163 results about "Machine maintenance" patented technology

Provided is a work machine maintenance management system capable of predicting replacement timing of a component of a work machine early. The work machine maintenance management system of this disclosure includes a maintenance management DB server 110 that accumulates maintenance management information of a plurality of work machines and a maintenance management control device 120 that predicts replacement timing of each component of each of the work machines based on the maintenance management information. The maintenance management information includes an actual durable period from start of use to replacement each component of each work machine. The maintenance management control device 120 includes a replacement-factor determining section 121, a service life model creator 122, a failure model creator 123, and a replacement time predictor 126. The replacement-factor determining section 121 determines whether a replacement factor of each component is a service life factor or a failure factor based on an actual durable period of each component of the plurality of work machines. The service life model creator 122 creates a service life model of the component whose replacement factor is determined to be the service life factor by the replacement-factor determining section 121. The failure model creator 123 creates a failure model of the component whose replacement factor is determined to be the failure factor by the replacement-factor determining section 121. The replacement time predictor 126 predicts the replacement timing of each component of each work machine based on the service life model and the failure model.

The invention belongs to the technical field of workshop scheduling and maintenance combination, and particularly relates to a flexible job workshop production scheduling and machine maintenance combination optimization method and system. The method comprises the following steps: S1, acquiring basic information of flexible job shop production scheduling and machine maintenance joint optimization; s2, taking minimization of the total cost of a production system as a target function, and constructing a flexible job shop production scheduling and machine maintenance joint optimization model; s3, converting the flexible job shop production scheduling and machine maintenance joint optimization model into a Markov decision process, and respectively defining states, actions, state transition and rewards of production scheduling and machine maintenance; s4, designing a joint optimization method based on a digital twinning and double-layer reinforcement learning algorithm based on the Markov decision process, and obtaining a trained agent through training; and S5, applying the trained intelligent agent to an actual flexible job shop production scheduling and machine maintenance joint optimization problem.

The invention provides a remote fault maintenance method for a coffee machine, and relates to the technical field of coffee machine maintenance. The remote fault maintenance method for the coffee machine comprises the following steps: S1, module division and fault signal determination; s2, collecting test data, and carrying out fault analysis training by utilizing machine self-learning; s3, enabling a remote diagnosis function by the user; s4, fault signal detection is carried out on the fault model; s5, the user carries out self-recovery according to the diagnosis report; and S6, processing when the repair scheme is invalid. According to the invention, when the coffee machine of the user has a fault, the user can actively apply for a remote diagnosis service, the coffee machine can automatically upload historical whole machine operation data and a fault signal to the server, and the server rapidly analyzes the data through machine learning, generates a fault diagnosis report and provides a detailed fault reason and a repair scheme.

The invention provides an atmosphere data system. The atmosphere data system comprises four distributed atmosphere data computers, four static pressure sensors, two total temperature sensors, four attack angle sensors, a sideslip angle sensor, two sets of heating control boxes and a backup instrument, the reliability is greatly improved; the functions are integrated, pressure signals are transmitted through a bus, laying of pipelines on the machine is omitted, complex pipelines on the original machine and corresponding airtightness inspection work of the pipelines can be omitted, and maintenance work on the machine is reduced.

The invention relates to the technical field of pump maintenance, in particular to a high-sealing centrifugal pump convenient to maintain, which comprises a base, a servo motor, a pump shell and the like, a servo motor is detachably connected to the base; a pump shell is detachably connected to the base. The pump shell is provided with a water inlet; the pump shell is provided with a water outlet; a water pumping space is arranged in the pump shell. According to the device, a worker pulls up the rubber plug, the rotating ring is rotated by 90 degrees anticlockwise with hands on the basis of looking from front to back, so that the connector and the rubber plug are driven to rotate by 90 degrees anticlockwise, the maintenance opening is exposed, and the worker can penetrate through the maintenance opening to maintain the sealing shell and the water collector; the pump shell does not need to be disassembled for maintenance, so that the maintenance efficiency of the centrifugal pump is improved; the air pump is controlled to blow air, so that air flow enters the cavity along the ventilation pipe, whether the cavity leaks air or not is detected, and the sealing performance is rapidly detected.

The invention relates to a production scheduling and machine maintenance real-time decision-making method based on deep reinforcement learning, and the method comprises the steps: obtaining the operation characteristics of a production workshop and the actual maintenance condition information of a machine, and constructing an integrated optimization model of dynamic scheduling and predictive maintenance based on the operation characteristics and the actual maintenance condition information; acquiring real-time state data of machine operation, predicting the residual service life of the machine by using a deep learning method based on the real-time state data, setting a first threshold value and a second threshold value of the residual service life, and dividing machine maintenance states based on the first threshold value and the second threshold value; constructing a DDQN-based intelligent agent, solving the integrated optimization model based on the intelligent agent, and generating a production scheduling and machine maintenance real-time decision; the intelligent agents comprise a scheduling intelligent agent and a maintenance intelligent agent, and the states of the intelligent agents comprise operation characteristics and remaining service life. Compared with the prior art, the method not only meets the production performance requirement of reducing the total delay, but also optimizes the maintenance cost.

The invention provides a high-voltage power-down display control method, a vehicle control unit, engineering machinery and a medium, and relates to the technical field of electric engineering machinery. The method comprises the steps that a power-off signal of the engineering machine is acquired, the power-off type of the engineering machine is determined according to the power-off signal, and the power-off type comprises normal power-off and abnormal power-off; when the power-off type of the engineering machinery is normal power-off, normal power-off logic is executed, and a display screen of the engineering machinery is controlled to be turned off after high-voltage power-off of the whole vehicle is detected; and when the power-off type of the engineering machinery is abnormal power-off, sending adhesion fault prompt information to a display screen of the engineering machinery, and controlling the display screen of the engineering machinery to be closed after detecting that the whole vehicle is in high voltage. According to the method, visualization of the high-voltage state of the whole vehicle can be achieved through the display screen, and therefore the safety of engineering machinery maintenance is improved.

The invention relates to the field of winding equipment, in particular to a high-speed winding system which comprises a suspension steel collar composed of an outer ring and an inner ring, and the inner ring is rotationally installed in the outer ring; an annular gap between the inner ring and the outer ring is an air passage; the multiple air inlet pipes are distributed in the circumferential direction of the outer ring at equal intervals, and the output ends of the air inlet pipes communicate into the air channel; filtered compressed air is injected into the air channel through the air inlet pipe, so that a radial air film and an axial air film are formed in the air channel, and the inner ring is in a full-suspension state and does not make contact with the outer ring. A steel wire hook is installed at the top end of the inner ring and used for restraining the motion trail of yarn penetrating through the inner ring. By establishing a structure without mechanical friction in the yarn winding process, contact type friction motion in the original yarn winding process is changed into existing friction-free motion, so that the yarn winding and spinning speed is increased, the rotating speed can reach 50000 rpm, and the yield and the yarn quality are greatly improved; meanwhile, according to the design, original friction consumable replacement and frequent machine maintenance work are reduced.

The utility model discloses a special maintenance tool for an electric switch machine, which comprises a detection steel sheet with a rectangular structure, the width of the detection steel sheet is 20mm, and the thickness of the detection steel sheet is 4mm; the equipment key is used for opening a machine cover of the electric switch machine; the sleeve and the solid wrench are used for adjusting the adjusting screw at the tail part of the indication rod; the equipment key is fixed on the upper surface of the detection steel sheet, the sleeve is fixed on the lower surface of the detection steel sheet, and the sleeve and the equipment key are located at the same end of the detection steel sheet; the solid wrench is a groove arranged on the side wall of the detection steel sheet. According to the electric switch machine maintenance tool, the functions of four common maintenance tools in the maintenance operation of the electric switch machine are ingeniously integrated, the tool is convenient to carry, and the working efficiency can be remarkably improved in actual operation. The integral design of the tool is of a T-shaped structure, so that the transverse pen part and the vertical pen part of the tool can be used as a force arm handle during operation, and the convenience of operation is greatly enhanced.

A cleaning apparatus for a surface submerged in a liquid includes: an apparatus body; and an automatic rising-sinking structure, where through an operation of the automatic rising-sinking structure, the apparatus body rises or sinks. The cleaning apparatus for the surface submerged in the liquid automatically rises and sinks through the automatic rising-sinking structure, without being manually searched and lifted out of a water surface. The cleaning apparatus for the surface submerged in the liquid can also automatically rises out of the water surface when a filter box is to be cleaned or machine maintenance is required. The cleaning apparatus for the surface submerged in the liquid reduces a manual labor, shortens searching time, and improves a working efficiency.

An ink machine maintenance auxiliary device comprises a frame, the top of the frame is provided with a storage base used for containing an ink machine, an oil receiving disc used for collecting waste liquid is arranged in the frame, and an oil passing groove corresponding to the oil receiving disc is formed in the middle of the storage base; the storage base comprises a bottom plate and a support used for supporting the printing ink machine in an overhead mode, and the support is arranged on the oil passing groove in a crossing mode. Compared with the prior art, the printing ink machine is placed on the support, overhead arrangement of the bottom of the printing ink machine is achieved, waste liquid at the waste liquid discharging opening in the bottom of the printing ink machine can be conveniently discharged, an operator does not need to carry the printing ink machine, and time and labor are saved; and meanwhile, liquid such as waste liquid generated in the maintenance process of the printing ink machine can be collected through the oil receiving disc arranged on the frame, and therefore the waste liquid cannot pollute the maintenance device and the ground.

The utility model relates to an auxiliary tool for maintenance of a sealing skin of a sintering pallet, which is applied to the technical field of maintenance of sintering machines, solves the problems that the existing cutting surface is uneven, air leakage is easy to exist at the bonding position, and meanwhile, the problem that the sintering pallet is scratched and secondarily damaged, and comprises a workbench, at least two clamping plates and a fixing piece, the clamping plate located at the lowest end is installed on the workbench, one side face, in the length direction, of each clamping plate is arranged in an inclined face mode, and the inclined faces of every two adjacent clamping plates are located on the same plane. The fixing pieces are distributed in the circumferential direction of the clamping plates, each fixing piece comprises a lead screw and a fastening nut connected to the lead screw in a threaded mode, the bottom end of each lead screw is vertically fixed to the upper end face of the clamping plate located on the lowest layer, and the top end of each lead screw upwards slides and extends to the position above the clamping plate located on the highest layer; the inclined plane cutting device has the advantages that the inclined plane can be directly cut out, the inclined plane is smooth, follow-up glued sealing leather is facilitated, operation is convenient and fast, and the maintenance efficiency is improved.

The utility model discloses agricultural machinery maintenance equipment, and belongs to the technical field of agricultural machinery. The device mainly comprises a body. The storage bin is fixed in the main body and used for adding lubricating oil, one side of the interior of the storage bin is slidably connected with a piston plate, and one side of the storage bin communicates with two corrugated pipes; the clamping mechanism is positioned on one side of the main body and is used for clamping the saw blade; the rotary smearing mechanism is located on one side of the clamping mechanism and used for maintaining the saw blade; according to the agricultural machinery maintenance equipment, a first handrail is gradually pushed, at the moment, the first handrail drives a connecting plate to move towards one side through a sliding block, the connecting plate drives a piston plate to move towards one side through a connecting column, and then lubricating oil in a storage bin enters a connecting shaft through a connecting pipe; lubricating oil in the connecting shaft enters the rotating plate and then is in contact with the sponge pad through the through hole to soak the sponge, so that the cotton cloth stained with the lubricating oil is prevented from being manually held, and the phenomenon that the lubricating oil drips is avoided.

Provided are a visual intelligent diagnosis method and system for an electronically controlled engine, and a device and a storage medium, which belong to the technical field of engine diagnosis, and solve the technical problem of existing diagnosis methods not being suitable for ordinary operators. The method comprises: making a display model of an engine; setting display labels at parts to be diagnosed of the display model; displaying on an HMI the display model having the set display labels; sending in real time a detection result of the engine to the HMI, and highlighting the display label corresponding to the currently detected part to be diagnosed; displaying the display labels in different states on the basis of the detection result; and querying a diagnosis database on the basis of the detection result, so as to obtain fault information and troubleshooting measures, and displaying the fault information and the troubleshooting measures on the HMI. The intelligent diagnosis method for an engine can automatically and accurately lock a faulty part, and an ordinary operator can perform fault handling on the basis of a system troubleshooting guide, such that the machine maintenance costs are low, and the hardware, software and technicians necessary for fault analysis are saved on.

The utility model discloses an equipment maintenance device, and relates to the technical field of maintenance, and the equipment maintenance device comprises a bearing assembly, a moving device, an adjusting mechanism and a handrail; the bearing assembly comprises a chassis and a platform movably arranged on the chassis, and the platform is used for bearing equipment; the moving device is arranged on the chassis and used for driving the bearing assembly to move; the adjusting mechanism is arranged on the chassis and used for driving the platform to ascend and descend. The handrail is detachably installed on the bearing assembly. According to the equipment maintenance device, lifting of the platform can be achieved through the adjusting mechanism, manufacturing and mounting errors of the copying and printing integrated cabinet are made up, it is ensured that the platform and a tray in the copying and printing integrated cabinet are in butt joint without height difference, and therefore it is ensured that the copying and printing integrated machine is pulled out and pushed in smoothly, and maintenance convenience of the copying and printing integrated machine is improved.

The present invention discloses a maintenance base station and a cleaning machine maintenance system, wherein the maintenance base station comprises: a base station body, including a liquid storage tank, a water injection joint and a nozzle, the liquid storage tank is used to store cleaning liquid, the water injection joint is used to supply cleaning liquid to the water tank of the cleaning robot, and the nozzle is used to supply cleaning liquid to the mopping and wiping parts of the cleaning robot; a water circuit switching device, the water circuit switching device connects the liquid storage tank, the water injection joint and the nozzle, and the water circuit switching device can selectively switch to a state where the liquid storage tank is connected to the water injection joint, or switch to a state where the liquid storage tank is connected to the nozzle. In this solution, by setting up the water circuit switching device, the maintenance base station can supply cleaning liquid to the mopping and wiping parts of the cleaning robot, and can also replenish cleaning liquid to the water tank of the cleaning robot, thereby enriching the functions of the maintenance base station.

The invention relates to the technical field of screw hoist maintenance, in particular to an in-situ precise measurement and control correction device for a screw of a screw hoist, the in-situ precise measurement and control correction device comprises a mounting bracket and two groups of correction frames, an electric cylinder is mounted on the inner side of the mounting bracket, the telescopic end of the electric cylinder is fixedly connected with a suspension, and the right side of the suspension is fixedly connected with a surrounding frame. The in-situ precise measurement and control correction device for the screw of the screw hoist is provided with an undeformed part which can be in contact with the screw after the correction rollers get close to each other, and at the moment, the circle center of an approximately-annular support composed of the two correction frames is concentric with the axis of the screw; when pushing force is applied to the two attaching frames at the diagonal positions, the attaching frames and the correcting rollers connected with the attaching frames can rotate circumferentially along the axes and make contact with the protruding parts of the screws at the moment, when the attaching frames are repeatedly pushed and pressed, the correcting rollers can roll and press the protruding parts of the attaching frames till the protruding parts are concentric with the axes, and the rolling and correcting effects are achieved.

The invention belongs to the technical field of jacquard machine maintenance, and particularly provides a heddle polishing device of a jacquard machine, which comprises a polishing box, a rubbing polishing device is arranged in the polishing box, the rubbing polishing device comprises a bottom rubbing table, a top sliding strip, a top rubbing table and a hydraulic interaction assembly, and the bottom rubbing table and the top sliding strip are slidably clamped on the inner bottom wall and the inner top wall of the polishing box respectively. The top rubbing table is arranged on the lower wall of the top sliding strip, the bottom rubbing table and the top sliding strip are in transmission connection with the hydraulic interaction assembly, and the hydraulic interaction assembly and the top rubbing table are arranged in a hydraulic transmission mode. According to the heddle polishing device, the upper wall and the lower wall of the heddle are extruded, rubbed and polished in a clamping and rubbing mode, the heddle is pressed and polished through the special hydraulic pipeline design, the outer side wall of the heddle can be automatically polished through the pressing centering part, a heddle eye can be driven to the polishing groove, polishing of the heddle eye is facilitated, and the polishing efficiency is improved. And multidirectional polishing of the harness wires is realized in a simple extruding and rubbing manner.

The invention discloses a thermal power boiler auxiliary machine maintenance supporting platform which comprises a supporting base, a lifting platform, a lifting structure, a fixed supporting structure and an auxiliary adsorption structure, the lifting platform is installed on the supporting base through the lifting structure, the fixed structure is installed on the supporting base, and the auxiliary adsorption structure is installed on the supporting base. The lifting platform has the beneficial effects that in the lifting function, the lifting shear fork type support is matched with the sleeving shaft pipe, it is guaranteed that the lifting platform ascends and descends stably, and it is guaranteed that the process is stable and safe. According to the auxiliary adsorption structure, a horizontal telescopic shaft pipe flexibly stretches out and draws back through cooperation of an electromagnet and a magnet, the platform is tightly fixed to the outer side of boiler equipment in combination with negative pressure, a negative pressure adjusting plate and a threaded rod are linked to adjust adsorption force according to needs, and adaptability and flexibility are enhanced.

The utility model belongs to signal equipment tool technical field, specifically provides a signal machine column sealing device, including the cap, plunger body, telescopic buckle and drive mechanism, the plunger body is connected in cap below, telescopic buckle is installed in the plunger body inside, the plunger body lateral wall is equipped with the buckle hole matched with telescopic buckle, drive mechanism is used for driving telescopic buckle and is stretched out the buckle hole or shrink to the plunger body inside. The signal machine column sealing device provided by the utility model seals the high column signal machine concrete machine column top by plunger body and cap, no longer adopts the concrete, simplifies the plugging construction, effectively prevents the influence signal equipment normal work because of plugging leakage. The plunger body lateral wall is equipped with controllable telescopic buckle, can be with the machine column inner wall and is pasted, prevents the device from falling through stress mode, and the signal machine maintenance is convenient when dismantling.

1. Name of the product under this design: Bottle (Washing Machine Care Liquid‑JDTG). 2. Purpose of this design product: used to install washing machine maintenance liquid. 3. The key design point of this design product lies in the combination of shape and pattern. 4. The picture or photo that best illustrates the design points: Stereoscopic drawing 1.

The invention discloses an intelligent management system for supplying and recycling cutters and tools, which comprises an intelligent host, at least one cutter cabinet and at least one tool cabinet which are electrically connected with each other, and the intelligent host is provided with a scanning and distinguishing device, a touch display input device and a wired / wireless internet connection line, the intelligent host is provided with a material picking program module, a return program module, an old-to-new module, a replenishment program module, a push early warning notification module and a data analysis and report generation module, after an employee distinguishes and confirms, material picking and return or replacement of an old knife / tool with a new knife / tool can be carried out, a manufacturer can scan a bar code of the knife / tool according to replenishment, replenishment can be carried out immediately, and the replenishment efficiency is improved. In addition, the manufacturer can also receive the push early warning notice to carry out machine maintenance or cutter / tool replenishment, and the manager receives data analysis and report generation so as to understand the use condition of the related cutter / tool, so that the omnibearing cutter / tool management and control effect is achieved.

The invention provides a method and a device for predicting the heat dissipation performance of hydraulic engineering machinery, and the method comprises the steps: building a function relation between the working duration and each heat dissipation performance influence factor during heat balance through the historical working condition data (including working conditions, environment temperature and other factors) of the heat balance of the engineering machinery, and calculating the heat dissipation performance of the engineering machinery according to the threshold value and correlation coefficient of each heat dissipation performance influence factor. And predicting the overall working time of the radiator and respectively reminding the working time of each radiating performance influence factor. And considering the influence of each factor on the heat dissipation performance, predicting the dynamic change of the working duration along with the working state of the engineering machinery every day, and outputting a dynamic prediction result. According to the method, the working duration can be predicted, timely machine maintenance or timely fault point finding can be reminded, shutdown or serious machine damage caused by serious faults can be avoided, and the equipment safety can be improved.

The utility model relates to the technical field of welding machines, in particular to a novel welding machine which comprises a welding machine body, a shell and a heat dissipation net, the welding machine body comprises a bearing plate, a side plate is arranged at one end of the upper side of the bearing plate, and a wiring operation plate is arranged at the other end of the upper side of the welding machine body. A mounting frame is arranged at the inner side positions of the side plate and the wiring operation plate, a circuit component is arranged at the inner side of the mounting frame, a pipeline heat dissipation component is mounted at the inner side of the side plate, a bayonet is formed in the lower end position of the outer side of the shell, and sliding grooves are formed in the lower end positions of the side plate and the wiring operation plate; a fixing plate is arranged in the sliding groove. The pipeline heat dissipation component blows air to the lower side of the circuit component to dissipate heat, the heat dissipation uniformity is improved, the heat dissipation effect of the circuit component is facilitated, the welding machine body and the shell are rapidly detached through the bayonet and the spring bolt, and the welding machine is convenient to maintain.

The present application relates to physical vapor deposition process, especially to the PVD-AlN machine maintenance after the method of re-computer. The re-computer method, including the following steps S1: setting the cavity temperature is 780~820 DEG C and 630~670 DEG C in turn for baking;S2: keep the cavity temperature is 630~670 DEG C, two times into argon and nitrogen, the second time into argon and nitrogen when setting Source DC is 2800~3200;S3: continue to pass into argon and nitrogen, the temperature drops to 450~550 DEG C. The re-computer method, let the cavity of PVD-AlN machine in 780~820 DEG C and 630~670 DEG C in turn for baking, two times of baking removes the moisture and impurities of the cavity respectively;Again continue to pass into argon and nitrogen to remove the organic compounds in the cavity and cooling to 450~550 DEG C.

The invention provides a signal generator for CT machine maintenance, and relates to the technical field of test instruments. The signal generator for CT machine maintenance comprises a machine body and a control panel, ventilation assemblies are arranged on the two sides of the machine body, a data interface is in threaded connection in a mounting hole in the front end of the control panel through a connecting sleeve, and the rotating directions of internal and external threads of the connecting sleeve are opposite. The plug of the data interface is in plug-in fit with the socket in the mounting hole, the ventilation assembly drives the rack through the pull rod to drive the air deflector to rotate, meanwhile, the brush is linked to clean dust on the air deflector, and heat dissipation and dust removal are achieved through bolt positioning. According to the device, rapid disassembly and assembly of the data interface are achieved through thread reverse design, the problem that in the prior art, interface disassembly and replacement are complex is solved, the ventilation and dust removal integrated structure can reduce accumulated dust while ensuring the heat dissipation efficiency, and the device is suitable for signal injection and equipment maintenance during CT machine overhaul and has the advantages of being convenient and fast to operate and high in stability.

The utility model relates to a sintering machine, apply in sintering machine maintenance technical field, solved in the process of replacement to the sintering trolley of trouble, hoist trolley operation is unstable, trouble sintering trolley is easy to incline, fall, and there is the problem of hidden danger of safety, including trolley track, sintering trolley and unloading auxiliary frock, unloading auxiliary frock includes erecting on the support frame of trolley track, the flap that rotates and connects on the support frame one end and hydraulic push cylinder, the telescopic end of hydraulic push cylinder is hinged in the other end lower end surface of flap, the main part of hydraulic push cylinder is hinged in the support frame, the upper end surface of flap is provided with the fixing piece for fixing damaged sintering trolley, have trouble sintering trolley fixed firm, operation is stable, can solve the safety problem of sintering machine trolley on -line replacement, reduce the safety hidden danger of field work environment, improve the effect that replacement efficiency.

The utility model provides an anti-adhesion sizing sleeve, and belongs to the technical field of pipe extrusion equipment. The problem of how to reduce the rejection rate of products while reducing the maintenance cost of a machine is solved. The anti-adhesion sizing sleeve comprises a tubular body, a surface treatment layer formed through sand blasting treatment is arranged on the inner wall of the body in the circumferential direction, the surface treatment layer is made of carborundum materials, and a lubricating layer formed through spraying treatment is arranged on the inner wall of the surface treatment layer in the circumferential direction. And the lubricating layer is made of a polyphenylene sulfide material. According to the anti-adhesion sizing sleeve, the rejection rate of products can be reduced while the maintenance cost of a machine is reduced.

The utility model discloses a vending device for vacuum-packaged prefabricated dishes, which belongs to the technical field of vending machines and comprises a shell frame, and a food making component, a food delivery component, a machine maintenance window, a food outlet, a payment window and a food ordering screen are mounted in the shell frame. The food making assembly comprises a bag opener, a squeezer, a heater and a fetching clamp which are sequentially arranged from bottom to top, the food delivering assembly comprises a dinner plate storage box and a food delivering device, a plurality of dinner plates are stored in the dinner plate storage box, the food delivering device is provided with a fixed part and a sliding part, and the fixed part and the sliding part are connected with each other. The fixing part is installed on the side wall of the shell frame and located below the bag opener. According to the selling device for the vacuum-packaged prefabricated dishes, a plurality of functional assemblies such as food conveying, meal making and meal delivering are integrated, all the assemblies are matched with one another, automation of the whole process from storage, conveying, making to meal delivery of the prefabricated dishes is achieved, manual intervention is greatly reduced, and the manual maintenance frequency and cost are reduced.

The novel thermal printer comprises a flip cover, a middle frame and a torsion spring, the outer side of the flip cover is provided with a first positioning groove and a first positioning shaft, and the first positioning groove is located at the upper part of the first positioning shaft; a first positioning hole and a second positioning groove are formed in the middle frame, and the first positioning hole is used for fixing the first positioning shaft; the torsion spring is provided with a first torsion arm and a second torsion arm, the first torsion arm can abut against the first positioning groove, and the second torsion arm can abut against the second positioning groove. The turning cover and the middle frame are provided with the positioning grooves respectively, the two ends of the torsional spring are clamped with the positioning grooves so that the positioning shaft on the turning cover can be smoothly guided into the shaft hole of the middle frame, the turning cover can be disassembled only by pushing the turning cover out in the opposite direction, and therefore the machine can be maintained more easily, daily cleaning and inspection of a user are facilitated, and the working efficiency is improved. And the problem that noise may be generated by a traditional torsional spring connection mode is avoided, so that the printer is more quiet when the flip cover is opened or closed, and the user experience is improved.