103results about How to "Compact space" patented technology

The utility model relates to a treble and bass coaxial moving coil loudspeaker horn, which comprises a main body bracket, a front cover, a PCB (Printed Circuit Board), an outer ring horn and an inner ring horn, the main body bracket comprises a shell and an annular partition plate arranged in the shell; a first magnetic circuit cavity is formed between the annular partition plate and the shell; and a second magnetic circuit cavity is formed in the annular partition plate. The main body support is divided into the first magnetic circuit cavity and the second magnetic circuit cavity by arranging the annular partition plate, the outer ring loudspeaker is arranged in the first magnetic circuit cavity, the inner ring loudspeaker is arranged in the second magnetic circuit cavity, namely, the inner ring loudspeaker is arranged in the spare area in the center of the outer ring loudspeaker, and therefore coaxial arrangement of the tweeter and the woofer is achieved. Not only can segmented coverage of an audio frequency band be realized, but also the whole loudspeaker structure can be more compact, and the overall appearance size of the loudspeaker is greatly reduced.

A foldable pushing chain type lifting platform belongs to the technical field of pushing chains and lifting platforms and comprises a meshed pushing chain system, an X-axis limiting mechanism and a Y-axis limiting mechanism, one side of the bottom of the meshed pushing chain system is fixedly connected with a base, the meshed pushing chain system outputs pushing chains upwards in the Z-axis direction, and the X-axis limiting mechanism and the Y-axis limiting mechanism are fixedly connected with the base. The top end of the pushing chain is fixedly connected with a top table used for bearing a lifted object, an X-axis limiting mechanism is further connected between the top table and the base, and the side, away from the meshing type pushing chain system, of the X-axis limiting mechanism is connected with a Y-axis limiting mechanism. The X-axis limiting mechanism is of a folding arm structure which only rotates around the X axis and limits the pushing chain and the top table to move in the X-axis direction. According to the invention, the pushing chain is used as a driving part, and the device has the advantages of high speed, large bearing capacity, high precision, long maintenance period, multi-point control, good stability, low initial height, large stroke, small occupied space and strong environmental adaptability.

The invention relates to the technical field of extrusion molding, in particular to an extrusion molding device for ultra-high molecular weight polyethylene pipe production, which comprises an extrusion cylinder, double screws and heating rings, the heating rings are uniformly distributed on the outer wall of the extrusion cylinder, the double screws are rotatably mounted in the extrusion cylinder, and a motor connected with the double screws is further arranged at the tail end of the extrusion cylinder. By arranging the driving assembly and the scraping assembly, when waste attached to the double screws is increased and the pressure in the extrusion barrel is increased, the driving assembly moves due to the increase of the pressure, a gear on the driving assembly transmits power of a motor to a lead screw, and the lead screw rotates to drive the scraping assembly to move back and forth while the scraping assembly is driven to move back and forth. According to the double-screw extruder, the scraper on the double-screw extruder extends out of the scraping assembly, then waste adhered to the double screws is scraped, after the waste is scraped, the pressure in the extrusion cylinder is reduced, the plug rod is reset, the scraper retracts into the scraping assembly, and then it is guaranteed that the scraper does not interfere with follow-up materials.

The invention relates to the technical field of transportation equipment, in particular to an automatic stacking device which comprises a tray collecting and delivering module, a tray centering module, a grabbing module and a tray steering module. The tray collecting and delivering module is used for delivering the collected trays to a conveying line; the tray centering module is used for centering each tray sent by the tray collecting and sending module on a conveying line; the grabbing module is used for grabbing goods to the centered tray; the tray steering module is used for steering the transportation direction of a tray loaded with goods; and the turned tray is transported to the shaping table, and the shaping table is used for adjusting the placing position of the goods on the tray. The structural design of each process module is compact, the overall occupied area is small, operation is flexible, and the transportation efficiency is high.

The invention discloses a single-steel-wheel road roller extended-range hybrid power system and a control method thereof.The system comprises a VCU complete machine controller, a battery pack, and a PDU distribution box, an ECU controller, a battery high-voltage box, a DC converter, an execution device and a range extender which are in signal connection with the VCU complete machine controller. The transmission efficiency of whole vehicle operation is low, and the cruising ability is poor in a pure electric mode.

This invention discloses an integrated power device combining a low-tooth-difference reducer and a motor, comprising a motor, a housing, and an output shaft coaxially arranged, with the housing rotatably connected to the output shaft. The housing has a hollow cavity inside, into which the motor output shaft extends and is linked via a reduction mechanism. A camshaft is connected to one end of the motor output shaft near the output shaft. The reduction mechanism includes a needle roller bearing mounted on the camshaft, a drive gear mounted on the needle roller bearing, and a transmission assembly installed between the drive gear and the output shaft. The inner wall of the housing has an internal gear ring, with the drive gear meshing with the internal gear ring using low-tooth-difference gears. This invention improves transmission stability and efficiency by designing the motor output shaft and camshaft as an integrated unit, while also making the space more compact. The drive gear and output shaft are driven by transmission steel balls, allowing the output end to directly bear radial force. The structure is simplified, with fewer parts, easier control of part machining accuracy, and lower manufacturing costs.

The invention provides a straight pipe pressure balance expansion joint for space limitation, which comprises a working wave assembly, a first balance wave assembly, a second balance wave assembly and a pull rod assembly, one end of the working wave assembly is connected with an inlet pipe, the other end of the working wave assembly is connected with one end of the first balance wave assembly through an outlet pipe, and the other end of the second balance wave assembly is connected with the pull rod assembly. The other end of the first balance wave assembly is connected with the pull rod assembly, the second balance wave assembly is sleeved with the first balance wave assembly, one end of the second balance wave assembly is connected with the outlet pipe, the other end of the second balance wave assembly is connected with the third connecting pipe, and one end of the pull rod assembly is connected to the inlet pipe. The other end of the pull rod assembly is connected to the third connecting pipe, a through hole is formed in the outlet pipe, and the through hole enables a working medium to enter a cavity formed by the first balance wave assembly and the second balance wave assembly. According to the expansion joint, large axial displacement and transverse displacement can be compensated, and the structure is more compact.

The present invention provides a flat-plate SAR satellite with a standardized satellite platform, including a satellite platform, a solar array and a phased array antenna. In the launch state, the solar array and the phased array antenna are folded into a structure with the same size as the satellite platform. In the on-orbit state, the phased array antenna is unfolded and parallel to the unfolded solar array. The present invention adopts a flat-plate configuration, the internal space of the platform is compact, the outer envelope shape of the whole satellite is regular, and the size distribution of each dimension is reasonable, which is convenient for one-shot multi-satellite layout, and can adapt to the internal space of most carrier fairings on the market to achieve rapid constellation networking; in the later stage, the satellite platform does not need to be replaced for SAR payloads of different sizes, thereby shortening the development cycle and reducing the development cost; the mechanical interface of the present invention is simple, the size of the satellite platform is minimized to be affected by the load change, and the AIT cycle of the whole satellite is effectively shortened; the thruster of the present invention is installed on the satellite platform through an adjustable bracket, and it is convenient to meet the thruster installation requirements through rough and fine position adjustment in the later stage.

The invention provides a reusable acoustic bag and an air suspension system, the acoustic bag comprises a shell and a locking mechanism, a plug pin is axially limited and mounted on a connecting part, and the plug pin is respectively connected with the corresponding shells on the inner side and the outer side of the connecting part, so that an upper shell and a lower shell are connected through the plug pin and form a sealed mounting cavity. Wherein the plug pin is axially mounted on the connecting part of the upper shell and the lower shell in a limiting manner, and the plug pin is not directly and fixedly connected with the shell. The connection relation between the upper shell body and the lower shell body disappears along with dismounting of the plug pin of the locking mechanism. Therefore, according to the reusable acoustic bag disclosed by the invention, the upper shell and the lower shell are connected through the bolts, the acoustic bag can be opened only by dismounting the bolts from the corresponding shells on the inner side and the outer side of the connecting part when a dismounting requirement exists, and the upper shell and the lower shell can be continuously reused without being damaged; repeated utilization of the acoustic bag is realized, and the use cost of the acoustic bag is greatly reduced.

The utility model discloses a small volume's PCB board heat radiation structure, including base material, the base material is opened with the installation site for installing bridge pile and MOS pipe, the base material avoids the position of installation site and is provided with a plurality of convex bridge heat dissipation tooth, the base material still is provided with the pin part, the pin part is used for with PCB board electricity is connected, through adopting inverted "L" character shape base material and utilize sheet metal bending and stamping process setting convex bridge heat dissipation tooth, effectively solved new energy charging equipment in aluminium sheet metal spare heat dissipation area is insufficient and aluminium profile spare structure flexibility problem, under the premise of not increasing heat radiation structure height or length makes heat dissipation area to improve 50% or more, significantly enhanced the convection and radiation heat dissipation capacity, satisfy bridge pile and MOS pipe etc. high heat component's high -efficient heat dissipation demand, keep small volume design to adapt compact space simultaneously.

The invention belongs to the technical field of environment monitoring, and particularly relates to a condensable particulate matter generating system. The system is composed of a gas source unit, a flow control unit, a humidification module, an aerosol generation unit, a mixing unit, a heating decomposition unit, a heat preservation unit, an absorption calibration module and a CPM sampling system which are connected in sequence. The gas source unit is a nitrogen source, the flow control unit realizes accurate regulation and control of carrier gas flow, the humidification module supports multiple humidification modes such as a humidifier or an aeration bottle to adapt to different humidity requirements, and the aerosol generation unit can switch generation modes such as a Bernoulli principle mode and an ultrasonic wave mode. The mixing unit realizes in-situ uniform mixing of aerosol through a conductive black carbon tube, the thermal decomposition unit completes decomposition of the aerosol through a tubular furnace, the thermal insulation unit prevents a gaseous precursor from being condensed in advance during transmission, and the absorption calibration module verifies and calibrates the CPM generation concentration. The system can stably generate CPM with specific components, and is low in cost, high in efficiency, flexible, environment-friendly and safe.

Disclosed in the present invention is a wafer polishing system, at least comprising a polishing unit, which comprises a fixed working station and two polishing modules, wherein the polishing modules are located on two sides of the fixed working station; each polishing module comprises a polishing platform and a polishing arm, which can drive a wafer to move relative to the polishing platform, so as to implement a polishing process; the polishing arms of the polishing modules on the two sides are located in a diagonal direction of the fixed working station; and the polishing arms can respectively swing between the fixed working station and the polishing platforms to transfer the wafer, and movement regions of the polishing arms having an overlapping portion. By means of the present invention, the polishing arm of each polishing module is independently controlled, so as to achieve better stability and flexibility; and only one fixed working station is needed to achieve the cooperation of multiple polishing modules to implement the polishing process of single or multiple wafers, so that the movement path in the polishing process is greatly shortened, which minimizes the time of the transfer process and improves the polishing efficiency.

The utility model relates to the technical field of hydraulic systems of engineering trucks, in particular to an emergency steering system of a mining dump truck, which comprises an oil tank, a steering mechanism, a main oil supply pipeline, an oil return pipeline, a steering gear, an emergency oil supply system and a shuttle valve, the steering mechanism comprises a steering oil cylinder, and a first cavity and a second cavity of the steering oil cylinder are respectively connected with a working oil way; a hydraulic main pump is arranged on the main oil supply pipeline and connected with a driving mechanism, and the steering gear is connected with the steering oil cylinder and used for achieving vehicle steering. The emergency oil supply system comprises at least two emergency oil supply pipelines connected with the main oil supply pipeline in parallel, and each emergency oil supply pipeline is provided with an emergency motor pump set and a one-way valve. And the shuttle valve is arranged at the junction of the emergency oil supply pipeline and the main oil supply pipeline. According to the utility model, an emergency steering scheme of the double-motor pump set is adopted, so that the cost is lower than that of a conventional scheme using an energy accumulator, and the spatial arrangement is compact.

A magnetic sensor device (1) having a wiring substrate (2), a plurality of magnetic detection elements (4) mounted on the wiring substrate (2), and a rectangular integrated circuit (3) electrically connected to the plurality of magnetic detection elements (4), the plurality of magnetic detection elements (4) being disposed outside the integrated circuit (3) when viewed from the normal direction of the wiring substrate (2), and the plurality of magnetic detection elements (4) being disposed outside the integrated circuit (3) when viewed from the normal direction of the wiring substrate (2). Magnetic detection elements (4), the magnetic induction directions of which are parallel to each other, are disposed at least at positions along two sides (31a), (31b), (31c), (31d) facing each other in an integrated circuit (3).

This utility model provides a filtration device for a laminator, relating to the field of laminator filtration technology. It aims to solve the problems of poor filtration efficiency in existing vacuum pumps that use conventional paper filter elements to filter the gas generated during vacuuming. This allows impurities such as welding slag and iron filings to penetrate the filter element and enter the vacuum pump cavity, affecting normal operation. Furthermore, the accumulation of impurities and dust necessitates frequent inspection, maintenance, and upkeep of the vacuum pump and filter, increasing maintenance costs. The proposed device includes a vacuum pump system with a laminator vacuum valve installed on its left side. A filter tank system is installed between the vacuum pump system and the laminator vacuum valve. The tank serves as a pre-vacuum tank to pre-vacuum the cavity. A bypass design is used; after pre-vacuuming, the filter tank's function is disabled, and the pump directly evacuates the cavity, reducing pump load, effectively improving equipment evacuation efficiency, reducing vacuum pump filter consumption, and minimizing pump maintenance.

The invention relates to the technical field of intelligent monitoring equipment, in particular to building energy consumption monitoring equipment with a protection function, which comprises a box body and an energy consumption monitor main body, the box body is vertically distributed and can be moved to a preset position to complete position fixation; heat dissipation holes are further formed in the rear side of the inner cavity of the box body, a temperature detection sensor is further arranged on one side in the box body, and a fan is arranged at the ventilation opening; the inner cavity of the box body is also provided with a protection structure; the protection structure comprises a fire detection probe, a mounting seat and a fire extinguishing bottle; the energy consumption monitor main body is connected with a cloud terminal; wherein the energy consumption monitor main body comprises an information acquisition module, an information regulation module, an information management module, an information regulation and control module, a data transmission module, a data storage module and an energy control protection module. The system is reasonable in structural design, the safety protection is upgraded, the building energy consumption can be dynamically monitored, analyzed, regulated and controlled, the refined management and control of the building energy consumption are realized, and new value experience is brought to users.

The application discloses a kind of based on inflation plate's spray type liquid cooling battery energy storage cabinet and control method, including energy storage cabinet cabinet and heat management module, the battery pack containing electric core is placed in the energy storage cabinet cabinet inside, spray cooling module, fire-fighting module, control module and energy storage converter module;It also discloses a kind of control method simultaneously, so that electric core works at optimum temperature, guarantees electric core safety, prolongs electric core life;Adopt spray liquid cooling mode, contact thermal resistance is lower, surface temperature uniformity is better;Each module is using module integration design, space structure is compact, installation mode is simple, flexibility is high, adapts to different size energy storage battery pack.

This application provides a radially inlet anti-icing bleed air collecting ring structure, belonging to the field of aero-engine technology. It includes a collecting ring welding assembly, an inlet casing, and an inlet support plate. The inlet support plate is welded to the inlet casing. The collecting ring welding assembly includes a collecting ring, an inlet pipe, and a collecting ring cover plate. The collecting ring cover plate and the collecting ring form an annular collecting cavity. The inner wall of the collecting ring is fitted onto the outer side of the inlet casing assembly. A radial ventilation hole is provided on the inner wall of the collecting ring. An anti-icing bleed air inlet hole is provided on the inlet support plate. The radial ventilation hole and the anti-icing bleed air inlet hole are connected by a bleed pin. The inner cavity of the inlet support plate communicates with the collecting cavity through the through hole of the bleed pin. A bleed pin mounting hole is provided on the outer wall of the collecting ring, and this hole is sealed by a plug. One end of the inlet pipe is connected to the outer wall of the collecting ring and communicates with the collecting cavity, while the other end is connected to the anti-icing bleed air circular pipe. This application achieves a compact and detachable design, reducing pressure and temperature losses during the flow of anti-icing bleed air.

The utility model relates to the technical field of water conservancy projects, in particular to a water-saving pool structure for a water-saving ship lock, which comprises a bottom lining, a side slope lining and a lock wall, the bottom lining is arranged at the bottom of a water-saving pool, the side slope lining is arranged on a mountain side slope, and the lock wall is oppositely arranged on the other side of the side slope lining. The two sides of the bottom face lining are connected with the side slope lining and the lock wall correspondingly, and the side slope lining and the lock wall are used for forming the side walls of the water saving pool. The slope lining and the lock wall are used as the pool wall structure of the water-saving pool, the mountain does not need to be deeply excavated to form the water-saving pool in the mountain during construction, the construction work amount of mountain excavation is reduced to a great extent, the construction efficiency is effectively improved, the construction cost is reduced, the topographic conditions of the mountain canyon are utilized, and the construction cost is reduced. The water-saving pool and the lock chamber structure are arranged in the limited space in the canyon in a unified and centralized mode, the occupied area of the water-saving pool and the ship lock is saved, space utilization is more reasonable, and the whole structure of the water-saving ship lock is more compact.

The invention relates to the technical field of mining high-voltage explosion prevention, in particular to a mining safety type solid insulation high-voltage explosion-proof device which comprises a high-voltage cabinet and an electrified body, epoxy resin plates are fixedly connected to the front face of the high-voltage cabinet, a plurality of epoxy resin plates form an insulation cavity, the electrified body is located in the insulation cavity, and a partition plate is fixedly installed on the inner wall of the high-voltage cabinet. A reaction box is fixedly mounted on the left side of the partition plate, and a liquid box, a reaction mechanism, a collection mechanism and a turbulent flow mechanism are arranged in the reaction box. The mining safety type solid insulation high-voltage explosion-proof device is simple in mechanism, convenient to install, small and exquisite in cabinet body, compact in space and provided with an independent insulating chamber of an electrified body, the safety performance is improved, maintenance is convenient when a fault occurs, recovery can be achieved by replacing a circuit breaker, maintenance-free can be really achieved, the top plate is disassembled during disassembly, and the explosion-proof effect is achieved. The electrified body can be detached along the guide rail by pulling the electrified body upwards, maintenance is convenient when a fault occurs, recovery can be achieved by replacing a circuit breaker, and the maintenance-free effect can be really achieved.

The utility model discloses a handle module of a shelf and a dish-washing machine, and the handle module comprises a handle body which is provided with a first handle piece and a second handle piece which are assembled; the decoration strip is made of a soft material and is positioned between the first handle piece and the second handle piece; the upper part of the handle body is provided with a mounting opening which is used for mounting the decoration strip and is positioned between the first handle piece and the second handle piece, the decoration strip is provided with a decoration part positioned in the mounting opening, and a mounting part which is bent and extends towards the direction of the first handle piece and / or the second handle piece is arranged along the inner end of the decoration part. According to the shelf handle, the decoration strip made of the soft material is arranged on the upper portion between the first handle part and the second handle part, so that an original gap is effectively filled, the overall appearance of the shelf handle is more exquisite, and the visual quality feeling of the shelf handle is improved. The installation part is arranged and can be better matched with the first handle part and the second handle part, the overall structural stability of the handle is enhanced to a certain degree, and the handle is more reliable in the using process.

This invention discloses an in-situ mixed-flow sampling device and an electrolytic water system. The in-situ mixed-flow sampling device includes a mixed-flow sampling mechanism and an analysis mechanism. The mixed-flow sampling mechanism includes at least one inlet, at least one outlet, and at least one sampling port. A turbulence structure is formed inside the mixed-flow sampling mechanism to drive fluid turbulence. A gas chamber for gas phase enrichment is formed at the top of the turbulence structure. A gas guide tube is provided inside the mixed-flow sampling mechanism, with one end extending into the gas chamber and the other end connected to the sampling port. The gas chamber and the inner cavity of the gas guide tube together form a micro-cavity with a volume ≤20mL. An analysis mechanism is provided at the sampling port and is configured for selective permeation. The beneficial effects of this invention are: while ensuring good sampling accuracy, it can also drastically reduce the overall device size, making it suitable for oxygen-hydrogen sampling scenarios in low-power electrolytic water systems with a hydrogen production rate ≤5Nm³ / h.

This utility model relates to a water pump assembly structure, including a water-cooled engine, a coolant tank, an electronic water pump, a first coolant pipe, a second coolant pipe, a third coolant pipe, and an electronic control unit. The water-cooled engine is mounted on a vehicle frame and includes a cylinder head, a cylinder, and a water jacket. The cylinder head connects to the cylinder, and the water jacket is housed within the cylinder head and cylinder, including a water jacket inlet and a water jacket outlet. The coolant tank includes a tank inlet, a tank outlet, and a cooler body. The electronic water pump includes a pump inlet, a pump outlet, and a pump body. The two ends of the first coolant pipe are connected to the water jacket outlet and the tank inlet, respectively; the two ends of the second coolant pipe are connected to the tank outlet and the pump inlet, respectively; and the two ends of the third coolant pipe are connected to the pump outlet and the water jacket inlet, respectively. The electronic control unit is electrically connected to the electronic water pump. Therefore, this utility model replaces the mechanical water pump and thermostat of the existing water-cooled engine with an electronic water pump, which automatically controls the water flow rate of the water-cooling system. The speed of the electronic water pump is also adjusted according to the different heat loads of the water-cooled engine, which will avoid the loss of local power of the water-cooled engine and achieve energy saving of the water-cooled engine.

The invention discloses an unmanned aerial vehicle self-locking switch system and a control method thereof, and relates to the technical field of unmanned aerial vehicles. The system comprises a switch button, an auxiliary power module, a main power module, a self-locking unit, a control unit and an electric quantity display unit, stable startup and shutdown are achieved through dual-time-sequence button control that first pressing lasts for a first preset time and second pressing lasts for a second preset time in cooperation with a time-sharing cooperation mechanism of auxiliary power and main power, the self-locking unit locks the switch state, and the electric quantity display unit displays the electric quantity. And accidental on-off caused by signal jitter is avoided. The system is extremely low in leakage current in a shutdown state, effectively prevents battery over-discharge, has electric quantity display and state feedback functions, and remarkably improves the reliability, safety and user experience of the switch.

This utility model belongs to the technical field of foldable and expandable armrest seating, specifically a foldable and expandable armrest seating system. It includes a sofa seat body with foldable armrest fabric fixedly installed on both sides. When space is limited and movement is inconvenient, the foldable armrests can be folded using a control zipper. Pulling the zipper opens the foldable armrest fabric. A user can then operate the control handles by pressing them with one hand, causing the handles to lower a sliding rod. The sliding rod moves a slider and several connecting rockers above it. These rockers move a folding and expanding swing arm around a rotating groove above a guide frame, allowing the swing arm to move a push plate. The push plate then pushes the expanding side panel, allowing the foldable armrest fabric to expand or contract.

This utility model belongs to the field of sock knitting technology, and specifically relates to a sock-feeding assembly and a sock-feeding device using the same, which solves the problem of inconvenient disassembly and assembly of the sock-feeding tube and the lifting seat. The sock-feeding device of this application includes a main shell, within which the sock-feeding assembly is housed. The lifting seat is connected to a screw-nut lifting unit. A main guide rod and a secondary guide rod are provided between the screw-nut lifting unit and the sock-feeding tube. The lifting seat has an axially penetrating guide hole and a side-open guide groove. The main guide rod is slidably connected to the guide hole, and the secondary guide rod is slidably connected to the guide groove. The sock-feeding assembly includes a lifting seat, and the sock-feeding tube is radially limited and connected to the lifting seat. At least one limiting groove is provided on the sock-feeding tube. The lifting seat has a locking body that cooperates with the limiting groove. The locking body can extend into the limiting groove to prevent axial movement of the sock-feeding tube. A locking body movable positioning mechanism is provided between the locking body and the lifting seat. This achieves the effect of quick disassembly and assembly of the sock-feeding tube and the lifting seat.

The present invention discloses a symmetrical air duct of a sludge drying machine with a heat pipe, including an equipment housing, two symmetrical groups of air duct bodies are arranged inside the equipment housing, and the outlets of the two groups of air duct bodies are gathered at the air outlet of the equipment housing, a return air duct is arranged above the inlet end of the air duct body, and the air duct body is sequentially provided with a water meter cooler and a vertically placed evaporator from the inlet end to the outlet end. The air duct body of the device has a simple structure and fewer turns, which reduces the resistance to the internal circulating air, thereby improving the circulation effect of the air duct, and at the same time enables the fan to operate with less power, reducing costs. A primary filter, a medium-efficiency filter, and a high-efficiency filter are arranged inside the return air duct, and dust in the air can be filtered and removed through each filter. At the same time, since each return air duct is modularly arranged, it is convenient to inspect and clean the internal filter.

An automatic pallet changer (10) includes a first arm member (51A) and a second arm member (51B) that are turnable about a first axis (210) extending in an up-down direction and move reversely to each other to a first side and a second side across a predetermined plane (200) including first axis (210) in association with turning about the first axis. Each arm member (51) of first arm member (51A) and second arm member (51B) is pivotable about a second axis (220) extending in a horizontal direction and included in predetermined plane (200).

The invention relates to the technical field of pipeline cutting, in particular to cutting equipment for polyurethane thermal insulation pipe machining, which comprises a base, a supporting mechanism, a cutting mechanism and an adjusting mechanism, the supporting mechanism comprises a supporting roller, a supporting frame and a driving part; the driving part is used for driving the front and rear supporting rollers to get away from and get close to each other; the cutting mechanism comprises a fixing plate, a cross beam, a first air cylinder, a mounting seat, a cutting motor and a cutter; the adjusting mechanism comprises a positioning plate, a moving part and a clamping part; the moving part is used for driving the positioning plate to move left and right relative to the base; the clamping piece is used for clamping the end of the polyurethane thermal insulation pipe and driving the polyurethane thermal insulation pipe to rotate synchronously when the cutter works. The structural design is optimized on the basis of automatic leveling, the stability and adaptability of pipeline supporting and conveying are improved, meanwhile, uniform cutting of large-specification pipelines with different length requirements is achieved through a simple structure, automatic collection of the cut pipelines is achieved, and practicability is higher.

The utility model discloses a zoom projection lens which comprises a first lens assembly, a second lens assembly, a third lens assembly, a diaphragm, a fourth lens assembly and a fifth lens assembly which are sequentially arranged along a direction from an object space to an image space. A full-group linkage zoom design is adopted, and the first lens assembly is set as a zoom group for changing the focal length of the projection lens; the second lens assembly, the third lens assembly, the fourth lens assembly and the fifth lens assembly are arranged to be a compensation group used for offsetting the image surface position change caused by the movement of the zoom group. When zooming is carried out from the telephoto end to the wide-angle end, the distance between the second lens assembly and the third lens assembly is gradually increased. According to the utility model, the space occupied by the lens is reduced, so that the lens can adapt to the working condition of a compact installation space, the lens can maintain excellent imaging performance at different focal lengths within the working temperature range of a special application scene, and the flexible adaptability of the zoom projection lens is improved. The utility model also provides a projection system.