Ash removal device of ash conveying pipeline

Abstract

The utility model relates to an ash removal device of an ash conveying pipeline, comprising: an airflow generation device having a first air outlet used for connecting one end of the ash conveying pipeline; the ash collecting box is provided with an air inlet and a second air outlet, and the air inlet is used for being connected with the other end of the ash conveying pipeline; the filter screen is arranged at the second air outlet; the screening pipe is of a cylindrical structure with one end open, a plurality of ash passing holes are formed in the pipe wall and the pipe bottom of the screening pipe, and the open end of the screening pipe is connected to the air inlet. One end of the ash conveying pipeline is communicated with the first air outlet, the other end of the ash conveying pipeline is communicated with the air inlet, the airflow generating equipment is started, ash in the ash conveying pipeline is blown to be straight through airflow, the ash with large particles is filtered through the screening pipe, and the ash with small particles is allowed to fall into the ash collecting box along with the airflow through the screening pipe. And the airflow blown into the ash residue collecting box can flow out through a second air outlet, so that the recycled ash residues can be reasonably utilized.

Description

Technical Field

[0001] The present disclosure relates to the technical field of ash removal for thermal power plant pipelines, and in particular to an ash removal device for an ash conveying pipeline. Background Art

[0002] Thermal power plants usually use pneumatic pipeline conveying technology for ash transportation and recycling, which can efficiently handle large amounts of dust and waste. Pneumatic conveying uses airflow to transport dust from the boiler or burner system of the thermal power plant to the dust collector or ash collector, without the need for mechanical handling, which can reduce energy consumption and labor costs. However, ash will accumulate on the inner wall of the ash conveying pipeline for various reasons, and the accumulated ash needs to be cleaned regularly. The commonly used cleaning method is to connect one end of the pipeline to a high-pressure air pump and blow out the ash with high-pressure gas. However, this method cannot screen the ash during cleaning, resulting in ash particles of different sizes, which affects the recycling of ash. In view of this, we propose a new cleaning device for ash removal pipelines in thermal power plants. Utility Model Content

[0003] The purpose of the present disclosure is to provide an ash removal device for an ash conveying pipeline to at least partially solve the problems existing in the related art.

[0004] In order to achieve the above-mentioned purpose, the present disclosure provides an ash removal device for an ash conveying pipeline, comprising: an air flow generating device, having a first air outlet, the first air outlet being used to connect one end of the ash conveying pipeline; an ash collection box, having an air inlet and a second air outlet, the air inlet being used to connect the other end of the ash conveying pipeline; a filter screen, arranged at the second air outlet; and a screen pipe, constructed as a cylindrical structure with one end open, and the pipe wall and the bottom of the screen pipe are both provided with a plurality of ash passing holes, and the open end of the screen pipe is connected to the air inlet.

[0005] Optionally, it also includes a fixed pipe installed on the air inlet, the first end of the fixed pipe extends to the outside of the ash collection box, the second end extends to the inside of the ash collection box, and the open end of the screen pipe is connected to the second end of the fixed pipe.

[0006] Optionally, the system further comprises a driving mechanism for driving the screen pipe to reciprocate along the axial direction of the fixed pipe relative to the fixed pipe.

[0007] Optionally, it also includes an air outlet pipe installed at the second air outlet, the filter screen is installed on a side of the air outlet pipe away from the ash collection box, and the driving mechanism includes: a fan blade group installed in the air outlet pipe; a rotating shaft, one end of which is connected to the fan blade group, and the other end extends to the outside of the pipe wall of the screen pipe; a top block, one end of which is installed at one end of the rotating shaft close to the screen pipe, and the other end extends in a direction perpendicular to the axial direction of the rotating shaft; and a contact block, which is installed at a position corresponding to the top block on the outside of the pipe wall of the screen pipe, so that the contact block can be driven to move upward along the axial direction of the screen pipe when the top block rotates and moves upward following the rotating shaft.

[0008] Optionally, the lower end surface of the fixed tube is concave to form an annular groove, and the upper end surface of the screen tube is formed with an annular strip that cooperates with the annular groove, wherein the groove wall of the annular groove is concave to form a clamping groove, and the side wall of the annular strip is formed with a clamping block that cooperates with the clamping groove, and the clamping block is confined in the clamping groove and can move in the axial direction of the screen tube in the clamping groove.

[0009] Optionally, a plurality of mutually spaced positioning posts are provided at the bottom of the annular groove, and a plurality of post holes for cooperating with the positioning posts are provided on the annular strip.

[0010] Optionally, it also includes: a telescopic rod, which is arranged in the fixed tube; a movable frame, which is installed in the fixed tube and connected to the telescopic rod; and a pressure plate, which is installed on the movable frame and can rotate relative to the movable frame, wherein, when the pressure plate is rotated until the plate surface is parallel to the bottom of the screen tube, the telescopic rod can drive the movable frame to drive the pressure plate to move along the axial direction of the fixed tube to crush the ash; when the pressure plate is rotated until the plate surface and the bottom of the screen tube form an angle with each other, the ash is allowed to move from the fixed tube to the screen tube.

[0011] Optionally, the movable frame includes a circular plate that matches the shape of the inner wall of the fixed tube, the pressure plate is circular and is installed on the inner side of the circular plate in a shape-matching manner, and a drive motor is provided on the circular plate to drive the pressure plate to rotate relative to the circular plate.

[0012] Optionally, it further includes a first corrugated pipe connected to the first end of the fixed pipe, and a second corrugated pipe connected to the first air outlet.

[0013] Optionally, a mobile platform with wheels is further included, and the airflow generating device and the ash collection box are respectively installed on the upper surface of the mobile platform.

[0014] Through the above technical solution, when it is necessary to clean the ash conveying pipeline, one end of the ash conveying pipeline can be connected to the first air outlet and the other end can be connected to the air inlet, and the airflow generating device can be started. The ash in the ash conveying pipeline can be blown straight to the screening tube through the airflow, and the ash with larger particles can be filtered through the screening tube, and the ash with smaller particles can be allowed to fall into the ash collection box through the screening tube and follow the airflow. The airflow blown into the ash collection box can flow out through the second air outlet, and the filter can retain the ash in the ash collection box. The screening tube can screen the ash according to the particle size to facilitate the rational use of the recovered ash.

[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0017] Figure 1 is a schematic diagram of an ash removal device for an ash conveying pipeline according to an exemplary embodiment of the present disclosure;

[0018] Figure 2 yes Figure 1 An internal cross-sectional view of an ash collection box of an ash removal device of an ash conveying pipeline shown in FIG;

[0019] Figure 3 yes Figure 1 An internal cross-sectional view of an ash collection box of an ash removal device of an ash conveying pipeline shown in FIG, wherein the fixed pipe and the screening pipe are omitted;

[0020] Figure 4 yes Figure 1 A cross-sectional view of the fixed pipe and the screening pipe of the ash removal device of the ash conveying pipeline shown in FIG;

[0021] Figure 5 yes Figure 1 A cross-sectional view of a fixed pipe of an ash removal device of an ash conveying pipeline shown in FIG;

[0022] Figure 6 yes Figure 1 A cross-sectional view of a screening pipe of an ash removal device of an ash conveying pipeline shown in FIG;

[0023] Figure 7 yes Figure 1 A partial enlarged view of the ash removal device of the ash conveying pipeline near the motor position is shown in FIG;

[0024] Figure 8 yes Figure 1A partial enlarged view of the screen pipe of the ash removal device of the ash conveying pipeline near the annular strip;

[0025] Figure 9 yes Figure 1 A partial enlarged view of the ash removal device of the ash conveying pipeline near the top block and contact block is shown in FIG.

[0026] Description of Reference Numerals

[0027] 1-airflow generating device; 101-first air outlet; 2-ash collection box; 201-air inlet; 202-second air outlet; 3-filter screen; 4-screening tube; 401-tube wall; 402-tube bottom; 41-annular strip; 42-block; 43-column hole; 5-fixed tube; 51-annular groove; 52-slot; 53-positioning column; 6-air outlet pipe; 71-fan blade group; 72-rotating shaft; 73-top block; 74-contact block; 81-telescopic rod; 82-movable frame; 821-circular plate; 83-pressing plate; 84-driving motor; 901-first bellows; 902-second bellows; 1000-movable platform. DETAILED DESCRIPTION

[0028] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0029] In the present disclosure, unless otherwise stated, the directional words used, such as "up", "down", "inside", and "outside", may be defined based on the actual use direction of the relevant components, or may be defined based on the structure of the relevant components themselves, for example: the first end of the fixed pipe extends to the "outside" side of the ash collection box, and the second end extends to the "inside" side of the ash collection box, where the "outside" side refers to the outside of the accommodating space of the ash collection box, and the "inside" side refers to the inside of the accommodating space of the ash collection box; when the top block follows the rotation of the rotating shaft to move "upward", the contact block can be driven to move "upward" along the axial direction of the screening tube, where "upward" refers to the direction in which the ash removal device is away from the ground when in use, and specifically can be perpendicular to the direction of the ground, or the angle between the ash removal device and the ground can be an acute angle, which can be defined according to the actual use environment.

[0030] In addition, in this disclosure, the terms "first", "second", etc. are used to distinguish one element from another and do not have order or importance. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0031] Reference Figures 1-9The present disclosure exemplifies an ash removal device for an ash conveying pipeline, comprising an airflow generating device 1 having a first air outlet 101, an ash collection box 2 having an air inlet 201 and a second air outlet 202, a filter screen 3 arranged at the second air outlet 202, and a screen pipe 4 constructed as a cylindrical structure with one end open. The first air outlet 101 is used to connect one end of the ash conveying pipeline, and the air inlet 201 is used to connect the other end of the ash conveying pipeline. The pipe wall 401 and the pipe bottom 402 of the screen pipe 4 are both provided with a plurality of ash holes, and the open end of the screen pipe 4 is connected to the air inlet 201. The "pipe bottom 402" refers to the position opposite to the open end, and the "pipe wall 401" refers to the position between the pipe bottom 402 and the open end. The number and aperture of the "ash holes" can be adaptively designed according to actual needs, and the present disclosure does not impose any restrictions on this.

[0032] In the embodiment of the present disclosure, the airflow generating device 1 may be a high-pressure air pump, a high-pressure fan, etc., as long as it can provide the ash conveying pipeline with a clean airflow for cleaning the ash conveying pipeline.

[0033] In the embodiments of the present disclosure, the open end of the screen tube 4 can be directly connected to the air inlet 201, or in some other embodiments, the open end of the screen tube 4 can also be indirectly connected to the air inlet 201 through the fixed tube 5 mentioned below. The screen tube 4 can be formed by two metal screens, one of which is wound to form the tube wall 401, and the other is welded to one end of the tube wall 401 to form the tube bottom 402, that is, the screen tube 4 is a metal cylindrical structure with one end open, and the mesh of the screen can be used for the aforementioned ash hole. In addition, in some other embodiments, the screen tube 4 can also be made of plastic, rubber, etc. In this case, it is necessary to provide a plurality of through holes for ash and airflow to pass through the tube wall 401 and the tube bottom 402, respectively, and the through holes can be used for the aforementioned ash hole.

[0034] In order to avoid ash clogging the air inlet 201 and the second air outlet 202, in the embodiment of the present disclosure, the air inlet 201 and the second air outlet 202 can be set at a higher position of the ash collection box 2, and the ash can fall to the bottom of the ash collection box 2 due to gravity. Even if it is blown up by the air flow, it will not cause the problem of clogging the air inlet 201 and the second air outlet 202.

[0035] By using the above technical solution, when it is necessary to clean the ash conveying pipeline, one end of the ash conveying pipeline can be connected to the first air outlet 101 and the other end can be connected to the air inlet 201, and the airflow generating device 1 is started. The ash in the ash conveying pipeline is blown to the screening tube 4 by the airflow, and the ash with larger particles is filtered through the screening tube 4, and the ash with smaller particles is allowed to fall into the ash collection box 2 through the screening tube 4 following the airflow, and the airflow blown into the ash collection box 2 can flow out through the second air outlet 202, and the filter 3 can retain the ash in the ash collection box 2, and the screening tube 4 can screen the ash according to the particle size, so as to facilitate the rational use of the recovered ash.

[0036] Reference Figure 1 and Figure 2 In an embodiment of the present disclosure, the ash removal device for the ash conveying pipeline may further include a fixed pipe 5 mounted at the air inlet 201. The first end of the fixed pipe 5 extends to the outside of the ash collection box 2, and the second end extends to the inside of the ash collection box 2. The open end of the sieve pipe 4 is connected to the second end of the fixed pipe 5. The provision of the fixed pipe 5 facilitates the connection between the ash conveying pipeline and the sieve pipe 4 and the air inlet 201, thereby reducing assembly difficulty and improving connection stability.

[0037] In an embodiment of the present disclosure, the ash removal device of the ash conveying pipeline may further include a driving mechanism for driving the screen pipe 4 to reciprocate along the axial direction of the fixed pipe 5 relative to the fixed pipe 5. By driving the screen pipe 4 to reciprocate along the axial direction by the driving mechanism, the screen pipe 4 is vibrated, thereby improving its filtering and screening effect.

[0038] The present disclosure does not limit the specific structure of the driving mechanism. Figure 3-Figure 4 、 Figure 6 as well as Figure 9In the illustrated embodiment, the ash removal device of the ash conveying pipeline may further include an air outlet pipe 6 mounted at the second air outlet 202, and the filter screen 3 may be mounted on a side of the air outlet pipe 6 away from the ash collection box 2. In order to prevent ash from clogging the air outlet pipe 6 or the filter screen 3, in the embodiment of the present disclosure, the air outlet pipe 6 may extend upwardly and obliquely in a direction away from the ash collection box 2 so that the ash can fall into the ash collection box 2 under the action of gravity. The driving mechanism may include a fan blade assembly 71 mounted in the air outlet pipe 6, a rotating shaft 72 having one end connected to the fan blade assembly 71 and the other end extending to the outside of the pipe wall 401 of the screen pipe 4, a top block 73 having one end mounted on the end of the rotating shaft 72 near the screen pipe 4 and the other end extending in a direction perpendicular to the axial direction of the rotating shaft 72, and a contact block 74 mounted on the outside of the pipe wall 401 of the screen pipe 4 at a position corresponding to the top block 73, so that when the top block 73 rotates and moves upward with the rotating shaft 72, the contact block 74 can be driven to move upward along the axial direction of the screen pipe 4. Specifically, when the ash removal device is working, the air flow blown into the ash collection box 2 drives the fan blade group 71 to rotate when passing through the air outlet pipe 6, and then drives the rotation shaft 72 to rotate, and then drives the top block 73 to rotate through the rotation shaft 72. Since the top block 73 corresponds to the position of the contact block 74, the end of the top block 73 away from the rotation shaft 72 moves from bottom to top, which pushes the contact block 74 to move upward, that is, pushes the screen tube 4 to move upward, and when the top block 73 is separated from the contact block 74, the screen tube 4 moves downward under the action of gravity, thereby forming an up and down shaking of the screen tube 4. In addition, in some other embodiments, a crank slider mechanism, a screw nut mechanism, a telescopic cylinder mechanism, etc. can also be added to the ash collection box 2 to achieve the reciprocating shaking of the screen tube 4.

[0039] Reference Figure 5-Figure 8 In an embodiment of the present disclosure, the lower end surface of the fixed tube 5 can be concave to form an annular groove 51, and the upper end surface of the screen tube 4 can be formed with an annular strip 41 that cooperates with the annular groove 51. The groove wall of the annular groove 51 can be concave to form a clamping groove 52, and the side wall of the annular strip 41 can be formed with a clamping block 42 that cooperates with the clamping groove 52. The clamping block 42 can be constrained in the clamping groove 52 and can move axially along the sieve tube 4 in the clamping groove 52. The cooperation between the clamping groove 52 and the clamping block 42 can achieve axial reciprocating movement of the sieve tube 4 relative to the fixed tube 5 without separating from each other. With this design, during installation, the annular groove 51 or the annular strip 41 can be deformed by applying an external force, so that the annular strip 41 can extend into the annular groove 51 and ensure that the clamping block 42 extends into the clamping groove 52. In this case, at least one of the annular groove 51 and the annular strip 41 needs to be elastic.

[0040] It should be noted that the locking groove 52 may be formed on only one inner wall of the annular groove 51 . Alternatively, in other embodiments, the locking groove 52 may also be formed on both inner walls of the annular groove 51 .

[0041] Furthermore, in order to prevent the screen tube 4 from rotating relative to the fixed tube 5, refer to Figure 7 and Figure 8 In the disclosed embodiment, the bottom of the annular groove 51 may be provided with a plurality of mutually spaced positioning posts 53, and the annular strip 41 may be provided with a plurality of post holes 43 for engaging with the positioning posts 53. During installation, the circumferential rotation limit can be achieved by simply inserting the positioning posts 53 into the corresponding post holes 43, which is convenient and quick to operate.

[0042] Reference Figure 4-Figure 5 In an embodiment of the present disclosure, the ash removal device of the ash conveying pipeline may further include a telescopic rod 81 disposed in the fixed pipe 5, a movable frame 82 installed in the fixed pipe 5 and connected to the telescopic rod 81, and a pressure plate 83 installed on the movable frame 82 and rotatable relative to the movable frame 82. When the pressure plate 83 rotates until the plate surface is parallel to the bottom 402 of the screening pipe 4, the telescopic rod 81 can drive the movable frame 82 to drive the pressure plate 83 to move along the axial direction of the fixed pipe 5 to crush the ash; when the pressure plate 83 rotates until the plate surface and the bottom 402 of the screening pipe 4 form an angle with each other, the ash is allowed to move from the fixed pipe 5 to the screening pipe 4. With this design, the pressure plate 83 can be controlled to rotate until it is parallel to the bottom 402 and driven downward by the telescopic rod 81 to crush the larger ash particles at the bottom 402 of the screening pipe 4, so that it can move through the through hole of the screening pipe 4 to the ash collection box 2 for recovery.

[0043] In the embodiment of the present disclosure, the telescopic rod 81 may include a cylinder, or a screw mechanism to achieve the telescopic function, and the present disclosure does not limit this.

[0044] Reference Figure 4 and Figure 5 In an embodiment of the present disclosure, the movable frame 82 may include a circular plate 821 that matches the shape of the inner wall of the fixed tube 5. The pressure plate 83 may be constructed in a circular shape and mounted on the inner side of the circular plate 821 in a matching shape. The circular plate 821 may be provided with a drive motor 84 for driving the pressure plate 83 to rotate relative to the circular plate 821. By providing the circular plate 821 and the pressure plate 83, when the pressure plate 83 rotates to be parallel to the tube bottom 402, the circular plate 821 and the pressure plate 83 can jointly form a rolling surface that matches the size of the tube bottom 402, thereby ensuring that all large particles of ash at the tube bottom 402 are rolled. The provision of the circular plate 821 can also provide a mounting position for the drive motor 84. The pressure plate 83 can be rotatably connected to the circular plate 821 via two shafts, and the output shaft of the drive motor 84 can be connected to one of the shafts to drive the rotation of the pressure plate 83.

[0045] Reference Figure 1In an embodiment of the present disclosure, the ash removal device for the ash conveying pipeline may further include a first bellows 901 connected to the first end of the fixed pipe 5, and a second bellows 902 connected to the first air outlet 101. The provision of the first bellows 901 and the second bellows 902 facilitates connection to the ash conveying pipeline due to the flexible nature of the bellows.

[0046] Reference Figure 1 In an embodiment of the present disclosure, the ash removal device of the ash conveying pipeline may further include a mobile platform 1000 with wheels, and the airflow generating device 1 and the ash collection box 2 may be respectively mounted on the upper surface of the mobile platform 1000. The provision of the mobile platform 1000 facilitates the transfer of the ash removal device, saves manpower, and improves work efficiency.

[0047] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0048] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0049] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A dust removal device for an ash conveying pipeline, characterized in that: include: An airflow generating device having a first air outlet, wherein the first air outlet is used to connect to one end of the ash conveying pipeline; An ash collection box having an air inlet and a second air outlet, wherein the air inlet is used to connect to the other end of the ash conveying pipeline; a filter, arranged at the second air outlet; as well as The screening tube is constructed as a cylindrical structure with one end open, and a plurality of ash holes are provided on the tube wall and the tube bottom of the screening tube. The open end of the screening tube is connected to the air inlet.

2. The ash removal device for the ash conveying pipeline according to claim 1, characterized in that: It also includes a fixed pipe installed on the air inlet, the first end of the fixed pipe extends to the outside of the ash collection box, the second end extends to the inside of the ash collection box, and the open end of the screen pipe is connected to the second end of the fixed pipe.

3. The ash removal device for the ash conveying pipeline according to claim 2, characterized in that: The device further comprises a driving mechanism for driving the screen pipe to reciprocate along the axial direction of the fixed pipe compared to the fixed pipe.

4. The ash removal device for the ash conveying pipeline according to claim 3, characterized in that: The system further includes an air outlet pipe installed at the second air outlet, the filter screen is installed at a side of the air outlet pipe away from the ash collection box, and the driving mechanism includes: A fan blade assembly is installed in the air outlet pipe; A rotating shaft, one end of which is connected to the fan blade assembly and the other end of which extends to the outside of the tube wall of the sieve tube; a top block, one end of which is mounted on an end of the rotating shaft close to the screen tube, and the other end of which extends in a direction perpendicular to the axial direction of the rotating shaft; and The contact block is installed on the outer side of the pipe wall of the screen pipe at a position corresponding to the top block, so as to drive the contact block to move upward along the axial direction of the screen pipe when the top block moves upward following the rotation shaft.

5. The ash removal device for the ash conveying pipeline according to claim 3 or 4, characterized in that: The lower end surface of the fixed tube is concave to form an annular groove, and the upper end surface of the screening tube is formed into an annular strip that matches the annular groove. The groove wall of the annular groove is concavely formed with a clamping groove, and the side wall of the annular strip is formed with a clamping block that cooperates with the clamping groove. The clamping block is confined in the clamping groove and can move axially along the sieve pipe in the clamping groove.

6. The ash removal device for the ash conveying pipeline according to claim 5, characterized in that: The bottom of the annular groove is provided with a plurality of mutually spaced positioning posts, and the annular strip is provided with a plurality of post holes for cooperating with the positioning posts.

7. The ash removal device for the ash conveying pipeline according to claim 2, characterized in that: Also includes: a telescopic rod, disposed in the fixed tube; a mobile frame, installed in the fixed tube and connected to the telescopic rod; as well as A pressure plate is mounted on the movable frame and is rotatable relative to the movable frame. Among them, when the pressure plate rotates until the plate surface is parallel to the bottom of the screen tube, the telescopic rod can drive the movable frame to drive the pressure plate to move along the axial direction of the fixed tube to crush the ash; when the pressure plate rotates until the plate surface and the bottom of the screen tube form an angle with each other, the ash is allowed to move from the fixed tube to the screen tube.

8. The ash removal device for the ash conveying pipeline according to claim 7, characterized in that: The movable frame includes a circular plate that matches the inner wall shape of the fixed tube. The pressure plate is circular and is mounted on the inner side of the circular plate in a shape-matched manner. A driving motor is provided on the circular plate to drive the pressure plate to rotate relative to the circular plate.

9. The ash removal device for the ash conveying pipeline according to claim 2, characterized in that: It also includes a first corrugated pipe connected to the first end of the fixed pipe, and a second corrugated pipe connected to the first air outlet.

10. The ash removal device for the ash conveying pipeline according to claim 1, characterized in that: It also includes a mobile platform with wheels, and the airflow generating device and the ash collection box are respectively installed on the upper surface of the mobile platform.

Images