35 results about "Vertical path" patented technology

Storage system for storing products and / or semi-finished products, preferably slab-shaped products such as ceramic slabs, carried by supports, wherein said system comprises a plurality of uprights; a plurality of support elements of the supports arranged on said uprights so as to define a plurality of storage positions of respective supports arranged in vertical succession along said uprights so as to define columnar storage units; wherein an access path to said storage positions is defined between said uprights for said supports, and wherein said access path is a vertical path, wherein the system comprises a lifting device configured to move at least one of said supports between the respective storage position and a free position; wherein said free position is arranged vertically below said storage position; wherein said lifting device is mounted on a carrier movable between a loading and / or unloading position of said products and said free position.

A cooling device for a cooling operation of a flat metallic product is provided, the cooling device being located in an essentially vertical path including: a tank filled with a coolant bath defining a coolant surface, the tank including at least two openings, one on the upper surface and one on the bottom surface wherein the flat metallic product can pass through, the opening on the bottom surface being equipped with a sealing mean, two series of projecting devices, oriented essentially horizontally, on two opposite tank sides, the projecting devices being immersed in the coolant bath, each series of projecting devices having an uppermost projecting device being defined as the closest projecting device to the coolant surface, at least the uppermost projecting device on both sides being downwardly inclined of an angle of 20° to 40° compared to the horizontal.

This utility model discloses a netting lifting system, including a netting rack end face. Each of the four corners of the netting rack end face is equipped with a traction execution module. The inner side of each traction execution module is provided with a traction limiting guide rail, a transmission end connecting unit, and opposing limiting pillars. The traction limiting guide rail is used to slide and limit the vertical lifting of the traction execution module. The netting rack support module is connected to a breeding platform, and the transmission end connecting unit is connected to the platform's traction end, providing power transmission for the vertical lifting of the traction execution module. The symmetrical arrangement of the traction limiting guide rail and the opposing limiting pillars forms a rigid track, allowing the directional roller transmission component to have fitting guide cavities on both sides that strictly engage with the pillars, forcibly limiting its sliding only in the vertical direction. This greatly restricts the horizontal degree of freedom, ensuring that the lifting process strictly follows a vertical path, reducing swaying and deviation, and improving the overall stability after lifting and adjusting.

The application belongs to the technical field of slow descent devices, and specifically discloses a semi-automatic heavy object slow descent device for hoisting, which can be remotely controlled and comprises a fixing frame, a slow descent device and a winch, a cable is arranged in the slow descent device in a matched mode, a displacement mechanism is arranged directly below the front end of the fixing frame, the displacement mechanism comprises a rectangular box, a maintenance mechanism is arranged below the rectangular box, the maintenance mechanism comprises an L-shaped support, a lubricating assembly and a cleaning assembly, a discharging assembly is arranged at the bottom of the L-shaped support, the position of the moving roller is adjusted by the sliding bar driven by the air cylinder, the distance between the cable and the deck of the ship is accurately controlled, the heavy object is prevented from swinging, tilting and rubbing against the deck or equipment during slow descent, meanwhile, under the linkage operation of the cleaning assembly and the lubricating assembly, the problems of incomplete cleaning and uneven lubrication in the traditional vertical path are solved, the equipment failure rate is reduced, and when the cable is cleaned, impurities and excess lubricating medium will not fall onto the surface of the equipment.

A ventilation device according to an embodiment of the present invention is equipped with a differential pressure sensor that detects a pressure difference between an inlet and an outlet of a HEPA filter, and an inlet-side sensing path and an outlet-side sensing path connected to the differential pressure sensor are formed. The inlet-side sensing path includes an inlet-side vertical path through which inlet-side air of the HEPA filter flows in, and a plurality of inlet-side horizontal paths connected to the inlet-side vertical path, and the outlet-side sensing path includes an outlet-side vertical path through which outlet-side air of the HEPA filter flows in, and a plurality of outlet-side horizontal paths connected to the outlet-side vertical path. The plurality of inlet-side horizontal paths and the plurality of outlet-side horizontal paths are spaced apart from each other in the vertical direction along the length of the HEPA filter.

A central air conditioning control method, system, device and medium of a large complex, wherein the method comprises: obtaining a central court heat source area, a first refrigeration area and a second refrigeration area; determining a heat propagation path of the large complex based on internal space characteristics, heat source parameters, first temperature data and third temperature data, the heat propagation path comprising a vertical path and a horizontal path; determining a direct influence area and an indirect influence area of the heat source in the first refrigeration area; and calculating a first heat disturbance diffusion index and a second heat disturbance diffusion index based on the internal space characteristics, temperature change characteristics, heat source parameters and environmental influence factors respectively; determining a first regional temperature compensation coefficient based on the first heat disturbance diffusion index, determining a second regional temperature compensation coefficient based on the second heat disturbance diffusion index, and generating an air conditioning control scheme according to the first regional temperature compensation coefficient and the second regional temperature compensation coefficient. The application can improve the operation control efficiency of the air conditioning system in the large complex.

Disclosed are methods and systems for facilitating takeoff and landing of an aircraft. For instance, the method may include obtaining aircraft information and retrieving vertiport information for a desired landing or takeoff location area. The method may further include determining an aircraft path including a vertical path portion and a cruise path portion; determining a dynamic switchover point between the vertical path portion and the cruise path portion along the aircraft path; and transmitting control information including a vertical control portion and a cruise control portion to aircraft propulsion systems. Wherein the aircraft propulsion systems will operate under one of the vertical control portion or the cruise control portion until the aircraft reaches the dynamic switchover point, and wherein the aircraft propulsion systems will operate under the other of the vertical control portion or the cruise control portion after the aircraft reaches the dynamic switchover point.

The invention discloses a positioning and welding device for desk frame supporting legs, and belongs to the technical field of welding. Comprising a positioning welding unit and a welding clamp unit, a pressing plate is strictly restrained to reciprocate along a vertical path through a precise sliding pair formed by a guide sleeve and a guide column, it is ensured that pressing force completely and vertically acts on supporting legs, interference of component force in the horizontal direction on a workpiece is completely eliminated, and the supporting legs placed on a supporting leg positioning seat are prevented from transversely sliding; according to the pressing mechanism, the toggle type lever principle is adopted, a worker holds a connecting rod by hand to conduct simple upward pulling or downward pressing action, then a pressing rod and a pressing plate can be driven to complete rapid lifting, single-hand rapid assembling and disassembling of one-hand releasing and one-hand pressing are achieved, and the clamping time is greatly shortened; when the handle is pressed downwards to cross a dead point position, the mechanism forms reliable mechanical self-locking, even if the handheld part is loosened, the pressing plate can still keep constant pressing force, and an operator can carry out welding operation without continuously applying force.

The invention discloses a VNAV vertical deviation calculation method satisfying vertical side cutting, and the method comprises the steps: obtaining the position of an aircraft, the position of each waypoint of a flight plan, horizontal path data, vertical path data, the ground speed of the aircraft, and the air pressure altitude of the aircraft, and calculating the distance between the aircraft and the end point of the flight plan, and the vertical path segment of the aircraft; the method comprises the following steps: determining whether an aircraft is in a vertical path transition section, and when the aircraft is in the vertical path transition section, calculating a virtual vertical path transition path constructed at a constant vertical acceleration, and calculating the vertical deviation based on the path, so as to achieve the purpose of VNAV vertical deviation calculation meeting vertical side cutting. According to the method, engineering implementation is easy, the guiding target of the VNAV can be optimized into a vertical bypass path with the constant vertical acceleration in the vertical path transition section under the condition that the calculation load is small, and the flight quality and the comfort level of passengers are guaranteed while the vertical path is accurately tracked.

This invention relates to the field of laser technology and discloses a vertical-cavity surface-emitting laser and its fabrication method. The fabrication method includes: providing a substrate layer; sequentially stacking a first mirror layer, a first confinement layer, an active layer, and a second confinement layer on the substrate layer; forming a ring-shaped nitride barrier layer on a portion of the surface of the second confinement layer, with a first aperture formed in the central region; forming a second mirror layer on the nitride barrier layer, the second mirror layer filling the first aperture and forming a second aperture corresponding to the first aperture on a side opposite to the nitride barrier layer; the work function of the nitride barrier layer is higher than that of the second confinement layer and the second mirror layer, so that the nitride barrier layer forms a first Schottky barrier and a second Schottky barrier. In this invention, the nitride barrier layer blocks the lateral path with an interface energy barrier and widens the vertical path with a geometric structure, forcing vertical current transmission, while also possessing high thermal conductivity, significantly improving reliability at high power.

The invention relates to the technical field of lasers, and discloses a vertical cavity surface emitting laser and a preparation method thereof. The preparation method comprises: providing a substrate layer; sequentially stacking a first reflector layer, a first limiting layer, an active layer and a second limiting layer on the substrate layer; forming an annular nitriding barrier layer on a part of the surface of the second limiting layer, and forming a first unthreaded hole in the middle area; forming a second reflector layer on the nitridation barrier layer, wherein the first light hole is filled with the second reflector layer, and a second light hole corresponding to the first light hole is formed in the side, away from the nitridation barrier layer, of the second reflector layer; and the work function of the nitridation barrier layer is higher than that of the second limiting layer and the second reflecting mirror layer, so that the nitridation barrier layer forms a first Schottky barrier and a second Schottky barrier. According to the invention, the nitridation barrier layer blocks a transverse path by using an interface energy barrier, broadens a vertical path by using a geometric structure, forces current vertical transmission, has the advantage of high thermal conductivity, and greatly improves the reliability under high power.

This invention discloses a side-mounted 3D printing system and method for thin metal sheets. The system includes a cutting laser, a printing laser, a gas circulation component, a feeding component, a printing platform, and a printing control component. The feeding component is specifically designed to include an upper feeding roller and a lower receiving roller, both arranged vertically. The thin metal sheet is tightly wound between these two rollers and fed and retrieved along a vertical path. The cutting laser and the printing laser are positioned on the same side of the metal sheet printing surface, while the printing platform is located on the other side. By arranging the feeding and receiving rollers vertically, the thin metal sheet is continuously transported and retrieved vertically. This invention utilizes gravity to effectively prevent molten metal droplets generated by laser melting from splashing onto the workpiece surface during printing, thereby significantly improving print quality, and is particularly suitable for printing large-format (ultra-meter) workpieces.

The invention relates to an unconfined compressive strength testing device and method for a 3D printing concrete wet blank, and belongs to the technical field of concrete compression tests. The device comprises a hollow cylindrical mold building cylinder and a hollow cylindrical positioning cylinder; at least two vertical track keys are arranged on the outer wall of the mold building cylinder, and two grippers are symmetrically arranged at the top of the outer wall of the mold building cylinder; and the positioning cylinder is sleeved outside the mold building cylinder, the inner wall of the positioning cylinder is provided with a track groove matched with the track key, and the positioning cylinder and the track key are in sliding fit to form a guide track system to ensure that the mold building cylinder moves along a strict vertical path during demolding. The lower end of the positioning cylinder extends outwards to form at least three positioning legs with positioning scales, and the positioning legs are used for being matched with centering marks on a lower loading plate of the press machine, so that the whole device is accurately positioned in the center of the loading plate. The whole process greatly reduces manual operation errors and subjective judgment, so that the test result is more accurate, the repeatability is higher, and standardized popularization is facilitated.

The utility model discloses an HIV (human immunodeficiency virus) self-test saliva detection box which comprises a detection box body, the upper end of the detection box body is provided with a developing area and a sample hole, the end face and the side wall of the detection box body are respectively provided with two groups of positioning grooves and fixing grooves, the positioning grooves and the fixing grooves are mutually symmetrical in position, and a positioning plate is clamped in the two groups of fixing grooves together. The outer wall of the positioning plate is in a U shape, a positioning hole is formed in the center point of the positioning plate in a penetrating mode, the U-shaped inner wall of the positioning plate makes contact with the end faces of the two positioning blocks, and a fixing device for fixing the positioning plate is installed on the side wall of the detection box body. By arranging the positioning plate and the positioning hole, a saliva sample can accurately enter the central area of the sample hole along a vertical path, so that the sample is prevented from being diffused or dropped to the surrounding area due to dropping position deviation, the accuracy of a detection result is improved, the operation error rate is reduced, and the detection efficiency is improved. And the anxiety emotion caused by tension or unskilled feeling of the user is relieved.

The application provides a time comparison method and device, electronic equipment and storage medium, and relates to the technical field of satellite navigation and timing. The method comprises the following steps: extracting the observation value of the total delay of the oblique path of the RDSS signal by using the fixed elevation penetration path of the RDSS signal; decomposing the theoretical value of the total delay of the oblique path of the RDSS signal into a zenith delay variable and a horizontal gradient variable; minimizing the difference between the theoretical value and each observation value to obtain the optimal solution of the tropospheric vertical path delay in the zenith direction and the optimal solution of the horizontal gradient vector, and constructing the target constraint function of the tropospheric delay in the double-difference carrier phase observation equation of the RNSS signal; calculating the estimated value of the double-difference phase ambiguity based on the double-difference carrier phase observation equation and the target constraint function, and calculating the time bias based on the estimated value of the double-difference phase ambiguity. The application can not only maintain the high precision close to the TWSTFT method, but also has the advantages of low cost and high availability of the GNSS PPP method.

Gate (1) with a gate leaf (8) that can be vertically adjusted in its relative position, wherein at the lower end of the gate leaf (8) an end of a transmission element (16) engages on each side, the transmission elements (16) extend within a frame or mounting profiles (19) of the gate (1) to respective upper transmission wheels (17), the transmission wheels (17) being part of a drive train with a connecting drive shaft (6), wherein a drive unit (3) for the gate leaf (8) engages on at least one side of the drive shaft (6), wherein the gate leaf (8) consists of sectioned elements that are rotatably connected to one another and are guided by means of rollers (21) in approximately vertical, lateral guides (2), wherein the lateral guides (2) transition on the upper side into spiral sections with spirally extending guide tracks (11), characterized in thatthat such a guide track (11) is embedded within a circuit board-like guide plate (4), wherein a transmission track (10) for the transmission element (16) runs approximately parallel to the guide track (11) in the circuit board-like guide plate (4), the transmission element (16) emerging from the approximately vertical path is guided into the transmission track (10) via a transmission wheel (17) mounted in the circuit board-like guide plate (4).

The utility model relates to the technical field of wood processing, and provides a wood pressing device which comprises mounting frames arranged in pairs, transverse parts arranged at the tops of the mounting frames, and longitudinal parts arranged at the bottoms of the mounting frames. The material pressing box is arranged at the bottom of the transverse part of the mounting frame; the force application point of the pressurizing assembly is arranged in the middle of the material pressing box, so that pressure is intensively transmitted to the center area of wood in the vertical direction, and the problems of material pressing box deviation and uneven pressure distribution caused by asymmetric force application are solved; and secondly, an inclined plane attaching structure and an adjustable clamping mechanism in the guide assembly are adopted, it is ensured that the material pressing box always moves along a vertical path, and the technical defects that a traditional lateral guide mode is prone to abrasion and low in precision are overcome.

The utility model provides a novel water body oxygenation and aeration device, which belongs to the technical field of oxygenation and aeration and comprises a base, a fixed column is arranged on the base, an aerator is mounted at the top of the fixed column, a sliding sleeve is slidably arranged on the fixed column, a connecting mechanism is rotatably arranged on the sliding sleeve, a bearing part is arranged at the bottom of the fixed column, and the connecting mechanism is rotatably arranged on the bearing part. A communicating sleeve is rotationally arranged on the peripheral side of the bearing part, a plurality of air outlet blade plates are arranged on the communicating sleeve, and the air outlet blade plates are connected with the sliding sleeve through a connecting mechanism. The aeration device solves the problems that when an existing aeration device is used, bubbles can only rise according to a vertical path, the overall rising path is short, the dissolved oxygen degree of a water body is not high, meanwhile, the horizontal diffusion capacity is weak, the oxygenation area is limited, equipment needs to be densely arranged, the cost is high, and the practicability is not high.

A hanger assembly includes a housing, a slide assembly, and a hook. The housing includes two side walls arranged in parallel, wherein a first vertical path is defined between the two side walls. The slide assembly is movably connected to the two side walls, and is configured to move relative to the housing along the first vertical path. The slide assembly further includes a slide rail defining a second vertical path. The hook is movably connected to the slide rail and is configured to move relative to the slide assembly along the second vertical path.

This utility model provides an intelligent vertical transmission mechanism for conveying materials, including a belt motor, a reducer, a closed-loop synchronous belt, a toothed pressure block, a toothed fork platform, a guide rail, a limit sensor, and a tensioning device. The belt motor is mounted on the bottom base of the rotary drive feeding mechanism via a fixed bracket. The reducer is mechanically connected to adjust the power. The closed-loop synchronous belt surrounds the output wheel and the upper fixed wheel to form a vertical path. The toothed pressure block, made of high-strength wear-resistant material, is fixed to the side of the toothed fork platform with screws, and engages with the toothed grooves of the synchronous belt for transmission. The toothed fork platform slides along the guide rail, which helps prevent deviation. The limit sensor detects the lifting stroke, and the tensioning device adjusts the tension with an adjusting screw. The components are integrated into the rotary drive mechanism, and the toothed fork platform is connected to the rotary platform to achieve synchronous movement. This utility model avoids damage to the synchronous belt through the toothed pressure block, improves efficiency by combining an anti-slip coating and a low-friction coating, and uses a gripping mechanism to position the material tray. It overcomes the problems of low efficiency, insufficient accuracy, and complex maintenance of traditional transmission methods, making it suitable for automatic processing of electronic material trays.

This invention discloses an automatic routing method for EDA circuit schematic display, including step S1: obtaining the connection relationships and coordinate sets of components, and dividing the components into hierarchical channels; step S2: sorting the connection relationships and coordinate sets, finding the two furthest points to determine the horizontal path of the bus, classifying the coordinate points to determine the vertical range of the bus, identifying non-conflicting tracks as vertical paths, and combining the horizontal and vertical paths to determine the bus path; step S3: determining the branch path from the bus to each pin based on the horizontal coordinate of the vertical path in the hierarchical channel and the coordinates of each pin; step S4: obtaining the vertical range of the hierarchical channel, comparing it with the vertical range of the bus, determining the vertical path of the branch line, integrating the horizontal path and the branch path to each pin, and determining the overall path of the branch line. Compared with the prior art, this invention optimizes the utilization space of the channels, reduces intersections, standardizes the routing sequence, and makes the routing more compact and aesthetically pleasing.

The invention discloses a draw tower (100) comprising a top end zone (108) to insert a preform along with fluid and the preform is melted into an optical fiber (106) that exits from a bottom end zone (110). The draw tower (100) includes a plurality of air knives (112) distorting optical fiber path such that partially uncooled optical fiber deviates from a vertical path to a bended path wherein the plurality of air knives (112) is a plurality of openings arranged such that to cause distortion on the vertical path of the optical fiber (106) in the draw tower (100) and the plurality of openings is a combination of one or more of a suction and pumping of the fluid. Further, the bended path length is greater than a vertical path length and is defined by laminar flow for at least 70% of the bended path length.

A gripping device (102) of a depalletizing system (100) for depalletizing one or more units stacked in layers comprises of a belt drive mechanism (202). The belt drive mechanism (202) comprises of a belt (208), wherein at least a portion of the belt (208) defines a vertical path. The vertical path defined by the belt (208) is configured to be parallel to a pallet of one or more units that are to be depalletized. The belt (208) is provided with a plurality of teeth (210), wherein the plurality of teeth (210) provided on at least a portion of the belt (208) interface with the one or more units to lift the one or more units.

The invention relates to a semiconductor device, in particular to the technical field of chip packaging, and discloses a super-power flat no-lead power device packaging device which comprises a bonding pad substrate, a connecting part is arranged on the bonding pad substrate, an anti-seismic part is arranged on the connecting part, a semiconductor part is arranged on the anti-seismic part, and the semiconductor part is arranged on the anti-seismic part. The shock-resistant part is provided with a shock-resistant part, the semiconductor part is provided with a heat dissipation part, the heat dissipation part is provided with a packaging part, and the shock-resistant part, the semiconductor part, the heat dissipation part and the packaging part form one single-side packaging mechanism. The two single-side packaging mechanisms are both installed on the bonding pad substrate and are oppositely arranged in the vertical direction, the two single-side packaging mechanisms are arranged in a staggered mode, a copper column, conductive column and micro-boss integrated vertical path is adopted, through-silicon vias are matched with BGA solder balls for short-path butt joint, the interconnection length is greatly shortened, and the production efficiency is improved. The problem that traditional lead bonding and flip-chip bonding are high in parasitic parameters is solved, and the requirements for high-frequency and large-current transmission are met.

The invention provides a time comparison method and device, electronic equipment and a storage medium, and relates to the technical field of satellite navigation time service, and the method comprises the steps: extracting an observation value of the inclined path total delay of an RDSS signal through a fixed elevation penetration path of the RDSS signal; decomposing the theoretical value of the oblique path total delay of the RDSS signal into a zenith delay variable and a horizontal gradient variable; minimizing the difference between the theoretical value and each observation value to obtain an optimal solution of troposphere vertical path delay and an optimal solution of a horizontal gradient vector in the zenith direction, and constructing a target constraint function of troposphere delay in a double-difference carrier phase observation equation of the RNSS signal; and calculating an estimated value of the double-difference phase ambiguity based on the double-difference carrier phase observation equation and the target constraint function, and calculating the time deviation based on the estimated value of the double-difference phase ambiguity. According to the method, high precision close to that of a TWSTFT method can be kept, and the advantages of low cost and high availability of a GNSS PPP method can be achieved.

An adjustable screen hood assembly includes a screen hood housing, a reel-mounting bracket having a first vertical length and disposed within the screen hood housing, a screen hood bracket removably affixed to an end of the screen hood housing wherein the one screen hood bracket has a central aperture provided with a second vertical length greater than the first vertical length. The reel-mounting bracket is adjustably positioned within a perimeter of the central aperture and displaced along a bi-directional vertical travel path registered orthogonal (or substantially orthogonal) to a longitudinal length of the screen hood housing. The screen hood housing has a longitudinal axis angularly offset relative to a horizontal axis. The screen hood housing is configured to be continuously abutted against the existing sloped beam and oriented parallel thereto such that no gap exists between the underside of the existing sloped beam and the screen hood housing.

The application provides a height indication method and device for a vertical navigation display area of an airplane. Compared with a conventional height indication method for a vertical navigation display area of an airplane, the application provides a more refined indication method from the following aspects: a height indication scale band design, a flight height indication design, a flight vertical path, an airport, a waypoint and the like information graphic indication design, and the like. The application aims to solve the problem that the conventional height indication method for a vertical navigation display area of an airplane cannot meet the current display requirements of an airplane, so that a pilot can obtain more accurate current flight height and related reference height of a flight vertical path, an airport, a waypoint and the like information graphic indication and the like height information during flight, and improve the reliability and safety of flight.

The invention discloses a marine aquaculture platform lifting system which comprises a work platform end face, traction execution modules are arranged at the four corners of the work platform end face, and traction limiting guide rails, transmission end connecting units and opposite limiting supporting columns are arranged on the inner sides of the traction execution modules. The traction limiting guide rail is used for conducting sliding limiting on the traction execution module during vertical lifting, the platform supporting module is connected to a breeding platform, and the transmission end connecting unit is connected to a platform traction end and used for providing transmission force during vertical lifting of the traction execution module; a rigid rail is formed through symmetrical arrangement of traction limiting guide rails and opposite limiting supporting columns, embedding guide cavities which are strictly embedded with the supporting columns are formed in the two sides of a directional roller transmission part, the directional roller transmission part is forcibly limited to only slide in the vertical direction, the degree of freedom in the horizontal direction is greatly limited, and it is ensured that the lifting process is strictly conducted along the vertical path; shaking and deviation are reduced, and the overall stability after lifting debugging is improved.

The invention discloses a laser cutting device for pole piece cutting, and relates to the technical field of pole lug machining equipment. Comprising a cutting cavity provided with a cutting station; the conveying assembly is used for conveying the pole piece to be processed to a cutting station; the laser cutting assembly is arranged on one side of the cutting cavity and used for cutting the pole piece located at the cutting station; the at least one air supplementing opening is formed in the top of the cutting cavity and used for balancing air pressure inside and outside the cutting cavity so as to prevent the pole piece from deforming due to air pressure difference in the conveying process; and the waste belt conveying module is arranged below the cutting cavity and used for conveying the formed waste belt in a negative pressure adsorption mode after the pole piece is cut, and the vertical conveying structure is used for enabling the waste belt to move along a vertical path so as to isolate mechanical vibration generated by conveying the waste belt from being transmitted to a cutting station. The air pressure in a cutting cavity is effectively balanced, and mechanical vibration generated by waste belt conveying is isolated.

A hanging device includes an accommodation main body, a sliding assembly, a hook, and the accommodation main body that includes two parallel sidewalls, in which a first vertical path is defined between the two sidewalls. The sliding assembly is movably connected between the two sidewalls to move relative to the main body along the first vertical path. The sliding assembly further includes a sliding rail which defines a second vertical path, and the hook is movably connected to the sliding rail to move relative to the sliding assembly along the second vertical path.