33results about How to "Reduce disconnection" patented technology

The embodiment of the utility model relates to a solar cell and a solar module. The solar cell comprises a cell substrate, a first grid line, a second grid line, a first end bonding pad, a second end bonding pad and a lapping line, wherein the first grid line and the second grid line are opposite in polarity. The battery substrate includes a first edge and a second edge opposite in a first direction and a third edge and a fourth edge opposite in a second direction. At least part of the first grid lines and at least part of the second grid lines are alternately distributed in the second direction. The first end portion bonding pad is the bonding pad closest to the third edge among all the bonding pads adjacent to the first edge. And the second end part bonding pad is the bonding pad closest to the third edge in all the bonding pads adjacent to the second edge. And the lapping wire is lapped with the adjacent first grid line after being connected with the first end bonding pad, and forms an accommodating area with the adjacent first grid line on the surface of the battery substrate. The second grid line adjacent to the adjacent first grid line comprises a bending section which is bent into the accommodating area. The first gate line between the second end pad and the third edge extends only in the first direction.

The invention provides polyacrylate alkali-soluble resin as well as a preparation method and application thereof. The polyacrylate alkali-soluble resin has a structure as shown in a general formula (VI). According to the polyacrylate alkali-soluble resin provided by the invention, the six-membered cyclic anhydride with a rigid structure is introduced into a main chain, and the characteristics of the rigid structure and ester groups of the cyclic anhydride are utilized, so that the etching resistance and the adhesion to a copper substrate can be effectively enhanced, and the problems of short circuit and open circuit in a circuit board manufacturing process are reduced; the photosensitive dry film prepared from the photosensitive resin composition has the advantages of excellent adhesive force, high resolution ratio, high film stripping speed and no large film residue residue.

The utility model discloses a wire guide mechanism capable of reducing a wire outlet angle and a fishing reel thereof. The wire guide mechanism comprises a wire guide and a transmission lead screw, a wire guide hole is formed in the wire guide gauge; the transmission lead screw comprises a screw rod and a nut capable of translating along the screw rod in a reciprocating manner; the device further comprises a swing arm and a swing support, the tail end of the swing arm is rotationally connected with the nut, the lead gauge is connected to the upper side of the head end of the swing arm, and a hinge point is further arranged between the head end and the tail end of the swing arm. The swing support is fixedly arranged relative to the position of the transmission lead screw, and the swing arm is rotationally connected with the swing support through a hinge point. When the nut of the transmission lead screw moves along the screw rod, the swing arm can be driven to rotate around the circle center of the hinge point, so that the wire guide can swing. According to the fishing reel, the swinging arm is arranged, the position of the guide wire gauge can be extended through the swinging arm, the guide wire gauge is made to be far away from a wire cup of the fishing reel, and therefore the angle of appearance and take-up of the fishing reel is effectively reduced, and the possibility that a fishing wire is broken in the using process of the fishing reel is reduced.

The invention relates to the technical field of home control, and discloses an intelligent home control system and method, and the system comprises a unified communication protocol module which provides a unified communication protocol and standard, supports the interoperability of intelligent equipment, supports the communication protocols including WiFi, Bluetooth and Zigbee, and achieves the seamless connection and control between the equipment through a central controller. According to the invention, a unified communication protocol is used, mutual connection and control between intelligent devices are ensured, interoperability and expansibility of the system are enhanced, the intelligent devices can be automatically identified and connected to the central controller through the intelligent installation and automatic configuration module, the installation process is simplified, the operation complexity of a user is reduced, and the user experience is improved. The central controller supports data encryption and user identity verification mechanisms, protects the safety of equipment communication and user data, and prevents information leakage and unauthorized access.

According to the processing device for the building construction bricks, a cutting line is installed between a lower line winding wheel and an upper line winding wheel in a winding mode, the rotating direction of the cutting line is opposite to that of the lower line winding wheel, and the winding amount of the cutting line on the upper line winding wheel or the lower line winding wheel is smaller than one circle; according to the processing device for the building construction bricks, the upper rotating drive and the lower rotating drive respectively drive the upper rotating shaft and the lower rotating shaft to rotate, then the linear cutting assembly can complete the cutting action, linkage is formed between the upper rotating drive and the lower rotating drive, the situation that rotation between the upper rotating drive and the lower rotating drive is not synchronous is avoided, and the processing efficiency is improved. The risk of accidents in the work of the cutting line is reduced; the upper transverse driving part and the lower transverse driving part can respectively drive the upper mounting plate and the lower mounting plate to move in the length direction, so that a non-linear brick body can be processed; the winding amount of the cutting line on the upper winding wheel or the lower winding wheel is smaller than one circle, compression cannot be formed, and the possibility of line breakage is reduced.

The utility model relates to the technical field of connection of electric locomotives and mine cars, and particularly discloses a collision plug pin self-locking structure of a mining electric locomotive, which comprises a mounting seat, indicating lamps are fixedly connected to the left side and the right side of the mounting seat, a connecting plate is fixedly connected to one side wall of the mounting seat, and a plug pin main body is fixedly connected to one side wall of the connecting plate. The hook is movably connected with the bolt body to form a primary connection structure, and a driving motor, a rotating shaft, a sliding block, a moving plate, a meshing gear, a connecting rod, a connecting ring, a fixing rod and a limiting block in the self-locking mechanism cooperatively operate. When the bolt is inserted in place, the driving motor is started, the sliding block is driven to move through the rotating shaft, then the movable plate acts, the meshing gear is meshed with the clamping tooth plate, the connecting rod and the fixed rod are pushed to move, the limiting block is clamped into the outer wall of the connecting block, firm self-locking is achieved, and the bolt is effectively prevented from loosening and falling off due to vibration and jolt in the running process of the electric locomotive. The probability of occurrence of safety accidents such as mine car disjunction is greatly reduced, and underground transportation safety is guaranteed.

The utility model relates to the technical field of energy storage electric connection, in particular to a non-rotatable plug-in type energy storage connector and an energy storage connector assembly, which comprise a shell, a plug keycap and a first power connection element, and the shell comprises a plug part and a wiring part; the inserting part is provided with an inserting cavity, an inserting sleeve is arranged in the inserting cavity, one end of the inserting sleeve is provided with a butt-inserting end, the butt-inserting end is provided with a rotary limiting table, and the side, located on the rotary limiting table, of the butt-inserting end is provided with a rotation stopping inserting groove; the plug keycap is provided with a rotation stopping connecting end and a plugging end, the rotation stopping connecting end is provided with a rotation limiting buckle, the plug keycap is clamped on the rotation limiting table through the rotation limiting buckle, and the rotation stopping connecting end is provided with a rotation stopping bolt. According to the utility model, the plug keycap is fixed after being inserted and assembled, the plug keycap cannot rotate after being fixedly inserted, and the angle can be adjusted at will during assembly, so that the convenience of insertion and the adjustment and fixation at any angle are ensured, and the application range is wide.

The invention discloses a device and a method for preparing a metal sewing thread for a sewing machine, a sewing thread and a special sewing machine, designs a pure metal sewing thread formed by twisting and annealing seven superfine stainless steel monofilaments, adopts the special sewing machine, and can realize machine sewing; in the metal sewing thread preparation device, a whole set of sewing thread production equipment is designed, the phenomenon of thread breakage in the production process can be effectively reduced, and meanwhile the flexibility of the sewing thread is improved through annealing equipment. A special metal sewing thread guide device is designed on the sewing machine for the metal sewing thread, so that the special metal sewing thread guide device can be matched with the up-and-down moving stroke of the sewing thread, and automatic sewing of the metal sewing thread is achieved. According to the design, not only are the flexibility and strength optimization of the metal sewing thread achieved, but also automatic sewing of the pure metal sewing thread on a sewing machine is achieved.

This invention relates to the field of goods storage scheduling technology, and discloses an intelligent scheduling system and method for goods storage inbound and outbound operations. The method includes acquiring a real-time distribution feature set and a historical scheduling feature set of goods in a target warehouse. The real-time distribution feature set includes spatial distribution and morphological feature sets of goods, while the historical scheduling feature set includes historical spatial distribution and morphological feature sets. A scheduling sensitivity matrix is ​​generated by comparing the two types of real-time feature sets with their corresponding historical feature sets. A dataset of warehouse location movement trajectories matching this matrix is ​​retrieved. When the dataset dispersion reaches a dispersion threshold, the scheduling time percentage from the initial inventory time to the current scheduling time is calculated. A warehouse location reorganization instruction set is generated based on this time percentage. This method combines real-time and historical data to optimize warehouse location trajectory planning and warehouse location reorganization, adapting to complex warehousing scenarios and improving the level of scheduling intelligence.

This utility model relates to the field of relay technology, and provides an anti-arc safety relay for charging piles, including a relay housing and a coil installed at the center of the bottom of the housing; an iron core, which is slidably inserted into a through hole running vertically through the center of the coil; a transmission column, which is installed at the top of the iron core; a moving contact assembly, which is installed at the top of the transmission column; and two arc-extinguishing components, which are symmetrically installed on the left and right side walls near the top of the relay housing. This anti-arc safety relay for charging piles, through the scientific layout of multi-layer arc-extinguishing grids, a fast-rebound disconnection mechanism, and a buffer reset design, can effectively suppress and quickly eliminate the arc generated between the moving and stationary contacts, significantly improving the safety performance and service life of the relay.

The invention discloses a projection screen display method and system, a terminal and a medium, and the method comprises the steps: building a projection screen connection through a transmitting end, and transmitting the projection screen content to a receiving end; and after the receiving end receives the screen projection content, dividing a display screen of the receiving end into a first area and a second area according to the screen projection content, displaying the screen projection content in the first area, and displaying the content of a local window of the receiving end in the second area. According to the invention, the screen of the receiving end is intelligently divided into two independent areas for respectively displaying the screen projection content and the local window content of the receiving end, so that the problem that the screen projection picture and the local interface cannot be simultaneously displayed on the same screen is solved, the user experience is enhanced, and the working efficiency is improved.

The invention discloses a cutting fluid for a semiconductor material and a preparation method thereof, and relates to the technical field of cutting fluids. The semiconductor material provided by the invention is composed of the following raw materials: 0.001-30.00 parts of a water-soluble lubricant; 0.001 to 30.00 parts of an anti-wear lubricant; 0.001 to 20.00 parts of an extreme pressure lubricant; 0.001 to 50.00 parts of a special wetting agent; 0.001 to 30.00 parts of an emulsifying dispersant; 0.001 to 90.00 parts of an antirust agent; 0.001 to 90.00 parts of a corrosion inhibitor; 0.001 to 10.00 parts of a bactericide; 0.001 to 50.00 parts of a settling agent; and 0.001 to 99.00 parts of deionized water. The prepared cutting fluid for the semiconductor material has high permeability and high lubricity, the surface quality of slices is high, the warping degree is low, and the cutting efficiency and the yield are improved.

A display device includes: a substrate having a display area including a plurality of sub-pixels and a non-display area outside the display area; a thin film transistor in each sub-pixel, the thin film transistor including a gate electrode, a source electrode, and a drain electrode; first and second intermediate layers sequentially on the thin film transistor; a light emitting element on the second intermediate layer, connected to the thin film transistor and including a first driving electrode, an electroluminescent layer, and a second driving electrode; a lower connection line in the non-display area; a bank layer on the lower connecting line; a power line connected to the second driving electrode through a lower connection line; at least two weirs on the power line, each including a first intermediate layer, a second intermediate layer, a bank layer, and a spacer, and the first and second intermediate layers of the at least two weirs being separated from the first and second intermediate layers in the display area; a fracture detector surrounding the at least two weirs in the non-display area; and an encapsulation layer on the light emitting element, including first, second, and third encapsulation layers.

This invention relates to a method for uniform stress distribution during the winding of irregularly shaped springs in the field of information technology. The method includes: analyzing historical winding data using machine learning algorithms to establish a tension adjustment model for rapid shape change, predicting the stress distribution of the wire during the initial winding stage after shape change, dynamically adjusting the response speed of the servo motor based on real-time tension data to reduce tension adjustment lag; optimizing the servo motor control strategy using reinforcement learning algorithms based on the winding stress distribution prediction model to make the tension distribution of the wire more uniform during the winding process; determining whether the stress distribution of the wire meets a preset standard; and further adjusting the control parameters of the servo motor if it does not.

This application provides a mobile call method and an electronic device, which relate to the field of communication technologies and can reduce a possibility that a mobile call is disconnected by mistake and improve call experience of a user in a process in which two electronic devices perform the mobile call by using a preset call function. The method is applied to a first electronic device, and the first electronic device establishes a first wireless communication connection with a second electronic device. The method includes: establishing, by the first electronic device, a mobile call connection with a third electronic device and performing a first mobile call with the third electronic device by using the mobile call connection; when a preset call function is enabled, supporting, by the first electronic device by using the mobile call connection and the first wireless communication connection, the second electronic device to perform a second mobile call with the third electronic device; and in response to a first event, stopping supporting, by the first electronic device, the second electronic device to perform the second mobile call with the third electronic device, and performing a third mobile call with the third electronic device by using the mobile call connection.

The application discloses an electrochromic device and a terminal product. The electrochromic device comprises an electrochromic element, a first bus bar, a first conductive part and a first adhesive structure. The edge stack of the electrochromic element is arranged around the center stack. The edge stack is provided with a first groove. The first groove penetrates the first base layer, the first conductive layer and the electrochromic layer of the electrochromic element, so that the second conductive layer is exposed. The first bus bar is at least partially arranged in the first groove and is insulated from the wall surface of the first groove. The first conductive part is arranged in the first groove and connects the first bus bar and the second conductive layer. The first adhesive structure is at least partially arranged in the first groove. The first adhesive structure connects the first bus bar with at least one of the center stack, the second conductive layer and the first conductive part in the first groove. The electrochromic device provided by the application realizes double fixation of the first bus bar and the second conductive layer, and reduces the risk of the first bus bar falling off from the surface of the second conductive layer.

The utility model relates to the technical field of energy storage electric connection, in particular to a rotatable plug-in type energy storage connector and an energy storage connector assembly, the rotatable plug-in type energy storage connector comprises a shell, a plug keycap and a first electric connection element, the shell comprises a plug-in part and a wiring part, and the wiring part is arranged at one end of the plug-in part; the inserting part is provided with an inserting cavity, an inserting sleeve is arranged in the inserting cavity, one end of the inserting sleeve is provided with a butt-inserting end, and the butt-inserting end is provided with a rotary limiting groove; the plug keycap is provided with a rotary connecting end and a plug-in end, the rotary connecting end is provided with a rotary limiting buckle, and the rotary connecting end is rotatably arranged at the plug-in end and is rotatably connected with the rotary limiting groove through the rotary limiting buckle; the first power connection element is arranged in the shell. According to the utility model, through the design of the plugging sleeve and the plug keycap, the connector can realize rotary connection, so that connection and disassembly are more convenient. The connection stability and reliability are improved, the connection operation is simplified, and more convenient connection operation is provided.

The invention relates to the technical field of spinning equipment, in particular to an efficient spinning thread stand which comprises a base, the base is movably sleeved with a plurality of fixing frames, each fixing frame comprises a bottom plate, electric telescopic rods are symmetrically arranged on the left side and the right side of the top of each bottom plate, vertical plates are fixedly connected to the top ends of the electric telescopic rods, and two fixing plates are fixedly arranged between the vertical plates on the two sides. The two fixing plates are arranged in an up-and-down and front-and-back staggered mode, a plurality of wire hoop fixing cylinders are evenly and rotatably arranged on the two fixing plates, a synchronous rotating device is arranged between the two fixing plates, and the wire hoop fixing cylinders are connected with the synchronous rotating device; a tension control assembly is further arranged on the right side of each wire hoop fixing cylinder, and a wire frame is arranged on the vertical plate on the right side. According to the spinning thread stand, the thread hoop fixing cylinders on the two fixing plates are driven to rotate synchronously through the synchronous rotating device, the working efficiency and the product quality can be improved, the occupied area of the device can be reduced, the automation degree is high, and the application range is wide.

The invention relates to the technical field of chip processing and packaging, and discloses packaging equipment for MOS chip processing and a use method thereof.The packaging equipment comprises a bottom supporting table, the top of the bottom supporting table is fixedly connected with a packaging table, and the top of the bottom supporting table is fixedly connected with an electric push rod; an outer filter screen on the surface of the protective ring frame is utilized, so that the condition that dust particles in the external environment are in contact with the MOS chip in the preheating process is reduced, and dust accumulation generated during filtering on the surface of the outer filter screen is cleaned; meanwhile, hot air is blown to the surface of the packaging table along the inner side of the inner connecting cylinder through the rotating transmission fan, the MOS chip on the surface of the packaging table can be preheated conveniently, the adhesive force between the MOS chip and the packaging material is improved, the temperature of wind power generated by the rotating transmission fan at the moment is low after a heater body is turned off during cooling after curing, and the temperature of the wind power generated by the rotating transmission fan is lowered. And in cooperation with the continuously rotating bottom connecting frame, the cooling efficiency of the MOS chip packaged and cured on the surface of the packaging table is improved.

The invention relates to an atomization substrate storage part, an atomization device, an electronic cigarette and a control method. The atomization substrate storage component comprises a storage component body, the storage component body comprises a side wall and a bottom wall connected with the side wall, and the side wall and the bottom wall form a storage cavity used for storing atomization substrates; the heating element is arranged in the storage cavity and is used for heating the atomized matrix; the first electrode and the second electrode are arranged on the bottom wall, and the first electrode and the second electrode are electrically connected with the two pins of the heating element respectively. According to the embodiment of the invention, wiring can be simplified, and the atomization substrate storage part can be conveniently detached or sold independently.

The utility model discloses a novel lithium battery cap connecting piece structure, and relates to the technical field of lithium battery assemblies. The device comprises an inner fixing disc, an outer limiting ring, an abutting disc and an outer fixing disc, an insulating ring is fixed to the peripheral side of the inner fixing disc, a flexible ring is fixed to the peripheral side of the insulating ring, the outer fixing disc is fixed to the peripheral side of the flexible ring, an outer limiting ring is fixed to the peripheral side of the outer fixing disc, and the abutting disc is arranged above the top end of the inner fixing disc. The diameter of the abutting disc is smaller than that of the inner fixing disc, and a rubber ring is fixed to the top end of the outer fixing disc. Through the arrangement of the inner fixing disc, the outer limiting ring, the abutting disc and the outer fixing disc, the problems that a lithium battery cap connecting piece and a battery internal power connection structure are likely to cause broken contact due to stress after working for a long time, and short circuit is likely to be caused by contact of a positive electrode and a negative electrode in the battery are solved.

The present invention discloses a fixing bracket for an isolating switch, comprising a mounting plate, a first fixing bracket, and a second fixing bracket; one end of the first fixing bracket is connected to a side surface of the mounting plate at an acute angle; the other end of the second fixing bracket is fixedly connected to a support; one end of the second fixing bracket is connected to a side surface of the mounting plate at an acute angle; the other end of the first fixing bracket is fixedly connected to a support. In the present invention, since the other ends of the first and second fixing brackets are respectively connected to a side surface of the mounting plate at an acute angle, the isolating switch is also installed at a certain angle to the vertical direction after being fixed on the mounting plate. This solves the problem that the existing isolating switch installation method is horizontal installation or vertical installation, which makes it inconvenient to operate the isolating switch during routine operations such as disconnecting and closing.

The utility model discloses a torsion-resistant reinforced aluminum stranded wire electric welding machine cable which comprises a PTFE resin core tube body, and a plurality of aluminum wires are concentrically stranded around the outside of the PTFE resin core tube body to form an aluminum stranded wire conductor. A PTFE semi-directional tape wrapping layer, a foaming PFA extruded inner insulating layer, a PFA wrapped outer insulating layer, a butyronitrile polyvinyl chloride inner cushion layer, an AFRP reinforced woven anti-torsion plain woven net and a butyronitrile polyvinyl chloride sheath layer are sequentially wrapped outside the aluminum stranded wire conductor, and the winding direction of the PTFE semi-directional tape wrapping layer is opposite to the stranding direction of the aluminum stranded wire conductor. According to the cable, a steel core is replaced by the elastic resin core tube, steel core corrosion is avoided, the cable better adapts to various corrosion working conditions and environments, the structure of the aluminum stranded conductor is optimized, the mechanical strength and flexibility of the conductor are improved, the torsion resistance is enhanced, wire breakage is prevented, and the durability is better.

The utility model discloses a new energy high-voltage connector shielding ring crimping device, which belongs to the technical field of new energy high-voltage connector shielding ring crimping, and comprises a table, the top of the table is fixedly provided with a first electric push rod, two groups of rails and two groups of support rods, and the top of the table is provided with a crimping assembly. A box body is fixedly installed at the output end of the first electric push rod, two sets of supporting plates are fixedly installed on the front side of the box body, telescopic rods and springs are fixedly installed on one sides of the two sets of supporting plates, inclined plates are fixedly installed at one ends of the two sets of telescopic rods, and the other ends of the two sets of springs are fixedly installed on one sides of the corresponding inclined plates correspondingly; the two sets of inclined plates are slidably installed on the front side of the box body, one side of each inclined plate is fixedly provided with a clamp, the interior of the box body is provided with a wire harness, the outer side of one end of the wire harness is provided with a shielding ring, and the connector can be effectively prevented from being affected by loosening or vibration in the equipment operation process.

The utility model provides a circuit board assembly and electronic equipment. The circuit board assembly comprises a circuit board, an adapter plate, a fixing piece, an elastic piece and a functional device. A through hole is formed in the circuit board and penetrates through the circuit board in the thickness direction of the circuit board. The adapter plate and the circuit board are stacked, and the orthographic projection of the adapter plate to the circuit board covers at least part of the through holes. The fixing piece is fixedly connected with the adapter plate and the circuit board. The elastic piece is located between the circuit board and the adapter plate, is spaced from the fixing piece, and is electrically connected between the circuit board and the adapter plate. The functional device penetrates through the through hole and is installed on the surface, facing the through hole, of the adapter plate. According to the circuit board assembly provided by the embodiment of the invention, the reliability of the electric connection between the electronic element and the circuit board can be improved, so that the structural stability and the electric connection stability of the thinned circuit board are not influenced.

The invention discloses a control system and a control method for pressure regulation of a wire clamping electromagnet. The control system comprises a pressure detection module, a main control module and an electromagnet current driving module. The pressure detection module detects the pressure of the wire clamping electromagnet and outputs a pressure detection signal. The main control module receives the pressure detection signal and carries out filtering processing on the pressure detection signal. The main control module receives a target pressure value setting instruction, carries out progressive increase or progressive decrease gradual change processing on a previous pressure set value at a fixed slope according to the target pressure value setting instruction to serve as a current pressure set value, enables the current pressure set value to gradually reach a target pressure value, and outputs a control signal according to the current pressure set value and a pressure detection signal. And the electromagnet current driving module outputs electromagnet current according to the control signal so as to control the pressure of the wire clamping electromagnet. According to the technical scheme, smooth adjustment of the thread clamping pressure of the thread clamping electromagnet is achieved, the stability of the thread clamping pressure is improved, and the rate of thread breaking, thread jumping or thread floating is reduced.

This invention discloses a preheating stirring device for hydrogen sulfide production, relating to the field of hydrogen sulfide production technology. It includes a jacket located outside the reactor, through which a heat exchange medium is filled to heat or cool the reactor; a material-turning component for lifting the raw material from the bottom of the reactor and spreading it along the inner wall; and a material-stabilizing rack located on the inner wall of the reactor for supporting the solidified raw material. By incorporating the material-turning component, this invention can pump liquid sulfur from the bottom of the reactor upwards and back down along the inner wall, increasing the contact area between the liquid sulfur and hydrogen during the preparation process and thus improving the reaction rate. After production is completed, the heat flow to the jacket is stopped, allowing the internal temperature of the reactor to gradually decrease. The liquid sulfur continues to be poured onto the inner wall of the reactor in the aforementioned manner, causing it to solidify and adhere to the inner wall, eliminating the need for subsequent continuous heating for preservation.

The invention discloses a network detection device, which belongs to the field of network detection and comprises a box shell, a clamping plate is fixed in the box shell, a support frame is fixed at the top of the clamping plate, a power supply module, an antenna module and a database module are sequentially mounted on the front surface of the support frame from top to bottom, and a detection module and a protection module are mounted on the clamping plate. Transmission modules are installed on the two sides of the detection module, a network wiring end is formed through the two transmission modules, a wiring hole is formed in the box shell, a terminal is inserted into the wiring hole, a network cable is electrically connected to the terminal, the end, away from the terminal, of the network cable is connected with an external network, and a box door is rotationally arranged on the box shell. And the sliding mechanism is arranged on the box shell. When the network cable is subjected to small pulling force, the sliding mechanism can effectively play a role, and the first spring connected to the transverse rod in a sleeving mode can provide a buffer space for the moving block through elastic deformation of the first spring.

The utility model discloses a feeding mechanism of an FDM 3D printer, and relates to the technical field of printers. The 3D printer comprises a rack, a printing head assembly is installed on the rack, an L-shaped installation frame is fixedly installed at the top of the rack, a rotating roller is rotationally arranged above the vertical end of the installation frame, a containing disc is arranged on the rotating roller in a sleeved mode, and a first fixing plate is fixedly arranged on the lower surface of the top of the rack; by arranging the clamping rollers and the limiting rings, the unwinding ends of the consumables are limited and kept on a stable straight line, the consumables are prevented from swinging excessively at will in the traction process, the situation that the consumables are in excessive contact with the edges of the consumable placing discs is reduced, and the possibility of line breakage is effectively reduced; and meanwhile, when the limiting ring made of rubber swings at the end, close to the printing head, of the consumable, hard contact can be reduced, the probability of breakage is further reduced, and the continuity and stability of 3D printing are guaranteed.