206results about How to "Large opening angle" patented technology

The invention discloses a cabin door opening device for a hypersonic velocity wind tunnel experiment cabin, which is suitable for opening or closing a cabin door of a wind tunnel experiment cabin. The cabin door is a circular arc-shaped turnover cover, of which the circle center of the arc is positioned on the axial center line of a cabin body of the experiment cabin when the wind tunnel experiment cabin is in a closed state; the cabin door opening device for the hypersonic velocity wind tunnel experiment cabin comprises an elastic push-pull rod; one end of the elastic push-pull rod is connected with the circular arc-shaped turnover cover by a hinge; the other end of the elastic push-pull rod is connected with a rotating arm by a hinge; and the rotating arm is connected with a power driving mechanism by a rotating arm shaft. According to the invention, the elastic push-pull rod is respectively connected with the circular arc-shaped turnover cover and the rotating arm connected with the power driving mechanism, so that an actuating mechanism is provided for opening and closing the arc turnover cover; and the arc turnover cover adopted in the invention provides an access with a wide opening angle and a large space for the experiment cabin, so that a large-scaled experiment module conveniently gets in and out of the experiment cabin, experiment efficiency of a wind tunnel experiment of the large-scaled experiment module is improved and labor intensity in the process of the wind tunnel experiment is reduced.

To hold an engine cover in a door opening state by operation of only one hand, and to ensure a large opening angle in the door opening state.A guide hole 28 made from a long linear guide portion 28A and a V-shaped guide 28B is provided on a stay guide 27 of a door opening holding mechanism 21. A first bending portion 28B1 of the V-shaped guide portion 28B is formed so as to curve along a moving track 25 when a tip end side of a stay 22 rises and falls at a position on an opposite side to the linear guide portion 28A. A second bending portion 28B2 is formed from an end portion of the first bending portion 28B1 to have a shape which is generally bent in a V-shape, and extends outward in a diameter direction of the moving track 25 in regard to the first bending portion 28B1. When the engine cover 14 is held in the door opening state, the tip end side of the stay 22 is hooked to the second bending portion 28B2 to be locked.

The invention provides an artificial aortic valve support implanted through a guide tube. The artificial aortic valve support comprises a support and an artificial valve. The support is weaved from an elastic-fiber-shaped material, is in a dumbbell structure, and comprises a head, a waist and a tail, and a layer of biocompatible film is covered on an outer surface of the head of the support, and a mounting anchor is mounted at the tail of the support. A conveying system for conveying the support is further provided and comprises an epitheca, an inner core, a loader, a push bar and a fixed head. The mounting anchor at the tail of the support is mounted on the fixed head, and the artificial aortic valve support is conveyed to an inner body through puncturing. The support is close to physiological anatomical structure and is capable of self-expanding separation, and an artificial bio-valve is adopted and is close to the functions of the artificial valve. And the conveying system can be slightly transformed from the conveying system of a heart disease stopper, so that apparatuses used for treating structural heart disease become standard and normal gradually, and meanwhile, resources are also saved and consumption is lowered.

The invention provides a surface plate running mechanism and an air-conditioner indoor unit with the same. The surface plate running mechanism comprises a surface plate (10), a first driving component (20) and a second driving component (30). The first driving component (20) is connected with the upper or middle portion of the surface plate (10), and the second driving component (30) is connected to the bottom of the surface plate (10). The surface plate running mechanism and the air-conditioner indoor unit with the same can solve the problem that the opening angle of the surface plate at an air inlet of the air-conditioner indoor unit is limited in the prior art.

The invention discloses one-time double-clamp cutting-off clamping forceps which comprise double-clamp structures, double-chuck mechanisms, clamping transmission mechanisms, cutting-off blade and cutting-off transmission mechanisms, rotation mechanisms and fixing handle mechanisms. The one-time double-clamp cutting-off clamping forceps have the advantages that two ends, with certain lengths, of each blood vessel can be accurately fixed and can be simultaneously fastened and closed, and each blood vessel with the two fastened and closed ends can be cut off from the middle; the blood vessels can be prevented from being excessively ligatured or cut, and accordingly injury on healthy tissues of human bodies can be obviously reduced; the blood vessels are fastened and cut off by the same instrument at one step, and procedures in which a surgeon extends ligature forceps into a human body at first, fastens and close two ends of a blood vessel, takes the ligature forceps out of the human body, extends a cutting-off appliance into the human body and cuts off the blood vessel can be omitted; the surgical speeds can be obviously effectively increased, and the surgical risks can be reduced; ligature clips are plastic clips with self-locking inverted fasteners, are firm and reliable and can be prevented from falling off; the ligature clips made of recyclable materials can automatically decompose in the human bodies within 6-8 months.

The invention relates to a pressure-relieving type hydraulic cutter capable of completing multi-layer cutting at a time, and belongs to the technical field of subsea wellhead abandoned well tools. According to the technical scheme of the pressure-relieving type hydraulic cutter capable of completing multi-layer cutting at a time, an upper connector is connected with a cutter body through threads; an upper center body is connected with a limiting block through threads, and the limiting block is placed in the cutter body by being in clearance fit with the cutter body; a piston is in the shape of a cross, and in contact with the upper center body through a specially-made connector, the connector is connected on the piston through threads, and a sealing rubber body is fixed on the piston through a spring baffle ring; the spring is placed in a cavity body between the piston and the cutter body; blades are connected with the cutter body through pin shafts; and a lower center body is fixedly connected on a threaded sleeve through threads, then placed in the cutter body through the threaded sleeve, and fixed through a limiting bolt. According to the pressure-relieving type hydraulic cutter capable of completing multi-layer cutting at a time, high-efficiency cutting conducted on 9-5 / 8'' to 13-3 / 8'' casings can be completed, the abandoned well operation time is saved, and thus the purpose of saving cost is achieved.

The invention discloses a valve with an articulated valve core. The valve with the articulated valve core comprises a handle, a valve rod, a valve body, the valve core, a transmission piece, a seal ring and a valve cover. The valve body is a shell body which is provided with a valve rod hole and a channel, and the channel is provided with an inlet and an outlet. The valve core is connected with the valve body through a hinge so that the valve core can rotate around a rotary axial line of the hinge, and the valve core is provided with a locking column and a connecting hole. A locking hook is arranged at the bottom end of the valve rod, and a rotary hole is formed in the bottom of the valve rod. Two ends of the transmission piece are respectively provided with a rotary head, one of the rotary heads is connected with the connecting hole of the valve core, and the other of the rotary heads is connected with the rotary hole of the valve rod, so rotary motion of the valve rod is transmitted to the valve core through the transmission piece to control opening and closing of the valve core. When the valve is in a closed state, the valve core is locked to the valve body through the locking hook and the locking column. The valve with the articulated valve core has the advantages of being compact in structure, small in opening moment of force, large in opening angle, large in flow, and the like.

The invention provides a switch mechanism, a box structure and a refrigerator. The switch mechanism is arranged on the box body structure, the box body structure comprises a box body and a door body connected with the box body, the switch mechanism comprises a driving assembly and an energy storing assembly. The driving assembly comprises a driving device and an executing device which are connected, the executing device can move under driving of the driving device, one of the energy storing assembly and the driving assembly is arranged on the box body, and the other one of the energy storing assembly and the driving assembly is arranged on the door body, and the energy storing assembly comprises an elastic component, in the working process of the switch mechanism, and the driving device drives the executing device to move towards the elastic component and make a contact with the elastic component, so that the elastic component deforms until the door body is separated from the box body.According to the switch mechanism, total process automatic door opening can be realized, the door opening angle is increased, the door opening speed is increased, and the requirement of door openingspeed in the door opening process is met.

The invention discloses a modularization positioning fixture and a positioning fixture assembly. The modularization positioning fixture comprises a pressure head, a first connecting plate, a first clamping air cylinder and a dustproof cover; one end of the pressure head is hinged to the front end of an extending rod of the first clamping air cylinder, and the middle portion of the pressure head is hinged to the first connecting plate; and the periphery of the extending rod of the first clamping air cylinder is surrounded by the dustproof cover. The modularization positioning fixture is simple in structure and small in size; moving parts are effectively protected, and the service life of the fixture is prolonged; the modularization positioning fixture is convenient to install, safe in use and high in efficiency; and standard modules are directly called, the machining period is short, the cost is low, and the opening angle of the fixture is large.

The invention discloses a multifunctional cabinet door hinge which comprises a main rotating pull rod, a main rotating connecting rod, a transmission connecting rod, a transmission pull rod, a tension spring, an inner frame base and an outer door base. An adjustable adjusting support is arranged on the inner frame base. The adjusting support is provided with a spring connecting hole. A first spring hook is arranged on the spring connecting hole. One end of the main rotating pull rod and one end of the main rotating connecting rod are connected with the adjusting support through shafts. The other end of the main rotating pull rod is connected with the transmission connecting rod, and the other end of the main rotating connecting rod is connected with the transmission pull rod. A first connecting hole is formed in the middle of the main rotating connecting rod. A second connecting hole is formed in the middle of the transmission connecting rod. The multifunctional cabinet door hinge is reasonable in structure, accurate, fast and easy to assemble, high in practicability and free of bad phenomena of noise, loosening, deformation, disengagement and the like during repeated starting.

The invention relates to a self-locking fixture clamping mechanism. A connecting plate is fixed on the base, a second clamping plate is hinged on the connecting plate through a pin shaft, a pressure head is welded on the second clamping plate, and a connecting plate is fixed on the connecting plate. The first splint, the limit column, the support block and the lower limit block, the first hinge point of the second self-locking block is hinged on the first splint through the pin shaft, and the second hinge point of the second self-locking block is connected to the first self-locking block. The first hinge point of the block is hinged through the pin shaft, the second hinge point of the first self-locking block is hinged with the rear end of the indenter through the pin shaft, the first self-locking block cooperates with the limit column, and the front end of the indenter A briquetting block is fixed, and the briquetting block cooperates with the support block. An upper limit block is fixed at the middle part of the lower surface of the pressure head, and the upper limit block cooperates with the lower limit block. The invention can realize large opening angle and clamping force without increasing the cylinder stroke, and the invention has simple structure, low cost and good stability.

The invention relates to the technical field of agricultural mechanical equipment, in particular to a strip-shaped composite planting high-ground-clearance zoning boom sprayer. The sprayer comprises a rack, a parallel four-bar mechanism, a hydraulic lifting steering mechanism, a boom mechanism and an anti-interference mechanism are arranged at the front end of the rack, and a wheel track adjusting mechanism and a hydraulic steering mechanism are arranged below the rack. A variable spraying mechanism is arranged on the rack, operation is convenient, under the action of the anti-interference mechanism, when sprayers spray pesticide, an anti-interference plate can partition the sprayers, sprayed pesticide is prevented from interfering with one another, pesticide damage caused by mutual interference of different kinds of pesticide is avoided, the variable spraying mechanism can adjust the spraying pressure and the spraying flow according to the vehicle speed under the action of a speed sensor, the spraying distribution uniformity is improved, and spraying is uniform.

The invention discloses a three-axis hinge capable of simultaneously opening and closing. The three-axis hinge is provided with a first supporting frame, a linking element, a first rotating shaft, a second rotating shaft, a second supporting frame and a third rotating shaft, wherein the first rotating shaft and the second rotating shaft are correspondingly pivoted in a first pivoting hole and a second pivoting hole of the first supporting frame; the first supporting frame is provided with an assembly space formed by two retaining walls; the assembly space is used for arranging the linking element to synchronously overturn with a first driving part on the first rotating shaft and a second driving part on the second rotating shaft; besides, the second rotating shaft and the third rotating shaft are correspondingly pivoted in a third pivoting hole and a fourth pivoting hole of the second supporting frame; the second rotating shaft can rotate around the third pivoting hole, and the third rotating shaft can obtain rotating stroke of overturning by a proper angle around the second rotating shaft.

The invention relates to a vehicle-mounted video display device. The vehicle-mounted video display device comprises a base mounted on the back of a vehicle seat. A cavity for containing a display screen is formed in the middle of the base. The base is connected with the display screen through a rotary shaft. A motor is arranged in the base. The motor is in transmission connection with the rotary shaft. The motor is connected with a control switch through a wire. The control switch is arranged on an end cover of the base. According to the vehicle-mounted video display device, the angle of the display screen is rotated through the motor, and a passenger can adjust the angle of the display screen just through the motor and the control switch.

The invention relates to a novel magnetic door stopper hinge. The novel magnetic door stopper hinge comprises a hinged shaft, a fixed hinge and a door hinge, wherein the fixed hinge and the door hinge are respectively rotationally connected to the hinged shaft; a steel sleeve is also arranged outside the hinged shaft; one end of the steel sleeve is fixedly connected to the fixed hinge; the steel sleeve is rotationally connected with an adjusting sleeve device for adjusting the suck-engagement angle between the door hinge and the fixed hinge; a magnet is arranged on the adjusting sleeve device; a suck-engagement plate which can have suck-engagement with the magnet is arranged on the door hinge; the fixed hinge comprises a door frame fixing plate and a first twist shaft sleeve; the end part of the door frame fixing plate is tangent to the first twist shaft sleeve; the door hinge comprises a door fixing plate and a second twist shaft sleeve. The novel magnetic door stopper hinge disclosed by the invention is simple and reasonable in structure; by rotating the angle of the adjusting sleeve on the fixed hinge to change the suck-engagement angle between the door hinge and the fixed hinge, the suck-engagement angle can be adjusted according to different use environments or installation environments; the novel magnetic door stopper hinge is convenient in adjustment, reliable in connection, lowered in use cost and convenient to operate.

The invention discloses a brake device of track conveying equipment. An oil cylinder is installed on a supporting frame. A lower push rod and an upper push rod are installed on two sides of the oil cylinder respectively. A guide rod frame is installed on the upper side of the oil cylinder. A spring push plate is installed on the upper push rod, and a spring is installed between the spring push plate and the guide rod frame. A press plate is installed at one end of the lower push rod. A brake rod is installed on the lower side of the press plate. A connecting rod is installed on the upper side of the press plate, and the other end of the connecting rod is connected with a rotary brake claw. The rotary brake claw is installed on the supporting frame through a rotary shaft of the rotary brake claw. The brake device of the track conveying equipment has the technical benefits that 1, the top surface and two lateral surfaces of a track can be braked simultaneously, the brake speed is high, and the brake effect is good; the rotary brake claw can hook the track, prevent a track conveying brake vehicle from disengaging from the track and prevent the brake vehicle from overturning; 2, the brake vehicle is not affected when passing through a track turnout; 3, the brake device is convenient to install and maintain.

The invention relates to an edge covering mechanism which comprises a bottom plate, a base fixed to the bottom plate, a pressing cutter and a die cavity arranged below the pressing cutter. The pressing cutter is connected with a driving device through a cutter rest, and a cutter rest support is arranged between the cutter rest and the base. An elongation part used for increasing the height of a cutter rest rotating point is arranged on the upper portion of the cutter rest support. The elongation part of the cutter rest support is in rotating connection with the middle of the cutter rest, and the lower portion of the cutter rest support is in rotating connection with the base. A locking mechanism is arranged between the cutter rest support and the base. The edge covering mechanism has the beneficial effects that the good edge covering effect and the process stability of parts of special profiles are guaranteed, and meanwhile the parts are prevented from intervening with the pressing cutter in the lifted process, so that the parts are automatically conveyed.

The invention discloses a vehicle window for emergency life escape. The vehicle window comprises a vehicle window outer frame, vehicle window glass and an inflating expansion fixing element, wherein at least one side of the vehicle window is fixedly arranged on the fixing element, an insertion groove matched with the fixing element is formed in the vehicle window outer frame, and the fixing element is arranged in the insertion groove in an embedding way, so that the installation of the vehicle window glass on the vehicle window outer frame can be realized; gas in the fixing element is exhausted, so that a gap is formed between the vehicle window glass and the vehicle window outer frame. The vehicle window has the advantages that under emergency conditions of a vehicle, so a greater moving gap can be formed between the vehicle window glass and the vehicle window outer frame through deflating the fixing element, at the time, the vehicle window opening can be realized through pushing the vehicle window, the opening is convenient, the use of a tool is not needed, in addition, the maximum opening degree can be realized, and passengers can escape from the vehicle window part to the maximum degree.

The invention discloses an automobile rotating door hinge, which comprises a fixed arm and a rotating arm, wherein the fixed arm is fixedly connected onto a door post of an automobile body; the rotating arm is fixedly connected onto the automobile body; the fixed arm is respectively provided with an arc-shaped roller guide slot and an arc-shaped limit chute; and at least two limit pits are arranged in the limit chute. The rotating arm is provided with a roller mechanism and a limit ball mechanism, wherein the roller mechanism corresponds to the roller guide slot, and the limit ball mechanism corresponds to the limit chute. The roller mechanism and the limit ball mechanism respectively do relative slip in the roller guide slot and the limit chute, and thus, the fixed arm and the rotating arm can be rotatablely and glidingly connected. According to the automobile rotating door hinge, the opening angle of the automobile door is increased to the maximum degree; the opening and closing and limit function of the automobile door is realized; the arrangement of the hinge is realized by using a smaller space, therefore, the weakening to the door post is reduced, and the strength of the door post is ensured. Castings are respectively adopted to serve as the fixed arm and the rotating arm, therefore, the cost is reduced.

The invention discloses an engine cover propping mechanism. The engine cover propping mechanism comprises an air pressure stay bar, an air pressure stay bar hinge seat and an engine cover inner plate hinge seat, wherein the air pressure stay bar hinge seat is fixed to an upper side beam of a front engine room; one end of the air pressure stay bar is hinged on the air pressure stay bar hinge seat; and the engine cover inner plate hinge seat is arranged on an engine cover inner plate. The engine cover propping mechanism is characterized by also comprising a connecting rod, a crank and a crank hinge seat, wherein one end of the connecting rod is hinged with the engine cover inner plate hinge seat and is connected with an engine cover; the other end of the connecting rod is hinged with one end of the crank; a limiting structure for limiting the connecting rod is arranged on the crank; the other end of the crank is hinged with the crank hinge seat; the crank hinge seat is fixed to the upper side beam of the front engine room and is positioned between the hinge point of the engine cover and the front engine room and the air pressure stay bar hinge seat; and the other end of the air pressure stay bar is hinged with the middle part of the connecting rod. In the engine cover propping mechanism, a force application action point of the air pressure stay bar is changed by a four-connecting-rod mechanism, so that an open angle of the engine cover is increased without selecting and using air pressure stay rods of different specifications when the stroke of the air pressure stay bar is small.

The invention discloses an open and close door of an electric oven. The open and close door features good heat insulation effect and low temperature on the cold surface, and is convenient and safe for opening. The open and close door comprises a first clamping piece (1), a second clamping piece (2), a handle (3), door panels (4) and a rotating shaft (5); wherein, the first clamping piece (1) and the second clamping piece (2) are respectively and fixedly connected with two opposite sides of the door panels (4), the first clamping piece (1) is rotatablely connected with an oven body (100) of the electric oven by the rotating shaft (5), both the first clamping piece (1) and the second clamping piece (2) are sectional materials with the same shape of cross section, the first clamping piece (1) is provided with an axle hole (10) and at least two first clamping parts (11, 12, 13), the second clamping piece (2) is provided with at least two second clamping parts (21, 22, 23), the axle hole (10) is matched with the rotating shaft (5), the first clamping parts (11, 12, 13) and the second clamping parts (21, 22, 23) are correspondingly arranged and clamped and fixed with the door panels (4) with the number being equal to the number of the clamping parts, and gasps are arranged between the adjacent door panels (4).

The invention belongs to the field of fruit processing, and particularly discloses a kiwi wine processing device comprising a frame, a stirring tank is rotatably connected to the frame, a stirring shaft is rotatably connected in the stirring tank, and a first stirring blade is arranged on the stirring shaft in the circumferential direction. The inner wall of the stirring tank is provided with spikes, and the upper part of the side wall of the stirring tank is provided with an air outlet; the kiwi wine processing device also comprises a planetary gear train, an adjusting unit and a fixing unit;the lower end of a planetary carrier extends into the stirring tank, and the portion, that protrudes into the stirring tank, of the planetary carrier is provided with a second stirring blade; the portion which is located outside the stirring tank, of the planetary carrier is fixedly connected with a cylindrical cam, the adjusting unit comprises a handle pivotally connected to the frame, and the fan gears are fixedly connected at both ends of a rocker; the fixing unit includes a first rack and a second rack, the outer wall of the stirring tank is provided with a first limiting hole matched with the first rack, and the planetary carrier is provided with a second limiting hole matched with the second rack. Requirements that kiwifruit crushing and fermentation share one device are satisfied.

The invention discloses an actuating expanding device for an automobile drum brake and the drum brake comprising the actuating expanding device, and belongs to the production field of brakes. The actuating expanding device is characterized in that two radial deep grooves which are symmetrically distributed are formed in the head end of a centre driving shaft, an axial concave arc face is formed in the bottom of each groove, a connecting rod is inserted and connected into each radial deep groove, the two ends of each connecting rod are both convex arc faces, one end of each connecting rod is in sliding fit with the corresponding axial concave arc face, the outer side of the head end of the center driving shaft is sleeved with a guiding part which is fixedly arranged, the two ends of the guiding part are respectively provided with a round guiding hole, a top rod in sliding fit with each round guiding hole is arranged in each round guiding hole, one end of each top rod is a concave arc face and in sliding fit with the convex arc faces at the outer ends of the connecting rods, and the other end of each top rod is convex arc face. A stress arc face is machined at the top end of a brake shoe of the brake and in sliding fit with the top rods. Compared with the prior art, the actuating expanding device is large in expanding angle and flexible in expanding and returning; the drum brake has the advantages of being stable in braking, short in braking distance and the like.

The invention relates to a large-scale steel bar bender. The large-scale steel bar bender comprises a workbench and a fixed arm installed on the workbench; movable arms hinged to the workbench are arranged at the two sides of the fixed arm respectively, and the two movable arms are the left movable arm and the right movable arm respectively; slide ways are formed in the movable arms, hydraulic calipers are further arranged in the slide ways, and each hydraulic caliper is connected with a first hydraulic cylinder and a second hydraulic cylinder, wherein the first hydraulic cylinder controls the opening and the closing of the hydraulic caliper, and the second hydraulic cylinder controls the operation of the hydraulic caliper in the slide way of the corresponding movable arm; third hydraulic cylinders are arranged between the fixed arm and the movable arms; a molding die is arranged on the workbench; the first hydraulic cylinders, the second hydraulic cylinders and the third hydraulic cylinders are connected with a control device. The large-scale steel bar bender has the advantages of being flexible in bending and capable of meeting the requirement of machining thick steel bars to be bent.

The invention discloses an aluminium alloy double-rotating shaft hinge of a passenger car side door, which comprises a hinge upper profile (1), a hinge lower profile (2), and a hinge connecting profile all made of aluminium profiles, wherein the hinge upper profile (1) as well as the hinge lower profile (2), comprise a decorating edge (10), a mounting edge (4), a hinge shaft outer edge (6), and an open limit bulge (7); two ends of a transition arc edge (5) of the hinge lower profile (2) is connected with middle parts of strip edges (13) respectively; hinge shafts (9) are arranged at one ends of the strip edges (13); the other ends of the strip edges (13) form open limit edges (8); the hinge shafts (9) are wrapped inside the hinge shaft outer edges (6), and the hinge shafts (9) and the hinge shaft outer edges (6) can rotate relatively; end parts of the hinge shaft outer edges (6) are arranged to be circular arc edges (11); the hinge shaft outer edges (6) and the open limit bulges (7) are connected through arc faces (12); and the open limit edges (8) are correspondingly clamped with the open limit bulges (7).

The invention discloses an adhesive tape sweeping structure which comprises a transmitting roller and a supporting drum. A knife installing shaft parallel to a rotating shaft is rotatably arranged on the rotating shaft, installed at the position of a belt rotating forwards and provided with a plurality of blades. The knife installing shaft is placed in a fixed drum, two ends of the knife installing shaft are protruded out of two ends of the fixed drum, the fixed drum is provided with an opening corresponding to the blades, the blades penetrate the opening, and blade adjusting structures are further installed between every two adjacent blades. A V-shaped blade is fixed on the supporting drum through a connecting rod and is in an arc shape matched with the outer surface of the transmitting roller, and a rolling wheel is installed on a crossed part of the V-shaped blade and is in contact with a belt on the transmitting roller in work. When faults occur in the transmitting roller, so that the belt is vibrated up and down, the rolling wheel installed on the crossed part of the V-shaped blade is in contact with the belt, the V-shaped blade can be effectively protected from damage caused by transition contact between the V-shaped blade and the conveying surface of the belt, and the service life of the belt is prolonged.

The invention relates to a novel four-link hinge assembly, which is used for connecting a car body with a car door. The hinge assembly comprises a connecting plate, a four-link hinge movable plate, a first lining rod, a second lining rod, a hinge fixed plate and a fixed plate baffle. The connecting plate is welded on the side wall stand column of the car body. The four-link hinge movable plate is connected with the connecting plate. One ends of the first lining rod and the second lining rod are movably connected with the four-link hinge movable plate. The other ends of the first lining rod and the second lining rod are movably connected with the hinge fixed plate. The hinge fixed plate is connected with the fixed plate baffle. The hinge fixed plate is fixedly connected with the car door through bolts. Compared with the prior art, the novel four-link hinge assembly has the advantages of simple structure, large opening angle, high firmness and durability, no impact, small friction, long service life and the like.

A large-angle door opening structure of a hidden fire hydrant is characterized by comprising a rotating shaft A (1), two rotating shafts B (2), and two connecting pieces (3); upper and lower ends of the rotating shaft A (1) are fixed on a wall decorative plate fixing steel frame (4); the two rotating shafts B (2) are mounted on upper and lower ends of an inner side of a decorative door (5), respectively; one end of each connecting piece (3) is pivoted to the rotating shaft A (1), while the other end of the same is pivoted to one rotating shaft B (2); a strong magnetic limiting piece (6), which is capable of sucking the connecting piece (3) to facilitate closing and positioning of the decorative door, and also capable of separating from the connecting pieces under the action of an external force to facilitate opening, is mounted on a side surface (8) of a fire hydrant chamber (7); a first limiting element (9) for preventing excessive rotation of the connecting pieces (3) is mounted on an upper or lower surface of the fire hydrant chamber (7), or the first limiting elements (9) are mounted on both upper and lower surfaces of the same; and a second limiting element (10) for guaranteeing the close state of the decorative door (5) is mounted on the upper or lower surface of the fire hydrant chamber (7), or the second limiting elements (10) are mounted on both upper and lower surfaces of the same. The large-angle door opening structure of the hidden fire hydrant is large in opening angle, and capable of reducing the installation space, and reducing the construction cost.

A clamp has a powered actuator that includes an arm moving between a first and a second position. A linkage mechanism has a link and a base. The link and base are pivotally connected with one another. The link couples with the arm of the cylinder. The bracket couples with the actuator and the base. The bracket is movable along the base for adjusting the angle opening between the link and the base.