39results about How to "Realize holding pressure" patented technology

The invention discloses a gas flow control device. A control gas passage is arranged in a body of the gas flow control device, one end of the control gas passage is connected with a cavity in the body, the other end of the control gas passage is connected with a cavity at a gland end of a connecting rod, and the gas flow control device is additionally provided with an auxiliary gas sac. When the gas flow control device is used for inflating, gas flow blocks a gas return passage, an inflating gas passage is opened, and one-way inflation is realized; when gas returns, the gas flow blocks the inflating gas passage, and the gas return passage is smoothly opened under the effect of the auxiliary gas sac; and when either inflation or gas return is not required, the gas flow control device can realize a pressure maintaining function.

The invention relates to a fast multi-directional multifunctional hydraulic control valve, which includes a valve core, a valve body and a valve seat, wherein the valve core is arranged in the inner cavity of the valve body, and the valve seat is fixed on the The upper end of the body; the valve core is provided with a differential hole, which causes a pressure difference between the upper and lower ends of the valve core; the valve seat is provided with a control hole, and the differential hole, the upper cavity of the valve core and the control hole are connected; When the hydraulic valve is opened, the hydraulic oil in the main oil circuit forms an oil circuit through the differential hole, the upper cavity of the spool and the control hole; when the control hole is closed, the spool is on the upper part of the spool The cavity moves under the action of high-pressure hydraulic oil to close the hydraulic control valve. The hydraulic control valve of the present invention is provided with a differential hole, which is quick in response and sensitive, and can also realize pressure maintenance.

The invention discloses a forging equipment and a forging method for copper parts, which have the characteristics of high forging efficiency and good forming quality. The hydraulic equipment includes a frame, a lower die, an upper die, a top stamping cylinder, a rear stamping cylinder, a left stamping cylinder and a right stamping cylinder, and there are rear ejector pins, left ejector pins and The right ejector pin, the lower die is fixed on the frame, the top stamping cylinder is fixed on the frame and used to drive the upper die up and down, the rear stamping cylinder is fixed on the frame and used to drive the rear ejector pin to expand and contract, the left stamping cylinder It is fixed on the frame and is used to drive the expansion and contraction of the left top pin, and the right stamping cylinder is fixed on the frame and is used to drive the expansion and contraction of the right top pin. The hydraulic drive system is used to control the top stamping cylinder, rear side stamping cylinder, left cylinder and the running state of the right stamping cylinder, the present invention is applicable to the field of forging technology.

The invention provides a gas circuit contact piece, which includes a gas circuit pin and a gas circuit jack, both of which are provided with a through inner hole, and the inner hole of the gas circuit jack is provided with a valve body and a sealing body , Valve seat and return spring, wherein the valve body and the valve seat are connected by threads, a sealing body is arranged between the valve body and the valve seat, the sealing body is attached to the inner hole wall of the gas circuit jack, and one end of the return spring is in contact with the valve seat , the other end of the return spring is fixed, a number of sealing grooves are arranged at intervals at the right end of the air circuit pin, and a sealing ring is arranged in the sealing groove. The invention also provides an electrical connector with the air circuit contact. The gas circuit contact provided by the present invention can automatically close the gas circuit channel after the gas circuit pin and the gas circuit socket are separated, so as to realize the functions of maintaining the pressure of the gas circuit, preventing dust, and blocking foreign objects. At the same time, the cross-sectional area of ​​the gas path is large, which can transmit more gas media and take away more heat in the same time. For systems with large heat generation, it can meet the function of cooling protection.

The invention discloses a device and method for controlling the springback of sheet metal forming. The device includes a conveying device, a pressing device and a tempering device, and reduces the residual stress of the sheet material after processing by local pressurization and tempering; the steps are as follows: (1 ) to collect the formed sheet, (2) send the sheet carbon to the compacting device, (3) compact for a period of time, (4) slowly heat the sheet, (5) slowly cool the sheet after heating to a certain extent; the equipment includes: conveying device, Compression device and tempering device.

The invention provides an in-situ preserving coring system and method, and belongs to the field of in-situ mechanical research of rock masses. The coring system comprises a coring drilling tool and rock core preserving equipment, the coring drilling tool comprises a drill bit and a drilling tool body connected with the drill bit, a pressure testing device is arranged on the portion, close to the drill bit, of the side wall of one end of the drilling tool body, and a temperature testing device and a humidity testing device are arranged above the pressure testing device; the rock core preserving equipment comprises an equipment body, a core storage tube capable of freely sliding in the equipment body in the axial direction is arranged in the equipment body, the core storage tube is a hollow cavity and is used for storing rock cores subjected to drilling, the outer wall of the equipment body is provided with a pressure preserving device, a heat preserving device and a humidity preserving device which are connected with the core storage tube respectively, and a ball valve connected with the front end of the equipment body is further included. The ball valve is switched on, rock core drilling is conducted, the drilled rock cores gradually enter the core storage tube along with drilling of the coring drilling tool, after rock core drilling is completed, the ball valve is switched off, and the drilled rock cores are stored in the sealed core storage tube. The in-situ preserving coring system and method are suitable for mechanical property research of the rock masses.

The invention discloses a coring device and a coring method. The coring device includes an upper connecting buckle, a coring outer cylinder and a coring drill bit connected in sequence, the inner hole of the connecting buckle of the upper connecting buckle, the The inner hole of the core outer cylinder and the inner hole of the core bit are connected to form a first shaft hole, and a detachable valve, a slidable differential lifting rod, and a valve connected to the first shaft hole are arranged in the first shaft hole. The core-taking inner cylinder of the differential lifting rod, the core-taking hole of the core-taking drill bit communicates with the core-taking inner cylinder through the valve, and the differential lifting rod is also connected with a lifting mechanism, and the lifting mechanism can drive The differential lifting rod and the coring inner cylinder are separated from the valve by a certain distance and the valve is closed; the coring method includes putting in a sealing ball to make the lifting mechanism drive the differential lifting rod to rise. In the present invention, the valve is closed after the rock core is away from the valve for a certain distance, which avoids the problem that the valve is stuck by the rock core, and improves the reliability of heat preservation and pressure-holding coring.