81results about How to "Assembly accuracy is low" patented technology

The invention relates to the field of batteries, in particular to a preparation process of a high-capacity battery. The problem that an existing large-capacity battery sharing pipeline assembly is difficult to assemble is solved. Comprising the following steps: processing a shell, assembling a semi-finished shell, prefabricating a single battery, loading the prefabricated single battery into the semi-finished shell, sealing, unpacking and connecting in parallel. According to the invention, the plurality of capacity-graded and sorted single batteries with the sealing assemblies are arranged in the semi-finished product shell with the electrolyte sharing cavity, the cylinder is sealed by the second cover plate, and the sealing assemblies are opened through the unpacking process, so that the electrolyte sharing cavity is communicated with the electrolyte areas of the inner cavities of the single batteries, and the capacity-graded and sorted single batteries are separated. And the electrolyte of each single battery is shared to guarantee the consistency of each single battery, so that the cycle life of the high-capacity battery is prolonged. And the electrolyte sharing cavity is formed on the first cover plate, so that insertion is not needed, the requirements on processing precision and assembling precision are low, the assembling process is simple, and the processing difficulty of the large-capacity battery with the sharing system is reduced.

The utility model discloses a limiting structure and a relay, the limiting structure comprises a first part and a second part, and the first part is provided with at least two protruding parts; the second part is provided with at least two assembly holes, and the at least two protruding parts are limited in the at least two assembly holes respectively; a plurality of protrusions are further arranged between the outer peripheral face of the corresponding protruding part and the hole wall face of the assembly hole and arranged in the circumferential direction of the assembly hole.

The invention provides a hybrid welding method. The hybrid welding method comprises the following steps that the surfaces of a first to-be-welded part and a second to-be-welded part are cleaned; the welding interface of the first to-be-welded part and the second to-be-welded part is coated with a brazing material, and the first to-be-welded part and the second to-be-welded part are clamped to form a to-be-welded assembly; the to-be-welded assembly is fed into a vacuum brazing furnace to be brazed, a brazing material is cooled and solidified to form a brazing layer after being heated and melted, the brazing layer is connected with the first to-be-welded part and the second to-be-welded part, and a brazed welding part is obtained; and the brazing welding part is taken out of the vacuum brazing furnace, laser is focused on a brazing layer of the brazing welding part, the laser conducts scanning welding according to a preset track, and a welding part is obtained. The method can reduce the requirement of the component on the surface machining precision of the to-be-welded part and the requirement on the assembly process precision, can simplify the process, reduces the production cost, and improves the production efficiency.

The invention discloses a laser-arc hybrid welding system and method for dissimilar materials, and belongs to the technical field of welding. The hybrid welding system comprises a material pretreatment module (1), a laser module (2), a double-arc module (3), a blowing module (4), a weld joint monitoring module (5) and a postweld treatment module (7). The welding method comprises the steps of conducting welding pretreatment on the dissimilar material to be machined, adjusting the laser output head and the electric arc welding gun on the material to be welded, setting welding parameters, conducting welding, blowing, cooling and the like. The laser-arc hybrid welding system and method for the dissimilar materials, provided by the invention, integrates pre-welding treatment, the welding process and post-welding treatment into a whole set of complete system, is easy to implement, high in automation degree and high in operability, and greatly improves the welding efficiency and the welding quality.

The invention relates to the technical field of electronic equipment, and discloses an anti-shake motor and electronic equipment. The anti-shake motor comprises a fixed structure, a movable structure and a spring system, the fixing structure comprises a shell and a magnet, the shell is provided with a containing cavity, and the magnet is connected to the shell; the movable structure comprises a movable seat and a coil, the movable seat is arranged in the containing cavity, the coil is connected to the movable seat, and the coil is arranged on one side, in the Z-axis direction, of the magnet and is opposite to the magnet; the spring system is arranged in the containing cavity, the spring system comprises a spring assembly, the spring assembly comprises an anti-shake spring, and the anti-shake spring is connected with the fixed structure and the movable structure; according to the anti-shake motor provided by the invention, the magnet is connected to the shell and the coil is connected to the coil, so that the movable structure can be prevented from moving due to magnetic interference, the anti-shake effect can be improved, and the production cost and the assembly cost can be reduced.

The invention relates to the field of batteries, in particular to a preparation process of a high-capacity battery. The problem that an existing large-capacity battery sharing pipeline assembly is difficult to assemble is solved. Comprising the following steps: processing a shell, prefabricating a single battery, loading the prefabricated single battery into a barrel, sealing, unpacking and connecting in parallel. A plurality of single batteries with a sealing assembly are arranged in a cylinder with an electrolyte sharing cavity, the cylinder is sealed by a cover plate, the sealing assembly is opened through an unpacking process, so that the electrolyte sharing cavity is communicated with an electrolyte region of an inner cavity of each single battery, and the electrolyte of each single battery is shared to guarantee the consistency of each single battery; and the cycle life of the high-capacity battery is prolonged to a certain extent. The electrolyte sharing cavity is a first channel located in the barrel, insertion is not needed, and the requirements for machining precision and assembly precision are low; and meanwhile, the assembly process is relatively simple, and the processing difficulty and the processing cost of the large-capacity battery with the sharing system are greatly reduced.

According to the liquid nitrogen freezing temperature control inter-pile water stop steel sheet pile system, U-shaped flanges are arranged on the two sides of each steel sheet pile, the bending directions of the U-shaped flanges of every two adjacent steel sheet piles are opposite, the U-shaped flanges of every two adjacent steel sheet piles are buckled to form a tubular cavity, and the multiple steel sheet piles are connected end to end to define a protective curtain; the liquid nitrogen distribution pipe extends to the bottom of the steel sheet pile in the axial direction of the tubular cavity, liquid nitrogen distribution holes are evenly distributed in the side wall of the liquid nitrogen distribution pipe, and a sealing structure corresponding to the lower portion of the underground water-rich layer is arranged in the liquid nitrogen distribution pipe. Benefited from the efficient freezing effect of the liquid nitrogen, a section of waterproof frozen soil structure is rapidly formed in a water-rich stratum section, a sealing structure is arranged, and the elevation of a liquid nitrogen freezing area can be adjusted according to different water-rich layers, so that the splicing seam of every two adjacent steel sheet piles is sealed through the liquid nitrogen according to different soil body conditions; and the requirement for assembly precision of the steel sheet pile is not high, and therefore wide popularization can be achieved.

The utility model discloses a compressed air foam fire fighting truck and a compressed air foam fire fighting system in the technical field of compressed air foam, and aims to solve the problems that a transfer system of a compressed air foam fire fighting system in the prior art is high in assembly precision requirement and occupies the space in the height direction of a vehicle. The air compressor is in transmission connection with the transfer case through a first coupler and can adapt to length and angle errors, the requirement for assembly precision is lowered, and transmission of the air compressor is more stable and reliable; the air compressor and the water pump take power from a vehicle engine to realize single-vehicle operation; through power distribution of the transmission shaft and the transfer case, the occupied size is reduced, the requirement that the air compressor and the water pump are arranged in the length direction of the vehicle is met, the occupied space in the height direction of the vehicle is reduced, the device can be suitable for a large-span fire fighting truck to be provided with a full-hard-pipe and large-drift-diameter boom fire fighting pipeline, and then the on-way resistance of compressed air foam conveying is reduced.

The utility model discloses a relay which comprises a yoke plate and a coil rack. The yoke iron plate comprises a plate body and a positioning protrusion, and the positioning protrusion is arranged on the surface of one side of the plate body in the thickness direction in a protruding mode. The coil frame is arranged on one side, convexly provided with the positioning bulge, of the plate body; the coil rack is provided with a positioning hole, and the positioning projection is limited in the positioning hole, thereby guaranteeing the assembly precision between the yoke plate and the coil rack. Besides, the positioning protrusions are arranged on the yoke plate, so that the strength of the positioning protrusions is higher, when the relay is in a strong vibration environment, the positioning protrusions are not prone to breakage, the reliable positioning effect can still be kept under the cooperation of the positioning protrusions and the positioning holes, the assembly precision of the yoke plate and the coil frame is ensured, and the service life of the relay is prolonged. And the working reliability of the whole relay product is improved.

An electromagnetic valve connecting structure of a hydraulic shock absorber comprises a hydraulic cylinder and an electromagnetic valve, an electromagnetic valve mounting seat is welded to an outer oil hole formed in the cylinder wall of an outer cylinder of the hydraulic cylinder, the electromagnetic valve is arranged in the electromagnetic valve mounting seat, and an inner cylinder is arranged between the outer cylinder of the hydraulic cylinder and a working cylinder. An inner oil hole formed in the cylinder wall of the inner cylinder is opposite to the outer oil hole, a fixing seat is welded to the position of the inner oil hole, a valve seat of the electromagnetic valve is located in the electromagnetic valve installation seat, a T-shaped oil passing seat with an axial through hole is arranged between the valve seat and the fixing seat, and the small end of the T-shaped oil passing seat is inserted into an inner hole of the fixing seat. The T-shaped oil passing seat is in sealing connection with an inner hole of the fixing seat through an arranged circumferential sealing ring, the large end of the T-shaped oil passing seat makes contact with the oil inlet end of the valve seat through an arranged shaft end sealing ring to form sealing, an inner oil hole is communicated with the valve seat, and a supporting block used for limiting is arranged between a shaft shoulder of the large end of the T-shaped oil passing seat and the electromagnetic valve installation seat.

The utility model relates to the field of moka kettles, and discloses an integrated moka kettle which comprises a kettle body and a water outlet assembly, the kettle body is integrally formed, and a matching ring which divides the interior of the kettle body into an upper cavity and a lower cavity horizontally extends inwards from the inner ring wall of the kettle body. The water outlet assembly comprises a funnel and a liquid outlet pipe, the funnel is in lap joint with the matching ring, the bottom of the funnel extends into the lower cavity, the liquid outlet pipe is detachably sealed above the funnel, a kettle cover is detachably fixed to the upper end of the kettle body, and a downward pressing adjusting assembly capable of pressing the funnel on the matching ring is arranged on the kettle cover in a lifting mode. The downward pressing adjusting assembly comprises an internal thread through groove formed in the kettle cover in a downward concave mode and a thread jacking piece matched with the internal thread through groove, and the lower end of the thread jacking piece is provided with an elastic abutting piece which can elastically abut against the upper end of the liquid outlet pipe along with downward jacking of the thread jacking piece in the internal thread through groove. And the kettle cover is more labor-saving and convenient to cover.

This invention relates to the field of construction monitoring equipment technology, specifically a settlement observation instrument for roadbed safety construction. The instrument includes a string strain gauge and a differential pressure static level. The differential pressure static level has connecting pipes on both its air and water inlets, which are fixed to a conduit support. The signal line of the string strain gauge is fixed within the conduit support. The two ends of the string strain gauge are fixed to a fixed end and a floating end, respectively. The floating end includes a movable end seat fixedly fitted onto one end of the string strain gauge. This invention allows adjustment of the floating end's height position through a sliding fit between the upper ball joint and the rotating sleeve. The orientation and tilt angle of the floating end can be freely adjusted through the universal joint between the upper ball joint and the upper spherical shell, and between the lower ball joint and the lower spherical shell. During on-site installation, adjusting the floating end position ensures that the string strain gauge's measuring rod remains in a natural, unloaded, and unstressed state, thus avoiding measurement errors introduced by initial stress and effectively improving the accuracy and stability of roadbed settlement and tilt monitoring.

The utility model relates to a gear box fixing device of an intelligent toilet lid, the intelligent toilet lid and an intelligent toilet. The gear box fixing device of the intelligent toilet lid comprises a shell, a gear box and a fixing support. The shell is provided with a positioning groove and a through hole formed in the bottom of the positioning groove; the gearbox comprises a box body arranged on the shell, a gear assembly and a driving shaft, the gear assembly is arranged in the box body, and a positioning protrusion matched with the positioning groove is arranged on the side, facing the positioning groove, of the box body; the box body is inserted into the positioning groove through the positioning protrusion so as to be in positioning connection with the shell, the driving shaft penetrates through the positioning protrusion, one end of the driving shaft is located in the box body and is in transmission connection with the gear assembly, and the other end of the driving shaft penetrates through the through hole so as to be used for being in transmission connection with the turning cover or the seat ring. The fixing support covers the side, back on to the shell, of the gearbox, and the fixing support is detachably connected with the shell so that the gearbox and the shell can be fixed.

The invention relates to a radiation meter dense feed source array directional diagram optimization method based on a generative adversarial network. The method comprises the following steps: constructing a training data set, a condition vector containing a target directional diagram performance index and a corresponding optimal amplitude-phase weight vector; designing a conditional generative adversarial network model; constructing a physical constraint loss function by embedding a differentiable electromagnetic calculation module; loading the constructed training data set, and training a complete generative adversarial network model based on a loss function embedded with a differentiable electromagnetic calculation module; and when the system antenna pattern obtained according to the amplitude-phase adjustment parameters output by the generative adversarial network model meets the antenna pattern evaluation index, completing dense feed source array antenna pattern optimization. According to the method, the target weight is dynamically adjusted and optimized on orbit, so that a single model can adapt to beam forming requirements in different observation scenes, and flexible switching of multiple task modes such as high-resolution detection and wide-range general survey is realized.

The invention relates to the technical field of one-way valve structures, in particular to a check valve for an engine oil control valve. The check valve comprises a first shell, a valve body, a valve seat and a second shell. The first shell is provided with a first channel, a limiting protrusion is arranged on the first shell, and a buckle female end is further arranged on the first shell. The valve body is configured to be of a sheet-shaped structure, a plurality of elastic arms which are evenly distributed in the circumferential direction are arranged on the valve body in a derived mode in the radial direction, first positioning parts are arranged on the elastic arms, and the middle of the valve body protrudes outwards so that a blocking protrusion and a limiting groove can be formed on the two sides of the valve body respectively. The valve seat is provided with a second channel; the second shell is provided with a third channel and a connecting part, and the second shell is provided with a second positioning part and a buckle male end; when the elastic arm is in a natural state, the blocking protrusion blocks the second channel. The check valve is relatively simple in structure and easy to assemble, the valve body is not prone to abrasion and deformation in the using process, and the risk of reverse leakage of the check valve can be reduced.

The invention relates to the technical field of intelligent control, in particular to a multifunctional intelligent sensing device which comprises a base, a spherical dome, a mounting seat, an external monitoring unit, an internal monitoring unit, an open source development board and a battery, RGB Led lamps are mounted in the spherical dome, and the spherical dome is made of white or colorless transparent materials; the output end of the external monitoring unit is connected with the input end of the open source development board, the output end of the open source development board is connected with the control end of the RGB Led lamp, and the RGB Led lamp outputs signals by displaying different colors. An open source development board is adopted, the technology maturity and the product quality of the open source development board are strongly guaranteed, it is ensured that the device can stably operate, other elements such as a temperature / humidity sensor and a GRB LED sensor are mature products in the market and are suitable for mass production, and the quality can be guaranteed. In addition, the open source development board has more open source libraries, so that the time for a developer to write specific program codes is saved, and the development efficiency of products is improved.

A fixing clamp (2) for discharge outlet of intermediate bulk containers is disclosed. The discharge outlet (1) comprises a flange edge (3), a discharge connecting port (5) and a discharge outlet clamping part (4). The discharge outlet clamping part (4) is a polygonal structure. The fixing clamp (2) comprises a fixing clamp body, a clamping portion (8), elastic guiding ribs (7) and anti-release portion (9). A passage for accommodating the discharge outlet clamping part (4) is formed in the middle part of the fixing clamp body. The clamping portion (8) is used for clamping the side surface of the discharge outlet clamping part (4) when the fixing clamp (2) and the discharge outlet (1) have been assembled. The elastic guiding ribs (7) will be squeezed by the side surface of the discharge outlet clamping part (4) to deform When the leading-in surfaces of the elastic guiding ribs (7) contact with the side surface of the discharge outlet clamping part (4). The elastic guiding ribs (7) restore elastically and the anti-release portion (9) are engaged with the side surface of the discharge outlet clamping part (4) to prevent the fixing clamp (2) from being separated from the discharge outlet (1) after the fixing clamp (2) and the discharge outlet (1) have been assembled. The fixing clamp (2) can be transversely pushed in to be assembled with the discharge outlet (1). The fixing clamp has low requirements for assembly accuracy, and is favorable for saving cost and increasing efficiency.

This application relates to a vehicle body structure and a vehicle, wherein the vehicle body structure includes a sill beam and a battery pack. The battery pack is connected to the sill beam; the battery pack includes a battery pack crossbeam, which is fixedly connected to the sill beam. On a projection plane perpendicular to the height direction of the vehicle, the projections of the sill beam and the battery pack crossbeam partially overlap. By making the projections of the sill beam and the battery pack crossbeam partially overlap, a direct connection between the sill beam and the battery pack crossbeam can be easily achieved, enabling the transmission of forces between the battery pack and the sill beam. This eliminates the need for or minimizes the need for reinforcing members between the battery pack and the sill beam. Furthermore, to achieve the connection between the sill beam and the battery pack crossbeam, no additional connecting brackets or other structures for transition are required between them. The number of parts at the connection point between the sill beam and the battery pack is reduced, and the assembly precision requirements for the sill beam and the battery pack crossbeam are lower.

The application discloses a semiconductor wafer bin conveying system and a control method thereof, and relates to the technical field of semiconductor manufacturing automation. The system comprises a conveying unit and a material placing unit. The improvement lies in that the bottom of a wafer bin body is provided with three positioning grooves in isosceles triangle distribution, forming a mistaken orientation prevention structure; and the transfer frame and the material placing frame are respectively provided with a first set and a second set of limiting protrusions corresponding to the positioning grooves. The two sets of protrusions are configured to be selectively and sequentially clamped with the positioning grooves at the bottom of the same bin body during the conveying process, so that the anti-interference positioning handover from grabbing to placing is realized. The application eliminates the positioning collision risk between the conveying mechanism and the fixed station from the mechanical structure, and ensures the uniqueness of the direction of the wafer bin through the asymmetric geometric design. Meanwhile, the material placing frame can be integrated with elastic air supply and pressure sensing detection functions, realizing higher automation and reliability.

This utility model discloses a push-pull magnetic control handle for a teacup, including a handle body, which includes a handle body and a base disposed on the front side of the handle body. The base has a movable cavity, within which a strong magnet is movably disposed vertically. The strong magnet controls the valve of the magnetized body in the teacup. An actuating element is movably disposed within the movable cavity, and the strong magnet is mounted on the actuating element so that the actuating element drives the strong magnet to move vertically closer to or away from the magnetized body. Driving parts are provided on both sides of the actuating element, extending outside the base. When an external force pushes the driving parts upwards or downwards, the actuating element drives the strong magnet to move vertically, bringing it closer to or away from the magnetized body inside the teacup, thereby opening or closing the valve inside the teacup. This structure is not only convenient for manual operation but also simple in design, requires low assembly precision, and helps reduce production costs.

A scroll compressor includes a motor, a compression mechanism, a drive shaft and a bushing. The compression mechanism includes a fixed scroll and an orbiting scroll. The drive shaft has an eccentric journal. The bushing is designed to be movable relative to the eccentric journal to enable the orbiting scroll to have a variable eccentricity, wherein one axial section of the bushing is arranged between the orbiting scroll and the eccentric journal to enable the drive shaft to transmit power to the orbiting scroll via the one axial section of the bushing, and another axial section of the bushing is designed to limit the range of movement of the bushing relative to the eccentric journal to further define the range of variation of the variable eccentricity of the orbiting scroll. The bushing with the above configuration cooperates with the corresponding structure to reliably and effectively limit the range of movement thereof to enable the orbiting scroll to have a proper variable eccentricity, which reduces the requirement for assembly accuracy of the scroll compressor and thereby reduces the cost of the compressor.

The utility model discloses a high-capacity battery and an end plate assembly. The high-capacity battery comprises a shell and m single batteries arranged in the shell, the shell is provided with an electrolyte sharing chamber, a gas chamber and a functional interface; the functional interface comprises a cylindrical body, an explosion venting mechanism, a first plugging piece and a second plugging piece; a liquid channel, a gas channel and an explosion venting channel are formed in the cylindrical body; one end port of the liquid channel is communicated with the electrolyte sharing chamber, and the other end port is provided with a first plugging piece; one end port of the gas channel is communicated with the gas chamber, and the other end port is provided with a second plugging piece; one end opening of the explosion venting channel is communicated with the gas cavity, and the other end opening is provided with an explosion venting mechanism. The electrolyte sharing cavity does not need to be plugged, so that the processing difficulty and the processing cost of the high-capacity battery with the sharing system are greatly reduced.

This invention relates to the field of track conveying technology and discloses a track conveying module and sorting equipment, comprising: a track body extending along a first direction; a drive assembly including a drive mechanism, an open synchronous belt, and two bearing shafts with toothed grooves on their outer circumferences, the two bearing shafts being respectively disposed at both ends of the track body along the first direction, one of the bearing shafts being connected to the drive end of the drive mechanism for driven rotation, the two ends of the open synchronous belt respectively bypassing the two bearing shafts and engaging with the toothed grooves; and a sliding assembly slidably connected to the track body for carrying the items to be conveyed, the two ends of the open synchronous belt bypassing the two bearing shafts being fixedly connected to the sliding assembly. This track conveying module and sorting equipment can meet the requirements of long-stroke conveying while avoiding sudden jamming or failure of transmission components, effectively improving service life and operational reliability under conditions of relatively high dust levels and relatively long strokes.

The present invention discloses a high-power electric drive gearbox passive heat dissipation test bench and test method. A high-power fan and an air rectifier and temperature-regulating pipe are used to realize that the airflow on the surface of the gearbox to be tested is parallel and the temperature is controllable. The lifting mechanism enables the test bench to adapt to the test requirements of gearboxes to be tested with different center distances, thereby improving the versatility of the test bench. At the same time, due to the transmission characteristics of the lead screw, the lifting mechanism makes the position of the gearbox self-locking, thereby improving the safety during use. The four guide rails of the lifting mechanism also play a role in improving the transmission accuracy. The application of the universal coupling reduces the requirements for assembly accuracy during the bench test process. The simultaneous use of the drive motor and the load motor enables the test bench to simulate all working conditions when the whole machine is used. The transmission device of the drive motor is located on the back of the gearbox to be tested, and does not interfere with the gas flow on the front of the gearbox, thereby improving the consistency of the gas flow during different working condition tests.

The utility model provides a water tank mounting structure and ironing equipment, the water tank mounting structure is applied to the ironing equipment, the water tank mounting structure comprises an ironing equipment main body, and the ironing equipment main body is provided with a plurality of first clamping structures; the water tank is provided with a plurality of second clamping structures, the second clamping structures and the first clamping structures are clamped in a one-to-one correspondence mode, one of the first clamping structures and the second clamping structures is a clamping column, the other one of the first clamping structures and the second clamping structures is a clamping groove, the clamping column comprises a ball head arranged at the free end of the clamping column, and the ball head is configured to be clamped with the clamping groove. Through cooperation of the ball head and the clamping groove, the requirement for the assembly precision of the ironing equipment body and the water tank can be lowered, and meanwhile disassembly / assembly convenience is improved.

The present invention discloses a rotary compact sound level meter automatic calibration device and method, the device comprising: a sound level meter with a flexibly adjustable position; a sound pressure calibrator with a fixed position; an automatic position adjustment device for the sound level meter, used to support the sound level meter and automatically adjust the position of the sound level meter during calibration; a main control unit, used to coordinate and control the operation of the automatic position adjustment device of the sound level meter, realize the position adjustment of the sound level meter, and perform data collection and analysis of the sound level meter and the sound pressure calibrator, and then calibrate the sound level meter. The present invention only designs one set of position adjustment equipment, and through the improvement of the system structure, it greatly reduces the space occupied by the system, reduces the cost, reduces the requirements for the processing and assembly accuracy of the control system, and improves the overall stability of the system.

The invention relates to the technical field of irradiation test loop equipment, and provides an ion exchange column suitable for an irradiation test loop, the ion exchange column comprises an outer cylinder and an inner cylinder used for placing the ion exchange column, the lower end of the outer cylinder is provided with a water outlet pipe communicated with the inner cylinder, the upper end of the outer cylinder is connected with an end flange, and the inner spherical surface of the end flange is cooperatively connected with a sealing plug. The sealing plug is provided with a water inlet pipe communicated with the inner cylinder, the end flange is in bolted connection with a gland flange used for pressing the sealing plug and fixing the sealing plug in the end flange, the outer cylinder and the inner cylinder are arranged in a sleeve structure, and the gland flange and the end flange are connected through bolts so as to abut against the sealing plug and the end flange, so that spherical surface sealing fit is achieved; the requirement for assembly precision is lowered, the flexibility and quickness of assembly are improved, and therefore the exposure dose of operators is reduced.

This invention relates to an electronic expansion valve, comprising a drive assembly, a screw, a valve needle, a valve seat, a bearing, and a valve needle spring. The valve seat has a fluid passage. The drive assembly drives the screw to rotate and move axially. The valve needle has an axial mounting hole inside, and its upper part has a bearing cavity to accommodate the bearing. The lower end of the screw extends into the axial mounting hole and is rotatably connected to the bearing, allowing for axial sliding. A screw retaining ring is provided at its lower end, and a screw annular protrusion is provided on its outer periphery. The valve needle spring is sleeved on the screw and confined between the screw annular protrusion and the upper end face of the valve needle. Downward movement of the screw compresses the valve needle spring through the screw annular protrusion, pushing the valve needle downward. Upward movement of the screw pushes the valve needle upward through the screw retaining ring against the bearing, thereby achieving stable axial movement of the valve needle to precisely control the opening and closing of the fluid passage. This structure achieves pure axial transmission through the bearing, effectively preventing the valve needle from rotating and vibrating with the screw. The compact layout of the valve needle spring significantly shortens the axial dimension of the valve body, improving transmission reliability and service life.

This utility model relates to the field of sensor technology, providing a pressure sensor structure and an electronic pressure pen. The pressure sensor structure includes an elastic body and a flexible circuit board. The elastic body includes an elastic main body and a contact structure for contacting a pressure-applying structure of an external device. The flexible circuit board is located on the side of the elastic main body away from the contact structure and is electrically connected to the main control circuit board of the external device. The pressure sensor structure provided by this application has a simple overall structure. Furthermore, by adding the contact structure, the assembly precision between the elastic main body and the external pressure-applying structure is reduced. The force applied by the pressure-applying structure can be transmitted to the elastic main body more quickly, and the deformation of the elastic main body under force is more pronounced, which also improves the pressure sensitivity accuracy of the pressure sensor structure to a certain extent.

The present invention provides a planetary roller force transmission mechanism and electric brake device with easy friction rolling and clearance compensation, which solves the problems that the existing electronic mechanical brake system screw and nut are easy to fail to achieve rolling friction, the processing accuracy requirement is high, the screw is easy to slip, and the working noise increases. The mechanism includes a hollow input shaft, a planetary carrier, an output shaft, an expansion ring and N planetary roller assemblies, each planetary roller assembly includes a planetary shaft and a planetary roller; the planetary carrier is arranged in the hollow input shaft; the N planetary shafts are arranged on the planetary carrier along the circumferential direction, and there is a radial gap between the planetary shaft and the planetary carrier; the hollow input shaft is provided with an internal thread or an internal annular convex groove, and the planetary roller is provided with a matching external thread or an external annular convex groove; two expansion rings are respectively located on the outer side of the two end surfaces of the planetary carrier, each expansion ring is formed by N inwardly opening outer rings and N outwardly opening inner rings staggered and connected end to end, and the ends of the N planetary shafts are respectively clamped in the N inner rings of the expansion ring; the output shaft is arranged at the front of the planetary carrier.