Cable erecting mechanism for communication machine room

Abstract

The invention relates to the technical field of cable erection, and particularly discloses a cable erection mechanism for a communication machine room, which comprises a mounting platform, a protective cover is lapped on the top of the mounting platform, a mounting box is fixedly connected to the surface of the protective cover, an air pump is fixedly connected to the inner wall of the mounting box, and an air suction pipe is mounted at the input end of the air pump; an air outlet pipe is mounted at the output end of the air pump; through the arrangement of the mounting platform, the protective cover, the air pump, the exhaust pipe, a second connecting pipe, a sleeving frame and fan blades, during use, the input end of the air pump sucks in external air through the exhaust pipe, the output end of the air pump exhausts the air at a high speed through an air outlet pipe, and the second connecting pipe quickly conveys the air into the sleeving frame; the fan blades in the sleeving frame rotate, wind energy is conveyed into the protective cover in a large range through rotation of the fan blades, and therefore the cable protected in the protective cover is rapidly cooled and cooled, and the effect of uniform cooling and cooling of the cable is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of cable installation, and in particular relates to a cable installation mechanism for a communication room. Background Art

[0002] With the rapid development of information technology, the importance of communication rooms as the core node of information transmission and processing has become increasingly prominent. The interior of the communication room is full of various cables, which not only carry the task of data transmission, but also are related to the stability and reliability of the entire communication system. Therefore, the installation and management of cables have become a key link in the design and maintenance of communication rooms.

[0003] However, the traditional way of laying cables in communication rooms mostly adopts simple hanging or laying inside the room. Although this method is easy to construct, due to the dense equipment inside the communication room and the long operation time, the heat generated is large. Cables, as conductors, will also generate a certain amount of heat when current passes through. The traditional laying method lacks effective heat dissipation measures, resulting in increased cable temperature, which not only affects the transmission performance of the cable, but may also cause safety hazards such as fire. Therefore, staff need to improve it. Summary of the invention

[0004] The object of the present invention is to provide a cable laying mechanism for a communication room to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A cable laying mechanism for a communication room, comprising: Installation platform; A protective cover is overlapped on the top of the installation platform, a mounting box is fixedly connected to the surface of the protective cover, and an air pump is fixedly connected to the inner wall of the mounting box; An exhaust pipe is installed at the input end of the air pump, and an air outlet pipe is installed at the output end of the air pump. Both ends of the air outlet pipe are fixedly connected to a first connecting pipe, the surface of the air outlet pipe is fixedly connected to a second connecting pipe, the bottom end of the second connecting pipe is fixedly connected to a sleeve frame, the inner wall of the sleeve frame is fixedly connected to a support frame, the inner wall of the support frame is rotatably connected to a connecting rod, the surface of the connecting rod is fixedly connected to a fan blade, and the surface of the fan blade is inserted into the inner wall of the sleeve frame.

[0006] Preferably, both sides of the top of the mounting platform are fixedly connected with an installation frame, the inner wall of the installation frame is fixedly connected with a servo motor, a driving rod is installed at the output end of the servo motor, the top of the driving rod is fixedly connected with a winding rod, and a plurality of air holes are provided on the surface of the winding rod.

[0007] Preferably, the top end of the winding rod is fixedly connected to a mounting plate, the top of the mounting plate is rotatably connected to a fixing plate, and the top of the fixing plate is fixedly connected to the bottom end of the first connecting tube.

[0008] Preferably, a smoke sensor is fixedly connected to the top of the mounting platform, and a temperature sensor is fixedly connected to the top of the mounting platform on one side of the smoke sensor.

[0009] Preferably, the inner wall of the mounting platform is fixedly connected to a storage tank, the inner wall of the mounting platform located on the top of the storage tank is fixedly connected to an extraction pump, an extraction pipe is installed at the input end of the extraction pump, an ejection pipe is installed at the output end of the extraction pump, and the top end of the ejection pipe is fixedly connected to the top of the mounting platform.

[0010] Preferably, the surface and back of the mounting platform are fixedly connected with a positioning frame, the top of the positioning frame is fixedly connected with a protective collar, the inner wall of the protective collar is fixedly connected with a mounting block, and the inner wall of the mounting block is rotatably connected with a roller.

[0011] Preferably, a fixing tube is fixedly connected to the surface of the protective collar, an electric telescopic rod is fixedly connected to the inner wall of the fixing tube, an extrusion plate is fixedly connected to the bottom end of the electric telescopic rod, and the surface of the extrusion plate is plugged into the inner wall of the protective collar.

[0012] Preferably, a cable is wound around the surface of the winding rod, and the surface of the cable is inserted into the inner wall of the protective sleeve ring.

[0013] Preferably, a display screen is fixedly connected to one side of the mounting platform, a mounting plate is fixedly connected to one side of the mounting platform at the top of the display screen, a fixing bolt is threadedly connected to one side of the mounting plate, and a surface of the fixing bolt is threadedly connected to the inner wall of the protective cover.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) By installing the platform, protective cover, air pump, exhaust pipe, second connecting pipe, socket frame and fan blades, when in use, the input end of the air pump draws in external air through the exhaust pipe, and the output end of the air pump discharges the air at high speed through the exhaust pipe. The second connecting pipe quickly transports the air to the socket frame, thereby rotating the fan blades in the socket frame. The wind energy is transported to the inside of the protective cover over a large range through the rotation of the fan blades, thereby quickly cooling and dissipating the heat of the cables protected in the protective cover, thereby achieving the effect of uniformly cooling and dissipating the heat of the cables and facilitating the operation of the staff.

[0015] (2) By installing a frame, a winding rod, air holes and cables, when in use, the winding rod is used to drive the cables connected by winding on the surface to be retracted and released, and the effect of conveniently retracting and adjusting the cables on both sides is facilitated. The air is quickly transported to the inside of the winding rod through the first connecting tube, and the air is discharged through the air holes on the surface of the winding rod, thereby facilitating the cooling and heat dissipation of the cables on the surface of the winding rod, thereby achieving the effect of conveniently retracting and releasing the cables and cooling and heat dissipating the cables, and facilitating the operation of the staff.

[0016] (3) Through the arrangement of smoke sensors, temperature sensors, storage tanks, extraction pumps, extraction pipes and ejection pipes, when in use, the input end of the extraction pump extracts the carbon dioxide in the storage tank through the extraction pipe, and the output end of the extraction pump ejects the carbon dioxide from the top of the installation platform through the ejection pipe. Therefore, when the smoke sensor and the temperature sensor detect smoke or excessive temperature, it is convenient to extinguish the fire and cool the cables with carbon dioxide, and reduce damage to the cables, thereby achieving the effect of extinguishing the fire and cooling the cables.

[0017] (4) Through the arrangement of the protective collar, rollers, electric telescopic rod, extrusion plate and cables, when in use, the cable is inserted through the protective collar at the top of the positioning frame, and the cable is smoothly stretched through the rollers. The electric telescopic rod drives the extrusion plate at the bottom to move, and the cable inside the protective collar is quickly fixed and limited through the extrusion plate to prevent the cable from being dragged to the ground and prevent the cable from being maliciously stretched, thereby achieving the effect of conveniently stretching and fixing the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A perspective view of the present invention; Figure 2 is a three-dimensional diagram of the cable of the present invention; Figure 3 is a three-dimensional diagram of the protective cover of the present invention; Figure 4 is a three-dimensional diagram of a winding rod of the present invention; Figure 5 is a three-dimensional diagram of the protective sleeve ring of the present invention; Figure 6 is a three-dimensional diagram of a storage tank of the present invention; In the figure: 1. installation platform; 2. protective cover; 3. installation box; 4. air pump; 5. exhaust pipe; 6. exhaust pipe; 7. first connecting pipe; 8. second connecting pipe; 9. sleeve frame; 10. support frame; 11. connecting rod; 12. fan blade; 13. installation frame; 14. servo motor; 15. drive rod; 16. winding rod; 17. air vent; 18. installation plate; 19. fixed plate; 20. smoke sensor; 21. temperature sensor; 22. storage tank; 23. extraction pump; 24. extraction pipe; 25. ejection pipe; 26. positioning frame; 27. protective collar; 28. installation block; 29. ​​roller; 30. fixed pipe; 31. electric telescopic rod; 32. extrusion plate; 33. cable; 34. display screen; 35. installation plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Embodiment 1:

[0021] See also Figures 1 to 6 As shown, a cable laying mechanism for a communication room comprises: Installation platform 1; A protective cover 2 is overlapped on the top of the installation platform 1, a mounting box 3 is fixedly connected to the surface of the protective cover 2, and an air pump 4 is fixedly connected to the inner wall of the mounting box 3; An exhaust pipe 5 is installed at the input end of the air pump 4, and an air outlet pipe 6 is installed at the output end of the air pump 4. Both ends of the air outlet pipe 6 are fixedly connected with a first connecting pipe 7, the surface of the air outlet pipe 6 is fixedly connected with a second connecting pipe 8, the bottom end of the second connecting pipe 8 is fixedly connected with a sleeve frame 9, the inner wall of the sleeve frame 9 is fixedly connected with a support frame 10, the inner wall of the support frame 10 is rotatably connected with a connecting rod 11, the surface of the connecting rod 11 is fixedly connected with a fan blade 12, and the surface of the fan blade 12 is inserted into the inner wall of the sleeve frame 9.

[0022] When in use, a protective cover 2 is arranged on the top of the mounting platform 1, and an air pump 4 is arranged on the surface of the protective cover 2 through the mounting box 3. The staff connects the air pump 4 to the power supply, and the input end of the air pump 4 draws in external air through the exhaust pipe 5, and the output end of the air pump 4 discharges the air at a high speed through the outlet pipe 6, and a first connecting pipe 7 is arranged at both ends of the outlet pipe 6, and a second connecting pipe 8 is arranged on the surface of the outlet pipe 6, a sleeve frame 9 is arranged through the second connecting pipe 8, and a support frame 10 is arranged on the inner wall of the sleeve frame 9, and a connecting rod 11 is rotatably arranged on the inner wall of the support frame 10, and fan blades 12 are arranged on the surface of the connecting rod 11, and the second connecting pipe 8 quickly transports air to the sleeve frame 9, thereby rotating the fan blades 12 in the sleeve frame 9, and the wind energy is widely transported to the inside of the protective cover 2 through the rotation of the fan blades 12, thereby quickly cooling and dissipating the heat of the cables 33 protected in the protective cover 2.

[0023] Embodiment 2:

[0024] See also Figures 1 to 6 As shown, both sides of the top of the mounting platform 1 are fixedly connected with an installation frame 13, the inner wall of the installation frame 13 is fixedly connected with a servo motor 14, the output end of the servo motor 14 is installed with a driving rod 15, the top of the driving rod 15 is fixedly connected with a winding rod 16, the surface of the winding rod 16 is provided with a plurality of air holes 17, the top of the winding rod 16 is fixedly connected with a mounting plate 18, the top of the mounting plate 18 is rotatably connected with a fixed plate 19, the top of the fixed plate 19 is fixedly connected to the bottom end of the first connecting tube 7, the surface of the winding rod 16 is wound with a cable 33, and the surface of the cable 33 is inserted into the inner wall of the protective collar 27.

[0025] When in use, mounting frames 13 are provided on both sides of the top of the mounting platform 1, and servo motors 14 are provided on the inner walls of the mounting frames 13. The staff connects the servo motor 14 to a power source, and the output end of the servo motor 14 drives the driving rod 15 to rotate, and the driving rod 15 drives the winding rod 16 at the top to rotate, and the winding rod 16 is used to drive the cables 33 connected by surface winding to be retracted and released, and it is convenient to adjust the cables 33 on both sides conveniently, and a plurality of air holes 17 are provided on the surface of the winding rod 16, and a fixed disk 19 is rotatably provided at the top of the winding rod 16 through the mounting disk 18, and the top of the fixed disk 19 is fixed to the bottom end of the first connecting tube 7, and the air is quickly transported to the inside of the winding rod 16 through the first connecting tube 7, and the air is outputted by using the air holes 17 on the surface of the winding rod 16, thereby facilitating the cooling and heat dissipation of the cables 33 on the surface of the winding rod 16.

[0026] Embodiment three:

[0027] See also Figures 1 to 6As shown, a smoke sensor 20 is fixedly connected to the top of the mounting platform 1, a temperature sensor 21 is fixedly connected to the top of the mounting platform 1 on one side of the smoke sensor 20, a storage tank 22 is fixedly connected to the inner wall of the mounting platform 1, an extraction pump 23 is fixedly connected to the inner wall of the mounting platform 1 located at the top of the storage tank 22, an extraction pipe 24 is installed at the input end of the extraction pump 23, an ejection pipe 25 is installed at the output end of the extraction pump 23, and the top end of the ejection pipe 25 is fixedly connected to the top of the mounting platform 1.

[0028] When in use, a smoke sensor 20 and a temperature sensor 21 are respectively arranged on both sides of the top of the installation platform 1, and a storage tank 22 is arranged on the inner wall of the installation platform 1. Carbon dioxide is injected into the storage tank 22. An extraction pump 23 is arranged inside the installation platform 1 and on the top of the storage tank 22. The staff connects the extraction pump 23 to the power supply, and the input end of the extraction pump 23 extracts the carbon dioxide in the storage tank 22 through the extraction pipe 24, and the output end of the extraction pump 23 ejects the carbon dioxide from the top of the installation platform 1 through the ejection pipe 25. Therefore, when the smoke sensor 20 and the temperature sensor 21 detect smoke or excessive temperature, it is convenient to extinguish the fire and cool down the cable 33 by carbon dioxide, and reduce damage to the cable 33.

[0029] Embodiment 4:

[0030] See also Figures 1 to 6 As shown, the surface and back of the mounting platform 1 are fixedly connected with a positioning frame 26, the top of the positioning frame 26 is fixedly connected with a protective collar 27, the inner wall of the protective collar 27 is fixedly connected with a mounting block 28, the inner wall of the mounting block 28 is rotatably connected with a roller 29, the surface of the protective collar 27 is fixedly connected with a fixing tube 30, the inner wall of the fixing tube 30 is fixedly connected with an electric telescopic rod 31, the bottom end of the electric telescopic rod 31 is fixedly connected with an extrusion plate 32, and the surface of the extrusion plate 32 is plugged into the inner wall of the protective collar 27, the surface of the winding rod 16 is wound with a cable 33, and the surface of the cable 33 is plugged into the inner wall of the protective collar 27, one side of the mounting platform 1 is fixedly connected with a display screen 34, one side of the mounting platform 1 is fixedly connected with a mounting plate 35 located at the top of the display screen 34, one side of the mounting plate 35 is threadedly connected with a fixing bolt, and the surface of the fixing bolt is threadedly connected to the inner wall of the protective cover 2.

[0031] When in use, positioning frames 26 are provided on both sides of the installation platform 1, and the top of the positioning frame 26 is inserted with a cable 33 through a protective collar 27, and a plurality of mounting blocks 28 are provided on the inner wall of the protective collar 27, and rollers 29 are provided by rotating the mounting blocks 28, thereby facilitating smooth stretching of the cable 33 through the rollers 29, and a plurality of fixing tubes 30 are provided on the surface of the protective collar 27, and an electric telescopic rod 31 is provided on the inner wall of the fixing tube 30. When the staff connects the electric telescopic rod 31 to the power supply, the electric telescopic rod 31 drives the extrusion plate 32 at the bottom to move, and the cable 33 inside the protective collar 27 is quickly fixed and limited by the extrusion plate 32 to prevent the cable 33 from being dragged to the ground and to prevent the cable 33 from being maliciously stretched.

[0032] Embodiment five:

[0033] See also Figures 1 to 6 As shown in the figure, the cable laying mechanism for communication rooms is mainly used in various communication rooms, especially those with strict requirements on cable management, high requirements on heat dissipation performance, and the need to ensure the safety of cables, such as large data centers, cloud computing centers, and telecommunications operators' rooms. These rooms usually have a large number of cables, which require efficient and orderly management. At the same time, due to the dense equipment and long operation time, the heat dissipation problem is also very prominent. In addition, ensuring the safety of cables and preventing equipment damage and data loss caused by accidents such as cable failure or fire is also an important part of room management.

[0034] Location selection: Install the cable laying mechanism at an appropriate location in the communication room to ensure that the installation platform is stable and reliable, able to bear the weight of cables and equipment, and convenient for maintenance and operation by staff.

[0035] Layout adjustment: According to the layout and direction of the cables in the room, the positions of the mounting frame, winding rod and protective collar should be adjusted reasonably. The mounting frame is used to install the servo motor and drive rod, the winding rod is used to wind and store the cables, and the protective collar is used to protect and fix the cables. Through reasonable layout, the cables can be kept neat and tidy, which is convenient for subsequent management and maintenance.

[0036] Cable retraction: The winding rod drives the cables connected by the surface winding to be retracted and released in an orderly manner. Driven by the servo motor, the tightness and length of the cables can be easily adjusted to ensure that the cables can be quickly and accurately connected to the equipment when needed. At the same time, the design of the winding rod also makes the cables more compact and space-saving when stored.

[0037] Heat dissipation and cooling: Start the air pump, draw in external air through the exhaust pipe, and transport the air to the socket frame through the exhaust pipe, the first connecting pipe and the second connecting pipe. The air drives the fan blades to rotate in the socket frame, generating wind energy, which quickly cools and dissipates the heat of the cables inside the protective cover. At the same time, the air is output through the air holes on the surface of the winding rod to further cool and dissipate the heat of the cables. This design can ensure that the cables will not overheat during long-term operation, and improve the stability and reliability of the equipment.

[0038] Environmental monitoring: Smoke sensors and temperature sensors are installed on the top of the installation platform to monitor the environmental changes inside the computer room in real time. These sensors can detect abnormal conditions in the computer room in a timely manner, such as smoke and high temperature, and provide timely and accurate information for subsequent emergency treatment.

[0039] Fire extinguishing and cooling: Once the smoke sensor or temperature sensor detects an abnormal situation, the extraction pump is immediately started. The extraction pump sprays the carbon dioxide in the storage tank through the ejection pipe to extinguish the fire and cool the cables. Carbon dioxide has the characteristics of good fire extinguishing effect and little damage to equipment. It can effectively prevent the occurrence of fire accidents and protect the equipment and data security in the computer room.

[0040] Working principle: When in use, the staff connects the air pump 4 to the power supply, the input end of the air pump 4 draws in external air through the exhaust pipe 5, the output end of the air pump 4 discharges the air at high speed through the exhaust pipe 6, and the second connecting pipe 8 quickly transports the air to the sleeve frame 9, thereby rotating the fan blades 12 in the sleeve frame 9, and the wind energy is widely transported to the inside of the protective cover 2 through the rotation of the fan blades 12. The staff connects the servo motor 14 to the power supply, and the output end of the servo motor 14 drives the driving rod 15 to rotate, and the driving rod 15 drives the winding rod 16 at the top to rotate, and the winding rod 16 drives the cable 33 connected to the surface to be wound and released, and the air is quickly transported to the inside of the winding rod 16 through the first connecting pipe 7, and the air is output by using the air vents 17 on the surface of the winding rod 16, thereby facilitating the cooling and heat dissipation of the cable 33 on the surface of the winding rod 16, and the inside of the storage tank 22 is injected Carbon dioxide, the staff connects the extraction pump 23 to the power supply, the input end of the extraction pump 23 extracts the carbon dioxide in the storage tank 22 through the extraction pipe 24, and the output end of the extraction pump 23 ejects the carbon dioxide from the top of the installation platform 1 through the ejection pipe 25. Therefore, when the smoke sensor 20 and the temperature sensor 21 detect smoke or excessive temperature, it is convenient to extinguish the fire and cool the cable 33 through carbon dioxide, and reduce damage to the cable 33. The top of the positioning frame 26 is inserted with the cable 33 through the protective ring 27, and the roller 29 facilitates the smooth stretching of the cable 33. The staff connects the electric telescopic rod 31 to the power supply, and the electric telescopic rod 31 drives the extrusion plate 32 at the bottom to move, and the cable 33 inside the protective ring 27 is quickly fixed and limited by the extrusion plate 32 to prevent the cable 33 from being dragged to the ground and to prevent the cable 33 from being maliciously stretched.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cable laying mechanism for a communication room, characterized in that: include: Mounting platform (1); A protective cover (2) is overlapped on the top of the installation platform (1), a mounting box (3) is fixedly connected to the surface of the protective cover (2), and an air pump (4) is fixedly connected to the inner wall of the mounting box (3); An air extraction pipe (5) is installed at the input end of the air pump (4), and an air outlet pipe (6) is installed at the output end of the air pump (4); both ends of the air outlet pipe (6) are fixedly connected to a first connecting pipe (7); the surface of the air outlet pipe (6) is fixedly connected to a second connecting pipe (8); the bottom end of the second connecting pipe (8) is fixedly connected to a sleeve frame (9); the inner wall of the sleeve frame (9) is fixedly connected to a support frame (10); the inner wall of the support frame (10) is rotatably connected to a connecting rod (11); the surface of the connecting rod (11) is fixedly connected to a fan blade (12); and the surface of the fan blade (12) is plugged into the inner wall of the sleeve frame (9).

2. A cable installation mechanism for a communication room according to claim 1, characterized in that: Both sides of the top of the installation platform (1) are fixedly connected to an installation frame (13), the inner wall of the installation frame (13) is fixedly connected to a servo motor (14), the output end of the servo motor (14) is installed with a driving rod (15), the top end of the driving rod (15) is fixedly connected to a winding rod (16), and the surface of the winding rod (16) is provided with a plurality of groups of air holes (17).

3. A cable installation mechanism for a communication room according to claim 2, characterized in that: The top end of the winding rod (16) is fixedly connected to a mounting plate (18), the top of the mounting plate (18) is rotatably connected to a fixing plate (19), and the top of the fixing plate (19) is fixedly connected to the bottom end of the first connecting tube (7).

4. The cable installation mechanism for a communication room according to claim 1, characterized in that: A smoke sensor (20) is fixedly connected to the top of the installation platform (1), and a temperature sensor (21) is fixedly connected to the top of the installation platform (1) on one side of the smoke sensor (20).

5. The cable installation mechanism for a communication room according to claim 1, characterized in that: The inner wall of the mounting platform (1) is fixedly connected to a storage tank (22); the inner wall of the mounting platform (1) is located at the top of the storage tank (22) and is fixedly connected to an extraction pump (23); an extraction pipe (24) is installed at the input end of the extraction pump (23); an ejection pipe (25) is installed at the output end of the extraction pump (23); and the top end of the ejection pipe (25) is fixedly connected to the top of the mounting platform (1).

6. The cable installation mechanism for a communication room according to claim 1, characterized in that: The surface and back of the mounting platform (1) are both fixedly connected to a positioning frame (26), the top of the positioning frame (26) is fixedly connected to a protective collar (27), the inner wall of the protective collar (27) is fixedly connected to a mounting block (28), and the inner wall of the mounting block (28) is rotatably connected to a roller (29).

7. A cable installation mechanism for a communication room according to claim 6, characterized in that: A fixing tube (30) is fixedly connected to the surface of the protective collar (27), an electric telescopic rod (31) is fixedly connected to the inner wall of the fixing tube (30), an extrusion plate (32) is fixedly connected to the bottom end of the electric telescopic rod (31), and the surface of the extrusion plate (32) is plugged into the inner wall of the protective collar (27).

8. The cable installation mechanism for a communication room according to claim 2, characterized in that: The surface of the winding rod (16) is wound with a cable (33), and the surface of the cable (33) is plugged into the inner wall of the protective sleeve ring (27).

9. The cable installation mechanism for a communication room according to claim 1, characterized in that: A display screen (34) is fixedly connected to one side of the mounting platform (1), a mounting plate (35) is fixedly connected to one side of the mounting platform (1) located on the top of the display screen (34), a fixing bolt is threadedly connected to one side of the mounting plate (35), and a surface of the fixing bolt is threadedly connected to the inner wall of the protective cover (2).

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