Quantitative powder feeding mechanism

Abstract

The utility model relates to the technical field of 3D (three-dimensional) printers, in particular to a quantitative powder feeding mechanism, which comprises a main body component, a powder feeding component, a powder feeding component and a powder feeding component, the control component comprises an output component arranged outside the body component, a guide component arranged in the output component and a counterweight component arranged outside the output component. According to the utility model, articles with corresponding weights are placed in the counterweight component, and then materials are conveyed into the 3D printer through the body component; when the weight borne by the shielding assembly is larger than the weight placed in the balance weight assembly, the shielding assembly can be opened and drive the guide assembly to rotate, meanwhile, the guide assembly can abut against the output assembly to lift the balance weight assembly, and after internal materials are unloaded, the balance weight assembly can reset. And meanwhile, the output assembly is driven to abut against the guide assembly and the shielding assembly to shield the discharging end of the body assembly, and therefore the purpose of quantitative powder feeding of the body assembly is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printers, in particular to a powder feeding mechanism with a fixed quantity. Background Art

[0002] 3D printing (3DP) is a kind of rapid prototyping technology, also known as additive manufacturing. It is a technology that constructs an object by layer-by-layer printing based on a digital model file, using powdery metals, plastics, or other bondable materials. 3D printing is usually achieved by using a digital technology material printer. It is often used in the fields of mold manufacturing and industrial design to manufacture models, and then gradually used for the direct manufacturing of some products. There are already parts printed using this technology.

[0003] Currently, during the use of 3D printers, powder needs to be fed into the 3D printers. The powder feeding structure with a traditional structure cannot adjust the amount of powder fed at one time, resulting in the powder being continuously added in a certain amount in a cycle to the corresponding powder amount. When the powder usage requirements for printing different objects by the 3D printer are different, the corresponding powder feeding amount cannot be quickly achieved, thereby reducing the printing efficiency. Content of the Utility Model

[0004] In view of the problem in the above or the prior art that the amount of powder fed at one time cannot be adjusted according to different objects, the present utility model is proposed.

[0005] Therefore, the purpose of the present utility model is to provide a powder feeding mechanism with a fixed quantity.

[0006] To solve the above technical problems, the present utility model provides the following technical solutions: including

[0007] A main body component, including a body assembly and a shielding assembly arranged under the body assembly;

[0008] A control component, including an output assembly arranged outside the body assembly, a guiding assembly arranged inside the output assembly, and a counterweight assembly arranged outside the output assembly.

[0009] As a preferred scheme of the powder feeding mechanism with a fixed quantity of the present utility model, wherein: the body assembly includes a powder feeding box and a feeding pipe arranged at the end of the powder feeding box.

[0010] As a preferred scheme of the powder feeding mechanism with a fixed quantity of the present utility model, wherein: the shielding assembly includes a support arranged outside the feeding pipe, a shaft rod arranged outside the support, and a baffle arranged outside the shaft rod.

[0011] As a preferred solution of the quantitative powder feeding mechanism of the utility model, the output component includes a support rod arranged outside the feed pipe, an output rod arranged outside the support rod, an output block arranged at the end of the output rod, and a limiting groove opened outside the output block.

[0012] As a preferred solution of the quantitative powder feeding mechanism of the utility model, the guide assembly includes an arc-shaped notch plate provided at the end of the shaft rod, an arc-shaped inclined plate provided at the end of the arc-shaped notch plate, and limiting blocks provided at the ends of the arc-shaped notch plate and the arc-shaped inclined plate respectively;

[0013] Wherein, the arc-shaped notched plate and the arc-shaped inclined plate are adapted to the limiting groove.

[0014] As a preferred solution of the quantitative powder feeding mechanism of the utility model, the counterweight assembly includes a mounting block arranged outside the support rod, a mounting groove opened on the mounting block, an L-shaped slide groove opened at the bottom of the mounting block, a limiting groove opened at the end of the mounting block, and a counterweight block arranged in the mounting groove.

[0015] As a preferred solution of the quantitative powder feeding mechanism of the utility model, it further comprises a mounting component;

[0016] It comprises a trigger component arranged in the counterweight component, a fixing component connected to the trigger component, and a plug-in component arranged in the counterweight component.

[0017] As a preferred solution of the quantitative powder feeding mechanism of the utility model, wherein: the trigger assembly includes a trigger rod, an L-shaped connecting plate arranged outside the trigger rod, and a slot opened on the L-shaped connecting plate;

[0018] Wherein, the trigger rod is arranged in the installation groove.

[0019] As a preferred solution of the quantitative powder feeding mechanism of the utility model, the fixing assembly includes a receiving rod arranged at the end of the L-shaped connecting plate, and an arc-shaped fixing plate arranged at the end of the receiving rod.

[0020] As a preferred solution of the quantitative powder feeding mechanism of the utility model, wherein: the plug-in assembly includes a slider, a plug rod arranged at the end of the slider, and a force storage spring arranged between the slider and the limit groove;

[0021] Wherein, the sliding block is arranged in the limiting groove.

[0022] Advantages of the powder feeding mechanism with quantitative delivery of the present utility model: First, place items with corresponding weights in the counterweight assembly, and then convey materials into the 3D printer through the main body assembly. When the weight borne by the shielding assembly is greater than the weight placed in the counterweight assembly, the shielding assembly will open and drive the guiding assembly to rotate around the shielding assembly as the center. At the same time, the guiding assembly can resist the output assembly to lift the counterweight assembly. When the internal materials are emptied, the counterweight assembly will reset and drive the output assembly to resist the guiding assembly and the shielding assembly to block the material discharging end of the main body assembly, thus achieving the purpose of quantitative powder feeding of the main body assembly. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for description in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic diagram of the overall powder feeding mechanism with quantitative delivery.

[0025] Figure 2 It is a schematic diagram of the structure of the shielding assembly of the powder feeding mechanism with quantitative delivery.

[0026] Figure 3 It is a schematic diagram of the structure of the control component of the powder feeding mechanism with quantitative delivery.

[0027] Figure 4 It is a schematic diagram of the structure of the installation component of the powder feeding mechanism with quantitative delivery.

[0028] Figure 5 It is a schematic diagram of the structure of the telescopic rod of the powder feeding mechanism with quantitative delivery Detailed Embodiments

[0029] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe the detailed embodiments of the present utility model with reference to the accompanying drawings of the specification.

[0030] Many specific details are set forth in the following description to facilitate a thorough understanding of the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0031] Secondly, the so-called "one embodiment" or "embodiment" herein refers to specific features, structures or characteristics that may be included in at least one implementation manner of the present utility model. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it an individual or alternative embodiment that is mutually exclusive with other embodiments.

[0032] Embodiment 1, referring to Figure 1 , is the first embodiment of the present utility model. This embodiment provides a quantitative powder feeding mechanism, including a main body component 100, which includes a body assembly 101 and a shielding assembly 102 provided under the body assembly 101; a control component 200, which includes an output assembly 201 provided outside the body assembly 101, a guiding assembly 202 provided inside the output assembly 201, and a counterweight assembly 203 fixedly arranged on one side of the output assembly 201. First, place items of corresponding weights in the counterweight assembly 203, and then convey materials into the 3D printer through the body assembly 101. When the weight borne on the shielding assembly 102 is greater than the weight placed in the counterweight assembly 203, the shielding assembly 102 will open, and drive the guiding assembly 202 to rotate with the shielding assembly 102 as the center of the circle. At the same time, the guiding assembly 202 can abut against the output assembly 201 to lift the counterweight assembly 203. When the internal materials are unloaded, the counterweight assembly 203 will reset, and at the same time drive the output assembly 201 to abut against the guiding assembly 202 and the shielding assembly 102 to shield the feeding end of the body assembly 101, thereby achieving the purpose of quantitative powder feeding of the body assembly 101.

[0033] Embodiment 2, referring to Figures 1 to 3 , is the second embodiment of the present utility model. Different from the previous embodiment, the body assembly 101 includes a powder feeding box 101a and a material conveying pipe 101b provided at the end of the powder feeding box 101a. The shielding assembly 102 includes a support 102a provided outside the material conveying pipe 101b, a shaft rod 102b provided outside the support 102a, and a baffle 102c provided outside the shaft rod 102b. The powder feeding box 101a is used to place materials to be conveyed. The bottom end of the powder feeding box 101a is fixedly connected with a material conveying pipe 101b. The material conveying pipe 101b can transfer the materials in the powder feeding box 101a to the internal processing table of the 3D printer. A pair of supports 102a are fixedly connected to the outside of the material conveying pipe 101b near the discharging end. One end of each of the pair of supports 102a away from each other is rotatably connected with a shaft rod 102b. One end of the pair of shaft rods 102b away from each other is commonly fixedly connected to the inner side of the baffle 102c. The baffle 102c functions to shield the end of the material conveying pipe 101b, and the support 102a functions to support the baffle 102c and the shaft rod 102b. The shaft rod 102b can control the rotational connection between the baffle 102c and the material conveying pipe 101b, so as to achieve the purpose of controlling fixed feeding.

[0034] Further, the output component 201 includes a support rod 201a disposed outside the material conveying pipe 101b, an output rod 201b disposed outside the support rod 201a, an output block 201c disposed at the end of the output rod 201b, and a limiting groove 201d formed outside the output block 201c. The guiding component 202 includes an arc-shaped notch plate 202a disposed at the end of the shaft rod 102b, an arc-shaped inclined plate 202b disposed at the end of the arc-shaped notch plate 202a, and limiting blocks 202c respectively disposed at the ends of the arc-shaped notch plate 202a and the arc-shaped inclined plate 202b. Among them, the arc-shaped notch plate 202a, the arc-shaped inclined plate 202b are adapted to the limiting groove 201d. The end of the material conveying pipe 101b is rotatably connected to the support rod 201a. The side of the end of the support rod 201a is fixedly connected to the output rod 201b. The support rod 201a plays a role in supporting and positioning. The end of the output rod 201b is fixedly connected to the output block 201c. The limiting groove 201d is formed outside the output block 201c. In this way, when controlling the rotation of the support rod 201a, the output rod 201b and the output block 201c can be driven to rotate around the support rod 201a, so as to abut against the guiding component 202, causing the guiding component 202 to drive the shielding component 102 away from the end of the body component 101, thereby releasing the material in the body component 101. The end of one side of the shaft rod 102b penetrates through the inner wall of the baffle 102c and is fixedly connected to the arc-shaped notch plate 202a. The end of the arc-shaped notch plate 202a is fixedly connected to the arc-shaped inclined plate 202b. Limiting blocks 202c are fixedly connected to the ends of the arc-shaped notch plate 202a and the arc-shaped inclined plate 202b. In this way, when the output rod 201b and the output block 201c rotate around the support rod 201a, they can abut against the inner walls of the arc-shaped inclined plate 202b and the arc-shaped notch plate 202a, thereby driving the shaft rod 102b and the baffle 102c to rotate. At this time, the material inside the material conveying pipe 101b will be discharged. The widths of the arc-shaped notch plate 202a and the arc-shaped inclined plate 202b are adapted to the limiting groove 201d, thus achieving the purpose of quantitative feeding.

[0035] Further, the counterweight assembly 203 includes a mounting block 203a disposed outside the support rod 201a, a mounting groove 203b formed in the mounting block 203a, an L-shaped sliding groove 203c formed at the bottom of the mounting block 203a, a limiting groove 203d formed at the end of the mounting block 203a, and a counterweight 203e disposed in the mounting groove 203b. The outer side of the support rod 201a is fixedly connected to the mounting block 203a. The top of the mounting block 203a is provided with the mounting groove 203b. The lower part of the mounting block 203a is provided with the L-shaped sliding groove 203c, and the vertical groove part of the L-shaped sliding groove 203c is opened into the mounting block 203a, and the horizontal groove part of the L-shaped sliding groove 203c is opened at the bottom of the mounting block 203a. A limiting groove 203d is formed at one end of the mounting block 203a away from the support rod 201a, and a counterweight 203e is arranged in the mounting groove 203b. Through the mounting groove 203b formed in the mounting block 203a, counterweights 203e of different weights can be placed inside it, so as to realize the quantitative control of the materials on the baffle 102c.

[0036] The remaining structures are the same as those in Embodiment 1.

[0037] During use, when a transmission mechanism and the endoscopic care disinfection device 2b rotate, they will drive the arc notch plate 202a, the arc inclined plate 202b, and the limiting block 202c to rotate around the shaft rod 102b. At this time, the inner walls of the arc notch plate 202a and the arc inclined plate 202b will abut against the limiting groove 201d of the output block 201c, causing the output block 201c and the output rod 201b to rotate around the support rod 201a. At the same time, the output block 201c will also drive the support rod 201a to rotate. During the rotation of the support rod 201a, it will drive the mounting block 203a and the counterweight 203e to an inclined state around the support rod 201a. At this point, the baffle 102c will be completely opened, and the materials in the feed pipe 101b will enter the 3D printer with a fixed weight. At this time, the weight borne by the baffle 102c is less than the weight of the counterweight 203e. The mounting block 203a and the counterweight 203e will drive the support rod 201a to rotate under their own weights. At this time, the output rod 201b and the output block 201c will follow the support rod 201a to rotate. During the rotation, they will abut against the inner walls of the arc inclined plate 202b and the arc notch plate 202a through the limiting groove 201d, causing them to drive the shaft rod 102b and the baffle 102c to rotate around the shaft rod 102b. When the baffle 102c abuts against the end of the feed pipe 101b, the mounting block 203a and the counterweight 203e will no longer rotate around the support rod 201a, thus achieving the purpose of quantitative feeding of the feed pipe 101b.

[0038] Embodiment 3, refer to Figures 1 to 5, which is the third embodiment of the utility model. Different from the previous embodiment, it also includes a mounting component 300; it includes a trigger component 301 arranged in the counterweight component 203, a fixing component 302 connected to the trigger component 301, and a plug-in component 303 arranged in the counterweight component 203. First, the counterweight block 203e is placed in the mounting block 203a, and the trigger component 301 will slide downward under the weight of the counterweight block 203e. At this time, the trigger component 301 will drive the fixing component 302 to move toward the counterweight block 203e and fix the counterweight block 203e. In the process of moving the fixing component 302, it will also resist the plug-in component 303. When the fixing component 302 completely fixes the counterweight block 203e, the plug-in component 303 will be inserted into the fixing component 302 and restrain the fixing component 302. At this time, the purpose of facilitating the replacement of the counterweight block 203e is achieved, which can further achieve the purpose of facilitating the quantitative measurement of the material being fed.

[0039] Specifically, the trigger assembly 301 includes a trigger rod 301a, an L-shaped connecting plate 301b arranged outside the trigger rod 301a, and a slot 301c opened on the L-shaped connecting plate 301b; wherein the trigger rod 301a is arranged in the mounting groove 203b, the fixing assembly 302 includes a receiving rod 302a arranged at the end of the L-shaped connecting plate 301b, and an arc-shaped fixing plate 302b arranged at the end of the receiving rod 302a, the mounting groove 203b of the mounting block 203a is slidably connected with the trigger rod 301a, the trigger rod 301a is composed of a vertical rod and an inclined rod, and the end of the trigger rod 301a is arranged in an arc shape, which can increase the contact area between the counterweight block 203e and the trigger rod 301a, and the trigger rod 301a is located on the outside of the inclined rod and is slidably connected to the L-shaped The connecting plate 301b is slidably connected in the L-shaped slide groove 203c, and the vertical rod part of the L-shaped connecting plate 301b is arranged in the vertical groove of the L-shaped slide groove 203c, and at the same time, a receiving rod 302a is fixedly connected to its side, and the end of the receiving rod 302a passes through the vertical groove of the L-shaped slide groove 203c and is fixedly connected to the arc-shaped fixed plate 302b. In addition, the cross bar part of the L-shaped connecting plate 301b is slidably connected in the cross groove of the L-shaped slide groove 203c, and the L-shaped slide groove 203c is provided with a movable groove Q1 at the position corresponding to the trigger rod 301a, so that the trigger rod 301a can slide in the mounting block 203a, and the end of the cross bar of the L-shaped connecting plate 301b is provided with an inclined surface, and the L-shaped connecting plate 301b is provided with a slot 301c above the cross bar;

[0040] When the counterweight block 203e is placed in the installation groove 203b, the counterweight block 203e can drive the trigger rod 301a to descend with its own weight. During the descent of the trigger rod 301a, its inclined rod part will slide inside the cross bar of the L-shaped connecting plate 301b. Since the inclined rod is arranged in an inclined shape and the L-shaped connecting plate 301b is slidably connected in the L-shaped sliding groove 203c, the L-shaped connecting plate 301b drives the receiving rod 302a and the arc-shaped fixing plate 302b to move toward the counterweight block 203e, and cooperates with the inner wall of the installation groove 203b to fix the counterweight block 203e, and then the L-shaped connecting plate 301b can be restricted by the plug-in assembly 303, thereby achieving the purpose of facilitating the replacement of different counterweight blocks 203e.

[0041] Furthermore, the plug-in assembly 303 includes a slider 303a, a plug rod 303b arranged at the end of the slider 303a, and a force storage spring 303c arranged between the slider 303a and the limiting groove 203d; wherein the slider 303a is arranged in the limiting groove 203d, the slider 303a is slidably connected inside the limiting groove 203d, and a force storage spring 303c is arranged between the slide groove and the limiting groove 203d, and the bottom end of the slider 303a located outside the limiting groove 203d is fixedly connected with the plug rod 303b, and the plug rod 303b matches the slot 301c. During the sliding process of the above-mentioned L-shaped connecting plate 301b, its end will resist the plug rod 303b, so that the plug rod 303b drives the slider 3 03a slides upward in the limiting groove 203d and squeezes the force storage spring 303c. When the slot 301c on the L-shaped connecting plate 301b moves to a position corresponding to the insertion rod 303b, the insertion rod 303b will not be subjected to the force of the L-shaped connecting plate 301b. At this time, the force storage spring 303c will push the slider 303a to reset, and the insertion rod 303b will be inserted into the slot 301c, thereby locking the L-shaped connecting plate 301b. When unlocking is required, the slider 303a is pushed upward to drive the insertion rod 303b to leave the slot 301c, thereby releasing the restriction on the L-shaped connecting plate 301b, thereby achieving the purpose of facilitating the replacement of counterweight blocks 203e of different weights.

[0042] In addition, a telescopic rod Q1 is fixedly connected to the outside of the conveying pipe 101b above the mounting block 203a, and a sensor Q2 is provided at the end of the telescopic rod Q1. At the same time, the sensor Q2 is connected to the signal of the 3D printer. At this time, the sensor Q2 is controlled by the printing time of the 3D printer, and a telescopic command is issued to the telescopic rod Q1 to limit the mounting block 203a. In this way, the quantitative unloading of different objects can be achieved, and the purpose of unloading can be adapted to the printing time of different objects.

[0043] The rest of the structure is the same as that of Example 2.

[0044] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described in this application (for example, the dimensions, scales, structures, shapes and proportions of various elements, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature, number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structures that perform the recited function described herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present utility model. Therefore, the present utility model is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0045] In addition, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described (i.e., those features that are not relevant to the currently considered best mode of implementing the present utility model, or those features that are not relevant to the implementation of the present utility model).

[0046] It should be understood that in the development of any actual implementation, as in any engineering or design project, a large number of specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without excessive experimentation, such development efforts will be a routine task of design, manufacturing and production.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. A quantitative powder feeding mechanism, characterized in that: including, a main body component (100), including a body assembly (101) and a shielding component (102) provided under the body assembly (101); a control component (200), including an output component (201) provided outside the body assembly (101), a guiding component (202) provided inside the output component (201), and a counterweight component (203) provided outside the output component (201).

2. The quantitative powder feeding mechanism according to claim 1, characterized in that: The body assembly (101) includes a powder feeding box (101a) and a material conveying pipe (101b) provided at an end of the powder feeding box (101a).

3. The quantitative powder feeding mechanism according to claim 2, characterized in that: The shielding component (102) includes a support (102a) provided outside the material conveying pipe (101b), a shaft rod (102b) provided outside the support (102a), and a baffle (102c) provided outside the shaft rod (102b).

4. The powder feeding mechanism for quantitative feeding according to claim 3, wherein: The output component (201) includes a support rod (201a) provided outside the material conveying pipe (101b), an output rod (201b) provided outside the support rod (201a), an output block (201c) provided at an end of the output rod (201b), and a limiting groove (201d) opened outside the output block (201c).

5. The powder feeding mechanism for quantitative feeding according to claim 4, characterized in that: The guiding component (202) includes an arc-shaped notch plate (202a) provided at an end of the shaft rod (102b), an arc-shaped inclined plate (202b) provided at an end of the arc-shaped notch plate (202a), and limiting blocks (202c) respectively provided at ends of the arc-shaped notch plate (202a) and the arc-shaped inclined plate (202b); wherein, the arc-shaped notch plate (202a), the arc-shaped inclined plate (202b) are adapted to the limiting groove (201d).

6. The powder feeding mechanism for quantitative feeding according to claim 5, wherein: The counterweight component (203) includes a mounting block (203a) provided outside the support rod (201a), a mounting groove (203b) opened on the mounting block (203a), an L-shaped sliding groove (203c) opened at the bottom of the mounting block (203a), a limiting groove (203d) opened at an end of the mounting block (203a), and a counterweight block (203e) provided in the mounting groove (203b).

7. The powder feeding mechanism for quantitative feeding according to claim 5 or 6, characterized in that: It further includes a mounting component (300); which includes a triggering component (301) provided in the counterweight component (203), a fixing component (302) connected to the triggering component (301), and a plugging component (303) provided in the counterweight component (203).

8. The powder feeding mechanism for quantitative feeding according to claim 7, characterized in that: The triggering component (301) includes a triggering rod (301a), an L-shaped connecting plate (301b) provided outside the triggering rod (301a), and a slot (301c) opened on the L-shaped connecting plate (301b); wherein, the triggering rod (301a) is provided in the mounting groove (203b).

9. The powder feeding mechanism for quantitative feeding according to claim 8, characterized in that: The fixing component (302) includes a receiving rod (302a) provided at an end of the L-shaped connecting plate (301b), and an arc-shaped fixing plate (302b) provided at an end of the receiving rod (302a).

10. The powder feeding mechanism for quantitative feeding according to claim 9, characterized in that: The plug-in assembly (303) comprises a slider (303a), an insertion rod (303b) arranged at the end of the slider (303a), and a force storage spring (303c) arranged between the slider (303a) and the limiting groove (203d); Wherein, the sliding block (303a) is arranged in the limiting groove (203d).

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