83 results about "Head cooling" patented technology

The utility model discloses a high-frequency quenching device for high-strength bolt production, which comprises a frame and a cooling tank positioned at the front end of the frame, a high-frequency quenching mechanism is arranged on the frame, and a reciprocating lifting mechanism is arranged in the cooling tank. The high-frequency quenching mechanism comprises a driving motor, a group of rotating shafts, two groups of chain gears, a group of transmission chains, a plurality of groups of bearing plates, a mounting plate, a high-frequency quenching machine and an electromagnetic heating coil. The continuous quenching device has the beneficial effects that a group of transmission chains drive a plurality of groups of bearing plates to rotate and are matched with a high-frequency quenching machine to drive an electromagnetic heating coil to carry out continuous quenching treatment on the head of the high-strength bolt, so that the quenching efficiency is improved; the quenched high-strength bolt falls into the bearing screen frame, the reciprocating lifting mechanism drives the bearing screen frame to do reciprocating lifting motion in the cooling tank, the head of the high-strength bolt is rapidly cooled, cooling of the head of the high-strength bolt is more uniform, after cooling is completed, the bearing screen frame is lifted to the top, and the high-strength bolt is conveniently taken out.

In order to provide an electric motor designed for operation with winding head cooling, which is optimized with respect to the frictional power loss caused by a cooling fluid entering the air gap between the rotor and the stator, an electric motor is proposed, comprising a rotor and a stator (10), the stator (10) comprising coil windings (12) made of electrical conductors, the coil windings (12) each form a winding head (14a, 14b) at an axial end (13) of the stator (10), the winding head (14a, 14b) comprising at least one first radially innermost layer of conductor sections (16a, 16b), the conductor sections (16a, 16b) of the first layer, in particular all, of each winding head (14a, 14b) having at least one bend in the same circumferential direction, and the first layer, in particular all of the conductor sections (16a, 16b) of each winding head (14a, 14b) having at least one second radially innermost layer of the conductor sections (16a, 16b). The conductor sections (16a, 16b) of the first layer are arranged such that the conductor sections (16a, 16b) have an inclined course with respect to the circumferential direction of the stator (10), the electric motor has a predetermined direction of rotation (R) for driving a shaft connected to the rotor, and wherein the direction of bending of the conductor sections (16a, 16b) of the first layer at the two axial ends (13) of the stator (10) coincides with the direction of rotation (R) of the electric motor.

The utility model belongs to the technical field of UPS power supplies, and particularly relates to a UPS power supply convenient for heat dissipation, which comprises a UPS power supply body and a wiring panel, the wiring panel is arranged on the surface of the head part of the UPS power supply body, a head part air inlet channel is arranged at the joint of the head part of the UPS power supply body and the wiring panel, a tail part air inlet channel is arranged at the tail part of the UPS power supply body, and the head part air inlet channel is communicated with the wiring panel. A head cooling fan is installed at the position, corresponding to the head air inlet channel, of one end of the upper surface of the UPS body, and a tail cooling fan is installed at the position, corresponding to the tail air inlet channel, of the other end of the upper surface of the UPS body. The inner cavity of the UPS body is divided into a plurality of groups of battery pack mounting cavities through the flame-retardant partition plates, battery packs can be separated, the distance between the battery packs is increased, heat dissipation of the battery packs is facilitated, air is blown from bottom to top in the battery packs through the vent holes, the tail part can transversely blow air to the battery packs, and the heat dissipation efficiency of the battery packs is improved. The heat dissipation efficiency of the battery pack can be improved.

A personal cooling system for cooling a person includes a head cooling cap. The head cooling cap includes an inner layer defining a cavity configured to receive a head of the person, an outer layer, an intermediate layer positioned between the inner layer and the outer layer, and an inlet coupled to the outer layer. The inner layer is formed from fluid permeable materials. The intermediate layer defines a plurality of openings extending therethrough. The inner layer and the intermediate layer cooperatively define an inner potential space positioned between the inner layer and the intermediate layer. The intermediate layer and the outer layer cooperatively define an outer potential space positioned between the intermediate layer and the outer layer. The outer potential space is configured to receive a fluid and provide the fluid to inner potential space through the plurality of openings.

The invention relates to the technical field of welding, in particular to welding equipment for mold production and machining. A cylinder I is fixedly connected to the welding head; a funnel is fixedly connected to the shell and communicates with the first cylinder through a hose. A cavity I is formed between the cylinder I and the welding head; the shell is fixedly connected with a mixer; the input end of the mixer is communicated with the cavity I through a hose; a second cylinder is fixedly connected to the outer side of the welding head and fixedly connected with the shell, and the second cylinder is fixedly connected with the first cylinder. A first spiral piece is fixedly connected to the inner side of the second cylinder and fixedly connected with the welding head. The mixer is arranged beside the welding head, gypsum is directly smeared after welding, station transferring is not needed, and efficiency is improved; high-temperature clear water obtained after welding head cooling and preheated gypsum powder are prepared into high-temperature gypsum slurry in a mixer, the high-temperature gypsum slurry is smeared to the repair welding position, uniform cooling is achieved, and the cracking risk is reduced; the design solves the problems of welding head heat dissipation and gypsum preheating at the same time, and the practical value is high.

The material of this product is synthetic resin and liquid latent heat material. The product is filled with liquid latent heat material (phase change material) and after cooling in a refrigerator, it is placed inside a hat or helmet and worn on the head to reduce body heat.

The utility model relates to a transmission roller shaft head cooling mechanism for a toughening furnace, which comprises a passage arranged in a framework of a lower furnace body, a fan connected with an inlet of the passage and an air hole arranged at the upper part of the framework of the lower furnace body and communicated with the passage, and the position of the air hole corresponds to the position of a supporting roller shaft head and faces the supporting roller shaft head; the number of the passages is two, the passages are respectively arranged in the frameworks on the two sides of the lower furnace body corresponding to the supporting roller shaft head, the number of the fans is at least two, and one passage is provided with at least one fan. The fan, the passages in the framework and the air holes form a cooling channel, air generated by rotation of the fan is sprayed out of the air holes through the passages in the framework, and the positions of the air holes correspond to the positions of the shaft heads of the supporting rollers, so that airflow sprayed out of the air holes is blown to the positions of the shaft heads, the shaft heads can be cooled, high-temperature deformation of the shaft heads is avoided, and the service life of the supporting rollers is prolonged. And meanwhile, the airflow can blow away heat flow emitted from the top and bottom of the furnace body, and heat accumulation at the head of the supporting roller shaft is reduced.

The utility model relates to the field of welding machines, in particular to an automatic cooling type ultrasonic welding machine. The welding machine comprises a machine base, an ultrasonic welding head and a welding head lifting air cylinder, a cylinder body of the welding head lifting air cylinder is fixed to the machine base, a piston rod of the welding head lifting air cylinder is connected to the ultrasonic welding head, a product front end positioning mechanism is installed on the machine base, a first air pipe and a second air pipe are connected to the machine base, and the first air pipe and the second air pipe are both connected to an air receiving mechanism. An electronic proportional valve is installed on an air path of the welding head lifting air cylinder. A product to be welded is positioned through the product front end positioning mechanism. And the gas receiving mechanism is matched with the two gas pipes to cool the ultrasonic welding head or spray nitrogen to the product, so that the product is prevented from being oxidized.

A head cooling apparatus for cooling a user's head includes a cap which defines a cavity configured for receiving the user's head. The cap comprises a base member which defines a rim of the cap and extends toward a top end of the cap. The cap also comprises a containment member which is coupled to the base member and a heat transfer substance which is housed in an interior space in the containment member. A covering is removably mountable over the cap.

The ice cap for cooling the head comprises an ice cap body, the ice cap body comprises a forehead cooling area, a head top cooling area, an occipital area and a temperature display module, and the forehead cooling area, the head top cooling area and the occipital area are sequentially and flexibly connected and can deform to define a head containing area. The forehead cooling area comprises an outer layer and a hydrogel adhesion layer coated on the inner surface of the outer layer, the head top cooling area is provided with a plurality of head top ice bag areas, head top ice bags are arranged in the head top ice bag areas in a matched mode, and the temperature display module is arranged in the forehead cooling area. The temperature of the forehead cooling area is monitored and displayed through a temperature display module. The ice cap is simple in structure and convenient to use, the temperature of the cap body can be conveniently mastered in time while the ice cap is attached to the head of a patient, and the cooling efficiency of the patient is improved.

A cap (100) with a head cooling device is provided with a head cooling device (1) and a cap (2), the head cooling device (1) is provided with a device main body (11) and a fan (12), and the device main body (11) is provided with: an air suction part (1122) which is an opening for sucking air into the fan (12); and an air delivery unit (113) for delivering the air sucked in from the air suction unit (1122) by the fan (12) into the cap (2). The device body (11) is provided with an upper surface part (111) constituting the upper surface and a lower surface part (112) constituting the lower surface, the air suction part (1122) is formed on the lower surface part (112), and the air delivery part (113) is formed between one end of the upper surface part (111) and one end of the lower surface part (112).

The utility model discloses a machine head cooling device of an injection molding machine in the technical field of injection molding machines, which comprises an operation table, a material injection box arranged above the operation table, a machine head body fixedly connected with the lower end of the material injection box, a molding unit arranged on the right side of the machine head body, and a splicing mechanism and an air guide mechanism arranged on the outer side of the machine head body. A first mounting frame is fixedly mounted at the front end of the operating table, a first air rod body is fixedly mounted at the upper end of the first mounting frame, the machine head cooling device of the injection molding machine is additionally provided with a splicing mechanism and an air guide mechanism, the splicing mechanism adopts a rapid splicing structure, and a heating assembly and a machine head body are separated; the heating assembly and the machine head body are directly separated, heat is released outwards, accumulation of the heat in the machine head body is avoided, the heat dissipation area is also increased, the heat can be quickly guided out, the air guide mechanism adopts a mode of guiding air to the splicing mechanism, the heat on the heating assembly and the machine head body is quickly taken away, and then the low-energy-consumption cooling effect is achieved.

The utility model discloses a head cooling and extruding device of a sealant extruder, which comprises an extruding mechanism used for extruding a self-sealant, and a cooling mechanism connected with the extruding mechanism and used for cooling the self-sealant, according to the head cooling extrusion device of the sealant extruder, the cooling channel is arranged in the cooling cylinder, and circulating water cooling is realized through the cooling water inlet and the cooling water return port, so that a self-sealant can be rapidly cooled to a proper temperature in the extrusion process, and the problem of low cooling efficiency of a traditional natural cooling and air cooling mode is effectively solved; by optimizing the internal structure of the cooling cylinder, the cooling medium can be uniformly distributed in the cooling channel, the extruded self-sealing glue is uniformly heated in the whole cooling process, and the local supercooling or superheating phenomenon is avoided, so that the glue material performance change caused by nonuniform cooling is reduced, and the product quality is improved.

The utility model relates to the technical field of electronic jacquard machines, in particular to an electronic jacquard machine faucet cooling device which comprises a machine body, a driver and a faucet shell are arranged on the machine body, a cold air assembly is arranged on the faucet shell, and an exhaust pipe is fixedly connected to the cold air assembly. The exhaust pipe is provided with a cooling assembly used for enhancing the heat dissipation effect of the interior of the faucet shell and the heat dissipation effect of the driver. The cooling assembly comprises an upper pipeline and a lower pipeline which are arranged in the faucet shell. By means of the cooling assembly, when cold air is conveyed into the faucet shell and the exhaust plate is driven to move towards the left side, most of the cold air in the exhaust pipe is exhausted to the surface of the driver through the exhaust plate, the cold air can act on the driver more directly, the heat dissipation effect is better, the cooling rate is higher, and the service life of the faucet is prolonged. And in the process that the exhaust plate moves back and forth on the top of the driver, the faucet shell is in a sealed state, cold air stays in the faucet shell for a longer time, and the cold air can conduct heat exchange more effectively to achieve the cooling purpose.

A cylinder head structure that can increase the rigidity of an area corresponding to an area between cylinder bores and improve a sealing force of an inter-bore corresponding portion positioned above between adjacent cylinders when enhancing the sealing force between a cylinder block and the cylinder head to improve engine output. The cylinder head structure includes: insertion walls through which right and left fastening bolts arranged between adjacent cylinders pass; a head upper wall connecting upper end portions of a pair of the insertion walls; and a cylinder head bottom wall, and a head cooling water channel is surrounded by those four walls (insertion walls, head upper wall, cylinder head bottom wall), and a vertical wall in a state of extending left and right spanning the head upper wall and the cylinder head bottom wall to block the head cooling water channel is formed between the pair of insertion walls.

The invention relates to a separately excited rotor (RO) for an electric machine (EM) of an at least partially electrically driven motor vehicle (KFZ), comprising: a rotor shaft (RW) having a shaft cavity (WHR) and an outer circumferential surface (AM); a laminated core (BP) which is arranged on the outer circumferential surface (AM) and which has at least one protruding pole (AP); a rotor winding (RWI), which is arranged on the protruding poles (AP) and has a winding head (WK), which protrudes beyond an end face (SS) of the laminated core (BP), which end face is formed in the axial direction of the rotor (RO); an end cap (EK) which covers the winding head (WK) at least partially and / or in sections; a container (RV) arranged and / or formed between the end cap (EK) and the end face (SS), said container having at least one outflow opening (AOE) and a through-opening (DLO) formed in a shaft wall (WW) of the rotor shaft (RW), a cooling medium (KM) can flow out of a shaft cavity (WHR) of the rotor shaft (RW) via the through-hole (DLO), is received by the container (RV) and leaks out of the container (RV) via the outflow opening (AOE) and reaches the winding head (WK).

The neck cooling device 1 of this product is composed of two overlapping sheets 2 and 3. In the reference front view showing the welded portion, the yellow portion is the welded portion 4, and as shown in the reference cross-sectional view, the portion other than the welded portion 4 is a hollow portion 5. As shown in the reference front view showing the connected tubes, one end of the water supply tube 7 is connected to one tube connection portion 6, and one end of the water discharge tube 9 is connected to the other tube connection portion 8. The neck cooling device 1 is inserted through the insertion opening 11 shown in the reference front view showing the neck cover, and the neck cooling device 1 is attached to the neck cover 10 as shown in the reference front view showing the attached state to the neck cover. An elastically deformable curved shape-retaining plate is inserted through the insertion opening 11. Furthermore, the other ends of the water supply tube 7 and the water discharge tube 9 are each connected to a water cooling portion. The neck cover 10 is attached to the neck as shown in the reference oblique view showing the usage state. The neck cover 10 can be stably attached to the neck by the elastic force of the curved shape-retaining plate. Then, the water cooled in the water cooling section is sent by a pump from the water supply tube 7 to the cavity 5, and the water that passes through the cavity 5 is discharged from the water discharge tube 9, sent to the water cooling section where it is cooled again, and then sent to the cavity 5 via the water supply tube 7. In this way, the cooled water circulates inside the neck cooling device 1, cooling the neck.

The invention relates to the related technical field of cooling clothes, in particular to a physical cooling clothes with a bag body formed by a membrane structure, which comprises a cooling jacket, a neck cooling sleeve and a head cooling sleeve, and the cooling jacket, the neck cooling sleeve and the head cooling sleeve are respectively composed of a welding block, a first membrane structure and a second membrane structure; the second film structure faces inwards, when the second film structure makes contact with the human body, the sponge layer plays a role in slowly releasing temperature and isolating too low temperature, excessive temperature stimulation is avoided, the somatosensory comfort degree is improved, and the effective cooling time is prolonged; when the first film structure makes contact with the human body, it can be guaranteed that cold energy is rapidly transmitted, the physical cooling effect is improved, the multiple welding blocks are evenly distributed in the bag body, the honeycomb-imitating hexagonal structure and the middle pressing ring are arranged, and the structural strength is good and the stability is extremely high; according to actual requirements, different film structures are attached to the surface of the human body for physical cooling, the somatosensory comfort of a user is improved, frostbite is avoided, and the physical fever abatement effect is improved.

The utility model relates to the field of welding equipment, and discloses a pipe welding machine head simultaneous cooling structure which comprises a handle, one end of the handle is fixedly connected with a connecting column, the outer portion of the connecting column is rotatably connected with a machine body, the inner portion of the machine body is fixedly connected with a welding arc plate, and the upper side and the lower side of the welding arc plate are connected with fixed arc plates in a sliding mode. And the interior of the connecting column is fixedly connected with a cooling assembly for taking away heat, the exterior of the machine body is rotationally connected with a rotating rod, the interior of the rotating rod is rotationally connected with a rotating block, and the exterior of the rotating block is slidably connected with a limiting block. According to the utility model, the rotating block is rotated by shifting the rotating rod, the fixed arc plate is rotated and opened, a pipe needing to be welded is placed inside, and when the pipe is welded, external cooling liquid is conveyed to the welding arc plate along the pipe through the cooling pump by using the cooling pipe, so that the pipe is cooled, and the welding machine is prevented from being overheated and damaged.

The application discloses a ground charging system for a new energy shunting locomotive and relates to the technical field of new energy shunting locomotives.The technical points of the ground charging system include a charging pile body, charging cables symmetrically and fixedly installed on the side of the charging pile body, and a hollow wire supporting rod.The end of the charging cable away from the charging pile body is fixedly installed with a charging gun head.The outer side of the charging pile body is provided with a wire supporting structure.The hollow wire supporting rod wire supporting structure includes two hollow wire supporting rods rotatably connected to the two sides of the charging pile body.The wire supporting structure is arranged to realize the winding and unwinding of the charging cable, avoid the direct dragging of the cable on the ground, reduce the friction with the ballast, effectively prevent the abrasion of the outer sheath of the cable, form a two-way airflow by using the air pump, the air guide cavity, the ring cylinder and the gun head cooling channel and other airway structures, take away the heat of the cable and the gun head, blow off the surface dust, guarantee the charging efficiency, delay the aging of the insulation layer, and improve the safety and the service life of the equipment.

The invention discloses a spent fuel container intelligent centrifugal casting system which comprises a spent fuel container and further comprises a five-axis cradle mechanism. An iron liquid pouring unit; the directional cooling and material adding unit is provided with a multi-nozzle cooling device and a multi-channel inoculation material adding device; the intelligent control system comprises a pouring control unit, a centrifugal machine control unit, a cooling and material control unit, a data acquisition unit, an adjusting unit and a central processing unit, the invention further discloses a control method of the intelligent centrifugal casting system for the spent fuel container. According to the technology, in the aspect of all-posture adaptability, + / -90-degree stepless switching of the container is achieved through the five-axis cradle mechanism, the elastic coupler belt transmission is matched, and the problem that materials are not evenly distributed due to the fixed posture in traditional casting is solved.

Provided is a liquid cooling system for a charging gun and a charging gun, relating to the technical field of charging guns. In the liquid cooling system for a charging gun, a head cooling assembly includes a head housing, a first head seal assembly, a second head seal assembly, and a third head seal assembly. The head housing is provided with a terminal port and a head inlet. The terminal passes through the terminal port and the connection end of the terminal is accommodated in the head housing. The head inlet is configured to enable a cable extend into the head housing to connect to the connection end of the terminal. The first head seal assembly is sealingly disposed at a joint between the connection end of the terminal and the cable. The second head seal assembly is sealingly disposed at the terminal port.

The utility model provides a graphitization furnace end cooling device, and relates to the technical field of graphitization furnace auxiliary cooling, the graphitization furnace end cooling device comprises a shell, a fixing assembly is arranged on the shell, and the fixing assembly comprises a fixing plate fixed with the shell. Cooling gas generated by the refrigeration box is conveyed into the cross-shaped air outlet barrel through the air outlet barrel and finally sprayed out of the cross-shaped air outlet barrel, the furnace end is directly cooled through the cooling gas, the second driving gear, the second driven gear, the air outlet barrel and the cross-shaped air outlet barrel can be driven by the working motor to rotate, and therefore the furnace end is cooled. The cooling effect on the furnace end can be further improved through the rotating cross-shaped air outlet barrel, meanwhile, the air outlet barrel rotates to drive a first driving gear, a first driven gear, a rotating rod and fan blades to rotate, hot air can be conveyed into a refrigeration box through the rotating fan blades through an air outlet pipe, and then good air flow circulation can be formed; and a hot gas recovery path is smoother.

Provided is a liquid cooling system for a charging gun and a charging gun, relating to the technical field of charging guns. In the liquid cooling system for a charging gun, a head cooling assembly includes a head housing, a first head seal assembly, a second head seal assembly, and a third head seal assembly. The head housing is provided with a terminal port and a head inlet. The terminal passes through the terminal port and the connection end of the terminal is accommodated in the head housing. The head inlet is configured to enable a cable extend into the head housing to connect to the connection end of the terminal. The first head seal assembly is sealingly disposed at a joint between the connection end of the terminal and the cable. The second head seal assembly is sealingly disposed at the terminal port.

This neck cooler is filled with a phase change material (PCM) that freezes at a specific temperature (e.g., 28°C) or below in multiple storage compartments that bulge out from the inside of the band-shaped member. It changes between solid and liquid states at that temperature, repeatedly absorbing and releasing heat, allowing for long-term cooling. The storage compartments are shaped like D-shaped blocks symmetrically arranged at both ends and in the center of the band-shaped member when viewed from the front, with multiple rectangular blocks arranged between the D-shaped blocks. Magnetic connectors are located on both ends of the band-shaped member, allowing the two ends to be easily connected.

The present application relates to the technical field of laser numerical control system, and particularly relates to a heat error compensation method and system of a laser numerical control system; the multi-source temperature monitoring module of the design comprises three groups of sensors: the first group is arranged at temperature measuring points such as a cutting head cooling channel, the second group is arranged at a feed shaft screw rod and a nut end, and an environment group is arranged at a non-moving end of a machine tool bed, so that key heat source temperature data can be comprehensively acquired and compensation accuracy is improved; a dynamic compensation model construction module constructs a dynamic heat error compensation model with a multivariate coupling relationship based on historical data, and can adjust compensation coefficients according to real-time temperature and position changes; a data acquisition unit acquires multi-state data, a model training unit inputs a neural network for training, and a model updating unit optimizes the model periodically; a compensation amount real-time calculation module is combined with motion parameters; a compensation execution control module converts the compensation amount into a control instruction, dynamically adjusts a servo motor, and a feedback verification unit monitors an actual position; if a deviation exceeds a threshold value, secondary correction is performed.

The invention relates to the technical field of war wound nursing, and discloses a portable war wound head cooling device which comprises a wrapping and sleeving mechanism and an auxiliary cooling mechanism, an anti-skid fixing mechanism is installed on the surface of the wrapping and sleeving mechanism, and a cold compress mechanism is installed between the wrapping and sleeving mechanism and the anti-skid fixing mechanism. And a carrying cooling mechanism is mounted at the end part of the cold compress mechanism. According to the portable war wound head cooling device, through the synergistic effect of the wrapping head sleeving mechanism and the anti-skid fixing mechanism, the cold compress mechanism can be stably restrained to the preset position, the fitting degree and reliability of cold compress operation are remarkably improved, meanwhile, the structural design of the portable war wound head cooling device fully considers the compatibility of individual soldier tactical equipment, and the practicability of the portable war wound head cooling device is improved. The special space is reserved for the wearing of the tactical helmet, so that soldiers can quickly recover the protection state in the sudden combat situation, and the soldiers can be put into combat without removing the device, thereby ensuring the continuous combat capability and the survival efficiency of the battlefield to the greatest extent.

The embodiment of the application provides a method for reducing the temperature difference between the head and tail of a directly rolled square billet, which comprises the following steps: during the direct rolling of the square billet, an 8-machine 8-flow mode is adopted to increase the drawing speed of the square billet to 4 m / s, so that the head cooling time of the square billet is shortened by 45 s; a high-temperature-resistant alloy ground roller is used to form an ejection roller way, two vertical heat preservation roller ways are symmetrically arranged along the two sides of the ejection roller way and taking the ejection roller way as the center, so that the head of the square billet is heat preserved by moving the heat preservation roller way during the passing of the square billet through the ejection roller way, and the tail of the square billet is cooled.

This head cooling device is designed to be wrapped around the user's head to cool the head. The item includes a detachable cover and a cooling pack. The cooling pack of this item has five storage compartments containing PCM cooling material. The five storage compartments of the cooling pack are arranged in a row, and attachment sections with hook surfaces of a hook-and-loop fastener are provided at both ends of the five storage compartments. The cover of this item is made by sewing together stretchable fabric. The front and back sides of the cover's fabric are brushed to allow the hook surfaces of the hook-and-loop fastener to be attached and detached. The cover has an attachment section for attaching the cooling pack and two bands extending from both ends of the attachment section. Both ends of the attachment section of the cover are provided with pouches that fit into the attachment section and part of the storage compartment of the cooling pack. The cooling pack can be attached to the attachment section of the cover even when turned inside out with the bottom facing up. The two bands of the cover are each provided with a hook surface of a hook-and-loop fastener. The article can be kept wrapped around the user's head by connecting the two bands together by adhering the hook-and-loop fastener of one band to the raised surface of the other band.