681 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 utility model discloses a cutting type cutting tooth socketed pile drill bit which comprises a drill bit seat and is characterized in that a drill bit main body is assembled at the bottom end of the drill bit seat and comprises a drill tip, a hollow drill pipe, side wings, rib plates, cutting teeth and a circular ring; the hollow drill pipe is sleeved with the circular ring, and the drill tip is assembled at the bottom end of the hollow drill pipe. The ring is connected with the hollow drill pipe through a rib plate and is connected with the drill tip through a side wing; cutting teeth are assembled at the bottom of the drill tip, the middle parts of the side wings and the upper part of the ring; alloy ends are assembled at the end parts of the cutting teeth, and alloy points are arranged on the outer walls of the alloy ends; according to the cutting type cutting tooth socketed pile drill bit, the perpendicularity of formed holes is guaranteed; meanwhile, the cutting tooth drill bits with fixed cutting angles at the bottom, the side wings and the like are used for breaking rocks, line contact of a common scraper drill bit is improved into point contact of the cutting tooth drill bits, the pressure intensity is increased, the overall cutting capacity is improved, meanwhile, limitation of the diameter of a drilled hole is avoided, and different pile diameter requirements can be met by additionally installing the cutting tooth drill bits.

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 invention provides a flexible connection structure which comprises a lead screw, an axial push block connected to the lead screw and a globe roof installation connection block, a groove with an elastic globe roof structure is formed in the globe roof installation connection block, at least part of the axial push block is inserted into the groove, the elastic globe roof structure is in point contact with the two sides of the axial push block, and the elastic globe roof structure is in point contact with the two sides of the axial push block. The elastic ball top structure comprises a first point contact mechanism and a second point contact mechanism which are located on the two sides of the groove, the first point contact mechanism is an elastic point contact mechanism and comprises an elastic ball head plunger, the elastic ball head plunger comprises an elastic telescopic ball head, and the second point contact mechanism is a rigid point contact mechanism and comprises a ball push rod. The ball push rod comprises a rigid fixed ball head, and the two sides of the axial push block are in point contact with the first point contact mechanism and the second point contact mechanism respectively. The invention also provides an objective table. The objective table has the beneficial effect that the influence of transmission external force of the motion shaft of the objective table is well eliminated.

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 utility model provides a paint spraying clamping jig which comprises a supporting assembly, the supporting assembly comprises a clamping piece, the clamping piece is connected with a product in a clamped mode so as to fix the product, in the first direction, the two opposite sides of the clamping piece make point contact with the product so as to limit the product to move in the first direction, and / or in the second direction, the two opposite sides of the clamping piece make point contact with the product so as to limit the product to move in the second direction. The two opposite sides of the clamping piece make point contact with the product so as to limit the product to move in the second direction. According to the paint spraying clamping jig, the product is clamped and fixed through the clamping piece, the clamping piece is connected with the product in a clamped mode and is in point contact with the product, the clamping piece has the minimum shielding area in the product clamping and fixing process, the product only needs to be clamped once, the requirement for paint spraying on the front face or the back face of the product is met at a time, the production cost is reduced, and the production efficiency is improved. And the production efficiency is improved.

The utility model relates to the technical field of machine tool machining, and discloses a workpiece clamping device for a large machine tool, which comprises a concave base, the top of the base is fixedly connected with a placing plate for placing a tubular workpiece, and a left-right axial rotating rod is arranged in the base. The two sides of the rotating rod are each provided with two symmetrical clamping plates, the tops of the clamping plates extend to the position above the containing plate, the two clamping plates can rotate in the opposite directions to clamp workpieces, and two pressing blocks capable of ascending and descending are arranged above the containing plate. According to the clamping device, a tubular workpiece needing to be clamped can be placed on the surface of the placing plate, the surface of the tubular workpiece can be clamped through opposite rotation of the two corresponding clamping plates, then the positions of the two pressing blocks can descend, and the tubular workpiece is pressed on the placing plate; at the moment, the two sides of the tubular workpiece are in three-point contact through the corresponding pressing blocks and the two clamping plates, the clamping and fixing effect is achieved, and the fixing mode can be compatible with workpieces of different diameter specifications for use.

A high-conductivity metal dome reed comprises a sheet pot-cover-shaped elastic pressing part, a supporting part is arranged on the periphery of the elastic pressing part, a through hole is formed in the elastic pressing part, and the lower edge of the through hole serves as a conduction deformation contact part. According to the utility model, the structure is ingenious and reasonable, the lower edge of the through hole is used as the conduction deformation contact part, after the elastic pressing part is pressed downwards and elastically deforms, the lower edge of the through hole is in line contact or multi-point contact with a matched circuit contact, the conduction contact is sufficient, the reliability is greatly improved, and the normal use and control of the switch are ensured. Moreover, when the lower edge of the through hole is in a downward elastic deformation state, wrinkles protrude downwards, a certain puncturing effect is achieved, and even if a small amount of debris foreign matter exists below, the wrinkles protrude downwards can push away or penetrate the debris, so that conduction contact is ensured.

The present invention relates to a test head for a probe station, which is used in conjunction with a carrier and a probe card, and includes a cover plate, a fixed frame, an interface board, a needle tower and a box body; a joint and a downward connection point are provided on the interface board, the connection point is electrically connected to the joint, and the interface board is fixedly installed with the fixed frame; the needle tower is installed under the fixed frame, the needle tower is provided with a pinhole, a spring pin is installed in the pinhole, the upper end of the spring pin is in contact with the connection point of the interface board, and the lower end of the spring pin is used to contact and connect with the probe of the probe card; the other end of the cover plate is flipped relative to the rotation axis to realize the closed cover state and the open cover state between the cover plate and the box body; in the closed cover state, the lower end of the spring pin of the needle tower can pass through the through hole A at the bottom of the box body to form a contact connection with the probe on the probe card. The present application can achieve reliable connection with the probe through a simple structure.

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 utility model discloses an inter-board high-speed connector with an anti-misplug function. The inter-board high-speed connector comprises a printed board welding plug and a printed board welding socket which is adaptively connected with the printed board welding plug. The installation mode of the plug and the socket is printed board welding, during use, the plug and the socket are fixed with the installation board through the special-shaped guide pin and the special-shaped guide sleeve at the two ends, then pin welding is carried out, and during insertion, axial insertion in place is carried out through the insertion interface. According to the inter-board high-speed connector with the misplug prevention function, the special-shaped guide pins are used for positioning before insertion, and the misplug prevention function is realized through different fillets on the shell; the differential contact element for transmitting high-speed signals adopts a multi-point contact stranded wire contact pin structure, so that the insertion and extraction are soft, and the connection is reliable. The connector provided by the utility model has the characteristics of novel structure, soft plugging and unplugging, reliable connection, misplug prevention and the like.

The utility model discloses an eight-jaw clamp for a lathe, comprising a main body, four jaw seats are evenly arranged at the edge of the front side of the main body in a circumferential direction, a first wedge block is slidably inserted into the side surface of the main body corresponding to the position of the jaw seat, the bottom of the jaw seat is fixedly connected to the first wedge block, a telescopic spring is inserted into the interior of the main body along the sliding direction of the first wedge block, one end of the telescopic spring is fixedly connected to the first wedge block, and the other end of the telescopic spring is fixedly connected to the main body; a central connecting column is slidably inserted into the center of the interior of the main body, and a pull rod connecting plate is arranged at one end of the central connecting column; the utility model forms an eight-jaw clamp by cooperating with four groups of pressure plate seats and four jaw seats, which can better realize self-centering clamping of cylindrical workpieces, complete multi-point contact clamping, reduce clamping deformation, and improve production quality.

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 discloses a positioning and clamping device for fine boring of a planet carrier. The positioning and clamping device is characterized by comprising a base, equal-height blocks, an inner hole tensioning device, a pressing device and a positioning bolt, the base is installed on a boring equipment working platform, and the inner hole tensioning device is installed on the base and used for tensioning an inner hole in the lower end of a workpiece through a steel ball. The equal-height blocks are evenly distributed on the upper plane of the base in a circumferential mode and used for supporting workpieces. The lower end of the positioning bolt is mounted on the left upper side of the base, and the upper end is inserted into a process positioning hole in a workpiece; the two pressing devices are symmetrically arranged on the left side and the right side of the base and used for pressing the workpiece. The multiple steel balls which are arranged in the same horizontal plane and evenly distributed in the circumferential direction are adopted to tension / loosen the inner hole in the lower end of the workpiece along with vertical movement of the abrasion-resistant taper sleeve, operation is easy and fast, the tensioning positioning precision is high, the steel balls make point contact with the inner hole of the workpiece, the contact area is greatly reduced, and the inner hole of the workpiece cannot be damaged.

The present invention provides a flexible connection structure of a lead screw, including a lead screw, a lead screw nut seat, a linear guide, an axial push block, a ball top mounting connection block and a stage moving component, wherein the lead screw nut seat is mounted on the lead screw, the lead screw nut seat and the linear guide form a moving pair, the axial push block is mounted on the lead screw nut seat, the stage moving component is mounted on the ball top mounting connection block, the ball top mounting connection block is provided with a groove having an elastic ball top structure, the axial push block is provided with a raised plug block, the plug block is inserted into the groove having an elastic ball top structure, and the elastic ball top structure is in point contact with both sides of the plug block. The present invention also provides a flash tester stage. The beneficial effects of the present invention are: the influence of external transmission force on the stage moving axis is better eliminated.

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 invention relates to the technical field of laser cutting equipment, and discloses a metal pipe fitting separation machining laser cutting machine which is used for solving the problem that indentations are likely to appear on a metal pipe fitting due to point contact between a positioning piece and the metal pipe fitting. A moving groove is formed in a supporting shaft of a positioning piece, a sliding sleeve and two supporting bags are arranged on the moving groove in a sleeving mode, and the supporting bags are filled with extrusion liquid; when the supporting shaft of the positioning piece clamps the round metal pipe fitting, the supporting bag on the supporting shaft firstly makes contact with the metal pipe fitting till the metal pipe fitting extrudes the supporting bag, one side of the metal pipe fitting is tightly attached to the side wall of the supporting shaft, at the moment, the metal pipe fitting makes contact with the supporting shaft and the supporting bag, point contact is changed into face contact, and the metal pipe fitting is clamped through the supporting bag. Therefore, extrusion of the supporting shaft to the metal pipe fitting is reduced, and the metal pipe fitting is prevented from being extruded by the supporting shaft to generate indentations.

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.

An upper cover plate and a lower groove cavity are connected in a buckled mode through an anti-skid structure to form a complete wire groove, the anti-skid structure comprises a buckling groove and a buckling protrusion, the shape of the outer side face of the buckling protrusion is matched with the shape of the inner side face of the buckling groove, and the outer side face of the buckling protrusion is in full-contact connection with the inner side face of the buckling groove. Compared with point contact, large-area surface contact has the advantages that friction force between the buckling grooves and the buckling protrusions is improved, tight binding force between the upper cover plate and the lower groove cavity is improved, and the situation that the upper cover plate slides off from the lower groove cavity is avoided; the V-shaped structure of the first buckling plate and the second buckling plate enables the buckling protrusions to have a certain elastic change range, the interference fit between the buckling grooves and the buckling protrusions increases the interaction force between the buckling protrusions and the buckling grooves, and the stress between the buckling protrusions and the buckling grooves is increased due to deformation. The tight combination degree of the buckling protrusion and the buckling groove is improved, and the situation that the upper cover plate slides off from the lower groove cavity is prevented.

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.