42results about How to "Improve contact stiffness" patented technology

The embodiment of the invention provides a charge output element and a ring-shaped shearing type piezoelectric acceleration sensor which comprises a base, a piezoelectric element, a mass block, a pre-tightening part and a locking part, wherein the base comprises a supporting part, a connecting part and an installing hole; the piezoelectric element is sheathed outside the connecting part, and a ring-shaped gap is formed between the piezoelectric element and the connecting part; the mass block is sheathed outside the piezoelectric element; the pre-tightening part is inserted into the ring-shapedgap; the locking part is provided with a columnar part and a blocking part which are connected; all the elements are locked by matching of the columnar part and the installing hole; and the blockingpart abuts against a first end so as to lead the pre-tightening part to provide a radial pre-tightening force for fastening the piezoelectric element, the mass block and the base. The charge output element and the ring-shaped shearing type piezoelectric acceleration sensor provided by the embodiment of the invention have the advantages that due to rigid contact between the charge output elements,the contact rigidity of the whole structure can be greatly improved, and adhesion is not needed, so that the installation period of the charge output elements is effectively shortened.

The invention discloses a corner three-way connector and a mounting method thereof, relates to hardware accessories, and aims at solving the problem of low structure stability of a connecting structure of an existing three-way connector. The corner three-way connector comprises a connector body, and connecting supporting legs which are fixedly connected to the connector body, wherein a fixing structure is arranged on each connecting supporting leg and comprises a mounting hole which is formed in the connector body and passes through the connector body and any one of the connecting supporting leg, an adjusting part which is mounted in the mounting hole, an elastic expansion body which sleeves the adjusting part, and an extruding part which is in thread connection with the adjusting part; the sections of the elastic expansion bodies, the extruding parts, the connecting supporting legs and inner cavities of steel pipes are of polygon shapes which fit each other; after being expanded, theelastic expansion bodies can be extruded relative to the inner walls of the steel pipes, and thus the elastic expansion bodies can move relative to the corresponding steel pipes; the elastic expansionbodies are fixed relative to the corner three-way connector, so that the corner three-way connector is hard to move relative to the steel pipes, and as a result, the stability of the connecting structure is improved.

The invention discloses a novel harmonic-reducer input transmission structure. The novel harmonic-reducer input transmission structure comprises a cam connected with an input shaft, and the cam is sleeved with a flexible gear; a steel gear is engaged with the flexible gear, outer teeth are arranged on the flexible gear, inner teeth are arranged on the steel gear, and the flexible gear is engaged with the steel gear through the outer teeth and the inner teeth; a keeping frame is arranged between the flexible gear and the cam, and a cylinder roller is installed in the keeping frame; annular flanges are formed inside the flexible gear and outside the cam in an outward-protruding mode, and C-shaped grooves matched with the cylinder roller are formed in the annular flanges; the annular flanges are located on the outer-tooth side of the flexible gear. By means of the novel harmonic-reducer input transmission structure, the assembly stress of a key part of a harmonic reducer is reduced or eliminated, the engaging stress of the steel gear and the flexible gear in the movement process is reduced, the input structure and the output structure of the harmonic reducer are newly designed, the movement of the harmonic reducer is more stable during working, and the service life is prolonged.

The invention discloses a ball screw pair capable of automatically adjusting pretightening force and belongs to the technical field of pretightening force control of ball screw pairs. By the adoption of the structure, the pretightening force can be adjusted according to the types of screws and it is guaranteed that the value of the pretightening force is constant in the operation process of a ball screw. A pretightening force adjusting device is an inflated rubber air bag or a hydraulic oil rubber air bag. The pretightening force adjusting device is simple and compact in structure, high in reliability and high in operability. In addition, the pressure intensity of compressed air or oil pressure can be adjusted to adapt to ball screw pairs of different types and the contact rigidity between the ball screw and a roller path is improved; according to the automatic pretightening force adjusting device (the rubber air bag), impact on the screw by nuts can be relieved when the ball screw pair is suddenly stopped or started, and vibration and abrasion of the ball screw pair are reduced.

The invention discloses a erect grinding head. It includes: the planker(1), slide (2), erect motor(4) with millstones(3) of its bottom, and the slide (2) includes ram (5), drive devices(6), slide pillar(7). The planker(1) is connected with the ram (5)of the slide (2) by the rotation adjustment, the bottom of said slide pillar(7) is connected rotationally with the bottom of the swinging board (8),the surface shaped by the rotation of the swinging board (8)around the slide pillar(7)and the surface shaped by the rotation of the slide (2) around the planker(1) through the rotation adjustment are vertical; the upside of the sliding pillar (7) and the upside of the swinging board (8) are linked with the adjustable device which can regulate the rotation of the swinging board (8) certain anglerelative to the sliding pillar (7). Said erect motor (4) is linked with said swinging board (8). The erect grinding head heightens the precision of the machining face and processes mesh pattern with nice appearance when millstones processes workpiece.

The invention provides an indexing and positioning mechanism for a turret tool holder, which includes a main shaft and a box body, and the box body is arranged around the main shaft. Set on the front end of the main shaft, the cutter head is installed on the movable toothed plate, the positioning plate is set on the box body, the locking toothed plate is set on the main shaft body and can move along the axial direction of the main shaft on the main shaft body, and the locking toothed plate passes through The conical teeth arranged at the front end mesh with the movable toothed plate, and the locking toothed plate is connected with the positioning plate through the guide positioning pin. The invention has reasonable structure and obvious effect.

The invention belongs to the technical field of bulk material transport equipment and particularly relates to a trolley group towed type adhesive tape conveyor. The problems are solved that existing adhesive tape conveyors have a large difference in tension of adhesive tapes, the running adhesive tapes deviate and are unsafe, the running resistance is large, and the energy consumption is high. Theadhesive tape conveyor comprises a fixed bearing rack, a driving device, a traction mechanism and a guiding mechanism, wherein the driving device, the traction mechanism and the guiding mechanism aredisposed on the fixed bearing rack; the traction mechanism pulls a trolley group sprocket chain to move horizontally on the rack when a machine head guide rail sprocket wheel rotates so that trolleygroup sprocket trolleys can move along a guide rail, and the adhesive tapes are moved forward simultaneously, so that transport of materials is achieved. The adhesive tapes are in fraction with trolley supports to transmit a traction force, and the adhesive tapes run along with a belt conveyor body under the action of the traction force of the trolleys; since the trolleys are distributed at intervals, segmental traction is achieved, and the difference in the tension of the adhesive tapes is small. The low-strength adhesive tapes can be selected, and the investment cost of the adhesive tapes isreduced.

The invention discloses a worm provided with a double-involute-arc tooth profile and belongs to the technical field of worm wheel and worm transmission. The worm comprises a worm body and a worm tooth part. The worm tooth part is arranged in the middle of the worm body. The tooth profile of the cross section of the worm tooth part is in an involute arc shape. The tooth profile of the shaft cross section of the worm tooth part is also in an involute arc shape, thus, the worm composite arc tooth profile is formed and matched with a worm wheel tooth profile, the worm composite arc tooth profile is provided with an oil containing gap in the reference circle, and the portions close to the upper side and the lower side of the reference circle are in smooth coincidence contact along the worm wheel tooth profile to achieve meshing transmission. By means of selection and recombination of two involute arc segments of the cross section and the shaft cross section, the contact area can be increased, and contact stress is reduced. Meanwhile, oil containing space distribution is more reasonable, power of a transmission pair is increased, lubricating performance of the transmission pair is improved, multiple adverse factors in worm wheel and worm transmission are reduced greatly, and the application effect is improved.

The invention discloses an electrodeless car unit chain multi-point driving belt type conveyor and a chain tensioning method. The conveyor comprises a bearing machine frame, a machine head driving device, a multi-point driving transmission mechanism and a bearing rail used for bearing the operation of the multi-point driving transmission mechanism; the bearing rail, the machine head driving device and the multi-point driving transmission mechanism are arranged on the bearing machine frame; a conveyor belt of the conveyor is driven by an electrodeless closed annular car unit chain; and the car unit chain is driven by a multi-point chain wheel, so that the maximum tension of the chain is reduced, and the tension of each chain segment of the car unit chain is ensured by adopting a segmented tensioning mode. The maximum tension of the chain is effectively reduced by the drive of the multi-point chain wheel, so that the stress of the machine frame during turning is improved, the carrying capacity of the chain and the conveying distance of the conveyor are improved, and the method is suitable for the development direction of large transport capacity and long transport distance of the conveyor; and the segmented tensioning method is adopted, so that the required tension of the car unit chain can be obtained, the tensioning adjusting amount of a machine tail is small, and the method is suitable for installing, adjusting and testing and maintaining of the long-distance conveyor.

The invention relates to the field of a double-faced grinding / polishing machine, in particular to a planetary transmission structure of a double-faced grinding / polishing machine. The planetary transmission mechanism for the double-faced grinding / polishing machine comprises a planetary wheel (5) meshed with a gear ring (2), wherein the planetary wheel (5) is meshed with a sun wheel (7) and is arranged on a lower plate (6); a circle of gear ring pin teeth (3) are uniformly arranged on the inside surface of the gear ring (2); a tooth pitch is formed between two gear ring pin teeth (3); and the gear ring (2) is meshed with the planetary wheel (5) through the gear ring pin teeth (3). The invention has the advantages that because the pin tooth transmission is adopted, the cost of materials and the processing cost of an inner gear ring are reduced; the problem that the processing difficulty is increased because the size of the gear ring is increased is solved, and the problems of inconvenient maintenance and high using cost after the teeth are worn in the using process are solved; and simultaneously, because each pin tooth is in the shape of a circular arc and the meshing line is long, the contact rigidity of a part is improved, and the service life of the part is prolonged.

The present application relates to a three-dimensional printed product, a manufacturing method thereof, and a support fixture. The three-dimensional printed product manufacturing method includes: using a first water-soluble material to print a support layer; on the support layer, using a forming material to print a target product ; On the target product, a cover layer is printed with a second water-soluble material to cover the surface of the target product. The above-mentioned manufacturing method of a three-dimensional printed product can reduce the surface roughness and improve the surface flatness without adding additional subsequent processing processes, and is especially suitable for products with thin thickness; on the one hand, it is beneficial to improve wear resistance, Product indicators such as clearance fit connection strength, fatigue strength, contact stiffness, etc.; on the other hand, it is conducive to stacking to achieve a close positional relationship and improve the stability of the final product structure; on the other hand, it is conducive to reducing model cost overhead and process time, reducing new High cost caused by product redesign, mold repair, and mold opening in the product development stage.

The invention discloses a BT knife handle high-speed cutting mechanism and a use method and belongs to the technical field of numerically-controlled machine tool cutting machining. The BT knife handle high-speed cutting mechanism comprises a BT knife handle, a main shaft, a knife pulling mechanism, a pop-rivet and a cushion cover, wherein the end face of the non tool installation end of the BT knife handle is a knife handle rear end face, a circular cone frustum is arranged on the center position of the knife handle rear end face, the pop-rivet is installed on the center position of the end face of the circular cone frustum, the main shaft is a hollow shaft, the end face of the end, close to the rear end face of the knife handle, of the main shaft is a main shaft front end face, a taper hole is formed in the center portion of the main shaft front end face, the shape of the taper hole is matched with that of the circular cone frustum, the circular cone frustum is installed in the taper hole, the cushion cover is arranged between the knife handle rear end face and the main shaft front end face, the knife pulling mechanism is installed in a main shaft center cavity, and the knife pulling mechanism is connected with the pop-rivet in a clamped mode. By means of the BT knife handle high-speed cutting mechanism and the use method, the high-speed cutting of the BT knife handle is achieved, the contact rigidity and the repeated positioning accuracy of the BT knife handle are high, the high-speed cutting machining precision and the efficiency are high, the service lives of a tool and a machine tool are prolonged, and the BT knife handle can replace an HSK knife handle to be used.