961 results about "Set screw" patented technology

The invention belongs to the technical field of valve maintenance, and particularly relates to a lifting device for a leakage guide ring of a nuclear island gate valve. The upper end of the supporting screw rod is arranged on a valve yoke frame, the lower end of the supporting screw rod is arranged on the drawing support, the drawing support is installed on a valve rod, the half-and-half type lifting nut is installed at the position of a threaded sleeve at the bottom end of the drawing support in a spliced mode and connected with the threaded sleeve through the set screw, and the half-and-half type lifting loop is connected to the lower end of the lifting nut in a hung mode. The lower end of the lifting screw rod is screwed into the original lifting hole and the new lifting hole of the leakage guiding ring, the height of the lifting loop is adjusted in a rotating mode, the upper end of the lifting screw rod is arranged in a screw hole of the lifting loop and is screwed and fixed through a nut, and the operating handle and the rotation preventing handle are arranged in the lifting nut and operating holes in the periphery of the lifting loop respectively. And the drawing bracket is fixed by connecting the original bolt hole of the valve with the supporting screw rod. On the premise of fully considering the limited operation space, the leakage guiding ring is efficiently detached, meanwhile, the complete effect of the leakage guiding ring is guaranteed, and the leakage guiding ring can be repeatedly used.

The invention relates to the technical field of meat drip loss measurement, in particular to a method and equipment for automatically measuring meat drip loss. Comprising a bottom plate, the top end of the bottom plate is fixedly connected with a constant-temperature box, the top of the constant-temperature box is provided with a cover plate through an up-down adjusting assembly, one end of the bottom of the cover plate is fixedly connected with a hollow shaft, the outer side of the hollow shaft is provided with a multi-layer draining frame, and the bottom of the draining frame is provided with a plurality of hanging rods in parallel at intervals; a weighing sensor is arranged between the top of the hanging rod and the draining frame. According to the method and device for automatically measuring the water drop loss of the meat quality, the cover plate is moved upwards, the cover plate can drive the hollow shaft, the draining frame and the drained water collecting device to move upwards to the position above the constant-temperature box in the upward moving process, then positioning screws are unscrewed, the draining frame and the draining frame rotate around the hollow shaft, and the water drop loss of the meat quality is measured. The draining rack, the hanging rod and the hooks are moved to the outer side, meat hanging operation can be flexibly carried out, the safety is good, and the meat hanging efficiency is higher.

An expandable interbody with a modular endplate has an outer column, an inner column threadedly coupled and translatable relative to the outer column along the longitudinal axis, and an expansion ring to adjust a body length of the expandable interbody. The expansion ring has a plurality of teeth, and the outer column has at least one arm for engaging a tooth of the plurality of teeth to lock the expansion ring. The inner column and / or outer column can include a connector for connection to a modular endplate that has a substantially hollow core. The modular endplate includes a plate with a set screw entrapped therein. The modular endplate has an aperture to receive the connector of the inner and / or outer column.

The utility model discloses a welding device for processing an automobile exhaust converter pipe, which comprises a rack, one side of the rack is rotatably connected with a through mounting cylinder, one side of the mounting cylinder is slidably connected with a plurality of clamping frames for clamping a pipeline, the clamping frames are L-shaped, the bottom of one clamping frame is slidably connected with a through limiting frame, and the bottom of the other clamping frame is slidably connected with a clamping plate. The limiting frame is L-shaped and used for limiting a pipeline, a sliding way is formed in the top of the clamping frame provided with the limiting frame, a threaded hole is formed in the side face of the clamping frame, the top of the limiting frame is fixedly connected with a push block, the push block is slidably connected with the sliding way, and a jackscrew is in threaded connection with the interior of the threaded hole. According to the pipeline fixing device, a pipeline can be clamped and fixed by rotating the rotating ring, use is convenient and fast, the pipeline can be limited through the limiting frame, welding and operation of workers are facilitated, the position of the pipeline can be confirmed by observing the pointer and the scale marks, and the adjusting accuracy is improved.

A lid for a container with a flip-straw (or spout) detachable from the lid to for user access to and cleaning of the lid. A pivotable spout is located on and detachable from the lid top. A set screw is located on and detachable from the lid bottom. The set screw is configured to engage and releasably attach the spout to the lid. Attachment may be facilitated by spout insertion into curved tracks with a terminal end in a lid recess. Another straw may be releasably attached to the lid bottom and extend downward into a drinking container. The set screw member may have a channel that passes through it, and that forms a continuous channel (together with the spout and / or other straw) when the spout is flipped up for the fluid passage from the container.

The invention discloses a fine gap-adjustable tilting pad bearing and a control method, and belongs to the technical field of bearings, and the fine gap-adjustable tilting pad bearing comprises a bearing body, pads, pre-tightening screws, set screws, a cover plate, a displacement amplification structure, pre-tightening bolts, elastic gaskets and piezoelectric ceramic stacks. A plurality of tilting pads are arranged on the inner arc surface of the bearing body and are matched with the bearing body through a spherical support; four radial grooves are formed in the outer arc face in the circumferential direction and are opposite to the centers of the four tile blocks respectively. A notch of the radial groove is connected with a cover plate, is internally provided with a piezoelectric ceramic displacement amplification mechanism and is connected with the spherical support through a positioning pin; a piezoelectric ceramic stack is arranged between a left boss and a right boss of the mechanism and is pre-tightened by a pre-tightening bolt and an elastic gasket. According to the invention, the inverse piezoelectric effect of piezoelectric ceramics is utilized, a vibration and non-linear suppression method is provided, an advanced control algorithm is matched, the piezoelectric ceramics stack is electrified and contracted, a displacement amplification effect is generated through a displacement amplification mechanism, the tile gap is finely adjusted, and the high-performance requirement of modern rotating machinery is met.

The key groove milling tool is provided with a V-shaped block, a check block is installed at one end of a V-shaped sinking groove of the V-shaped block, and a flat position positioning block is installed at the other end of the V-shaped sinking groove of the V-shaped block; axial positioning screws are rotationally mounted on the stop blocks, and the axial positioning screws abut against the shaft end faces of the shaft parts to be used for axial positioning of the shaft parts with different lengths; the upper end face of the flat position positioning block is provided with a flat position positioning inclined face, the inclination angle alpha of the flat position positioning inclined face is equal to the included angle between a shaft part key groove and a flat position, and the flat position positioning inclined face makes contact with and is attached to the flat position of the shaft part. The V-shaped block is provided with a pressing plate, and the pressing plate downwards presses the shaft part and tightly presses and fixes the shaft part on the V-shaped block. The technical problem that the machining efficiency is low when a three-axis machining center is used for machining a shaft key groove and a milling key groove with the angle relation between the flat position and the shaft key groove is solved, the structure is simple and compact, economical and practical, clamping is convenient, the machining difficulty is reduced, the machining efficiency is improved, and universality is high.

Expandable spinal implants, systems and methods are disclosed. An expandable spinal implant may include a first endplate, a second endplate, and a moving mechanism that is operably coupled to the first and second endplates. The moving mechanism may include a wedge, a first sliding frame and a second sliding frame disposed on opposite sides of the wedge, a screw guide housing a rotatable first set screw and a rotatable second set screw opposite the first set screw. The first set screw may be operably coupled to the second sliding frame and the second set screw may be operably coupled to the wedge. The moving mechanism may operably adjust a spacing between the first and second endplates upon simultaneous rotation of the first and second set screws and operably adjust an angle of inclination between the first and second endplates upon translating the first set screw or second set screw.

The utility model relates to the technical field of road well lid installation, in particular to a road well lid installation leveling device. In order to solve the problems that a traditional road well lid mounting and leveling method wastes time and labor and is poor in leveling precision, the novel road well lid mounting and leveling device is provided and comprises a cross-shaped rod, supporting legs are arranged at the four free ends of the cross-shaped rod, limiting sleeves are fixed to the side faces of four rod pieces of the cross-shaped rod, and the cross-shaped rod is connected with the supporting legs. A positioning ruler rod is installed in each limiting sleeve in an up-down sliding mode, a limiting threaded hole is formed in the circumferential wall of each limiting sleeve, each limiting threaded hole is matched with a limiting jackscrew, a base plate is fixed to the bottom end of each positioning ruler rod, and each positioning ruler rod is further sleeved with a leveling sleeve in an up-down sliding mode. Leveling threaded holes are formed in the peripheral walls of the leveling sleeves, leveling jackscrews are arranged on the leveling threaded holes in a matched mode, and leveling needles are further fixed to the peripheral faces of the leveling sleeves. The device is simple in structure, accurate in measurement, convenient to manufacture, reusable, convenient to operate and labor-saving.

The utility model relates to a multi-beam laser deposition printing head device. The multi-beam laser deposition printing head device comprises a printing head base, a plurality of shaping optical lens sets, a plurality of mounting bases, a plurality of optical fiber connectors, a plurality of laser position adjusting jackscrews, a plurality of printing head guide nozzles, a feeding pipe and a feeding guide nozzle. By screwing one or more laser position adjusting jackscrews on the mounting seats, the laser position adjusting jackscrews move back and forth in respective laser position adjusting screw holes, the positions of the optical fiber connectors mounted on the mounting seats can be adjusted, and the positions of the optical fiber connectors mounted on the mounting seats can be adjusted by adjusting the positions of the optical fiber connectors on one or more mounting seats. Focusing light spots of multiple light beams are aligned with the feeding position of a coaxial material, and a complex adjusting mechanism does not need to be additionally designed in the whole process for secondary adjustment of the light spot position. Therefore, the multi-beam laser deposition printing head device has the advantages of being simple in structure, small in size and low in manufacturing cost while ensuring that the multi-beam focusing light spots can be accurately aligned with the feeding position of the coaxial material.

Disclosed are reducer instrument locking mechanisms. They can be located near a center pivot joint of the reducer, thereby eliminating a ratchet at the reducer proximal end. The locking mechanisms can include a pawl or latch that travels with one handle from an open position to a closed position. The pawl can fall into a groove formed in an opposing handle such that handles of the reducer can be locked relative to one another, at least with regard to movement of the handles away from one another. When falling into the groove, the pawl can create an auditory and / or tactile indication that a sufficient amount of rod reduction has been achieved to allow for set screw insertion. After set screw insertion, the reducer locking mechanisms can be released to clear it of the groove and allow the reducer to return to its open position.

A device for wall mounting a display including a mount assembly and a swivel mechanism assembly. The mount assembly includes a television mounting portion and an extending / contracting portion and the swivel mechanism assembly moveable between a first and a second configuration and including a biasing component. The extending / contracting portion includes a lower arm, an upper arm, a front bracket, a wall mounting bracket, one or more gas springs, and a linear actuator. The one or more gas springs and the linear actuator may lower and raise the television mounting portion. The biasing component is configured to bias the television mounting portion to swivel in a first or a second direction when the swivel mechanism assembly is in the first configuration when the display mounting portion is lowered. The mount assembly may include a set screw to set a swivel stop for the first and the second swivel directions.

The utility model relates to the technical field of turbine mechanical sealing, and discloses a double-end-face brush type-labyrinth combined sealing structure, which comprises a shaft sleeve connected with a rotor through a shaft sleeve fastening screw; a sealing seat; the double-end-face brush type sealing ring is fixedly arranged with the sealing seat through a brush ring set screw; the double-end-face brush type sealing ring comprises a first brush wire bundle, a front baffle, a first fusion welding area, a middle baffle, a second fusion welding area, a rear baffle and a second brush wire bundle. The labyrinth sealing ring is arranged on the back face of the double-end-face brush type sealing ring, an O-shaped ring is arranged between the labyrinth sealing ring and the sealing seat, the labyrinth sealing ring is fixed to the shell through a check ring, and the shell is connected with the sealing seat through a screw. The double-end-face brush type seal and the labyrinth seal are combined, the double-end-face brush type seal ring saves more materials and space compared with a conventional two-stage end face brush type seal in series connection, the throttling effect of the labyrinth seal plays an auxiliary sealing role, and therefore the sealing effect is better.

An adjustable support arm capable of providing users with a wide range of height, depth, tilt, and swivel options. The adjustable support arm may comprise an arm assembly releasably mounted to a base assembly. In further embodiments, the adjustable support arm may also comprise an articulating joint connected to the arm assembly, and an accessory bracket assembly connected to the articulating joint. A quick-release joint comprising a spring-loaded pivot latch may be utilized to releasably connect the arm assembly to the base assembly. To dampen side-to-side movement of the arm assembly, the adjustable support arm may also comprise a friction cartridge assembly comprising a taper-lock bushing and one or more set screws. A ring-shaped, adjustable panning insert can be coupled to the arm assembly to restrict the range of side-to-side motion of the support arm. The adjustable arm can further comprise a quick-release accessory fastening mechanism for easy removal and attachment of a mounted object (e.g., an electronic display, keyboard, or other item) to the support arm.

An adjustable ball joint which is infinitesimally adjustable using a jam nut wherein no set screws are used. A kit for constructing an adjustable ball joint which is infinitesimally adjustable using a jam nut wherein no set screws are used. A method of assembling an adjustable ball joint which is infinitesimally adjustable using a jam nut wherein no set screws are used.

Implantable devices and assemblies that provide a friction fit between a receiver and a fastener, such as a bone screw. A frictional force is applied between the screw head and both a retention ring and a pressure insert, maintaining and stabilizing the orientation of the receiver relative to the screw head before being fixed by a set screw. This mechanism prevents drooping or slipping of the receiver out of alignment when implanted. Additionally, the devices allow for modular assembly before or during spinal fixation, enabling bottom-side loading of the screw head into the receiver. Various screws with different characteristics can be coupled to the receiver body before or after implantation. The frictional force may be facilitated by one or more ridges on the receiver body that engage the pressure insert, which is resiliently urged against the screw head, providing a spring-like compression force.

A bone fixation system comprises a first fastener configured to anchor into a first vertebrae, a second fastener configured to anchor into a second vertebrae, and a set screw to retain the second fastener to the first fastener. The first fastener includes a shaft extending along a longitudinal axis and a head. The shaft includes a first cylindrical body. The head of the first fastener includes a second cylindrical body defining a passageway having an interior surface. The passageway defines a longitudinal axis that is different than the longitudinal axis of the shaft. The first cylindrical body of the shaft and the second cylindrical body of the head are angled relative to each other. A head of the second fastener is configured to engage the interior surface of the passageway of the head of the first fastener. The set screw retains the head of the second fastener in the passageway.

Disclosed in the present invention is a pull-in rotatable elastic casing centralizer, comprising an upper end ring. A plurality of working rib plates are connected to the bottom of the upper end ring. The sides of the plurality of working rib plates away from the upper end ring are jointly connected to a lower end ring. A stop ring is sleeved on the outer wall of the lower end ring. Also disclosed in the present invention is a centralizing method based on a pull-in rotatable elastic casing centralizer. Before entering a wellbore, the centralizer is sleeved on the outer side of a casing, the lower end ring is mounted in a direction toward a wellhead, set screws distributed on the outer side of the stop ring are tightened, and the entire centralizer is fixed to the casing, thereby completing centralization. After the mounting is completed, the stop ring of the centralizer and the casing are fixed relative to each other, and the entire centralizer is pulled into the wellbore along with the casing, so that the resistance during entering is relatively small, and no destructive impact is caused to rib plates of the centralizer due to difficulty in entering. In addition, even if the centralizer encounters resistance in the wellbore, the pull-in design will not cause destructive compression of the rib plates of the centralizer, allowing the centralizer to more easily pass.

The utility model discloses an easily detachable low-friction wire guiding device which comprises a support and a wire guiding wheel assembly, the wire guiding wheel assembly is installed on the support, the wire guiding wheel assembly comprises a wire guiding wheel, an installation shaft and a bearing, the wire guiding wheel is installed on the installation shaft through the bearing, the installation shaft is fixed on the support, the support is provided with an installation notch, and the installation notch is arranged on the support. The mounting shaft is arranged in the mounting notch, the mounting shaft is fixed in the mounting notch through a set screw, and a plurality of arc-shaped bulges are uniformly distributed on the wire guide wheel. The mounting shaft is a stepped shaft with a large middle and two small ends, a shaft shoulder is arranged in the middle, one side of the bearing is close to the shaft shoulder, and a retainer ring is arranged on the other side of the bearing. A right dustproof cover is arranged on the right side of the wire guide wheel, and one end of the right dustproof cover abuts against the bearing. A left dustproof cover is arranged on the left side of the guide wheel. The problems that an existing wire guiding device is inconvenient to use and disassemble, and wires are prone to being abraded are solved.

The present invention relates to a split steel plate end-fixed and embracing spinal canal shaping internal fixation device, comprising a straight-edge steel plate and a beveled steel plate distributed on the left and right sides of the spinous process, wherein the straight-edge steel plate has a decompression groove straight edge extending from one side close to the spinous process, a straight-edge guide rail in contact with the spinous process is provided on the outer side of the decompression groove straight edge, and a plurality of positioning screws are provided on the straight-edge steel plate; the beveled steel plate has a decompression groove bevel extending from one side close to the spinous process, a beveled guide rail in contact with the spinous process is provided on the outer side of the beveled steel plate, and a plurality of positioning screws are provided on the beveled steel plate. Thus, the reliability of use and coordination can be effectively improved, the difficulty of use can be reduced, and the labor intensity of medical staff can be reduced. The overall structure is simple and easy to manufacture. A corresponding accommodating cavity can be added to achieve drug delivery, further reducing the number of operating steps.

The utility model discloses a supporting tool convenient for preparing a surface coating of a ball core piece, which belongs to the field of alloy coating preparation and is characterized in that a supporting sleeve is sleeved on a working connecting rod, an adjusting screw hole and a positioning screw hole are arranged on the supporting sleeve, and a positioning screw is used for connecting the supporting sleeve with the working connecting rod through the positioning screw hole; the adjusting screw is detachably connected into the adjusting screw hole through a thread; the operation ball core piece is arranged on the supporting sleeve in a sleeving mode, and the inner surface of the operation ball core piece abuts against the top end of the adjusting screw. According to the utility model, two line supports are matched with one central point support and conform to the equilateral triangle design principle, so that the gravity center of the tool and the gravity center of a working piece are ingeniously overlapped together, and the eccentricity ratio is reduced, thereby reducing the coating defects caused by eccentricity and jumping in the coating preparation process and improving the coating quality of products.

The utility model belongs to the technical field of optical gauges, and particularly discloses a device for calibrating the optical axis of a binocular telescope. A double-tube front lens of the device is fixed on the upper portion of an adjusting frame, a collimator, a supporting seat and the adjusting frame are sequentially arranged on a workbench, a cross reticle I is arranged in the collimator, cross reticles II are arranged in lens bodies of the double-tube front lens, and a supporting flat plate for placing a binocular is arranged at the top end of the supporting seat. Three adjusting screws I in threaded connection are evenly distributed on a base I of the adjusting frame in the circumferential direction, a bottom sleeve is vertically fixed to the middle of the upper surface of the base I, the lower portion of a lifting rod extends into the bottom sleeve in a sliding mode, a set screw is arranged on the side wall of the bottom sleeve to lock the lifting rod, and a double-tube front mirror is detachably and fixedly connected to the top end of the lifting rod. According to the utility model, the binocular telescope can be directly placed on the supporting flat plate of the supporting seat to directly detect the optical axis deviation, and the device has the characteristics of simple structure, convenient detection, flexible adjustment and low cost.

The invention discloses a split type stern tube bearing coaxiality positioning device which comprises an adjustable light target assembly, a centering device, a light target receiver, a collimation light observation instrument and a laser measuring instrument, the adjustable light target assembly comprises a light target frame and an adjusting jackscrew, and the adjusting jackscrew is arranged on the outer side of the light target frame in the circumferential direction; an outer support, a middle support and an inner support are installed on the inner side of the light target frame, the middle support is arranged on the outer support in a sliding mode in the up-down direction, the inner support is arranged on the middle support in a sliding mode in the left-right direction, and an installation hole capable of installing a light target is formed in the inner support. The connecting body can be matched and assembled with the mounting hole, the magnetic meter rod is rotatably mounted on the connecting body, and the dial indicator is connected to the magnetic meter rod. According to the positioning method for the split type stern tube bearings, the multiple bearings on the split type stern tube can be coaxially positioned, the requirement for high-precision installation of the multiple bearings is met, the ship performance is guaranteed, and the invention further provides a positioning method for the split type stern tube bearings.

In order to overcome the defects in the prior art, the utility model provides an adjustable pressure gauge fastening device which comprises a main pipeline clamp which is locked through a first fastening bolt. A vertical supporting column is arranged on the outer surface of one side of the main pipeline clamp in the vertical direction, the vertical supporting column is sleeved with a supporting column sliding sleeve in a sliding mode, and a second fastening bolt is arranged on the side wall of the supporting column sliding sleeve. A transverse supporting column is fixed to the side wall, opposite to the second fastening bolt, of the supporting column sliding sleeve, and a pressure gauge pipe clamp is fixed to the tail end of the transverse supporting column. The pressure gauge pipe clamp is locked through a third fastening bolt, and a fourth fastening bolt for fixing a pressure gauge is arranged on the side wall of the pressure gauge pipe clamp. According to the utility model, through the arrangement of the main pipeline clamp and the pressure gauge pipe clamp, the application range of the pressure gauge fastening device is expanded. And through the arrangement of the vertical supporting column and the supporting column sliding sleeve, the installation position of the pressure gauge has high adjustability.

The present invention discloses a design method for a screw-type limiting mechanism of a metamaterial vibration isolator, which belongs to the cross-technical field of metamaterials, vibration reduction and noise reduction. The screw-type limiting mechanism includes an upper plate of the vibration isolator, a lower plate of the vibration isolator, a cylinder, a long screw, a block and a locking screw. The upper and lower surfaces of the upper plate of the vibration isolator are respectively processed with mutually interpenetrating grooves, and the cylinder is rigidly connected to the lower plate of the vibration isolator; a circular block is rigidly assembled on the long screw, and the long screw is passed through the through hole of the groove of the upper plate of the vibration isolator and then screwed into the threaded through hole of the cylinder of the lower plate of the vibration isolator. By adjusting the screw-in depth, the limiting gap in the tension and compression directions is adjusted; a set screw is screwed into the threaded through hole on the other end face of the cylinder until the end face of the set screw contacts the end face of the long screw and then tightened. The present invention enables the metamaterial vibration isolator to have omnidirectional limiting functions in the tension, compression and 360° shear directions.

The welded steel pipe chamfering machine table for the crawler crane tower comprises an L-shaped frame, an air cylinder is fixedly connected to the end wall of the top of the frame, and a fixing base is in transmission connection to the lower end wall of the air cylinder. The welded steel pipe chamfering machine table for the crawler crane tower has the beneficial effects that during chamfering, the liquid base is assembled and connected to the side wall of the fixing base through the positioning screws, the liquid base is convenient to disassemble and assemble, a liquid conveying pipeline is connected to a liquid pipe opening of the liquid base, liquid is poured into an inner cavity of the liquid base and then sprayed out through a spraying hole in the end wall of the right side of a penetrating opening of the liquid base, and therefore chamfering is achieved. The end wall of the right side of the penetrating opening is inclined, spraying holes formed in the end wall of the right side of the penetrating opening are inclined and annularly distributed in a round hole in the right side of the penetrating opening, the spraying holes spray liquid, the liquid is poured to the chamfering tool bit from the chamfering tool bit by 360 degrees, and the chamfering tool bit is protected; the chamfering tool bit is protected in all directions without dead angles, and the cooling effect of the chamfering tool bit is improved.

The utility model discloses a device for processing high interchangeability support type parts, which comprises a rotary body, an adjustable positioning groove, a positioning screw, a pressing plate and a clamping bolt, one end of the rotary body is connected with a rotary dividing head of processing equipment, and the other end of the rotary body is used for clamping and positioning the parts; the positioning screw is connected with the rotary body through the adjustable positioning groove and is used for aligning and locking the part; the clamping bolts penetrate through the pressing plates to be connected with the bolt holes in the two sides of the rotary body and used for pressing the support parts. According to the device disclosed by the utility model, a part can be quickly positioned and clamped on the device, so that a conventional three-axis machining method is changed along with the rotation characteristic of the whole device, and the part can be operated and machined on equipment or a dividing head with rotation machining capability. By means of the device, accumulative errors of high-interchangeability support parts in the machining process can be reduced, the size precision, consistency and interchangeability of batch parts are improved, the technological process is shortened, and the production efficiency is improved.

The present invention discloses a three-speed MOA adjustment structure with zero adjustment and locking functions, which relates to the technical field of sights. The present invention includes a handwheel seat, an adjustment handwheel, a sealing pressure ring, a gear shaft, an adjustment screw, an adjustment pin, a sealing pressure ring and a set screw; the adjustment screw is located inside the handwheel seat, the adjustment screw is threadedly connected to the handwheel seat, the lower end of the adjustment screw is provided with an adjustment pin, the lower end of the gear shaft is placed on the inner side of the handwheel seat, a square hole is provided inside the gear shaft, and the upper end of the adjustment screw is set to a square shape. The present invention adopts a multi-structure coordinated design to ensure that the quality of the device is stable and reliable, the operation is convenient and smooth, and it is convenient for users to calibrate the gun and debug during daily use, which greatly saves the user's time. The three-speed MOA adjustment structure with zero adjustment and locking functions fills the gap in the international market, solves many shortcomings in existing product structures, and has a very broad prospect.

This invention relates to a tightening and reinforcing assembly and installation method for existing curtain wall decorative strips. The assembly includes a reinforcing plate, a set screw, and a self-locking nut. The set screw is connected to the keel; the set screw is fixedly connected to the reinforcing plate; the self-locking nut is fixedly connected to the set screw; both ends of the reinforcing plate abut against the profile wall of the keel; and the reinforcing plate abuts against two opposing existing curtain wall decorative strips. During installation, the reinforcing plate is installed between the gaps of the two opposing existing curtain wall decorative strips. After the set screw is rotated and tightened against the keel wall, the reinforcing plate presses against the existing curtain wall decorative strip. The self-locking nut is then installed for reinforcement. Compared with the prior art, the tightening and reinforcing assembly of this invention does not require disassembly of the original decorative strips, does not disturb the existing curtain wall, and can effectively reinforce the existing curtain wall decorative strips. Furthermore, during later maintenance, only the set screw and self-locking nut need to be tightened, making the operation simple and maintenance convenient.

The utility model relates to a portable circular die replacing structure for a handheld die head threading machine. The split type die is characterized in that the split type die comprises a circular die, a lining set screw, a lining, a split type die head and a die head set screw, a lining positioning hole is formed in the wall face of the circular die, a lining positioning through hole and a die head positioning hole are formed in the wall face of the lining, the circular die is sleeved with the lining, and the die head set screw is arranged on the lining. The bushing set screws are fixed in the bushing positioning through holes and the bushing positioning holes; the split type threading die head comprises a connecting sleeve and a connecting base used for being fixed to the handheld electric threading machine, the connecting sleeve is fixed to the connecting base, a threading die head positioning through hole matched with the threading die head positioning hole is formed in the wall face of the connecting sleeve, the lining is arranged in the connecting sleeve of the split type threading die head in a sleeved mode, and the lining is arranged on the connecting base. And the threading die head set screw is fixed in the threading die head positioning through hole and the threading die head positioning hole. The device is reasonable in structural design and convenient to disassemble and assemble.