58results about How to "Adjustment space" patented technology

The invention provides a view-variable three-dimensional reconstruction device based on laser radar swinging. The view-variable three-dimensional reconstruction device comprises a laser radar swinging mechanism, a mechanism movement control module and a three-dimensional point cloud reconstruction module, wherein the laser radar swinging mechanism comprises a single-line laser radar, a laser radar center fixing mechanism and a laser radar swinging control mechanism, the single-line laser radar is three-dimensional point cloud data collecting equipment, the laser radar center fixing mechanism bears the weight of the laser radar and fixes the center of the laser radar, and the laser radar swinging control mechanism achieves regulation of the view range of the laser radar and drives the laser radar to swing in an omni-directional manner; the mechanism movement control module controls the movements of the laser radar swinging mechanism and measures the pose of the laser radar in real time; the three-dimensional point cloud reconstruction module splice multiple frames of laser radar measuring data to reconstruct spatial three-dimensional point cloud. The view-variable three-dimensional reconstruction device has the advantages that measuring and reconstruction of a three-dimensional environment can be completed, the view range and point cloud distribution can be regulated according to needs so as to emphasized measuring of the space information of different positions, and the device is high in precision, high in reliability and good in adaptability.

The invention discloses a multifunctional file cabinet. The cabinet comprises a main cabinet body, a partition is fixedly connected into the main cabinet body, a plurality of first sliding plates vertically arranged are arranged on one side of the partition, a first sliding mouth and a second sliding mouth which are corresponding to both ends of each first sliding plate are arranged in the main cabinet body, a first sliding rod is fixedly connected into the first sliding mouth, the first sliding rod is connected to the ends, located in the first sliding mouth, of the first sliding plates in a sliding and sleeved mode, a first threaded rod is connected into the second sliding mouth in a rotational mode, the first threaded rod is connected to the ends, located in the second sliding mouth, of the first sliding plates in a sleeved mode, a first gear is fixedly connected to one end of the first threaded rod in a sleeving mode, and a first supporting block is connected to the end, close to the first gear, of the first threaded rod in a rotational and sleeving mode. According to the cabinet, through arrangement of multiple adjustment mechanisms, compartments in the file cabinet can be freely adjusted, files with different types and sizes can be subjected to neat and reasonable placement.

The invention relates to the technical field of storage shelves for articles of daily use, in particular to a multifunctional storage shelf special for articles of daily use and aims to solve the technical problem that goods on a top layer are difficult to store and the size is difficult to change through cells. For solving the above technical problem, the multifunctional storage shelf special forarticles of daily use comprises a device box, wherein the middle position of the bottom of the inner wall of the device box is fixedly connected with a forward-reverse servo motor, the output end ofthe forward-reverse servo motor is fixedly connected with a worm wheel, the bottom and the top of the inner wall of the device box are respectively fixedly connected with two ends of two first supporting columns. Storage shelf plates can ascend or descend, so that the goods on the top layer is convenient to store, the storage and taking process is quicker, more effort is saved, the time required for storing or taking goods is greatly shortened, accordingly the working time is normal, and the working efficiency is improved.

The invention relates to a preparing and packaging machine, in particular to a traditional Chinese medicine preparing and packaging machine. To solve technical problems in the prior art, the inventionprovides the traditional Chinese medicine preparing and packaging machine which can quickly prepare Chinese herbal medicines and is simple to operate. The traditional Chinese medicine preparing and packaging machine comprises a frame, a material storage assembly, a material control assembly, a discharging assembly, a mixing assembly and the like, wherein the material storage assembly is arrangedat the top of the frame; the material control assembly for controlling materials in a sliding mode is arranged at the bottom of the material storage assembly; the discharging assembly for dischargingin a rotating mode is arranged on the front side of the material control assembly; and the mixing assembly for mixing materials in a left-and-right shaking mode is arranged at the bottom of the material control assembly. Through cooperation of the discharging assembly and the mixing assembly, traditional Chinese medicines are rapidly mixed and prepared; through cooperation of a material storage frame and partition plates, different kinds of medicines can be distributed; and through cooperation of nuts and screws, the space of a discharging barrel can be adjusted according to the amount of a prepared medicine, so the discharging barrel is applicable to preparation of different amounts of medicines.

The invention provides a multifunctional clinical lab sample saving and cleaning combination device. The device comprises a working shell, a water storage tank, a water pump, a first conveying tube, aconnecting pipe, a first spray head, a liquid storage tank, a booster pump, a second conveying tube, a second spray head, a glass door, a movable handle, supporting columns, a storage box, supportingfeet, a PLC, a driving switch, a movable cleaning frame structure, a separable storage drawing box structure, a detachable sewage collection and treatment barrel structure, an adjustable supporting fixed frame structure, a baffle and an ultraviolet sterilizing lamp, wherein the water storage tank is welded to the upper left portion of the working shell, the water pump is installed at the lower right side of the front portion of the water storage tank through bolts, and the rear end of the water pump is connected with the water storage tank through a flange. The device has the advantages thatthrough the arrangement of the movable cleaning frame structure, when a movable column is moved from left to right, the position of a connecting frame can be adjusted accordingly, and therefore a brush cylinder clamps utensils of different sizes to perform cleaning work.

The invention discloses a combined type agricultural tool box with a classifying function. The combined type agricultural tool box comprises a shell. First sliding grooves are formed in the upper surface and the lower surface of the inner wall of the shell, first sliding blocks are connected in the two first sliding grooves in a sliding manner, and the opposite faces of the two first sliding blocks are fixedly connected to the upper surface and the lower surface of a baffle correspondingly. The back face of the baffle is fixedly connected with a second sliding block, and the second sliding block is connected in a second sliding groove in a sliding manner. By means of the combined type agricultural tool box with the classifying function, a first handle, a first rotating shaft, a first bearing, a threaded pillar, a threaded nut and a second sliding block are arranged, people drive the first rotating shaft and the threaded pillar to rotate by rotating the first handle forwards or backwards, and therefore the space sizes of the left side and the right side of the baffle can be adjusted; and due to the fact that limiting plates with different lengths are replaced so that people can select the positions for carrying agricultural tools according to the sizes of the agricultural tools, and therefore convenience is brought to people when people take and put the agricultural tools.

The invention relates to an initiation system based on boron trifluoride and a method for preparing polyisobutylene using the initiation system. The initiation system is composed of BF3, a proton donor and an electron donor, wherein the proton donor can be selected from water, methanol, ethanol, phenol, orthocresol, aromatic alcohol or aromatic acid compound; and the electron donor is an organic compound containing C3-C10 saturated oxa heterocyclic ether, cyclic amine aza heterocycle or epithio ether heterocycle. Two kinds of polyisobutylene with different molecular weights and narrower molecular weight distribution can be prepared according to needs by using the initiation system and adopting a common tank reactor: (1) medium-molecular-weight polyisobutylene, which has the molecular weight of 5*10<4>-1.5*10<5>, narrower molecular weight distribution and distribution index number (Mw / Mn) of 2.3-3.5; and (2) high-molecular-weight polyisobutylene, which has the molecular weight of 2.0*10<5>-1.5*10<6>, narrower molecular weight distribution and distribution index number (Mw / Mn) of 2.3-3.5. The production process is simple and the production cost is saved.

The invention relates to the field of computer network security protection, and particularly relates to a big data computer network security protection device. The device comprises an outer box body,wherein the middle end in the outer box body is provided with an inner box body; cavities are formed in the upper and lower ends of the left and right sides of the inner box body; a sliding grooves are formed in the cavities; a limiting rod is fixedly mounted in the sliding groove in the left end; a lead screw is mounted in the sliding groove in the right end through a bearing seat; sliding blocksare mounted on the lead screw and the limiting rod; connecting blocks are fixedly mounted on the inner sides of the sliding grooves; a placement plate is arranged between the connecting blocks; blowing covers are arranged at left and right ends of the top of the inner box body; a blowpipe is arranged on the upper side of each blowing cover; a blowing pump is arranged on each blowpipe; exhaust hoods are arranged at the left end and the right end of a partition plate at the lower end of the inner box body; an exhaust pipe is arranged on the lower side of each exhaust hood; an exhaust pump is fixedly mounted on each exhaust pipe; and filter screens are fixedly mounted at the left end and the right end of the lower side of the inner box body. According to the invention, the interior of the equipment can be effectively and conveniently ventilated, and the safe use of the equipment is ensured.

The invention relates to a M-methyl pyridine tetrazole copper [I] complex blue-light emitting material. The M-methyl pyridine tetrazole copper [I] complex blue-light emitting material is characterizedby being a perchlorate [Cu4[5-(5-methyl-2-pyridyl)tetrazolate]2[bis(diphenylphosphino)methane]4][ClO4]2 complex with the molecular formula of Cl14H100Cl2Cu4N10O8P8. The invention further provides twopreparation methods of the M-methyl pyridine tetrazole copper [I] complex blue-light emitting material. The M-methyl pyridine tetrazole copper [I] complex blue-light emitting material belongs to a new blue-light emitting material and has a favorable development prospect.

The invention discloses an examination illumination device for the obstetrics and gynecology department, and relates to the technical field of obstetrics and gynecology department appliances. The examination illumination device for the obstetrics and gynecology department comprises a box body, and an illumination lamp is installed on the box body; a straight rack which is in meshing connection with a transmission gear is vertically arranged on the left side of the transmission gear, and a connecting rod which is in vertical sliding fit with the box body is horizontally fixed to the straight rack; and a bottom plate which is arranged to be opposite to a swinging plate is horizontally fixed to the lower side wall of the illumination lamp, a flexible corrugated plate is fixedly connected between the bottom plate and the swinging plate, and a lamp bulb located in a space formed by the flexible corrugated plate, the bottom plate and the swinging plate in an enclosing mode is arranged on theillumination lamp. According to the examination illumination device for the obstetrics and gynecology department, illumination lamp height adjusting can be achieved by rotating a hand wheel, and therefore the illumination position of the lamp bulb can be flexibly adjusted; the swinging plate can swing relative to the bottom plate, therefore, adjusting on the space formed by the bottom plate, theswinging plate and the flexible corrugated plate in the enclosing mode is achieved, and adjusting on the illumination ray of the lamp bulb is achieved; and operation is easy and convenient, adjustmentis easy, and the illumination requirements of existing obstetrics and gynecology department examination are met.

The invention discloses a diesel generator set grid-connected system, which comprises a control cabinet and a diesel generator set. The control cabinet comprises a cabinet body and a controller. The inner two sides of the cabinet body are respectively equipped with a limit plate. One limit plate is fixedly equipped with an air inlet pipe. The air inlet pipe extends out of the cabinet body. The air inlet pipe is internally provided with a dedusting net. A fuse pad plate is arranged in the gap between the limit plate and the cabinet body. The fuse pad plate is fixedly equipped with a base plate. A fuse is fixedly arranged on the base plate by tightening two screws. A centrifugal fan and a radiating pipe are arranged to discharge the heat, thereby improving radiating effect; and through arrangement of the limit plates, an independent space is formed in the equipment, thereby preventing reduction of the service life of the equipment due to influence of other heat producing elements thereon, and achieving a good protection effect.

The invention relates to an auxiliary seat for high-altitude operation of a signal tower and discloses an auxiliary rest chair capable of performing auxiliary support in high altitude and capable of stably adjusting the space between the working personnel and the signal tower. The auxiliary seat is characterized in that a seat cushion is arranged on a main pipe frame, the main pipe frame is formedby crossing two pipe bodies, the crossing angle is 120 degrees-150 degrees, the lengths of the two pipe bodies are different, the short pipe body is located on the horizontal line, the length is onethird of the length of the long pipe body, the cross point of the two pipe bodies is located at the one-third part of the long pipe body, the seat cushion is arranged at one end of the long pipe body,a sliding plate is arranged at the other end of the long pipe body and is parallel to the short pipe body, two groups of guide sleeves are arranged at the bottom of the sliding plate, an inner bush is arranged in the short pipe body, an adjusting buckle is fixedly arranged at one end of the short pipe body and is positioned below the seat cushion; an adjusting rod is arranged in the short pipe body in a sleeved manner; the two ends of the adjusting rod extend out of the short pipe body; one end of the adjusting rod is arranged in a limiting ring, and the other end of the adjusting rod is provided with a clasping ring.

The invention relates to the technical field of high-voltage switch cabinets and discloses a modular combined high-voltage switch cabinet, The right side of the cabinet door is movably connected withthe left side of the front side of the cabinet body through folding, the heat dissipation mechanism is positioned on the cabinet body, the partition plate is positioned inside the cabinet body, and the adjustment mechanism is positioned inside the partition plate. The high-voltage switch cabinet comprises a cabinet body, a cabinet door, a heat dissipation mechanism, a partition plate, an adjustment mechanism and an observation window. The invention solves the problem that the space inside the high-voltage switch cabinet cannot be adjusted freely, As that two dial block are moved in opposite direction, sliding the sliding block on the sliding bar, At that same time, the limit lever and the limit hole form a detached state, on the contrary, the separating plate is fixed by the elastic forceof the squeeze spring, and the whole separating plate can be adjusted up and down, so that the space inside the whole cabinet can be adjusted, and the high-voltage switch cabinet can be assembled in amodularized manner, so that the electric power equipment can be controlled conveniently.

The invention discloses an internet e-commerce teaching projection screen. The internet e-commerce teaching projection screen includes a first panel, a second panel hinged to the first panel and a screen unfolding device mounted in a separable manner. A groove is arranged in the lower end of a right side wall of the first panel. A neck is arranged on the right end of an upper side wall of the first panel. The screen unfolding device includes a coiling block support and a coiling block mounted on the coiling block support. A screen coils on the coiling block. The coiling block support is arranged vertically and the upper end and the lower end are both provided with transverse telescopic expansion bars. The end parts of the expansion bar on the upper end are equipped with clamp blocks arranged vertically downwards. The internet e-commerce teaching projection screen is also provided with the second panel. A mounting groove and a stay rod are also arranged on the second panel. After the second panel is turned over, the stay rod can be pulled out for length adjusting, so that the length of the screen on the stay rod can be adjusted. By the arrangement of the second panel and the stay rod, the production length of the screen can be increased, so that different projection requirements can be met.

The invention belongs to the technical field of rehabilitation medical instruments, and particularly relates to a rigid-flexible coupling lumbar vertebra rehabilitation therapeutic apparatus. The apparatus comprises a pitching driving motor, a pitching driving connecting rod, a pitching mounting frame, a back supporting frame, a flexible arc-shaped back plate and a lumbar vertebra driving mechanism. The lumbar vertebra driving mechanism comprises a lumbar vertebra driving motor, a driving belt wheel, a driven belt wheel, a lumbar vertebra supporting plate and a lumbar vertebra rotating connecting rod. Tensioning sleeves are symmetrically arranged on the upper side and the lower side of the installation shell, one end of each tensioning spring abuts against the inner wall of the corresponding tensioning sleeve, the other end of each tensioning spring abuts against a tensioning block, and the tensioning blocks abut against the outer side face of the synchronous belt. The two symmetrically-arranged lumbar vertebra driving motors rotate at the same time to drive the lumbar vertebra supporting plate to swing up and down, repeated training of the lumbar vertebra of a patient is achieved, the rigidity of the whole lumbar vertebra swing mechanism is changed by controlling the two lumbar vertebra driving motors to rotate by different angles, the lumbar vertebra supporting plate is kept at a certain position, and precise rehabilitation training is realized through variable-rigidity flexible driving.

The invention provides a vehicle. According to the vehicle, a copilot seat which is arranged conventionally is replaced with a box body, an extension plate used for supporting legs, a resting plate used for a passenger to rest and the like are arranged on the box body, a comfortable riding environment can be provided for the passenger in the back row, and the riding comfort is improved. A flat plate which can be stored is arranged on the box body, and the flat plate can be unfolded when needed for assisting in office of the passenger and used for placing a laptop or files, and a proper office environment is provided for the passenger. In addition, a sliding rail is arranged on the lower portion of the box body so that the position of the box body inside the vehicle can be adjusted; the distance between the passenger and the box body can be adjusted, so that the comfort of the passenger for using the resting plate, the extension plate used for supporting the legs, the office flat plate and the like is improved, and meanwhile the internal space of the vehicle can be adjusted to store luggage or other objects.

The invention discloses an aquaculture shallow water net cage with the adjustable aquaculture density and a using method thereof. The aquaculture shallow water net cage comprises a suspension seat, an adjusting rod, a floating seat, a movable plate and elastic sliding cloth. A positioning rope is connected to the outer side of the suspension seat, a first motor is arranged in the suspension seat, a second motor is fixed to the upper end of a stock bin through a bolt, a shaft rod is fixedly connected to the output end of the second motor through a bolt, a movable block sleeves the outer side of the shaft rod, and a guide rod is hinged to the lower end of a reset spring. According to the aquaculture shallow water net cage with the adjustable aquaculture density and the using method thereof, the aquaculture density can be conveniently adjusted, so that a net cage meets aquaculture adjustment in different seasons, feed can be automatically and evenly thrown, and waste caused by feed accumulation is avoided; and meanwhile, wave energy can be used for driving a cleaning mechanism to automatically clean the net cage, and the internal environment of the net cage is prevented from being influenced by blockage of meshes.

The invention relates to a p-methylpyridine tetrazole copper [I] complex blue light material which is characterized by being a perchlorate*di[5-[4-methyl-2-pyridyl]tetrazole]*tetra[di[diphenylphosphine]methane]tetracopper [I] complex, and the molecular formula of the complex is C114H100C12Cu4N10O8P8. The invention further provides a preparation method of the p-methylpyridine tetrazole copper [I] complex blue light material. The p-methylpyridine tetrazole copper [I] complex blue light material is a novel blue light emitting material and has good development prospects.

The invention discloses a graphite crucible lifting device. The graphite crucible lifting device comprises a support, a lifting assembly, a grabbing assembly, a buffer assembly, a lifting trolley, walking wheels, a stabilizing plate, a traction rope, a rotating wheel, a mounting plate, a first clamping block, a through groove, a fixing block, a hinge lug, a first mounting groove, a second mounting groove, a first pneumatic telescopic rod, a supporting rod, a third mounting groove, a first sliding groove, a push block, a push rod, a sliding block, grippers, a first mounting cavity, a second mounting cavity, a third mounting cavity and a second sliding groove. Compared with an existing graphite crucible lifting device, the arranged lifting assembly of the graphite crucible lifting device is more stable in the lifting process, and shaking is not prone to being generated; according to the grabbing assembly, the space between the grippers can be adjusted, so that the grabbing assembly can adapt to graphite crucibles of different specifications; and according to the buffer assembly, buffering can be generated when the grippers make contact with the crucibles, collision is avoided, the friction force between the grippers and the crucibles can be increased, and the grippers and the crucibles are firmer.

The invention relates to a desk, in particular to a desk facilitating classified placement of books. According to the desk facilitating classified placement of the books, the students can place the books in a classified mode, and other activities of the students are not hindered. The desk facilitating classified placement of books comprises a separation assembly arranged on a desk body, a lower isolation assembly arranged on the desk body, and an upper isolation assembly arranged on the desk body. The desk body is internally provided with a first partition plate and a second partition plate sothat books can be well placed in a classified mode, and a first sliding groove, a first sliding block and a sliding plate are arranged so that the space of each part can be adjusted; the desk is provided with the lower isolation assembly and the upper isolation assembly, books can be placed on the desk body in a classified mode, and the books can be prevented from falling obliquely; the deskis simple and convenient to operate, and the lower isolation assembly and the upper isolation assembly can be freely controlled to be taken up and put down, so that students are not hindered.

The invention discloses an optical port electromagnetic shielding structure of an optical module. The structure comprises a shielding shell and an upper cover, a threaded hole is formed in the bottomof the shielding shell, a screw rod is installed in the threaded hole in a threaded mode, one end of the screw rod extends into the shielding shell, one end of the screw rod is rotatably connected with a lifting plate, a sliding groove is formed in the inner wall of the shielding shell, a sliding block is fixedly welded to the side wall of the lifting plate, the sliding block is slidably mounted in the sliding groove, a sinking table is arranged at the upper end of the shielding shell, the upper cover is fixedly mounted on the sinking table at the upper end of the shielding shell through a fixing bolt, and rubber blocks are arranged on the lower surface of the upper cover at equal intervals. When in use, the height of the lifting plate can be adjusted according to the actual size of the optical module, so that the internal space of the shielding shell is adjusted, and the application range of the electromagnetic shielding structure is expanded to a certain extent.

The invention discloses a sheep foot nail trimming tool convenient to operate. The sheep foot nail trimming tool convenient to operate comprises a main body rack and a placing rack, wherein a hydraulic pump is mounted at the bottom end of the inside of the main body rack, the main body rack and the hydraulic pump are fixedly connected, a lifting rod is fixed to the top end of the hydraulic pump, avertical structure is arranged between the hydraulic pump and the lifting rod, a trimming plate is arranged on the top of the lifting rod, a trimming cutter is connected to the middle of the trimmingplate, and the trimming plate and the trimming cutter are in close attaching. For the sheep foot nail trimming tool convenient to operate, the hydraulic pump is started for pushing the lifting rod, so that the trimming plate is driven to carry out lifting movement, meanwhile, the trimming plate can be enabled to be close to the inside of the main body rack, moreover, the space between the main body rack and the trimming plate can be adjusted, so that the distance between the sheep leg and the trimming plate can be adjusted according the length of the sheep leg, in addition, the sheep leg canbe protected from being injured by the sheep foot nail trimming tool, and the diseases including limb rot, limb deformation and the like of sheep also can be prevented.

The invention relates to a multifunctional schoolbag which comprises a schoolbag belt, a schoolbag main body and a schoolbag cover. The multifunctional schoolbag is characterized in that the schoolbag main body is provided with three layers; books are placed at the bottom layer of the schoolbag main body; the opening and bottom of the second layer of the schoolbag main body are provided with plush fabrics; the second layer of the schoolbag main body is divided into a plurality of spaces by the plush fabrics through isolation strip pasters the two ends of which are ragged; and the top layer ofthe schoolbag main body is provided with the third layer, and the opening of the third layer of the schoolbag main body is provided with an elastic belt. The multifunctional schoolbag has the advantages that the internal space of the schoolbag can be adjusted at random by the isolation strips in the schoolbag according to the sizes of substances, so that electronic products carried in the schoolbag can be fixed, are not loose, can not fall off and have less possibility of being lost, and the school bag has a simple structure and is convenient to use.

The inVention discloses a special animal treatment cage for Veterinary. The cage comprises a base, wherein the upper end of the base is proVided with a limiting grooVe, the inner bottom of the limiting grooVe is proVided with a plurality of first springs, the upper ends of the first springs are connected with a retracting plate, the upper end of the retracting plate is proVided with a retracting grooVe, the inner bottom of the retracting grooVe is symmetrically proVided with two water suction pumps, first water deliVery pipes penetrate the side walls of the two water suction pumps respectiVely, the two first water deliVery pipes both penetrate through the side wall of the retracting plate and the side wall of the base in sequence, the side wall of the upper end of the retracting plate is fixedly connected with a shell body, the inner portion of the shell body is proVided with a hollow caVity, and a plurality of water through holes communicated with the hollow caVity penetrate through the side wall of the bottom of the shell body. The special animal treatment cage for the Veterinary has the adVantages that the structure is reasonable, the operation is simple, a Veterinarian adjustsspace in the cage according to actual situations conVeniently, thereby proViding conVenience for the Veterinarian to record behaViors of animals, so that better treatment is carried out conVeniently.

The invention provides a refrigerator with an adjustable internal space, and relates to the technical field of refrigerators. The refrigerator with the adjustable internal space comprises a refrigerator body, a supporting plate, two first sliding blocks and a fixing assembly; connecting plates are fixedly connected to the two opposite side faces, in the transverse direction, of the inner wall of the refrigerator body, first sliding grooves are formed in the side faces, close to each other, of the connecting plates, the first sliding grooves extend in the height direction of the refrigerator body; one ends of the two first sliding blocks are installed in the two first sliding grooves respectively and can slide in the first sliding grooves, first clamping holes are formed in the first sliding blocks in the thickness direction of the first sliding blocks; and the two side faces of the supporting plate are connected with the other ends of the two first sliding blocks correspondingly, and the fixing assembly is used for fixing the first sliding blocks into the first sliding grooves. According to the refrigerator with the adjustable internal space, adjusting the internal space of the refrigerator body can be carried out, and the requirement for placing objects of different heights is met.

The invention discloses a multifunctional computer display base. The multifunctional computer display base comprises a bookshelf, a rotating shaft, a bottom support and an adjusting column, wherein a sliding groove is formed in the surface of the bookshelf, a baffle is embedded in the sliding groove, a clamping block is embedded in the baffle, a fixing plate is fixedly connected to one side of the clamping block, a rotating shaft is movably connected to the interior of the fixing plate, and the bookshelf is fixedly connected to one end of the rotating shaft. According to the multifunctional computer display base, the bottom support is in butt joint with the bookshelf, a connecting plate is rotated through the rotating shaft, so that the connecting plate is embedded in the bottom support, an elastic block is pressed to move towards one end of a fixing spring until the elastic block and the connecting plate are clamped with each other, so that the bottom support and the bookshelf are fixed; and when the bookshelf is disassembled, one end of a pressing plate is pressed, the pressing plate extrudes the elastic block to move towards one end of the fixing spring through a supporting column, so that the bottom support and the bookshelf can be more conveniently installed and fixed.