28results about How to "High displacement accuracy" patented technology

The invention discloses a vibrating wire strain gauge automatic calibration device with a force value monitoring function, and relates to the field of measuring instrument calibration, the vibrating wire strain gauge automatic calibration device comprises a fixing assembly fixedly connected to a bottom plate, the fixing assembly comprises a first fixing frame and a second fixing frame which are arranged at an interval in the length direction of the bottom plate, and two guide shafts are connected between the two fixing frames; moving assemblies are arranged on the two guide shafts in a linear reciprocating sliding mode. The moving assembly and the first fixing frame are oppositely provided with at least one pair of clamping assemblies which are matched with each other, and the clamping assemblies are used for clamping a to-be-tested vibrating wire strain gauge. The side, facing the first fixing frame, of the moving assembly is connected with a displacement sensor, and the side, deviating from the first fixing frame, of the moving assembly is connected with a driving assembly driving the moving assembly to be close to or away from the first fixing frame. The vibrating wire strain gauge calibration device and method have the advantages of large output force value, high displacement precision, high calibration speed, good safety performance, high applicability and the like, and can meet the calibration requirements of vibrating wire strain gauges of different sizes.

The invention provides a steering hydraulic system which is characterized in that the system comprises a power unit, the power unit is connected with a plurality of damping hydraulic cylinders so as to provide power hydraulic oil for the damping hydraulic cylinders, and a control oil way of each damping hydraulic cylinder comprises a displacement closed-loop control oil way and a hydraulic cylinder damping oil way; pressure sensors are arranged in control oil ways of the damping hydraulic cylinders to monitor oil way pressure values in real time, and the electric control unit is in signal connection with the pressure sensors so as to correspondingly switch the control oil ways of the damping hydraulic cylinders according to the real-time oil way pressure detected by the pressure sensors. Therefore, different corresponding control oil ways are selected for the hydraulic system according to different vehicle running conditions.

The invention discloses a full-automatic horizontal machining center, and belongs to the technical field of machine tools, the full-automatic horizontal machining center comprises a square frame, a cutter feeding system, a cradle, a left supporting seat, a right supporting seat, a servo rotation driving device and a brake device, the cutter feeding system is arranged on the square frame, the cradle is used for clamping and bearing a machined workpiece, and the left supporting seat is arranged on the right supporting seat; the left supporting seat and the right supporting seat are arranged at the left end and the right end of the square frame, a left supporting shaft on the cradle is installed on the left supporting seat through a bearing, a right supporting shaft on the cradle is installed on the right supporting seat through a bearing, the left supporting shaft and the right supporting shaft are coaxially installed, and the servo rotation driving device is used for driving the left supporting shaft to rotate. The brake device is used for limiting rotation of the right supporting shaft. The cradle is of a latticed frame plate structure made of materials which are light in weight and high in bearing capacity. According to the cradle, the latticed frame plate structural design is adopted, a horizontal rotating system of the cradle is moved away, the weight of the cradle is greatly reduced, the moving inertia is reduced, the displacement precision of the cradle is improved, and therefore the machining precision and stability of the machining center are improved.

The utility model discloses a lifting detection device of a screw rod type lifting system, which relates to the technical field of screw rod type lifting systems and comprises a rack, a plurality of groups of spiral lifting mechanisms are fixedly mounted on the rack, and a differential Hall sensor is arranged below any group of spiral lifting mechanism. According to the design scheme, through the design that the differential Hall sensor is arranged below any group of spiral lifting mechanisms, the chip box is matched with the magnet to detect the rotating angle value of any group of lead screws and output A and B orthogonal pulses, and the lifting height of the platform can be calculated according to the number of turns of rotation of the lead screws; due to the fact that the maximum eccentric value of the induction center of the chip box and the rotation center of the magnet is 0.3 mm, the installation precision of the differential Hall sensor is low, installation is easy and convenient, the production cost of equipment is reduced, the lead screw is directly detected, accumulated errors generated by a transmission mechanism are avoided, and the displacement precision of the platform is effectively improved.

The utility model relates to a knife sharpening technical field, and disclose an automatic knife sharpening device, including the knife rest of installation for the knife edge part of cutting knife is used to the knife sharpening assembly of grinding, the knife sharpening assembly includes the electromagnet and the knife sharpening stone of knife rest installation through the knife sharpening support, the knife sharpening stone is opposite with the knife edge part of cutting knife and is adjusted the interval of both through the electromagnet, the utility model discloses the interval of the knife sharpening stone and cutting knife is adjusted through the electromagnet, when electrifying, electromagnet core drives push rod and makes the knife sharpening stone close to the knife edge, after power off, reset under the spring action, need not stop the machine to complete grinding, can greatly shorten the knife sharpening time to improve equipment utilization and processing efficiency, and then improve actual capacity, also avoid the body injury and the dust inhalation etc. safety hidden danger brought by manual stop operation simultaneously.

The present invention belongs to the technical field related to fluid regulating valves, and discloses a design and flow calculation method for a parabolic valve core in a flow regulating valve. The method comprises: S1 constructing a relational expression of the flow area of ​​the flow regulating valve corresponding to different valve core displacements; S2 constructing a geometric relational expression of the flow area according to the geometric structure of the throttle valve and the valve core, and obtaining a relational expression satisfied by the cross-sectional profile of the valve core; S3 discretizing the displacement ratio into multiple values, calculating the flow area corresponding to different displacement ratios, calculating the coordinates of the points on the valve core profile at different displacement ratios, fitting the points on the valve core profile at all displacement ratios into a parabola, and the parabola rotates around the central axis of the valve core to obtain the required rotational parabolic curve of the valve core. The present invention also discloses the application of the above method. Through the present invention, the deformation problem of the valve stem under the radial impact force of the fluid and the problem of inconsistent flow regulation resolution at different valve stem positions of the regulating valve are solved.

The utility model discloses a kind of spraying devices of silicon-carbon rod, it is related to silicon-carbon rod processing technical field, including bottom plate, the upper end left part fixed mounting of bottom plate has spraying structure, the upper end right part fixed mounting of bottom plate has feeding adjustment assembly, the inside movable joint of feeding adjustment assembly has multiple point fixed assembly, feeding adjustment assembly includes two guide rails, the lower end of two The front position fixed mounting of right part of bottom plate lower end. The spraying device of silicon-carbon rod in the utility model, by feeding adjustment assembly, can be driven by electric cylinder driving support plate with fixed cylinder linear movement, so that fixed cylinder will its inner wall fixed silicon-carbon rod send into spraying frame and spray aluminum. Electric cylinder replaces manual adjustment, improves displacement accuracy, and also reduces the risk of manual operation. By multiple point fixed assembly, the silicon-carbon rod hot end can be fixed using the embracing type fixing method of four arc clamps, realize multiple point fixing, and have strong stability.

The invention belongs to the technical field of textile machinery, and relates to an automatic winding machine. The multi-station electronic yarn guiding device comprises a winding machine main frame, a material pipe feeding disc is arranged on the winding machine main frame, a material pipe vertical frame used for vertically arranging and fixing a plurality of material pipes is arranged at the tail of the material pipe feeding disc, a multi-station electronic yarn guiding device is arranged on the winding machine main frame, and the multi-station electronic yarn guiding device comprises a fixing support, a main shaft support and a tailstock support. The spindle support is provided with a plurality of yarn bobbin spindle units capable of rotating synchronously and a winding motor set used for driving the yarn bobbin spindle units to rotate, and the tailstock support is provided with a yarn bobbin jacking structure capable of doing reciprocating rectilinear motion along the end close to or away from the yarn bobbin spindle units. Full-automatic design is adopted, automatic material preparation, feeding, material clamping, multi-head synchronous yarn guiding, multi-strand yarn tension control and multi-strand yarn breakage monitoring are achieved, the labor intensity of workers is greatly reduced, and the production efficiency is improved.

The present invention provides a bending test device and a test method for an OLED screen, comprising a cabinet and a bending mechanism, wherein the bending mechanism comprises a moving device, a placing platform, a bending device and a tension sensing device, wherein the placing platform comprises a first platform and a second platform, which are used to fix the two ends of the OLED flexible screen, wherein a moving device, a bending device and a tension sensing device are arranged between the first platform and the second platform, wherein the bending device is fixed on the moving device, wherein the bending device comprises a bending roller, wherein the tension sensing device comprises a tension sensor, a tension control shaft and an angle control shaft, wherein the angle control shaft is located below the bending roller and on one side of the tension control shaft, wherein the two ends of the tension control shaft are connected to the tension sensor and fixed on the moving device to achieve left and right movement. The present invention provides a bending test device and a test method for an OLED screen, wherein the bending test efficiency is higher, the experimental results are more stable and objective, the displacement accuracy is high, and the versatility is strong.

The invention belongs to the technical field of magnetic suspension, and particularly relates to a stator structure and a bearingless magnetic suspension motor. The stator structure is applied to the magnetic suspension device and comprises a suspension assembly and a torque assembly, the suspension assembly and the torque assembly are arranged at intervals in the axial direction of the stator structure, the suspension assembly comprises a suspension iron core and a suspension coil, and the torque assembly comprises a torque iron core and a torque coil; the suspension iron core comprises a plurality of first winding teeth distributed at intervals in the circumferential direction of the suspension iron core, each first winding tooth is provided with a suspension coil, the torque iron core comprises a plurality of second winding teeth distributed at intervals in the circumferential direction of the torque iron core, and each second winding tooth is provided with a torque coil. After the structure is adopted, the suspension magnetic circuit and the torque magnetic circuit do not interfere with each other, the control is simple, the torque is increased, the shaft diameter ratio of the rotor is increased, the overturning stability can be improved, and the problem that the control precision of an existing magnetic suspension device on the rotor is low can be solved.

The invention discloses a roll bending cylinder replacement device and method for a hot continuous rolling production line, which is applied to the field of hot continuous rolling production lines, and comprises a support frame, a hanger plate and a connecting plate, the hanger plate is mounted on a rolling mill main frame, and the connecting plate is fixedly arranged on the hanger plate; one end of the cross beam is mounted on the support frame, and the other end of the cross beam is mounted on the connecting plate; the first rail trolley and the second rail trolley are both movably arranged on the cross beam and can slide in the extending direction of the cross beam; the first hoisting component is mounted on the first rail trolley and is used for hoisting the roll bending cylinder; the second hoisting component is mounted on the second rail trolley and is used for leveling the roll bending cylinder; and the driving part is alternatively arranged on the first rail trolley or the second rail trolley. According to the roller bending cylinder replacing device, the whole roller bending cylinder replacing process is more reasonable, the operation difficulty is effectively reduced, and the overhauling quality is guaranteed; the safety risk caused by replacing the bending roller cylinder by hoisting the carrying pole beam can be effectively eliminated, and the accident potential is eliminated.

The invention relates to the field of metal machining, in particular to a metal part machining linear cutting device which comprises a lifting table, a base is arranged on the lifting table and can do reciprocating motion in the transverse direction of the lifting table, a base plate is arranged on the upper surface of the base, and a plurality of V-shaped containing grooves are transversely formed in the upper surface of the base plate; according to the machining device, the workpiece serves as a movable part, the cutting line serves as a fixed part, machining of a plurality of machining points through the cutting line can be achieved only by moving the bottom plate and the lifting table, and parts for achieving displacement of the machining points are installed on the lifting table and the base, that is, the vertical lead screw, the transverse lead screw motor and the motor part are installed on the lifting table and the base; the stable movement of a workpiece can be realized, the displacement precision of a machining point is improved, meanwhile, when a cutting line is replaced or the cutting machine body is maintained subsequently, only the lifting table needs to be controlled to move downwards, the base is far away from the cutting machine body, and the cutting machine body is located at a lower position so as to facilitate the operation of a worker.

The present application discloses a phased array radar test system and a method for testing the phased array radar, comprising a darkroom and a central control system. A partition is arranged in the darkroom, a simulation area and an interference area are arranged on one side of the partition, and a test area for the phased array radar is arranged on the other side. The darkroom comprises a first wall and a second wall arranged opposite to each other; the simulation area is arranged close to the first wall, and the test area is arranged close to the second wall; the simulation area comprises a simulator, a guide rail device and a simulation table built under the guide rail device, and the simulator is arranged on the guide rail device; the test area is provided with a loading platform, and the loading platform is used to load the phased array radar; the interference area is provided with an interference source; the central control system comprises a central control computer, and the central control computer is control-connected with the guide rail device; the central control computer is control-connected with the interference source; and the central control computer is electrically connected with the loading platform.

The invention relates to a weight anti-swing device of a torque standard device, which comprises a weight loading table and a weight frame, a connecting column is arranged at the lower end of the weight frame, a matching hole capable of being in clearance fit with the connecting column is formed in one end of the weight loading table, and the weight anti-swing device further comprises an anti-swing mechanism; a base of the anti-swing mechanism is fixed below the weight loading table, two clamping pincers can slide relatively, eccentric wheels are arranged on the outer sides, away from each other, of the clamping pincers, the clamping pincers can slide in the direction close to or away from the clamping hole by rotating the eccentric wheels, a sliding block is further arranged in the base, and the sliding block is further connected with a driving mechanism for driving the sliding block to move in the length direction of the sliding block. Through clearance fit between the connecting column and the matching hole, the weight frame and the weight are ensured to be in a completely free state after the weight is loaded or unloaded; in the loading process of the weight, the device is prevented from being affected by the surrounding environment through the anti-swing mechanism, and the technical problem that the metering precision is affected due to the fact that the weight frame shakes due to trace sound waves and airflow after being clamped can be solved.

The present invention provides an OLED screen test bending machine, including a cabinet, a bending mechanism and a pressure sensor, the cabinet is provided with a bending mechanism and a pressure sensor, the bending mechanism includes a ballast platform, a placement platform and a moving device, ballast platforms are provided on both sides of the placement platform, the moving device includes a plurality of moving components, namely a lateral moving component and a longitudinal moving component, the ballast platform is connected with the lateral moving component to realize the left and right movement of the ballast platform, the placement platform is connected with the longitudinal moving component to realize the up and down movement of the placement platform, the pressure sensor is located below the placement platform, and is used to test the pressure when the OLED screen is bent. The present invention provides an OLED screen test bending machine, which has strong versatility and can realize bending on both sides, has higher bending experiment efficiency, more stable and objective experimental results, and is compatible with a large span of OLED screen sizes.

The embodiment of the application provides a rigid workpiece bevel exposure device, which is used for improving the precision of a laser direct writing imaging device. The rigid workpiece is driven by a harmonic reducer to perform linear stepping motion, and a light source module performs linear scanning operation in the vertical direction of the linear stepping motion, without the light source module moving in the horizontal and vertical directions at the same time, thereby avoiding vertical position errors caused by multiple scanning motions and improving the precision of exposure imaging. Secondly, the scanning motion carrier and the roller driving system are both installed on the first bevel of the base, so that the feeding and discharging are both in the form of bevel feeding and discharging, thereby avoiding the rigid workpiece occupying too large horizontal space in the horizontal direction when feeding and discharging in the horizontal direction, and saving production space. Finally, the device adopts a harmonic reducer as a transmission structure, which is small in size, light in weight and simple in structure, and the backlash of the harmonic reducer is generally within 1 arc minute, so that the high-precision stepping of the rigid workpiece can be ensured, and the imaging precision is further improved.

The present invention belongs to the technical field of cable tie machines, and discloses a cable tie machine with a special-shaped cable tie feeding mechanism, comprising a cable tie box body and a special-shaped cable tie main body, the cable tie box body is composed of a top plate processed by the cable tie machine and an inner plate processed by the cable tie machine, a spiral automatic feeding box is provided on one side of the inner plate processed by the cable tie machine, and also includes: a cable tie conveying assembly, which is arranged on one side of the top end of the inner plate processed by the cable tie machine, and the cable tie conveying assembly is connected to the spiral automatic feeding box; an automatic cable tie assembly, which is arranged on the other side of the top end of the inner plate processed by the cable tie machine; the present invention can realize automatic cable tying, and the cable tying operation for small products is extremely accurate and stable with small errors, and can realize precise cable tying, effectively saving the raw materials of the cable tie, and is not only very stable when packaging the product, but also reduces the looseness and shaking of the product, and will not cause excessive squeezing to the product, so that the cable tie operation has a high sales volume and is very convenient to use.

The invention relates to a bolt and nut fastening device for automobile machining, which comprises a quick-insertion type locking mechanism, and the quick-insertion type locking mechanism comprises a locking motor, a locking main driving rod, a transition sleeve, a replacement transition rod and a disassembly sleeve; one end of the locking main driving rod is fixedly connected with the output end of the locking motor, the other end of the locking main driving rod is movably connected with the transition sleeve in a pluggable mode, and the end, away from the locking main driving rod, of the transition sleeve is fixedly connected with one end of the replacement transition rod. The end, away from the transition sleeve, of the replacement transition rod is movably connected with the dismounting sleeve in a pluggable mode. The anti-shearing force of the locking main driving rod can be effectively improved, the service life of the locking main driving rod is prolonged, the situation that accessories are replaced due to abrasion caused by frequent tangential force is improved, the accessory replacement cost is reduced, the accessory replacement convenience is improved, synchronous locking is achieved according to opposite angles fastened by bolts and nuts at different positions, and the locking effect is good. And the stress uniformity of part assembly in the automobile machining process is improved.

The utility model discloses a gear rack driven screen frame lifting structure, which comprises a bearing beam, a screen frame, a second gear, a lifting rack and third gears, the output end of a servo motor is fixedly connected with a first gear, the first gear is meshed with the second gear, the second gear is fixed on a second connecting rod, and the third gears are fixed at two ends of the second connecting rod. The servo motor drives the gears to rotate, the rotating gears are meshed with the racks to drive the screen frame to ascend and descend, the screen frame is driven by power when descending and ascending, and the screen frame is driven by the power when descending and ascending. A traditional pneumatic driving structure is replaced, the structure is simpler, and the maintenance cost is reduced while the working efficiency is improved; when the screen frame ascends and descends, the lifting plate can be limited by the limiting sliding blocks, deviation of the screen frame in the ascending and descending process is avoided, and the ascending and descending displacement precision of the screen frame is improved.

The utility model discloses a seaborne adjusting platform and a spacecraft launching ship, and relates to the technical field of seaborne launching platforms, the seaborne adjusting platform comprises a movable adjusting assembly, the movable adjusting assembly comprises an assembling platform, hydraulic cylinders, a limiting pressing plate, a split type rocket, a threaded block, a lead screw, a motor and a transmission belt, the hydraulic cylinders are fixed to the two sides of the assembling platform, and the limiting pressing plate is fixed to the limiting pressing plate. The output end of the hydraulic cylinder is connected with a limiting pressing plate. According to the offshore adjusting platform and the spacecraft launching ship, the spacecraft launching platform is composed of an upper platform body, a middle stand column and a lower floating body from top to bottom, and the lower floating body provides buoyancy for the whole platform so that the platform can float on the sea surface in a semi-submersible mode; compared with a fixed launching platform on land, the spacecraft launching platform disclosed by the utility model can be dragged to move by tugs through the traction blocks in a suspension state, is more flexible to use, and can meet the launching requirements of spacecrafts at different positions.

The present invention discloses an automatic displacement compensation thrust bearing, comprising a thrust shaft and a thrust plate, one side of the thrust plate is slidably supported on the inner side of the left end plate, the other side of the thrust plate is slidably supported with a thrust block, a displacement compensation piston is slidably arranged in the bearing housing, and a compensation damping spring is supported between the thrust block and the inner end of the displacement compensation piston; a thrust block displacement sensor is arranged on the thrust block, and a piston displacement sensor is arranged on the displacement compensation piston; the oil outlet of the hydraulic pump is connected to the pressure oil port P of the hydraulic reversing valve, the A port of the hydraulic reversing valve leads to the hydraulic oil chamber between the displacement compensation piston and the right end plate, and the oil return port T of the hydraulic reversing valve is connected to the oil tank; the piston displacement sensor and the thrust block displacement sensor are electrically connected to the automatic controller, and the automatic controller is electrically connected to the hydraulic reversing valve. The automatic displacement compensation thrust bearing can not only automatically compensate for the axial displacement of the thrust shaft, but also effectively reduce the structural vibration of the bearing.

The utility model relates to the technical field of mobile phone shell machining, in particular to a positioning device which comprises a machine base, a first positioning block, a second positioning block, a separation block, a first positioning mechanism and a second positioning mechanism. The first positioning block, the second positioning block, the first positioning mechanism and the second positioning mechanism define a discharging area, and the partition block is arranged in the discharging area and divides the discharging area into two containing positions. The positioning device disclosed by the utility model is beneficial to positioning the mobile phone shells placed in the placing positions so as to realize automatic positioning of injection molding parts, so that the positioning time and the positioning precision of the injection molding parts are effectively controlled, and the purposes of improving the processing efficiency and the yield of the mobile phone shells are achieved.

A micro-stage and a lithography machine are disclosed, relating to the field of semiconductor manufacturing equipment technology. The micro-stage is used on the coarse stage of a lithography machine. The micro-stage includes a moving part, a fixed part, and a driving part. The fixed part is connected to the coarse stage, and the moving part is movably disposed on top of the fixed part. The top surface of the moving part has a substrate for supporting a wafer. The driving part has a first driving member and a second driving member for relative motion. The first driving member is disposed on the side of the moving part facing the fixed part, and the second driving member is disposed on the side of the fixed part facing the moving part, so as to drive the moving part to move relative to the fixed part through the first driving member. A measurement mating part is integrally formed on the surface of the moving part, which is used to cooperate with an external measuring device to obtain the relative distance between the moving part and the fixed part. This micro-stage has a compact structure and high integration, improving space utilization and facilitating lightweighting and miniaturization.

The utility model relates to the technical field of tools for decoration engineering, in particular to a punching tool for indoor decoration. The punching tool for indoor decoration solves the technical problems that in the prior art, a punching tool is low in punching precision and cannot collect dust. A punching tool for indoor decoration comprises a handheld drilling machine and a guide cover arranged on the drilling machine, the guide cover is provided with a dust receiving box, and the dust receiving box is connected to the guide cover in an inserted mode; the positioning ring and the guide rod are arranged, the guide rod is connected to the drilling machine in a sliding mode, the spring is further arranged between the guide rod and the drilling machine, the positioning ring makes contact with the wall face in the punching operation, the drilling machine is kept in the state of being perpendicular to the wall face, the elastic acting force of the spring is overcome, the drilling machine moves towards the wall face, and the guide rod enables the drilling machine to have higher displacement precision; therefore, the drilling machine can be prevented from inclining, and punching precision is improved.

The utility model relates to a steel plate groove cutting platform which comprises a base, two supporting units, a linear moving mechanism and an assembling platform, the two supporting units are both arranged on the base, the two supporting units are symmetrically arranged about a defined axis, and each supporting unit is composed of a plurality of supports arranged at intervals in the length direction of the base; the linear moving mechanism is arranged on one supporting unit; the assembling platform is connected with the linear moving mechanism and used for assembling the flame cutting machine. Through the supporting effect of the two supporting units, it is guaranteed that the steel plate is vertically placed, grooves can be normally cut, and the edge of the steel plate is prevented from deforming. And the linear moving mechanism can improve the displacement precision of the assembly platform, so that the straightness of the steel plate can be ensured.

The present invention relates to a fuzzy PID-based RGV speed closed-loop control method, comprising: generating a driving S-type speed curve, whose horizontal and vertical coordinates are reference time and speed respectively; judging that the RGV actually starts to move according to the detected RGV displacement information, and continuing to the next step; generating a reference S-type speed curve, whose starting point of the horizontal coordinate is the actual start time of the RGV; calculating the error value between the instantaneous speed value on the reference S-type speed curve and the current actual movement speed of the collected RGV; inputting the error value into the function module of the fuzzy PID controller to obtain the output value; adding the output value of the fuzzy PID controller to the corresponding instantaneous speed value of the driving S-type speed curve to obtain the final speed value, and transmitting the final speed value signal to the frequency converter of the driving wheel motor of the RGV after limiting the amplitude. The present invention solves the problem of poor speed closed-loop control effect caused by system output hysteresis.

The utility model relates to the technical field of medical suspension bridge movement, and discloses a medical suspension bridge with a rotating mechanism, which comprises an electric moving device, a rotating connecting block medical suspension bridge movement, a storage plate frame medical suspension bridge movement and a medical storage frame medical suspension bridge movement. Two rotating connecting blocks are installed at the bottom of the electric rotating mechanism at equal intervals, and a storage plate frame medical suspension bridge movable part and a medical storage frame medical suspension bridge movable part are installed at the bottoms of the rotating connecting block medical suspension bridge movable part correspondingly; and three placing plates are equidistantly mounted in the middle of the medical suspension bridge movable part of the placing plate frame. According to the medical suspension bridge with the rotating mechanism, convenient operation can be achieved through the electric movable device, the rotating mechanism which is electrically controlled to transversely move is adopted, medical staff can operate through equipment such as a remote control or a control panel, operation is more convenient and simpler, and manpower and time consumption is reduced.