29results about How to "No movement" patented technology

The utility model discloses a double-sided screw type copper bar, which comprises a copper bar main body and studs, two fixing round holes are arranged at the bottom of the copper bar main body, the double-sided screw type copper bar is characterized in that the studs comprise a large-specification bolt and a small-specification bolt, the middle parts of the large-specification bolt and the small-specification bolt are fixedly connected with a limiting square column, and the limiting square column is fixedly connected with the copper bar main body. And the copper bar is provided with an insertion square hole matched with the limiting square column. After the stud is installed in the copper bar main body, the small-specification bolt is sleeved with the connecting piece in a rotating mode, then the connecting piece is fixed to the copper bar main body in a welding mode, the stud and the copper bar main body form a whole under the assistance of the connecting piece, and the input end and the output end are made to be located at the same position of the copper bar main body. The input end and the output end on the front and back surfaces of the copper bar main body can be regarded as a plane, thereby compressing the space of the junction box and reducing the volume of the junction box.

The invention discloses an energy supply transformer and a monitoring system and method. The energy conversion unit comprises a shell, a sealing terminal, and an iron core, a primary winding, a secondary winding, an insulating supporting plate, an insulating limiting plate, an insulating partition plate, an insulating pad and a metal support which are arranged in the shell; the sealing terminal is arranged on the shell and is used for sealing and leading signals in the shell out of the shell; one end of the metal support is fixed with the iron core through the insulation pad, and the other end of the metal support is fixed on the inner wall of the shell; the primary winding and the secondary winding are coaxially arranged with the iron core and are sleeved outside the iron core; the insulating support plate is arranged between the winding and the iron core and fills a gap between the winding and the iron core; the insulating limiting plate and the iron core are coaxially arranged; the insulating supporting plate and the insulating limiting plate are made of high-dielectric-constant materials. And an insulating partition plate is arranged between the primary winding and the secondary winding. The invention aims to solve the problems that a cantilever beam structure is large in stress, poor in heat dissipation performance and large in boundary dimension, and a voltage-sharing capacitor needs to be arranged.

The utility model provides performance improvement energy-saving equipment based on a sand sucker, and relates to the technical field of improvement energy-saving equipment, the performance improvement energy-saving equipment comprises a sand storage cylinder and a lifting channel, the upper part of the sand storage cylinder is provided with an upper fixing sleeve, the upper fixing sleeve is sleeved with a feed hopper, the upper part in the sand storage cylinder is provided with an upper screen cylinder, and the lower part of the sand storage cylinder is provided with a discharge hopper; a discharging pipe opening is formed in the lower portion of the discharging hopper, vibration motors are installed on the left portion and the right portion of the outer ring face of the discharging hopper, a lifting channel is connected to the right portion of the discharging hopper, a supporting frame is fixed to the middle of the lower portion of the lifting channel, and the supporting frame is fixed to a supporting leg on the right side. And a rotating shaft rotationally moves in the center in the lifting channel. According to the utility model, the feeding quantity is large, the sand is secondarily filtered through vibration, the filtered fine sand is easier, smoother and faster to lift, the situation that the sand is slowly lifted and conveyed due to the coarse sand is avoided, and the device is more energy-saving, efficient and practical.

A brake handle with a dynamically variable rotation center in the braking process comprises a brake shell, a piston assembly, a push rod assembly, a brake handle, a multi-fulcrum linkage component and a rotation switching mechanism. The shell is provided with a piston cavity. The handle drives the piston to move through the push rod. The linkage component is provided with two rotating fulcrums, and the switching mechanism can switch two working states. When the front section of the handle is pinched, the handle rotates around the first fulcrum, idle stroke is eliminated, and operation is labor-saving. When the rear section is pinched, the second fulcrum is switched to rotate, and the lever ratio is increased to improve braking force. By means of automatic switching of double fulcrums, labor-saving control and large braking force output are both considered, and the problem that a traditional hydraulic brake handle is poor in performance is solved; the modular structure is easy to adapt to mass production, and switching nodes are accurate and controllable; a locking and failure protection structure is arranged, so that the operation is stable and safe; meanwhile, eccentric wear of parts is eliminated, the service life of sealing pieces is prolonged, and braking efficiency and use safety are improved.

The present invention belongs to the technical field of ceramic products, and in particular to a ceramic product glazing device and a method of use, comprising a glazing bracket and a glaze slurry box fixed below the glazing bracket, a glazing mechanism is arranged between the glazing bracket and the glaze slurry box, the glazing mechanism comprises a clamping and rotating assembly, a glaze injection and lifting assembly and a posture changing assembly, a clamping and rotating assembly is arranged directly above the glaze slurry box, a glaze injection and lifting assembly is arranged between the clamping and rotating assembly and the glazing bracket, and a posture changing assembly is arranged on the surface of the clamping and rotating assembly. By providing the glazing mechanism, the device can perform glazing operations without manual handheld clamps, while reducing direct contact between the human body and the glaze slurry during the glazing process, ensuring that the health of the practitioners is not damaged, and the whole process is automated, which greatly reduces the human contact and participation, not only improves the efficiency, but also improves the quality and productivity of ceramic products.

This utility model discloses a corrosion-resistant hard alloy forming mold, belonging to the field of mold technology. It includes: a shell, a worktable fixedly installed at the bottom of the shell, a lower mold movably abutting at the top of the worktable, a hydraulic cylinder fixedly installed at the top of the shell, a connecting block fixedly installed at the output end of the hydraulic cylinder, a spiral ring threadedly connected to the outer side of the connecting block, an upper pressing block threadedly connected to the inner side of the spiral ring, and an upper pressing block fixedly installed at the bottom of the upper pressing block. A lifting block is slidably installed inside the worktable. This utility model, through the cooperation of multiple structures, can clamp components to ensure that the lower mold does not move during the pressing process, improving the quality of the formed product. The heating component can heat the alloy material, enabling uniform heating, improving its plasticity, which is beneficial for pressing. Furthermore, the material is transferred into the device, and through the cooperation of multiple structures, the lifting block moves upward, ejecting the formed product from the lower mold. Operation is simple and convenient, improving production efficiency.

The utility model discloses a self-adaptive mounting structure for a composite target plate and a base plate, and belongs to the technical field of target plate mounting, the self-adaptive mounting structure comprises a mounting seat arranged on the base plate and a mounting hole formed in the target plate, and the mounting seat and the mounting hole are correspondingly arranged and are connected through a bolt and a pressing cap; the pressing cap is located on the side, away from the base plate, of the target plate, a bolt hole for the bolt to penetrate through is formed in the pressing cap in the axis direction of the pressing cap, the bolt penetrates through the bolt hole and the mounting hole and is connected with the mounting base, threads are formed in the mounting base and used for being in threaded connection with the bolt, and the pressing cap buckles the target plate through the fastening force of the bolt. By improving a mechanical structure, stress concentration is reduced or eliminated, the installation state of an armored product is restored, and the target test requirement is met.

The utility model relates to medical equipment technical field, concretely disclose a surgical position fixing frame, including operating bed body, controlling means, buzzer and timer, still include: position fixing subassembly, position fixing subassembly is provided with two groups, is arranged respectively at the outside both sides of operating bed body, and the setting of position fixing subassembly is used for fixing the hand of patient, position fixing subassembly includes rack, gear and connecting frame respectively, connecting frame does linear motion along rack, and the fixed position of hand is flexibly adjusted, medical staff can flexibly adjust the position of hand fixed according to the operation demand, improve the adaptability and flexibility of operation, the inflation of air bag can provide uniform fixing force, avoid the local compression and blood circulation that traditional restraint belt can cause are not smooth, medical staff can adjust the inflation of air bag and the position of moving connecting frame according to the actual situation in the operation process through controlling means at any time, avoid long -term oppression same position.

The utility model discloses a clamping device for energy-saving transformation of a hydraulic server, and relates to the technical field of servo hydraulic machines, the clamping device comprises a base, the upper surface of the base is fixedly connected with a workbench, the upper surface of the base is provided with a clamping mechanism, the clamping mechanism comprises two first collecting groove plates, and the two first collecting groove plates are fixedly connected with the workbench. The device comprises a base, two first collecting groove plates are fixedly connected to the upper surface of the base, first connecting plates are mounted on the inner walls of the two first collecting groove plates, first mounting plates are fixedly connected to the sides, away from each other, of the two first collecting groove plates, and first electric telescopic rods are fixedly connected to the upper surfaces of the first mounting plates; and the first electric telescopic rod is fixedly connected to the inner wall of the first collecting groove plate. According to the clamping device for energy-saving transformation of the hydraulic server, the problem that after a hydraulic machine is used for machining a workpiece, the surface of a workbench is often difficult to clean, and the cleaning efficiency of the workbench is low is solved.

The present invention relates to a variable structure quick lifting device, which is used for the transportation of 3DP components. The variable structure quick lifting device comprises: a cushion block, and an adjustable platform detachably connected to the bottom of the cushion block; the upper end face of the cushion block is designed to conform to the shape of the 3DP component and is used to support the 3DP component; the cushion block is printed together with the 3DP component, and a gap is reserved between the cushion block and the 3DP component (3); the adjustable platform is placed on the lower end face of the cushion block after printing. The variable structure quick lifting device can design the shape of the upper end face of the cushion block according to the shape of the 3DP component. The cushion block designed to conform to the shape can form a self-locking with the 3DP component as a whole, and the transportation process maintains a good stability. In addition, the cushion block and the adjustable platform can be quickly assembled and disassembled, which is convenient for the transportation of large components.

The present invention relates to an automatic locking stepless locking device and a locking method thereof, which belongs to the technical field of stepless locking, and solves the problems of easy loosening and low automation of existing stepless locking devices. The present invention comprises: a ratchet rod, a threaded rod, a pawl, a spring and a pawl mounting assembly; the ratchet rod is slidably mounted on the threaded rod; a plurality of parallel pawl grooves are provided on the ratchet rod; the pawl can be inserted into the pawl groove of the ratchet rod; the pawl is connected to the threaded rod through the pawl mounting assembly, and the pawl can synchronize the displacement of the threaded rod; when the ratchet rod and the threaded rod slide relative to each other, the pawl can switch different pawl grooves for engagement; when the spring is extended and retracted, the pawl can be inserted into the pawl groove or slide out of the pawl groove. The present invention realizes automatic stepless locking and can maintain a stable and reliable locked state.

The utility model discloses a positioning device for a shoulder backup plate, which comprises a supporting boss and a first positioning piece, the supporting boss is provided with a first supporting surface and two second supporting surfaces, the first supporting surface is a horizontal surface with a trapezoidal structure and is used for abutting against the front surface of a first plate surface of the shoulder backup plate, and the second supporting surface is used for abutting against the front surface of a second plate surface of the shoulder backup plate. The two second supporting faces are inclined faces of triangular structures, oppositely arranged on the two sides of the first supporting face and used for abutting against the front faces of the second plate faces of the corresponding shoulder backup plates. The first positioning piece is of a U-shaped structure and is arranged on the supporting boss in a surrounding mode. The positioning tool has the advantages that the positioning tool is used for positioning the shoulder backup plate of the structure, positioning of the shoulder backup plate can be firmer, the shoulder backup plate cannot move in the punching and edge cutting process, the positioning effect on the shoulder backup plate is improved, and therefore punching and edge cutting efficiency is improved.

The utility model relates to the technical field of film production discloses a plastic film static eliminator, including adjusting mechanism, elevating system and fixed establishment. The utility model discloses when the electrode pipe is electrified to produce positive and negative ions, the motor drives the fan blade to rotate to produce wind energy to make the ion be sent to the film surface, and the user drives the rotating rod to rotate through the handle simultaneously, and the rotating rod rotates with fixed block and fixed block no.

The utility model provides a workpiece inspection measuring tool, which comprises a mounting seat and a handheld seat, a plurality of through grooves with different sizes are arranged on the surface of the mounting seat, measuring rulers are arranged in the through grooves in a sliding manner, a push plate is mounted at one end of each measuring ruler far away from the mounting seat, the handheld seat is positioned on one side of the mounting seat, and the handheld seat is positioned on the other side of the mounting seat. The hand-held seat is fixedly connected with the mounting seat through a connecting rod, the measuring ruler is sleeved with a reset spring, one end of the reset spring is fixed on the surface of the mounting seat, and the other end of the reset spring is fixed on the surface of the push plate. The problems that the existing needle gauges are inconvenient to use, and when valve needle holes with different sizes are measured, workers need to rummage needle gauges with corresponding sizes from a tool box, which is very troublesome are solved.

The invention relates to the technical field of PCB end riveting, and discloses PCB end riveting equipment and a riveting method thereof, the PCB end riveting equipment comprises an equipment box body, and a riveting workbench is fixedly connected right above the equipment box body. Through the arrangement of the pressing fixing mechanism, after a to-be-machined PCB is installed, a hydraulic rod is started to drive a pushing plate to slide downwards along a sliding rod, the pushing plate slides downwards to drive a plurality of riveting heads on a riveting base to slide downwards, the pushing plate drives racks at the two ends to slide downwards, the racks drive gears to rotate, and the gears drive fixing lead screws to rotate; at the moment, a fixed screw rod drives a sliding extrusion plate to move towards one end close to the to-be-processed PCB along the inner wall of the riveting workbench, the sliding extrusion plate moves to extrude an extrusion spring, the extrusion spring is extruded and contracted, the contraction elastic force of the extrusion spring is increased, and the extrusion force of the extrusion spring on a fixed plate II is increased; through the arrangement, the clamping force of the second fixing plate on the edge of the to-be-machined PCB can be increased.

The utility model provides a fixed frame gripping device with a spectacle lens elastic clamp, which is used for gripping a fixed frame, the fixed frame is provided with a horizontally arranged cross rod and a vertically arranged vertical rod, and the upper end of the vertical rod is fixedly connected with the lower end of the cross rod; the upper end of the grabbing plate is fixedly connected with the driving end of a manipulator; a first pneumatic finger and a second pneumatic finger are arranged on the grabbing plate; the driving end of the first pneumatic finger is provided with a first clamping block and a second clamping block. When the first clamping block and the second clamping block are closed, a U-shaped limiting groove with an upward opening is formed, and the transverse rod is inserted into the limiting groove. The driving end of the second pneumatic finger oppositely clamps the vertical rod; the clamping direction of the driving end of the first pneumatic finger is perpendicular to the clamping direction of the driving end of the second pneumatic finger. Under the common limiting effect of the first pneumatic finger and the second pneumatic finger, the movable space of the fixing frame in the horizontal direction is eliminated, the position of the fixing frame is kept stable, and displacement is avoided.

The utility model provides a sofa with a sleeve cushion fixing mechanism, which relates to the technical field of sofas with sleeve cushion fixing mechanisms, and comprises a sofa, a fixing device arranged on the surface of the sofa, an anti-shifting device arranged on the surface of the sofa, a sleeve cushion arranged on the surface of the sofa, and a cushion arranged on the surface of the sofa. The fixing device comprises a clamping block fixedly connected to the surface of the sofa backrest, the surface of the clamping block is fixedly connected with a clamping ring, the surface of the clamping block is sleeved with a buckle, the inner wall of the buckle is provided with an annular groove, the annular groove is in interference fit with the clamping ring, the surface of the clamping block is provided with a circular groove, the interior of the buckle is fixedly connected with a clamping rod, and the clamping rod is fixedly connected with the surface of the sofa backrest. A first hook-and-loop fastener is fixedly connected to the side face of the sofa, a hook-and-loop fastener is fixedly connected to the side, close to the sofa, of the sleeve cushion, the first hook-and-loop fastener and the hook-and-loop fastener are mutually bonded, and the problem that the sleeve cushion is prone to slipping off from the sofa is solved.

A positioning and clamping tool for the upper edge of a machine tail movable part comprises a bottom plate, a jacking part and an end face positioning block. A side protection plate is vertically arranged on the bottom plate, an adsorption disc is installed on the side protection plate, the end positioning block is arranged at one end of the bottom plate, so that the side protection plate and the end positioning block form an L shape, the jacking parts are evenly distributed in the transverse extending direction of the side protection plate, each jacking part can independently ascend and descend, and each jacking part sequentially ascends in an echelon mode from one side of the end positioning block. The invention further provides a machine tail movable upper edge machining method. The jacking part is used for supporting the upper edge of the to-be-machined movable part, the arc of the upper edge of the to-be-machined movable part is matched with the arc formed by the jacking part, the upper edge of the to-be-machined movable part is adsorbed and fixed through the adsorption disc, and it is guaranteed that a workpiece cannot move in the cutting process; by means of supporting of the jacking part and matching of positioning and adsorption of the adsorption disc, the problem of machining reference is solved, the machining precision of holes is ensured, the size of an operation gap of the scraper is ensured, and the situation that the scraper is scraped and clamped is avoided.

The application relates to the technical field of hot riveting machines, and discloses a plastic multi-point hot riveting device with detachable hot riveting heads, which comprises a heat-conducting pressure head, two groups of heating coils are respectively arranged on the two sides of the heat-conducting pressure head, three groups of thermocouples are arranged on the front side of the heat-conducting pressure head, a heat spreading plate is arranged in the heat-conducting pressure head, a plurality of connecting pieces are arranged below the heat spreading plate, a hot riveting head is arranged in each connecting piece, and the upper end of each hot riveting head is in abutment with the heat spreading plate. The application guarantees the consistency of hot riveting machining precision: the heat spreading plate provides a unified installation reference for the hot riveting heads, the locking structure ensures the stability of the reference precision; the trigger ring and the locking ring realize synchronous action through the cooperation of a limiting groove-limiting block, the trigger rod accurately slides along a preset sliding groove track, the accurate transmission of the unlocking and locking actions is guaranteed, the installation height and stress balance of the hot riveting heads are ensured, and the consistency of hot riveting finished products is improved.

The utility model relates to the technical field of dispensing, and discloses a drip-proof dispensing device for electronic components and electromechanical component equipment, which comprises a bottom plate, the top of the bottom plate is fixedly connected with a placing plate, the top of the placing plate is provided with a fixing mechanism, and the left and right sides of the top of the bottom plate are fixedly connected with fixing blocks. A rectangular groove is formed in the right side of the fixing block, and a dispensing mechanism is arranged in the rectangular groove. Through the glue dispensing mechanism, the tank body is moved to the position above the electronic component or the electromechanical component equipment through the hydraulic cylinder, the disc moves downwards through work of the motor, glue in the tank body is extruded, glue dispensing is conducted on the electronic component or the electromechanical component equipment, then the disc moves upwards through work of the motor, and glue dispensing is conducted on the electronic component or the electromechanical component equipment. Due to the factor of the sealing ring, negative pressure can be formed in the tank body, so that the glue is driven to move upwards, and further, the glue cannot drip out of the discharging pipe.

The invention discloses automatic welding equipment special for maintenance and replacement of electric heating elements of voltage stabilizers, and relates to the technical field of welding equipment for maintenance of the electric heating elements of the voltage stabilizers. The automatic welding equipment comprises a machine head shell, and a machine head clamping mechanism, a walking transmission mechanism, a welding machine head module and a wire feeding mechanism are arranged on the machine head shell; the machine head clamping mechanism is used for fixing the automatic welding equipment to a to-be-welded area, the walking transmission mechanism is used for driving the automatic welding equipment to rotate and move along a welding seam path, and at least four driving shafts are arranged in the automatic welding equipment to achieve the main rotation function, the arc length adjusting function, the welding seam swinging function and the wire feeding driving function correspondingly. The wire feeding mechanism is fixed to the machine head shell, and the whole rotation space of the automatic welding equipment is controlled within 160 mm. The full-automatic welding machine has the effect of achieving stable, high-precision and full-automatic welding of 2G position welding seams (butt joint / angle joint) between the electric heating element and the sleeve in a high-irradiation environment in an ultra-narrow rotation space smaller than or equal to 160 mm.

The utility model relates to teaching appliance technical field discloses a magnetic deflection trajectory teaching protractor, include: protractor body, any one end of protractor body both ends still is provided with the protruding block, the protruding block inboard still is provided with fixed point subassembly, the fixed point subassembly center with protractor body edge place is tangent, when fixed, protractor body can rotate along the axis of fixed point subassembly to show particle magnetic deflection trajectory, the teaching protractor of this application can quickly delineate the trajectory of particle magnetic deflection, and the operation is simple relying on the rotating process of rotating protractor, since having fixed point, will not happen removal, rotates more accurate, and uses rotation to handle the trajectory problem of charged particle movement in complex field, need not draw multiple circles in the same figure, let the drawing be clearer.

The present invention relates to the field of numerical control machine tools, and in particular to a turning, grinding and milling composite machining numerical control machine tool, comprising a workbench and a composite machining unit, wherein the composite machining unit comprises a machining stabilizing component arranged on the workbench, and a composite machining component arranged on the workbench; the machining stabilizing component comprises a supporting shell arranged on the workbench, a power component arranged on the supporting shell, a movable component arranged on the supporting shell, a clamping component arranged on the movable component, and a fixing component arranged on the supporting shell; the composite machining component comprises a fuselage arranged on the workbench, an electric cylinder arranged on the workbench, a track arranged on the workbench, and a composite machining component arranged on the fuselage, wherein the stable clamping of a rod-shaped special-shaped workpiece is achieved by the cooperation of the movable component and the clamping component, so that when the device performs composite machining on the workpiece through the composite machining component, the workpiece does not move, thereby improving the machining accuracy.

The utility model provides a kind of high load's aluminum alloy photovoltaic frame, it is related to aluminum alloy photovoltaic frame technical field, including first frame, the side of first frame is equipped with second frame, the outer surface of first frame is sleeved with fixed buckle, the outer surface of fixed buckle is fixedly connected with clamping plate, the outer surface of clamping plate is equipped with screw hole, the inner wall of screw hole is sleeved with fixed screw rod, the outer surface of fixed buckle is fixedly connected with fixed frame, the inner wall of fixed frame is sleeved with limit rod.The utility model, fixed buckle is fixed to first frame and second frame, guarantee the load capacity of frame, by fixed screw rod and screw hole thread connection, realize the connection of fixed buckle and first frame, increase the compactness of the connection of two, by fixed frame provide an installation environment for other components, after fixed buckle and frame are clamped well, by the rebound of spring drive L plate inside L groove sliding, to frame clamping.

The utility model relates to the technical field of flat cable processing, and discloses a flat cable processing branching device which comprises a storage bin, protective covers are arranged at the left end and the right end of the storage bin, the inner walls of the protective covers are rotationally connected with the left side face and the right side face of the storage bin, a top cover is arranged above the storage bin, a fixing mechanism is arranged below the top cover, and a branching mechanism is arranged in the storage bin. The fixing mechanism comprises an adjusting part and a fixing part, the branching mechanism comprises a branching part and a placing part, the adjusting part comprises a connecting plate, the bottom surface of the connecting plate is fixedly connected with the top cover, and connecting rods are fixedly arranged on the front side face and the rear side face of the connecting plate; the fixing roller fixes the flat cables in the containing groove, it is guaranteed that the flat cables cannot move in the containing groove to cause winding of the flat cables, meanwhile, the telescopic rod stretches out and draws back to drive the connecting base and the fixing roller to move, the fixing roller can fix the flat cables of different sizes, and the applicability of the device is improved.

The utility model discloses a kind of car central control rotary screen structure, including mounting substrate and central control screen, the elliptic arc opening is opened in the mounting substrate, and vertical fixed with guide rod, slidingly cooperate with slider on guide rod, the elliptic arc opening is engaged with gear, gear and connecting rod one end are hinged, connecting rod other end and slider are hinged, central control screen back and connecting rod are connected.The utility model can realize the rotation function of car central control screen, and can effectively avoid the interference problem caused by tangential movement in screen rotation process.

The utility model discloses an environmental protection type cleaning machine, including ultrasonic cleaning machine body, the top of ultrasonic cleaning machine body is provided with environmental protection subassembly, and the both sides of ultrasonic cleaning machine body are provided with stability subassembly respectively, environmental protection subassembly is including top cover no.

The utility model provides a house building frame column formwork reinforcing device which comprises a frame column, bottom blocks are arranged at the four right-angle positions of the bottom of the frame column, a first telescopic plate is installed between the two bottom blocks on the same side of the bottom of the frame column, an unfolding assembly is arranged at the top of each bottom block, and each unfolding assembly comprises a right-angle block. A right-angle block of an unfolding assembly can adjust the unfolding distance according to the height of a frame, so that a third telescopic plate and the right-angle block can be attached to different positions of a frame column for multi-point reinforcement, the tightening effect of the telescopic plates on the three sides is enhanced through linkage of an insertion barrel and a binding rope, the front end is convenient to mount and dismount through the binding rope, and meanwhile when the binding rope is wound by the insertion barrel, the binding rope is not prone to falling off. And the first telescopic plates of the bottom blocks can be driven to descend to make contact with the ground, so that the stability of the device is kept, the device cannot move, through cooperation of the multiple telescopic plates, the device can be used for reinforcing frame columns with different lengths, widths and heights, and the applicability is higher.