Air cooler for preparing hairy crab feed

Abstract

The invention belongs to the technical field of equipment for feed production, and particularly relates to an air cooler for preparing hairy crab feed. The air cooler structurally comprises an exhaust fan, an air pipe and a powder intercepting pore plate, and further comprises an air inlet cover body unit which is provided with the exhaust fan on the outer surface and is used for being inserted into a feeding conveying belt, and an air inlet belt net frame body unit which is arranged on the lower end face of the air inlet cover body unit, is provided with the air pipe and is used for intercepting agglomerated particles, the air inlet bottom shell unit is arranged on the lower end face of the air inlet belt net frame body unit and used for being inserted into a discharging conveying belt, and the recovery opening is formed in the air inlet cover body unit and used for falling and collecting powder on a feeding conveying belt. And the interception box body unit is arranged on the upper surface of the air inlet cover body unit, is internally provided with the powder interception pore plate and is used for sealing and covering the recovery opening.

Description

Technical Field

[0001] The present application belongs to the technical field of equipment for feed production, and in particular, relates to a cold air blower for preparing hairy crab feed. Background Art

[0002] The raw materials of hairy crab feed mainly include fish meal, soybean meal, shrimp meal, fish oil, corn meal, wheat flour, shell meal, etc. Hairy crab feed is in granular form, and its preparation method mainly includes the following steps in sequence: batching, mixing, extrusion molding, cooling, screening, oil spraying, and packaging. The above cooling step requires the use of a cold air blower.

[0003] On the other hand, the qualified length of hairy crab feed particles is generally 4-12 mm. The above cooling step generally detects the agglomerated particles, and the above screening step generally screens out the feed powder. Both the agglomerated particles and the feed powder need to be recycled.

[0004] Generally, the common air coolers used in feed production mainly include a housing, an air duct, a fan, and a powder interception plate. The principle of the above-mentioned existing air coolers is mainly: the housing is provided with an air inlet, a feed inlet, and a feed outlet, and the room temperature air passes through the air inlet, the housing, the air duct, and the powder interception plate in sequence, so as to achieve the basic high-temperature feed cooling and feed powder recovery effect.

[0005] For example, the Chinese utility model patent with application announcement number CN205183156U and authorization announcement date 2016.04.27 discloses a cold air grading machine for hairy crab feed, whose structure includes a feeding mechanism, a cooling box, a grid plate, an air suction duct, an air window, a dust collecting box, an elevator, a powder screening mechanism, an output duct, a cold air blower, and a vibrating screen.

[0006] The cold air grading machine in this utility model patent has the following advantages: it adds the process of secondary cold air freeze-drying and particle size grading and screening, which not only improves the efficiency of powder removal, but also makes the finished feed produced later have obvious quality grading.

[0007] However, in actual use, the cold air classification machine still has at least the following inefficiencies and impracticalities, specifically: First, the air window is both the discharge position and the air intake position, so the discharge operation will interfere with and reduce the air intake cooling effect, making the cooling intensity have a lower upper limit; Second, when the feed powder collected by the dust box structure is recycled, the entire dust box needs to be disassembled, which is relatively inefficient and troublesome. Summary of the invention

[0008] The present application provides an air cooler for preparing hairy crab feed, and the technical problem to be solved is: how to make the air cooler for feed preparation have the characteristics of relatively simple and efficient air cooling operation and feed powder recovery operation.

[0009] The technical solution adopted by the present application to solve the above-mentioned problems is: a cold air fan for preparing hairy crab feed, the structure of which includes an exhaust fan, an air duct, and a powder intercepting orifice plate, and also includes an air inlet cover unit with the exhaust fan on the outer surface and used to insert into the feeding conveyor belt, an air inlet belt net frame unit arranged on the lower end surface of the air inlet cover unit, provided with the air duct and used to intercept agglomerated particles, an air inlet bottom shell unit arranged on the lower end surface of the air inlet belt net frame unit and used to insert into the discharging conveyor belt, a recovery port arranged on the air inlet cover unit and used to collect powder dropped on the feeding conveyor belt, and an intercepting box unit arranged on the upper surface of the air inlet cover unit, provided with the powder intercepting orifice plate inside and used to cover the recovery port.

[0010] A further preferred technical solution is that it also includes a crash-dropping frame unit which is arranged on the inner side surface of the air inlet belt mesh frame unit and is used to seal the recovery port when the exhaust fan is turned on.

[0011] A further preferred technical solution is that the air inlet cover unit includes an upper rectangular frame, a conveyor belt mounting port and an upper air inlet arranged on the upper rectangular frame, and a top plate arranged on the upper rectangular frame and provided with the recovery port.

[0012] A further preferred technical solution is that the air inlet mesh frame unit includes a middle rectangular frame arranged on the lower end surface of the upper rectangular frame and provided with the air duct, an open plate arranged on the inner side surface of the middle rectangular frame and used to intercept agglomerated particles, and a middle air inlet arranged on the middle rectangular frame.

[0013] A further preferred technical solution is that the air inlet bottom shell unit includes a lower rectangular frame body arranged on the lower end surface of the middle rectangular frame, a conveyor belt lower mounting port and a lower air inlet port arranged on the lower rectangular frame body, and a bottom plate arranged on the lower rectangular frame body.

[0014] A further preferred technical solution is that the interception box unit includes a lower opening box provided on the upper surface of the top plate and used to cover the recovery port, and two pipe openings provided on the lower opening box and used to install the air duct.

[0015] A further preferred technical solution is that the frame unit for impacting and dropping materials includes a vertical plate which is arranged on the inner side surface of the air inlet belt mesh frame unit and is pulled out laterally by the air inlet belt mesh frame unit to impact the air inlet cover unit, a cover plate which is arranged on the vertical plate and is used to seal the recovery port, and a horizontal protruding plate which is arranged on the vertical plate and connected to the inner side surface of the air inlet belt mesh frame unit and is used to provide a horizontal distance for the impact action of the vertical plate.

[0016] A further preferred technical solution is that: a vertical support plate for laterally blocking the middle rectangular frame is provided on the outer side surface of the upper rectangular frame and the outer side surface of the lower rectangular frame.

[0017] A further preferred technical solution is that the vertical support plates are provided on two adjacent outer sides of the middle rectangular frame, and a sliding handle for recovering powder and a sliding handle for recovering agglomerated particles are respectively provided on the other two adjacent outer sides of the middle rectangular frame.

[0018] A further preferred technical solution is that the air inlet cover unit also includes a reinforcing mounting beam arranged on the upper rectangular frame.

[0019] The beneficial effects of this application include at least the following five points.

[0020] First, in this air cooler, the feed inlet and outlet paths are relatively independent from the cold air path, and the feed inlet and outlet movement will not reduce the air intake volume, so it has a more efficient and practical high-position feed air cooling effect.

[0021] Second, in the air cooler, the powder obtained on the powder interception orifice plate can fall back onto the feed conveyor belt at the recovery port, making the powder recovery operation simple enough without disassembling the interception box unit.

[0022] Thirdly, the impact falling frame unit can also provide a simple and practical impact effect for the above powder recovery operation, making the powder falling action more thorough and faster.

[0023] Fourth, the air inlet belt mesh frame unit has two different pull-out directions, one for recovering powder and the other for recovering agglomerated particles, ensuring that the recovery operation is comprehensive and convenient enough.

[0024] Fifth, the air cooler has high structural stability and comprehensive air cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of this application.

[0026] Figure 2 This is a schematic diagram of how to use this application.

[0027] Figure 3 The present invention is a structural schematic diagram of a feed conveyor belt and a discharge conveyor belt in the prior art.

[0028] Figure 4 This is a schematic diagram of the position structure of the air inlet bottom shell unit in this application.

[0029] Figure 5 This is a schematic diagram of the position structure of the air inlet belt mesh frame unit in this application.

[0030] Figure 6 This is a schematic diagram of the position structure of the air inlet cover unit in this application.

[0031] Figure 7 This is a schematic diagram of the position and shape of the recovery port in this application from a top view.

[0032] Figure 8 This is a schematic diagram of the position structure of the interception box unit in this application.

[0033] Fig. 9 Schematic diagram of the position and shape of the cover plate in this application.

[0034] Fig.10 This is a schematic diagram of the position structure of the frame unit used for impact dropping in this application.

[0035] Fig.11 This is a schematic diagram of the pulling direction of the air inlet belt mesh frame unit used for powder recovery in this application from a top view.

[0036] In the figure, the meanings of the symbols are as follows.

[0037] Feed conveyor belt a, agglomerated particles b, discharge conveyor belt c, powder d, high-temperature feed e, low-temperature feed f, lateral distance of impact action g, pull-out direction of air inlet belt net frame unit for powder recovery h, pull-out direction of air inlet belt net frame unit for agglomerated particles recovery k; Exhaust fan 11, air duct 12, powder interception orifice plate 13; Air inlet cover unit 1, air inlet belt frame unit 2, air inlet bottom shell unit 3, recovery port 4, interception box unit 5, impact falling frame unit 6, powder recovery sliding handle 7, agglomerated particle recovery sliding handle 8, vertical support plate 9; Upper rectangular frame 101, conveyor belt upper mounting opening 102, upper air inlet 103, top plate 104, reinforced mounting beam 105; The middle rectangular frame 201, the perforated plate 202, and the middle air inlet 203; The lower rectangular frame 301, the lower installation opening 302 of the conveyor belt, the lower air inlet 303, and the bottom plate 304; The lower opening box 501 and the pipe opening 502; Vertical plate 601 , cover plate 602 , and transverse protruding plate 603 . DETAILED DESCRIPTION

[0038] The following description is merely a preferred embodiment of the present application and does not limit the scope of the present application.

[0039] like Figure 1-Figure 11 As shown, a cold air blower for preparing hairy crab feed comprises an exhaust fan 11, an air duct 12, and a powder intercepting orifice plate 13, and also comprises an air inlet cover unit 1 having the exhaust fan 11 on its outer surface and used for inserting a feeding conveyor belt a, an air inlet belt net frame unit 2 arranged on the lower end surface of the air inlet cover unit 1 and provided with the air duct 12 and used for intercepting agglomerated particles b, an air inlet bottom shell unit 3 arranged on the lower end surface of the air inlet belt net frame unit 2 and used for inserting a discharging conveyor belt c, a recovery port 4 arranged on the air inlet cover unit 1 and used for collecting powder d dropped on the feeding conveyor belt a, and an intercepting box unit 5 arranged on the upper surface of the air inlet cover unit 1 and provided with the powder intercepting orifice plate 13 inside and used for covering the recovery port 4.

[0040] In this embodiment, the air duct 12 is divided into two sections, one section is located between the air inlet belt net frame unit 2 and the interception box unit 5, and the other section is located between the interception box unit 5 and the exhaust fan 11. The material of the air duct 12 is a PVC steel wire tube, so that it is not easy to be flattened in the radial direction, but the overall shape can be greatly bent and deformed, thereby allowing the air inlet belt net frame unit 2 to be pulled out and pushed in.

[0041] On the other hand, the powder interception orifice plate 13 is rectangular in shape, with an aperture of 0.5-2.5 mm, and its two side edges and top edge are respectively fixed to the three inner side surfaces of the interception box unit 5, ensuring that all the cooling airflow passes through the powder interception orifice plate 13, thereby obtaining a comprehensive powder interception and recovery effect.

[0042] In addition, the overall shapes of the air inlet cover unit 1, the air inlet mesh frame unit 2 and the air inlet bottom shell unit 3 are all rectangular frames, and the inner and outer lengths and widths of the three rectangular frames are consistent, so they are spliced ​​to form an integral rectangular box structure.

[0043] The air inlet cover unit 1 mainly functions as follows: high-temperature feed e enters, powder d falls and is recovered, and the first centralized air cooling operation in the feed forward direction. The air inlet belt frame unit 2 mainly functions as follows: intercepting agglomerated particles b, and the second centralized air cooling operation in the feed forward direction. The air inlet bottom shell unit 3 mainly functions as follows: low-temperature feed f is discharged, and the third centralized air cooling operation in the feed forward direction.

[0044] It should be noted that: First, the powder d falls on the feeding conveyor belt a, thereby achieving the effect of falling and recycling. At this time, the feeding conveyor belt a can rotate in the opposite direction to bring the powder d out of the cold air blower and then add it to the mixer or extruder for preparing hairy crab feed particles; Second, the temperature of high-temperature feed e is generally 50-70°C, the temperature of low-temperature feed f is generally 25-35°C, and the size of agglomerated particles b is uncertain, and is generally formed by the bonding and agglomeration of several or even dozens of qualified feed particles.

[0045] Finally, the interception box unit 5 is fixedly connected or integrally formed with the air inlet cover unit 1. When viewed from the top of the air cooler, the recovery port 4 is not visible and is completely covered by the interception box unit 5. The exhaust fan 11 can be located on the upper surface or the outer surface of the air inlet cover unit 1.

[0046] The air cooler also includes a striking and falling frame unit 6 which is arranged on the inner side surface of the air inlet belt mesh frame unit 2 and is used to cover the recovery port 4 when the exhaust fan 11 is turned on.

[0047] In this embodiment, the function of the recovery port 4 is: when the cold air machine is stopped, the powder d obtained on the powder interception orifice plate 13 can fall at the recovery port 4 and fall on the feed conveyor belt a, thereby achieving the dual functions of powder recovery and powder interception function reset.

[0048] Therefore, if the attached Figure 7 As shown, the vertical projection of the powder intercepting orifice plate 13 falls entirely within the recovery port 4. If the lower end of the recovery port 4 is open at this time, a large portion of the airflow will not pass through the powder intercepting orifice plate 13, resulting in a significant reduction in the powder recovery effect. This is one of the functions of the impact falling frame unit 6.

[0049] Correspondingly, if the purpose is only to seal the lower end of the recovery port 4, the impact-dropping frame unit 6 can be replaced by a simple hinged cover or a sliding cover.

[0050] Importantly, the basic function of the impact-dropping frame unit 6 is to cover and expose the recovery port 4, and its prominent function is to properly impact the air inlet cover unit 1 so that the powder d on the powder intercepting orifice plate 13 can be completely and quickly dropped and recovered.

[0051] The air inlet cover unit 1 includes an upper rectangular frame 101 , a conveyor belt mounting port 102 and an upper air inlet 103 arranged on the upper rectangular frame 101 , and a top plate 104 arranged on the upper rectangular frame 101 and provided with the recovery port 4 .

[0052] In this embodiment, the main body of the air cooler is made of stainless steel, and the conveyor belt upper mounting opening 102 and the upper air inlet 103 are arranged on two adjacent side surfaces of the upper rectangular frame 101 .

[0053] The air inlet mesh frame unit 2 includes a middle rectangular frame 201 arranged on the lower end surface of the upper rectangular frame 101 and provided with the air duct 12, an open plate 202 arranged on the inner side surface of the middle rectangular frame 201 and used to intercept agglomerated particles b, and a middle air inlet 203 arranged on the middle rectangular frame 201.

[0054] During the whole use of the air cooler, the air inlet cover unit 1 and the air inlet bottom shell unit 3 are fixed, and the air inlet belt mesh frame unit 2 needs to move horizontally. The purpose of the horizontal movement is twofold, namely, to recover the powder d and to recover the agglomerated particles b. When the air inlet belt mesh frame unit 2 moves horizontally, the air cooler needs to be temporarily shut down, that is, the exhaust fan 11 is shut down, and the feeding is suspended.

[0055] The middle air inlet 203 and the upper air inlet 103 are located on the same side of the air cooler, and the connection position of the air duct 12 on the middle rectangular frame 201 is located on the other opposite side.

[0056] Finally, the perforated plate 202 is in the shape of a flat plate or a V-shape, covering most or all of the area within the middle rectangular frame 201. Its opening size is much larger than that of the powder intercepting perforated plate 13, and is set to an aperture of 1.0-2.0 cm, which is used to intercept large-sized agglomerated particles b with relatively large degree of adhesion and agglomeration.

[0057] The air inlet bottom shell unit 3 includes a lower rectangular frame 301 arranged on the lower end surface of the middle rectangular frame 201 , a conveyor belt lower installation port 302 and a lower air inlet 303 arranged on the lower rectangular frame 301 , and a bottom plate 304 arranged on the lower rectangular frame 301 .

[0058] In this embodiment, the upper air inlet 103, the middle air inlet 203 and the lower air inlet 303 are all located on the same side.

[0059] The upper air inlet 103 and the lower air inlet 303 are horizontally aligned with the upper belt bodies of the feeding conveyor belt a and the discharging conveyor belt c, respectively, and the middle air inlet 203 is horizontally aligned with the perforated plate 202. The above positional relationship is set to allow the airflow to blow directly on the feed particles as much as possible, thereby improving the cooling effect.

[0060] When the air cooler is in normal use, the bottom plate 304 is placed on the ground.

[0061] The interception box unit 5 includes a lower opening box 501 disposed on the upper surface of the top plate 104 and used to cover the recovery port 4, and two pipe openings 502 disposed on the lower opening box 501 and used to install the air duct 12.

[0062] In this embodiment, the air inlet cover unit 1, the powder interception orifice plate 13 and the interception box unit 5 can be integrally formed, and the two pipe openings 502 are respectively used to connect to the two sections of air duct 12.

[0063] The frame unit 6 for impacting and dropping materials includes a vertical plate 601 which is arranged on the inner side surface of the air inlet belt mesh frame unit 2 and is pulled out laterally by the air inlet belt mesh frame unit 2 to impact the air inlet cover unit 1, a cover plate 602 which is arranged on the vertical plate 601 and is used to cover the recovery port 4, and a horizontal protruding plate 603 which is arranged on the vertical plate 601 and is connected to the inner side surface of the air inlet belt mesh frame unit 2 and is used to provide a horizontal distance for the impact action of the vertical plate 601.

[0064] In this embodiment, the general shape of the impact-dropping frame unit 6 is similar to a "Z shape", and the vertical plate 601 is used to properly impact the inner side surface of the upper rectangular frame 101, so that the powder d falls completely and quickly onto the feed conveyor belt a.

[0065] The cover plate 602 is always attached to the lower surface of the top plate 104 to cover the recycling port 4. The direct function of the horizontal protruding plate 603 is to move the vertical plate 601 away from the inner side of the upper rectangular frame 101, and the final function is to leave space for the vertical plate 601 to move horizontally, so that the cover plate 602 can expose the recycling port 4. For details, please refer to the attached Fig.10 .

[0066] A vertical support plate 9 for laterally blocking the middle rectangular frame 201 is provided on the outer side surface of the upper rectangular frame 101 and the outer side surface of the lower rectangular frame body 301 .

[0067] In this embodiment, the upper and lower ends of the vertical support plate 9 are respectively fixed to the upper rectangular frame 101 and the lower rectangular frame 301, and its functions include at least: First, reinforce and install the air inlet cover unit 1 and other structures thereon; Second, it serves as an end point indicator of the middle rectangular frame 201 being pulled out and then pushed in to reset, that is, as long as the middle rectangular frame 201 abuts against the vertical support plate 9, the upper rectangular frame 101 and the lower rectangular frame 301 are correctly connected.

[0068] The vertical support plates 9 are disposed on two adjacent outer sides of the middle rectangular frame 201 , and the other two adjacent outer sides of the middle rectangular frame 201 are respectively disposed with a sliding handle 7 for recovering powder and a sliding handle 8 for recovering agglomerated particles.

[0069] In this embodiment, the sliding handle 7 for powder recovery is pulled outwards to vibrate, drop, and recover powder d, corresponding to the pulling-out direction h of the air inlet belt mesh frame unit for powder recovery.

[0070] The agglomerated particle recovery sliding handle 8 is pulled outwards to expose and recover the agglomerated particles b, corresponding to the pulling direction k of the air inlet belt mesh frame unit for recovering the agglomerated particles.

[0071] On the other hand, the reasons why the above two directions are not combined into one are: When the middle rectangular frame 201 is pulled to recover the powder d, it only needs to ensure that the recovery port 4 is completely exposed, and the pulling distance can be small. However, when the middle rectangular frame 201 is pulled to recover the agglomerated particles b, a relatively large distance is required to ensure that the agglomerated particles b are exposed as much as possible for easy digging and taking out.

[0072] Therefore, the above two pulling actions should not be combined.

[0073] The air inlet cover unit 1 further includes a reinforcing mounting beam 105 disposed on the upper rectangular frame 101 .

[0074] In this embodiment, the reinforced mounting beam 105 can be used to connect to the wall, so that even if the air inlet belt mesh frame unit 2 is completely pulled out and removed, the air inlet cover unit 1 does not have an obvious problem of insufficient installation stability.

[0075] The above detailed description of the implementation methods of the present application is made in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various modifications can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the present application. These are all non-creative modifications and are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A cold air blower for preparing hairy crab feed, comprising an exhaust fan (11), an air duct (12), and a powder intercepting orifice plate (13), characterized in that: It also includes an air inlet hood unit (1) having the exhaust fan (11) on its outer surface and being used for inserting into the feed conveyor belt (a); an air inlet belt net frame unit (2) arranged on the lower end surface of the air inlet hood unit (1) and being provided with the air duct (12) and being used for intercepting agglomerated particles (b); an air inlet bottom shell unit (3) arranged on the lower end surface of the air inlet belt net frame unit (2) and being used for inserting into the discharge conveyor belt (c); a recovery port (4) arranged on the air inlet hood unit (1) and being used for collecting powder (d) dropped on the feed conveyor belt (a); and an interception box unit (5) arranged on the upper surface of the air inlet hood unit (1) and being provided with the powder interception orifice plate (13) inside and being used for covering the recovery port (4).

2. A cold air blower for preparing hairy crab feed according to claim 1, characterized in that: It also includes a crash-drop frame unit (6) which is arranged on the inner side surface of the air inlet belt mesh frame unit (2) and is used to seal the recovery port (4) when the exhaust fan (11) is turned on.

3. A cold air blower for preparing hairy crab feed according to claim 1, characterized in that: The air inlet cover unit (1) comprises an upper rectangular frame (101), a conveyor belt mounting port (102) and an upper air inlet (103) arranged on the upper rectangular frame (101), and a top plate (104) arranged on the upper rectangular frame (101) and provided with the recovery port (4).

4. A cold air blower for preparing hairy crab feed according to claim 3, characterized in that: The air inlet mesh frame unit (2) comprises a middle rectangular frame (201) arranged on the lower end surface of the upper rectangular frame (101) and provided with the air duct (12), a perforated plate (202) arranged on the inner side surface of the middle rectangular frame (201) and used for intercepting agglomerated particles (b), and a middle air inlet (203) arranged on the middle rectangular frame (201).

5. A cold air blower for preparing hairy crab feed according to claim 4, characterized in that: The air inlet bottom shell unit (3) comprises a lower rectangular frame (301) arranged on the lower end surface of the middle rectangular frame (201), a conveyor belt lower mounting opening (302) and a lower air inlet (303) arranged on the lower rectangular frame (301), and a bottom plate (304) arranged on the lower rectangular frame (301).

6. The air cooler for preparing hairy crab feed according to claim 3, characterized in that: The interception box unit (5) comprises a lower opening box (501) arranged on the upper surface of the top plate (104) and used to cover the recovery port (4), and two pipe openings (502) arranged on the lower opening box (501) and used to install the air duct (12).

7. A cooling fan for preparing hairy crab feed according to claim 2, characterized in that: The impact-dropping frame unit (6) comprises a vertical plate (601) arranged on the inner side surface of the air inlet belt mesh frame unit (2) and pulled out horizontally by the air inlet belt mesh frame unit (2) to impact the air inlet cover unit (1); a cover plate (602) arranged on the vertical plate (601) and used to cover the recovery port (4); and a horizontal protruding plate (603) arranged on the vertical plate (601) and connected to the inner side surface of the air inlet belt mesh frame unit (2) and used to provide a horizontal distance for the impact action of the vertical plate (601).

8. The air cooler for preparing hairy crab feed according to claim 5, characterized in that: A vertical support plate (9) for laterally blocking the middle rectangular frame (201) is provided on the outer side surface of the upper rectangular frame (101) and the outer side surface of the lower rectangular frame body (301).

9. A cooling fan for preparing hairy crab feed according to claim 8, characterized in that: The vertical support plates (9) are provided on two adjacent outer sides of the middle rectangular frame (201), and the other two adjacent outer sides of the middle rectangular frame (201) are provided with a sliding handle (7) for recovering powder and a sliding handle (8) for recovering agglomerated particles, respectively.

10. The air cooler for preparing hairy crab feed according to claim 3, characterized in that: The air inlet cover unit (1) further comprises a reinforcing mounting beam (105) arranged on the upper rectangular frame (101).

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