31results about How to "Guaranteed parallel" patented technology

The utility model discloses a cable support with adjust cable length structure, length adjusting mechanism includes movable plate, and one side upper end and lower end of movable plate all are fixedly connected with guide rod, and guide rod with movable plate is perpendicular to each other in length direction, the bottom surface of guide rod is equipped with a plurality of resistance groove, and every resistance groove all equidistance arrangement along the length direction of guide rod, the outside of guide rod is slid and is sleeved with horizontal support, the bottom surface of horizontal support is close to the side of movable plate and is equipped with the mouth of passing, the top surface of horizontal support is away from the side of movable plate and is fixedly connected with stop projection, the side of movable plate is equipped with push groove, and push groove is consistent with movable plate in length direction, when horizontal support is fixed in the inside of cable well, through moving horizontal support, can support cable in the alignment position of cable pipe, avoid the cable after being straight and bending, in addition to reduce the length requirement of cable, also reduced the construction difficulty.

This utility model belongs to the field of chemical experimental technology and discloses a safe management storage cabinet, including a cabinet device for independently placing chemical reagents. The cabinet device is equipped with a moving device for positioning and a retrieval device for inserting and placing chemical reagents. The cabinet device includes a cabinet body, with an access component at the front for improved safety and individual access to chemical reagents. Several storage slots are evenly distributed on the rear wall of the cabinet body, and reagent racks are placed in the storage slots. The moving device includes a moving frame. The retrieval device includes a selection component for reciprocating movement, with a swing motor installed on the selection component, and an insertion / removal bracket installed at the output end of the swing motor. This utility model's safe management storage cabinet, by independently placing chemical reagents and allowing unified access through the access window, reduces the risk of frequent opening and closing of the cabinet door, improving the safe storage of chemicals such as explosives, highly toxic substances, or volatile chemicals.

The pipe joint comprises an upper portion, a middle portion and a lower portion, and the upper portion, the middle portion and the lower portion jointly form a through circulation channel. An annular insertion block is arranged on the top face of the upper portion, a circle of platform is arranged on the periphery of the annular insertion block, a sunken solder groove is formed in the side, close to the annular insertion block, of the surface of the platform, and dual positioning of the annular insertion block and the platform facilitates reduction of welding alignment errors. A plurality of through screw holes are formed in the lower part; the outer diameter of the cylindrical structure where the first vertical face is located is larger than the outer diameter of the middle portion and smaller than the outer diameter of the lower portion, the middle portion is concave inwards relative to the upper portion and the lower portion, and the concave structure of the middle portion serves as a thermal expansion buffer area and is matched with smooth transition of the first inclined face, so that the welding thermal stress concentration coefficient can be effectively reduced, thermal deformation is reduced, and the welding seam cracking rate is reduced. According to the pipe joint for the plate heat exchanger, through the stepped axial structure, a multi-stage positioning reference and stress dispersion system is formed, and the comprehensive performance of the pipe joint can be remarkably improved.

The utility model belongs to the technical field of vehicles, and particularly relates to a damping connecting support and a wheelbarrow, the damping connecting support comprises a frame, a wheel, connecting rod assemblies and elastic assemblies, and the connecting rod assemblies are arranged on the two sides of the wheel; the connecting rod assembly comprises a first connecting rod module and a second connecting rod module, the upper end of the first connecting rod module is rotationally hinged to the frame, the lower end of the first connecting rod module is rotationally hinged to the upper end of the second connecting rod module through a connecting component, and the lower end of the second connecting rod module is hinged to the axis of the wheel; the first connecting rod module and the second connecting rod module are connected with a frame and wheels through the first connecting rod module and the second connecting rod module, and vibration energy is fully absorbed and dispersed through the elastic assembly. The vehicle frame is prevented from inclining forwards or backwards in the damping process when the vehicle deals with complex road conditions and large impact, the height of the vehicle frame is reduced, and the gravity center of the vehicle is lower.

A special tool suitable for press fitting of a universal bearing is provided with a positioning pull rod, a left punch, a right punch and a special-shaped nut. The positioning pull rod comprises a hexagonal head part, a polished rod part and a threaded part; the left punch and the right punch are both of a sleeve structure, a plurality of boss punching points are arranged on the opposite end faces of the left punch and the right punch, the boss punching points are evenly arranged in the circumferential direction of the end faces of the left punch and the right punch, and the boss punching points can be inserted into grooves formed in an aircraft body around a bearing assembly hole. When the special tool works, the left punch, the right punch and the inner ring of the universal bearing are sleeved outside the polish rod part of the positioning pull rod in a clearance fit manner, the left punch and the right punch are positioned on two sides of the universal bearing, the special-shaped nut is assembled with the thread part of the positioning pull rod, and the outer side wall of the special-shaped nut is connected with the right punch. According to the utility model, the positioning pull rod, the double-side multi-point punch and the special-shaped nut are matched, so that the double sides of the outer ring of the bearing are simultaneously pressed and fastened, and the purpose of ensuring the assembly precision of the universal bearing is achieved.

The utility model discloses a threaded fastener bending device which comprises a box body, a limiting plate and a driving mechanism, a groove is formed in the top of the box body, a rotating disc is rotatably arranged in the groove, a limiting column is arranged at the top of the rotating disc, a baffle is movably arranged at the top of the rotating disc, and a fixing seat is fixedly arranged at the top of the box body. The limiting plate is movably arranged on the side, close to the limiting column, of the fixing base, a sliding groove is formed in the side, close to the limiting column, of the fixing base, a first screw is rotationally arranged in the sliding groove, a cross rod is slidably embedded in the sliding groove, one end of the cross rod is sleeved with the first screw in a matched mode, the other end of the cross rod is fixedly connected with the limiting plate, and the driving mechanism is arranged in the box body. Through the arrangement, it can be ensured that the other side of the threaded fastener can be attached to the limiting plate when one side of the threaded fastener makes contact with the limiting column, and the bending accuracy of the threaded fastener is improved.

The utility model relates to a door lock which comprises a bolt, a first lock body and a second lock body, the first lock body and the second lock body are arranged in parallel, the bolt comprises a bolt body, an opening of the bolt body faces downwards, and the two ends of the bolt body are parallel and are arranged in the first lock body and the second lock body respectively. One end of the bolt body penetrates through the first lock body and then extends downwards by a preset distance, a limiting structure is formed at the end, and the limiting structure is used for limiting one end of the bolt body to be separated from the first lock body. The door lock is simple in structure and convenient to install and use, can be used for temporarily locking a door, can achieve the purpose of locking and opening the door only by guaranteeing that the first lock body and the second lock body are parallel and the bolt body can be downwards inserted into the first lock body and the second lock body when being applied to a door frame (double door) with various angles or uneven, is more applicable than an existing door lock, and is convenient to use. The device can be applied to left-right opening doors, up-down opening doors, sliding doors, uneven doors, 90-degree doors and the like.

The invention discloses a wing overhaul stand for aircraft maintenance, and belongs to the technical field of wing overhaul equipment, the wing overhaul stand comprises a mobile overhaul stand, an automatic lifting device, a wing attaching structure and a nondestructive testing structure, the automatic lifting device is clamped on the mobile overhaul stand, and the wing attaching structure is arranged on the automatic lifting device; the wing attaching structure rises along with rising of the automatic lifting device, and the nondestructive testing structure is arranged on the wing attaching structure. The invention provides a wing overhaul stand for aircraft maintenance in order to solve the problems that current wing overhaul equipment is low in automation degree and high in dependency on detection personnel, and detection equipment is prone to damaging a wing surface coating. The problems that traditional wing maintenance equipment is low in automation level, insufficient in positioning precision and single in detection function, and wing surface coatings are prone to being damaged are effectively solved.

This application provides a method for processing an optical component with a light-reflecting cavity, comprising the steps of: processing a first coated component and a second coated component; processing two plates having the same reference surface on the same disc, positioning them using the reference surface, and processing the two plates respectively to obtain a third coated component and a fourth coated component; providing an assembly fixture to position the first coated component and the third coated component, fixing the bottom surface of the third coated component to the surface of the first coated component; positioning the second coated component using the assembly fixture, and bonding the surface of the second coated component to the third coated component and the fourth coated component. This method solves the problem that the processing of optical components in the prior art is difficult to achieve high-standard quality requirements.

This utility model discloses a fastener for an integrated exterior wall insulation and decoration panel, including a panel for abutting and fixing to the side wall of an exterior wall; and an I-beam for supporting an insulation block, the insulation block comprising an insulation layer and a fabric layer. The upper and lower sides of the I-beam have slots for engaging and supporting the fabric layer. A central crossbeam of the I-beam extends towards the panel to form a support plate for supporting the insulation layer. The panel has a support portion corresponding to the support plate for installing the support plate and allowing the support plate to slide. A drive component is also included for moving the I-beam towards the panel. When installing the upper insulation block, the I-beam is also installed on the upper side of the insulation block. First, the panel is installed and fixed to the wall, then the I-beam is installed. The slots of the I-beam engage the fabric layer. Then, the drive component is used to drive the I-beam, and the distance between the fabric layer and the wall is manually adjusted. When local gaps appear, they are finally filled with mortar to ensure that there are no large angle errors during installation.

This invention discloses a new energy-driven intelligent supply chain transportation system, relating to the field of intelligent supply chain transportation technology. It includes a guide drive rail with a three-dimensional mobile vehicle mounted at its bottom. A horizontal drive ring is mounted on the outer side of the three-dimensional mobile vehicle, and an isolation magnetic ring is installed on the outside of the horizontal drive ring. This invention utilizes driving clamping rollers in conjunction with the guide drive rail for suspended transportation, effectively expanding the transportation methods of the supply chain transportation system. It fully utilizes the upper space of the supply chain transportation system, improving the overall space utilization rate. It enables long-distance, rapid transportation using the upper space of the supply chain transportation system. The position of the three-dimensional mobile vehicle on the ground can be automatically fine-tuned via drive rollers, improving the automation level of the supply chain transportation system and effectively enhancing the smoothness of transportation.

The present application relates to the technical field of steel metallurgy, and particularly relates to a kind of installation auxiliary device and installation calibration method of circular cooling machine supporting roller, including roller body installation auxiliary device, the roller body installation auxiliary device includes: base, wing plate, wherein, left and right sides of wing plate front end face are respectively machined into sink pad, so as to form sink pad surface on wing plate, and horizontal edge line and longitudinal edge line are formed on the outer edge of sink pad;The present application designs symmetrical wing plate and sink pad structure, avoids the line-of-sight obstacle of inner ring column from the center total station instrument of circular cooling machine, directly observes the symmetrical sink pad of auxiliary device, can make indirect observation of multiple measurement reference conversion into direct visual observation, make certain undetectable item measurable, can directly measure a circle from center measurement table ring, measure all supporting rollers at one time, detection is intuitive and convenient, detection efficiency is greatly improved, and higher reliability and accuracy can be guaranteed.

The application discloses a high-uniformity OPA chip end face polishing machine and relates to the technical field of chip end face polishing. The upper cover plate is fixedly provided with a polishing motor, the output shaft of the polishing motor is fixedly provided with a mounting seat, the mounting seat is fixedly provided with an adjusting micro-cylinder mounting disc, and the adjusting micro-cylinder mounting disc is fixedly provided with a plurality of adjusting micro-cylinders which are equidistantly distributed. The application can quickly detect the flatness of the polishing disc before polishing the chip each time, so that the parallelism between the polishing sandpaper and the chip end face is guaranteed. The closed-loop feedback mechanism can detect and adjust the pressure applied to the polishing disc by all the adjusting micro-cylinders in real time, so that the force applied to the chip end face by the polishing disc is uniform. The application can effectively improve the uniformity of the polished end face and obtain better surface quality and performance.

The invention relates to the technical field of metal plate machining, in particular to a feeding rotary pressing arm device for metal plate machining, which comprises a mounting frame, a moving groove is arranged in the middle of the upper end face of the mounting frame, first sliding rails are fixedly connected to two sides of the upper end face of the moving groove, and a base is slidably connected to the moving groove through the first sliding rails. And a plurality of connecting pieces are distributed and fixed to the two sides of the mounting frame at equal intervals, and a moving mechanism for driving the base to move is arranged in the moving groove. Through the hinged design of the supporting shaft between the main pressing arm and the base and the first air cylinder, the first air cylinder drives the main pressing arm to deflect, so that the pressing mechanism and the rotating mechanism are distributed in a staggered mode, in this way, a raw material plate can be directly and vertically placed over the rotating mechanism through the mechanical arm, transfer is not needed, the process is simplified, the feeding time is greatly shortened, and inclination of the raw material plate is avoided; the bending machine improves machining efficiency and is particularly suitable for the bending process of frequent feeding. As shown in Figure 1, the overall structure of the device shows the deflection mechanism of the main pressing arm.

This invention discloses a battery pack replacement system for new energy vehicles, relating to the field of new energy vehicle technology. It addresses the problem that existing battery swapping equipment for new energy vehicles lacks compatibility and cannot swap batteries for different vehicle models. The battery pack replacement system of this invention includes a traveling unit, a lifting unit, a lifting platform, and a disassembly / assembly unit. The disassembly / assembly unit is connected to the lifting platform, the lifting platform is connected to the lifting unit, and the lifting unit is connected to the traveling unit. This battery pack replacement system improves the practicality and compatibility of existing battery pack replacement systems, enabling vehicle owners to perform battery swapping operations without having to visit specific battery swapping stations, thus providing convenience for new energy vehicle owners.

The utility model discloses a novel separating type lens pressing base. The base comprises a base body, one side face of the base body is provided with a connecting part, the top of the connecting part is provided with a plane, and the plane is parallel to the datum plane of the pressing machine table. The upper sleeve is connected to the top of the connecting part in a sleeving mode, and the contact face of the upper sleeve and the connecting part is parallel to the plane; the contact surface is provided with a hollow part, and the hollow part is used for fixing the mirror frame, so that the image side of the mirror frame abuts against the plane. The novel separating type lens pressing base is composed of a base body and an upper sleeve, and aims to solve the limitation of a traditional integrated all-metal base in the aspects of compatibility, flatness control, processing difficulty and the like.

The invention belongs to the technical field of building construction equipment, and particularly provides a building construction lifting platform which comprises a supporting assembly, a cage and a walking assembly, the supporting assembly fixes a guide rail frame to a building outer wall through a wall-attached support, and the walking assembly drives the cage to move along the guide rail frame. In order to adapt to an inclined building outer wall, the stand columns of the lifting cage are hinged to the upper frame body and the lower frame body and connected between the upper frame body and the lower frame body through the telescopic connecting rod units, the first side face of the lifting cage is a deformable parallelogram, and the inclination angle of the second side face can be adaptively adjusted so as to adapt to the building outer wall; and the second side surface for people to enter and exit is parallel to the building outer wall. And after adjustment is completed, the relative positions of the upper frame body and the lower frame body are locked through the connecting rod unit, so that the suspension cage forms a stable rigid frame structure. The inclination angle of the second side face can be flexibly adjusted according to needs, and compared with conventional customized production, repeated use is facilitated, and cost is saved.

This invention provides a medical waste sorting and collection garbage truck for operating rooms. Its structure includes: a sealed top cover, a sorting loading box, a load-bearing plate, pulleys, and a push rod. The invention further improves upon the sorting loading box by using adsorption blocks and protrusions on the bottom plate of the box to enhance the verticality of the connection with the load-bearing plate. This allows the guide plate of the guide structure to be inserted linearly into the output slot on the side of the box, followed by assembly using assembly blocks. Simultaneously, a restraining plate is inserted into the inner wall of the loading slot to limit its movement. Finally, when retrieving waste, it is directly pushed towards the output slot, allowing the waste to move through the guide plate to the inclined plate position, and finally output to the flat plate position. This achieves rapid waste retrieval, replacing the original disassembly and inverting process. Therefore, it improves the efficiency of the garbage truck in retrieving different types of medical waste and increases its own operational strength.

This invention relates to the field of end-effector positioning technology for substation switchgear operating robots, specifically a deep learning-based end-effector positioning method for substation switchgear operating robots. The method includes an end-effector recognition algorithm, input task parameters, vehicle position adjustment, end-effector posture adjustment, and target positioning. Compared with existing technologies, this invention improves the accuracy of image matching algorithms by using a SuperPoint+ASIFT combined matching algorithm, eliminates interference from deviations between the target plane and the robot arm's end-effector posture using a point cloud depth map leveling algorithm, and extracts the position and angle of the target on the image to be recognized to meet positioning accuracy requirements. This improves the accuracy of end-effector positioning, enhances the safety operation factor, ensures the stability of power supply from power grid companies to society, and guarantees the safety of the power grid and its equipment.

The application discloses a kind of building external corner construction devices, it includes track, sliding rod, corner guard scraping flat plate, groove, handle, push plate, transmission mechanism;Track is connected with building floor, building roof respectively;Sliding rod can slide along track;Sliding rod is connected with corner guard scraping flat plate;Corner guard scraping flat plate forms the angle equal to the angle of external corner;Groove forms mortar groove, it includes bottom plate, 2 side plates, back plate, front plate, is provided with opening in front plate;Corner guard scraping flat plate is arranged at opening, is connected with bottom plate;The height of corner guard scraping flat plate is lower than the height of front plate;Handle is installed on groove;Push plate is placed in mortar groove;Transmission mechanism is installed on groove, it is connected with push plate;Transmission mechanism drives push plate to move, so that mortar in mortar groove flows into the external corner formed by corner guard scraping flat plate from opening.The application further discloses a kind of building external corner construction method.The application can improve the efficiency of external corner construction, and can guarantee construction quality.

The utility model discloses a kind of arc prevention isolation baffle of ring net cabinet low voltage box, it is related to ring net cabinet technical field, including circuit breaker body, the both sides of circuit breaker body are provided with arc separation plate, connecting assembly is arranged between the one side of circuit breaker body and arc separation plate, and connecting assembly is used to fix arc separation plate;Connecting assembly includes fixed casing, and fixed casing equidistant fixed connection is in the one side of circuit breaker body, fixed groove is set in the inside of fixed casing, connecting groove is set in the one side of fixed groove inner wall, the one side fixed connection of arc separation plate has connecting plate, the one side fixed connection of connecting plate has fixed plate, and the inside of fixed groove is slidably connected with the outside of fixed plate.The utility model discloses a kind of arc prevention isolation baffle of ring net cabinet low voltage box, by using connecting assembly and semicircular block and limit frame etc. structure, ensure that arc separation plate can be closely combined and keep parallel state after assembly is completed, to effectively enhance the stability of assembly and overall reliability.

This utility model relates to the field of impact test specimen notch projector technology, and discloses an auxiliary platform for a forging impact notch projector, including a projection device and an adjustment bracket. The adjustment bracket is fixedly connected to the inner side of the projection device, and the adjustment bracket can adjust the position of the specimen back and forth and left and right. A positioning component is fixedly connected to one side of the adjustment bracket. The positioning component includes a support frame, a screw, and a positioning frame. The positioning frame is sleeved on the outer side of one end of the screw, and a standard specimen is inserted into the inner side of the positioning frame. The positioning frame can make the standard specimen parallel to the horizontal calibration line of the projector. After the standard specimen is inserted into the inner side of the positioning frame, the standard specimen is squeezed and fixed to the guide plate by a movable guide plate, ensuring that the standard specimen is always parallel to the calibration line, avoiding angular deviations when manually placed, thereby improving the accuracy of notch size comparison, and eliminating the need for repeated manual fine-tuning, thus improving detection efficiency.

The utility model relates to robot technical field, and disclose a caterpillar robot with clamping mechanism, this caterpillar robot with clamping mechanism, including the frame, the fixed mounting of frame has the mounting bracket, the fixed mounting of mounting bracket has clamping subassembly, clamping subassembly includes support rod. This caterpillar robot with clamping mechanism, in order to make the device make robot can be in complex terrain flexible capture irregular object, by setting clamping subassembly, this component cooperation no.

This utility model relates to the field of mold opening and closing technology, specifically to an adaptive mold opening and closing device for mold thickness. It includes a lifting drive mechanism, a flipping drive mechanism, and a flipping plate. The flipping drive mechanism is mounted on a mold station frame. The flipping plate is connected to the flipping drive mechanism and located on one side of the mold station frame. The lifting drive mechanism is mounted on the flipping plate, and the upper mold is connected to the lifting drive mechanism, with the upper mold and the flipping plate arranged parallel to each other. The lifting drive mechanism drives the upper mold to move closer to or away from the flipping plate. The lower mold is located on one side of the mold station frame. In the closed state, the upper mold and the lower mold are parallel. In the open state, the flipping drive mechanism drives the flipping plate, causing the lifting drive mechanism and the upper mold to flip relative to the lower mold, so that the upper mold and the lower mold are arranged at an angle. Using the mold opening and closing device proposed in this application, molds of different thicknesses can be opened and closed, solving the problem of adapting the mold opening and closing device to molds of specific thicknesses.

The utility model provides a quick-mounting clamp for a grey cast iron piece of a machining center. The quick-mounting clamp effectively solves the problems that in the end rough machining process of an existing cylindrical casting piece, the clamping mode is tedious, excessive cutting is prone to occurring, and the parallelism of the end faces of the two ends is not enough. According to the technical scheme, the device comprises a base, a plurality of V-shaped clamping plates are arranged on the upper side of the base, the clamping plates are vertical and are provided with inward openings, a sliding rod is arranged on the outer side of each clamping plate, the sliding rods are sleeved with fixing cylinders, and the fixing cylinders are fixed to the base through vertical rods; two rectangular frames are arranged on the upper side of the base, the two rectangular frames are connected through a plurality of air cylinders, connecting rods in one-to-one correspondence with the rectangular frames are hinged to the clamping plates, and the ends, away from the clamping plates, of the connecting rods are hinged to the rectangular frames; the clamp is ingenious in structure, does not need to be manually straightened before being used, can set the milling amount according to requirements, guarantees the axial size of a part, and meanwhile can guarantee that the end faces of the two ends are parallel.

This utility model discloses a multifunctional stainless steel wall-mounted cabinet, belonging to the technical field of wall-mounted cabinets. Its key technical features include a stainless steel cabinet body, a mounting plate on the rear side of the cabinet body, stainless steel cabinet doors on both sides of the front side of the cabinet body, a moving mechanism on the front side of the mounting plate, and four sealed storage mechanisms inside the stainless steel cabinet body. The moving mechanism includes a sliding groove, a slider, several limiting holes, and limiting pins. This solves the problem in existing patents where wall-mounted cabinets require precise measurement and positioning of the fixing plate and base during installation to ensure they are perfectly parallel, facilitating the subsequent attachment of the movable hanging plate to the fixing plate while allowing the base to slide within the second sliding groove. Precise measurement in these cases consumes considerable time, affecting installation efficiency, and the cabinet's functionality is relatively limited.

The invention relates to the technical field of riding type baby carriages, and discloses a baby walker convenient to adjust joint control, the baby walker comprises an upper disc and a ground disc, and further comprises an upper joint assembly and a lower joint assembly, the upper joint assembly comprises a first shell and a second shell which are rotatably installed on the two sides of the upper disc, a rotating disc and a spring bolt ring are installed on the inner side of the first shell and the inner side of the second shell correspondingly, and a spring bolt body is fixedly installed on the side surface of the spring bolt ring. According to the baby walker convenient to adjust the joint control, through the arranged upper joint assembly, the arranged lower joint assembly and the unique parallelogram connecting rod structure, it is ensured that the upper disc is always kept parallel to the ground disc in the lifting and folding process, inclination or shaking is effectively avoided, and compared with a traditional baby walker, the upper disc is prone to inclination when folded, and the folding efficiency is improved. The baby walker is safer and more reliable, the stability and safety of the baby walker are greatly improved, meanwhile, the adjusting operation is simplified, and the practicability of the product and the user experience are enhanced.

The utility model relates to the technical field of pavement construction discloses a kind of cutting joint devices for asphalt concrete pavement construction, including fixed plate, two sides corresponding arrangement of extension column are equipped on the fixed plate, limit plate is slidably equipped on the extension column, fixed mechanism is equipped on the limit plate and cooperates with cutting joint device, the utility model compared with prior art is advantageous in when cutting a seam needs to turn, mobile wheel on shell is moved down by air cylinder drive, so that mobile wheel contacts ground and cutting joint device is lifted, then cutting joint device is moved to next place by being pushed, by setting rotatable support plate, so that the direction of cutting joint device is conveniently adjusted, it is easy to operate, improve cutting efficiency.

The utility model relates to the technical field of flange installation auxiliary equipment, in particular to a neck socket welding flange limiting device which comprises a base, a telescopic assembly is horizontally arranged in the center of the top of the base, the outer side of the telescopic assembly is detachably connected with a plurality of centrosymmetric limiting rods, the limiting rods are vertically arranged, and the limiting rods are detachably connected with the telescopic assembly. The telescopic assembly can drive the limiting rod to slide synchronously, the upper end of the limiting rod is rotationally connected with a limiting piece, and the height of the limiting piece is adjustable. The limiting rods can be controlled to slide synchronously by arranging the telescopic assemblies, and the device can adapt to neck socket welding flanges with different inner diameters; the limiting piece can be erected at the top end of the flange ring step, the distance between the pipeline and the flange ring step can be limited, it is guaranteed that the insertion depth of the pipeline is consistent, and the connecting effect between the pipeline and the neck socket welding flange is guaranteed.