85 results about "Bending beam" patented technology

The invention relates to the technical field of road engineering, in particular to a DSR-based method for rapidly predicting low-temperature performance of asphalt, which comprises the following steps: preparing an asphalt cylinder sample; performing a strain amplitude scanning test to obtain a linear viscoelasticity interval; performing frequency scanning test to obtain asphalt dynamic modulus and phase angle data at different frequencies at low temperature; according to the prediction model, converting the dynamic modulus and the phase angle into a creep stiffness modulus and a creep stiffness modulus change rate; and finally, according to a low-temperature performance grade evaluation standard, obtaining the low-temperature grade of the asphalt sample. According to the method, the low-temperature performance of the asphalt can be rapidly predicted, a tedious bending beam rheometer test is not needed, and the test efficiency is greatly improved. The method also has the characteristics of low sample demand, simple operation, accurate result and the like, can be used for rapidly predicting the low-temperature performance of the laboratory asphalt, and also can be applied to asphalt extracted from a pavement core sample, so that the purpose of rapidly obtaining the low-temperature performance of the asphalt is achieved.

The invention relates to the technical field of drill rod vibration reduction, in particular to a drill rod vibration reduction device based on a bent beam semi-active nonlinear energy trap. The drill rod damping device based on the semi-active NES is suitable for deep hole machining and good in damping efficiency and comprises a connecting base, a mounting plate and NES components, and each NES component comprises a U-shaped auxiliary beam, an elastic main beam, a flexible hinge and a PID controller. Each U-shaped auxiliary beam is clamped in the corresponding annular groove, one end of each elastic main beam is fixed to the middle of a middle beam of the corresponding U-shaped auxiliary beam, the other end of each elastic main beam is fixed to the middle of the other side face of the flexible frame in the width direction, each U-shaped auxiliary beam is provided with a strain gauge, and the input end of the PID controller receives the multiple strain gauges. And the output end of the PID controller controls the plurality of piezoelectric ceramic stacks. The device is obvious in vibration suppression effect and suitable for drilling machining.

The invention relates to a MEMS component, in particular an acoustic transducer or pressure sensor, comprising: a substrate with a cavern and a mainland, an interaction element arranged above the cavern and connected to the mainland, where the interaction element is a bending beam, a boundary layer arranged at a distance from the bending beam via connecting elements, which defines a cavity with the bending beam, and a back plate located within the cavity, which is designed as a back electrode, wherein the back plate is designed to be stiffer with respect to the boundary layer and the bending beam, at least one electrode which forms a readable capacitance with a back electrode of the back plate in order to capacitively detect a deflection of at least one of the bending beam, the connecting elements and the boundary layer, at least one stop element which is designed to be displaced into a mechanical stop, wherein the stop element in the stop has at least one fluid flow resistance, in particular a fluid seal, between the cavity on a substrate-facing side and a volume on a substrate-facing side of the cavity.

The invention discloses a method for determining interlayer tensile strength of a ceramic matrix composite based on a three-point bending test. The method comprises the following steps: acquiring the geometric dimension of an original sample and determining the carbon fiber trend of the original sample; treating and bonding the bonding surface of the original sample to obtain a to-be-tested sample; the geometric dimension of the three-point bending clamp is obtained, and the placement mode of the to-be-tested sample is determined; a standard three-point bending test is carried out, and the maximum loading force in the test process is obtained; and calculating the breaking strength of the to-be-tested sample by using a three-point bending stress formula. A to-be-tested sample is prepared by bonding a plurality of original samples, a standard three-point bending test is carried out by using the to-be-tested sample, and finally, the interlayer tensile strength of the original samples is calculated by using a three-point bending beam stress expression, so that the problems that a test sample is difficult to prepare and a test result is inaccurate in an existing standard test method are solved; the efficiency and the precision of measuring the interlayer tensile strength of the ceramic matrix composite material are improved.

The invention provides a coupler force calibration method and device, and the method comprises the steps: obtaining a three-point bending beam model which is used for representing a beam structure formed by the direct connection of a coupling end of a first coupler and a coupling end of a second coupler in a coupling state, and simplifying the tail part of the first coupler into a clamped constraint, the tail of the second car coupler is simplified to be clamped constraint, and the clamped constraint limits the vertical displacement and the rotation angle of the tail of the corresponding car coupler at the same time; applying a vertical load at a preset position on the first car coupler; the bearing reaction force borne by the tail of the target car coupler under the action of the vertical load is determined, so that the calibration relation between the vertical load and the bearing reaction force of the tail of the target car coupler is constructed, and the bearing reaction force of the tail of the target car coupler is the vertical force borne by the tail of the target car coupler and transmitted at the preset position on the first car coupler; the target coupler is one of the first coupler and the second coupler. According to the invention, the accuracy of vertical load transmission calculation is improved.

A swivel bending machine has, in front of a front side of a workpiece holding unit, a support table for workpieces to be bent. A workpiece manipulator picks up workpieces to be bent from at least one table end region and takes the workpieces, in parallel with the longitudinal direction of a bending beam, to a portion in the longitudinal center of the workpiece holding unit. The workpiece manipulator has a first pair of clamping tongs and, spaced apart from the first pair in the longitudinal direction of the bending beam, a second pair of clamping tongs for clamping a workpiece. At least one pair of clamping tongs has a first stop surface for referencing workpiece positioning in relation to the longitudinal direction of the bending beam and a second stop surface for referencing positioning of this workpiece in relation to a depth direction of the swivel bending machine.

The invention relates to a gripping element for use in robotics and cobotics, wherein the gripping element (5a, 5b) is at least partially designed as a multiple bending beam (9, 19), thus enabling essentially parallel gripping and, in particular, direct measurement of the gripping force, as well as fiber reinforcement. Furthermore, the invention relates to a method for producing such a gripping element.

The utility model provides a kind of for bogie's lower bending beam and straddle type bogie frame, the lower bending beam for bogie includes: left vertical plate and right vertical plate;Lower bending beam upper cover plate;Lower bending beam lower cover plate;First sealing plate, the first sealing plate with the horizontal upper cover, horizontal lower cover, left vertical plate and right vertical plate are connected;Air chamber muscle plate, the air chamber muscle plate with the inclined lower cover, left vertical plate and right vertical plate are connected;Second sealing plate, the second sealing plate with the inclined upper cover, air chamber muscle plate, left vertical plate and right vertical plate are connected;The left vertical plate, right vertical plate, lower bending beam upper cover plate, lower bending beam lower cover plate, first sealing plate, air chamber muscle plate and second sealing plate are enclosed to form air chamber.The lower bending beam for bogie of the utility model, sets up second sealing plate and air chamber muscle plate to replace original baffle, while guaranteeing structural strength, reduce manufacturing difficulty, realize 100% detection of air chamber all welds.

A swivel bending machine and method produces a hollow fold on a sheet with a lower beam for supporting the sheet, an upper beam with a wedge-shaped bending edge for clamping the sheet between the upper beam and the lower beam, a rotatable or pivotable bending beam for bending the sheet section of the sheet protruding between the upper beam and the lower beam in a first bending step along the wedge-shaped bending edge into an acute angle, and a movement device for moving the wedge-shaped bending edge out of the sheet section pre-bent into an acute angle. The swivel bending machine further bends the sheet section into a hollow fold in a second bending step with further actuation of the bending beam between the bending beam and the lower beam, while the sheet is fixed against the lower beam by the wedge-shaped bending edge.

The application provides a straddle type bogie frame and a straddle type monorail vehicle, the straddle type bogie frame comprising a combined beam and a down bending beam, the combined beam comprising a high side beam, a low side beam, a traction beam connecting the high side beam and the low side beam, and an end beam connecting the high side beam and the low side beam, the number of the down bending beams being two, and the two down bending beams being connected with the high side beam and the low side beam respectively, and the combined beam and the down bending beam being connected in a T joint fillet welding and V type butt joint welding mode. The straddle type bogie frame and the straddle type monorail vehicle are formed by combining and welding the combined beam and the down bending beam formed in a split mode, the air chamber is independently formed in the down bending beam, the low side beam and the high side beam are decoupled, the structure is better in stress bearing, and the weld accessibility is better; the combined beam serves as a base, and when the combined beam is combined with the down bending beam, the overall welding deformation is small, the combined beam is not prone to twisting, and the size after welding is easy to control.

The invention provides a multi-curvature modeling glass curtain wall connecting structure and a construction method, and belongs to the technical field of glass curtain wall connecting structures. The multi-curvature modeling glass curtain wall connecting structure comprises a plurality of layers of curved glass sets, a plurality of stand columns, a plurality of supporting plates and a fixing assembly. The construction method of the connecting structure comprises the steps that S1, the stand columns are installed; s2, a supporting assembly is installed; s3, welding a supporting plate; s4, a limiting square pipe is welded; s5, mounting a base; s6, curved glass is installed, and a pressing plate is installed to fix the glass; and S7, a decorative cover plate is installed. According to the glass curtain wall, the gravity load of the glass is directly transmitted to the stand column through the supporting plate, a traditional cross beam structure is replaced, the permeability, continuity and integrity of the glass curtain wall are improved, the integral effect that multiple pieces of glass look like a whole piece can be achieved, the situation that a single piece of glass is oversized in specification is avoided, safety is improved, and the glass hoisting difficulty is reduced. And an arc cross beam does not need to be machined, errors caused by the arc cross beam are avoided, and cost is reduced.

The invention discloses a self-driven bistable state intelligent bracelet. The bracelet comprises a bracelet shell, and the bracelet shell is of a symmetrical nested structure formed by nesting an outer ring, an inner lantern ring, an outer fixing ring and an inner fixing ring; a flexible negative stiffness bending beam is arranged between the outer fixing ring and the inner fixing ring, and the two ends of the flexible negative stiffness bending beam are hinged to the outer fixing ring and the inner fixing ring respectively. The two ends of the outer fixing ring are each provided with a bistable power generation module, and the two bistable power generation modules are arranged in a mirror image mode. The bistable structure formed by the flexible negative stiffness bending beams can convert low-frequency and irregular mechanical energy generated by human body movement into large-amplitude transition movement, so that the friction nanometer power generation module is efficiently driven, the energy conversion efficiency under the low-frequency excitation condition is remarkably improved, the endurance problem of the bracelet is fundamentally solved, and the safety of the bracelet is improved. The method is suitable for long-term health monitoring, motion tracking and other scenes.

Elastic bearing (10), in particular for suspending a load, comprising: at least one elastic body (12) having at least two bending beams (14, 16, 18, 20) and at least two receiving openings (26, 28) for receiving coupling elements, wherein at least one of the at least two bending beams (14, 16, 18, 20) is connected to at least one joint section (22, 24), and at least one reinforcement (30) which is embedded in the at least one elastic body (12), wherein the reinforcement (30) extends at least into the at least two bending beams (14, 16, 18, 20), wherein the reinforcement (30) extends at least substantially rectilinearly in the at least two bending beams (14, 16, 18, 20) in at least one predetermined section (d) of the respective bending beam (14, 16, 18, 20), wherein the at least two bending beams (14, 16, 18, 20) each have at least one support point (36, 38, 40, 42) which ensures the at least substantially rectilinear course of the reinforcement (30) in the predetermined section (d),wherein the at least one reinforcement (30) is a thread reinforcement, a textile reinforcement or a wire reinforcement, and wherein the elastic body (12) has a notch at at least one of the support points (36, 38, 40, 42), and wherein the reinforcement (30) does not change its direction at the support points (36, 38, 40, 42).

A bending machine (1) comprises: a bend beam (30) that bends a workpiece (W) held between a bottom die (15) and a top die (25) along a bending line extending in the left-and-right direction; and a back-and-forth movement mechanism (50) for deforming the bend beam (30) in the back-and-forth direction. The back-and-forth movement mechanism (50) has a middle linear motion part (50M) that moves the bend beam (30) in the back-and-forth direction along a middle drive axis (AM), and a left linear motion part (50L) that moves the bend beam (30) in the back-and-forth direction along a left drive axis (AL) parallel to the middle drive axis (AM). The bend beam (30) comprises cut-out parts (37n) that are formed so as to cut out portions of the bend beam (30) and that are provided between the middle drive axis (AM) and the left drive axis (AL).

The invention relates to the technical field of medical instruments, in particular to a supporting skeleton, a covered stent mechanism and a covered stent conveying and releasing system.The supporting skeleton comprises a supporting ring and a bent beam which are connected in sequence, and the bent beam is arranged at one end of the supporting ring in the central axis direction of the supporting ring and bent towards the inner side. Therefore, the support skeleton provided by the invention is provided with the bent beam which can be used as a guide rail, the support ring is guided into the outer sheath tube, and the forward thrust of the outer sheath tube is converted into the radial pressing and gripping force and the axial forward thrust to the covered stent, so that the covered stent is collected into the sheath tube of a conveyor section by section, and when the anchoring position and the window alignment are inaccurate, the covered stent can be accurately positioned. The covered stent can be recycled into the sheath tube of the conveyor, the position and the angle of the covered stent can be adjusted, the covered stent is released again, the operation is repeated until the position of the stent is satisfactory, and the application difficulty and risk of the intracavity repair technology are reduced.

Revealed is a microelectromechanical (MEMS) oscillator, comprising: a first component; a movable component which is mounted so that it can move relative to the first component, at least in a first direction; wherein the movable component assumes a stop position relative to the first component when the deflection is sufficiently large, wherein the movable component touches the first component at least at a first stop point in the stop position; at least one actuator component, which is designed as a bending beam clamped at both ends with a beam longitudinal axis running perpendicular to the first direction, wherein the at least one actuator component is designed to selectively assume an undeformed configuration as well as a deformed configuration, in which the at least one actuator component is deflected at least partially perpendicular to its beam longitudinal axis, depending on an activation; wherein at least one actuator component is designed to transmit a force between the first component and the movable component in the deformed configuration when the movable component is in the stop position.

A MEMS component. The MEMS component includes: a substrate having a cavity and a base, an interaction element arranged above the cavity and connected to the base, including a bending beam, a boundary layer at a distance from the bending beam via connecting elements and defining a hollow space with the bending beam, and a backplate within the hollow space, the backplate being stiffer in relation to the boundary layer and the bending beam, at least one electrode, which forms a readable capacitance with a back electrode of the backplate, to capacitively detect a deflection of at least one of the bending beam, the connecting elements and the boundary layer, at least one stop element, configured to be displaced into a mechanical stop.

The utility model discloses an inner tube wiring structure of an electric tricycle, which relates to the technical field of inner tube wiring structures and comprises a middle beam, a bent beam fixedly connected to one side of the middle beam, a dismounting unit arranged in the middle beam and a limiting unit arranged in the bent beam. The dismounting unit comprises a metal plate arranged on one side of the middle beam, a connecting assembly arranged on one side of the metal plate and a bearing assembly arranged in the middle beam. The limiting unit comprises a communication block arranged at the top end of the bent beam, a wire harness outlet formed in one side of the bent beam, and a limiting assembly arranged in the bent beam. According to the inner pipe wiring structure of the electro-tricycle, the metal plate is driven to be separated from the middle beam by disassembling the locking bolts, so that wiring harnesses can be arranged and then continuously pushed, the wiring harnesses do not need to be drawn out and fed in again, and the fixing stability of the various wiring harnesses is improved.

Forklift truck with a force measuring device, wherein the force measuring device is designed as a bending force measuring device (2) and additionally - at least partially - as a chassis component, characterized in that the bending force measuring device (2) has at least one elastically bendable element, wherein the bendable element is designed as a bending beam, wherein the bending beam forms a measuring section (2a, 2b, 2c, 2d) on which .Deformations caused by bending loads are measurable, wherein the bending force measuring device (2) is designed as a support body with integrally formed pendulum pins (P1, P2) for suspension on a vehicle, wherein a continuous horizontal transverse recess (Q1; Q2) is incorporated adjacent to each pendulum pin (P1; P2), which is bounded above and below by a measuring section (2a; 2b; 2c; 2d), wherein the bending force measuring device (2) has at least one measuring sensor (M1; M2; M3; M4) with which a bending of the at least one elastically bendable element can be measured, and the at least one measuring sensor (M1; M2; M3; M4) is arranged in the transverse recess (Q1, Q2) of the bending force measuring device (2).

The invention discloses a design method of a lithium niobate film phase modulator with a high polarization extinction ratio, and belongs to the field of integrated optical gyroscopes. The method comprises the following steps: firstly, designing a lithium niobate film phase modulator comprising a silicon substrate, a silicon dioxide cladding, a lithium niobate film optical waveguide core layer and a modulation electrode; the double-layer conical gradient waveguide meeting the TE mode light fundamental mode transmission condition couples light into a chip, and polarization of a transmittable light mode is limited by designing the width and the thickness of the waveguide; the effective refractive index, the bending radius, the waveguide width and the center distance are designed for the directional coupling unit, and polarization is generated through phase matching polarization beam splitting; the multimode interference coupler is polarized by designing the length and width of a multimode interference region; the bending beam splitting unit is polarized by designing bending radius leakage; finally, through an electric field generated by a modulation electrode, the light is subjected to phase change, and two beams of light with phase difference are output; according to the invention, a high polarization extinction ratio is realized on the basis of a basic beam splitting modulation function.

The application provides a programmable energy barrier fast-response bistable mechanical gripper and a use method, and belongs to the technical field of robots. In the gripper, rigid clamping jaws are fixed to the side of a fixed clamping plate, the fixed clamping plate is rotatably installed on the upper end of a sliding block around a pin shaft, and a flexible bending beam is arranged in the gap of the fixed clamping plate. The sliding block is fixed to a rack, and the rack is engaged with a gear in a box. When a driving motor is driven, a rocker arm pushes the sliding block to move along a guide shaft, and through the transmission conversion of the rack-gear-rack, reverse displacement of the opposite sliding block is generated, reverse movement of the two sliding blocks is realized, the fixed clamping plate rotates around the shaft, and the flexible bending beam is bent under pressure. The process can adjust the threshold of the energy barrier of the bistable structure and change the trigger condition. After being impacted by an object, the gripper can quickly jump and actively increase the holding force. The application has the advantages of adjustable energy barrier, simple structure, fast response, low cost and the like, and solves the problem that the existing mechanical gripper cannot simultaneously realize soft trigger and stable clamping.

The application relates to a magnetic-force-electric coupling energy collector and method based on an asymmetric torsional mode, and belongs to the technical field of energy collection. The application comprises a piezoelectric sheet, an asymmetric bending beam structure, a mass block and a fixing screw rod; the polarization direction of the piezoelectric sheet is arranged along the thickness direction, and electrode coatings are arranged on both sides of the piezoelectric sheet along the thickness direction; the electrode coatings on both sides are defined as an adhesive electrode surface and a lead-out electrode surface respectively; the asymmetric bending beam structure comprises a main beam, a long limb and a short limb arranged in an integrated structure; the middle part of the main beam is provided with a fixing hole; the adhesive electrode surface is fixedly connected with the main beam through epoxy resin and is distributed on the left and right sides of the fixing hole; the lead-out electrode surface leads out electric signals through a wire; the mass block is fixed on the asymmetric bending beam structure through magnetic force; one end of the fixing screw rod is connected with the fixing hole; and the fixing screw rod is installed on a rigid base.

The present invention discloses a unidirectional self-bending beam generator based on a visible light binary metasurface. The unidirectional self-bending beam generator includes an upper optical metasurface and a lower optical metasurface that are parallelly placed and have a subwavelength thickness, wherein: both the upper optical metasurface and the lower optical metasurface are composed of 81 binary subwavelength units, and there is a certain air gap between the upper optical metasurface and the lower optical metasurface. The present invention encodes the units with opposite transmission phases using the numbers 0 and 1. By parallelly placing two subwavelength optical metasurfaces with different coding sequences, and utilizing the different transmission phase responses on both sides of the double-layer structure, a TM incident wave with a wavelength of 650 nm can be unidirectionally converted into a self-bending beam, while promoting the miniaturization and integration of optical devices, and greatly simplifying the design and fabrication process of the device.

The invention relates to an electret atomic force microscope bending beam for measuring surface potentials and / or surface properties by means of an atomic force microscope, comprising a bending beam having a bending beam tip, characterized in that at least the bending beam tip is coated with a thin electret layer.

The invention discloses a small-size low-rigidity iron-gallium magnetostriction driving module and an underwater acoustic transducer. The iron-gallium magnetostriction driving module comprises an iron-gallium bent beam, a driving coil, a permanent magnet and a high-permeability transition block, the iron-gallium bent beam comprises a main beam, an auxiliary beam and fixed end blocks which are integrated, the main beam and the auxiliary beam are arranged in parallel, the two ends of the main beam and the two ends of the auxiliary beam are connected through the fixed end blocks, the fixed end blocks downwards extend out of beam feet, and the beam feet exceed the lower edge of the auxiliary beam and serve as the open end and the tail end of a magnetic induction line of a conduction bias magnetic field. A boss is upwards arranged in the middle of the main beam, and a connecting hole is reserved in the middle of the boss; the driving coil comprises main beam coils and auxiliary beam coils, the main beam coils are wound on the main beams on the two sides of the boss respectively, and the auxiliary beam coils are wound on the auxiliary beams. According to the driving module, through the low-rigidity bending mode design and the dynamic and static separated magnetic circuit design, the double breakthrough that the resonant frequency of the underwater acoustic transducer driving part body is greatly reduced and the height size is synchronously reduced is achieved.

1. The name of the design product: the basket of goods in the car with the bending beam (including the mobile phone box). 2. The use of the design product: for placing goods. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The invention discloses a method for predicting dynamic characteristics of a drilling riser in an ultra-deep water free standing mode, which comprises the following steps of: establishing a two-dimensional coordinate system by taking a submarine blowout preventer as an original point, and establishing a fluid infinitesimal and riser infinitesimal mechanical equilibrium equation according to the Alembert principle; in consideration of environmental loads generated by waves, ocean currents and wind and buoyancy generated by a buoyancy barrel on the top of the riser, a classical bent beam theory is adopted to deduce a transverse differential equation of the riser in the ultra-deep water free standing mode, boundary conditions of a dynamic behavior prediction model of the riser in the ultra-deep water free standing mode are determined, and a finite element method is adopted to predict the dynamic behavior of the riser in the ultra-deep water free standing mode. An equation is solved by combining a Newmark-beta integral method, a dynamic behavior prediction model of the marine riser in the ultra-deep water free standing mode is finally established, and the dynamic characteristic behavior of the marine riser in the mode can be clearly predicted.

A micromechanical component for a sensor or microphone device, including a substrate, a frame structure, which is situated on the substrate surface and / or at least one intermediate layer, and a diaphragm, which spans an inner volume, which is at least partially framed by the frame structure. The micromechanical component includes a bending beam structure, which is situated in the inner volume and includes at least one anchoring area, which is attached to the frame structure, to the substrate surface and / or to the at least one intermediate layer, and at least one self-supporting area, which is connected via at least one coupling structure to the diaphragm inner side of the diaphragm in such a way that the at least one self-supporting area is bendable by way of a warping of the diaphragm.

The embodiment of the utility model provides a connecting seat of an aerial work platform, and relates to the technical field of aerial work. The connecting seat of the aerial work platform comprises a swing cylinder mounting part, a transition connecting part and a hanging basket mounting part which are sequentially arranged, the transition connecting part is used for supporting a hanging basket together with the hanging basket mounting part, and the transition connecting part comprises a connecting beam which comprises a first bent plate; the first bent plate comprises a first supporting plate and a second supporting plate which are connected at an included angle and integrally formed, the second supporting plate is used for abutting against the bottom of the hanging basket and is connected with the hanging basket mounting part, and the connecting beam is a box type bent beam. The box-type connecting beam can improve the bending resistance of the connecting beam and can also improve the torsional rigidity, and the first supporting plate and the second supporting plate are integrally formed, so that the strength of the first bending plate is ensured, and the stability of the hanging basket connected with the connecting seat during high-altitude operation can be ensured.

The utility model belongs to the technical field of bridge girder erection machines, and provides a rail beam displacement integrated bridge girder erection machine middle support which comprises a middle supporting leg, a movable hanging beam and a bracket, the middle supporting leg is located above a transverse rail, the middle supporting leg comprises a bent beam and a movable hanging frame, the middle of the bent beam is concave downwards to be close to the top of the transverse rail, and the movable hanging frame is arranged on the middle supporting leg. The two ends of the camber beam are lifted upwards, a space for installing the electric walking wheels is formed between the two ends of the camber beam and the transverse rails below the camber beam, and the two movable hanging brackets are arranged above the two ends of the camber beam correspondingly so that the two movable hanging brackets can be hung on the corresponding longitudinal main beams, and the movable hanging brackets can move in the length direction of the longitudinal main beams; and the movable hanging beam is transversely arranged right above the middle supporting leg. Integrated synchronous displacement of the middle supporting leg and the transverse rail can be achieved, the operation process is simple and convenient, working efficiency is high, deviation of the position of the transverse rail after the transverse rail is lowered does not need to be worried, the correct transverse moving direction of the middle supporting leg is guaranteed, and working quality is high.