370results about How to "Adjustable length" patented technology

The utility model discloses a low-altitude aircraft which comprises an aircraft body, four fixed machine arm rods are arranged in the cross direction of the aircraft body, the surfaces of the fixed machine arm rods are movably connected with movable machine arm rods, one sides of the movable machine arm rods are provided with locking pieces, and the other sides of the movable machine arm rods are connected with the locking pieces. The locking piece comprises fixing frames fixed to the top and the bottom of one end of the movable machine arm rod, a connecting plate is arranged on one side of each fixing frame, and a clamping column is fixedly connected to the inner side of each connecting plate. The fixed machine arm rod can move in the inner cavity of the movable machine arm rod, so that the total length of the fixed machine arm rod and the movable machine arm rod can be changed, the length of the machine arm can be adjusted, the two clamping columns enter the through holes, the adjusted length can be locked, the length of the machine arm can be adjusted according to task requirements, and the machine arm is convenient to use. The aircraft arm is suitable for different terrains and weather conditions, dynamic adjustment of the arm of force of the propeller is achieved, lift and thrust efficiency is optimized, and the fixed aircraft arm rod and the movable aircraft arm rod can be rapidly detached and replaced.

A burner device (X) in which air (Air) ejected from an air ejection port (21) and fuel (G) ejected from a fuel ejection nozzle (30) are mixed and burned, the fuel ejection nozzle (30) being provided with a short-flame fuel ejection nozzle (31) and a long-flame fuel ejection nozzle (32), the short-flame fuel ejection nozzle (31) and the long-flame fuel ejection nozzle (32) being disposed in the short-flame fuel ejection nozzle (31), and the long-flame fuel ejection nozzle (32) being disposed between the short-flame fuel ejection nozzle (31) and the long-flame fuel ejection nozzle (32). The short-flame fuel discharge nozzle (31) mixes and burns the fuel at a position close to the air discharged from the air discharge port, and the long-flame fuel discharge nozzle (32) mixes and burns the fuel at a position away from the air discharged from the air discharge port.

The utility model discloses a kind of dust removal skeletons for flue gas filtering, comprising: skeleton body;Skeleton body includes movable lid of upper end and the barrel body of lower end arrangement installation;Movable lid includes the internal thread of its inner end setting;Barrel body includes the upper support ring and lower support ring of its upper and lower end respectively fixed installation, the upper fixed frame and lower fixed frame of upper support ring and lower support ring inner end respectively fixed installation.The utility model said a kind of dust removal skeletons for flue gas filtering, the barrel body of skeleton body lower part, can be carried out convenient thread connection by the stud and the threaded hole of its upper and lower end upper fixed frame and lower fixed frame middle part, to adjust the length of skeleton body whole according to use requirement, to improve its assembly convenience and adjustment convenience, simultaneously, middle support ring welded in barrel body middle part, and the support strip supported to support rod inner end by middle support ring upper and lower end, barrel body middle part's stability and impact resistance can also be enhanced, to improve its stable performance in use.

The utility model relates to the field of wrenches, and discloses a multifunctional automobile repair wrench which comprises a rod body, a groove is formed in the middle end of the rod body, the right end of the rod body is connected with a movable rod in a sliding mode, the movable rod is connected with the rod body through an adjusting assembly, and the right end of the movable rod is fixedly connected with a socket wrench head. The right end of the socket wrench head is fixedly connected with a skid, the left end of the rod body is fixedly connected with an adjusting wrench head, the left end of the adjusting wrench head is provided with a screwdriver head, and the top end of the rod body and the left end of the adjusting wrench head are each provided with a containing groove. According to the bolt screwing device, the movable rod is pulled out of the rod body, the length of the force arm can be adjusted, a worker can screw a bolt more easily, the bolt screwing efficiency and operation convenience are effectively improved, the bolt screwing difficulty of the worker is reduced, the movable rod can be fixed by ejecting the limiting block into the groove through the spring, and the bolt screwing device is convenient to use. Therefore, the position stability of the movable rod is ensured.

The utility model relates to the technical fields of drainage tube especially, it is a kind of medical drainage tube device including drainage tube, flushing channel, locking assembly, external pipe, flushing assembly, effusion bag and negative pressure drainage connector, the middle part of drainage tube is provided with telescopic corrugated drainage tube, flushing channel is set up on the inner wall of drainage tube, the middle part of flushing channel is provided with corrugated flushing channel, locking assembly is set up in the outside of telescopic corrugated drainage tube, external pipe is set up in the side of drainage tube, external pipe is communicated with flushing channel, flushing assembly is connected with external pipe, effusion bag is connected with one end of drainage tube, negative pressure drainage connector is set up in the front end of drainage tube, wherein, by the cooperation of each component, the purposes of abdominal cavity and other parts drainage function can be realized, change drainage tube length and the function of cleaning drainage tube are realized simultaneously.

The utility model relates to the field of agricultural machinery engineering technology discloses a leek field weed cleaning device, include: handle, for U type state, horizontal setting, U type middle part both sides can place the shoulder strap, shoulder strap, total two groups, through two groups of round magic paste and paste to handle, sliding rod, by a group of thick cylinder and a group of thin cylinder weld together, and place obliquely, and thick cylinder is fixed in handle middle part one side, and thin cylinder one end is provided with fixed mechanism, fixed rod, for cylinder cover, place obliquely, and its one end and the thin cylinder end of sliding rod sliding connection. The locking effect of sliding rod cooperation and fixed mechanism can quickly adjust the overall length of the device, adapt to different height users, the position adjustment of sliding blade and L type board can flexibly change the operation distance, accurately adapt to different row distance leek field, the shoulder strap is convenient for user to bear the device, reduces the handheld operation burden, the adjustment component is simple to operate, and can be stored and save space, improves overall operation efficiency and use safety.

This invention discloses a processing device and installation method for a manhole hoop ring in a diaphragm. The processing device includes a straightening rod assembly, which comprises a telescopic rod, a screw top plate, a hoop ring clamping plate, and a locking component. The screw top plate is located at both ends of the telescopic rod, and the locking component is located between the screw top plate and the hoop ring clamping plate. The installation method includes the following steps: 1. Fixing the half hoop ring on a straightening platform; 2. Preheating the half hoop ring using a hoop ring reciprocating heater; 3. Straightening the half hoop ring by bending; 4. Fixing the straightening rod assembly onto the half hoop ring; 5. Installing the half hoop ring into the manhole of the diaphragm; 6. Straightening the half hoop ring using the straightening rod assembly and spot welding it in place. The processing device in this invention is easy to adjust and highly applicable, solving the problem of installation issues caused by size mismatch between the existing hoop ring and the manhole of the diaphragm. The installation method is easy to operate, step-by-step, and has low operational difficulty. Adjustments can be made promptly during installation, ensuring installation quality.

The application relates to a reinforcing device for the bottom of a beam with a special-shaped section and a reinforcing method, the device comprises a supporting assembly and a frame assembly; the supporting assembly comprises an upwardly-inclined supporting rod, the top end of the supporting rod is connected to the lower surface of the frame assembly; the frame assembly comprises a stress plate and a plurality of U-shaped plates connected above the stress plate, the stress plate is arranged along the length direction of the beam, and the lower surface of the stress plate is fixedly connected with the top end of the supporting rod. The method can quickly reinforce the bottom of the beam, the supporting plate and the stress plate are only needed to be fixed, then the position of each U-shaped plate is adjusted by using a jackscrew, the bottom of the beam can be supported, the steps are compact, the implementation effect is good, the amount of used molds is reduced, and the construction cost is lowered.

The utility model relates to a winding drum steel wire rope disordered rope detection device which comprises a support, a trigger rod and a detector fixedly installed on the support. The trigger rod is horizontally installed on the support and can float up and down to make contact with the detector. The device has the beneficial effects that the structure is simple, the design is reasonable, rapid detection of the disordered rope can be realized, the device has the advantages of good practical effect, labor cost saving, safety, reliability and the like, and the problems that a traditional winding drum steel wire rope disordered rope detection device can only customize the boundary dimension and the installation height according to the winding drum size, cannot be produced in batches and cannot be universal are solved.

The utility model relates to the technical field of overwater salvaging devices, in particular to an inland river overwater salvaging grabbing device which comprises a holding rod frame, the holding rod frame comprises an outer frame and a holding frame, the holding frame is installed in the outer frame in a sliding mode, a fixing pipe is fixedly installed at the lower end of the outer frame, an extending pipe is installed at the lower end of the fixing pipe in a sliding mode, and the extending pipe is connected with the fixing pipe. Locking bolts for locking the extension pipe are arranged on the two sides of the fixing pipe, and a center shell is fixedly installed at the lower end of the extension pipe. By arranging the slidable holding frame, an operator can conveniently adjust the holding position, through cooperation of a fixed pipe and an extension pipe and arrangement of a locking bolt, the length of the device can be adjusted according to actual fishing requirements, and the device adapts to fishing operation of different depths. And the multiple clamping claws and the driving frame are installed on the center shell, synchronous clamping of the objects can be achieved, and the fishing efficiency is improved.

The utility model discloses a reinforcing steel bar bending device for constructional engineering, and aims to solve the technical problem that the working efficiency is affected as a reinforcing steel bar bending device in the prior art cannot bend a plurality of reinforcing steel bars simultaneously, the reinforcing steel bar bending device comprises a machine tool, and the left side of the top of the machine tool is rotatably connected with a threaded adjusting rod; the right side of the top of the machine tool is fixedly connected with a guide sliding rod, the top of the machine tool is slidably connected with a limiting plate, the right side of the machine tool is fixedly connected with a pair of limiting frames, and the corresponding sides of the two sets of limiting frames are each provided with a set of arc-shaped limiting sliding grooves. Compared with an existing reinforcing steel bar bending device, the reinforcing steel bar bending device has the advantages that multiple sets of reinforcing steel bars can be conveniently bent at the same time through the design, the working efficiency of reinforcing steel bar machining is improved, and the overall practicability is enhanced.

The utility model belongs to the technical field of road surface detection, particularly relates to a road surface settlement detection device, and provides the following scheme aiming at the problems that time and labor are consumed and the measurement precision is difficult to guarantee because most of the existing road settlement detection methods adopt manual visual inspection according to experience. An auxiliary plate is arranged on the upper side of the main plate, a fixing block is fixed to the side end of the auxiliary plate, a measuring rod used for measuring the settlement pavement slides in the fixing block, a dial gauge is arranged at the side end of the measuring rod, a set of attaching assemblies are arranged in the fixing block, and the attaching assemblies are used for driving the measuring rod to measure the settlement pavement; the positioning assembly is arranged between the fixing block and the measuring rod and is used for positioning the measuring rod; a group of adjusting assemblies are arranged between the main plate and the auxiliary plate, and the adjusting assemblies are used for adjusting the length between the fixing blocks and the main plate; and through the arrangement of the attaching assembly, the measuring bottom plate can be tightly attached to the settlement pavement, and the measuring accuracy is further improved.

The utility model discloses a high adaptability electric turning brush frame radius adjusting device, including the mounting bracket of rectangular frame structure, the both ends of mounting bracket all are along the sliding seat of mounting rack length direction slidingly arranged, the top of sliding seat is equidistantly arranged with the base along the width direction of mounting rack, the vertical rotation of base is provided with the support of the shape of chi, and the support telescopic setting, and the movable end of adjacent support is hinged in the both ends of apron respectively, and the side wall of apron is connected with the mounting plate of being used for installing carbon brush over the vertical rotation and can be axially sliding telescopic support relative to the support column, the position angle of apron is fine -tuned, makes the mounting plate on apron can accurately close to the collecting ring, satisfies the demand of turning.

The utility model discloses a kind of EGR valve fixed support that can prevent vibration, it is related to EGR valve technical field, including mounting plate, EGR valve body, further include: adjusting assembly, set in the mounting plate, for adjusting the length of fixed support;Locking assembly, set in the mounting plate, for locking adjusting assembly;Mounting assembly, set in the adjusting assembly, for installing EGR valve body;Fixed component, set in the mounting assembly, for fixed mounting assembly;Damping component, set in the mounting assembly, for preventing EGR valve body vibration, by the cooperation of adjusting assembly, utilize the knob of rotation to drive screw rod rotation, so that screw rod drives adjusting plate movement, to make the sliding plate fixedly connected with adjusting plate slide along support shell, to reach the length of fixed support can be adjusted, so that fixed support can be installed on different vehicle models, expand the application range of fixed support.

This utility model discloses a safety protection device for ultra-high formwork support, including a safety buckle, a rotation auxiliary component, and a safety belt. The safety buckle and rotation auxiliary component are both mounted on a first guide rail and a second guide rail. An adjustment box is provided on the safety buckle. One end of the safety belt is connected to a retractor, and the other end passes sequentially through the safety buckle, the rotation auxiliary component, and the adjustment box, connecting to a safety ring. Multiple first elastic protrusions are evenly distributed on the upper and lower surfaces of the safety belt. Two limiting plates are provided inside the adjustment box. Multiple second elastic protrusions are evenly distributed on one side of each limiting plate, with the first and second elastic protrusions interlocking. A support mechanism is provided on the other side of the limiting plate. This utility model, by incorporating a safety buckle and an adjustment box, allows workers to easily and slowly adjust the length of the safety belt extending beyond the adjustment box at any time, expanding the workspace, preventing accidental activation of the centrifugal mechanism, and providing high flexibility and safety.

The application provides an electric lifting table support and an electric lifting table, and belongs to the field of smart home. The electric lifting table support comprises a tabletop assembly, a transmission telescopic rod, a driving assembly and two lifting legs; the tabletop assembly comprises an inner cross beam, an outer cross beam and two longitudinal beam supporting arms, one end of the inner cross beam is connected with one longitudinal beam supporting arm, the other end of the inner cross beam is inserted into one end of the outer cross beam, the other end of the outer cross beam is connected with the other longitudinal beam supporting arm; the lifting legs are connected with the longitudinal beam supporting arms; the two ends of the transmission telescopic rod are respectively in transmission connection with the two lifting legs; the driving assembly is used for driving the transmission telescopic rod to rotate, so as to drive the two lifting legs to synchronously lift. Under the action of the transmission telescopic rod, only one driving assembly can transmit power to the two lifting legs, and the transmission telescopic rod can also change the length by telescoping, so that it can be adapted to tabletop panels of different sizes. The electric lifting table support not only can adjust the length, but also has a simple structure, which is conducive to reducing the cost.

This utility model discloses a safe operating platform for bridge construction, relating to the field of bridge construction. It includes a bottom component, with suspension rods at the upper end of each bottom component. An installation end is fixedly connected to the upper end of each suspension rod, and reinforcing crossbars are fixedly connected to opposite sides of each suspension rod. A side component is located at the lower end of the bottom component. Using this structure, after disengagement, the length of the bottom component can be increased by pulling the side sleeves to both sides. After adjusting the length of the bottom main board, the bottom component can be fixed by connecting the threaded post to the threaded hole, allowing the locking block to engage with the locking hole again. This allows for convenient adjustment of the operating platform's distance to increase the usable area during use. Furthermore, the flexible expansion mechanism allows for quick adjustment of the platform's left and right distance according to actual operational needs, adapting to different scales of work scenarios.

The supporting leg assembly comprises a first pipe fitting, a second pipe fitting, a third pipe fitting, an outer pipe fitting, a first locking assembly and a second locking assembly, and the upper end of the second pipe fitting penetrates through the lower end of the first pipe fitting and is contained in the first pipe fitting in a sliding mode. The upper end of the third pipe fitting penetrates through the lower end of the second pipe fitting and is contained in the second pipe fitting in a sliding mode, the outer pipe fitting surrounds the outer side of the second pipe fitting, and the upper end of the outer pipe fitting is arranged on the second pipe fitting in a sleeving mode. In the embodiment of the utility model, when the outer pipe fitting rotates along the first direction, the second locking component locks the second pipe fitting and the third pipe fitting, the first locking component selectively locks the first pipe fitting and the second pipe fitting at the same time, and when the outer pipe fitting rotates along the second direction, the second locking component unlocks the second pipe fitting and the third pipe fitting. The first locking assembly can selectively unlock the first pipe fitting and the second pipe fitting at the same time, the first locking assembly and the second locking assembly can be operated at the same time or independently, operation is diversified, and different operation scenes are used.

The utility model relates to fruit picking technical field, and disclose a kind of high fruit picker, including annular, the inside one side of annular is fixedly connected with mounting bracket, the one side of mounting bracket is equipped with threaded hole, the top of mounting bracket is threadedly connected with blade, the bottom of annular is fixedly connected with anti-falling net, the bottom of anti-falling net is fixedly connected with air bag, the one side of air bag is fixedly connected with inflation port, the one side of inflation port is fixedly connected with plug, one end of anti-falling net is fixedly connected with circular support, the bottom of circular support is fixedly connected with base, the bottom of base is fixedly connected with ground insertion.This high fruit picker is set by setting anti-falling net, air bag, plug, circular support and ground insertion, without picking one fruit each time to be picked down and placed fruit picker, avoid the time wasted by frequent lifting picker, greatly improve picking efficiency, more fruit picking work can be completed in shorter time, satisfy the demand of large-scale fruit picking of agriculture.

The utility model discloses a sampling device for epoxy resin finished product detection, which comprises a shell, the shell is a cylinder, an outlet is arranged on the side face of the shell, a tubular grip is arranged at the outlet, the front end of the grip is connected with an extension tube through threads, the front end of the extension tube is connected with a connecting tube through threads, and a fixing buckle is arranged right in front of the connecting tube. The outer side of the connecting pipe is fixedly connected with the outer side of the fixing buckle through a connecting rod, a detachable piston barrel is installed on the fixing buckle, a piston is arranged in the piston barrel, a piston rod is connected behind the piston, and a threaded column is connected to the rear end of the piston rod. According to the sampling device for epoxy resin finished product detection, modular design is adopted, the overall length of the device can be adjusted by increasing or reducing the number of connected extension pipes so as to adapt to different working scenes, a crank is arranged to drive a reel to rotate and wind a steel wire rope, and the steel wire rope can pull a piston and a piston rod to move backwards; and the epoxy resin is sucked into the piston cylinder through negative pressure.

The utility model relates to the technical field of electric coagulation haemostatic forceps, and discloses a miniature electric coagulation haemostatic forceps for animal test surgery, which comprises two connecting rods, the left sides of the two connecting rods are fixedly connected with extension rods, the exteriors of the two extension rods are connected with sliding sleeves in a sliding manner, elastic assemblies are arranged in the extension rods, and the elastic assemblies are connected with the sliding sleeves in a sliding manner. A sliding groove is formed in the left side of the interior of the extension rod, a hemisphere is fixedly connected to the bottom of the elastic assembly, a plurality of clamping grooves are formed in the bottom side of the interior of the sliding sleeve, an outer clamp body is fixedly connected to the left side of one connecting rod, and an inner clamp body is fixedly connected to the left side of the other connecting rod. According to the haemostatic forceps, after the hemisphere moves to the designated clamping groove position, the spring releases elastic potential energy, the hemisphere is pushed to reset and be clamped in the clamping groove in the bottom of the sliding sleeve, and therefore the length of the haemostatic forceps is locked. The length of the hemostatic forceps can be flexibly adjusted according to the requirements of different operation scenes, and a doctor can operate and use the hemostatic forceps conveniently.

This utility model relates to a clamping and fixing tool for disassembling and assembling a speed sensor. The clamping and fixing tool is used for positioning and clamping the speed sensor. The tool includes a first support rod, a second support rod, and a handle. The handle is fixed to the top of the first support rod. The top of the second support rod is telescopically connected to the bottom of the first support rod. When the clamping and fixing tool is in use, the bottom of the second support rod is connected to the speed sensor. Compared with the prior art, the clamping and fixing tool of this utility model can be applied to the positioning and clamping of sensors in narrow, confined spaces, and provides reliable support for the operation of this type of equipment, thereby improving work efficiency and avoiding quality risks caused by tool unreliability.

The utility model provides a product surface burr removing device suitable for a machining center and the machining center, the product surface burr removing device comprises a mounting handle, a sleeve and a brush body, the mounting handle is coaxially mounted at the bottom of a main shaft of the machining center; the top of the sleeve is provided with a clamping part which is coaxially clamped at the bottom of the mounting handle, the bottom of the sleeve is provided with a brush mounting cavity, and the brush body is coaxially and slidably mounted in the brush mounting cavity and is fixed through a quick release part; an elastic piece is installed between the top of the brush body and the cavity bottom of the brush installation cavity and used for applying downward elastic force to the brush body. The deburring technology is integrated in the machining center, the brush is directly driven to work through the main shaft, operation is safe and convenient, labor intensity and safety risks can be effectively reduced, the consistency of the deburring effect can be guaranteed, and therefore product quality is improved, investment of independent deburring equipment is omitted, the production cycle is remarkably shortened, and production cost is reduced. The length of the brush can be quickly adjusted through the quick release piece and the elastic piece so as to compensate the abrasion loss of the brush.

This invention discloses a method for preparing and applying an antibacterial composite coating based on quaternized zinc oxide nanoparticles. The preparation method includes: grafting quaternary ammonium salt compounds onto the surface of zinc oxide nanoparticles to prepare synergistic antibacterial nanoparticles; modifying the substrate surface by co-deposition of dopamine and polyethyleneimine to introduce active functional groups; and spraying or dipping the quaternized zinc oxide nanoparticles onto the modified substrate surface to obtain the antibacterial composite coating. This novel antibacterial material preparation scheme can integrate the advantages of zinc oxide nanoparticles and quaternary ammonium salts, while solving key technical problems such as nanoparticle aggregation, weak interfacial bonding, and limited antibacterial efficiency. It is of great significance for promoting the upgrading of hygiene and safety in the fields of medicine, food, and building materials.

The utility model discloses a size measuring device for plastic mould production, which comprises a base plate, a lifting platform is arranged at the top of the base plate, a lifting mechanism is arranged between the lifting platform and the base plate, a vertical rod is fixedly arranged on one side of the top of the base plate, the vertical rod penetrates through the lifting platform, and the vertical rod is in sliding connection with the lifting platform. The orientation of the main measuring ruler is conveniently adjusted by rotating the clamping sleeve, the main measuring ruler is conveniently adjusted by sliding the sliding sleeve, the sliding sleeve is fixed by rotating the first locking bolt, the fixed measuring mechanism is attached to a mold by sliding the main measuring ruler during measurement, and the measurement accuracy is improved. The mobile measuring mechanism slides to be attached to the other side of the mold so as to measure the mold, the steps are repeated, the size of the mold in the other direction can be conveniently measured, the mold does not need to be moved or measured by holding the measuring mechanism by hand, and use is convenient.

The utility model relates to the field of anti-seismic supports and hangers, in particular to an anti-seismic support and hanger applied to pipeline installation, which aims at solving the problem that the anti-seismic support and hanger in the prior art is inconvenient to adjust, and adopts the following scheme that the anti-seismic support and hanger comprises a cross beam, and connecting mechanisms are detachably mounted at the two ends of the top surface of the cross beam; a plurality of pipeline fixing mechanisms are mounted on the top surface of the cross beam; the connecting mechanism comprises a mounting assembly and a fixing assembly. The mounting assembly comprises a fixing plate detachably fixed to the cross beam and a fixing sleeve fixed to the top face of the fixing plate. The fixing assembly comprises a vertical hanging rod and a plurality of side hanging rods detachably connected to the fixing plate, and the vertical hanging rod comprises a movable screw rod, a first threaded cylinder and a second threaded cylinder, wherein the first threaded cylinder and the second threaded cylinder are connected to the two ends of the movable screw rod in a threaded and sleeving mode respectively. According to the pipeline fixing device, pipelines of different sizes can be conveniently fixed, all parts can be conveniently assembled, meanwhile, the height of the cross beam can be adjusted after installation is completed, and the use range is widened.

The utility model discloses a kind of floating rack steering axle structures, belong to fork truck steering axle field. Including: slewing support, cylinder barrel assembly, floating rack assembly and support pinion shaft. Cylinder barrel assembly includes left cylinder barrel and right cylinder barrel, left cylinder barrel open end is fixedly inserted in the inside of slewing support left side interface, right cylinder barrel open end is fixedly inserted in the inside of slewing support right side interface;Floating rack assembly includes rack body, left piston and right piston, left piston is slidably embedded in left cylinder barrel, left piston is tightly attached to rack body left end, right piston is slidably embedded in right cylinder barrel, right piston is tightly attached to rack body right end;The top gear ring of support pinion shaft is engaged with the transmission gear portion opened in the middle part of rack body. The utility model reduces cylinder barrel machining precision requirement, assembly efficiency is improved by more than 20%, compresses slewing support axial space 15%-20%, oil seal life is extended to 2 times of traditional structure.

A keyboard includes a bottom plate, a plurality of keys, and a backlight module. The bottom plate has a short axis direction and a long axis direction. The keys are disposed on the bottom plate. The backlight module is disposed on one side of the bottom plate. The backlight module includes a light shielding sheet, a light guide plate, and a reflective sheet. The light shielding sheet includes an upper surface and a lower surface, and the upper surface faces the bottom plate. The light guide plate is disposed on the lower surface of the light shielding sheet. The light guide plate includes a plurality of light guide structures, and the light guide structures correspond to the keys, respectively. Each of the light guide structures includes a ring-shaped portion and at least one continuous fold line portion. The continuous fold line portion is connected to the ring-shaped portion, and the ring-shaped portion is formed by a plurality of bending portions. The reflective sheet is disposed below the light guide plate.