97 results about "Home lift" patented technology

The invention disclosed herein is a novel Home Lift Position and Rehabilitation (HLPR) apparatus designed to provide stable movement along several critical axes of motion including lift capability. The HLPR apparatus is capable of moving along a desired floor path (“x-axis”), moving on a vertical axis to lift a patient (“z-axis”), rotating the HLPR apparatus itself (along an “outer rotational axis”), and rotating a patient within the HLPR apparatus while the HLPR apparatus itself remains stationary (along an “inner rotational axis”). The telescoping, double-nested C-frame structure of the HLPR apparatus and pivot assembly allow any patient support structure known in the art to be suspended securely and to move in a stable, torque-resistant manner to assist patients in rehabilitation and in independently performing activities of daily living.

The invention discloses a knapsack type elevator cage frame and a home elevator. The knapsack type elevator cage frame comprises a cage (7), and a bracket (3), a straight girder (1), a lower girder (2), a top girder (4), sound insulation shock pads (5), a cage platform (6), and a cage top (8) which are used for supporting the elevator cage (7), and a diagonal member (10) used for adjusting the cage (7); four shock pad supports (16) are fixed between the bracket (3) and the cage platform (6) arranged on the elevator cage (7); each shock pad support (16) is provided with the sound insulation shock pad (5); the upper end of the straight girder (1) is provided with the top girder (4) and simultaneously the upper surface of the upper girder (4) is lower than the cage top (8); and the cage top (8) is provided with four cage top draw bars (9). The home elevator comprises the knapsack type elevator cage frame. The height of a top is reduced; shock pads and rubber pads are arranged so that the running comfort degree of the cage is improved; the friction noise of a guide shoe sliding block is reduced; and the knapsack type elevator cage frame and the home elevator have a scientific design and a compact structure and are ideal.

An elevator with an airbag protector comprises the airbag protector. The airbag protector comprises a safety airbag and speed measurement encoders; the safety airbag is fixed on the outer surface of the bottom of the car; the safety airbag is electrically connected with a safety airbag trigger device; the speed measurement encoders are arranged on the top of the car or columns; the output end of every speed measurement encoder is connected with a safety airbag trigger controller which is electrically connected with the safety airbag trigger device; the speed measurement encoders are movably connected with a main frame. The speed measurement encoders each having a roller measures the speed when rolling up and down within the main frame; the safety airbag protects the elevator; the elevator is simple in structure and convenient to mount. After inflated, the safety airbag has the effect of absorbing impact force so that the car lands stably and generates no direct impact to passengers inside. The elevator is available as various elevators, especially home elevators.

The invention discloses a flexible safety gear linkage mechanism for a home elevator. Left and right safety gears with gear bodies and lifting rods are arranged on left and right vertical beams of a cage respectively, and are linked through a linkage rod, wherein the lifting rods are linked with cranks to form a universal linkage mechanism through a linkage shaft; the linkage rod is provided with left and right pull rods; one end of the left pull rod is connected with the left crank linked with the lifting rod of the left safety gear, and the other end of the left pull rod is connected with a turnbuckle; one end of the right pull rod is connected with the right crank linked with the lifting rod of the right safety gear, and the other end of the right pull rod is connected with the left pull rod through the turnbuckle. The linkage mechanism has the advantages that the linkage mechanism is flexible and reliable in structure and higher in safety; the linkage mechanism is simple in design and high in practicability; the linkage mechanism is convenient to operate, and gaps between the safety gears and guide rails are relatively easy to regulate; the linkage mechanism is smaller in size and applicable to the home elevator; the linkage mechanism can be regulated leftwards and rightwards, and is difficult to lock.

The invention discloses a small home elevator which comprises a frame, a lift car arranged in the frame, a drive system for driving the lift car to move, a counter-weight system, and guide rails arranged on two sides of an inner wall of the frame. The frame comprises stand columns and cross rails; the four stand columns are vertically arranged on the bottom part of the frame so as to form a rectangular shape and are made of alloy section bars; each alloy section bar is formed by a first installation plate and a second installation plate perpendicular to each other; and the first installation plates and the second installation plates comprise clamping grooves located on the outermost side end surfaces, installation grooves located in the middles of the inner side surfaces, and connecting holes located inside. According to the small home elevator provided by the invention, no protruded part is arranged on one outward side of each stand column, so that the appearance is more attractive, and the occupation in space is reduced; and the stand columns are only inwards provided with the installation grooves, so that on the basis of ensuring the structural strength, the sizes of the installation plates of the whole stand columns can be smaller and thinner, and the small home elevator has remarkable advantages in the field of home elevators.

The invention relates to a domestic machine-room-less lift and belongs to the field of lift control systems. The domestic machine-room-less lift comprises a shaftway, a lift car, a driving device, an emergency rescue device, a control device and a rescue device, wherein the driving device is used for driving the lift car to ascend and descend and is arranged in the top layer space of the shaftway; the emergency rescue device is used for detecting on and off of mains supply, transmitting a mains supply jump-off signal and switching power supply into battery output; the control device is used for receiving the signal of the emergency rescue device and controlling the lift to reach the near flat layer at the inspection speed and is arranged on the outer wall of the top layer of the shaftway; and the rescue device is used for performing self saving in emergency and releasing people and is arranged outside the shaftway. By adoption of the domestic machine-room-less lift, after people are trapped in the lift, the maintenance personnel can perform rescue without entering a machine room.

The invention relates to a household elevator control system. The household elevator control system comprises a remote server, a central processing module, a wireless communication module, an elevator communication control system, a double thread screw drive system, a sliding way, a modular well and a lifting platform. The central processing module is connected with the remote server through the wireless communication module. The double thread screw drive system drives the lifting platform to move up and down in the well along the sliding way. Wireless 4G communication and household elevator drive control are organically combined, the control system is more reliable, the automation degree of a household elevator is greatly improved, elevator running related information is transmitted to an upper computer through 4G mobile wireless communication, and the upper computer constantly monitors the running state of the elevator of clients for 24 hours. Functions of telecommand, remote regulation, remote control and machine locking are achieved, and the elevator running safety information and running information are wirelessly transmitted to the upper computer through the 4G communication system.

The invention relates to a home elevator and a car frame thereof. The car frame comprises two vertical columns, the lower end of one vertical column is directly connected with a left holding beam which extends front and back, the lower end of the other vertical column is directly connected with a right holding beam which extends front and back, and only a front cross beam, a diversion sheave beam and a back cross beam which are sequentially arranged from front to back are connected between the left holding beam and the right holding beam in a bridge connection mode. The included angles between the diversion sheave beam and the left holding beam as well as between the diversion sheave beam and the right holding beam are 15-30 degrees, and diversion sheaves capable of leading a steel wire rope from the lower positions of the diversion sheaves are arranged on the diversion sheave beam. The front cross beam and the back cross beam are perpendicularly connected at the end portions of the left holding beam and the right holding beam correspondingly, and the front cross beam and the back cross beam are connected with each other only through the left holding beam and the right holding beam. An original lower beam is omitted, an integral holding frame composed of the left holding beam, the right holding beam, the front cross beam, the diversion sheave beam and the back cross beam directly supports an elevator car, therefore the structure of the car frame is simplified, and the compactness of the car frame is improved.

A folding type manual telescopic car door serves as a household lift car door. Guide devices are arranged at the upper side and the lower side of an inlet and outlet of a lift car, wherein strip-shaped aluminum alloy or stainless steel material sheets are made into leaves, a shutter folding door is formed by connecting the leaves through couplers, hollow-out safe glass is embedded into the shutter folding door, sliding wheels are at least arranged at the upper end and the lower end of the shutter folding door, the sliding wheels are matched with the upper guide device fixed to a door header and the lower guide device fixed to a bed table, the sliding wheels slide along the guide devices, one end of the shutter folding door is fixed to a side wall plate of the lift car through fixing bolts, the other side of the shutter folding door is provided with a handle favorable for closing the door and an electrical contact switch confirming that the door is closed in place, when the door is closed in place, a safety circuit of a lift is connected, and the lift can be operated. The folding type manual telescopic car door avoids the danger of shearing and extruding in operation of the lift car and is simple in structure, attractive in appearance, convenient to operate, safe, reliable, low in fault rate and capable of sufficiently saving space.

The invention discloses a novel backpack-optimized home elevator, which comprises a pair of support frames fixed on a base surface; a pair of channel steels, each channel steel connected to one of the pair of support frames; a pair of main rails , each of which is respectively arranged on the same side of one of the channel steels; an L-shaped car frame, on which the car is fixed, and the main guide rail is located on the same side of the car; traction machine. Beneficial effects: 1. The steel belt is in the shape of a flat strip, which is formed by wrapping high-strength polyurethane material on the outer layer of the steel wire rope. The new backpack-optimized home elevator disclosed by the present invention has a longer service life, energy saving and environmental protection, and can simplify the installation project of the elevator and reduce noise , Increase the comfort of elevator operation.

The invention discloses a mechanical stopping device for a home elevator. The mechanical stopping device for the home elevator comprises a fixed plate, an in-situ switch, a working switch and a transverse guiding part are arranged on the fixed plate, a sliding sinker bar is arranged in the transverse guiding part and fixedly provided with a sinker bow, and a part of the sinker bow is positioned between the in-situ switch and the working switch and used for being matched with the in-situ switch and the working switch. According to the mechanical stopping device, the sliding sinker bar and the transverse guiding part are matched to form a withdrawal structure, so that the whole stopping device is small in volume, compact in structure, and small in occupied space in installation, and has enough safety.

The invention provides a home lift roller guide shoe and a lift car. The roller guide shoe comprises a straight girder, a left guide shoe body, a right guide shoe body, a front guide shoe set and a rear guide shoe set. The left guide shoe body and the right guide shoe body are fixedly arranged at the upper end and the lower end of the straight girder correspondingly. The front guide shoe set and the rear guide shoe set are arranged at the upper end and the lower end of the straight girder correspondingly. First guide wheels are arranged on the left guide shoe body and the right guide shoe bodyin the direction perpendicular to the straight girder mounting face. Second guide wheels are arranged on the front guide shoe set and the rear guide shoe set along the side edges of the straight girder correspondingly. By adopting the technical scheme, the home lift pit mounting depth can be effectively decreased, meanwhile, the lift car top layer height can be lowered, and thus the adaptabilityof a lift is greatly improved; and through the scheme provided by the invention, the noise of the lift car can be lowered, and the safety performance of the lift is improved.

The invention discloses a domestic machine-room-less elevator rescue cabinet and belongs to the field of machine-room-less elevator rescue. The domestic machine-room-less elevator rescue cabinet comprises a monitoring module, a communication module, a protective module and a control module, wherein the monitoring module is a monitoring display terminal arranged on the rescue cabinet; the protective module comprises a leakage protection circuit breaker arranged on the rescue cabinet; and the control module comprises a stop switch and a door open button which are arranged on the rescue cabinet and are used for control and stop operation of the elevator. When the rescue cabinet is used in the rescue process, the elevator operates at low speed, so the personal safety of the rescued people is guaranteed.

The invention discloses a remote self-rescue system for someone trapped in a household elevator, and relates to the technical field of elevators. According to the technical scheme adopted by the invention, the key point is that the remote self-rescue system comprises the elevator and an elevator protective circuit, wherein the protective circuit comprises a safety detecting module and a brake control module, and further comprises an elevator control end; the elevator control end comprises a detecting module and an elevator performing module; the detecting module is used for detecting a fault signal of the elevator protective circuit in real time, detecting the fault signal of the elevator protective circuit, and emitting the fault signal to the brake control module while emitting a performing signal to the elevator performing module, and the brake control module brakes the elevator; and after receiving the performing signal emitted by the detecting module, the performing module emits arescue signal to the elevator protective circuit. In a using process of the household elevator, a phenomenon of trapping someone due to faults of a safety circuit system is generated; and the intelligent control system realizes self-rescue, and has the effects of a high safety coefficient, strong operation reliability and short recue time.

The invention discloses an ultra-shallow pit and short top layer steel belt traction household elevator, and relates to the technical field of household elevators. The ultra-shallow bottom pit and short top layer steel belt traction household elevator comprises a hoistway and a bottom pit formed in the bottom of the hoistway. Lift car guide rail supports are fixedly arranged on the two sides of the hoistway correspondingly, lift car guide rails are arranged on the two lift car guide rail supports correspondingly, and the lift car guide rails are fixedly arranged on the two sides of the lift car frame correspondingly; a car top wheel is arranged at the top of the car frame, a car transition wheel beam and a car rope head fixing frame are arranged at the tops of the two rows of car guide rails, and a car rope head combination is arranged on the car transition wheel beam and the car rope head fixing frame. The elevator further comprises a lift car transition wheel and a wheel beam. The problems that in the prior art, a home elevator is dragged through a steel wire rope, and when the pit depth and the top layer height do not meet the standard requirement, due to the fact that a car bottom wheel or a car top wheel occupies a large space, and the selected steel wire rope is not suitable are solved.

An improved home lift having a simplified design and utilizing components that is simple and economical to install and designed for economical, temporary rental or lease installations as well as permanent installations. Complete installations cost far less than any existing home lift of the prior art and most stair climbers. The components include an optional steel tower frame or a support post and beam assembly, a carriage designed to carry a passenger with or without a wheelchair, a counterweight, and a set of pulleys configured to guide two cables. Both cables are attached to the carriage and the counterweight. The load weight and the counterweight are equal and balanced, requiring so little-force that the home lift may easily be operated manually by the passenger or an aide.

The invention discloses a hoistway-free backpack type double-chain household elevator. The hoistway-free backpack type double-chain household elevator comprises supporting guide rods, a mounting frameis fixedly connected to the tops of the supporting guide rods, a servo motor and a speed reducer are fixedly connected to the top of the mounting frame, a chain wheel is rotationally connected to thetop of the mounting frame, and a lift car fixing frame is slidably connected between the two supporting guide rods; a chain is arranged on the surface of the chain wheel, one end of the chain is fixedly connected with the lift car fixing frame, a supporting seat is fixedly connected between the two supporting guide rods, a rotating wheel is arranged at the top of the supporting seat, steel wire ropes are fixedly connected to the two sides of the top of the lift car fixing frame, one end of each steel wire ropes bypass the surface of the rotating wheel and is fixedly connected with a balancingweight, the other end of the chain is fixedly connected with the balancing weight, and one side of the lift car fixing frame is fixedly connected with a lift car. The hoistway-free backpack type double-chain household elevator belongs to the technical field of household elevators, the problems that an existing elevator is complex in structure and limited in installation condition are solved, andthe requirements of small-space residents are met.

The invention provides an aluminum alloy or steel shaft positive drive three-opening home elevator which comprises a shaft, a car guide rail, a car, a back frame, a positive drive main engine, a steelwire rope and a speed reducer, wherein the car guide rail is arranged on the shaft, the car is arrange din the shaft, the back frame is connected with one surface of the car, the positive drive mainengine is arranged at the top of the shaft, the steel wire rope is connected with the car and the positive drive main engine, the speed reducer is connected with the steel wire rope, and hand slidingdoors are arranged on the other three surfaces of the car. The shaft is made of alloy profiles or steel materials and conveniently customized, the size of the shaft can be set according to requirements, the back frame is connected with the steel wire rope to drive the car to rise and fall along the car guide rail, a counter-weight system is omitted, the elevator is more simple and stable in structure and convenient to commission, and more space is saved.

The invention discloses a home lift. The home lift comprises a lifting track, a car and a control panel, the lifting track is arranged to be of a square structure, a support is arranged at the bottom of the lifting track, and the lifting track is perpendicularly fixed to the ground through bolts; two guide rails are arranged on the outer side wall of the lifting track; the car is arranged to be of a U-type structure, the control panel is arranged on the inner side wall of the car, the outer side wall of the car is connected into the two guide rails through two rows of rotating wheels in a clamped mode, and a hydraulic motor is arranged in the lifting track and used for lifting the car. The home lift is compact in structure, easy to operate and convenient to maintain; the home lift has the greatest advantages that original civil engineering does not need to be changed, no pits, wells or machine rooms are needed, no noise is generated, site limitation is avoided, and the home lift is suitable for a site where ramps and elevators are not suitable for being manufactured.

The invention relates to a control cabinet of a household elevator without a machine room, and belongs to the field of control of elevators without machine rooms. The control cabinet comprises a power supply module, a driving module, a control module and a safety loop module, wherein the driving module is connected with the power supply module and used for enabling the elevator to ascend and descend, the control module is connected with both the power supply module and the driving module and used for enabling the driving module to control the elevator to ascend or descend to a corresponding position, and the safety loop module is connected with both the power supply module and the control module and used for acquiring state information of all safety switches and feeding the information to the control module. The control cabinet of the household elevator without the machine room is mounted on an exterior wall of a top floor, electromagnetic interference of a system is reduced, influences to an outdoor decoration effect of an elevator hall are reduced, requirements of the elevator on debugging, rescue, safety and the like are met, and the control cabinet of the household elevator without the machine room is light and handy in structure, convenient to install and simple in operation.

The invention discloses a split type household lift control system and a household lift and relates to the technical field of lift control. The split type household lift control system comprises a main control cabinet and a main overhauling box. The main control cabinet is used for being connected with a car and a traction main machine of the household lift in a wired manner so as to control the traction main machine to drive the car to move in a shaft. The main overhauling box is connected with the main control cabinet in a wired manner, so that the main control cabinet is controlled throughthe main overhauling box, and then debugging operation and maintenance operation can be conducted on the split type household lift control system. The split type household lift control system and thehousehold lift have the feature that installation is convenient.

The invention relates to the technical field of elevators, in particular to a household elevator with an automatic telescopic toe guard. The household elevator with the automatic telescopic toe guardcomprises a front positioning plate and a rear positioning plate which are arranged at the bottom of a lift car, side plates located on the two sides of the bottom of the lift car are arranged betweenthe front positioning plate and the rear positioning plate, a buffer plate is rotationally connected to the side plates through positioning shafts, a buffer shell with a second air cavity is arrangedon the side, close to the buffer plate, of the rear positioning plate, a second piston is slidably connected into the second air cavity, a buffer rod used for driving the second piston to move is arranged on the buffer plate, a first air cavity is formed in the buffer plate, a first piston is slidably connected into the first air cavity, the first piston is connected with a telescopic plate extending to the position below the buffer plate, and the first air cavity and the second air cavity are connected through an air guide pipe. According to the household elevator with the automatic telescopic toe guard, the toe guard is telescopic and suitable for shallow shaft pits, and when a passenger kicks on the toe guard by stretching the foot accidentally, great pain cannot be caused.

The embodiment of the invention discloses an elevator personnel detection method and a related device. Whether people exist in an elevator car or not can be rapidly determined in a low-cost and home elevator scene. The elevator personnel detection method provided by the embodiment of the invention comprises the following steps of: recording a breaking current when a home elevator is in a no-load state; when the home elevator is closed and runs, obtaining a current breaking current of the home elevator; judging whether the current breaking current is within a preset range of the breaking current or not; if the current breaking current is within the preset range of the breaking current, determining that no person exists in the elevator car of the home elevator; and if the current breaking current is not within the preset range of the breaking current, determining that people exist in the elevator car of the home elevator.

The invention discloses a hoistway double chain home elevator. The hoistway double chain home elevator comprises supporting uprights; an equipment mounting frame is fixedly connected to the tops of the supporting uprights; a servo motor and a speed reducer are fixedly connected to the top of the equipment mounting frame; a first wheel set mechanism and a second wheel set mechanism are also arranged at the top of the equipment mounting frame; a car is arranged in a space surrounded by four supporting uprights; chains are arranged on the surface of the first wheel set mechanism and the surface of the second wheel set mechanism; counterweight blocks are fixedly connected to one ends of the chains; the other ends of the chains are fixedly connected to the top of the car; the supporting uprights comprise rectangular tubes; and fixing protective rings are fixedly connected to one ends of the rectangular tubes. The invention relates to the technical field of home elevators. The hoistway double chain home elevator has the advantages that problems of complicated structure and limited mounting condition of a traditional elevator with a traction wheel are solved, the stability is high, the safety is good, the applicability is high, the structure is simple and the mounting is convenient.

The invention discloses a main machine lifting device for an elevator. The main machine lifting device is provided with a lifting mechanism for lifting a main machine of an elevator and a bearing seat(1) for bearing the main machine of the elevator. In order to lift the main machine of the elevator to a designated installation position, the main machine lifting device is further provided with a bracket (2) for supporting the bearing seat (1), the bracket (2) is supported below the bearing seat, a lifting member (4) is arranged on the bracket (2), and the lifting mechanism applies lifting force to the lifting member (4), so that the main machine lifting device moves along guide rails of the elevator. In addition, the invention further relates to a domestic elevator.

The invention discloses a household elevator with a fire alarm function. The household elevator comprises an alarm box, a rectangular groove is formed in the side wall of the alarm box, a positioningplate is fixedly connected to the side wall of the rectangular groove, a trigger mechanism is arranged on the positioning plate, a moving groove is formed in the side wall of the alarm box, and a limiting rod is fixedly connected to the side wall of the moving groove. The limiting rod is slidably connected with a connecting rod, the connecting rod is provided with an abutting mechanism, baffles are fixedly connected to the side walls of the two sides of the rectangular groove, a fixed block is fixedly connected to the side wall of each baffle, and each fixed block is connected with a glass plate in a rotating mode. Through the old connecting rod, a pushing plate, a moving block and a connecting block, a triggering block can be driven to move to the outer side of the alarm box, the triggering block can be effectively protected at ordinary times and prevented from being accidentally touched by people, and when an alarm needs to be issued, the triggering block can be conveniently popped up, the alarm can be issued in time, and delay of reminding of other people and rescue of a fire disaster is avoided.

The invention discloses a high-safety strong-drive traction household elevator, and belongs to the field of household elevators. According to the high-safety strong-drive traction household elevator, a plurality of magnetic expansion rods and magnetic suction rods are arranged, when an elevator car shakes, the magnetic expansion rods can play a role in buffering, and the discomfort of people in the elevator car is reduced; when the elevator car shakes seriously, the magnetic expansion rods make contact with the inner wall of an elevator shaft, so that inner push magnetic sheets are sunken, outer expansion bags expand outwards, the sunken magnetic sheets are extruded out of strip seams, at the moment, the interiors of the multiple sunken magnetic sheets are extruded, the magnetism is enhanced, then the sunken magnetic sheets are mutually extruded and adsorbed, the multiple magnetic expansion rods are connected into a whole, the buffering part for shaking of the elevator car is changed into a plane from a point, the buffering effect is remarkably improved, and the potential safety hazards caused to people in the elevator car are effectively reduced; and when the magnetic suction rods are close to the inner wall of the elevator shaft, a certain mutual adsorption force is generated between the magnetic suction rods and the inner wall of the elevator shaft, so that the shaking amplitude can be further reduced, and the potential safety hazards are reduced.

The bearing platform for the platform type home elevator comprises a base plate, a bearing assembly and a platform plate, the platform plate is fixedly installed above the bearing assembly, and the bearing assembly is fixedly connected with the base plate; one side edge of the platform plate is connected with the base plate, and the other side edges of the platform plate are connected with sensing frames; a first installation part is arranged on the inner side of the sensing frame, a second installation part matched with the first installation part is arranged on the side edge of the platform plate, the first installation part and the second installation part are distributed in the Z direction of the bearing platform, and a sensing assembly is installed between the first installation part and the second installation part and used for sensing the Z-direction displacement amount between the platform plate and the sensing frame; the thickness of the bearing platform can be controlled while the bearing platform meets the rated load, the sensing frame is installed on the side edge of the platform plate, the sensing assembly is installed between the sensing frame and the platform plate, the body parts of passengers and foreign matter can be prevented from being clamped into a gap between the platform plate and a hoistway, and the safety performance is greatly improved.

The invention discloses a derrick structure of a household elevator. The derrick structure comprises stand columns and crosspieces, wherein each stand column comprises a hollow main pipe, connecting parts are arranged on the two adjacent side faces of each hollow main pipe correspondingly, vertical rotation stopping grooves are formed in the inner side faces of the connecting parts, and transverserotation stopping grooves are formed in the inner side faces of the crosspieces; the derrick structure further comprises T-shaped connecting pieces, each T-shaped connecting piece comprises a vertical connecting edge and a transverse connecting edge, through holes are formed in the connecting edges, bolts are arranged in the vertical rotation stopping grooves and the transverse rotation stoppinggrooves, the bolts in the vertical rotation stopping grooves penetrate through the through holes in the vertical connecting edges and are connected with nuts, and the bolts in the transverse rotationstopping grooves penetrate through the through holes in the transverse connecting edges and are connected with nuts; and shielding pieces are arranged on the inner sides of the stand columns, each shielding piece comprises two shielding plates perpendicular to each other, and the shielding plates are used for shielding the T-shaped connecting pieces between the corresponding crosspieces and the stand columns. According to the derrick structure of the household elevator, by arranging the shielding pieces, the connecting pieces and fastening pieces on the derrick can be effectively shielded, andtherefore the attractiveness of the derrick is improved.