50results about How to "Avoid encroachment" patented technology

The invention discloses a wireless router access management method and system and a wireless router, relates to the technical field of wireless routers, and remarkably improves network security and resource utilization efficiency through multiple authentication and a dynamic management mechanism. According to the system, first behavior characteristic data and network state data of equipment are collected, intelligent analysis is carried out in combination with a CNN model, and the security of the access equipment is judged in real time. For equipment meeting the security standard, the system automatically allocates bandwidth and provides continuous network service, and for abnormal equipment, the system blocks access of the abnormal equipment in time through multiple rounds of authentication and load evaluation, so that the security and stability of a network environment are ensured. In the aspect of bandwidth management, the system intelligently sorts and dynamically allocates bandwidth resources according to the second access safety index # imgabs0 # and bandwidth requirements of the access equipment, and low efficiency and resource waste of a traditional static allocation mode are avoided.

The utility model discloses a cleaning base station and a cleaning system. The cleaning base station (1000) comprises: a base (10); the cleaning assembly is connected with the base (10); the scraping cleaning part (30) is mounted on the cleaning assembly and used for cleaning the cleaning assembly; the transmission device is connected with the scraping and cleaning piece (30) and used for enabling the scraping and cleaning piece (30) to move; the driving assembly is arranged on the base (10) and connected with the transmission device; and in the height direction of the base (10), the projection, on the base (10), of the driving assembly and the projection, on the base (10), of the cleaning tray (20) are staggered.

The invention relates to the technical field of civil engineering, and discloses a shotcrete operation trolley and a construction method thereof.The shotcrete operation trolley comprises an anchor shotcrete trolley bearing all parts needed by anchor shotcrete, an annular frame installed in the middle of the anchor shotcrete trolley and used for arranging an overall structure of an anchor shotcrete system; the annular trolley is installed on the periphery of the annular frame and used for moving along the tunnel section and conducting concrete spraying operation, and the longitudinal trolley is installed on the annular trolley spray anchor track beam and used for moving a spray anchor head back and forth and conducting concrete spraying operation. The axis of the shotcreting and anchoring trolley is adjusted to coincide with the designed axis of a tunnel before shotcreting and anchoring, the distance between the shotcreting and anchoring head and the designed shotcreting and anchoring face is a fixed value, the distance between the shotcreting and anchoring face and the designed shotcreting and anchoring face is monitored in real time through a sensor, shotcreting and anchoring operation is accurately controlled, the secondary lining range is effectively prevented from being occupied by the shotcreting and anchoring operation, construction quality is improved, rework is reduced, and construction efficiency is improved. The cost is reduced, and the automation degree and efficiency of operation are remarkably improved.

The utility model discloses a multifunctional bladeless fan, including frame, set up the detachable multifunctional module of frame, set up the fan subassembly in the frame, the installation platform of subsidence for installing multifunctional module is provided on the frame top, and the air outlet that is communicated with fan subassembly is established around the installation platform, the ring wall of installation platform is evenly provided with first connecting piece, and the multifunctional module includes the installation base, and the second connecting piece is provided on the installation base, and the screwing of second connecting piece and first connecting piece can make multifunctional module install and fix in installation platform. Through the topology structure design of setting up central detachable multifunctional module and subsidence type installation platform, realize the high expansibility of equipment function, and the user can replace the module such as sound box, air purifier through the screwing fast, break through the technical limitation of traditional bladeless fan function single.

The invention discloses a hinge assembly and electronic equipment. The hinge assembly comprises a base, a first swing arm, a second swing arm and a damping mechanism. The first swing arm is rotationally connected with the base and provided with a first driving wheel. The second swing arm is rotationally connected with the base and provided with a second driving wheel. The damping mechanism comprises a deformable elastic piece, a first driven wheel meshed with the first driving wheel and a second driven wheel meshed with the second driving wheel, the first driven wheel and the second driven wheel are arranged on the base in a sliding mode and are limited to rotate, and the overall outline of the elastic piece is of a flat block-shaped structure. According to the hinge assembly, the overall outline of the elastic piece providing the damping hand feeling force is of the flat block structure, the occupied size in the thickness direction is small, and therefore the arrangement space of the base can be prevented from being occupied, it is ensured that the base has the enough thickness to meet the impact strength, and the service life of the base is prolonged. And therefore, the risks of deformation and breakage of the hinge assembly are reduced.

The utility model relates to a rail transit vehicle emergency evacuation door, in particular to a multifunctional large-opening-degree evacuation door leaf which comprises a door leaf body. Front window glass (1), a window wiper (2), a head lamp (3), a traveling lamp (4) used for indicating the traveling direction of a vehicle, a sunshade curtain (5) used for shielding sunlight, a rainfall sensor (6) used for detecting the rainfall amount, a decorative top plate (7) and a shielding plate (8) are installed on the door leaf body. The rain wiper has the functions of railway vehicle operation indication, sun shading, rainfall induction and adjustment of the working frequency of the rain wiper, decoration and shielding.

This application provides an RDMA / TCP dual-transmission plane collaborative QoS scheduling method and system, including establishing Remote Direct Memory Access (RDA) read / write token buckets and Transmission Control Protocol (TCP) read / write token buckets for the same tenant at the block device layer; configuring a first time slice granularity and a first smoothing suppression strength for the RDA plane, and configuring a second time slice granularity and a second smoothing suppression strength for the TCP plane; collecting the flow control trigger count, explicit congestion notification marking count, and retries count of the previous plane, and the round-trip delay, retransmission count, and congestion window size of the subsequent plane, and adjusting the filling rate and suppression parameters of the corresponding token buckets accordingly; when any plane fails, newly arriving IO requests are bound to the token bucket scheduling of the healthy plane, and in-process IO requests that have been admitted through the failed plane and issued before the failure continue to execute. This application implements protocol-differentiated rate control, network state adaptive adjustment, and transparent fault migration.

The application discloses a shape memory composite component without external heating components, which comprises a plurality of resin-based carbon fiber layers, the projection shape of the composite material in the thickness direction is rectangular, two electrode sheets are arranged in the resin-based carbon fiber layers, and the two electrode sheets are arranged between two resin-based carbon fiber layers, the layer angles of the two resin-based carbon fiber layers on the two sides of the electrode sheets are both 0° direction, and the two electrode sheets are away from and respectively arranged at the two ends of the 0° direction; the electrode sheets are provided with openings, and the electrode sheets are connected with wires. The shape memory composite material structure is provided with electrodes, the carbon fiber electric heating performance is used to complete temperature rise to realize shape recovery of the shape memory composite material. The problems of invasion of the heating components into the deformation space of the shape memory structure, reduction of the deformation capacity of the structure, increase of the folding stress of the shape memory composite material and material damage caused by the folding stress are effectively solved.

This utility model relates to the field of automotive seat technology, specifically to a front-row car backrest folding structure, including a base, a pulling component, a pushing component, a limiting block, a rotating block, and a backrest frame. When the backrest frame needs to be folded, the pulling component is pulled, which drives the pushing component to rotate. The pushing component pushes the limiting block to rotate away from the rotating block until the limiting block releases its restriction on the rotating block. At this point, the backrest frame can be pulled to rotate towards the base, folding the backrest frame. After folding, the limiting block returns to its original position, thus limiting the backrest frame. This utility model uses a cable-driven and rotating rod-linked mechanical structure to replace the traditional multi-link / hinge system, reducing the number of components by more than 40%. The overall structural thickness is reduced by 30%-50% compared to traditional designs, effectively avoiding encroachment on the legroom of the driver's cabin, thereby solving the problem of the large size and space occupation of existing front-row folding structures.

The present invention provides a PTFE-TiSO-Ti ternary hydrophilic / oleophobic penetrating membrane electrode and a preparation method for efficiently electrocatalytically treating oily wastewater, and relates to the technical field of water treatment. The PTFE-TiSO-Ti ternary hydrophilic / oleophobic penetrating membrane electrode is a ternary composite membrane electrode in which a titanium mesh is modified by titanium oxide and polytetrafluoroethylene, showing hydrophilicity and underwater superoleophobicity, with a water contact angle of 42.9° in air and an underwater oil contact angle of 125.8°. The PTFE-TiSO-Ti ternary hydrophilic / oleophobic penetrating membrane electrode for efficiently electrocatalytically treating oily wastewater proposed by the present invention is a new type of electrode material that has both hydrophilicity and underwater superoleophobicity, which can not only prevent oil pollution from occupying electrode active sites and maintain efficient oily wastewater treatment, but also reduce the pollution of oil pollution to the electrode and extend the service life of the electrode.

The invention provides a fluorine pump compression refrigerating system and a control method thereof.The system comprises an evaporator, a condenser, a fluorine pump and a throttling element, the throttling element is connected between an outlet of the condenser and an inlet of the evaporator, a liquid storage tank is connected between the condenser and the throttling element, and the fluorine pump compression refrigerating system further comprises a refrigerant adjusting tank; the top of the refrigerant adjusting tank communicates with the top of the liquid storage tank through a first pipeline, the bottom of the refrigerant adjusting tank communicates with the top of the liquid storage tank through a second pipeline in a controllable on-off mode, and the fluorine pump can pump the liquid refrigerant in the liquid storage tank into the refrigerant adjusting tank to be stored in the refrigerant adjusting tank. The redundant refrigerant can be accurately and reliably adjusted, when the system operates in the compression refrigeration mode, the fluorine pump which is idle and does not work is used for transferring and storing the redundant liquid refrigerant into the refrigerant adjusting tank, and the situation that excessive refrigerant exists in the refrigeration system and occupies a heat exchange pipeline in a heat exchanger is prevented.

This disclosure provides a water tank assembly, a cleaning device, and a cleaning system. The water tank assembly is installed on the cleaning device and includes a water tank and an overflow structure. The water tank includes a receiving cavity. The overflow structure includes an overflow pipe and a first overflow port and a second overflow port respectively disposed at both ends of the overflow pipe. The first overflow port and at least a portion of the overflow pipe are disposed within the receiving cavity, and the first overflow port is located at a predetermined overflow height within the receiving cavity. The second overflow port is positioned below the first overflow port and connects to the outside of the receiving cavity. By placing the overflow structure within the receiving cavity inside the water tank, the encroachment of traditional external overflow structure designs on the compact installation space of the cleaning device is avoided, reducing the overall volume and space occupation of the water tank assembly and improving the overall layout optimization of the cleaning device. Simultaneously, the overflow structure offers greater design freedom and fewer spatial constraints.

This application belongs to the field of shipbuilding, specifically disclosing a methanol-fueled single-fuel bulk carrier, which includes a hull and a main deck mounted on the hull. A propeller and a propulsion motor are fixedly installed at the stern of the hull, and the propulsion motor and propeller are connected in a drive connection. A methanol fuel generator electrically connected to the propulsion motor is installed in the engine room at the stern of the hull. A methanol fuel tank for supplying fuel to the methanol fuel generator is located at the stern of the main deck. The methanol fuel tank is a C-type tank, and a fuel tank connector is provided on one end of the methanol fuel tank to connect with it and form an integral part thereof. Through the structural design of this application, zero sulfur emissions and low nitrogen oxide emissions of the ship are achieved, which can meet the environmental protection requirements of green development of inland waterway shipping. At the same time, the height of the ship above the waterline is effectively controlled, which can adapt to complex navigation conditions such as bridge height restrictions, water depth during the dry season, and lock size restrictions in the Huaihe River Basin, significantly improving the ship's throughput capacity and operational economy.

The application relates to the technical field of secondary batteries and discloses a shell assembly of a battery, the battery, a battery pack and a power utilization device. The shell assembly comprises a shell which comprises integrally formed first and second shell walls, the second shell wall extends in a direction perpendicular to the first shell wall, and the second shell wall is connected to the periphery of the first shell wall at one end thereof in the extension direction of the second shell wall; the first and second shell walls jointly enclose a containing space, and the end of the second shell wall away from the first shell wall has an opening which is in communication with the containing space; the composition of the shell comprises titanium elements, the mass content A% of the titanium elements is 99%-99.9%, the hardness of the shell is C HV, the perpendicularity of the second shell wall in the extension direction thereof is m (mm) with the first shell wall as a reference surface, and 16.5<=Cm<=40 is met. The application can improve the strength of the shell and the forming yield of the shell.

The utility model relates to the technical field of batteries, and discloses a battery module which comprises a battery cell, a buffer structure and colloid, the plurality of battery cells are arranged side by side along a first direction, and each battery cell is provided with two first side surfaces which are oppositely arranged along the first direction; a buffer structure is arranged between two adjacent battery cells, a glue injection groove is formed in the buffer structure, a buffer groove is defined by the buffer structure, and the first side surfaces of the two adjacent battery cells are arranged at intervals through the buffer groove; the colloid is arranged in the glue injection groove, and the first side faces of the two adjacent battery cells are bonded through the colloid. According to the utility model, the buffer groove is arranged to provide a buffer space for the expansion of the battery cell in the circulation process, so that the expansion of the battery cell in the circulation process can be borne by the buffer groove, and the circulation attenuation caused by overlarge internal pressure due to overlarge expansion in the later period of the battery cell circulation is avoided; the glue injection groove is formed in the buffer structure, so that the pouring space of the glue is limited, the glue is prevented from occupying the buffer space, and the structural strength of the battery module is enhanced.

The invention provides a vehicle storage structure and an automobile, and relates to the field of automobile design and manufacturing. The invention discloses a vehicle storage structure which comprises a rear floor, a storage cover plate and at least one hinge piece. A storage space with an opening facing the Z direction is formed in the rear floor. The hinging piece is arranged in the storage space and is connected with the rear floor; the storage cover plate is connected with the hinge piece, and the storage cover plate is arranged to be capable of opening or closing the storage space through the hinge piece; when the storage cover plate closes the storage space, the storage cover plate and the rear floor can jointly form a flat surface. By means of the vehicle storage structure, the space utilization rate of the vehicle can be increased, and the storage capacity of the vehicle is remarkably improved.

The invention relates to the technical field of computer vision, and discloses an image forgery detection model interpretability analysis method and system, and the method comprises the steps: extracting the middle layer features of an image forgery detection model to be interpreted, and generating a semantic feature map based on the non-negative matrix decomposition of sparsity constraint; performing feature importance pre-screening on the semantic feature map to obtain an important feature map; for each important feature map, positioning a high activation area and extracting an image block, and analyzing a dominant frequency component and a bandwidth of the image block corresponding to the high activation area; constructing a band elimination filter in the frequency domain of the original image, generating a disturbance image, and endowing each feature with an initial weight based on a decision distance; and performing grouping fusion on the features according to the symbols of the initial weights, and respectively generating final visual saliency evidence graphs which support counterfeiting and reality. According to the invention, through combination of the non-negative matrix factorization and the frequency domain disturbance shielding method, the interpretability of the image forgery detection model can be effectively improved.

The invention discloses a graded porous metal selenide for a water decomposition reaction and a preparation method and application thereof.The preparation method comprises the steps that a mixed solution of metal-organic frameworks (MOFs), graphene oxide (rGO), carbon nanotubes (CNTs) and nanocellulose (CNFs) is subjected to directional freeze drying, and a three-dimensional porous carbon framework loaded with the MOFs is obtained; and then carrying out high-temperature selenylation treatment on the obtained three-dimensional porous framework to form the electrocatalytic composite material consisting of a carbon skeleton and selenide on the carbon skeleton. In the process, the MOFs can be uniformly dispersed on a carbon skeleton composed of rGO, CNTs and CNFs, so that the agglomeration phenomenon of the MOFs can be reduced in the selenylation process, and the MOFs are uniformly dispersed to expose more active sites; and meanwhile, the directional pore channels are beneficial to overflow of bubbles in the water decomposition reaction process, so that active sites are prevented from being occupied by accumulation of the bubbles, and the electro-catalytic performance of the selenide is further improved.

The invention provides a fluorine pump compression refrigerating system and a control method thereof.The system comprises an evaporator, a condenser and a throttling element, the throttling element is connected between an outlet of the condenser and an inlet of the evaporator, a liquid storage tank is connected between the condenser and the throttling element, and the fluorine pump compression refrigerating system further comprises a refrigerant adjusting tank; the top of the refrigerant adjusting tank communicates with an outlet of the evaporator through a first pipeline, the bottom of the refrigerant adjusting tank communicates with the top of the liquid storage tank through a second pipeline in a controllable on-off mode, and the bottom of the refrigerant adjusting tank further communicates with a liquid inlet of the throttling element through a third pipeline in a controllable on-off mode or communicates with a liquid outlet of the liquid storage tank in a controllable on-off mode. Refrigerant migration is achieved by controlling connection and disconnection of the second pipeline and the third pipeline, accumulated liquid retention in the system caused by too large refrigerant filling amount in the system is effectively prevented, excessive refrigerant in the refrigerating system is prevented from occupying a heat exchange pipeline in the heat exchanger, and the heat exchange efficiency is improved.

The utility model provides a material lifting platform, which belongs to the technical field of material carrying, and comprises a pneumatic telescopic mechanism vertically arranged in a support block, the pneumatic telescopic mechanism comprises a piston rod capable of moving up and down on the support block, the piston rod is connected with a lifting plate, and the lifting plate is connected with a transmission assembly. A plurality of guide rods are arranged on the side wall, close to the lifting plate, of the supporting block, guide grooves corresponding to the guide rods are formed in the side wall of the lifting plate, and the guide rods are inserted into the guide grooves and used for guiding and restraining the moving track of the lifting plate; according to the lifting plate guide structure, the working space occupied by the lifting plate guide structure can be reduced, and the maintenance efficiency can be improved.

The present invention discloses a braking system and an electric drive axle, wherein the braking system comprises a bracket, a camshaft, an adjusting arm, and a brake air chamber; the bracket is provided with an inner end face, an outer end face opposite to the inner end face, and a side face located at the periphery of the bracket, and a avoidance groove is provided on the bracket, wherein the avoidance groove forms a first opening on the inner end face and a second opening on the side face; the camshaft is pivotally connected to the bracket; the adjusting arm is located on the inner side of the inner end face of the bracket, and comprises a first end connected to the camshaft, and a second end away from the first end, and the portion of the adjusting arm located at the first end and the second end is placed in the avoidance groove, and the second end is located between the inner end face and the outer end face of the bracket; the brake air chamber is installed on the bracket, and the push rod of the brake air chamber is connected to the second end of the adjusting arm. The present invention meets the braking requirements of the vehicle and avoids the brake air chamber from occupying the internal space of the vehicle.

This application discloses a composite bent waveguide, a forming mold, and a forming method. The composite bent waveguide includes a tube body and pipe joints at both ends of the tube body. The tube body has a rectangular cross-section, with a first bend in its width direction and a second bend in its height direction. The mold includes a base, a pressure plate, a forming plate, a triangular bending plate, and an extrusion device. The mold disclosed in this application can alternately and continuously bend the rectangular tube in the E and H directions, effectively solving the problems of increased weight of the pipe clamps, increased number of pipe ends, and decreased waveguide performance that exist when using pipe clamps to connect tube bodies (with different bends). This allows the waveguide to smoothly bypass obstacles within the system, avoiding physical conflicts and preventing losses from excessive reflection and scattering of electromagnetic waves. The integrated tube structure can prevent electromagnetic wave energy leakage and ensure the stability of electromagnetic wave transmission.

The utility model discloses a cabinet type air conditioner, cabinet type air conditioner includes casing, evaporimeter and compression piece, and evaporimeter includes body and pipeline, and the body is installed in the casing, and the pipeline is connected with the body, and the compression piece is connected with the casing, and the compression piece and the casing surround the forming limiting cavity, or, the compression piece surrounds the forming limiting cavity, and the pipeline penetrates the limiting cavity. The cabinet type air conditioner provided by the utility model has the advantages of good limiting effect of the pipeline of evaporimeter and low failure rate.

The utility model relates to the technical field of breeding equipment, in particular to an excess material weighing assembly which comprises a weighing support, a guide supporting piece, a pressure sensor and a trough. The guide supporting piece is arranged on one side of the weighing support, the pressure sensor is arranged between the weighing support and the guide supporting piece, and one end of the trough is connected with the guide supporting piece. The excess material weighing assembly provided by the utility model comprises the weighing support, the guide support member, the pressure sensor and the trough, the guide support member is arranged on one side of the weighing support, and the pressure sensor is arranged between the weighing support and the guide support member. The weight of the feed trough is transmitted to the pressure sensor through the guide supporting piece arranged on one side of the weighing support, the pressure sensor can be prevented from occupying the space of the raw material trough in the depth direction, and the detection precision of the feed intake of the breeding hens is improved.

The utility model provides a ceiling machine panel and a ceiling machine. The ceiling machine panel comprises a panel main body and a lifting hook mounting part arranged on the panel main body. The lifting hook installation part comprises a lifting hook containing groove and a guide limiting plate used for guiding installation of the lifting hook assembly. The panel body is provided with an operation space. The guide limiting plate extends from the side edge of the lifting hook containing groove. In the guiding direction of the guiding limiting plate, the lifting hook containing groove is communicated with the operation space. Through the arrangement, the size of the lifting hook mounting part can be reduced, and the operation space is prevented from being occupied; meanwhile, the hook accommodating groove is communicated with the working space, so that the hook mounting part is more convenient to assemble parts, and the working efficiency is improved.

The utility model discloses a built-in buffer hinge which comprises a hinge base and a hinge arm, the hinge base and the hinge arm are hinged through a first connecting rod and a second connecting rod, a mounting seat is mounted in the hinge base, a sliding channel is arranged between the mounting seat and the inner bottom surface of the hinge base, a transmission member is slidingly mounted in the sliding channel, the upper end of the transmission member is provided with a driving plate which extends upwards and is arranged to extend through the mounting seat to the cup opening direction of the hinge base, a driving groove is formed in the first connecting rod, when the hinge is closed to a set angle, the driving plate extends into the driving groove and is pressed against the edge of the driving groove, thereby pushing the driving plate to slide in the sliding channel, a damper is further arranged between the transmission member and the hinge base, the damper slows down the movement speed of the transmission member and generates a buffer force when the hinge is closed.

The utility model relates to tunnel drainage technical field, concretely relates to a tunnel reverse slope drainage system, including the water collecting pit, the water collecting pit is used for collecting the water of tunnel inside, mobile water tank, mobile water tank is adjustable along the position of tunnel main hole axis direction, pump station, at least two pump stations interval settings are in tunnel slope well, and the pump station includes water collecting bin and equipment platform, and the equipment platform sets up in water collecting bin top, between water collecting pit and mobile water tank, between mobile water tank and the water collecting bin closest to tunnel main hole and between adjacent two water collecting bins all are communicated through water delivery pipeline, and the water collecting bin closest to tunnel slope well mouth is connected with the drainage pipeline, in water collecting pit, in mobile water tank and on equipment platform all are provided with water pump, the utility model can overcome the technical problem that the existing tunnel reverse slope drainage system can occupy the large amount of space inside tunnel main hole, leads to the space utilization rate reduction of tunnel main hole, and can hinder the tunnel main hole construction.

The utility model discloses a rotor, motor and compressor relates to motor technical field, the rotor includes rotor core and permanent magnet, the rotor core includes iron core body, the iron core body includes at least one first punching sheet and a plurality of second punching sheets that are laminated along the axial direction, the first punching sheet and the second punching sheet are respectively provided with a magnetic steel groove, the groove wall of the magnetic steel groove of the first punching sheet is provided with a limiting convex part, the shortest distance between the limiting convex part and the groove wall opposite to the limiting convex part is L, and the width of the magnetic steel groove is W; the permanent magnets are arranged in the magnetic steel grooves, and the thickness of each permanent magnet is T, and L is larger than 0 and smaller than 5 * (W-T). According to the technical scheme provided by the utility model, the permanent magnets can be prevented from vibrating when the rotor rotates, so that the noise level of the motor and the compressor can be improved.

The invention provides a four-motor pure electric platform configuration and a vehicle. The structure of the four-motor pure electric platform configuration comprises a front motor suspension and a front auxiliary frame installed on the vehicle; the front double motors are installed on the front motor suspension, and the front double motors are arranged in a forward rotation mode; the rear motor suspension is mounted on a rear sub-frame of the vehicle; the rear dual motors are mounted on the rear motor suspension, and the rear dual motors are arranged in a backward rotation manner; the high-pressure system is integrally arranged in a groove of the floor spare tire cabin; and the thermal management system is integrally arranged at the side part of the front dual-motor. The four-motor pure electric platform configuration and the vehicle can solve the problem of how to improve the space utilization rate of the pure electric vehicle.

The utility model relates to the technical field of passenger cars, and provides a surrounding structure of a passenger car, which comprises a rear surrounding part, a side surrounding part, a surrounding door, a first cross beam, a second cross beam and a mounting plate, the rear enclosure and the side enclosure are connected to form a semi-enclosure structure for a driver seat, the other side of the rear enclosure is connected with a vehicle body, the other side of the side enclosure is rotatably connected with the enclosure door, and the other side of the enclosure door is provided with a lock catch structure locked with or unlocked from an instrument desk; the first cross beam and the second cross beam are located on the side, facing the driver seat, of the rear enclosure and arranged on the vehicle body in parallel with the rear enclosure at intervals, the horizontal height of the first cross beam is larger than that of the second cross beam, and the mounting plate is arranged between the first cross beam and the second cross beam to form a mounting space with the rear enclosure. Therefore, the electronic device can be installed on the installation plate and hidden and stored in the installation space, the space utilization rate is improved, it is ensured that the space of a cab is clean and attractive, the space of the cab is prevented from being occupied, and operation of a driver is facilitated.