the snap-fit ​​block 822 with the snap-fit ​​groove 71. During the snap-fitting process of the snap-fit ​​block 822 and the snap-fit ​​groove 71, the snap-fit ​​block 822 undergoes elastic deformation and passes through the snap-fit ​​groove 71. The side wall of the snap-fit ​​groove 71 abuts against the outer wall of the feed door 7.

[0050] This demonstrates that the absorbent pad 4 is built into the support frame 81. The support frame 81 is fixed to the inner wall of the top of the feed gate 7 by the snap-fit ​​block 822 of the snap-fit ​​member 82 and the snap-fit ​​groove 71. This ensures the stability of the absorbent pad 4 during the high-speed mixing process and reduces the occurrence of the absorbent pad 4 falling off or shifting. The hollow structure of the support frame 81 also increases the contact area of ​​the absorbent pad 4, allowing the absorbent pad 4 to more fully contact and capture the moisture generated during the mixing process, thereby improving the dehumidification efficiency.

[0051] Reference Figure 7 Furthermore, a positioning post 811 is fixedly provided on the inner wall of the support frame 81. The positioning post 811 is vertically connected to the support frame 81. In this embodiment, there are two positioning posts 811 and two positioning holes 41 are provided on the water-absorbing pad 4. The positioning posts 811 are inserted into the positioning holes 41.

[0052] This demonstrates that the insertion and engagement of the positioning post 811 and the positioning hole 41 physically limits the water-absorbing pad 4, achieving precise positioning and stable fixation of the water-absorbing pad 4. This effectively reduces the pad's displacement caused by mechanical vibration or material impact during the mixing of plastic raw materials. The insertion and engagement of the positioning hole 41 and the positioning post 811 simplifies the installation process. Operators only need to align the positioning hole 41 with the positioning post 811 to quickly install the water-absorbing pad 4 onto the support frame 81, reducing the tedious steps of repeated adjustments required by traditional fixing methods and improving the convenience and efficiency of equipment maintenance.

[0053] In addition, the absorbent pad 4 is made of high-temperature resistant sponge. The material of the high-temperature resistant sponge is polyimide foam. Under normal circumstances, the heating temperature of plastic raw material mixing is set according to the type of plastic raw material. The heating temperature is usually in the range of 100-300℃. Polyimide foam can withstand 200℃ for long-term use and 300℃ for instantaneous use. At the same time, the water absorption rate is up to 10 times its own weight. It has good air permeability. The high-temperature resistant sponge can absorb water vapor volatilized during plastic mixing. At the same time, the high temperature resistance of the high-temperature resistant sponge can reduce the occurrence of carbonization failure of the high-temperature resistant sponge under high temperature environment.

[0054] In addition, the outer wall of the mixing tank is equipped with a discharge port, which is connected to the inside of the mixing tank, so that the mixed plastic material can be smoothly output from the mixing tank and transferred to the next process.

[0055] The implementation principle of the plastic raw material dehumidification and mixing device in this application embodiment is as follows:

[0056] A plastic raw material dehumidification and mixing device achieves efficient mixing and dehumidification of plastic raw materials through the synergistic effect of the annular heating plate at the bottom of the mixing tank and the high-temperature resistant water-absorbing pad at the top.

[0057] A plastic raw material dehumidification and mixing device includes a base, a heating plate, and a mixing tank. The base supports the mixing tank and has a hollow interior. Rollers are provided at the four corners of the base. The rollers are universal wheels, and the four corners of the base are equipped with rollers to facilitate quick adjustment of position or transfer of workstations on the production site.

[0058] The heating plate is arranged circumferentially along the bottom of the mixing tank. The heating temperature is set according to the type of plastic raw material. During operation, the heating plate radiates heat into the mixing tank by heat conduction, which makes up for the lack of heat generated by the friction of the plastic raw material stirring, ensuring that the plastic mixture is fully plasticized and accelerating the evaporation of moisture.

[0059] The mixing vessel is equipped with a feed inlet, which has a feed gate. The absorbent pad is fixed to the inner wall of the top of the feed gate by a fixing component. The fixing component includes a support frame and a snap-fit ​​component. The feed gate is equipped with a snap-fit ​​groove. The absorbent pad is built into the support frame and is fixed by snap-fitting the snap-fit ​​component into the snap-fit ​​groove.

[0060] During the mixing process, the heating plate radiates heat into the mixing tank via heat conduction, accelerating moisture evaporation. The absorbent pad is made of high-temperature resistant sponge, which can absorb the water vapor volatilized during plastic mixing. At the same time, the high temperature resistance of the sponge can reduce the occurrence of carbonization failure of the absorbent pad under high temperature environment. After the absorbent pad is saturated, it can be quickly replaced by disassembling the support frame. The support frame has a hollow structure, which increases the effective contact area of ​​the absorbent pad. The inner wall of the support frame is fixed with positioning posts, which are vertically connected to the support frame. The absorbent pad is provided with positioning holes, and the positioning posts are inserted into the positioning holes to reduce the displacement of the absorbent pad within the support frame.

[0061] In addition, a plastic raw material dehumidification and mixing device also includes a stirring assembly, which includes a drive motor and a rotating shaft. The drive motor is located next to the mixing tank and is rotatably supported on the base. A rotating impeller is sleeved on the rotating shaft and fixed coaxially with the rotating shaft. The rotating shaft passes through the bottom of the mixing tank. A transmission assembly is provided between the drive motor and the rotating shaft. The transmission assembly includes a belt and pulleys. There are two pulleys. One pulley is fixed coaxially with the output shaft of the drive motor, and the other pulley is fixed coaxially with the rotating shaft. The belt is sleeved on the pulley. There are two rotating impellers. Both rotating impellers are built into the inside of the mixing tank. The two rotating impellers are sleeved on the rotating shaft and fixed coaxially with the rotating shaft.

[0062] The transmission component achieves synchronous operation of the drive motor and the rotating shaft through the synergistic action of the pulley and belt. The drive motor transmits rotational power to the rotating shaft through the transmission component, ensuring that the speed of the drive motor and the rotating shaft are matched. Since the rotating impeller is coaxially fixed with the rotating shaft, it further drives the rotating impeller to rotate inside the mixing tank to mix the materials, thereby improving the uniformity of the plastic raw material mixing.

[0063] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A plastic raw material dehumidification and mixing device, characterized in that, The device includes a base (1), a mixing vessel (2), a heating plate (3), and a water-absorbing pad (4). The base (1) supports the mixing vessel (2) and the interior of the base (1) is hollow. The heating plate (3) is located at the bottom of the mixing vessel (2) and is fixedly connected to the bottom surface of the mixing vessel (2). The water-absorbing pad (4) is located on the inner wall of the top of the mixing vessel (2).

2. The plastic raw material dehumidification and mixing device according to claim 1, characterized in that, The absorbent pad (4) is a high-temperature resistant sponge, which is placed on the inner wall of the top of the mixing tank (2).

3. The plastic raw material dehumidification and mixing device according to claim 1, characterized in that, The mixing vessel (2) has a feed inlet (6) at the top and a feed gate (7) on the outer wall of the top of the mixing vessel (2). The feed gate (7) is used to cover the feed inlet (6).

4. The plastic raw material dehumidification and mixing device according to claim 3, characterized in that, It also includes a fixing component (8), which is disposed on the inner wall of the top of the feed gate (7). The fixing component (8) includes a support frame (81) and a snap-fit ​​component (82). The snap-fit ​​component (82) is fixedly connected to the support frame (81). The support frame (81) has a hollow structure. The inner wall of the top of the feed gate (7) is provided with a snap-fit ​​groove (71). The support frame (81) is fixed on the inner wall of the top of the feed gate (7) by snap-fitting the snap-fit ​​component (82) and the snap-fit ​​groove (71). The water-absorbing pad (4) is built into the support frame (81).

5. The plastic raw material dehumidification and mixing device according to claim 4, characterized in that, The support frame (81) is provided with a positioning post (811), and the absorbent pad (4) is provided with a positioning hole (41), which is inserted into the positioning post (811).

6. The plastic raw material dehumidification and mixing device according to claim 1, characterized in that, The mixing vessel (2) is equipped with a stirring assembly (5), which includes a rotating impeller (51) that is rotatably supported on the bottom upper surface of the mixing vessel (2).

7. The plastic raw material dehumidification and mixing device according to claim 6, characterized in that, The stirring assembly (5) further includes a drive motor (53) and a rotating shaft (52). The drive motor (53) is located next to the mixing tank (2) and is rotatably supported on the base (1). The rotating impeller (51) is sleeved on the rotating shaft (52) and is coaxially fixed with the rotating shaft (52). The rotating shaft (52) passes through the bottom of the mixing tank. A transmission assembly (10) is provided between the drive motor (53) and the rotating shaft (52). The transmission assembly (10) includes a belt (101) and a pulley (102). There are two pulleys (102). One pulley (102) is coaxially fixed with the output shaft of the drive motor (53), and the other pulley (102) is coaxially fixed with the rotating shaft (52). The belt (101) is sleeved on the pulley (102).

8. The plastic raw material dehumidification and mixing device according to claim 1, characterized in that, The base (1) is provided with rollers (9) at each of the four corners, and the rollers (9) are set as universal wheels.

9. The plastic raw material dehumidification and mixing device according to claim 1, characterized in that, The mixing vessel (2) has an outlet (11) on its outer wall, and the outlet (11) is connected to the interior of the mixing vessel (2).

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