CN110691284B

CN110691284B - Ocean floats formula 5G signal basic station

Info

Publication number: CN110691284B
Application number: CN201911239806.5A
Authority: CN
Inventors: 赖传柏; 郑志辉
Original assignee: Individual
Current assignee: Dongying Huida Technology Entrepreneurship Service Co ltd
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2020-06-05
Anticipated expiration: 2039-12-06
Also published as: CN110691284A

Abstract

The invention discloses a marine floating type 5G signal base station, which comprises a machine body, wherein a floating body is arranged at the bottom end of the machine body, a support rod is arranged at one end of the machine body, a base station support is arranged at the other end of the support rod, base stations suitable for a 5G network are respectively arranged at two ends of the base station support, a main control circuit is arranged at one side of the machine body and is connected with a base station through a circuit, a moving mechanism for driving the marine floating type 5G signal base station to move in the sea is arranged at the other side of the machine body, a steering mechanism for controlling the moving direction is arranged at one side of the moving mechanism, a power generation mechanism is arranged in the middle of the support rod and is connected with the main control circuit through a circuit, a waterproof mechanism is arranged at: under the condition of severe weather, the waterproof mechanism is started, so that the safety of the base station and each electronic component can be protected to a great extent, the phenomenon of short circuit caused by water inflow is effectively prevented, and the reliability of the waterproof mechanism is improved.

Description

Ocean floats formula 5G signal basic station

Technical Field

The invention belongs to the field of 5G communication, relates to a 5G network base station, and particularly relates to a marine floating type 5G signal base station.

Background

A base station is a form of a radio station, which is a radio transceiver station for information transmission between a mobile telephone terminal and a mobile communication switching center in a certain radio coverage area, but has a problem of a small coverage area. For this reason, long-term research has been conducted, and various solutions have been proposed.

For example, chinese patent literature discloses a floating high-power 5G signal base station and a floating 5G signal base station overlay network [ application number: 201910056178.0], the floating high-power 5G signal base station comprises a 5G antenna array, a first floating body, an optical fiber and a first power supply device; the 5G antenna array is fixedly arranged on the first floating body; the optical fiber is used for connecting the 5G antenna array with the submarine optical cable so as to establish a communication channel; the first power supply device is used for supplying power to the 5G antenna array. The floating high-power 5G signal base station and the floating 5G signal base station coverage network provided by the embodiment of the invention can expand a shore-based network to the sea surface at lower cost, effectively improve the communication effect of a ship network and enhance the ship travel experience.

The scheme does not provide effective waterproof measures, and the phenomenon that water enters the base station to cause a circuit to be short-circuited in severe weather is very easy to occur, so that the base station is easy to damage.

Disclosure of Invention

The invention aims to solve the problems, and provides an ocean floating type 5G signal base station, which can greatly protect the safety of the base station and various electronic components by starting a waterproof mechanism under the condition of severe weather, effectively prevent the phenomenon of circuit short circuit caused by water inflow and improve the reliability of the invention.

In order to achieve the purpose, the invention adopts the following technical scheme: this 5G signal basic stations of ocean floating type includes the organism, the organism bottom is equipped with body, its characterized in that: the machine body is characterized in that one end of the machine body is provided with a strut, the other end of the strut is provided with a base station support, two ends of the base station support are respectively provided with a base station suitable for a 5G network, one side of the machine body is provided with a control cavity, a main control circuit is arranged in the control cavity, the main control circuit is connected with the base station through a circuit, the other side of the machine body is provided with a power cavity, one end of the power cavity is provided with a moving mechanism for driving the ocean floating type 5G signal base station to move in the ocean, the other end of the moving mechanism is arranged at the outer end of the power cavity, the other end of the power cavity is provided with a steering mechanism for controlling the moving direction, the other end of the steering mechanism is arranged at the outer end of the power cavity, the middle of the strut is provided with a power generation mechanism, the, the utility model discloses a waterproof structure, including first recess, first skeleton, third skeleton, waterproof cloth, engine body, main control circuit, first recess both ends respectively are equipped with the bracing piece, first skeleton both ends are located on the bracing piece, first skeleton one side is equipped with the second skeleton, second skeleton one side is equipped with the third skeleton, third skeleton one side is equipped with the fourth skeleton, first skeleton the second skeleton the third skeleton the fourth skeleton outer end covers there is the waterproof cloth, waterproof cloth one end is fixed in the fourth skeleton outer end, the waterproof cloth other end is fixed in the first recess, engine body one end is equipped with control waterproof mechanism's control mechanism, control mechanism pass through the circuit with main control circuit links to each other.

The waterproof mechanism is creatively designed, and is opened under the control of the control mechanism under the condition of severe weather, the upper end of the machine body is completely covered by the waterproof cloth, so that the safety of electronic components such as a base station and the like is protected, the phenomenon of circuit short circuit caused by water inflow is effectively prevented, and the reliability of the waterproof mechanism is improved.

In foretell 5G signal base stations of formula are floated to ocean, master control circuit includes the battery, the battery is located control chamber one end, the battery pass through the circuit with the basic station links to each other, battery one side be equipped with pass through the circuit with the PLC module that the battery links to each other, PLC module one side be equipped with through the circuit with the GPS module that the PLC module links to each other, GPS module one side is equipped with the wireless network module, the wireless network module pass through the circuit with the PLC module links to each other, the control chamber opening part is equipped with the capillary groove, capillary groove one end be equipped with through first screw with the fixed first end cover in capillary groove, first end cover one end is equipped with the waterproof board and locates in the capillary groove.

In foretell ocean showy formula 5G signal base station, moving mechanism includes first motor, first motor is located power cavity one end, first motor pass through the circuit with the PLC module links to each other, first motor one end is equipped with first power shaft, the first power shaft other end is equipped with the turbine, turbine one side be equipped with turbine meshing's worm, the worm both ends respectively are equipped with first bevel gear, first bevel gear one side be equipped with first bevel gear meshing's second bevel gear, the internal transmission shaft that is connected with of second bevel gear, the transmission shaft other end extends to power cavity outer end and is equipped with the screw.

In foretell ocean showy formula 5G signal base station, steering mechanism includes the second motor, power chamber opening part be equipped with through the second screw with the fixed second end cover of power chamber opening part, the second motor is located second end cover one end, the second motor pass through the circuit with the PLC module links to each other, the second motor other end is equipped with the second power shaft, the second power shaft other end extends to power chamber outer end and be equipped with the rudder blade.

In foretell ocean floating 5G signal base station, power generation mechanism includes the support, the support is located in the middle of the branch, the support both ends respectively are equipped with the fixed slot, fixed slot one side is equipped with solar cell panel, solar cell panel one end is equipped with the fixed plate, the fixed plate is located in the fixed slot and through the bolt fastening, the bolt other end is equipped with the nut, solar cell panel pass through the circuit with the battery links to each other.

In foretell ocean floating 5G signal base station, waterproofing mechanism includes first skeleton, organism one side is equipped with first recess, first recess both ends respectively are equipped with the bracing piece, first skeleton both ends are located on the bracing piece, first skeleton one side is equipped with the second skeleton, second skeleton one side is equipped with the third skeleton, third skeleton one side is equipped with the fourth skeleton, first skeleton the second skeleton the third skeleton the fourth skeleton outer end covers there is the tarpaulin, tarpaulin one end is fixed in the fourth skeleton outer end, the tarpaulin other end is fixed in the first recess.

In foretell 5G signal base stations of formula are floated to ocean, control mechanism includes the third motor, organism one side is equipped with the fixed slot, the third motor is located in the fixed slot, the third motor pass through the circuit with the PLC module links to each other, the third motor other end is equipped with the third power shaft, the third power shaft other end is equipped with the runner, runner one end is equipped with the connecting rod, the connecting rod other end with fourth skeleton fixed connection, organism one side is equipped with the second recess, when the connecting rod revolve extremely when in the second recess, the fourth skeleton is located in the first recess.

Compared with the prior art, the invention has the advantages that:

1. the GPS module and the wireless network module in the invention can remotely position the invention, and the PLC module is remotely controlled by wireless to drive other electronic components to operate, thereby improving the convenience and practicability of the invention.

2. The moving mechanism can drive the mobile phone to move on the sea under the control of the PLC module, so that the mobile phone is more convenient to arrange, can control the mobile phone to move around to improve the strength of communication signals in a specific area, and improves the practicability of the mobile phone.

3. The steering mechanism in the invention can move more flexibly on the sea surface, and the direction of the invention can be adjusted to enable the power generation mechanism to work more efficiently, thereby improving the practicability of the invention.

4. The charging mechanism can obtain electric energy under the condition of strong solar radiation, and stores redundant electric energy into the storage battery, so that the cruising ability of the solar energy storage battery is greatly improved, and the practicability of the solar energy storage battery is improved.

5. When the waterproof mechanism is in severe weather, the waterproof mechanism can be opened under the control of the control mechanism, the upper end of the machine body is completely covered by the waterproof cloth, the safety of electronic components such as a base station and the like is protected, the phenomenon of circuit short circuit caused by water inflow is effectively prevented, and the reliability of the waterproof mechanism is improved.

Drawings

Fig. 1 is a front view of a marine floating 5G signal base station provided by the present invention.

Fig. 2 is a rear view of the starting state of the waterproof mechanism of the marine floating 5G signal base station provided by the invention.

Fig. 3 is a bottom view of the marine floating 5G signal base station provided by the present invention.

Fig. 4 is a partial cross-sectional view of a cross-section of a marine floating 5G signal base station a provided by the present invention.

Fig. 5 is a partial cross-sectional view of a section of a marine floating 5G signal base station B provided by the present invention.

In the figure, 1, a machine body; 2. a float; 3. a strut; 4. a base station support; 5. a base station; 6. a control chamber; 7. a power cavity; 8. a first groove; 9. a support bar; 10. a master control circuit; 11. a storage battery; 12. a PLC module; 13. a GPS module; 14. a wireless network module; 15. a waterproof groove; 16. a first end cap; 17. a waterproof sheet; 18. a first screw; 20. a moving mechanism; 21. a first motor; 22. a first power shaft; 23. a turbine; 24. a worm; 25. a first bevel gear; 26. a second bevel gear; 27. a drive shaft; 28. a propeller; 30. a steering mechanism; 31. a second end cap; 32. a second screw; 33. a second motor; 34. a second power shaft; 35. a rudder blade; 40. a power generation mechanism; 41. a support; 42. fixing grooves; 43. a solar panel; 44. a fixing plate; 45. a bolt; 46. a nut; 50. a waterproof mechanism; 51. a first skeleton; 52. a second skeleton; 53. a third skeleton; 54. a fourth skeleton; 55. waterproof cloth; 60. a control mechanism; 61. fixing grooves; 62. a third motor; 63. a third power shaft; 64. a rotating wheel; 65. a connecting rod; 66. a second groove.

Detailed Description

As shown in fig. 1, fig. 2 and fig. 3, the ocean floating type 5G signal base station of the invention comprises a machine body 1, a floating body 2 is arranged at the bottom end of the machine body 1, a supporting rod 3 is arranged at the upper end of the machine body 1, a base station support 4 is arranged at the upper end of the supporting rod 3, base stations 5 suitable for 5G network are respectively arranged at two ends of the base station support 4, a control cavity 6 is arranged at the front side of the machine body 1, a main control circuit 10 is arranged in the control cavity 6, the main control circuit 10 is connected with the base stations 5 through a circuit, a power cavity 7 is arranged at the rear side of the machine body 1, a moving mechanism 20 for driving the ocean floating type 5G signal base stations to move in the ocean is arranged in the power cavity 7, the rear end of the moving mechanism 20 is arranged at the outer end of the power cavity 7, a steering mechanism 30 for controlling the moving direction is arranged at the rear, 1 upside of organism is equipped with waterproofing mechanism 50, waterproofing mechanism 50 includes first skeleton 51, 1 upside of organism is equipped with first recess 8, 8 both ends of first recess respectively are equipped with bracing piece 9, bracing piece 9 are located at first skeleton 51 both ends, the first skeleton 51 outside is equipped with second skeleton 52, the second skeleton 52 outside is equipped with third skeleton 53, the third skeleton 53 outside is equipped with fourth skeleton 54, first skeleton 51, second skeleton 52, third skeleton 53, fourth skeleton 54 outer end covers there is tarpaulin 55, the tarpaulin 55 front end is fixed in fourth skeleton 54 outer end, tarpaulin 55 rear end is fixed in first recess 8, 1 front end of organism is equipped with control mechanism 60 of control waterproofing mechanism 50, control mechanism 60 passes through the circuit and links to each other with master control circuit 10.

As shown in fig. 1 and 4, main control circuit 10 includes

battery

11, 6 left ends in control chamber are located to battery 11, battery 11 passes through the circuit and links to each other with basic station 5, battery 11 right side is equipped with the PLC module 12 that links to each other with battery 11 through the circuit, PLC module 12 front side is equipped with the GPS module 13 that links to each other with PLC module 12 through the circuit, GPS module 13 front side is equipped with wireless network module 14, wireless network module 14 passes through the circuit and links to each other with

PLC module

12, 6 opening parts in control chamber are equipped with

buckler

15, 15 upper ends in buckler 15 are equipped with first end cover 16 fixed through first screw 18 and

buckler

15, 16 lower extremes of first end cover are equipped with buckler 17 and locate in buckler 15. The GPS module 13 and the wireless network module 14 enable the invention to be remotely positioned, and the PLC module 12 is wirelessly and remotely controlled to drive other electronic components to operate, thereby improving the convenience and practicability of the invention.

As shown in fig. 1, 3 and 5, the moving mechanism 20 includes a first motor 21, the first motor 21 is disposed at the front end of the power cavity 7, the first motor 21 is connected to the PLC module 12 through a circuit, a first power shaft 22 is disposed at the rear end of the first motor 21, a worm wheel 23 is disposed at the other rear end of the first power shaft 22, a worm 24 engaged with the worm wheel 23 is disposed at the lower side of the worm wheel 23, the worm 24 is rotatably connected to the machine body 1 through a bearing, first bevel gears 25 are disposed at two ends of the worm 24, a second bevel gear 26 engaged with the first bevel gears 25 is disposed at the rear side of the first bevel gears 25, a transmission shaft 27 is connected to the second bevel gear 26, and the rear end of the transmission shaft 27 extends to the outer end of the power. The moving mechanism 20 can drive the invention to move on the sea under the control of the PLC module 12, so that the arrangement of the invention is more convenient, and the invention can be controlled to move around to improve the strength of communication signals in a specific area, thereby improving the practicability of the invention.

The steering mechanism 30 comprises a second motor 33, a second end cover 31 fixed at the opening of the power cavity 7 through a second screw 32 is arranged at the opening of the power cavity 7, the second motor 33 is arranged at the lower end of the second end cover 31, the second motor 33 is connected with the PLC module 12 through a circuit, a second power shaft 34 is arranged at the lower end of the second motor 33, and the lower end of the second power shaft 34 extends to the outer end of the power cavity 7 and is provided with a rudder blade 35. The steering mechanism 30 enables the present invention to move more flexibly on the sea surface, and the direction of the present invention can be adjusted to enable the power generation mechanism 40 to work more efficiently, thereby improving the practicability of the present invention.

As shown in fig. 1 and 4, the power generation mechanism 40 includes a bracket 41, the bracket 41 is disposed in the middle of the support rod 3, fixing grooves 42 are respectively disposed at two ends of the bracket 41, a solar cell panel 43 is disposed outside the fixing grooves 42, a fixing plate 44 is disposed at an inner end of the solar cell panel 43, the fixing plate 44 is disposed in the fixing grooves 42 and fixed by a bolt 45, a nut 46 is disposed at a right end of the bolt 45, and the solar cell panel 43 is connected to the battery 11 through a circuit. The charging mechanism 40 can obtain electric energy under the condition of strong solar radiation, and store redundant electric energy into the storage battery 11, so that the cruising ability of the invention is greatly improved, and the practicability of the invention is improved.

Control mechanism 60 includes third motor 62, organism 1 front side is equipped with fixed slot 61, third motor 62 is located in fixed slot 61, third motor 62 passes through the circuit and links to each other with PLC module 12, third motor 62 front end is equipped with third power shaft 63, third power shaft 63 front end is equipped with runner 64, runner 64 upper end is equipped with connecting rod 65, connecting rod 65 upper end and fourth skeleton 54 fixed connection, organism 1 front side is equipped with second recess 66, when connecting rod 65 revolves to in the second recess 66, fourth skeleton 54 is located in first recess 8, tarpaulin 55 covers organism 1 upper end. When the waterproof mechanism 50 is in severe weather, the waterproof mechanism can be opened under the control of the control mechanism 60, the upper end of the machine body 1 is completely covered by the waterproof cloth 55, the safety of electronic components such as the base station 5 is protected, the phenomenon of circuit short circuit caused by water inflow is effectively prevented, and the reliability of the invention is improved.

The specific operation mode of the specific embodiment of the invention is as follows: the invention is prevented from being in seawater, the floating body 2 generates buoyancy to enable the invention to float on the water surface, the seawater overflows the propeller 28 and the rudder blade 35 but does not overflow the upper end of the machine body 1, the base station 5 is the prior art and provides wireless coverage, and the solar cell panel 43 is the prior art and directly or indirectly converts solar radiation energy into electric energy through photoelectric effect or photochemical effect by absorbing sunlight. The wireless network module 14 can transmit the positioning information in the GPS module 13 to the remote control end, the wireless network module 14 is in the prior art and comprises a signal transmitting module and a signal receiving module, the signal transmitting module is responsible for transmitting signals, the signal receiving module is responsible for receiving signals, the remote control end can transmit information to the PLC module 12 through the wireless network module 14 to control the operation of the invention, the PLC module 12 is in the prior art and can store instructions for executing operations such as logic operation, sequence control, timing, counting, arithmetic operation and the like in the PLC module 12. When the PLC module 12 receives a forward command, the PLC module 12 controls the first motor 21 to rotate forward, the first motor 21 drives the worm wheel 23 to rotate through the first power shaft 22, the worm wheel 23 drives the worm 24 to rotate, the worm wheel 24 drives the transmission shaft 27 to rotate through the matching relationship between the first bevel gear 25 and the second bevel gear 26, the transmission shaft 27 drives the propeller 28 to rotate to push the present invention to advance, and if the PLC module 12 receives a backward command, the PLC module 21 controls the first motor 21 to rotate backward. When the PLC module 12 receives a steering instruction, the PLC module 12 controls the second motor 33 to rotate, and the second motor 33 drives the rudder blade 35 to deflect through the second power shaft 34. When the PLC module 12 receives an instruction to open the waterproof mechanism 50, the PLC module 12 drives the third motor 62 to rotate forward, the third motor 62 drives the rotating wheel 64 to rotate through the third power shaft 63, the rotating wheel 64 drives the fourth framework 54 to rotate clockwise through the connecting rod 65, then the fourth framework 54 drives the waterproof cloth 55 to move, the second framework 52 and the third framework 53 move accordingly, until the connecting rod 65 moves into the second groove 66, the fourth framework 54 moves into the first groove 8, at this time, the waterproof cloth 55 completely covers the upper end of the machine body 1, so as to play a waterproof role, if the PLC module 12 receives an instruction to close the waterproof mechanism 50, then the PLC module 12 drives the third motor 62 to rotate backward, the fourth framework 54 rotates counterclockwise, and the waterproof cloth 55 is folded.

The specific embodiments described herein are merely illustrative of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms float, strut, flashing, first skeleton, tarpaulin, link, runner, fixing groove etc. are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention and they are to be interpreted as any additional limitation which is not in accordance with the spirit of the present invention.

Claims

1. The utility model provides a sea floats formula 5G signal basic station, includes organism (1), organism (1) bottom is equipped with body (2), its characterized in that: the mobile phone is characterized in that a supporting rod (3) is arranged at one end of the machine body (1), a base station support (4) is arranged at the other end of the supporting rod (3), base stations (5) suitable for a 5G network are respectively arranged at two ends of the base station support (4), a control cavity (6) is arranged on one side of the machine body (1), a main control circuit (10) is arranged in the control cavity (6), the main control circuit (10) is connected with the base stations (5) through a circuit, a power cavity (7) is arranged on the other side of the machine body (1), a moving mechanism (20) for driving the ocean floating type 5G signal base stations to move in the ocean is arranged at one end of the power cavity (7), the other end of the moving mechanism (20) is arranged at the outer end of the power cavity (7), a steering mechanism (30) for controlling the moving direction is arranged at the other end of the power, the middle of the supporting rod (3) is provided with a power generation mechanism (40), the power generation mechanism (40) is connected with the main control circuit (10) through a circuit, one side of the machine body (1) is provided with a waterproof mechanism (50), the waterproof mechanism (50) comprises a first framework (51), one side of the machine body (1) is provided with a first groove (8), two ends of the first groove (8) are respectively provided with a supporting rod (9), two ends of the first framework (51) are arranged on the supporting rods (9), one side of the first framework (51) is provided with a second framework (52), one side of the second framework (52) is provided with a third framework (53), one side of the third framework (53) is provided with a fourth framework (54), the outer ends of the first framework (51), the second framework (52), the third framework (53) and the fourth framework (54) are covered with waterproof cloth (55), one end of the waterproof cloth (55) is fixed at the outer end of the fourth framework (54), the other end of the waterproof cloth (55) is fixed in the first groove (8), one end of the machine body (1) is provided with a control mechanism (60) for controlling the waterproof mechanism (50), and the control mechanism (60) is connected with the main control circuit (10) through a circuit.

2. The marine floating 5G signal base station of claim 1, wherein: the main control circuit (10) comprises a storage battery (11), the storage battery (11) is arranged at one end of the control cavity (6), the storage battery (11) is connected with the base station (5) through a circuit, a PLC module (12) connected with the storage battery (11) through a circuit is arranged on one side of the storage battery (11), a GPS module (13) connected with the PLC module (12) through a circuit is arranged at one side of the PLC module (12), a wireless network module (14) is arranged on one side of the GPS module (13), the wireless network module (14) is connected with the PLC module (12) through a circuit, a waterproof groove (15) is arranged at the opening of the control cavity (6), a first end cover (16) fixed with the waterproof groove (15) through a first screw (18) is arranged at one end of the waterproof groove (15), one end of the first end cover (16) is provided with a waterproof plate (17) and arranged in the waterproof groove (15).

3. The marine floating 5G signal base station of claim 2, wherein: the moving mechanism (20) comprises a first motor (21), the first motor (21) is arranged at one end of the power cavity (7), the first motor (21) is connected with the PLC module (12) through a circuit, a first power shaft (22) is arranged at one end of the first motor (21), a turbine (23) is arranged at the other end of the first power shaft (22), a worm (24) meshed with the turbine (23) is arranged on one side of the turbine (23), first bevel gears (25) are respectively arranged at two ends of the worm (24), a second bevel gear (26) meshed with the first bevel gear (25) is arranged on one side of the first bevel gear (25), a transmission shaft (27) is connected in the second bevel gear (26), and the other end of the transmission shaft (27) extends to the outer end of the power cavity (7) and is provided with a propeller (28).

4. The marine floating 5G signal base station of claim 2, wherein: steering mechanism (30) include second motor (33), power chamber (7) opening part be equipped with through second screw (32) with fixed second end cover (31) in power chamber (7), second motor (33) are located second end cover (31) one end, second motor (33) pass through the circuit with PLC module (12) link to each other, second motor (33) other end is equipped with second power shaft (34), second power shaft (34) extend to power chamber (7) outer end is equipped with rudder blade (35).

5. The marine floating 5G signal base station of claim 4, wherein: generating mechanism (40) includes support (41), support (41) are located in the middle of branch (3), support (41) both ends respectively are equipped with fixed slot (42), fixed slot (42) one side is equipped with solar cell panel (43), solar cell panel (43) one end is equipped with fixed plate (44), fixed plate (44) are located in fixed slot (42) and fixed through bolt (45), bolt (45) other end is equipped with nut (46), solar cell panel (43) pass through the circuit with battery (11) link to each other.

6. The marine floating 5G signal base station of claim 2, wherein: control mechanism (60) includes third motor (62), organism (1) one side is equipped with fixed slot (61), third motor (62) are located in fixed slot (61), third motor (62) pass through the circuit with PLC module (12) link to each other, third motor (62) other end is equipped with third power shaft (63), third power shaft (63) other end is equipped with runner (64), runner (64) one end is equipped with connecting rod (65), connecting rod (65) other end with fourth skeleton (54) fixed connection, organism (1) one side is equipped with second recess (66), when connecting rod (65) revolve extremely in second recess (66), fourth skeleton (54) are located in first recess (8).