48results about How to "Guaranteed grounding" patented technology

The invention provides a steel wire quenching heat treatment method. In steel wire quenching equipment, the two sides of a conductive heating roller are provided with wire pressing rollers, tension between the steel wire and the conductive heating roller is increased, so that normal contact between the steel wire and the conductive rollers is ensured when the steel wire moves; at the same time, a certain amount of electrolyte is added into a water-bath groove, so that conductive performance of an aqueous solution is improved, and a sparking problem between the steel wire and the conductive heating roller is solved; polymeric additives with different molecular weight including acrylic acid, sodium nitrate, common salt and an emulsifier is also added into the water-bath groove, so that the generation of martensite is avoided when the steel wire passes through the water-bath groove in a low speed, and quenching effect of the steel wire is ensured; and metal pipes of pipe fittings are all connected to the ground, so as to ensure application safety, and preventing accidents from happening.

An independent front suspension structure of an all-terrain four-wheel motorcycle comprises a shock absorber, a knuckle assembly, an upper suspension and a lower suspension. The upper suspension and the lower suspension are welded into a structure in a shape of a Chinese character 'ren' through suspension front rods and suspension lateral rods, two ends of the suspension front rods of the upper suspension and the lower suspension and extension ends of the suspension lateral rods are provided with knuckle bearings respectively, the upper suspension and the lower suspension are hinged to an upper portion and a lower portion of the same side of the knuckle assembly respectively through the knuckle bearings arranged at the head ends of the 'ren' shape, and a double-rocking-rod suspension structure is formed. The suspension front rod and the suspension lateral rod of the lower suspension are welded and fixed with an shock absorber support respectively, the shock absorber is arranged between the suspension front rods and the suspension lateral rods of the upper suspension and the lower suspension, and the lower end of the shock absorber is hinged to the shock absorber support through a bolt. The independent front suspension structure can effectively absorb shock generated by road surface conditions when a vehicle runs, keeps balance of a vehicle body at any time, improves all-terrain adaptation capacity of the whole vehicle, and achieves an all-terrain function of the vehicle. Simultaneously, riding comfortableness and cross-country ability are improved effectively.

The invention discloses an electronic expansion valve which comprises a valve body (1) and a coil (2), wherein the coil (2) is connected with a buckle (4) conductively connected with the valve body (1), the coil (2) comprises an electromagnetic polar plate (21), a stator housing (22) which is in conductive contact with the electromagnetic polar plate (21) and a non-conductive plastic housing (23) wrapped on the outer part of the stator housing (22), the buckle (4) is in further conductive contact and connection with a transition part, and the transition part is in conductive contact with the stator housing (22). Due to the adoption of a structure design, the electronic expansion valve can ensure that parts inside the coil (2) are grounded, therefore, the coil (2) can be prevented from being damaged due to a high-voltage or ultra-high voltage electric signal.

The present invention provides a microstrip circulator. The sufficient grounding of the circulator and an external circuit can be ensured, and therefore, the normal use of the microstrip circulator can be ensured. The microstrip circulator comprises a cylinder having a cover, and a bottom plate. Voidance grooves are formed at the ring surface of the cylinder having the cover. The bottom of the cylinder having the cover is fixedly mounted to the bottom plate. An in-cavity element is arranged in a cavity formed by combining the cylinder having the cover and the bottom plate. The microstrip circulator is characterized in that the bottom plate is made of a metal and plastic mixed material; the bottom plate is provided with metal connecting portions which are corresponding to the fixed mounting portions of the cylinder having the cover; a center metal connecting region is arranged at the center of the bottom plate; each metal connecting portion is connected with the center metal connecting region through metal wires / metal strips embedded in plastic; and at least one of the plurality of metal connecting portions and the center metal connecting region is connected with the external circuit through soldering.

The embodiment of the invention provides a free ground film, a circuit board and a preparation method of the free ground film. The free ground film includes a third conductor layer, an adhesive film layer, a first conductor layer, a conductive adhesive layer and a second conductor layer, wherein the first conductor layer, the conductive adhesive layer and the second conductor layer are sequentially stacked. The second conductor layer is provided with a protrusion on the side away from the conductive adhesive layer. The third conductor layer is arranged on the side, which is provided with the protrusion, of the second conductor layer. A protrusion part is formed at the site covered by the protrusion on the third conductor layer. The adhesive film layer is arranged on the side, which is awayfrom the second conductor layer, of the third conductor layer. When the free ground film is used for grounding of a printed circuit board, the electromagnetic shielding film is arranged on the printed circuit board. The free ground film and the electromagnetic shielding film are pressed together through the adhesive film layer. The protrusion part penetrates the adhesive film layer and the insulation layer of the electromagnetic shielding film and is electrically connected with the shielding layer of the electromagnetic shielding film. Interference charges accumulated on the shielding layer are effectively led out. An interference source formed by the accumulation of the interference charges is avoided, and thus the integrity of signal transmission is effectively ensured.

The invention relates to a distribution transformer grounding system, which is connected with a distribution transformer in the distribution network. The distribution transformer has an operation grounding point and a protection grounding point. The distribution transformer grounding system comprises an operation grounding device, a protection grounding device and a switch, wherein the operation grounding device is connected with the operation grounding point, the protection grounding device is connected with the protection grounding point, and the switch is connected between the operation grounding point and the protection grounding point so as to switch the grounding mode of the distribution transformer through opening and closing. The distribution transformer grounding system further comprises a control module which controls the switch to open and close, wherein the control module includes a remote signaling acquisition unit, a topology analysis unit, a grounding mode judgment unitand a remote control issuing unit. The distribution transformer grounding system can adjust the grounding mode according to actual requirements, thereby not only being capable of preventing users fromcontacting voltage dangers and improving the safety, but also being capable of ensuring the neural-point grounding safety and improving the reliability.

The invention discloses a grounding device for a lamp, which comprises two grounding terminals and screws; the grounding terminal comprises a pressing piece and two limiting arms symmetrically arranged on the pressing piece. There is a through hole on the pressing piece, and the two limit arms are bent and extended towards the same side of the pressing piece; the screws pass through the through holes of the pressing piece of the two grounding devices in turn and are screwed with the threaded holes; the limit of the two grounding terminals The direction of the arms is opposite, and the pressing piece of one of the grounding terminals is located between the two limiting arms of the other grounding terminal; the ground wire is pressed tightly between the pressing pieces of the two grounding devices. The grounding terminals are used in pairs, the limit arms of the two grounding terminals are facing oppositely, and the grounding wires are pressed tightly by the pressing pieces of the two grounding terminals, which can effectively prevent the grounding wire from rotating away from the metal post during assembly, and realize the grounding wire and the metal post conveniently and quickly. The connection between the metal posts; at the same time, the contact area between the pressing piece and the ground wire is large, which can ensure the effective grounding of the lamp. At the same time, the invention also discloses a lamp using the above lamp grounding device.

The invention relates to the technical field of electronics, and discloses an electromagnetic shielding film, a circuit board, and a preparation method of the electromagnetic shielding film. The electromagnetic shielding film comprises a plurality of convex particles, a first shielding layer, N second shielding layers, a third shielding layer, and an adhesive film layer, wherein the first shielding layer, N second shielding layers, the third shielding layer, and the adhesive film layer are successively stacked. The side, which is close to the adhesive film layer, of the first shielding layer is set as a flat surface. The convex particles are distributed between the first shielding layer and the second shielding layer and between the second shielding layer and the third shielding layer. Theside, which is close to the adhesive film layer, of the third shielding layer is a non-flat surface. The non-flat surface of the third shielding layer can pierce the adhesive film layer and is connected with the ground layer of the circuit board when the electromagnetic shielding film is laminated with the circuit board. Ground failure caused by the fact that the conductive particles of the adhesive film layer are pulled apart when the adhesive film layer of the existing electromagnetic shielding film is expanded at high temperature is avoided. The connection of the electromagnetic shieldingfilm and the ground layer of the circuit board is ensured.

The invention discloses a power transmission line grounding state intelligent sensing device. The device comprises a base, a sleeve is fixedly installed in the middle of the top end of the base, a sleeve rod is sleeved with the sleeve, a grounding ring is fixedly installed at the top end of the sleeve rod, a connecting wire is wound around and connected to the surface of the grounding ring, and aground pile is fixedly installed at the bottom end of the sleeve rod. The ground pile is connected with the center of the base in a penetrating mode, lifting mechanisms are fixedly arranged on the twosides of the sleeve, an alarm lamp is fixedly installed at the corner of one side of the top end of the base, a ground fault sensor is fixedly installed in the middle of one side of the top end of the base, and a display screen is fixedly installed on one side of the base. According to the invention, through the installed grounding fault sensor, whether the power transmission line is grounded ornot can be conveniently detected, the detected data is processed through the PLC and is distinguished through different colors of the alarm lamp, and the grounding of the power transmission line is ensured.

The invention provides a shielding device and a manufacturing method thereof. The shielding device comprises a plate-like cover and a frame, wherein the cover is provided with a top which is provided with at least one projected joint part projecting towards the frame; the frame is provided with a top and a side edge which downwards extends from the top, the top is provided with at least one joint interface corresponding to the projected joint parts of the cover, and the peripheral outline of each joint interface is the same as the peripheral outline of the corresponding projected joint part; and the projected joint part of the cover is jointed with the corresponding joint interface of the frame in an interference extrusion way to form an assembling structure of the cover and the frame. With the shielding device and the manufacturing method thereof, no side edge of the cover needs to be manufactured, thus the side edge space of the shielding device is prevented from being occupied, the cost of materials for manufacturing the side edge of the cover is saved, and zero fit-up gap is realized between the cover and the frame so that the grounding property and the shielding property of the shieldingdevice are ensured.

The invention relates to the field of electronic technology, and discloses an electromagnetic shielding film, a circuit board and a preparation method of the electromagnetic shielding film, wherein the electromagnetic shielding film comprises a first shielding layer, an insulating layer, a second shielding layer and an adhesive film layer, which are sequentially stacked, one surface of the secondshielding layer close to the adhesive film layer is a non-flat surface, the insulating layer is arranged between the first shielding layer and the second shielding layer to achieve multilayer shielding of interference signals on both sides of the electromagnetic shielding film, as a result, the interference signals on the both sides of the electromagnetic shielding film are effectively weakened, and the shielding effectiveness is improved accordingly.