34results about How to "Realize the function of holding pressure" patented technology

The invention relates to a seabed refrigeration pressure retaining type gravity piston sampling device and a sampling method thereof. The sampling device provided by the invention is formed by a gravity sampling pipe, a refrigeration mechanism and a pressure retaining mechanism. The sampling pipe is formed by an outer pipe, an inner pipe, a piston, a piston rod and a counterweight connector; a cavity between the outer pipe and the inner pipe forms a refrigeration cavity; a cold storage mechanism is arranged on the upper end of the counterweight connector. The pressure retaining mechanism is arranged in the sampling pipe, and is formed by an impact block, a positioning steel ball, a positioning spring, a pushing rod, a thrust spring, a rocking bar, a connecting rod and a pressure retaining ball valve. The sampling method provided by the invention comprises the following steps of enabling a natural gas hydrate layer to penetrate into the cavity sampling device by utilizing kinetic energy and gravitational potential energy during a process of lowering to a seabed through the cavity sampling device, closing a cavity of the cavity sampling device, and meanwhile, injecting a cold source into a refrigerating cavity refrigerating core from the cold storage cavity. On one hand, the critical decomposition pressure of the natural gas hydrate is reduced, and on the other hand, a self-protection effect of the natural gas hydrate is improved, so that the decomposition of natural gas is reduced, and the requirement on a natural gas hydrate pressure retaining mechanism is reduced.

The invention provides an array type inner supporting clamp for a large spherical crown type thin-walled workpiece and a flexible clamping method, and belongs to the technical field of clamping. The array type inner supporting clamp is composed of a hydraulic driving system, a positioning and clamping device and an auxiliary device. The hydraulic driving system is used for driving a hydraulic cylinder to act, then a rubber plate is driven to move, and inner supporting clamping is achieved. According to the array type inner supporting clamp for the large spherical crown type thin-walled workpiece and the flexible clamping method, the manner that an inner tire film and automatic supporting are combined is adopted, the structure is simple, automatic inner supporting array type arrangement is achieved, all sets of automatic inner supporting independently act, the array type inner supporting clamp can adapt to the inner surface of a complex workpiece, and tight attaching of the array type inner supporting clamp and the inner surface of the complex workpiece is achieved; meanwhile, a pressing disc and a pressing ring are adopted for conducting auxiliary clamping on an upper non-machined area and a lower non-machined area of the workpiece, and the overall rigidity of the workpiece can be guaranteed; a connecting valve is adopted for controlling clamping and loosening of the clamp, operation is convenient and fast, the pressure maintaining function is achieved, and cost is saved; and flexible, fast and reliable clamping of the spherical crown type thin-walled workpiece is achieved.

The invention provides a novel large-tonnage forklift environmental sanitation accessory which comprises a fork rack assembly, freight fork assemblies and a turnover hydraulic assembly. The fork rack assembly comprises a fork rack body; shaft supporting plates used for movably connecting the freight fork assemblies are arranged at the lower end of the fork rack body; upper hooks used for hanging an environmental sanitation box are arranged at the upper end of the fork rack body; the turnover hydraulic assembly comprises one turnover oil cylinder or two turnover oil cylinders and a high-pressure oil pipe used for providing hydraulic oil for the turnover oil cylinders; a cylinder seat of each turnover oil cylinder is connected with the fork rack body; a piston rod of each turnover oil cylinder is connected with the corresponding freight fork assembly to form a connecting rod mechanism; each turnover oil cylinder is used for driving the corresponding freight fork assembly to rotate downwards. The novel large-tonnage forklift environmental sanitation accessory has a wide-angle turnover function, and it is guaranteed that freight or garbage can be dumped completely; when the environmental sanitation box is not in use, the accessory can shovel ordinary freight like an ordinary forklift, and the accessory has a large declination angle, so that the freight can be unloaded rapidly without inclining a gantry of the forklift,

The invention provides a hydraulic system capable of lowering hydraulic oil source startup frequency of an AMT (Automated Mechanical Transmission). The system comprises a one-way valve (1), a hydraulic control one-way valve (2) and a pressure sensor (3), wherein the one-way valve (1) comprises inlets, which are respectively connected with an oil filter (4) and a control end of the hydraulic control one-way valve (2), and outlets which are respectively connected with a gear shift control valve and an oil inlet of the hydraulic control one-way valve (2); an oil outlet of the hydraulic control one-way valve (2) is connected with a power accumulator (5) and the pressure sensor (3) respectively. According to the hydraulic system, the hydraulic oil source startup frequency of the AMT caused by hydraulic pressure leakage can be effectively lowered when an AMT system has no gear shifting action, and thus, the service lives of a hydraulic oil source and a control relay are prolonged.

The present invention relates to the technological field for medical instrument, which comprises a medical micro pump used in artificial anus sphincter. Among the present invention, one end of the output shaft of the motor is directly connected with the screw rod. The screw rod is connected with a nut plate, which is close to a piston cavity. The other end of the motor is directly connected with a reducer. The output shaft of the reducer is directly connected with a cam wheel device. The first medical catheter is connected with a piston cavity through a first one-way valve. The first medical catheter is divided into two paths, which is connected with a second switch and a third switch, respectively. The second switch and the third switch are connected with a first vessel and a second vessel through the cam wheel. The second medical catheter is connected with a piston cavity through a second one-way valve. The second medical catheter is divided into two paths, which is connected with a first switch and a fourth switch, respectively. The first switch and the fourth switch are connected with a first vessel and a second vessel through the cam wheel. The present invention is capable of realizing bidirectional fluid discharging between a Schnabel bag and a liquid storage bag. The present invention is also capable of realizing pressure-keeping function in any position.

The invention discloses a clamp synchronous control system, a clamp device and a drilling machine in the technical field of clamp control. The clamp synchronous control system comprises an oil supply unit and synchronous control valve blocks; the oil supply unit is used for providing hydraulic oil required by work; and the synchronous control valve blocks are used for balancing the hydraulic oil flowing to each clamp so as to keep the synchronous movement of each clamping oil cylinder of each clamp. The synchronous control valve blocks are arranged between the oil supply unit and the clamp clamping oil cylinders, the synchronous control valve blocks are used for balancing hydraulic oil flowing to the clamps so as to keep synchronous movement of the clamping oil cylinders of the clamps, and the clamp synchronous control system has the advantage that the left oil cylinder and the right oil cylinder of the clamps can keep synchronous telescopic under the condition of different loads, and the problems that a threaded end of a drill rod is damaged during screwing-on and screwing-off, and the screwing-off efficiency is low are solved.

The invention relates to a power bus duct accessory processing method. Power bus duct accessory processing equipment comprises a main board, a molding device and a leveling device, the upper end of the main board is provided with the molding device, the right side of the molding device is provided with the leveling device, and the leveling device is arranged at the upper end of a bottom plate. The method can solve the problems that when the existing equipment corrects a copper bar in a power bus duct, area limiting cannot be conducted on the copper bar when the copper bar is corrected, the phenomenon that the area is increased easily due to too large stress on the copper bar is caused, therefore, the copper bar correction effect is reduced, meanwhile, a gradual feeding flattening mode cannot be adopted, the copper bar cannot be flattened in a multi-section mode, the phenomenon that the copper bar is not flattened completely easily occurs, the copper bar flattening effect is reduced, in addition, intermittent pressure cannot be applied to the copper bar after the copper bar is flattened, the pressure maintaining function cannot be achieved, and the copper bar is prone to rebound.

The invention discloses a tire inflation and deflation system and a vehicle, and relates to the technical field of tire pressure control; the tire inflation and deflation system comprises at least one inflation and deflation unit, and each inflation and deflation unit comprises an air pump, an air pipe and a wheel side control valve assembly; the air pump is communicated with the tire through the air pipe and is used for inflating the tire; the wheel side control valve assembly comprises a wheel side ECU and a sensor for monitoring the tire pressure in real time; a one-way valve that is arranged on the air pipe; a deflation electromagnetic valve that is used for deflating the tire. The tire pressure monitoring device has the advantages that the tire pressure can be monitored in real time under the action of the sensor, so that the tire pressure can be adjusted in real time; wherein the components of the wheel side control valve assembly are arranged independently and can be disassembled and assembled independently, and the overhaul and maintenance cost is low.

An internal meshing cycloidal gear type hydraulic transformer comprises a casing (1), an eccentric sleeve (2) internally arranged on the casing (1), an internal meshing cycloidal rotor pair (3) sleeved with the eccentric sleeve (2) as well as an upper end cover (4) and a lower end cover (5) which are connected on two sides of the casing (1) through bolts (6) respectively. The hydraulic transformerhas the beneficial effects as follows: the hydraulic transformer has the remarkable advantages of small size, low weight, simple structure, easiness in manufacturing, high compression frequency, small flow pulsation, stable running and multiple functions, and for the cycloidal gear type hydraulic transformer with the position of a flow distributing barrier between an unloading oil opening and a pressurizing oil opening fixed, different pressurization or depressurization ratios can be realized through exchange of the unloading oil opening and the pressurizing oil opening.