11results about How to "Small dimensional tolerance" patented technology

The utility model relates to the field of automobile manufacturing, in particular to an automobile head anti-collision beam bending forming tool which comprises a product upper portion pressing mechanism and a support, a rotating shaft is arranged in the middle of the support, the rotating shaft and a swing block are coaxially fixed, and a swing block sliding seat is fixed to the portion, on the upper side of the rotating shaft, of the support. Reset tension springs are connected between the two sides of the swing block sliding seat and the corresponding lower swing blocks, and lower pressing plates are fixed to the bottom faces of the swing blocks. The lower product forming die is matched with the upper product pressing mechanism, is of an arc-shaped structure and is mounted on the die fixing seat, and a fixed product is mounted on the surface of the upper product pressing mechanism; according to the device in the prior art, as positioning or clamping mechanisms are not arranged in the middle and on the two sides of a product during machining, the middle of the product is prone to concave or convex deformation when the product is bent; the problem that the product is unqualified due to the fact that the processing parts on the two sides of the product are prone to asymmetric bending deformation is solved; and the problem that the adjustability is poor due to the fact that processing detail parameters cannot be adjusted by a pressing block is solved.

The invention discloses a relay, which comprises a shell, a magnetic circuit part, a contact part and a pushing part, and is characterized in that the magnetic circuit part is mounted on the shell and comprises at least two magnetic circuit units; the contact part is arranged on the shell and comprises a movable spring group, a static contact group and a load terminal; the movable spring groups and the static contact groups are arranged corresponding to the magnetic circuit unit, and each movable spring group is provided with a movable contact group corresponding to the static contact group; each movable spring group and the corresponding static contact group jointly form a switch; the movable spring group and the static contact group in each switch are respectively connected with different load terminals, and at least one load terminal is shared by at least two switches and forms a common terminal; and the pushing part comprises a pushing piece accommodated in the shell, the pushing piece and the magnetic circuit unit are correspondingly arranged, and the pushing piece is driven by the corresponding magnetic circuit part to drive the corresponding movable spring group, so that the movable contact group and the corresponding static contact group are closed or opened. By adopting the technical scheme, the occupied space is smaller than that in the prior art for realizing the functions of more than two switches.

The invention discloses a mold and a method for injection molding of a spout of a thermos flask. The mold comprises an upper mold core assembly and a lower mold core assembly which can be loaded on a mold frame, the upper die core assembly comprises an upper die core which forms an upper convex die on a die closing surface; the lower die core assembly comprises a lower die core forming a lower male die on the die closing face and three side die mechanisms arranged on the peripheral side of the lower male die. During die assembly, the three side die mechanisms can be mutually and laterally spliced and are matched with the lower male die and the upper male die to form a die cavity; the upper mold core is provided with a first core pulling mechanism which can extend into the mold cavity to form the lower clamping groove; the lower male die is provided with a second core-pulling mechanism capable of extending into the die cavity to form an upper clamping groove and a third core-pulling mechanism capable of forming a matching groove. During mold closing, a complete mold cavity can be formed, a core pulling mechanism is matched to synchronously stretch into the mold cavity to form a key structure, one-time injection molding of a spout is achieved, defects are reduced, and therefore the product quality is improved.

The invention discloses a forming tool, a forming method and an application of a bonded NdFeB magnet, wherein the forming tool comprises an upper punch, a middle die and a lower punch which are coaxially arranged from top to bottom in sequence and a core rod arranged in the lower punch, wherein the outer wall of the core rod, the inner wall of the middle die, the bottom surface of the upper punch and the top surface of the lower punch enclose a die cavity; the upper punch is composed of an integrally formed upper support portion and an upper punch, wherein the radius of the upper punch is 1-2 mm larger than the radius of the upper support portion, the lower punch is composed of an integrally formed lower support portion and a lower punch, wherein the radius of the lower punch is 1-2 mm larger than the radius of the lower support portion, the gap between the upper punch and the inner wall of the middle die is greater than the gap between the lower punch and the inner wall of the middle die, and the draft angle of the middle die is 89.90-89.99°. The finished bonded NdFeB magnet produced has a dimensional fluctuation of 0.15-0.25%. Density fluctuation is 0.7-0.8%, magnetic eccentricity (0.02-0.15) / 100mm.

The invention discloses a longitudinal electric connecting piece based on a printed circuit board. The longitudinal electric connecting piece comprises a layered insulation structure and a metal connecting piece arranged in the layered insulation structure. At least one end of the metal connecting piece is provided with an easy-to-deform part exposed out of the layered insulation structure, and the easy-to-deform part is exposed out by etching the layered insulation structure on the printed circuit board. On the other hand, the invention discloses application of the longitudinal electric connecting piece based on the printed circuit board. The longitudinal electric connecting piece is applied to a power module. When the structure is assembled to a power module and the like, press fit and leveling of an assembly structure are facilitated, and the flatness of an assembly body can be effectively improved; in addition, the welding area can be effectively increased, a welding exhaust channel is provided, a welding spot crack propagation path is blocked and the like, the connection reliability can be effectively improved, and due to the existence of the easily-deformed part, the service reliability in severe environments such as high vibration and high temperature change range can be improved.

The invention discloses a longitudinal electric connecting piece based on a printed circuit board. The longitudinal electric connecting piece comprises a layered insulation structure and a layered metal connecting piece arranged in the layered insulation structure. At least one end of the layered metal connecting piece is provided with an end bonding pad exposed out of the layered insulating structure, and the surface of the end bonding pad is in a wave shape. On the other hand, the invention discloses application of the longitudinal electric connecting piece based on the printed circuit board. The longitudinal electric connecting piece is applied to a power module. According to the invention, the width, spacing and the like of the end pads can be greatly reduced, the number of fan-out pins is effectively increased, the interconnection density is improved, the welding area can be effectively increased, a welding exhaust channel is provided, a welding spot crack propagation path is blocked and the like, and the connection reliability can be effectively improved.

The spoke is in a long strip shape and comprises connecting parts arranged at the two ends in the width direction and a reinforcing part located in the middle, and the reinforcing part is connected with the connecting parts at the two ends through two web plates located on the two sides of the reinforcing part correspondingly; the rotating wheel is used for a dehumidifier or a heat recovery machine, a plurality of spokes are arranged on the rotating wheel, the spokes are connected to the rotating wheel through lead screws penetrating through connecting holes of the spokes, and the reinforcing part and the connecting part are integrated.

This utility model discloses a valve sleeve integrated hot nozzle, relating to the field of hot runner technology. It includes a hot nozzle body with a hot runner channel inside. The hot runner channel has a main flow channel, a primary flow channel, and secondary flow channels connected sequentially. The main flow channel is arranged along the central axis of the hot nozzle body. Multiple secondary flow channels are arranged in a ring around the central axis of the hot nozzle body. Multiple primary flow channels are arranged, each corresponding to one of the secondary flow channels, and flow obliquely or branching from the main flow channel to guide and divert molten plastic in the main flow channel to the secondary flow channels. Each secondary flow channel is equipped with a valve control assembly, which includes a valve needle and a valve sleeve. The valve needle is movably inserted into the valve sleeve, and the opening and closing of the discharge hole at the bottom of the secondary flow channel is controlled by the axial sliding of the valve needle relative to the valve sleeve. This helps to reduce the dimensional tolerances of multi-cavity injection molded parts.

The present invention provides a button soft-pack lithium battery and an assembly method thereof, comprising a soft-pack battery cell and a shell, wherein the soft-pack battery cell comprises a battery cell body, a positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet and the negative electrode sheet are used to draw current from the battery cell body; the shell comprises an insulating shell, a positive electrode shell and a negative electrode shell, wherein the positive electrode shell and the negative electrode shell are both conductive; the positive electrode shell and the negative electrode shell are respectively installed at the upper and lower ends of the insulating shell to encapsulate the soft-pack battery cell in the shell; the positive electrode sheet is conductively connected to the positive electrode shell, and the negative electrode sheet is conductively connected to the negative electrode shell; the positive electrode sheet is first welded to the positive electrode shell, the negative electrode sheet is welded to the negative electrode shell, the positive electrode shell and the negative electrode shell are moved, and then the shell is assembled, and finally an insulating sleeve is installed. The button soft-pack lithium battery and the assembly method thereof provided by the present invention encapsulate the soft-pack battery cell in the shell, so that the outline size of the shell becomes the outline size of the button soft-pack lithium battery, thereby reducing the dimensional tolerance of the button soft-pack lithium battery and facilitating installation and use by users.

The relay comprises a shell and a pushing piece, the shell is provided with two sliding grooves corresponding to the pushing piece, the sliding grooves are distributed in the Y-axis direction and extend in the Z-axis direction, and the two sides, in the Y-axis direction, of the pushing piece are in sliding fit with the corresponding sliding grooves in the Z-axis direction; the groove walls of the two sliding grooves are in limiting fit with the pushing piece in the Y-axis direction and the X-axis direction. By adopting the technical scheme, compared with a relay in the prior art, the impact resistance is improved.

The utility model discloses an anti-short circuit structure and a relay. The anti-short-circuit structure comprises a switch and a pushing unit. The switch comprises a movable contact piece and a static contact piece; the pushing unit comprises a pushing body and a first elastic piece; the pushing body is driven by a driving part with an in-place locking function or driven by a transmission mechanism with a mechanical self-locking function so as to push at least one movable contact piece to be connected or disconnected with the static contact piece; the first elastic piece is arranged corresponding to the closing direction of the movable contact piece and is arranged between the pushing body and the movable contact piece so as to provide contact pressure for closing the static contact piece to the movable contact piece when the movable contact piece and the static contact piece are closed; the pushing body is provided with a first limiting part, and the first limiting part is arranged corresponding to the closing direction of the movable contact piece and makes contact with or gets close to the movable contact piece in the closing direction of the movable contact piece when the movable contact piece and the static contact piece are closed. The relay adopts the anti-short-circuit structure. The anti-short circuit structure provides a configuration different from that in the prior art.