8results about How to "Achieve circumferential limit" patented technology

This utility model relates to the field of building construction technology, specifically a formwork fastening device for building construction, comprising: a tie rod, wherein at least two guide grooves are spaced apart circumferentially on the outer wall of the tie rod; two clamps, each clamp being movably fitted onto the tie rod, and each clamp having a guide protrusion corresponding to each guide groove; and an adjustment mechanism connected to the corresponding guide protrusion on each clamp. This utility model forms a cooperative limiting structure by providing guide grooves on the tie rod, corresponding guide protrusions on the clamps, and an adjustment mechanism driving their movement. During installation, the adjustment mechanism drives the guide protrusions to maintain a gap with the guide grooves, facilitating clamp fitting and achieving circumferential limiting through their cooperation. During locking, the adjustment mechanism drives the guide protrusions to embed into the guide grooves and fit tightly, using this adjustment to achieve axial limiting of the clamps while simultaneously enhancing the circumferential anti-rotation effect.

The utility model provides a clothes rail and a wardrobe, which comprise a hanging rod, swing arms connected to two longitudinal ends of the hanging rod, a rotating body connected to the swing arms and a rotating seat arranged on a top plate of a wardrobe body, and the rotating seat is suitable for supporting the rotating body so as to rotatably install the hanging rod in the wardrobe body. One of the rotating seat and the rotating body comprises a limiting convex tooth, the other one of the rotating seat and the rotating body comprises at least one limiting groove, the limiting convex tooth is clamped into the limiting groove to realize circumferential limiting between the rotating seat and the rotating body, and when the limiting convex tooth is clamped into at least one limiting groove, the swing arm is parallel to the top plate. Through the cooperation of the swing arm, the rotating body and the rotating seat, the clothes rail can be quickly and reliably switched between a storage state and a use state, and the space utilization rate is improved.

This invention provides a one-way valve with a bidirectional limiting integral dual-valve-core structure to solve the technical problem that existing technologies have complex overall structures and long dimensions, making them difficult to adapt to large vibration dynamic environments. The invention includes a housing, a dual-valve-core assembly, a first elastic element, and a base. The dual-valve-core assembly includes a first valve core, a second valve core, and a second elastic element. The first valve core includes a first circular baffle, a first sealing ring, a first connecting post, and a valve core cylinder that slides with the base. The second valve core includes a second circular baffle, a second sealing ring, and a second connecting post. The first and second sealing rings form a first sealing structure and a second sealing structure with the housing, respectively. The second connecting post is fitted inside the first connecting post. The first elastic element is fitted outside the valve core cylinder and abuts against the first circular baffle and the base. The second elastic element is fitted outside the first connecting post and abuts against the second circular baffle and the first circular baffle. The first sealing ring has a locking groove for fitting the second sealing ring.

The invention discloses natural gas pipeline auxiliary transportation equipment which comprises a frame, the frame is in a frame shape, a supporting piece is fixedly connected to the middle of the upper side of the frame, a limiting part and a lower supporting part are arranged at the two ends of the supporting piece correspondingly, and the limiting part can automatically embrace to conduct circumferential limiting on a pipe fitting under the pressure of the pipe fitting; the invention belongs to the technical field of auxiliary transportation equipment for natural gas pipelines, and particularly relates to auxiliary transportation equipment for natural gas pipelines, which can realize automatic cohesion and circumferential limiting of pipe fittings through the matched design of a supporting piece, a limiting part and a lower supporting part, does not need additional manual operation, and is convenient to use. The problem that the pipeline is not stably fixed in the transportation process is solved.

The utility model relates to the technical field of steering wheel testing devices, in particular to a steering wheel vibration testing device which comprises a sensor, a rubber pad is fixed to the bottom end of a base, the other end of the rubber pad abuts against the surface of a steering wheel, a plurality of sets of anti-loosening grooves are formed in the surface of a nut, and an anti-loosening rod mounting groove is formed in the surface of the base. One end of a first anti-loosening rod is movably inserted into the anti-loosening rod mounting groove, a second anti-loosening rod is fixed to the other end of the first anti-loosening rod, and the second anti-loosening rod is movably inserted into one set of anti-loosening grooves; the anti-loosening device has the beneficial effects that when the nut is screwed to enable the rubber pad to be tightly attached to the surface of the steering wheel and one set of anti-loosening grooves are aligned with the second anti-loosening rod, the second anti-loosening rod extends out of the anti-loosening rod mounting groove and is inserted into the aligned anti-loosening groove, the first anti-loosening rod stays in the anti-loosening rod mounting groove, circumferential limiting of the nut is achieved, and the anti-loosening effect is good. The nut and the locking rod cannot rotate relative to each other, and thread looseness prevention between the locking rod and the nut is achieved.

The utility model discloses a circuit breaker pressure spring pin pressing and riveting tool, and belongs to the technical field of electrical equipment manufacturing, the circuit breaker pressure spring pin pressing and riveting tool comprises a rack, a positioning assembly, a limiting assembly and a pressing and riveting assembly, the positioning assembly is installed on one side of the rack, and a positioning groove is formed in the positioning assembly; the limiting assembly is arranged opposite to the positioning assembly and used for clamping and driving the insulation pull rod to move in the direction close to or away from the rivet pressing assembly, and the rivet pressing assembly is used for riveting the edge of the pressure spring pin. The positioning assembly, the limiting assembly and the press riveting assembly are used in cooperation, automatic and accurate riveting of the pressure spring pin can be achieved, the riveting efficiency of the pressure spring pin is improved, the consistency of the knocking angle and position of the pressure spring pin is guaranteed, the situation that the center of the pressure spring pin is expanded due to stress, and use is affected is effectively avoided, and the production efficiency is improved. The action reliability and the operation stability of opening and closing of the circuit breaker are improved; according to the utility model, the qualified rate of opening and closing parameters of the circuit breaker can be effectively improved, batch reworking is reduced, and the production efficiency is improved.

The utility model relates to the technical field of silicon core cutting, in particular to a gap bridge wheel, a gap bridge wheel assembly and a silicon core cutting mechanism, the gap bridge wheel comprises a main shaft, at least two driven wheels, a rolling bearing, a fixed support and a mounting sleeve, the driven wheels are rotatably connected with the main shaft through the rolling bearing, and the fixed support comprises a main shaft mounting part. A non-circular mounting hole is formed in the main shaft mounting part; the matching surface of the mounting sleeve is in interference fit with the main shaft, a first mounting part and a second mounting part are arranged on the mounting surface of the mounting sleeve, the first mounting part abuts against the rolling bearing or the driven wheel, and the second mounting part is matched with the non-circular mounting hole. According to the gap bridge wheel, the fixing support and the mounting sleeve are matched with the rolling bearing or the driven wheel to achieve circumferential limiting and axial limiting of the main shaft and axial limiting of the driven wheel, the situation that the main shaft is driven to move when the driven wheel in the gap bridge wheel rotates can be avoided, stable work of the gap bridge wheel is guaranteed, and meanwhile the service life of the main shaft is prolonged. Connecting pieces between the driven wheel and the main shaft are simplified, and the production cost is reduced.

The utility model provides a fixed iron core of an electromagnetic relay, which comprises a fixed iron core body, a shaft hole is coaxially arranged in the middle of the fixed iron core body, a connecting shaft passes through the shaft hole, and the upper end of the connecting shaft is fixed with a movable iron core; an annular convex edge is arranged on the peripheral wall of the lower part of the fixed iron core body and is used for abutting against the upper end surface of a base in the relay; an annular boss is coaxially arranged on the lower end face of the fixed iron core body, the annular boss is arranged in an assembling hole in the base in a penetrating mode from top to bottom, and the annular boss is tightly attached to the hole wall of the assembling hole. A plurality of opening grooves are formed in the lower end of the annular boss in the circumferential direction of the annular boss, and riveting blocks are formed in the positions, between every two adjacent opening grooves, of the annular boss; after the riveting block is riveted by the riveting tool, the riveting block expands outwards and abuts against the lower end face of the base in the relay. According to the utility model, the fixing reliability of the fixed iron core body and the base can be improved.