336 results about "Transverse beam" patented technology

The present invention proposes an intermediate diaphragm-free, suspended formwork-free, and negative moment tooth block-free beam bridge, and a design method thereof. The beam bridge includes prefabricated main girders, a wet joint, lower structures, and pier cap transverse beams above the lower structures. The concrete deck slabs of adjacent prefabricated main girders are connected by the wet joint. The design method of the above beam bridge includes the following steps: S1, initial design of the main girders; S2, calculation of the non-uniform deflection of the main girders and the indirect transverse stress of the deck slabs; S3, calculation of the direct transverse stress of the deck slabs; S4, crack resistance verification of the deck slab; S5, optimization of bridge parameters to reduce the stress on the driving surface; S6, completion of the beam bridge design. The beam bridge and its design method effectively solve the problem that the existing intermediate diaphragm-free beam bridge is prone to longitudinal cracking at the joints, and realize the suspension tension without the wet joint suspended formwork of the deck slab and the negative bending moment tendon, and have better mechanical properties and better economic, environmental and social benefits, which can facilitate the promotion and application of such bridges in various types of highways , railways and municipal engineering.

The invention discloses a PIN wire steel plate lifting mechanism and a control method, and relates to a PIN wire steel plate lifting mechanism which comprises a lifting module, a grabbing and sucking module and a fixing frame. The lifting module is in linkage with a lifting driving assembly through a ball screw, and high-precision lifting is achieved. The grabbing and sucking module comprises array type vacuum suction cups, a pressure regulating valve set and an air cylinder, the stability is enhanced through a cross-shaped transverse beam frame and a cross-shaped longitudinal beam frame, and 360-degree posture adjustment is achieved by carrying a hollow platform rotating assembly. The fixing frame is connected with the sliding base, so that the mechanism moves along the linear track, and the steel plates are conveyed. The control module integrates a visual system and a laser displacement sensor, positions the position of the steel plate and a hole site in real time, scans a three-dimensional contour, detects whether the steel plate deforms on line based on a hole site and aperture comparison method, automatically triggers a sorting alarm when a detection result exceeds a threshold value, and adopts a graded pressure relief technology in a release process to ensure soft landing of the steel plate. According to the scheme, the stability of the lifting process of the PIN wire steel plate is improved, the comprehensive efficiency of a full-process automatic production line is improved, and the reject ratio of products is reduced.

A modular housing system includes a number of side beams, a number of transverse beams each spanning two or more of the side beams, at least one spine beam spanning two or more of the spanning beams, a number of isosceles angle irons provided to exterior surfaces of the side beams, a number of scalene angle irons provided to exterior surfaces of the side beams opening away from the isosceles angle irons and a number of corner support braces each coupled to one of the side beams abutting one of the isosceles angle irons.

A modular housing system includes a number of side beams, a number of transverse beams each spanning two or more of the side beams, at least one spine beam spanning two or more of the spanning beams, a number of isosceles angle irons provided to exterior surfaces of the side beams, a number of scalene angle irons provided to exterior surfaces of the side beams opening away from the isosceles angle irons and a number of corner support braces each coupled to one of the side beams abutting one of the isosceles angle irons.

Provided are a mounting rack for a battery pack, and a vehicle. The mounting rack includes a first assembly unit and a second assembly unit. The first assembly unit is disposed between two chassis beams and includes first transverse beams, first longitudinal beams, and first assembly members. Two adjacent first transverse beams and the two chassis beams located therebetween define a first accommodation cavity. The second assembly unit is disposed at a side of each chassis beam away from the first assembly unit and includes second transverse beams, second longitudinal beams, outer side beams, and second assembly members. Two second transverse beams, the chassis beam located therebetween, and the outer side beams define a second accommodation cavity. The first and second assembly members are both configured to connect the battery pack. The chassis beam is provided with at least one of the first longitudinal beam and the second longitudinal beam.

The invention belongs to the technical field of added elevators, and discloses a fast-assembly type added elevator steel structure main body and a preparation and assembly method thereof, and the fast-assembly type added elevator steel structure main body comprises a hoistway, a door frame and a corridor. The hoistway is composed of four vertical stand columns and a plurality of transverse beams, the ends of the beams are connected with the connecting faces of the stand columns through connecting pieces, each connecting piece comprises a pair of triangular pieces formed by three steel plates perpendicular to one another, a first plate is connected with the stand columns, a second plate is connected with the beams, and a third plate is an inclined strut reinforcing rib. The door frame comprises door head steel beams between the front stand columns, sill steel beams and landing door stand columns between the sill steel beams, the corridor is connected with the outer sides of the sill steel beams, and through holes in the ends of the edge beams are matched with kidney-shaped holes of the mounting bases to adjust the position. The square pipe joints of the front stand column and the rear stand column are staggered in position. The device is fast to install, stable in structure, convenient to adjust, convenient to overhaul and maintain and suitable for the elevator adding project of the existing building.

The utility model discloses a circular working well main body structure which comprises a cylindrical hollow side wall, a top plate located at the top is arranged at the upper end of the side wall, a bottom plate located at the bottom is arranged at the lower end of the side wall, #-shaped crossed internal partition walls are arranged in the internal space of the side wall, and the internal partition walls divide the internal space. And four shield launching and receiving holes are reserved in the lining wall on the inner side of the side wall. According to the utility model, the inverted circular lining wall and the enclosure structure form a superposed side wall, the support rigidity of an internal #-shaped crossed longitudinal and transverse beam (wall) system is large, and structural members are permanently and temporarily combined, so that the stability of the multi-hole structure of the ultra-deep circular working well is enhanced, and the formation deformation is effectively controlled. The longitudinal and transverse beam (wall) system is reasonable in space layout, plate span is reduced, a self-balancing space stress system is formed, the thickness of the top plate and the thickness of the bottom plate are small under the condition of large burial depth, the plate face is flat, arching is not needed, construction is convenient, and space utilization is reasonable.

An elevator car includes a support frame that is provided at the top of the elevator car, the support frame includes at least two longitudinal beams extending basically parallel to each other in a longitudinal direction (L); and at least two transverse beams attached to the longitudinal beams and extending basically parallel to each other in a transverse direction (T) that is oriented transversely, in particular perpendicularly, to the longitudinal direction (L), such that the two of the least two longitudinal beams and the two of the least two transverse beams define a working opening having predefined transverse working opening dimensions (x, y) that are independent of the dimensions (A, B) of the elevator car, the working opening allowing a mechanic to access at least one component that is located above or on top of the elevator car from inside the elevator car.

The embodiment of the invention provides a floor and a double-layer railway vehicle, the floor comprises a plurality of longitudinally arranged floor modules, each floor module comprises an upper-layer skin, a lower-layer skin and a middle-layer frame, and each middle-layer frame comprises an internal reinforcing beam and an edge sealing beam; the internal reinforcing beam comprises a plurality of cross beams and longitudinal beams which are staggered transversely and longitudinally, the cross beams and the longitudinal beams form a filling part, a foam sandwich layer and / or a carbon fiber tube core material group and a carbon fiber composite material are arranged in the filling part to realize the lightweight design of the floor, and meanwhile, the internal reinforcing beam improves the strength and rigidity of the floor and meets the use requirements; a sandwich structure is arranged in the filling part, so that the requirements of light weight and strength are met; secondly, the cross beams and the longitudinal beams at the intersection points are continuously arranged, so that the strength and the rigidity are further improved, the bearing capacity of the floor is enhanced, and the bending resistance is improved; the edge sealing beams achieve connection and sealing between the adjacent modules, and the stability of the whole structure is enhanced.

The invention relates to the field of automobile part manufacturing, in particular to an automobile seat cross beam reinforcing framework and a manufacturing method. The structure comprises a framework beam structure arranged between an automobile chassis and a seat cross beam, the structure is in a hollow beam shape with an inner cavity with two open ends, coating grooves are formed in the two sides of the upper end face and the lower end face, and SNS polystyrene foam is arranged in the grooves; the skeleton beam structure is provided with a first electrophoresis liquid tank, a second electrophoresis liquid tank and corresponding electrophoresis liquid holes, and is internally provided with a reinforcing beam; the framework beam structure is formed by a continuous fiber reinforced composite material containing polyurethane resin and a fiber reinforced body through mold closing pultrusion. The manufacturing method of the reinforced framework comprises the steps of fiber material arrangement, resin injection, pultrusion curing and the like. According to the application, the effects of reducing the weight of the seat, improving the comfort and torsion resistance of the seat, improving the electrophoresis quality, reducing the noise and vibration, realizing automatic production and improving the production efficiency and the product quality stability are achieved.

A propulsion assembly having an engine and an engine attachment which connects the engine and a primary structure of a pylon and which comprises a removable connection connecting a transverse beam and the primary structure. This removable connection has a first contact surface integral with the transverse beam, a second contact surface integral with the primary structure, at least one connection element keeping the first and second contact surfaces pressed against one another, at least one system for transmission of transverse forces between the engine and the primary structure and at least one waiting fail-safe connection distinct from each connection element and configured to generate an additional path for forces only in the event of malfunction of an element of the first removable connection.

The utility model discloses a steel frame standard weld joint structure which comprises a frame cross beam, a frame longitudinal beam is arranged on the front side of the frame cross beam, angle plates are arranged at the rear ends of the two sides of the frame longitudinal beam, and an inserting weld joint is arranged at the contact position of the frame cross beam and the frame longitudinal beam. Splicing welding seams are arranged at the contact positions of the frame longitudinal beams, the angle plates and the frame transverse beams, and first inserting openings are formed in the rear sides of the frame longitudinal beams. The first inserting openings and the second inserting openings are used in cooperation, the contact area of the frame transverse beams and the frame longitudinal beams is increased, the frame transverse beams and the frame longitudinal beams are welded to form inserting welding seams, and meanwhile under the positioning effect of the positioning assemblies, the angle plates are welded to the included angles of the frame transverse beams and the frame longitudinal beams to form splicing welding seams; therefore, the frame cross beams and the frame longitudinal beams are stably connected, and the purposes of accurate welding position, large welding area and high strength can be achieved.

This utility model discloses a fast battery swapping frame for new energy microvans, comprising: a frame body, wherein the frame body is formed by two sets of longitudinal beams and two sets of transverse beams connected together; the longitudinal beams adopt a C-shaped structure; the ends of the transverse beams are located in the C-shaped grooves of the longitudinal beams; a notch is provided at the top of the transverse beams near one end; and support plates are provided inside the transverse beams on both sides of the notch; this utility model forms a stable overlapping structure by welding the ends of the transverse beams to the C-shaped grooves of the longitudinal beams, which increases the contact area of ​​the connection parts, allowing the load generated during battery swapping to be more effectively distributed along the longitudinal beams to the entire frame body, avoiding local stress concentration, and significantly improving the overall load-bearing capacity and structural stability of the frame body.

The present invention relates to a load receiving device (1) for transporting loads (2) on a carrier vehicle (3), in particular on a rail-bound flat wagon, or for storing loads (2), - with a main frame (4) with longitudinal beams (5) and transverse beams (6), - with a twistlock locking system (7) for fixing the load receiving device (1) to the carrier vehicle (3), - with two guide rails (8) connected to the main frame (4) for a gantry crane (9), - with rail connecting pieces (10) by means of which the running rails (8) of two load receiving devices (1) can be connected to each other via a coupling and buffer area (11) of two carrier vehicles (3), - with at least one foldable or fixed detachable stanchion (12) arranged on each longitudinal end side, which in the upright position secures the load (2) stored on the main frame (4) and which in the folded-down position rests on the main frame (4). This makes transporting sleepers significantly more flexible and cost-effective.

A battery pack box includes a housing including a bottom shell and an enclosing frame, an upper cover, and a reinforcing structure including at least one longitudinal beam and a plurality of transverse beam brackets. The enclosing frame is fastened to the bottom shell and protrudes from the bottom shell. Each longitudinal beam is fastened to the enclosing frame in a length direction. Each transverse beam bracket is bent and protrudes away from the bottom shell and is fastened between one longitudinal beam and the enclosing frame or between any two adjacent longitudinal beams in a width direction. The upper cover is fastened on a top of the enclosing frame away from the bottom shell, and is affixed to the transverse beam brackets, serving to form at least a part of a floor of a vehicle frame.

The utility model relates to a riveting structure for improving the ejection force of a cross beam of a card holder, which comprises a card holder main body, the card holder main body comprises a pressing part, a cross beam and two side beams, the two side beams are arranged at an interval, and the two ends of the two side beams are respectively connected with the pressing part and the cross beam; the card holder main body is composed of a metal substrate and an outer plastic layer wrapping at least one part of the metal substrate; the metal substrate comprises a first metal piece and a second metal piece, the thickness of the first metal piece is 1-1.5 mm, the thickness of the second metal piece is 3.5-4.5 mm, and the first metal piece is riveted with the second metal piece; at least one part of the first metal piece forms one part of the pressing part and one part of the two side beams, and at least one part of the second metal piece forms one part of the cross beam. According to the utility model, the problems of insufficient beam strength and easy deformation of the conventional card holder are solved.

This utility model discloses a high-strength steel sewage treatment tank, relating to the technical field of sewage treatment tanks. It includes a main body of the sewage tank, with longitudinal beams on the outer walls of its four side edges. Multiple transverse beams are fixedly installed between adjacent longitudinal beams, and multiple diagonal tie beams and tie rods are installed between adjacent longitudinal beams. The tie rods are positioned at the top of the uppermost transverse beam, and an mounting plate is fixedly installed between the tops of two middle tie rods. A stirring rod is rotatably mounted through the bottom of the mounting plate. A sealing frame is provided on the inner wall of the sewage tank main body. This utility model, by designing a sealing frame aligned with the weld seam of the inner wall of the sewage tank main body, and then bonding a rubber strip to the outer wall of the sealing frame, and then pressing the sealing frame down with the tie rods and their load, ensures that the rubber strip on the sealing frame tightly adheres to and covers the weld seam, preventing weld seam corrosion and improving service life.

The utility model relates to a mounting structure of a watering cart, which comprises a longitudinal beam mounted on a chassis frame; the multiple cross beams are arranged in the length direction of the longitudinal beam at intervals, the cross beams are perpendicular to the longitudinal beam and penetrate through the longitudinal beam, and the two ends of each cross beam extend out of the side edge of the longitudinal beam; the upper end face of the inclined strut is provided with a curved surface transition face attached to the lower curved surface of the water storage tank, the side, away from the longitudinal beam, of the inclined strut extends to the end of the cross beam, and the lower end face of the inclined strut is welded to the upper end face of the cross beam in an attached mode. A positioning hole is formed in the upper end face, close to the side edge of the longitudinal beam, of the cross beam, and a positioning column extending into the positioning hole is fixedly connected to the lower end face, close to one end of the positioning hole, of the inclined strut. Through the arrangement of the lengthened cross beam and the inclined supporting frame, the supporting width can be increased, the outer side of the inclined supporting frame extends downwards to the end of the cross beam, the inner side of the inclined supporting frame is fixedly connected with the positioning column extending into the positioning hole in the cross beam, and the anti-side-tipping and anti-overturning strength of the inclined supporting frame on the cross beam in the outer side direction and the inner side direction can be enhanced.

This invention discloses a multi-story stacked container house system and its lateral resistance calculation method. The system includes several stacked container houses, which are arranged front-to-back and side-to-side to form a whole on the same floor. Corresponding stacked container houses on different floors are also connected to form a stacked container system. After the stacked container houses on the top floor are connected as a whole, a continuous distribution beam is fixed around the top surface of the whole. Anchors and bogies are fixed in pairs on the top surfaces of the longitudinal and transverse beams of the distribution beams. Prestressed anchor cables are connected between the corresponding anchors and bogies. Each prestressed anchor cable passes around the bogie and extends downwards, finally connecting and fixing to a pull-out member on the ground. The prestressed anchor cables generate tension on the stacked container system, improving its lateral resistance and thus enhancing its overall stability. The lateral resistance of the stacked container system can be accurately predicted using different calculation models, providing a guarantee for the safety of the stacked container system after construction in different regions, enabling the stacked container system to be applied to the construction of multi-story and mid-to-high-rise buildings.

The utility model provides a continuous conveying belt type conveying device, and relates to the field of conveying devices.The continuous conveying belt type conveying device comprises a base frame, a conveying belt, a supporting frame, a driving motor and a plurality of carrier roller assemblies, each carrier roller assembly comprises a transverse frame and a carrier roller piece, and the transverse frames are evenly and detachably installed on the base frame; the carrier roller pieces are installed on the transverse frames in a one-to-one correspondence mode, rolling cylinders are arranged at the two ends of the base frame, the conveying belt is installed at the outer ends of the rolling cylinders and the carrier roller pieces, the supporting frame is installed at the upper end of the base frame and located above the conveying belt, and the driving motor is installed on the supporting frame. The transverse beam of the carrier roller assembly is detachably connected with the base frame, when one of the transverse beam and the base frame is damaged, the damaged one of the transverse beam and the base frame can be directly replaced, the driving motor is placed on the upper portion of the conveying belt, impurities can be effectively prevented from entering the conveying belt, and the maintenance frequency is reduced.

The three-way connector double-head punching device comprises a machine frame, a blanking through groove is formed in the middle of the front portion of a top plate of the machine frame, side transverse beams extending front and back are fixed to the left portion and the right portion of the top face of the top plate of the machine frame, and horizontal guide plates extending front and back are fixed to the top faces of the side transverse beams. Vertical extending parts are formed on the top faces of the opposite wall faces of the two horizontal guide plates, the bottom face of a to-be-machined three-way connector is pressed against the top face of the top plate of the rack, and the left side wall and the right side wall of a main body of the to-be-machined three-way connector are tightly attached to or close to the inner side walls of the two vertical extending parts. The three-way connector can be inserted between the two vertical extending parts to be installed, automatic punching can be achieved, punching can be conducted on two connecting blocks of the three-way connector at a time, machining can be completed at a time, automatic discharging is achieved, the machining efficiency is high, assembling and disassembling are convenient, and the manual labor amount is greatly reduced.

The utility model discloses a front supporting leg structure which comprises a front supporting leg transverse beam, supporting seats are installed above the left portion and the right portion of the front supporting leg transverse beam respectively, reaction wheel installation seats are fixed to the left portion and the right portion of the bottom face of each supporting seat respectively, and balance beams are movably connected to the reaction wheel installation seats through hinge shafts. The front portion and the rear portion of the balance beam are each provided with a reverse rolling wheel set. The left side and the right side of a supporting seat are each provided with two reverse rolling wheel sets, the reverse rolling wheel sets are installed on a main beam, so that the stress dispersion effect on the main beam is better, the stress of the main beam is more uniform, and a first worm turbine rotation drive is fixed to the bottom of a vertical adjusting column. Automatic rotation of the first vertical lifting adjusting stud can be achieved through rotation driving of the first worm and the worm gear, automatic lifting of the supporting leg is achieved, manual operation is not needed, the operation difficulty is greatly reduced, and the manual labor amount is greatly reduced.

The utility model discloses a milling platform capable of machining a track and a guard rail, and belongs to the technical field of turnouts. Comprising a workbench, two electromagnetic clamps, a dovetail groove, a rail clamp and a guard rail machining tool, and the guard rail machining tool comprises two longitudinal beams, a plurality of transverse beams, two beam fixing structures at the two ends of the transverse beams and two workpiece fixing structures at the two ends of the transverse beams; the two longitudinal beams are magnetically attracted to the two electromagnetic clamps respectively and are I-shaped beams formed by machining rails, mortises matched with each other are formed in the connecting positions of the transverse beams and the longitudinal beams, the beam fixing structures are fixed in the dovetail grooves in the corresponding sides, and positioning steps are arranged at the left end and the right end of each transverse beam; the workpiece fixing structure is detachably arranged on the transverse beam and presses the end, away from the machining face, of the top of the guard rail. When the rail to be machined is machined, the guard rail machining tool is dismantled; when the guardrails are machined, the two guardrails are fixed to the left end and the right end of the guardrail machining tool respectively, the guardrails abut against the positioning steps, and the workpiece fixing structures clamp the guardrails.

The utility model discloses an on-line detection device for an ABS system of an automobile rear axle brake assembly, which comprises a portal frame arranged above a conveying line, a longitudinal beam capable of moving along the direction of the conveying line is arranged on the portal frame, a transverse beam capable of moving transversely is arranged on the longitudinal beam, and the transverse beam is connected to a supporting plate through a stand column. The supporting plate is connected with the detection device body through the height adjusting device and the rotation adjusting device. The detection device main body comprises a connecting device, a transmission device and a driving device, wherein the connecting device is connected with a detected brake assembly through a positioning sleeve and an extension arm; the transmission device comprises a transmission shaft connected with the positioning sleeve; the driving device is composed of a servo motor and a torque sensor. The device can perform efficient and accurate on-line detection on the ABS system of the automobile rear axle brake assembly.

This application relates to a rapid construction device and process for longitudinal movement of in-situ precast T-beams, belonging to the field of precast beam installation technology. It includes a moving platform with a clamping cavity for inserting the vertical beam of the in-situ precast T-beam; multiple self-locking casters located at the lower end of the moving platform for driving its movement on the ground; a rolling contact mechanism mounted on the moving platform, used to roll and contact the vertical beam of the in-situ precast T-beam against the other side wall of the clamping cavity when the vertical beam is contacted; and a lifting mechanism mounted on the moving platform for automatically lifting the transverse beam of the in-situ precast T-beam longitudinally off the ground while the vertical beam is clamped. This application effectively improves the problem of displacement of the in-situ precast T-beam after longitudinal movement.

The invention discloses a current collection line tower foundation embedded bolt positioning device and a construction method thereof, the current collection line tower foundation embedded bolt positioning device comprises a bearing frame, the bearing frame comprises two longitudinal beams and two cross beams, the two longitudinal beams and the two cross beams are placed on the two opposite sides of an upper port of a formwork of a tower foundation, and clamping plates are formed at the bottoms of the longitudinal beams; the cross beam is tied between the end parts of the two longitudinal beams, so that the two clamping plates are clamped at the upper port of the template; the grid frame comprises a plurality of first plate assemblies and a plurality of second plate assemblies, each first plate assembly comprises two longitudinal plates used for clamping the foundation bolts, the two ends of each longitudinal plate are installed on the two cross beams in a position-adjustable mode respectively, each second plate assembly comprises two transverse plates, one transverse plate is installed on the first plate assemblies in a position-adjustable mode, and the other transverse plate is installed on the second plate assemblies in a position-adjustable mode. The other transverse plate is arranged on the first plate assemblies in a sliding mode, the foundation bolt is screwed with an anti-falling nut, and an elastic piece used for pulling the two transverse plates to clamp the anti-falling nut is connected between the two transverse plates. The positioning method solves the problem of long positioning time of the positioning method of the embedded bolt of the fan power generation and current collection line tower foundation.

The utility model discloses an integrated hollow stamping frame of an electric motor tricycle, which relates to the technical field of tricycle frames, and comprises two longitudinal beams which are symmetrically arranged and a transverse beam which is connected between the two longitudinal beams, the front ends of the longitudinal beams are connected with inclined struts, shaft holes are formed in the inclined struts, and the transverse beam is connected with the two longitudinal beams. A straight notch is formed in the transverse beam, an adjusting seat corresponding to the position of the straight notch is installed in the transverse beam in a sliding mode, a threaded through hole is formed in the adjusting seat, and an adjusting assembly used for adjusting sliding in the length direction of the transverse beam is arranged on the transverse beam. According to the utility model, the mounting holes of different brackets and accessories can be accurately aligned, the problem of deviation of the traditional fixed mounting holes is solved, and the mounting suitability of the frame is greatly improved.

This invention provides a construction system for shallow circular silo structures, solving the problem of difficult formwork erection for the silo roof during construction. The invention includes a first outer formwork, a first inner formwork, and a silo roof frame, all vertically spaced on the ground. The silo roof frame includes radially arranged longitudinal beams and multiple arc-shaped transverse beams spaced between adjacent longitudinal beams. One end of each longitudinal beam is inserted between and detachably connected to the first outer and inner formwork. A second inner formwork is detachably connected to the top of the first inner formwork, supporting the bottom of the silo roof frame and sealing the gap at the bottom. The end of the second inner formwork furthest from the first inner formwork is fixedly connected to the lower end of the first end plate of the annular plate structure. During construction, there is no need to construct an ultra-high support system for the silo roof formwork, and the walls and silo roof can be cast integrally, saving time.

This invention relates to an error-resistant laser cutting machine tool, belonging to the field of laser cutting machine manufacturing technology. It includes a laser cutting head and a machine bed frame. A movable beam is provided between the laser cutting head and the machine bed frame. The movable beam is connected to both the machine bed frame and the laser cutting head via a transmission system. The machine bed frame includes a pair of longitudinal beams, several transverse beams, and a worktable. The machine bed frame also includes an anti-collision module and a bottom rail assembly. The anti-collision module is installed inside the longitudinal beams, and the bottom rail assembly is located below the worktable. A multi-functional air duct module is provided inside the worktable. Overall, this invention has advantages such as good heat dissipation, reducing thermal deformation and ensuring processing accuracy; good chip removal effect to avoid mis-welding with sheet metal; and good structural stability.