29results about How to "Improve contact strength" patented technology

The invention discloses a double-sealed novel water pump which comprises a pump body and a pump shell, the pump shell is matched with the pump body, a motor is installed at the bottom end of the pump body, an impeller is installed at the top end of the pump body, the output end of the motor is fixedly connected with the impeller, an internal sealing ring is installed on the pump body, and a plurality of annular reserved cavities which are annularly arranged at equal intervals are formed in the pump body. According to the scheme, the cross section of the internal sealing ring is arranged to be in the L shape, the contact area between the internal sealing ring and the pump body and the contact area between the internal sealing ring and the pump shell are increased, and the service life of the internal sealing ring is prolonged; a gap generated between the inner sealing ring and the pump shell can be filled in time in a vibration environment through the arrangement of the annular expansion bag, second-layer sealing is achieved through the arrangement of the outer sealing assembly, the stability of the mounting hole is enhanced, leaked liquid is absorbed through the water absorption ring, and the threaded connection position between the extrusion ring and the pump shell is blocked.

The invention relates to a planetary roller screw with contact of concave and convex contact points, and relates to the technical field of planetary roller screws. A roller working tooth profile of the planetary roller lead screw adopts a convex arc tooth profile, a lead screw working tooth profile of the planetary roller lead screw adopts a concave arc tooth profile, and a nut working tooth profile of the planetary roller lead screw adopts a concave arc tooth profile; in the movement process of the planetary roller screw, the roller convex tooth profile surface is in contact with the screw concave tooth profile surface and the nut concave tooth profile surface, the convex tooth profile surface is a working tooth profile surface formed by a convex arc tooth profile curve section, and the concave tooth profile surface is a working tooth profile surface formed by a concave arc tooth profile curve section. The lubricating device has the characteristics of high contact strength, large bearing capacity, high transmission efficiency and good lubricating effect.

The invention belongs to the field of preparation of negative electrode materials, and particularly relates to a lithium ion battery silicon negative electrode with an optimized alloying array transition layer and a preparation method of the lithium ion battery silicon negative electrode. A potassium hydroxide solution is used as an electrolyte, a copper foil is placed on a constant voltage source to be subjected to anodic oxidation, a Cu (OH) 2 nanowire array with the surface evenly growing is obtained, annealing treatment of argon and hydrogen mixed gas is conducted before a silicon active substance is coated through magnetron sputtering, and the Cu nanowire is obtained through reduction. After the Si active material layer is coated by magnetron sputtering, the whole electrode is subjected to annealing treatment, so that a Cu3Si alloy is generated at the interface of Cu and Si, and the contact strength and the conductive efficiency of the Cu and the Si are enhanced. According to the invention, the problem that the silicon negative electrode is not firmly adhered to the current collector and is easy to fall off from the current collector to cause power loss in the battery circulation process under the condition of violent volume change is solved. The reaction specific surface area is increased through the three-dimensional nanowire array structure, and the performance of the silicon negative electrode under the large current density is enhanced through the transition layer of the copper-silicon alloy.

The utility model discloses a vacuum dryer for preparing injection cephalosporin products, which belongs to the technical field of medicine preparation equipment and comprises a shell, a shifting component and an electric heating plate for providing heat, the shifting component comprises a mounting plate and a linear motor I, the side surfaces of the mounting plate and the electric heating plate are fixedly connected with the shell in an embedded manner, and the linear motor I is fixedly connected with the shell. A plurality of telescopic inner rods are welded to the bottom face of the moving plate, sealing rings are connected to the side faces of the telescopic inner rods in a sleeving mode, telescopic outer rods are fixedly connected to the side faces of the sealing rings in an embedded mode, and movable blocks are slidably connected to the top faces of the telescopic outer rods through formed inner cavities. The top surface of the movable block is welded with the telescopic inner rod, the bottom surface of the movable block is fixedly connected with a pressurizing spring, the bottom end of the pressurizing spring is fixedly connected with the telescopic outer rod, and the drying effect of injection cephalosporin product preparation raw materials is improved by providing rolling and stirring effects on the injection cephalosporin product preparation raw materials.

The utility model relates to a waterproof wire passing sleeve, which belongs to the technical field of wire harness accessories and comprises a flexible sleeve, a limit groove is arranged outside the flexible sleeve and used for being embedded in a through hole of a shell, sealing rings are arranged on opposite surfaces of the limit groove, and a plurality of groups of waterproof flexible films are arranged on the inner wall of the flexible sleeve. The waterproof flexible film is provided with a gap through which a wire harness passes. The sealing rings are arranged on the opposite faces of the limiting grooves, the sealing rings make contact with the shell to deform, the contact strength of the flexible sleeve and the shell is improved, and then the sealing performance is improved. According to the waterproof structure, the multiple sets of waterproof flexible films are arranged, when the wire harness passes through the gaps in the waterproof flexible films and then makes contact with the waterproof flexible films, the waterproof flexible films deform, meanwhile, the multiple waterproof flexible films are arranged in a staggered mode to form non-complete sealing type water prevention, and external rainwater can be effectively blocked.

The building construction foundation pit guardrail comprises a guardrail body, a plurality of fixing frames are arranged on the back face of the guardrail body, a plurality of prompt marks are arranged on the front face of the guardrail body, a plurality of connecting sleeves are arranged on the two sides of the guardrail body in a staggered mode, and the interiors of the connecting sleeves are connected in an inserted mode through connecting rods. An extension plate is arranged at the bottom of the back face of the guardrail body, clamping grooves of L-shaped structures are symmetrically formed in the two sides of the extension plate, the fixing frame is composed of a bottom plate and a support, the support is located on one side above the bottom plate, one end of the bottom plate is connected with the clamping grooves in an inserted mode, and the other end of the support is connected with the back face of the guardrail body in an inserted mode. A plurality of non-return plates are arranged at the bottom of the bottom plate, and a plurality of anchor rods are arranged among the non-return plates.

The invention relates to the technical field of oil and gas drilling, in particular to a mechanical dynamic seal structure, a motor dynamic seal mounting structure and a seal testing device.The mechanical dynamic seal structure comprises a mechanical dynamic seal static ring and a mechanical dynamic seal dynamic ring which are coaxially arranged, and a mechanical dynamic seal static ring support is arranged on the inner side of the mechanical dynamic seal static ring; a mechanical dynamic sealing movable ring bracket is arranged on the inner side of the mechanical dynamic sealing movable ring; a first annular groove is formed in one end of the mechanical dynamic sealing static ring support, and a static ring alloy ring is arranged in the first annular groove. A second annular groove is formed in one end of the mechanical dynamic sealing movable ring support, and a movable ring alloy ring is arranged in the second annular groove. The static ring alloy ring and the moving ring alloy ring are hermetically and rotatably abutted against each other; an expansion ring is fixedly arranged on the inner side of the other end of the mechanical dynamic sealing movable ring, and a sealing top cover is fixedly arranged at the other end of the mechanical dynamic sealing movable ring in a sealing mode. The static ring alloy ring and the movable ring alloy ring rotate mutually, movable sealing is achieved through the oil film, the sealing effect is improved, and the sealing ring can be suitable for sealing in the high-temperature and high-pressure severe working environment.

The present invention relates to a flexible large-diameter gear transmission device, comprising a small gear and a large-diameter gear meshing with the small gear and a flexible force-applying mechanism. The small gear is installed in a gear seat. The force-applying mechanism consists of a force-applying component, a force-applying end and a force-applying terminal. The force-applying terminal contacts the outer shell pressure surface of the gear seat, and one force-applying end is connected with its force-applying point. The force-applying direction of the force-applying terminal coincides with the common normal line of the contact points of the tooth profiles of the two gears, and is always directed toward the large-diameter gear. The gear seat is placed in a guide rail that enables it to move linearly, and the gear seat reciprocates along the common normal line of the contact points of the tooth profiles of the two gears. The force-applying component always gives the gear seat a suitable pre-tightening force, so that the force-applying terminal forms a close contact with the outer shell pressure surface of the gear seat, so that the small gear makes a radial "follow-up" movement with the large-diameter gear, so that the force applied to the gear seat can always maintain a good and stable contact spot between the small gear and the large-diameter gear, so as to improve the load-bearing capacity and service life.

This utility model discloses a toothed structure for the grab bucket blade of a bridge crane, relating to the field of grab bucket technology for bridge cranes. It includes a first bucket body and a second bucket body connected by a fixed pulley. The first bucket body has four teeth, and the second bucket body has five teeth. The second bucket body also has four spacer slots. When the first and second bucket bodies are closed, each tooth of the first bucket body is located in one spacer slot. The teeth of the first bucket body are trapezoidal in shape and are located at the end furthest from the first bucket body. The teeth of the second bucket body are isosceles trapezoidal in shape and are located at the end closest to the second bucket body. This utility model, through optimized tooth structure and the use of wear-resistant materials, effectively improves the wear resistance and grabbing efficiency of the grab bucket, extending its service life. It is particularly suitable for handling hard materials such as ores and coal, reducing wear and malfunctions during operation.

The utility model relates to photovoltaic laying technical field discloses a kind of photovoltaic panel laying mounting frames for steep slope, including mounting frame body and at least two support mechanisms, and mounting frame body is suitable for carrying photovoltaic electric board;Two support mechanisms are respectively arranged in the opposite two sides of mounting frame body, and all are connected with mounting frame body, and any support mechanism includes the support drill rod and fixed structure connected with each other, one end of support drill rod is connected with mounting frame body, and the other end is suitable for inserting ground;Fixed structure includes at least two fixed components, two fixed components are respectively arranged in the opposite two sides of support drill rod, and all are connected with support drill rod, and any fixed component includes the fixed inner tube and fixed outer tube and fixed unit of sliding connection, one end of fixed inner tube is rotatably connected with support drill rod, fixed unit is connected with the one end of fixed outer tube away from fixed inner tube, and fixed unit is suitable for contact with ground, to fixed support support drill rod;The utility model is favorable to improve the stability of mounting frame.

The invention belongs to the technical field of wear resistance testing, and particularly relates to a wear resistance testing device and method for a luggage pull rod. Comprising a test box; a notch is formed in the test box; a box body is placed in the test box; the box body is positioned in the notch; a pull rod is slidably arranged on the side of the box; a position control clamping unit is arranged on the test box; the position control clamping unit comprises a first base; the two first bases are both mounted at the bottom of the test box; the two ends of the position control lead screw are connected to the opposite faces of the two first bases correspondingly. Two thread areas are symmetrically arranged on the position control screw rod; the thread directions of the two thread areas are opposite; the double-action testing device is arranged on the testing box; the double-action testing device comprises a limiting chute which is arranged at the bottom of the testing box in a penetrating manner; the limiting chute extends to the inner bottom surface of the test box; the pull rod can be smoothly pulled by the device, the device is prevented from being clamped due to the self-locking function of the device in the testing process, the testing effect and efficiency of the device are improved, and the limitation of the device in practical application is reduced.

This invention relates to the field of hydraulic press technology and discloses a hydraulic press device for producing metal trash cans, including a main body with four positioning rods fixedly connected to the top of the main body. When the arc-shaped plate continues to press the top of the can and rotates, it provides guiding friction to the can body. At this time, the metal area at the top of the can body is bent and shaped as the arc-shaped plate rotates. When the can body pushes the arc-shaped plate upwards, the arc-shaped plate pre-presses the metal at the top of the can body. Then, when the arc-shaped plate drives the metal of the can body to rotate and curl the edge, it enhances the curling force while reducing the likelihood of cracks appearing in the metal body during the curling process. By assisting in increasing the curling strength of the metal body, the arc-shaped plate further improves the integrity of the curling angle and increases the curling efficiency.

The utility model belongs to battery technical field discloses a kind of for solid-state battery's battery core pole group and solid-state battery.The battery core pole group for the solid-state battery includes positive plate, solid-state electrolyte layer and negative plate, and positive plate, solid-state electrolyte layer and negative plate are sequentially arranged to set up.And, the battery core pole group for the solid-state battery further includes at least one pore structure, pore structure is penetrated in positive plate, solid-state electrolyte layer and negative plate, pore structure is at least partially filled with elastic solid-state electrolyte, to make elastic solid-state electrolyte with positive plate, solid-state electrolyte layer and negative plate connection, can enhance the interface contact area of solid-state battery, release the stress caused by volume expansion of electrode material, improve the cycle performance of solid-state battery, and provide ion transmission fast channel, further improve the rate charge-discharge performance.

The utility model belongs to the technical field of electronic product structures, and particularly relates to a detachable anti-collision waterproof angle bead structure. The notebook computer shell comprises a notebook computer shell body and installation frame plates arranged at the corners of the notebook computer shell body, anti-collision angle beads are attached to the surfaces of the installation frame plates, frame plate installation holes are formed in the surfaces of the installation frame plates, and installation center cylinders correspondingly matched with the frame plate installation holes in position are arranged on the surfaces of the anti-collision angle beads. The bottom of the frame plate mounting hole is provided with an open hole allowing the positioning screw to pass through; the frame plate positioning holes are formed in the upper end face of the mounting frame plate. According to the anti-collision corner protector, the multiple sets of positioning insertion columns of the anti-collision corner protector stretch into the frame plate positioning holes, the installation center cylinder correspondingly stretches into the frame plate installation holes, the anti-collision corner protector is closed at the corner of the notebook computer shell through threaded connection of the positioning screws and the installation center cylinder, and the anti-collision corner protector is made of elastic materials of the anti-collision corner protector. And a good anti-collision effect is provided for the corners of the whole notebook computer shell.

A bearing inner and outer diameter detection device disclosed by the present invention comprises a pedestal, the pedestal is hollow and is provided with an operation cavity, the pedestal is rotatably provided with a rotating disc, the end face of the rotating disc is a placing surface for placing an external bearing or a bearing part, and the placing surface is provided with a fixing member for fixing the external bearing or the bearing part. The base is provided with a clamping piece used for fixing an external detection instrument and an adjusting piece used for being in linkage fit with the clamping piece to adjust the position and the inclination angle of the output end of the external detection instrument, and a driving piece used for driving the rotating disc to rotate in the axial direction is arranged in the operation cavity. The problems that in the prior art, when the bearing ring is detected, the bearing ring needs to be manually and continuously rotated, and when the bearing ring is manually rotated, the bearing ring is prone to shifting are solved.

The invention relates to the technical field of transmission devices, in particular to a large-speed-ratio small-tooth-difference planetary reduction gear which comprises a fixed inner gear ring, an output inner gear ring and a transmission structure. The output inner gear ring is internally connected with the fixed inner gear ring through a connecting bearing; the transmission structure comprises an input shaft, a planet carrier, a first sun gear and a second sun gear; a tooth number difference is kept between the first sun gear and the second sun gear; the planet carrier comprises a planet sleeve, a planet plate and a planet shaft; a first planet wheel is mounted on the left planet shaft, a second planet wheel is mounted on the right planet shaft, and the radius of the first planet wheel is smaller than that of the second planet wheel; one side of the first planet gear is in meshing transmission with the first sun gear, and the other side is in meshing transmission with the fixed inner gear ring; one side of the second planet gear is in meshing transmission with the second sun gear, and the other side is in meshing transmission with the output inner gear ring. An eccentric shaft mechanism is omitted, manufacturing is easy, and dynamic balance is good; meanwhile, the noise is low, the transmission precision is high, and the small-space large-speed-ratio speed reduction requirement is met.

The utility model discloses a geotextile tube bag lap joint sewing structure which comprises a first bag body, a second bag body and a sewing thread, the first bag body is in lap joint with the second bag body, and a sewing thread layer is arranged between the first bag body and the second bag body. The utility model belongs to the technical field of geotextile tube bags, and particularly relates to a lap joint sewing structure of a geotextile tube bag. By comprehensively considering and designing the sewing thickness, the diameter of the sewing line and the contact length of the sewing position, the performance and the engineering quality of the geotextile tube bag can be ensured.

The utility model discloses a casing sliding plate brick with a positioning device on the back surface, which comprises a sliding plate brick body and a steel shell, the sliding plate brick body is mounted in the steel shell, fire clay is filled in a gap between the sliding plate brick body and the steel shell, a positioning bulge is convexly arranged on a fire clay combined plate surface, adjacent to the steel shell, of the sliding plate brick body, and the positioning device is arranged on the positioning bulge. The positioning protrusions are located between the sliding plate brick body and the fireclay combination inner surface of the steel shell, and the free ends, away from the sliding plate brick body, of the positioning protrusions make contact with the fireclay combination inner surface. According to the sliding plate brick, the bonding strength of the sliding plate brick and fireclay is increased through the positioning protrusions arranged on the back face of the sliding plate brick, meanwhile, the positioning protrusions play a role in positioning and supporting in the shell loading operation, the thickness of the fireclay is convenient to control, and the labor efficiency and the production stability of the shell loading operation are improved.

The invention relates to an arc-shaped convex tooth coupling and a using method, and belongs to the technical field of coupling transmission. According to the technical scheme, a left claw disc (1) and a right claw disc (2) are included, the left claw disc (1) and the right claw disc (2) are provided with a plurality of left claw disc protruding teeth (101) and a plurality of right claw disc protruding teeth (201) respectively, the number of the left claw disc protruding teeth (101) is the same as that of the right claw disc protruding teeth (201), the two sides of the left claw disc protruding teeth (101) and the two sides of the right claw disc protruding teeth (201) are each of an arc-shaped structure, and the left claw disc protruding teeth (101) are meshed with the right claw disc protruding teeth (201); and oil injection holes (202) are formed in the right claw disc convex teeth (201). The double-claw chuck has the beneficial effects that meshing transmission is conducted through the arc-shaped left claw disc convex teeth and the arc-shaped right claw disc convex teeth, the relative displacement of the two axes can be compensated, buffering and damping can be achieved, large loads can be borne, the oil injection hole is formed in the right claw disc, the arc-shaped convex teeth are protected, the service life is prolonged, and the working efficiency is greatly improved.

The utility model discloses a low-lint-falling wear-resistant fine-velvet-feeling sofa fabric which comprises a surface layer, the bottom of the surface layer is connected with a middle layer, and the bottom of the middle layer is connected with a bottom layer; according to the low-lint-falling wear-resistant fine-lint-feeling sofa fabric, the carbon nano tube coating is polished and covered with the polyvinyl alcohol coating, through the carbon nano tube coating, permeation of stains and liquid can be prevented, corrosion of stains and bacteria to lint and fibers is reduced, and cleanliness of the fabric is kept, so that protection on the lint is improved, the lint falling possibility is reduced in a disguised mode, and the low-lint-falling wear-resistant fine-lint-feeling sofa fabric is suitable for being popularized and applied. The firmness and tightness of the fabric can be improved through superposition of the glass fibers and the carbon fibers, external pressure and friction force borne by the fabric can be effectively dispersed during superposition, the overall structural property of the fabric is improved, the wear resistance of the fabric is effectively improved, the waterproof film covers and is attached to the bottommost part of the bottom layer, moisture can be blocked through the waterproof film, and the waterproof effect is good. A double-layer waterproof effect can be formed through the polyester fibers and the waterproof coating, so that the waterproof performance of the sofa fabric is improved.

The invention belongs to the technical field of fermentation, and particularly relates to a sealed cordyceps militaris fermentation device and method. Comprising an equipment table; a fermentation tank is arranged at the top of the equipment table, and a tank cover is further arranged at the top of the fermentation tank; the fermentation tank is also provided with a pressing densification structural member; the bottom of the tank cover is connected with a convex circular ring; the top of the fermentation tank is connected with a concave ring groove, and the concave ring groove is matched with the convex ring; the top of the can cover is further provided with a spin-coating glue sealing unit. An integrated rotation driving device is also arranged on the fermentation tank; the integrated rotation driving device comprises a driving motor, a clamping frame is installed on the driving motor, and a driving base is connected to the clamping frame. The sealing state of the fermentation tank is ensured by pressing the densification structural member, the phenomenon that the fermentation quality and yield of cordyceps militaris cannot be affected due to the fact that the tank cover and the fermentation tank are not connected in place is avoided, the fermentation effect of the device is improved, and the limitation of the device in use is further reduced.

The invention discloses a Z-type oil-free multi-stage compression straightening device, aiming to provide a Z-type oil-free multi-stage compression straightening device with good anti-jumping effect, simple structure and good lubrication effect. The key points of the technical scheme are as follows: the Z-type oil-free multi-stage compression straightening device is arranged to also include a piston part, a piston rod connected to the piston part and a power part connected to the piston rod in a transmission manner, the power part includes a driving device, a crankshaft connected to the driving device, a connecting rod respectively connected to the crankshaft and the piston rod, and a crosshead arranged outside the piston rod and fixed to a machine body, the crosshead is used to convert the rotation of the crankshaft into a linear transmission, thus forming good structural stability, and by arranging a straightening device on the machine body which is sleeved on the piston rod and is used to eliminate the crosshead bounce of the piston rod, the straightening device eliminates the influence of the crosshead bounce on the piston rod and thus completely eliminates the bounce of the piston, and the invention is applicable to the technical field of compressor accessories.

The utility model discloses a high -end inverter high -current end piece formula capacitor, including by the core, and the capacitor shell that cladding setting in the capacitor main part of core outside is constituted, the both ends of core are connected with the connecting terminal through the electrode sheet, and the connecting terminal is including the terminal main part, and is set up in the head of terminal main part, and with the plug connector of electrode sheet connection, the tail of plug connector is equipped with the card hole. The utility model solves the problem of insufficient of capacitor in prior art to the high current resistance, and the high heat release, the fast temperature rise and the short service life.

This utility model belongs to the field of knife sharpener technology, and in particular to a replaceable manual knife sharpener, comprising a first housing and a second housing. A detachable magnetic connector is provided between the first and second housings, and the first and second housings, when connected, form the knife sharpener housing. A mounting groove is provided at the lower end of the knife sharpener housing. A limiting plate is integrally formed on the inner surface of the lower end of the knife sharpener housing, and a magnet is adhered to the surface of the limiting plate. An iron sheet attracted by the magnetic force of the magnet is provided on the surface of the mounting groove, and a sharpening blade is adhered and fixed to the lower surface of the iron sheet. The detachable connection between the first and second housings is achieved through the magnetic connector, allowing for quick disassembly or assembly of the knife sharpener housing without the need for tools. This not only facilitates the inspection and maintenance of internal components but also reduces space occupation during storage. Compared to traditional bolt fixing, the disassembly and assembly efficiency is improved by more than 50%.

The present invention relates to the technical field of support platforms, and specifically to a drilling and blasting platform frame. The drilling and blasting platform frame comprises: a main frame; an operating platform, which is at least partially formed on the main frame and is suitable for supporting operating personnel and / or operating equipment; a rotating bracket, one end of which is rotatably connected to the main frame, and the other end is supported and arranged on the ground, and the rotating bracket includes a yielding state parallel to the extension direction of the main frame, and an operating state set at an angle to the extension direction of the main frame. The drilling and blasting platform frame provided by the present invention realizes an organic combination of the two functions of "platform frame moving space" and "full-section simultaneous drilling and blasting", and solves the contradiction and defect of the common drilling and blasting platform frame that cannot simultaneously take into account the passage of mechanical equipment under the main frame and the need to temporarily set up an operating platform in the middle of the tunnel section; and improves the working efficiency.

The utility model relates to a connection mode, in particular to a wiring terminal convenient to connect, which comprises a wiring terminal assembly, and the wiring terminal assembly comprises a wiring terminal and an outer cover. The outer cover is provided with at least one inner cavity hole, the wiring terminal is clamped in the inner cavity hole, the outer cover is installed on the wiring terminal and used for protecting the wiring terminal, meanwhile, whether a wire rod is clamped in place or not can be observed conveniently, connection is facilitated, and meanwhile the stability of a product can be improved.

This application discloses a distance detection module and an electronic device, belonging to the field of distance detection technology. The distance detection module includes a support component, a light-emitting component, a photosensitive component, and an encapsulation component; the support component has a triangular longitudinal cross-section and is provided with a first mounting surface, a second mounting surface, and a bottom surface. A light-shielding portion is provided between the first mounting surface and the second mounting surface, and the light-shielding portion is located on the side of the support component away from the bottom surface; the light-emitting component is disposed on the first mounting surface for emitting light; the photosensitive component is disposed on the second mounting surface for receiving light; the encapsulation component is encapsulated on the outside of the photosensitive component and the light-emitting component, and the light-shielding portion protrudes from the encapsulation component.

This utility model discloses a contactor housing structure and a contactor. When the upper cover and the base are closed, the first and second plug-in plates on the side sealing plate are respectively inserted into the first and second slots of the base. This not only completes the vertical docking of the upper and lower housings, but also achieves a deep horizontal fit at the connection between the upper cover and the base. The L-shaped plug-in structure provides a robust and reliable support for the housing body, directly transferring the lateral expansion force that may be generated at the terminal block to the more robust overall structure of the base through the plug-in plates, thereby effectively resisting deformation and preventing the housing from expanding. The L-shaped plug-in method changes the connection between the upper cover and the base from surface contact positioning to three-dimensional interlocking positioning, greatly increasing the contact area and mechanical interlocking strength at the connection of the housing body, which makes the overall rigidity of the housing body higher and more stable.

The invention discloses a small-diameter, large-pitch and large-lead screw tooth profile and a design method, and relates to the technical field of screw nut transmission, the small-diameter, large-pitch and large-lead screw tooth profile comprises two half tooth profiles, each half tooth profile is formed by sequentially connecting an MA section, an AB section, a BC section, a CD section, a DE section and an EF section, F points in the two EF sections coincide, and an M point is arranged on the inner circular ring side of a screw; the MA section, the BC section and the DE section are all arc sections, the AB section and the EF section are elliptical arc sections, and the CD section is a linear section; the arc section and the elliptic arc section are sequentially arranged at the two ends of the CD section, the fluency of the tooth-shaped edge of the lead screw is uniform, the fluency uniformity is good when a nut and the lead screw move relatively in the use process, the contact part of the tooth surface is the CD section, and the portions, at the two ends of the CD section, of the tooth-shaped part are each provided with an elliptic arc structure, so that the size of the CD section is increased, and the service life of the nut is prolonged. The length of the contact line is slightly larger than half of the tooth height, the contact area is increased, the tooth surface contact strength is improved, and the tooth surface bearing capacity is improved.