47results about How to "Limited activity space" patented technology

The invention relates to a sow obstetric table structure for preventing piggy from being pressed, comprising sow rails (1), wherein the sow rails (1) are located on two sides of the sow; a piggy anti-pressing device is installed on each sow rail (1) on two sides of the sow respectively. Because the piggy anti-pressing device is installed on each sow rail (1) on two sides of the sow respectively in the invention, the piggy anti-pressing devices can limit the movement space of the sow when the sow stands and enters the sow rails, and reduces the laying speed of the sow when the sow lays suddenly to enable the piggy to have enough time to leave, so that the piggy can be avoided from being injured or died due to pressing of the sow.

The invention discloses a protective net device for a vehicle, which comprises two lower fixing seats, a rotating seat is arranged at the center of the upper surface of the lower fixing seats, and a rotating rod is connected to the inner part of the rotating seat, and the rotating rod The inner surface of the rotating rod is fixedly connected with a baffle plate, the upper surface of the rotating rod is fixedly installed with an arc frame, and the inner center of the arc frame is fixedly connected with a reinforcing beam, and both sides of the reinforcing beam are fixedly installed with glass A cylindrical frame is fixedly connected to the inner center of the reinforcing beam, and a rotating cavity is arranged inside the cylindrical frame, and card seats are fixedly connected to both sides of the upper surface of the arc-shaped frame, and the inside of the card seat A T-shaped chute is provided, and the inside of the T-shaped chute is slidably connected with an upper fixing seat through a T-shaped slider. The automobile electronic anti-robbery net device is not only convenient for installation and use through the connection structure of the upper fixing seat and the lower fixing seat, but also can greatly improve the safety of people in the car.

The invention discloses a pressure-balancing one-way valve for coiled-tubing layering fracturing. The pressure-balancing one-way valve comprises an upper joint, a limiting connecting sleeve, a body, a sealing head and a lower joint which are successively connected, wherein the inner part of the upper joint is of a hole-shrinkage cavity structure, a check ring and a sealing ball are mounted in a cavity in the upper part of the upper joint, the sealing ball is mounted at a hole shrinkage part, the check ring is mounted above the sealing ball, the lower end of the upper joint is fixedly connected with the sealing head and the sealing head is sleeved on the upper joint, the limiting connecting sleeve is sleeved on the upper joint, the body is sleeved on the limiting connecting sleeve and the sealing head and fixedly connected with the limiting connecting sleeve, a sliding gap is formed between the sealing head and the limiting connecting sleeve, and the lower joint stretches into the lower end of the body and is fixedly connected with the body. The pressure-balancing one-way valve for coiled-tubing layering fracturing has the characteristic of simple structure; and due to the adoption of the pressure-balancing one-way valve for coiled-tubing layering fracturing, the effects of packing and setting of an annular mechanical packer can be effectively improved, the setting and the packing are facilitated, and the abrasive perforating and the reverse-circulation sand-washing deblocking of a sand blower are facilitated.

The invention discloses a material mechanics test device and a using method thereof, and relates to the technical field of material mechanics tests. Including the casing, the sample placing mechanism, the hammer body placing mechanism, the hammer body launching mechanism, the height scale is arranged in the casing, the sample placing mechanism for clamping the sample, the hammer body placing mechanism for placing the hammer body, The hammer body launch mechanism used to launch the hammer body upwards and break the sample is connected with the casing sequentially from top to bottom. The present invention can reduce the space required for the impact toughness test.

The invention discloses a full-premix burner, and relates to the technical field of burners. The full-premix burner comprises a fan, a mixing chamber shell, a burning head and an igniter, wherein the mixing chamber shell is connected between the fan and the burning head; an air main pipe and a gas main pipe are arranged in the mixing chamber shell; multiple air branch pipes communicate to the air main pipe; multiple gas branch pipes communicate to the gas main pipe; the outlet ends of the air branch pipes are deviated from the fan; the multiple gas branch pipes communicate to the air branch pipes in a one-to-one corresponding way; a connecting plate is arranged between the air branch pipes and the burning head; two ends of the connecting plate are in sealed connection with the multiple air branch pipes and the burning head; and air guiding holes corresponding to the multiple air branch pipes are formed in the connecting plate. The full-premix burner provided by the invention has the effects of simple structure, low processing cost, a good mixing effect of gas and air, and a stable mixing result.