50results about How to "Reduce rebound" patented technology

The invention provides a negative electrode binder, a negative plate and a secondary battery in order to solve the problems of low peeling strength and low cycle life of a coating of an existing negative electrode binder. The negative electrode binder comprises a copolymer, and the copolymer comprises an acrylate unit, a vinyl aromatic unit, an acrylamide unit, an acrylate-polyol unit and a crosslinking unit. According to the negative electrode binder provided by the invention, the negative electrode active material layer has relatively high binding power, low pole piece rebound and relatively small full-charge rebound, so that the long cycle life of the battery is ensured.

The invention relates to the field of batteries, and discloses electrode slurry, a preparation method thereof, an electrode plate, a battery and an electric device. The electrode slurry comprises an electrode active material, a conductive agent, a binder, a plasticizer and a solvent, the binder comprises CMC (Carboxymethyl Cellulose), SBR (Styrene Butadiene Rubber) and a water-based binder, the water-based binder is an acrylic copolymer binder, and the SBR is a styrene, butadiene and acrylonitrile copolymer binder. The CMC, the SBR and the specific water-based copolymer binder are combined and applied to the electrode slurry, through matching with other components such as an active material and the like, the processing performance of the electrode slurry can be remarkably improved, for example, smooth sieving of the slurry, improvement of binding power, reduction of pole piece rebound and the like can be achieved, and meanwhile compared with slurry adopting a commercial binder, the service life of the electrode slurry is prolonged, and the service life of the electrode slurry is prolonged. And the long cycle performance of the battery can be improved, and the requirement of a high-performance battery can be further met.

The utility model relates to pipeline detection technical field discloses a natural gas long -distance pipeline safety pressure testing device, including pressure testing detection box and water delivery pipe, the outside right side fixed connection of pressure testing detection box has the gas straight pipe, the inside fixed connection of gas straight pipe has sealing ring no.

The invention relates to the technical field of winding machines, in particular to a full-automatic winding machine capable of preventing wire breakage, which comprises a winding machine body and a bottom plate, the bottom plate is mounted at the end part of the winding machine body, a movable seat and a fixed seat are arranged at the end part of the bottom plate, a mold fixing cylinder is arranged in the movable seat, an outer sleeve is arranged in the fixed seat, and a wire inlet cylinder is inserted into the side wall of the fixed seat; a conveying wheel is arranged in the outer sleeve, and a first moving plate is arranged on the side wall of the fixing base. By arranging the tension detection sensor, the tension condition of the wire rod in the winding process is monitored, when the tension exceeds a preset safety range, the tension detection sensor can rapidly transmit a signal to the first servo motor, the first servo motor is started and adjusts the positions of the rotating ring and the adjusting ring, the conveying path and the tension state of the wire rod are changed, and the wire rod is conveyed. The problem of wire breakage caused by too high tension is reduced and avoided, the stability and reliability of wire winding are improved, production interruption and waste products caused by wire breakage are reduced, and the production efficiency is improved.

The utility model relates to a kind of rock breaking rods, it includes: including main body and hammer head, main body is covered with flexible layer outside, main body is equipped with movable cavity inside, movable cavity is arranged close to the bottom end of main body, several movable members are filled in movable cavity, and movable member can freely move in movable cavity. Hammer head is located below main body, and is connected with the bottom end of main body. Inertial motion of movable member can absorb and offset part of kinetic energy that bounces back to rock breaking rod, so as to significantly reduce rock breaking rod echo, improve rock breaking effect. Movable member shakes in movable cavity can significantly reduce the vibration of rock breaking rod and the intensity of high-frequency noise radiated outward, so as to be conducive to ecological environmental protection. Flexible layer covered outside main body buffers the vibration of main body, and reduces the noise propagated outward by main body. Therefore, the rock breaking rod can reduce the adverse effects of energy bouncing back to rock breaking rod.

The invention provides a correction jig, a correction method, a rotating shaft cover plate and foldable electronic equipment. The correction jig is used for correcting the straightness of a long-strip-shaped part and is provided with a first groove, and the first groove extends in the first direction; in the second direction, the range of the difference value w1-w1'between the width w1 of the first groove and the width w1 'of the long-strip-shaped part is larger than or equal to 0.05 mm and smaller than or equal to 0.1 mm, and the first direction intersects with the second direction. The correction jig is simple in structure.

The invention discloses a damping device for an industrial pipe gallery, and particularly relates to the technical field of pipe gallery damping, the damping device comprises a pipe gallery main body, a damping part and an energy storage part, the damping part comprises a plurality of damping blocks, and a first buffer cavity and a second buffer cavity are formed in each damping block; the damping block buffers vibration generated by the pipe gallery body through flowing of liquid in the first buffering cavity and the second buffering cavity, and excessive springback is prevented during buffering recovery. The energy storage part comprises energy storage pieces arranged at the two ends of the damping block correspondingly and an energy storage cavity formed in the side face of the damping block, and when the damping block buffers vibration, the energy storage pieces compress gas and transmit the gas to the energy storage cavity; liquid flows in the first buffering cavity and the second buffering cavity, so that damping force opposite to the vibration direction and the rebound direction of the fourth elastic piece is generated, vibration is rapidly buffered, meanwhile, the rebound amplitude of the fourth elastic piece is gradually reduced, and redundant vibration caused by excessive rebound of the fourth elastic piece is reduced; and the damping effect is improved.

The invention discloses an anti-scale sewage solid-liquid separation reaction device, and relates to the technical field of sewage treatment. The device comprises an accommodating shell, a first filter plate is mounted in the accommodating shell, the accommodating shell is divided into a filter chamber and a reaction chamber from top to bottom by the first filter plate, and the first filter plate is conical. During use, sewage is discharged into the filtering chamber through a water outlet of the water inlet pipe, filtering is performed through a second filtering plate and a first filtering plate, and during use, a sliding block on the second filtering plate is driven to slide in a spiral groove through rotation of the water inlet pipe; through guiding of a spiral groove and a vertical groove, a second filter plate reciprocates in the filter chamber, one is used for shaking dirt on the second filter plate, and the other is used for extruding dirt between the first filter plate and the second filter plate, so that sewage can better fall into the reaction chamber to react with a flocculating agent; and the practicability of the device is improved.

The invention discloses a damaged carton recycling device and method for carton packaging, and relates to the technical field of waste recycling, the damaged carton recycling device comprises a shell, two door bodies rotationally installed on the shell, a control module fixedly installed outside the shell and a data display module, the compaction assembly is mounted in the shell; the hydraulic rod is fixedly mounted at the top of the shell; and the compaction assembly comprises a bottom plate fixedly mounted at the bottom of the shell and an extrusion plate slidably mounted in the shell, a connecting sleeve is fixedly mounted on the extrusion plate, and the driving end of the hydraulic rod is fixedly connected with the connecting sleeve. The carton compacting device has the advantages that in the carton compacting process, through pressure equalizing and buffering of the pressure buffering assembly, negative pressure air exhaust gap discharging and resistance reducing, lateral protection restraining deformation and repeated tamping successive exhaust plastic deformation, the interlayer fitting degree and uniformity of paperboards can be synergistically improved, and the higher compression ratio and the lower rebound rate are achieved.

The embodiment of the present application relates to the field of precision machining technology, and discloses a high-precision aluminum alloy stamping process and die design method, which comprises the following steps: predicting material data of aluminum alloy to be processed according to experimental data of the aluminum alloy; the material data comprises material flow, springback and stress distribution data; simulating and predicting a die surface for compensating springback according to the material data of the aluminum alloy to be processed, so as to manufacture a stamping die; determining the spraying thickness of a lubricant according to the composition of the lubricant, the inner surface structure of the stamping die and the material data of the aluminum alloy to be processed; spraying the lubricant on the surface of the aluminum alloy to be processed according to the spraying thickness; step-by-step stamping the aluminum alloy to be processed; springback calibration is performed on the stamped aluminum alloy, so as to obtain calibrated aluminum alloy; after trimming the calibrated aluminum alloy, a formed aluminum alloy is obtained. The embodiment of the present application effectively reduces the springback problem in the machining process and reduces the trial and error cost.

The invention provides 450MPa-grade hot-dip galvanized low-density steel with low yield ratio and high corrosion resistance and a manufacturing method thereof. A steel plate comprises the following components in percentage by weight: 0.04%-0.06% of C, 0.25%-0.4% of Si, 1.4%-1.5% of Mn, 3.3%-6.5% of Al, less than or equal to 0.010% of P, 0.01%-0.03% of S, 0.01%-0.015% of RE and the balance of Fe and inevitable impurities. The manufacturing method of the steel comprises the steps of blast furnace molten iron pretreatment, converter steelmaking, continuous casting, hot continuous rolling, acid pickling, cold rolling and hot galvanizing. The steel structure is delta-ferrite, alpha-ferrite, martensite, retained austenite and sulfide, the content of the martensite is 3.5-5%, the sulfide is composed of a small amount of MnS and RE-S-O which are distributed in a dispersed mode, the small amount of MnS is separated out in the ferrite and the martensite in a dispersed mode, and the RE-S-O is distributed along the ferrite grain boundary.

The invention discloses application of a nutritional composition containing alpha-hydroxyisocaproic acid in weight management and blood fat improvement, and belongs to the fields of biological medicine manufacturing, biological medicine application and functional food development. The nutritional composition comprises alpha-hydroxyisocaproic acid and at least one second functional nutritional component, and the second functional nutritional component is preferably selected from one or more of the following components: 1) one or more of tea polyphenol and capsaicin; 2) one or more of beta-glucan, inulin and resistant dextrin; 3) one or more of medium chain triglyceride and sn-1, 3 diglyceride; under the condition of the same intake cycle and dosage, the nutritional composition can significantly improve the weight management effect and reduce related indexes of blood fat through a multi-way synergistic effect, and is combined with GLP-1 drugs or sequentially applied to weight management so as to reduce the risk of weight rise after drug withdrawal.

A vehicle body side wall double-door ring structure comprises a single-door ring sub-assembly and a C column sub-assembly, the single-door ring sub-assembly comprises an A column upper edge beam middle section, an A column upper edge beam lower section, an A column lower reinforcing plate, a threshold front reinforcing plate and a threshold rear reinforcing plate which are sequentially connected to form a first door ring, and the C column sub-assembly comprises a second door ring sub-assembly and a third door ring sub-assembly. The C-column sub-assembly comprises an A-column upper edge beam upper section and a C-column lower reinforcing plate, the A-column upper edge beam middle section, the A-column upper edge beam upper section, the C-column lower reinforcing plate and the threshold rear reinforcing plate are sequentially connected to form a second door ring, at least one of the connecting positions of all the part material pieces is in lap spot welding connection, and the rest part material pieces are in laser tailor welding connection. And the connected integrated material sheets are formed through hot stamping. According to the double-door-ring structure, laser tailor-welding and local lap joint are adopted at the same time, then integral hot stamping forming is conducted, on the basis of tailor-welding, a local overlapping lap joint spot welding area is increased, structural lap joint is optimized, a structural weak area is avoided, and local strength is improved without additional reinforcing pieces.

The application relates to a flattening device for carton production, which comprises a frame body, a conveyor for conveying carton boards arranged on the frame body, a plurality of guide rollers arranged along the length of the conveyor in sequence, a flattening mechanism arranged on the frame body and used for flattening the carton boards, characterized in that a heat source roller is arranged above the conveyor and used for hot pressing the carton boards, and a driving member is arranged on the frame body and used for driving the heat source roller to rotate. The flattening device can be used in cooperation with the heat source roller, the driving member and the flattening mechanism, the carton boards can be hot-pressed before being flattened, the carton boards are subjected to the joint action of heat and pressure, the flexibility of the carton boards is reduced, the resilience of the carton boards is weakened, the required pressure and time for subsequent flattening are reduced, the carton boards can reach the flatness requirement through one or a small number of flattening operations, and the production efficiency is improved.

The present disclosure provides a visual pressure regulating catheter, including: a catheter body (1), and a hydraulic dilation balloon (2) and a pressure regulating handle (3) both of which are disposed on the catheter body (1), an endoscope pressure regulating cavity (5) and a dilation liquid perfusion cavity (6) are formed in the catheter body (1), the dilation liquid perfusion cavity (6) is communicated with the hydraulic dilation balloon (2), and the pressure regulating handle (3) is provided with a perfusion port (301) which is communicated with the dilation fluid perfusion cavity (6) and a pressure regulating port (701) which is communicated with the endoscope pressure regulating cavity (5); an observation channel (4) is opened at a position on the endoscope pressure regulating cavity (5) axially opposite to the hydraulic dilation balloon (2), a camera at a front end of the endoscope sequentially passes through the pressure regulating port (701), the endoscope pressure regulating cavity (5) and the observation channel (4) and extends into the hydraulic dilation balloon (2), and an operating rod at a tail end of the endoscope is slidably and sealingly connected to the pressure regulating port (701).

This invention provides a skeleton oil seal for large interference fit. The outer periphery of its rubber layer has radially protruding first, second, and third stepped sections from top to bottom. The bottom end of the third stepped section has an auxiliary chamfer. The interference fit of the three stepped sections is different, with the second stepped section having the largest interference fit. This simplifies the interference fit installation of the skeleton oil seal and optimizes stress distribution, reducing the maximum shear force. The auxiliary chamfer helps reduce the interference fit during initial press fit, facilitating smooth alignment of the bottom end of the skeleton oil seal and its forward insertion into the bearing. Multiple annular protrusions are provided on the outer sides of the three stepped sections, forming a wavy, concave-convex structure. This reduces the rebound of the skeleton oil seal after assembly, ensuring it is in the correct assembly position. While maintaining sealing performance, this reduces rubber compression, thus preserving rubber elasticity and extending the service life of the skeleton oil seal.

The invention belongs to the technical field of plate electromagnetic forming, and discloses a plate magnetic high-speed stamping forming device which comprises a female die and a male die used in cooperation, and a plate to be machined is arranged between the female die and the male die; a guide bin and a supporting block are arranged on the outer side of the male die. The supporting block is located at the bottom of the guide bin. The driving plate is located at the bottom of the male die and connected with the male die; the insulating block is fixedly provided with an electromagnetic coil, and the electromagnetic coil is connected with the pulse current loop through a wire; the electromagnetic coil discharges to generate electromagnetic force to enable the driving plate to move upwards so as to drive the male die to impact a to-be-machined plate at a high speed, and plastic deformation occurs in the material thickness direction. The invention further provides a machining method for machining the plate through the device. The device and the method have the advantages of high forming efficiency and high forming precision.

A coil wire transposition tool belongs to the technical field of transformer production and comprises a wire, a fixing portion and an operating portion, the wire is respectively clamped between the fixing portion and the operating portion, and the fixing portion and the operating portion are connected with each other. The fixing part comprises a back plate and a front pressing plate, the front pressing plate is installed on the back plate, and the front pressing plate presses the wire on the back plate. The upper half portion of the back plate is an upper fixing plate, the lower half portion of the back plate is a rear fixing plate, a height difference exists between the upper fixing plate and the rear fixing plate to form a step, the middle of the upper fixing plate extends downwards to form a first hanging lug, the front pressing plate is installed on the first hanging lug, and a transverse guide hole is formed in the rear side of the top of the upper fixing plate and connected with the operation portion. The operation part comprises a first pressing plate, a second pressing plate, a guide plate and a follower plate, the first pressing plate is slidably mounted on the second pressing plate, the second pressing plate is slidably mounted on the guide plate, and the guide plate is slidably mounted on the follower plate.

The application discloses a kind of high density low rebound shotcrete and preparation method thereof, it is related to shotcrete field, and preparation method includes: (1), respectively to cementitious material, fine aggregate, coarse aggregate is using MAA model to be packed and the design ratio of each raw material in interior is obtained;(2), cementitious material, fine aggregate, coarse aggregate and the rebounding agent of design ratio obtained according to step (1) are fully mixed, water, water reducing agent is mixed, then by the way of mixing with pressurized air, incorporate accelerator, obtain high density low rebound shotcrete.The application uses early strength rebounding agent, improves the pumpability of shotcrete, accelerates the early hydration of concrete, under the joint action of alkali-free accelerator, rapidly improves the early mechanical properties of shotcrete, improves shotcrete construction efficiency.Multiple close packing is used, and cementitious material, fine aggregate, coarse aggregate respectively form close packing structure, effectively improve the plastic viscosity of paste and the compactness of concrete.

This utility model relates to the field of adhesive performance testing technology, and discloses an adhesive performance testing device, including a support plate and two positioning rods. The two positioning rods are respectively fixedly disposed between two support plates and located on both sides. A tension assembly is disposed at the lower end of the upper support plate, the tension assembly including a tension sensor and an upper adhesive plate, and a buffer protection mechanism is provided on the tension assembly. A pressure assembly is disposed at the upper end of the lower support plate, the pressure assembly including a lower adhesive plate, a screw, and a pressure spring, and a ball bearing mechanism is provided inside the pressure assembly. In this utility model, the device can reduce the rebound amplitude of the upper adhesive plate under the reaction force of the tension spring, thereby protecting the safety of surrounding personnel, and simultaneously reducing the large amount of physical exertion expended by the testing personnel when turning the handle, providing convenience for the testing personnel during operation.

The application discloses a shotcrete rebound-reducing agent and a preparation method thereof. The shotcrete rebound-reducing agent is prepared from the following raw materials in mass percentage: 15-30% of a quick-setting component, 2-5% of a viscosity-increasing component, 10-15% of a reinforcing component, 2-5% of an anti-freezing component, 1-4% of a stabilizer, and the rest of water; and the viscosity-increasing component is a combination of polyvinylpyrrolidone and modified carboxymethyl cellulose. The prepared shotcrete rebound-reducing agent has the advantages of good sprayability, high hourly strength, good anti-freezing and stability, and the like, can improve the working performance of shotcrete, reduce the content of a quick-setting agent and significantly reduce the rebound rate of shotcrete, and has good economic benefits.

The invention relates to the field of tail propeller configuration fixed wing flight devices, in particular to an arresting hook system and a flight device. The arresting hook system comprises an arresting hook arm assembly, a buffering assembly and a retracting and releasing assembly, the arresting hook arm assembly comprises a mounting support, a swing arm and a hook head which are sequentially connected, the swing arm is rotationally connected with the mounting support, and the hook head is used for hooking an arresting rope; the buffer assembly is arranged opposite to the mounting support and comprises a mounting plate and a buffer piece arranged on the mounting plate, and the buffer piece makes contact with the swing arm when the hook head makes contact with the ground and swings to a preset position; the winding and unwinding assembly comprises a driving assembly and a winding and unwinding cable, the driving assembly is arranged on the mounting support, one end of the winding and unwinding cable is connected with the driving assembly, the other end of the winding and unwinding cable is connected with the swing arm after winding around a supporting device on the mounting plate, and the driving assembly can drive the winding and unwinding cable to drive winding and unwinding of the hook head. By means of the structure, the purposes of rapid upward swinging of the hook head, impact buffering and protection of the retracting and releasing assembly are achieved.

The embodiment of the application provides an electric connector and electronic equipment, relates to the conductive technology field, and is used for solving the problem that the existing electric connector cannot simultaneously have multiple performances. The electric connector comprises an elastic bubble core and a conductive layer. The inside of the elastic bubble core comprises a plurality of bubble holes. The conductive layer is wrapped around the periphery of the elastic bubble core, and the conductive layer comprises at least one nanowire layer. The electric connector can simultaneously meet the comprehensive requirements of low impedance, low rebound force, low harmonic, high rebound and a large working range.

The invention provides 980MPa-grade hot-dip galvanized low-density steel with low yield ratio and high corrosion resistance and a manufacturing method thereof. A steel plate comprises the following components in percentage by weight: 0.28%-0.32% of C, 0.74%-0.82% of Si, 2.1%-2.32% of Mn, 4.3%-6.5% of Al, less than or equal to 0.010% of P, 0.01%-0.023% of S, 0.01%-0.012% of RE and the balance of Fe and inevitable impurities. The manufacturing method of the steel comprises the steps of blast furnace molten iron pretreatment, converter steelmaking, continuous casting, hot continuous rolling, acid pickling, cold rolling and hot galvanizing.

The invention discloses a hot stamping die for automobile parts, and relates to the technical field of automobile parts processing, including a work platform and a pressure-compensating die assembly, wherein the surface of the work platform is provided with a pressure-compensating die assembly, and transmission cylinders are connected to the two sides of the pressure-compensating box. In the hot stamping die for automobile parts, the lower die and the upper die cooperate to form a steel plate by hot stamping, and at this time, the extended pressing plate descends to push the lifting piston rod to press it into the transmission cylinder, so that the transmission medium inside the transmission cylinder enters the interior of the transmission cylinder through the opening at the bottom of the pressure-compensating cylinder, and each transmission piston rod is pushed up from the bottom thereof, so that each lower die core is closely attached to the lower surface of the steel plate and is pressed upward, thereby cooperating with the downward pressure of the upper die to strengthen the stamping strength of the steel plate, thereby reducing the possibility of the steel plate rebounding, and since the lower die core is modularly arranged, it can evenly apply upward pressure to each part of the complex automobile parts when forming them.

The utility model relates to hydraulic technology field especially, and it is the device of pulling and holding with precise release force and buffer function. The device of pulling and holding contains outer tube (2) and internal cavity (8), outer tube (2) and internal cavity (8) can slide and limit each other, the square hole is contained on oil guide rod (709), and the square hole is placed in auxiliary valve bushing (707), and the square hole is connected with the internal space of oil guide rod (709), when the square hole is pushed out valve bushing, the square hole can connect low pressure space (14) and high pressure space (15), guide rod (704) and oil guide rod (709) are installed on the piston and can move together. The device of pulling and holding has the advantages of simple structure, easy maintenance, high reliability, and has the characteristics of repeated use, accurate release.

The utility model relates to the technical field of filters, and provides an automobile air filter convenient to disassemble and clean, which comprises a shell, one side of the shell penetrates through and is fixedly connected with an air inlet pipe, the other side of the shell penetrates through and is fixedly connected with an air outlet pipe, the top of the shell is provided with an insertion port, and the insertion port is provided with an air inlet. A mounting and dismounting mechanism is arranged in the shell, a retarding mechanism is arranged at the top of the shell, and the mounting and dismounting mechanism is arranged in the shell, so that the filter element mounting plate can be bounced upwards by a certain distance to be separated from the slot by simultaneously pressing two groups of corresponding pressing rods during maintenance work; when the filter element mounting plate is remounted, the filter element mounting plate integrally enters the shell along the insertion opening, and when the bottom of the filter element mounting plate is inserted into the insertion groove, the filter element mounting plate is fixed through cooperation of the arc-shaped block, the telescopic spring and other components, so that the filter element mounting plate is simple to mount and dismount, and maintenance and cleaning are facilitated.

The utility model relates to the technical field of mechanical parts, in particular to a parallel type independent air spring vibration isolation platform which comprises two fixing tables, device bodies used for detection are arranged on the fixing tables, and compression shafts used for dispersing excessive pressure are symmetrically arranged at the bottoms of the fixing tables. The compression shafts are provided with rubber pads used for improving the friction force between the compression shafts and the ground, threaded rods used for improving the stability of the device body are symmetrically arranged on the fixing tables, and the two fixing tables are fixedly connected through a first connecting shaft. Through the arrangement of the fixer and the clamping ring, after the device body is placed on the fixing table, the stability of the device body on the fixing table can be effectively improved, the phenomena of displacement and toppling when a plurality of plates are pressed on the device body can be avoided, the feedback quality after the device body is pressed is further improved, and the production efficiency is improved. And meanwhile, workers can easily obtain effective feedback data, so that the detection efficiency of the device body is improved.

The application discloses a three-way catalyst reducer shaping tool composite die set, which comprises a fixed die seat, the upper end face of which is provided with a lower die seat in parallel, two symmetrically arranged side die frames, which are symmetrically fixed on the fixed die seat and located on the two sides of the lower die seat, an upper stamping seat arranged above the fixed die seat, a first forming die set and a second forming die set, each of which is composed of two model plates arranged in an up-down mode, a die closing mechanism arranged below the lower die seat, and a plurality of reducer units, each of which is arranged at two reducer shaping ports of the first forming die set and the second forming die set. The double die set design of the application combines pre-reducing with accurate reducing, step-by-step forming is realized, size out-of-control caused by single large deformation is avoided, and a micro dynamic spinning shaping force is applied to the inside of the shell, so that the rebound is significantly reduced and the size stability after reducing is ensured.

The utility model discloses a low-pressure-maintaining high-pressure pump, which belongs to the technical field of high-pressure pumps, solves the problem that the pressure in a pump body is larger in a gun closing state, and adopts the technical scheme that the low-pressure-maintaining high-pressure pump comprises a pump body, the pump body is connected with a water inlet pipeline and a water outlet pipeline, and a first chamber and a second chamber are arranged in the pump body; a pressure retaining valve is arranged between the first cavity and the water outlet pipeline, a one-way valve is arranged in the pressure retaining valve, an overflow valve is arranged in the second cavity, the second cavity is divided into a movable cavity and a pressure relief cavity in a sealed mode, the overflow valve comprises a first valve element, a piston and a valve head, the valve head is located in the movable cavity, and the inner diameter of the movable cavity is larger than that of the pressure relief cavity. The peripheral side of the valve head is sleeved with a first sealing ring, and the first sealing ring is in sealing fit with the inner wall of the movable cavity. The high-pressure cleaning machine is mainly used for achieving low pressure maintaining, the pressure in the pump body, the high-pressure pipe and the high-pressure gun after the gun is closed is reduced, the burden of the pump body is reduced, the re-starting resistance is reduced, and the user experience is improved.