8results about How to "Constant length" patented technology

The utility model relates to the technical field of compressor overhauling, especially a piston body back loading device of compressor, including support rod and at least one group of support components, each group of support components includes at least two length adjustable support arms that are evenly arranged along the circumference, one end of the support arm is connected with the support rod, and the other end is used for contacting with the inner wall of cylinder, after length adjustment, the support arm length of the same group of support components is same, the end part of support rod is equipped with the connector, and the connector is connected with the piston body by detachable connection mode, the support rod, the connector and the piston body are coaxial arrangement, the support rod rotates and is used for driving the piston body to rotate, the device can reduce the friction between the piston body and the inner wall of cylinder in the back loading process by slightly lifting the piston body, and reduces the resistance.

The utility model relates to the technical field of motorcycle accessories, especially a length-adjustable motorcycle rocker arm pull rod structure, which comprises a fixed rod, one end of the fixed rod is provided with a movable rod, one end of the movable rod is fixedly connected with an extension rod, a locking groove is formed in the outer wall of the extension rod, the extension rod is located inside the fixed rod, an extension groove is formed in the inner wall of the fixed rod, a plurality of extension grooves are provided with extension blocks inside, the outer wall of one end of the extension block is fixedly connected with a locking block, the outer wall of the locking block is fixedly connected with a baffle, the outer wall of the end of the fixed rod is fixedly connected with a fixed ring, the outer wall of the fixed rod is sleeved with a moving ring, the outer wall of the moving ring is fixedly connected with a locking ring, the locking ring is located inside the fixed ring, a screw thread is formed in the outer wall of the fixed rod, and the outer wall of the fixed rod provided with the screw thread is screwed with a screw ring. The utility model realizes the integrated function of quick adjustment and firm locking and is suitable for different scenes.

This invention provides a retractable, assembled concrete chute, relating to the field of concrete chute technology. The chute is composed of multiple individual chutes, each a cylindrical structure with one end larger than the other. Adjacent individual chutes are matched at their connecting ends. A chute assembly and fixing assembly is installed between adjacent individual chutes to fix them relatively. This assembly includes limiting members that are fixed to the individual chutes and connected to the limiting members of adjacent individual chutes. A vibrator is installed around the periphery of the individual chutes located in the middle of the chute. This invention allows for an adjustable number of individual chutes, thus changing the actual length of the assembled chute. Connected between the concrete mixer truck and the construction site, it adapts to complex mountainous terrain, is less restricted by road conditions, and effectively solves the problem of high dependence on pump trucks in large-volume continuous concrete construction. The retractable chute also facilitates transportation and storage.

The utility model relates to aluminium alloy template processing equipment technical field, concretely for a kind of surface treatment equipment for aluminium alloy template processing, including main part, installation frame, mounting bracket, driver, polishing absorber and limiting device, the installation frame is installed in the upper surface of main part, the mounting bracket is fixedly connected at the both ends of main part, the driver is installed in the inside of installation frame, the polishing absorber is installed in the inside of installation frame, the limiting device is installed in the inside of mounting bracket, the limiting device includes slide and sliding plate, the slide is fixedly connected in the inside of mounting bracket, the sliding plate is slidably connected on the surface of slide, the surface of slide is equipped with adjusting hole, the surface of sliding plate is rotatably connected with gyro wheel, the surface of sliding plate is equipped with moving hole away from gyro wheel one end, the inside sliding connection of moving hole has abutment rod. The utility model limiting device, the positioning movement of material is realized, and the stability of equipment is improved.

This disclosure provides a work control method, device, and work vehicle, relating to the field of engineering machinery technology. The method includes: acquiring a first angle between the main boom of the work vehicle and the ground, and a first boom length; controlling the luffing cylinder of the work vehicle to luff at a preset luffing speed corresponding to the first angle; acquiring a second angle between the main boom and the ground after luffing, and a second boom length after luffing; determining a first target boom length based on the first boom length, the first angle, and the second angle; and controlling the extension amount of the telescopic cylinder of the work vehicle when the second boom length differs from the first target boom length, so that the boom length reaches the first target boom length. This improves the accuracy of work control.

This invention relates to a self-controlled temperature testing device and method for delayed-bonding prestressed tendons. The self-controlled temperature testing device for delayed-bonding prestressed tendons includes a loading and unloading device, a heating and insulation device, a measuring and sensing device, an automated control device, and a data acquisition, transmission, processing, and analysis device. This invention utilizes concrete specimens to simulate field conditions, embedding delayed-bonding prestressed tendons in the middle of the concrete specimens. Before the test, the required length of the prepared delayed-bonding prestressed tendons is calculated to ensure that the length of the prestressed tendons within the concrete specimen remains constant throughout the test. The relationship between the viscosity coefficient and temperature, and the relationship between the equivalent curing period and bond strength are fitted using selected functional relationships. Then, by recording the time and temperature at the field, the equivalent curing period, viscosity coefficient, and bond strength are directly obtained, thereby guiding the loading of delayed-bonding prestressed members in the field.

This invention discloses an opening and closing surgical instrument, comprising: a wrist support; a palm support; and a finger opening and closing assembly, wherein the finger opening and closing assembly is rotatably disposed at the other end of the palm support. The finger opening and closing assembly includes: a first opening and closing part and a second opening and closing part; a control assembly, including a finger operating part; and two sets of guide wheel assemblies. This invention allows the finger operating part to adjust the opening and closing position of the finger opening and closing assembly. The first and second guide wheel sets in the guide wheel assembly respectively support the movement of the first and second opening and closing parts on the finger opening and closing assembly. Simultaneously, since the two sets of guide wheel assemblies are centrally symmetrically arranged on both sides of the palm support, and the finger operating part is wound around the two sets of guide wheel assemblies in opposite directions on both sides, the length of the finger operating part remains constant during movement in all degrees of freedom, thus eliminating the need for a separate decoupling mechanism. This effectively improves the reliability of movement between the instruments.

The utility model discloses a cleaning brush convenient to use, which comprises a brush head, an adjusting mechanism is arranged on the brush head, the adjusting mechanism comprises a fixed pipe, two double-side pipes, a guide rod and a telescopic rod, the fixed pipe is fixedly arranged on the brush head, the two double-side pipes are fixedly arranged on the brush head, and the guide rod is fixedly arranged on the brush head. According to the innovative cleaning brush convenient to use, by means of the unique bidirectional self-locking adjusting mechanism design, the technical problem that a traditional cleaning tool is inconvenient to adjust when dealing with cleaning scenes of different heights is effectively solved, the cleaning brush is convenient to use, and the cleaning brush is convenient to use. The multifunctional cleaning tool which is easy and convenient to operate, accurate in adjustment and firm in locking is provided for a user. The core innovation point of the cleaning brush is that the cleaning brush is provided with a unique bidirectional self-locking adjusting system, a user can quickly unlock and adjust the length of a tool only through simple single-hand kneading operation, the system is automatically locked after the cleaning brush is loosened, and it is ensured that the length is stable and unchanged in the cleaning process.