536 results about "Point contact" patented technology

The invention discloses a tooth-shaped structure of a bolt fixing tool. The tooth-shaped structure comprises a drive part, a looping part is concavely arranged inside the drive part; the inner periphery of the looping part is a hollow structure and is approximately a polygonal structure, the intersectional angle between edges of the polygonal structure of the looping part are respectively provided with an escape groove, the escape groove is a recessed arc structure, an opening of the escape groove and an opening of the adjacent escape groove take on a straight edge, the straight edge is a lank line section; a top surface is respectively arranged at the center of the straight edges between two adjacent escape grooves, the top surface is in a planar straight line section structure, the top surface is arranged at the straight edge between the two adjacent escape grooves and is superposed on the straight edge; a first groove and a second groove are respectively recessed between the escape groove and the top surface, the first groove is closer to the escape groove, the second groove is closer to the top surface, the first and the second grooves are arranged in line symmetry with another first and second grooves; based on the intermediate vertical line of the distance between the two side walls of the escape groove with the arc structure, the first and the second grooves are arranged in line symmetry with another first and second grooves by the central vertical line of the distance between the two side walls of the arc structure of the escape grooves. The tooth-shaped structure of a bolt fixation tool can not cause slipping and bruting of the bolt fixing part resulting from the stress concentration of point contact.

The invention relates to the technical field of machine tool profiling machining, and particularly discloses a positioning and locking adjustable clamp of a boring machine tool. The base and the positioning blocks capable of moving synchronously form a self-adaptive clamping frame, the synchronizing mechanism drives the positioning blocks to be close to or away from each other synchronously, and it is ensured that workpieces can be concentrically positioned under any size. The universal clamping mechanism on the mounting seat is adaptive to the surface curvature of the workpiece through multi-degree-of-freedom adjustment, and the stress uniform distribution mechanism at the clamping end of the universal clamping mechanism disperses local concentrated stress into continuous surface load, so that plastic deformation of the thin-walled workpiece due to point contact is avoided. And the stress sharing mechanism between the adjacent mounting seats further balances the cross-regional stress difference, so that the whole region of the workpiece is uniformly stressed, and the hole shape distortion caused by processing springback is inhibited.

The utility model discloses a ball mill lining plate for preparing superfine powder, which comprises a lining plate bottom plate, the top surface of the lining plate bottom plate is a grinding working surface, the lining plate bottom plate is provided with at least two grinding working surfaces, each grinding working surface is an involute arc-shaped curved surface, each grinding working surface is provided with a grinding medium lifting flow guide strip, and the grinding medium lifting flow guide strips are arranged on the lining plate bottom plate. Reinforcing ribs are embedded in the lining plate bottom plate, and positioning through grooves and positioning strips are arranged on the two side faces, arranged in the axial direction of the ball mill, of the lining plate bottom plate correspondingly. Materials on the grinding working face make full contact with grinding media, grinding is carried out by making full use of sliding friction between the grinding media and the grinding working face, the grinding media lift the flow guide strips to promote self-circulation of the grinding media and the materials, the contact face with the grinding media is changed into line contact from point contact, the grinding area is increased, and the grinding efficiency is improved. And a positioning strip, a positioning through groove, a positioning pin and a positioning circular groove are arranged, so that the lining plate bottom can be quickly and accurately positioned and spliced.

The present invention relates to the technical field of mechanical cutting, and specifically relates to a pipe welding beveling machine with an automatic positioning function, which includes a frame and a driving frame. A plurality of support arms are arranged between the driving frame and the frame. One end of the driving frame far from the frame is provided with a cutting assembly; by moving the driving frame along the axial direction of the pipe, the plurality of support arms are synchronously driven to expand radially along the pipe. After the plurality of support arms are in contact with the inner wall of the pipe, the frictional force generated by the multi-point contact cancels the cantilever load of the cutting assembly at the pipe port, so that the center of gravity of the beveling machine is stabilized inside the pipe. As the driving frame continues to move, the supporting force of the support arms on the pipe gradually increases, thereby compensating for the cutting force and vibration and improving the processing stability. Different from traditional beveling machines that rely on external fixtures or hoisting for fixation, this device can achieve automatic fixation by using a support arm structure with multi-point contact, is suitable for operation in narrow spaces, and improves the construction convenience.

The invention provides an optical element six-degree-of-freedom adjusting and clamping device and an assembling method, and relates to the technical field of optical instruments. The device comprises a supporting base, a ball head adjusting screw, a cantilever spring mechanism and an elastic opposite ejection mechanism. The bottom of the support base is provided with a triangular layout through hole group. The center of gravity of the optical element is in the triangle. The cantilever spring mechanism and the ball head adjusting screw are combined to control Z-axis displacement and rotation around the X / Y axis, and the elastic opposite ejection mechanism and the ball head adjusting screw are combined to control X / Y-axis translation and rotation around the Z axis. All contact interfaces adopt a spherical surface-plane point contact design, and tungsten steel or phosphor bronze is selected as a material. According to the invention, six-degree-of-freedom independent precision adjustment of the optical element can be realized, the error of a clamping surface is as low as 0.068 mu rad, the structure is compact, and the adaptability is high.

The invention discloses a metal forming punching device with a positioning structure and a using method thereof, and relates to the technical field of punching machines, the metal forming punching device comprises a punching machine body placed on the ground, the telescopic end of an oil cylinder at the top of the punching machine body is fixedly connected with an upper die base, and the bottom of the punching machine body is fixedly connected with a lower die base; a supporting frame is slidably connected to the outer side of the lower die base, and positioning structures are arranged on the two sides of the top of the supporting frame. According to the metal forming stamping device with the positioning structure and the using method of the metal forming stamping device, accurate transverse positioning and one-way stepping feeding of a metal material plate are achieved through the double-positioning clamping block, the four-point contact pulley block and the ratchet wheel system, it can be guaranteed that the material plate is kept stable in the stamping process through the synergistic effect of the driving wheel and the movable wheel, deviation is avoided, and the stamping quality is improved. And by controlling the downward moving distance of the rack, the rotation angle of the gear, the number of rotation turns of the first spline shaft and the final step pitch of the material plate driven by the driving wheel to move are adjusted.

The invention relates to the technical field of mechanical cutting, in particular to a pipeline welding beveling machine with an automatic positioning function, which comprises a rack and a driving frame, a plurality of supporting arms are arranged between the driving frame and the rack, and a cutting assembly is arranged at one end, far away from the rack, of the driving frame; the driving frame moves in the axis direction of the pipeline, the multiple supporting arms are synchronously driven to be unfolded in the radial direction of the pipeline, after the multiple supporting arms are attached to the inner wall of the pipeline, the friction force generated by multi-point contact counteracts the cantilever load, located at the end opening of the pipeline, of the cutting assembly, and the gravity center of the beveling machine is stabilized in the pipeline; and along with continuous movement of the driving frame, the supporting force of the supporting arm on the pipeline is gradually enhanced, so that the cutting force and vibration are compensated, and the machining stability is improved. The situation that a traditional beveling machine depends on an external clamp or is fixed in a hoisting mode is avoided, automatic fixing can be achieved through a multi-point contact supporting arm structure, the device is suitable for operation in a narrow space, and construction convenience is improved.

The invention relates to an aperture structure, in particular to a high-stability variable aperture structure and photographic equipment, which comprises a fixing assembly, the fixing assembly comprises a fixing seat and a fixing cover, and a rotatable turntable and a plurality of aperture blades are mounted between the fixing seat and the fixing cover. The aperture blades are movably connected between the rotating disc and the fixing assembly through a guide structure, the fixing assembly is provided with a limiting concave part, the rotating disc is provided with a limiting groove, and the aperture-variable adjusting hole a is defined by the aperture blades. The rolling piece is arranged between the fixing assembly and the rotating disc in a point contact mode on the rotating disc, so that the rotating disc reduces rotating friction and improves rotating efficiency through the point-contact rolling piece, the rolling piece supports the rotating position of the rotating disc in a point contact mode, and the zero-clearance matching effect is achieved; the stable opening and closing of the aperture blades benefit from the zero-clearance stable rotation of the turntable, thereby facilitating the improvement of the photographing and imaging effect of a user, and improving the photographing quality.

The utility model discloses an orthodontic bracket capable of reducing friction force, which is characterized in that single-side oblique angles are arranged on the near, far and middle opening sides of a main arch wire groove, the two single-side oblique angles are arranged in parallel, a horizontally arranged transition groove is formed between the two single-side oblique angles of the main arch wire groove, and the transition groove is communicated with the main arch wire groove. The oblique angles are arranged on the near, far and middle opening sides of the main arch wire groove, so that the contact between the dental arch wire and the side wall of the main arch wire groove is changed from linear contact to point contact, the contact area between the dental arch wire and the groove of the main arch wire groove is reduced when teeth incline and move, and the dental arch wire ligature structure has the advantages that the dental arch wire ligature structure is simple in structure and convenient to use. The friction force between the teeth is reduced, the anchorage is saved, and the tooth moving efficiency is improved; the transitional groove is formed in the main arch wire groove, so that the bracket can be quickly positioned during clinical operation, the bracket is ensured to be positioned in the middle of teeth, and doctors in the industry can accept and master the bracket more easily.

The invention discloses a high-precision ball screw nut grinding device, which belongs to the technical field of grinding machining and comprises a base and a multi-point positioning clamping module. According to the device, the grinding assembly and the thread cutting assembly are arranged in a matched mode, two sets of grinding structures are adopted to grind the nut, compared with a traditional grinding structure, the contact area between the two sets of grinding structures and the surface of the nut is greatly reduced, multi-point contact grinding is adopted, and the grinding efficiency is greatly improved under the condition that grinding is not affected. Heat generated by materials during nut grinding can be greatly reduced, cooling liquid does not need to be used for real-time cooling, the cleanliness in a cabin is greatly improved, meanwhile, synchronous cutting of internal threads of the nut can be achieved in the process of external grinding of the nut, subsequent additional machining procedures are not needed, and the machining efficiency is improved. The nut machining efficiency is improved, the grinding thickness can be accurately controlled according to requirements during machining, and the actual application effect of equipment is improved.

The invention provides a high-sensitivity double-point contact single-pole microswitch. The high-sensitivity double-point contact single-pole microswitch comprises a base group, the base set is sleeved with a shell, and a mounting cavity is formed between the base set and the shell. An upper contact piece, a lower contact piece and a supporting frame which are connected with the base set are sequentially arranged in the installation cavity. A flat reed assembly and a bow reed are connected to the supporting frame. The shell is provided with a key, and the key is matched with the flat reed assembly to work; the support frame is provided with an inclined trapezoidal groove, and the bow reed is connected with the support frame through the inclined trapezoidal groove; the flat reed assembly comprises a flat reed, one end of the flat reed is provided with a plurality of movable contacts, and the other end of the flat reed is connected with the supporting frame. According to the double-insurance single-pole microswitch, the double-insurance problem of contact of an existing single-pole microswitch is solved, a traditional single-point contact mode of a single movable contact and a contact piece is changed into double-point contact, and a single-insurance single-pole microswitch is improved into a double-insurance single-pole microswitch under the condition that indexes such as the boundary dimension and the action characteristic of the switch are not changed; contact reliability of the switch is greatly improved, and actual requirements are met.

The invention belongs to the technical field of medical devices, and particularly relates to a medical anesthetic quantitative injector which comprises a medical needle tube, an injection needle is fixedly mounted on the outer wall of the bottom of the medical needle tube, and an anti-rolling touch plate is fixedly connected to the outer wall of the periphery of the top of the medical needle tube. A nitrile rubber buna injection valve plug is movably connected to the inner wall of the medical needle tube, an extension plate is fixedly connected to the outer wall of the top of the nitrile rubber buna injection valve plug, a pressing plate is fixedly connected to the outer wall of the end, away from the nitrile rubber buna injection valve plug, of the extension plate, and two quantitative keeping sleeves are movably attached to the outer wall of the top of an anti-rolling touch plate; the two quantitative keeping sleeves are symmetrically attached in a semicircular state, a fixing pull ring is fixedly connected to the outer wall of one side of each quantitative keeping sleeve, four-point contact is achieved through the index finger, the middle finger, the finger seam and the thumb of a physician, a more stable injection gesture is formed, clamping slipping is not prone to being formed, and the index finger, the middle finger and the finger seam form a triangular fixing base plate. And shaking caused by thumb pressing is reduced.

The invention discloses a multi-contact elastic connector and an intelligent contact detection system thereof, and particularly relates to the technical field of elastic connector contact detection, the multi-contact elastic connector comprises a mounting plate, a contact body fixing plate and a contact body arranged on one side of the contact body fixing plate, and the top of the mounting plate is provided with a central processing unit. A contact point contact stable adjusting mechanism is arranged between one side of the mounting plate and one side of the contact body fixing plate, the contact point contact stable adjusting mechanism is used for adjusting the position of a contact point on the contact body, and the device further comprises a vibration behavior sensing module and a contact electrical parameter dynamic monitoring module. According to the invention, the problem of intermittent electrical disconnection caused by instantaneous separation of the contact points due to inertial jitter of the multi-contact elastic connector under a vibration working condition is solved, the contact state can be monitored in real time, the contact point positions can be accurately adjusted, and the contact stability and the signal transmission reliability of the connector are effectively improved; the method is suitable for precision connection requirements in a high-reliability scene.

The invention provides a four-point supporting three-point leveling mechanism and a leveling method for a precision measuring table, and belongs to the technical field of precision measuring table leveling. Four-point supporting is achieved through the two piezoelectric ceramic stacking micro-displacement mechanisms and the two air springs, stability is improved, communication of the two air springs is equivalent to single-point supporting, three-point leveling is achieved by controlling the two piezoelectric ceramic stacking micro-displacement mechanisms, and control precision is improved; a piezoelectric ceramic stack is adopted to push a top block, a leveling top ball and a wedge block to realize micro-displacement adjustment, and high-precision control and quick response are completed. The four-point supporting three-point leveling mechanism of the precision measuring table has good dynamic stability, the steady-state error reaches 10-5 degrees, friction lag and assembly stress caused by surface contact are avoided through single-point contact of the leveling top ball and the wedge-shaped block, and precision automatic leveling in the mandrel measuring process can be achieved.

The utility model discloses a reflector bracket, which comprises a fixed structure, a movable structure and a tension spring for connecting the fixed structure and the movable structure, the fixed structure comprises a fixed block, and the movable structure comprises an adjusting block capable of swinging relative to the fixed block; one of the fixed block and the adjusting block is provided with a ball body, the other one of the fixed block and the adjusting block is provided with a flat plate, and the ball body is supported on the flat plate and is in point contact with the flat plate. Compared with the prior art, the utility model has the advantages that the friction force between the ball body and the flat plate can be kept at the level as small as possible through the point contact matching of the ball body and the flat plate, thereby ensuring that the adjusting block smoothly swings relative to the fixed block and improving the stability; besides, the mode that the sphere is matched with the flat plate can save the space and the cost of the reflector bracket, so that the processing of each structure in the reflector bracket and the installation of parts do not conflict with each other.

A method of recovering a master calibration state of a coordinate positioning machine has a first member that is moveable relative to a second member, wherein the geometry of the machine is characterised by a set of model parameters. The machine is controlled to make point contact between multiple reference surfaces of a tool mounted on the first member and multiple reference surfaces of an artefact mounted on the second member. The separations between these contacting surfaces that would be expected from the current model parameters are determined, and these separations are recorded as a set of master separations. The contacting step is subsequently performed again in respect of at least some of the contacts for which master separations were recorded. At least one of the model parameters is updated to provide a closer correspondence between the expected separations and the master separations.

A system includes a bottom hole assembly (BHA) that includes a drill bit configured to drill a pilot hole in a subterranean formation, such that the drill bit provides a first point of contact between the BHA and the subterranean formation. The BHA includes a steering pad assembly that includes one or more steering pads each configured to move over a path of travel between a retracted position and an extended position to provide a second point of contact between the BHA and the subterranean formation, and a reamer configured to expand the pilot hole into a borehole, such that the reamer provides a third point of contact between the BHA and the subterranean formation. The system includes a controller configured to steer the BHA via the first, second, and third points of contact and adjustments to the second point of contact via control of the steering pad assembly.

A relay includes a first contact portion, a second contact portion, and a driving portion. The first contact part comprises a first movable contact spring, and a first movable contact, a first stress piece and a second stress piece which are arranged on the first movable contact spring. The second contact portion includes a first stationary contact. The driving part is provided with a first driving piece, and the first driving piece is located on the side, opposite to the first static contact, of the first movable contact spring and is configured to push the first stress piece to move so that the first movable contact can make contact with the first static contact and pull the second stress piece to move so that the first movable contact can be separated from the first static contact. The rigidity of the first stress piece is smaller than that of the second stress piece, and in the process that the first driving piece pushes the first stress piece, the first stress piece can deform to provide contact pressure for the first movable contact and the first static contact.

The present disclosure relates to a bending and rotation mechanism that enables control of bending operations accompanied by rotational operations. The mechanism includes a bending and rotation object the can be subjected to bending operations and rotational operations, and a string-like object contacting the bending and rotation object at a first contact point and second contact point of the bending and rotation object. A straight line connecting the first contact point and the second contact point is on a skew line relative to the axis of the bending and rotation object. The bending state and rotation state of the bending and rotation object are controlled on the basis of the length of the string-like object between the first contact point and the second contact point. The present disclosure can be applied, for example, to a bending and rotation mechanism, an information processing device, an electronic apparatus, or an information processing method.

The utility model discloses a containing and conveying device with a small contact surface with a sample, which relates to the technical field of conveying equipment and comprises a slide way, two prismatic cylinders are arranged at two ends of the slide way, a sample for containing a needle tip is arranged above the position between the prismatic cylinders, and a sample for containing the prismatic cylinders is arranged in the middle position between the two prismatic cylinders at two ends. Angle adjusting buckles are arranged at the bottoms of the prismatic columns, vertical angle adjusting bolts are connected to the angle adjusting buckles, the side faces of the prismatic columns with a certain inclination angle are adopted for receiving samples, and the edges of the samples make point contact with the edges of the prismatic columns and do not make contact with the surfaces of the samples; the upper end of the prismatic cylinder is needle-point-shaped, so that a sample is in point contact with the needle point, and the contact area between the sample and the device is very small; the angular position adjusting device is adopted, so that the horizontal position, the horizontal angle and the vertical angle of the prismatic cylinder can be adjusted and controlled, the position suitable for containing samples can be adjusted and arranged, and the samples of different sizes and specifications can be stably contained and conveyed.

The utility model relates to the technical field of aeronautical instruments, and discloses a dual-redundancy spring piece-contact actuating mechanism which comprises a base, a movable contact assembly, two static contact assemblies and an ejector rob, the movable contact assembly is provided with two first contacts, the number of the static contact assemblies is two, and the ejector rob is provided with two second contacts. Each static contact assembly is provided with a second contact which can be in contact fit with the first contact, and the push rod is used for sensing the change of the sensitive element to drive the first contact to move so as to be in contact with or separated from the second contact. According to the utility model, the movable contact assembly is provided with the two first contacts, the two first contacts are matched with the two second contacts on the static contact assembly, and the push rod is used for sensing the change of the sensitive element to drive the first contacts to move so as to be in contact with or separated from the second contacts, so that when the switch outputs a double-switching-value signal, the double-switching-value signal is output; the on point and the off point of the switch keep a consistent minimum difference value, delay of starting and resetting of the switch is reduced, and it is ensured that two switching value signals are kept consistent when the double-value switch is on or off.

The invention relates to the technical field of electric tool switches, in particular to a redundant contact electric tool switch which comprises a shell, a mounting structure, a control structure, a sealing structure, a driving structure and a triggering structure. The arrangement of the trigger structure realizes double-point contact, the design of the redundant contact system avoids the problem of poor contact caused by abrasion of a single contact, avoids the problem of repeated disassembly of the switch for maintenance, improves the practicability, and meanwhile, the movable and static contacts are not easy to fall off when being in contact, are strong in stability, and are convenient to maintain. The arrangement of the sealing structure ensures the overall sealing performance inside the switch, avoids the problem of poor contact caused by dust entering the switch, avoids the problem that a sealing ring at the joint of the button and the shell is easy to fall off, and the arrangement of the control structure realizes the switching between a switching mode and a rotating speed adjusting mode. The rotating speed of the electric tool is adjusted by pressing the button, and flexibility is high.

The utility model discloses a casting mould quick positioning connecting structure, including upper die and lower die, the die cavity surface clamping of upper die has lower die, still include three order positioning groove, fixed pin mechanism, mould spin hole and stop spin hole, the die cavity surface rectangle distribution of upper die is equipped with three order positioning groove, through setting three order positioning groove at upper die, and lower die place sets up mould spin hole and stop spin hole for assembling fixed pin mechanism, and the fixed pin mechanism of lower die place containing head fixed column, vice fixed platform, main fixed platform can cooperate three order positioning groove and form three point contact surface formula positioning connection, and the positioning butt joint level is increased significantly, can realize the positioning of upper die and lower die fast and accurately, and the composite installation mode of main fixed platform rear tail spin column cooperation inner hexagonal bolt at lower die, both solve the problem of single thread installation instability, and when the positioning part wears, through the convenient spin disassembly operation realizes the quick replacement of positioning structure.

The invention provides a touch action recognition method and device, a storage medium and electronic equipment, and belongs to the technical field of human-computer interaction. The method comprises the following steps: acquiring multi-frame queue data; calculating an effective contact number of the current frame data in the multi-frame queue data, and determining an action type to which the touch action of the current frame belongs based on the effective contact number; if the action type is a point contact type, calculating a corresponding dispersion degree according to the current frame data and the previous frame data, and determining whether the touch action of the current frame is one of a light touch action or a sliding action based on the dispersion degree; if the action type is a beating type or a palm type, calculating the number of continuous frames which are judged to be the same action type in the multi-frame queue data; and determining whether the touch action of the corresponding frame is one of a slow shooting action, a snapshot action, a long press action, a continuous touch action or a single touch action based on the number of the continuous frames. According to the invention, the recognition accuracy of complex gestures can be improved.

The utility model relates to a prism driving device, camera module and electronic equipment, comprising a base and a movable frame which is driven by a first driving assembly to rotate around an incident optical axis relative to the base, the prism driving device also comprises a fixed-point moving part and a plurality of ball groups, each ball group comprises a plurality of balls, the fixed-point moving part and the plurality of ball groups are respectively distributed on a plane vertical to the incident optical axis, the fixed-point moving part is in movable contact with at least any one of the base and the movable frame, and the ball groups are in movable contact with at least any one of the base and the movable frame. The driving device has the advantages that the design of the fixed-point moving part and the multiple ball groups is adopted, the precision and stability of the driving device are remarkably improved through the design of multi-point contact of the ball groups, and vibration and abrasion are reduced. Smooth rotation and high-precision positioning of the prism are ensured, and meanwhile, the modular design of the fixed-point moving part and the ball group facilitates maintenance and replacement.

The invention discloses a clamping device and a machining center for counter-pull hole machining of an outer duct stator blade, the clamping device comprises a blade body serving as a blade main body, a large end plate and a small end plate are mounted at the two ends of the blade body respectively, and the clamping device comprises a bottom plate; the bottom cushion block is mounted on the bottom plate and supported on the bottom surfaces of the large end plate and the small end plate; the upper pressing plate is located above the blade, and force is downwards applied to the upper pressing plate through the downward pressing assembly, so that the upper pressing plate is tightly pressed on the top faces of the large end plate and the small end plate; the positioning blocks are mounted on the bottom plate at intervals left and right, and are supported and positioned on the front side surfaces of the large end plate and the small end plate through the side cushion blocks; the side pressing assembly is tightly pressed on the rear side surfaces of the large end plate and the small end plate; the inner side positioning assembly and the outer side positioning assembly are respectively pressed on the left side surface and the right side surface of the large end plate in a point contact manner; therefore, reliable and accurate positioning and clamping of the blade are achieved, the problems of cutter vibration, displacement or deformation and the like in the machining process are effectively reduced or even avoided, high-precision machining of a machining center is matched, and the machining precision and the machining efficiency are greatly improved and guaranteed.

The utility model relates to the technical field of hot plug keys, and discloses a hot plug key module of a mechanical keyboard, which comprises a shaft body shell, a convex edge is fixedly connected to the outer side of the shaft body shell, a point contact mechanism is arranged in the shaft body shell, and a connecting mechanism is arranged in the bottom of the shaft body shell. According to the hot plug key module of the mechanical keyboard, the number of the arranged point contact mechanisms and the reset springs is four, and the resilience force generated by the reset springs to the sliding sheet is larger than that generated by the buffer springs to the sliding shell, so that when the shaft body module is used, the connecting clamping protrusion is stressed downwards to drive the sliding shell to move downwards, and then the sliding sheet is driven to move downwards through the buffer assembly; the pressing process of the shaft body in use is divided into two sections of force application and work doing processes, the reset spring enables the shaft body to have a flexible and timely rebound breakpoint in use, the buffer spring enables the shaft body to have a part of force storage distance in the pressing process, the pressing force needed by the shaft body in the initial stage in use is reduced, and use is convenient.

The utility model relates to the technical field of core-making machines, in particular to a core-making machine claw for clamping a sand core, which comprises two claw bodies fixed on a manipulator, inclined V-shaped grooves are arranged on the inner sides of the claw bodies, at least three groups of V-shaped bulges distributed along the inclined direction are parallelly and integrally arranged on the surfaces of the V-shaped grooves, and the V-shaped bulges are arranged on the surfaces of the V-shaped grooves. The cross section of the V-shaped protrusion is in a symmetrical arc shape, the V-shaped protrusion is used for clamping the core head, the core head is clamped through the V-shaped protrusion, curved surface contact is changed into point contact, grabbing force is increased, the phenomenon that a sand core slips due to the fact that the sand core is not firmly grabbed can be effectively prevented, and damage caused by falling of the sand core is reduced.

The application discloses a connector assembly, comprising: a shielding member comprising a plurality of ground exposed parts and a base, the base is located between two rows of signal exposed parts in the front-rear direction, the signal exposed parts are located within the common projection of the ground exposed parts and the ground member in the left-right direction, the first groove of the ground exposed part comprises a first contact wall, a second contact wall and a first shielding wall connecting the first contact wall, the ground holding part of the ground member comprises a first holding part and a second holding part, the first contact wall abuts against the first holding part in the front-rear direction, the second contact wall abuts against the second holding part in the up-down direction, both the contact stability of the ground exposed part and the ground member and the multi-point contact can be ensured, the ground area is increased, the contact position of the first contact wall and the first holding part in the left-right direction is located within the projection of the first shielding wall, and the signal interference generated by the signal emitted by the signal exposed part from the contact position of the first contact wall and the first holding part to other signal exposed parts is reduced.

The utility model relates to the technical field of locks, in particular to a door lock for an inner end door of a high-speed passenger train. Comprising a lock body, a lock cylinder is arranged on the lock body, and a pin shaft is arranged on the lock cylinder; a through groove for containing the lock column is formed in the lock body, a pin groove matched with the pin shaft is formed in one end of the lock column, and the other end of the lock column extends out of the lock body. Two positioning grooves perpendicular to the lock column are further formed in the lock body, ball screws facing the lock column are arranged in the two positioning grooves, two limiting concave rings matched with the ball screws are arranged on the lock column, and the two limiting concave rings are located at the positions where the lock column is matched with the ball screws when the door lock is in the opened state and the closed state respectively and used for fixing the lock column. According to the door lock for the inner end door of the high-speed passenger train, matching of materials is achieved, and the movement direction of the lock column is adjusted by limiting the degree of freedom; the surface contact between the lock column and the lock body is changed into point contact, the fit clearance between the lock column and the lock body is as small as possible, the extension and retraction of the spring bolt are flexible and free, and the phenomena of clamping stagnation and shaking are avoided.