29 results about "Random switching" patented technology

The invention discloses an event-triggered adaptive fixed time control method for a random nonlinear switching system. The method comprises the following steps: constructing a model of the random nonlinear switching system; introducing an event triggering mechanism; designing a fixed time control strategy; and designing an event-triggered fixed-time adaptive controller based on a backstepping method design framework. According to the event-triggered adaptive fixed time control method for the random nonlinear switching system, an event-triggered control strategy is adopted to reduce the communication burden of the system. A new controller is stably constructed by using fixed time, and the upper bound of convergence time is irrelevant to initial conditions; meanwhile, by introducing nonlinear mapping, a random nonlinear system with symmetric and asymmetric output constraints is converted into a new unconstrained system, and random switching of the control system is realized by using a switching signal.

The utility model relates to the technical field of monocular night vision device supports, and particularly discloses a monocular night vision device left and right eye switching support which is easy to operate and comprises a positioning plate, L-shaped plates are connected to the two sides of the top of the positioning plate, an arc-shaped mounting plate is fixedly connected to one side of each L-shaped plate, and an adjusting groove is formed in the positioning plate. A sliding block is slidably connected to the interior of the sliding groove, a square block is fixedly connected to the top of the connecting block, a monocular night vision device body penetrates through the interior of the round hole, an adjusting knob is in threaded connection with the interior of the threaded hole, and an extrusion block is fixedly connected to the bottom end of the adjusting knob. According to the monocular night vision device, the square block, the adjusting knob, the extrusion block, the sliding groove, the connecting block, the compression spring, the adjusting plate and the fastening knob are matched for use, so that the monocular night vision device body can be freely switched between the left eye and the right eye during use, the operation mode is simple during switching, and workers can conveniently use the monocular night vision device; and the height of the arc-shaped mounting plate can be adjusted as required.

The multifunctional multi-station flexible cleaning machine comprises an installation support, installation plates are fixedly installed on the two sides of the installation support at the corresponding heights, a plurality of independent lifting adjusting devices are correspondingly installed on the installation plates, and the independent lifting adjusting devices are correspondingly provided with different cleaning assemblies. Through the structural arrangement, the cleaning machine has the characteristics of multiple functions and multiple stations, and different cleaning procedures are set, so that different products can be randomly switched, or the stations can be exchanged according to different product objects, even more cleaning stations can be added, and different workers can be conveniently selected to clean the surfaces of the products.

The present application relates to a kind of multi-vehicle random switching flexible total assembly system for medium and large-sized passenger cars, including assembly platform and upper piece area, the upper piece area of assembly platform two sides respectively stores the side wall of two sides of the same vehicle;Upper piece area includes upper piece track and storage track, storage track is located in the two sides of upper piece track, upper piece track is equipped with assembly sliding table and welding robot sliding table, storage track is equipped with clamp, mobile tooling table and traction dolly, traction dolly connects mobile tooling table, clamp is fixed on mobile tooling table and connects two-way pneumatic-electric switching component, clamp clamps side wall and keeps clamping state when clamping side wall.Compared with prior art, the present application has the advantages that the clamp is fixed on the mobile tooling table and connected with the two-way pneumatic-electric switching component, the clamp is provided with air supply and power, the power and control signal of the clamp are not interrupted during transportation, the clamp keeps clamping state, the position of the side wall does not change, and the accuracy of the side wall assembly position is ensured.

The application provides a multi-target switching device, which comprises a target frame, a target plate, a driving mechanism and a base, the target frame comprises two power edges and two fixed edges; the target plate comprises an upper target plate and a lower target plate; one end of the first fixed edge is hinged to the base, and the other end is hinged to one end of the first power edge; the first fixed edge is arranged in a vertical state, can be tilted backward and fixed back; the second power edge is located in front of the first fixed edge, one end of the second power edge is connected to the driving mechanism and can rotate around the driving mechanism; the two ends of the second fixed edge are respectively hinged to the other ends of the two power edges; the upper target plate is fixedly connected to the second fixed edge, and the lower target plate is fixedly connected to the second power edge; when the two power edges are in a vertical state, the upper target plate and the lower target plate are located in the same plane; a shifting block is arranged on the second power edge. The application can independently realize random switching of the tactical posture of a combat unit and more realistically simulate the tactical action of the combat unit in actual combat.

The invention discloses a hysteresis current control method and system for a two-level grid-connected converter, and belongs to the technical field of converter control. The method comprises the following steps: fixing the switching frequency of the converter through a frequency inner ring; generating a reference square wave and collecting a switch square wave; multiplying and accumulating the two in each control step length, and taking an accumulated value as a phase discrimination result at the rising edge of a switching period to finish switching phase discrimination; comparing a phase discrimination result with a phase reference value, and processing the phase discrimination result by a PI (Proportional Integral) controller; pI output is processed and then fed back to a frequency instruction, a phase outer ring is formed through a frequency-phase integral relation, and closed-loop control of a switch phase is achieved. The technical problems that a traditional hysteresis control switch is random in phase and multi-machine parallel ripple offset cannot be achieved are solved, the advantage of dynamic performance of hysteresis control is kept, meanwhile, accurate fixing of the switching frequency and the phase is achieved, the system performance is remarkably improved, and the application scene of the system is expanded.

The multi-vehicle-type random switching flexible total splicing system comprises a splicing platform and part feeding areas, and side walls on the two sides of the same vehicle type are stored in the part feeding areas on the two sides of the splicing platform correspondingly; the workpiece feeding area comprises a workpiece feeding rail and storage rails, the storage rails are located on the two sides of the workpiece feeding rail, a splicing sliding table and a welding robot sliding table are arranged on the workpiece feeding rail, a clamp, a movable tool table and a traction trolley are arranged on the storage rails, the traction trolley is connected with the movable tool table, and the clamp is fixed to the movable tool table and connected with a two-way pneumatic-electric switching assembly. And the clamp is kept in a clamping state when clamping the side wall. Compared with the prior art, the device has the advantages that the clamp is fixed to the movable tool table and connected with the two-way pneumatic-electric switching assembly, an air source and electric power are provided for the clamp, power and control signals are kept uninterrupted in the clamp transportation process, the clamp is kept in the clamping state, the position of the side wall is not changed, and the accuracy of the splicing position of the side wall is guaranteed.

The invention provides a sensor network distributed filtering method and system based on adaptive event triggering under replay attack and topology switching, and relates to the technical field of signal processing. The invention aims to solve the problem that the estimation performance is reduced when the existing distributed filtering method has the problems of communication resource limitation, topology random switching, replay attack and the like in a sensor network. The method is characterized by comprising the following steps: establishing a state space model and a sensor output model of a discrete nonlinear time-varying stochastic system, and adopting a self-adaptive event triggering mechanism to enable the measurement of a distributed filter to be available; a replay attack compensation mechanism is established, and the influence caused by the replay attack on the sensor network is processed in time; the developed adaptive event-triggered distributed filter design algorithm is in a recursive form and is very suitable for online application. The method can effectively cope with multiple challenges such as bandwidth limitation, topology change and network security threats, has good applicability and practicability, and is more suitable for practical engineering application.

The invention provides a dual-random control method and system combining a dual-three-phase motor random switching sequence and a random carrier frequency. When a dual three-phase motor adopts space vector pulse width modulation, concentrated high-frequency harmonic waves exist at the switching frequency and the integral multiple of the switching frequency of phase current, and vibration noise is caused. The invention provides a double-random control method for a double-three-phase motor to suppress high-frequency harmonic waves, two different switch sequences are designed in each sector, and one switch sequence is selected through random numbers in each carrier period. And in the aspect of random carrier frequency, random number constrained variable delay control is provided, so that the carrier period is randomized, the high-frequency harmonic amplitude of the dual three-phase motor is finally reduced, and the vibration and noise of the motor are suppressed.

The invention discloses a two-path switching data weighted average circuit and an analog-to-digital converter, and belongs to the technical field of signal processing.The two-path switching data weighted average circuit comprises a first data selector, a second data selector, a first DWA sub-circuit and a second DWA sub-circuit, the input end of the first data selector is connected with a binary input signal, and the input end of the second data selector is connected with a binary output signal; the first output end and the second output end of the first data selector are respectively connected with the input end of the first DWA sub-circuit and the input end of the second DWA sub-circuit, and the output end of the first DWA sub-circuit and the output end of the second DWA sub-circuit are respectively connected with the first input end and the second input end of the second data selector. Based on the characteristic that an input signal has randomness, according to the fact that the lowest bit of the input signal is' 0 'or' 1 ', random switching is carried out in two paths of data weighted average circuits, and spurious generation is restrained.

1. The name of the design product: the main body of the expression input graphical user interface for electronic devices. 2. The use of the design product: an electronic device. 3. The design points of the design product: the part in the graphical user interface, the part outside the dotted line is the claimed part. 4. The picture or photo that best shows the design points: design 1 front view. 5. Design 1 is designated as the basic design. 6. The use of the graphical user interface: the overall interface is used for expression input and sending; the claimed part of the interface is used for expression assembly and switching. 7. The human-computer interaction mode of the graphical user interface: in design 1 front view, the user can click the "complete" control to enter the current expression combination into the input box, long press the rounded rectangle expression card control to expand the preview switching window of the corresponding expression library, click the "structure" control to switch the card structure, and click the "random" control to randomly switch the expression combination under the current card structure. The human-computer interaction modes of design 2 and design 3 are the same as those of design 1. In design 4 front view, the user can click the "complete" control to enter the current expression combination into an input box, long press the rounded rectangle expression card control to expand the preview switching window of the appropriate expression library, click the "structure" control to switch the card structure, click the "random" control to randomly switch the expression combination under the current card structure, and click the color disc control at the bottom of the interface to select the color combination to randomly generate the expression combination with the corresponding color. In design 5 front view, when the user clicks the "+ expression combination" control, it enters design 5 interface change state diagram 1; when the user clicks the "complete" control, it enters design 5 interface change state diagram 2. In design 6 front view, when the user clicks the "+ expression combination" control, it enters design 6 interface change state diagram 1; when the user clicks the "structure" control, it randomly switches the expression card structure and enters design 6 interface change state diagram 2. In design 7 front view, when the user clicks the "+ expression combination" control, it enters design 7 interface change state diagram 1; when the user clicks the "random" control, it randomly switches the expression combination and enters design 7 interface change state diagram 2. In design 8 front view, when the user clicks the "+ expression combination" control, it enters design 8 interface change state diagram 1; when the user long presses the leftmost expression card control, it enters design 8 interface change state diagram 2. In the design 9 main view, when the user clicks the "+ emotion combination" control, enter the design 9 interface change state diagram 1; when the user long-presses the middle expression card control, enter the design 9 interface change state diagram 2. In the design 10 main view, when the user clicks the expression combination control at the lower right of the "+ emotion combination" button twice, enter the design 10 interface change state diagram 1; when the user clicks the "send" control, enter the design 10 interface change state diagram 2.

The utility model discloses a pen capable of randomly switching and displaying patterns, which comprises a penholder, a refill, a first spring and a telescopic locking mechanism are respectively arranged in the penholder, a button is movably arranged at the rear end of the penholder, the first spring is arranged between the refill and the penholder, and the rear end of the refill is in linkage fit with the front end of the button through the telescopic locking mechanism. The pen holder is further connected with a pattern random switching display device, the pattern random switching display device comprises a shell, a rotating disc and a transmission piece, the shell is connected to the outer side of the pen holder and located on the side portion of the rear end of the pen holder, the rotating disc is rotatably arranged in the shell, a plurality of patterns are arranged at one axial end of the rotating disc, the shell is provided with a window, and the transmission piece is connected with a button. And the front end of the transmission part is in transmission fit with the turntable. The pen capable of randomly switching the display patterns is simple in structure, convenient to assemble and better in holding feeling.

The application relates to a high-frequency harmonic suppression method based on a motor control system, in particular to the technical field of motor control, and comprises the following steps: S1, calculating a modulation rate according to collected motor rotating speeds; S2, comparing the collected motor rotating speeds with preset motor rotating speeds n1, and taking different modes to suppress high-frequency harmonics according to comparison results; S3, when the motor rotating speed is less than n1, a random switching frequency method is used to suppress high-frequency harmonics in an asynchronous modulation mode; S4, when the motor rotating speed is greater than or equal to n1 and the modulation rate is less than a preset modulation rate k1, a random zero vector method is used to suppress high-frequency harmonics; and S5, when the motor rotating speed is greater than or equal to n1 and the modulation rate is greater than or equal to k1, an SVPWM method is used to suppress high-frequency harmonics. Different harmonic suppression modes are set according to different scenes, and the efficiency of suppressing harmonics is effectively improved.

The utility model provides an angle adjusting mechanism and a projector support, which belongs to the technical field of machinery and specifically comprises a fixed seat, a gear ring, a movable part, a fixed shaft, an elastic block assembly, an adjusting rod assembly, a gasket and a screw. According to the technical scheme, the adjusting rod with coaxial cylindrical sections of different diameters is adopted to be matched with the elastic block assembly and the gear ring, angle adjustment is achieved, random switching between a locking state and an unlocking state can be achieved, and the structure is simple.

The utility model relates to the technical field of card feeding devices, in particular to a card feeding device capable of switching double card boxes, which comprises a printing piece, a card feeding device shell is fixed at the front end of the printing piece, a push-in mechanism used for pushing in cards is arranged on one side of the card feeding device shell, and the printing piece is fixed on the printing piece. A clamping mechanism used for clamping cards is arranged in the card feeding device shell, and a switching mechanism used for switching the card boxes is arranged in the printing piece. And the switching mechanism comprises a first printing head, the first printing head is arranged at the lower end of the interior of the printing piece, a second printing head is installed above the first printing head, and connecting pieces are fixed to the right side of the second printing head and the right side of the first printing head correspondingly. Through the arranged switching mechanism, the upper surface and the lower surface of the card can be printed, then the effect of switching the double card boxes is achieved, random switching can be achieved in the printing process, the card does not need to be taken out and placed again, and the printing efficiency is improved.

The utility model discloses a folding type fruit and vegetable plastic box which comprises a fixed box body, the fixed box body comprises a bottom plate located at the bottom, two opposite first fixed side plates and two opposite second fixed side plates, the two first fixed side plates and the two second fixed side plates are fixedly connected to the upper surface of the bottom plate, a first movable plate is arranged between the two first fixed side plates, and a second movable plate is arranged between the two second fixed side plates. A second movable plate is arranged between the two second fixed side plates, and a first mounting clamping strip is arranged on the upper surface of the first fixed side plate; compared with the prior art, when the size of the fruit and vegetable plastic box needs to be reduced, storage of the first movable plate and the second movable plate is achieved, the interior of the fruit and vegetable plastic box is partitioned, when the size of the fruit and vegetable plastic box needs to be enlarged, overall capacity expansion of the fruit and vegetable plastic box can be achieved, the structure is simple, operation is convenient and fast, and practicability is high. Random switching can be achieved according to actual requirements, and the use flexibility of the fruit and vegetable plastic box is greatly improved.

The invention discloses an oversampling successive approximation type analog-to-digital converter for suppressing capacitor mismatch. The oversampling successive approximation type analog-to-digital converter comprises a sampling switch, a high-order equivalent capacitor array, a binary weighted capacitor bank, a C-2C step network, a comparator, a noise shaping module, a successive approximation control logic and a dynamic element matching circuit, wherein the successive approximation control logic module performs time domain modulation on the binary weighted capacitor bank and the C-2C ladder network, and harmonic waves caused by capacitor mismatch are shifted to a high frequency band; the dynamic element matching circuit performs pseudo-random switching control on the high-order equivalent capacitor array, and harmonic energy caused by element mismatch is averaged and then transferred to the noise floor of a frequency spectrum by using the rotation selection circuit. The noise shaping module forms a loop through a residual voltage feedback mechanism and pushes quantized noise away from a signal frequency band; on the premise that an additional calibration circuit is not introduced, the problem of performance deterioration caused by capacitor mismatch due to manufacturing process fluctuation of a traditional successive approximation type framework is effectively restrained, the overall precision and linearity of analog-to-digital conversion are remarkably improved, and the analog-to-digital conversion circuit is suitable for high-resolution application scenes.

The invention relates to the technical field of motor control, and particularly discloses a double-random PWM motor noise suppression method based on a Mersen rotation algorithm. Comprising the following steps that S01, double random modulation is established, the double random modulation comprises random pulse position modulation and random switching period modulation, the random pulse position modulation is used for conducting controllable random offset on the geometric center position of a carrier signal, and the random switching period modulation is used for conducting random offset on the geometric center position of the carrier signal; the random switching period modulation changes the frequency fs of the triangular carrier wave to realize randomization of the random switching period Tn of the system; and S02, generating a pulse position offset coefficient required by random pulse position modulation and a periodic random number required by random switching period modulation by adopting a Meisson rotation algorithm, and dispersing PWM harmonic energy to other frequency intervals so as to suppress a switching frequency sub-harmonic amplitude and a switching frequency sub-second harmonic amplitude.

The application discloses a harmonic suppression method and device for silicon carbide semiconductors and a storage medium, belongs to the technical field of semiconductor design, and comprises the following steps: obtaining random numbers under a target number through a two-state Markov chain random number generator; performing asymmetric processing on the action time of a basic vector pair under the target logarithm through the random numbers in a random pulse position harmonic suppression method; performing adaptive improvement on a triangular carrier signal in a PWM waveform for the basic vector pair after the asymmetric processing; and performing modulation judgment on the opening and closing states of each silicon carbide semiconductor in a three-phase inverter bridge according to the improved triangular carrier signal, and obtaining a required asymmetric pulse signal. The asymmetric random pulse signal disperses high-frequency harmonics concentrated around the switching frequency and multiples to a greater extent, achieves the purposes of random zero vector step and random switching frequency, and reduces harmonics in a low-frequency operation state of a motor and EMI noise in a high-frequency operation state.

A wafer sorting machine feeding mechanism supporting multiple sizes of silicon wafers and a use method thereof, including a wafer loading frame, the wafer loading frame is provided with a track and a wafer push door guide slot plate on the side, the track is matched with a sliding block, the sliding block is connected with a rotating shaft fixed block, and the rotating shaft fixed block is rotatably provided with a rotating shaft; the wafer loading frame is detachably connected with a push door structure plate through the rotating shaft, the push door structure plate is detachably connected with a push piece structure plate, the push piece structure plate is connected with a wafer push plate, and the edge of the wafer push plate is provided with a soft material wafer push block; the wafer loading frame includes an upper top plate and a lower bottom plate, the upper top plate and the lower bottom plate are provided with side baffle adjustable waist holes, the side baffle adjustable waist holes are connected with side baffles through adjusting screws, the side baffles are connected with front baffles through adjusting screws, and the front baffles are provided with front baffle adjustable waist holes. The present application can realize convenient operation personnel detection of silicon wafers and realize random switching of multiple size wafer feeding.

The invention discloses a method for controlling and suppressing high-frequency noise of a DCDC converter through a double random algorithm. The method comprises the following steps that the application range of the random switching frequency of an IGBT is obtained; the method comprises the following steps of: controlling the switching frequency of an IGBT (Insulated Gate Bipolar Translator) to realize random change in a controllable application range in each PWM switching period through a double random algorithm, and carrying out random pulse output weight distribution according to a calculated and output PWM duty ratio in each PWM switching period, and randomly cutting a complete PWM wave into a plurality of PWM waveforms with different weight ratios under different time sequences; and forming an output random pulse according to a pulse sending mechanism so as to suppress the high-frequency noise of the DCDC converter. According to the method, through random IGBT switching frequency and random monopulse distribution and weight ratio, fixed noise distribution under traditional control is broken, noise spectrum characteristics are changed, peak clipping and valley filling are carried out especially for a high-frequency part, and high-frequency noise generated by the DCDC converter is effectively suppressed on the premise that the control effect is ensured to be consistent.

The invention relates to the technical field of mechanical arm control, in particular to a flexible tracking control method for randomly switching a mechanical arm system with unmodeled dynamics, which comprises the following steps of: constructing a mechanical arm kinetic equation, considering the unmodeled dynamics, obtaining state space representation, and establishing a nonlinear system state equation with output constraint; flexible preset performance is designed based on the mechanical arm system, error transformation is carried out, and a tracking error model is established; using a radial basis function neural network to approach an unknown physical nonlinear term corresponding to the mechanical arm system, and designing an adaptive law; introducing coordinate transformation and separation variables according to a nonlinear system state equation with output constraint, and iteratively designing a controller by adopting a backstepping method through a tracking error model; flexible pre-setting performance, flexible pre-setting performance, a self-adaptive law and a controller are integrated, an average residence time switching law is designed to restrain system mode switching, and a self-adaptive closed-loop control mechanical arm system capable of stably running under unmodeled dynamic and random switching is jointly established.

The utility model provides an anti-rollover sitting and lying device. The anti-rollover sitting and lying device comprises a base and a frame body arranged on the base, the frame body at least comprises a back bracket of which the angle can be freely changed relatively, and the back bracket can be switched between an inclined state and a horizontal state; a tipping prevention component is correspondingly arranged on the base; the rollover prevention component is suitable for abutting against the back support when the back support is overturned backwards to be in the horizontal state, so that the back support in the inclined state can be rapidly limited to be in the horizontal state after rotation, and the frame body is prevented from being overturned backwards. The back support can be accurately and rapidly switched between the inclined state and the horizontal state through the rollover prevention component, when the back support rotates to the horizontal state from the inclined state, the rollover prevention component can rapidly position and stabilize the position of the back support, it is guaranteed that random switching can be accurately in place, and the safety of the back support is guaranteed. And the problem that the angle is inaccurate or the position is deviated possibly when the angle of the traditional sitting and lying bed is changed is solved.

A quantum communication system 100 for distributing a quantum key between a first party and a second party. The system comprises a first transmitter 214, a first receiver 222, a second transmitter 224 and a switching assembly comprising optical switches 216 and 226. The switching assembly is switchable between a first configuration and a second configuration. The first configuration is for distributing a quantum key and the second configuration is a testing configuration. In the first configuration the first transmitter and the first receiver are connected by a first optical path 240 and in the second configuration the second transmitter and first receiver are connected by a second optical path which is a trusted channel. The second transmitter and first receiver are under the control of the same party and may be located within a unit 220. A controller may be configured to operate the switching assembly and to randomly switch between the first and second configurations. A second testing configuration may be used that introduces an untrusted section into the second optical path, i.e. a part of the first optical path.

The application discloses a method for realizing signal MASK preprocessing based on a self-selection RRAM array and application, and belongs to the field of novel storage and calculation. The application utilizes the fact that devices in the self-selection RRAM device array are initially in a high resistance state, and after inputting a pulse with a fixed pulse width and amplitude to each row of devices in the array in turn, the devices are switched to a RRAM mode or an IMT mode under the action of the same pulse, threshold conversion voltages corresponding to the two modes are different, the threshold conversion voltage (V set ) in the RRAM mode is greater than the threshold conversion voltage (V th ) in the IMT mode, and thus a random MASK matrix is generated. The application improves the efficiency of input signal processing, and is of great significance to reservoir computing.

The utility model discloses an outdoor appliance capable of randomly switching between a sunshade and a tent, which comprises a support framework and a sunshade cover formed by splicing a plurality of unit umbrella covers, and is characterized in that a first zipper is respectively arranged on the exposed end surface of each unit umbrella cover, and a second zipper is respectively arranged on the exposed end surface of each unit umbrella cover. And the two half zippers of each first zipper are respectively diverged to form a V shape. According to the utility model, the sunshade and the tent which have similar functions and can be used in different time are integrated and designed into one product, so that the camping carrying capacity is reduced, but respective functions are not lacked for use, and the advantages of portability, comfort, functionality, safety and the like are realized.

The utility model discloses a cleaning water tank, which comprises a tank body (1), and is characterized by further comprising a separation assembly (2) which can be detachably arranged in the tank body (1), and the separation assembly (2) is vertically arranged in the tank body (1) under the state that the separation assembly (2) is arranged in the tank body (1). The partition assembly (2) is arranged in the groove body (1) and divides an inner cavity of the groove body (1) into a first cavity (101) located on the left side and a second cavity (102) located on the right side, and the volume of the first cavity (101) and the volume of the second cavity (102) are determined by the installation position of the partition assembly (2). Compared with the prior art, the cleaning water tank disclosed by the utility model can realize random switching between a large single tank and double tanks.

The self-locking double-drinking cup convenient to operate comprises a cup body and a cup cover, the cup cover comprises a bottom cover, an overturning cover and a top cover, the bottom cover is screwed to a cup opening of the cup body, the overturning cover is rotationally installed on one side of the bottom cover, the top cover is rotationally installed on the rotating installation side of the overturning cover, a first lock catch is rotationally installed on the other side of the bottom cover, and a second lock catch is rotationally installed on the other side of the top cover. The first lock catch is installed on one side of the bottom cover and used for locking the opening side of the turnover cover, a push key capable of moving up and down is installed on the other side of the bottom cover and located on the outer side of the first lock catch, and a second lock catch is slidably installed on the opening side of the turnover cover and used for locking the opening side of the top cover; when the bottom of the push key is pressed, the upper end of the first lock catch deflects outwards, and the overturning cover is unlocked; the push key is pushed upwards, the second lock catch is extruded inwards, and the top cover is unlocked. Free selection and random switching of direct drinking and suction drinking can be achieved by operating one push key, and great convenience is brought to operation of a user.

The application discloses a robust model predictive fault tolerant switching control method for injection molding pressure maintaining process with fault recovery, which aims to realize random switching between normal control strategy and fault tolerant control strategy, so that the system can cope with uncertainties and potential faults in the running process in a probabilistic manner, and belongs to the field of advanced control of industrial processes. The method comprises the following steps: step 1, constructing a mathematical model of injection molding pressure maintaining process with fault recovery; step 2, designing a robust model predictive fault tolerant switching controller; and step 3, obtaining real-time control law gain, compensation coefficient and switching coefficient of the system by solving sufficient conditions of robust positive invariance set and terminal constraint set. The application innovates the design of the controller by introducing probability, so that the controller can dynamically adjust between normal and fault tolerant modes, and ensure safe and efficient operation of the system.