1028 results about "Counterbore" patented technology

The present disclosure is of an assembly between the drive head of a ratcheting wrench and a ratcheting wrench handle. A fastener is provided between the drive head and the handle. The drive head is pivotably connected to the handle by the fastener. The fastener is inserted through apertures of the drive head and the handle. The fastener is threaded at one end. An aperture of the handle is correspondingly threaded. The threads of the fastener and / or the handle do not extend the entire length of the aperture. The aperture with the thread may further have an unthreaded counterbore. The unthreaded counterbore mates with or abuts directly against an unthreaded portion of the fastener.

The utility model discloses a mounting beam, battery lower box, battery pack and vehicle, the mounting beam includes beam body and bushing, beam body includes the roof and bottom plate that are arranged along first direction at interval, bottom plate has the first surface that is opposite to the roof, the bushing is connected with roof and bottom plate, the bushing is located the first surface of bottom plate and faces the roof side, and the bushing is connected with the first surface of bottom plate. A mounting hole and a counterbore which are arranged in the first direction and communicate with each other are formed in the bush, and the diameter of the mounting hole is smaller than that of the counterbore. The mounting beam provided by the utility model has the advantages that the head of the threaded part is prevented from being exposed to influence the appearance attractiveness of a vehicle body and collide with other parts, and the mounting reliability of the battery pack on the vehicle body is high.

The invention discloses a thinning drawing die capable of improving hole wall thickness uniformity, which comprises an upper die holder, a lower die holder, an upper backing plate, an ejector rod fixing plate and a female die sleeve fixing plate, the upper backing plate, the ejector rod fixing plate and the female die sleeve fixing plate are sequentially stacked and fixed on the upper die holder, and a thinning female die sleeve is arranged on the female die sleeve fixing plate; a thinning male die is fixedly arranged on the lower die base. The thinning male die comprises a solid cylinder part and a variable end located on the cylinder part, the diameter of the variable end is gradually decreased from the end, in butt joint with the cylinder part, of the variable end to the tail end, and an inverted-cone-shaped counter bore is formed in the end of the variable end. A group of separation seams arranged along the axis direction of the thinning male die are uniformly distributed on the side wall of the variable end head, and the variable end head is separated into a plurality of mutually independent thinning stretching sheets by the separation seams; the ejector rod fixing plate is provided with an ejector rod for opening the variable end, and the end of the ejector rod is provided with a frustum matched with the counter bore. The internal uniformity of the fin holes can be improved, and the height of the fin holes is increased.

The present invention discloses a hydraulic brake valve and its exhaust process method. The valve body of the exhaust structure touches and presses the operating mechanism at the top of the valve body component of the valve body. A working spring is installed on the valve plug of the valve body. The valve core is installed in the central hole of the valve body and the central counterbore of the plug. The valve core is inserted into the center of the plug, and the counterbore presses the return spring. The return spring is installed on the spring seat, and the spring seat is installed in the counterbore of the plug. The roller of the operating mechanism touches and presses the plug in the valve body to form action and reaction forces, and promotes the operating mechanism and the valve core to touch and press and move to work. The valve core can slide along the inner wall of the valve body. An exhaust hole is provided on the side wall of the valve core. A plug for blocking the other end of the valve body is provided in the valve body, and a spring seat abutting against the plug is further provided in the plug. A return spring is installed between the spring seat and the valve core. The advantages are: avoiding abnormal noises and cavitation phenomena caused by gas accumulation to the hydraulic brake valve, ensuring the normal transmission and circulation of hydraulic oil in the pipeline, and eliminating potential hazards of the hydraulic braking system.

The invention relates to the technical field of semiconductor packaging and cooling, and particularly discloses a diamond-copper composite micro-channel-based cooling and packaging structure which comprises a packaging shell and a diamond-copper heat conduction plate with the bottom in floating lap joint through an elastic sealing ring. A plurality of heat exchange stand columns are integrally formed on the upper surface of the heat conduction plate, and the heat exchange stand columns are inserted into the containing counter bores of the packaging shell to form micro-channel annular gaps. A piezoelectric vibration plate dividing the medium cavity into a storage cavity and a jet flow cavity is integrated in the packaging shell, and the jet flow cavity communicates with a flexible connecting pipe section arranged over the heat exchange stand column in a suspended mode. Spiral fins are arranged on the surfaces of the heat exchange stand columns, horn-shaped flow guide pieces are arranged at orifices of the containing counter bores, and C-shaped groove flow guide fins which are arranged in a staggered mode are arranged on the bottom face of the heat conduction plate. According to the invention, low-thermal-resistance, high-flux and high-reliability direct contact type active heat dissipation for a high-power-density device is realized.

The present application belongs to the technical field of aircraft assembly, and provides a device and method for controlling the depth of a counterbore of an engine suspension fastener hole. The device is used in the process of drilling an engine suspension fastener hole and counterbore, and controls the depth of the counterbore. The device is composed of a micrometer, a sensor and a tool holder. The micrometer is fixed on the tool holder, and the end of the micrometer is a flat surface. The working end of the sensor is a half-spherical surface, which can be compressed. The tool holder moves with the deepening of the counterbore depth, so that the end surface of the micrometer and the sensor are in contact and the sensor is compressed. When the compression reaches a certain depth, the sensor triggers, the device stops the counterbore, the tool exits the product, and the assembly part is automatically counterbored to the required size. The present application can automatically control the depth of the counterbore of the assembly part and the part.

The invention discloses a rigid casing stabilizer and relates to the technical field of oil field low-carbon exploitation. An annular counter bore is upwards formed in the lower end face of the centralizing sleeve, a lifting sleeve is arranged in the annular counter bore and connected with the annular counter bore through threads, the upper portion of the lifting sleeve is connected with a compression spring A through a plane bearing, the upper portion of the compression spring A abuts against the bottom of the annular counter bore, and a balance cutting mechanism is arranged on the lower portion of the lifting sleeve. The drilling tool has the beneficial effects that the balance cutting mechanism is arranged on the lower portion of the centralizing sleeve, when the well diameter is irregular during casing running and the main cutting block and the auxiliary cutting block encounter the inner protrusion of the well wall, the lifting sleeve starts to rotate and ascend, the main cutting block and the auxiliary cutting block cut the well wall, the casing can be smoothly put into a shaft, and the drilling tool is convenient to use. And during cutting, large bending force cannot be formed on the casing pipe, so that the casing pipe is protected.

A mobile phone may include a housing including a wall segment, the wall segment defining a through-hole extending therethrough, the wall segment including a cladding portion formed from a first metal. The cladding portion may define a portion of a side exterior surface of the mobile phone, and a first portion of the through-hole. The wall segment may further include a core portion coupled to the cladding portion and formed from a second metal different from the first metal, the core portion defining a counterbore hole extending through the core portion and aligned with the through-hole, and a lining structure formed of the first metal and positioned in the counterbore hole in the core portion and fused to the cladding portion at a fusion region, the lining structure defining a second portion of the through-hole.

The utility model discloses a pocket type dust collector for discharging a calcium carbide furnace, which comprises a dust collection box body, a bag mounting frame is arranged in the dust collection box body, a counterbore is arranged on the bag mounting frame, a dust collection bag is arranged in the counterbore, a framework is arranged in the dust collection bag, and an elastic ring is arranged on the framework; a cover ring is rotatably arranged above the dust removal bag, and the dust removal bag is detachably installed in the counterbore through a plug pin by means of the cover ring. According to the dust collection bag, the dust collection bag is detachably installed in the counterbore through the elastic ring, the cover ring and the plug pin, and the dust collection bag can be replaced by pulling out the plug pin and rotating the cover ring during replacement; and meanwhile, the dust removal bag is fastened in the countersunk head groove through the cover ring and the elastic ring, so that the dust removal bag is not easy to fall off.

The tooth-depth-adjustable large-cutting-depth tooth-inserted end face milling cutter comprises a cutter connecting base, a plurality of sliding grooves are formed in the periphery of the lower portion of the cutter connecting base, an upper connecting sinking groove is formed in the center of the upward end of the cutter connecting base, and a circular lower connecting sinking groove is formed in the center of the downward end of the cutter connecting base. A connecting hole is formed in the cutter connecting seat between the upper connecting sinking groove and the lower connecting sinking groove; the cutter position adjusting assembly comprises a sliding block which is just connected to the cutter connecting base in a sliding mode through the sliding groove, a height-adjustable cutter bar is connected to the sliding block, and a cutter body is fixedly connected to the portion, below the cutter connecting base, of the cutter bar; the multi-cutter-position adjustable design is adopted, multiple cutter positions are adjusted to be in stepped distribution in the working condition, the total allowance of plane machining is distributed to the multiple cutter positions, layered milling can be achieved through the multiple cutter positions when the cutter head rotates, and meanwhile the rotation diameters of the multiple cutter positions can be finely adjusted; the technical problem that the width direction needs to be machined twice when the rotation diameter of the milling cutter is slightly smaller than the machining width is solved.

To provide an angular contact ball bearing that ensures a certain level of strength of a holder even under high load capacity and high speed rotation to prolong its service life.SOLUTION: An angular contact ball bearing 1 comprises an inner ring 2, an outer ring 3, a plurality of balls 4, and a holder 5. The holder 5 has: a small annular part 6 located radially between a counterbore part 2b of the inner ring 2 and a shoulder part 3d of the outer ring 3; a large annular part 7 located radially between a counterbore part 3b of the outer ring 3 and a shoulder part 2d of the inner ring 2; and pillar parts 8 that connect the small annular part 6 and the large annular part 7 and are provided at multiple locations in a circumferential direction. The small annular part 6, the large annular part 7, and the pillar parts 8 form a pocket Pt that holds the plurality of balls 4. When a radial thickness of the small annular part 6 is T1, a radial thickness of the large annular part 7 is T2, and a diameter of the ball 4 is Da, the followings are satisfied: 0.170≤T1 / Da≤0.280; 0.170≤T2 / Da≤0.280; 0.90≤T1 / T2≤0.10.SELECTED DRAWING: Figure 1

The utility model relates to the technical field of manual hardware tools, in particular to an automobile tire wrench with convenient storage and stress application functions. Comprising a rotating shaft, a counter bore is formed in the upper portion of the rotating shaft, a rotating limiting block is rotationally installed in the counter bore, a rotating limiting mechanism is arranged between the rotating limiting block and the side wall of the rotating shaft, a first polygonal square hole is formed in the lower portion of the rotating shaft, a first sliding rod is slidably installed in the first polygonal square hole, and first sleeves are arranged at the two ends of the first sliding rod respectively; a second polygonal square hole is formed in the position, located on the outer side of the counter bore, of the rotary limiting block, a second sliding rod is slidably installed in the second polygonal square hole, and second sleeves are arranged at the two ends of the second sliding rod correspondingly. When the nut is screwed, the length of the first sliding rod or the second sliding rod serving as a force application rod can be adjusted according to needs, and the force application effect can be achieved without the help of an external force application rod. In addition, the first sliding rod and the second sliding rod can be rotated from a vertical state to a parallel state, so that the size is reduced, the space is saved, and storage is convenient.

A faucet with an improved hand wheel comprises a faucet body, a valve element, the hand wheel, a button, a positioning rod, a spring, a decorative cover, a gasket and a screw, and the faucet body comprises a valve element cavity and a positioning groove; the hand wheel comprises a spline tooth hole, a gasket cavity, a counter bore, a button hole and a guide limiting hole, the spring is arranged in the button hole, the button is in sliding fit with the button hole, the upper end of the spring is matched with the spring cavity, and the positioning rod extends into the button hole through the guide limiting hole to be fixed with the radial fixing hole; the spline type head of a valve rod of the valve element is inserted into the spline tooth hole, the gasket is arranged in the gasket cavity, the screw penetrates through the gasket to be screwed with the spline type head, and the decorative cover is detachably matched with the counter bore. The positioning rod and the positioning groove are embedded in a static state; when the button is pressed, the positioning rod leaves the positioning groove and enters a working state. The hand wheel is provided with a locking device, the hand wheel and the valve element cavity are locked together in a normal state, the button needs to be pressed for unlocking, and the hand wheel rotates; a stranger is prevented from rotating the hand wheel to directly discharge water, and the reminding function is achieved; and danger caused by operation of children is prevented.

An ejector mechanism for a firearm includes an ejector disposed at a forward face of a bolt. The ejector includes a hole designed to provide clearance for the firing pin to pass at least partially through the ejector. The hole may include a counterbore on a rear side of the ejector.

The invention provides a steel fiber prepreg tape reinforced polyethylene composite pipe and a connecting assembly, and relates to the technical field of pipes. The steel fiber prepreg tape reinforced polyethylene composite pipe and the connecting assembly comprise a butt joint pipe and two sets of connectors, and the two sets of connectors are arranged at the two axial ends of the butt joint pipe respectively. The two connectors are connected through the butt joint pipe, the abutting part presses the first flange into the connecting groove to prevent falling off, the hose clamp is matched to drive the clamping sleeve to clamp the connectors, the connecting strength is further improved, and the high-pressure conveying pipe can be applied to the high-pressure conveying occasion; double-layer sealing is carried out between the connector and the butt joint pipe through the first sealing ring used for axial sealing and the second sealing ring used for end face sealing, the sealing effect of the connecting position is effectively improved, the multiple sets of protruding rings are arranged on the outer wall of the inner connecting pipe, the friction force between the inner connecting pipe and the inner side wall of the counter bore is increased, and after the hose clamp is locked, the sealing effect is good. The anti-falling effect can be effectively improved, and the anti-pressure capacity of the connecting position is improved.

A flow restrictor includes a first flowbody defining a first end portion, a second end portion opposite the first end portion and an orifice between the first end portion and the second end portion. The first end portion defines a plurality of first slots, and the second end portion defines a counterbore having a first diameter. The flow restrictor includes a second flowbody defining a plurality of second slots and having a second diameter proximate the plurality of second slots that is greater than the first diameter of the first flowbody. The second flowbody is configured to be received within the counterbore of the first flowbody.

A soybean milk machine with a residue and juice separating device comprises a shell, an inner container, an electric heating body, a cover assembly, a knife assembly and a motor, a locking cavity with an upper opening is formed in a bottom plate of the inner container, and a pivoting hole is formed in a bottom plate of the locking cavity; a counter bore and a polygonal head are arranged at the upper end of a shaft of the motor; a magnetic cavity and a polygonal cavity are formed in a cutter shaft of the cutter assembly; the scum and juice separator comprises a barrel-shaped body part with an upper opening and a cover body, and the barrel-shaped body part is provided with a connector; one magnetic attraction piece is fixed in the counter bore, the other magnetic attraction piece is arranged in a magnetic cavity, a shaft of the motor is pivoted and sealed with the pivoting hole, the interface is detachably matched with the locking cavity, and the cover body is embedded into the cylindrical body part and is detachably matched with the cylindrical body part; the cutter assembly is located in the cylindrical body part, and the polygonal head part and the polygonal cavity are connected in an inserted mode and detachably connected through the magnetic attraction assembly. The scum-juice separator is convenient to disassemble and assemble, and the cutter assembly is located in the scum-juice separator and is convenient to disassemble and assemble with a shaft of the motor.

The invention discloses a rubber O-shaped ring compression stress relaxation test device which comprises an O-shaped ring mounting base, four circles of annular grooves are sequentially formed in the center of the O-shaped ring mounting base from outside to inside, a rubber O-shaped ring is arranged in the fourth circle of annular groove, a gasket is arranged above the rubber O-shaped ring, a force measuring sensor is arranged on the gasket, and the force measuring sensor is connected with the O-shaped ring mounting base. The force measuring sensor is tightly connected with the O-shaped ring mounting base through a fixing piece and a plurality of counterbores; the force measurement sensor is in wireless or wired connection with the data acquisition system; two flow guide holes and a temperature measuring hole are formed in the groove bottom of the second ring of annular groove, a temperature measuring sensor is inserted into the temperature measuring hole, the head of the temperature measuring sensor penetrates into the second ring of annular groove, and the tail of the temperature measuring sensor is connected with a thermodetector through a temperature measuring data connecting line; the oil temperature machine is communicated with the two flow guide holes through an oil conveying pipeline, and an oil pump is arranged on the oil conveying pipeline. The environment temperature of the rubber O-shaped ring can be controlled, and the actual working condition of the rubber O-shaped ring in lubricating oil can be simulated.

The utility model provides a mechanical arm mechanism, cleaning equipment and a cleaning system, and relates to the technical field of cleaning equipment. The mechanical arm mechanism comprises a mechanical arm, a rotating joint, a manipulator and a wire harness, the mechanical arm comprises a mechanical arm body and a first driver, the first end of the rotating joint is connected with the first driver, a counter bore extending towards the first end is formed in the second end of the rotating joint, and an avoiding groove extending in the circumferential direction by a preset radian is formed in the peripheral face of the rotating joint; the manipulator comprises a main body part, a second driver, a first clamping jaw and a second clamping jaw, the first clamping jaw and the second clamping jaw are rotationally connected with the first end of the main body part, and the second driver is configured to drive the first clamping jaw and the second clamping jaw to be switched between an opening state and a clamping state; the second end of the main body part is fixedly connected with the second end of the rotary joint, and an accommodating space formed by the main body part is communicated with the counter bore; one end of the wire harness is located on the mechanical arm, and the other end of the wire harness extends to the mechanical arm after penetrating through the counter bore in the rotating joint and the receding groove.

A ring-shaped gasket for making high-purity fluid pathway connections between opposing fluid delivery apparatus elements having at least one simple flat surface in contact with the gasket. The face of at least one apparatus element typically has a circular counterbore depression to receive the gasket, but is not required. The gasket has a body, pierced through by a hole creating a fluid pathway and defining a radial inner surface, and additionally having a radial outer surface, a first axial end surface and a second axial end surface. At least one of the first and second axial end surfaces has a stress concentration feature radially adjacent to a gasket sealing region, the sealing region constructed to be in contact with a face surface of a corresponding fluid conduit port. The stress concentration feature may be a groove or a plurality of cavities disposed adjacent the gasket axial end surface sealing region.

The utility model relates to the technical field of ecological restoration, in particular to an ecological restoration landscape greening slope structure which comprises a slope body, a plurality of groups of fixing plates are arranged on the slope body at intervals, a plurality of groups of baffles are arranged between every two adjacent groups of fixing plates at intervals, clamping blocks are fixedly arranged at the two ends of each baffle, and clamping grooves matched with the clamping blocks are formed in the fixing plates. A mounting cavity communicated with the clamping groove is formed in the fixing plate, a sliding block is slidably arranged in the mounting cavity, a limiting groove matched with the sliding block is formed in the clamping block, a fixing rod is fixedly arranged on the side, away from the clamping groove, of the sliding block, a counter bore aligned with the fixing rod is formed in the inner wall of the mounting cavity, the fixing rod is inserted into the counter bore, and the section, in the counter bore, of the fixing rod is sleeved with a spring. According to the slope structure, a worker arranges the fixing plate and the baffle on a slope body, then the clamping blocks on the baffle are embedded in the clamping grooves in the fixing plate, the fixing plate and the baffle are conveniently limited by sliding the sliding blocks, and the construction efficiency of the slope structure is improved.

The utility model relates to an anti-falling mechanism of a lifting platform. The anti-falling mechanism comprises a pin rod part, a spring, an assembly block and an electromagnetic unit which are correspondingly matched, a plurality of inserting holes are distributed in the inner fork arm around the pivot hole at intervals, counter bores correspondingly matched with the inserting holes are distributed in the outer fork arm, and threaded through holes are formed in the inner bottoms of the counter bores. The pin rod parts are matched with the counter bores in a one-to-one correspondence mode, the radial flange in the middle is matched with the counter bores, the rod body on one end side of the radial flange can be inserted into the counter bores, and the spring is arranged on the rod body on the other end side of the radial flange in a sleeved mode and can push the pin rod parts to be inserted into the counter bores. The assembly block is fixed to the outer fork arm, a cavity is formed in a block body, and the end of the side, sleeved with the spring, of the pin rod part can stretch into the cavity. The electromagnetic unit is assembled in the cavity and can selectively drive the pin rod part to move out of the inserting hole and be inserted into the inserting hole in the power-on state and the power-off state. The problem that the lifting platform falls suddenly can be effectively solved, and the situation that the lifting platform falls due to the fact that a hydraulic system breaks down is prevented.

The utility model relates to an armature three-phase copper bar height and position degree composite testing fixture, which comprises a base, an inner diameter sleeve is arranged on the base, a plurality of positioning pins are uniformly distributed on the periphery of the inner diameter sleeve on the base along the circumferential direction, the upper end of each positioning pin is coaxially connected with a cylindrical pin, a positioning column is arranged on the base, and the positioning column is provided with a positioning hole. A rectangular groove is formed in the side wall of the upper end of the positioning column, a counterbore is formed in the upper end face of the positioning column and communicated with the rectangular groove, a sliding block is arranged in the rectangular groove in a penetrating mode, a check block is arranged at one end of the sliding block, a threaded hole and a detection through hole are formed in the sliding block, and a detection pin is arranged in the detection through hole in a penetrating mode. Through the cooperation of the positioning pin and the positioning hole of the armature to be detected and the cooperation of the inner diameter sleeve and the inner circumferential surface of the armature to be detected, the reference surface of the armature can be well limited, simple and accurate armature positioning is realized, and the reference positioning consistency of batch products is better. The height and the position degree are synchronously detected through pushing of the sliding block, the problem that the measurement rhythm of a machine detection method is slow or the manual measurement error is large is effectively solved, and the stability and the detection rhythm of a product are better.

The invention provides an installation device and method for a real-time measurement probe for the running state of a steam turbine blade, a first counter bore is formed in the wall of an inner cylinder of a steam turbine, an inner cylinder wall bolt hole and a second counter bore are formed in the wall of the inner cylinder of the steam turbine, the inner cylinder wall bolt hole is communicated with one end of the first counter bore, and the second counter bore is communicated with the other end of the first counter bore; bolts with built-in measuring probes are installed in the bolt holes, six evenly-distributed threaded holes are machined in the wall of the steam turbine inner cylinder, a round metal plate is installed outside a bolt nut, and a center hole and six evenly-distributed through holes matched with the threaded holes are machined in the round metal plate. The device is simple and easy to implement, convenient to replace and better in sealing performance, the measuring probe is safer, more reliable and more stable in installation, the unit turbine blade can be monitored and evaluated for a long time, and the measuring probe can still work safely and stably for a long time in severe environments such as damp and steam blowing.

The present application relates to a kind of laminated U-shaped shape memory alloy damper, belong to structural vibration control technical field.Laminated U-shaped shape memory alloy plate a and laminated U-shaped shape memory alloy plate b are connected together including connecting piece a, connecting piece b;Connecting piece a both ends are provided with counterbore a, connecting piece b both ends are provided with counterbore b, counterbore a and counterbore b are all provided with counterbore bolt;Laminated U-shaped shape memory alloy plate a and laminated U-shaped shape memory alloy plate b are all combined by multiple U-shaped shape memory alloy sheet and multiple U-shaped rubber pad layer;Connecting piece a and connecting piece b end recess have square groove, the end of laminated U-shaped shape memory alloy plate a and laminated U-shaped shape memory alloy plate b is equipped with opening, the end of laminated U-shaped shape memory alloy plate a and laminated U-shaped shape memory alloy plate b is inserted into the square groove, and be connected together by multiple counterbore bolt.The present application effectively solves the problem of energy consumption and deformation.

The advection sealing valve comprises a valve body, valve covers are fixedly connected to the two axial ends of the valve body, an input port and an output port are formed in the valve body, a valve seat dividing an inner cavity of the valve body into two valve chambers is fixedly arranged in the valve body, a valve port is formed in the valve seat, and the input port and the output port communicate with the two valve chambers correspondingly; the valve further comprises a sealing piece located in the valve chamber, the sealing piece comprises a valve rod extending in the axial direction and a valve head set in sealing fit with the valve seat, a first counter bore and a second counter bore are sequentially inwards formed in the end, facing the valve seat, of the valve head set, the diameter of the first counter bore is smaller than that of the second counter bore, and a flat pressing hole communicated with the second counter bore is formed in the side wall of the valve head set. A balance valve head in sealing fit with the first counter bore is arranged in the second counter bore, one end of the valve rod is fixedly connected with the balance valve head, and the other end of the valve rod penetrates through the valve deck and extends to the outside. Wear parts can be replaced conveniently, and opening and closing of the valve head set are smoother and labor-saving by balancing internal and external pressure of the valve head set.

The utility model provides an angle grinder press plate and an angle grinder wrench, which comprise a circular press plate body, the center of the press plate body is provided with an internal threaded hole, and the upper side surface of the press plate body is uniformly provided with a plurality of polygonal counter bores to form a multi-surface contact structure of the press plate and the wrench so as to effectively prevent slipping during assembly and disassembly. The distances between the polygonal counter bores and the center of the nut body are equal. The polygonal counter bore is formed in the angle grinder pressing plate and is matched with the angle grinder wrench with the polygonal stud, so that a multi-surface contact structure of the polygonal counter bore and the polygonal stud is formed.

The utility model discloses an integral lifting structure of an electric medical bed, which belongs to the field of lifting structures and comprises two groups of support plates, a transverse column is detachably arranged on the two groups of support plates, and an H-shaped structure is formed between the two groups of support plates and the transverse column. According to the overall lifting structure of the electric medical bed, the supporting plate is installed on the electric medical bed, the bottom pipe penetrates through the transverse shaft of the electric medical bed in sequence, so that the supporting plate can be rapidly and integrally installed, the installing plate can be rapidly and integrally connected with the transverse plate of the electric medical bed through the two sets of installing holes, and the whole lifting structure is convenient to use. Firstly, insertion of the positioning bolt to the extension plate and the supporting plate is removed, the extension plate is pulled upwards, the overall longitudinal length of the supporting plate can be increased, then the positioning bolt sequentially penetrates through the first counter bore and the second counter bore, and the positioning nut is screwed to abut against the supporting plate.

The invention relates to a prestressed FRP (Fiber Reinforce Plastic) rib self-resetting fabricated pier structure and a construction process thereof, and the prestressed FRP rib self-resetting fabricated pier structure comprises a bearing platform, alkali-activated recycled aggregate concrete arranged in a groove in the upper surface of the bearing platform, and a prefabricated pier body arranged in the alkali-activated recycled aggregate concrete, the bearing platform, the alkali-activated recycled aggregate concrete and the prefabricated pier body are provided with through holes which are formed in the length direction and directly face each other, prestressed FRP ribs are arranged in the through holes, the first ends of the prestressed FRP ribs are anchored in counter bores in the lower surface of the bearing platform, and the second ends of the prestressed FRP ribs are anchored in counter bores in the upper surface of the prefabricated pier body; prestress is applied to the prestress FRP ribs in advance, so that the fabricated pier can recover to the initial state after being subjected to external force, the anti-seismic and anti-fatigue performance of the fabricated pier structure can be improved, the service life of the structure can be prolonged, and meanwhile energy conservation, emission reduction and sustainable development are achieved.