38results about How to "Easy and reliable operation" patented technology

A tonneau cover for selectively enclosing a space within a cargo box. The cover includes a substantially rigid panel provided with an elongate channel laterally extending between a proximate end located proximate a side edge of the cover and a distal end at which the channel terminates. The cover includes a clamp mechanism slidably engaged with the channel, and the clamp mechanism includes a handle, a block member slidably received in the channel, an elongate rod member coupled to the handle, and a latch or hook member connected to the rod member. The latch member is moveable between a clamped position for operatively engaging a portion of the cargo box and a released position for spacing the latch member from and placing the latch member out of operative engagement with the cargo box. The handle and rod member are positioned in the channel in the clamp mechanism stowed position. Also a clamp mechanism, and a method of operating a clamp mechanism.

The invention relates to the mechanical field of the well drilling engineering, and in particular relates to an automatic operation device of the upper drill floor and the lower drill floor of a drill rod. The technical scheme is as follows: the automatic operation device of the upper drill floor and the lower drill floor of a drill rod comprises a ramp, a catwalk, a catwalk support frame and a catwalk car in sliding fit with the catwalk, wherein the ramp is provided with the ramp car in sliding fit with the ramp; the butt joint position of the lower end of the ramp and the catwalk is respectively provided with a ramp pushing and blocking mechanism and a turnover mechanism; the catwalk close to the turnover mechanism is provided with a lifting mechanism; the middle of the catwalk is provided with at least two drill rod pushing and disassembling mechanisms at intervals; and all operation mechanisms in the device can be connected to the controller in a wired or wireless mode. The automatic operation device has the characteristic of reasonable structural design, is convenient and reliable to control, saves manpower and is efficient and safe.

The invention relates to the technical field of beverage extraction, in particular to an automatic bag dropping device after a coffee bag in a coffee machine is used, and an automatic bag dropping device for a flexible package coffee bag in the coffee machine. The automatic bag dropping device for the coffee bag in the coffee machine comprises a base, a machine part 1 and a machine part 2 which are arranged in the base, and a driving mechanism, and is characterized in that: the machine part 1 which is provided with an outlet capable of providing coffee liquid and a brewing chamber is fixed at one end of the base; the machine part 2 which is driven to horizontally slide by the driving mechanism, is provided with a high-temperature water inlet pipeline and can extract coffee with the machine part 1 closely is fixed at the other end of the base; and a coffee bracket which can make the coffee bag slide and stand and drives a rear guide rod and a front guide rod to drop the coffee bag through the driving mechanism and the machine part 2 is arranged between the machine part 1 and the machine part 2. The device has a reasonable design, a simple structure and low manufacturing cost, is easy and convenient to operate when used, is integrally small and delicate and has small occupied space.

The invention relates to refrigeration equipment, which comprises a box body (1), a door (2) and a hinge assembly (3). The hinge assembly (3) comprises hinge frames (31, 41), a hinge shaft (32) and block bars (30, 40, 50) fixed to the hinge frames (31, 41); and the block bars (30, 40, 50) are used for limiting a maximum opening angle of the door (2) relative to the box body (1). The block bars (30, 40, 50) are suitable for moving in a horizontal direction along the hinge frames (31, 41) so as to adjust the maximum opening angle of the door (2). A user can automatically adjust the block bars (30, 40, 50) to move in the horizontal direction according to a requirement of an installation space, so that the maximum opening angle of the door (2) relative to the box body (1) is changed.

This invention discloses a DC motor with externally mounted carbon brushes, comprising a front end cover, a housing, magnet, a rotor, a commutator and a back end cover, characterized in that the outer wall of the back end cover is provided with two mounting holes for brush brackets which are mounted with annular brush brackets having identical structures, a radial sliding tube used to mount the carbon brush is located in said brackets, said carbon brush in the sliding tube for carbon brush contacts the commutator by a spring biasing against a brush cap, the outward end thereof being connected to a copper sheet through a brush shunt, said copper sheet is held against the back end of the sliding tube, a lead wire for a power source is lead out from an outlet of another copper sheet at an outer wall of the sliding tube. The electrical connection of the carbon brush is lead out from the sliding tube through the brush shunt and the copper sheet, therefore the electrical connection is reliable. The present invention is simply constructed and easily mounted, the volume thereof is small, the operation thereof is reliable, it is easy to maintain and replace the carbon brushes and it extends significantly the life of the motor.

The invention belongs to the field of gas-solid fluidized bed reactors, and relates to an acousto-optic coupling annular gap photocatalytic fluidized bed VOCs (volatile organic compounds) degrading device. A main body comprises a gas outlet, a gas inlet, a gas inlet pre-distribution plate (inner ring) and a catalyst grain baffle plate (outer ring), an organic glass tube, a quartz glass tube, an ultraviolet lamp, a reactor gas inlet distribution plate, a lamp tube mounting base, a test port, a loudspeaker, a fan, a gas collocation device, a sound wave amplifier, a signal generator, a gas collecting chamber, a gas premixing chamber, a gas inlet passage, an annular gap fluidized bed reaction area and a gas distribution chamber; and the devices form the photocatalytic gaseous contaminant VOCs degrading device with a columnar nested structure through principle reliability combination. The device has the advantages of wide operation area, reliable and convenient operation, simple regeneration of catalyst grains, low oxidation selectivity on gaseous contaminants, good treatment effect and prominent stable fluidization; and reactors can be connected in series or in parallel for use, and the device is suitable for high-concentration VOCs places.

The invention discloses a fiber array coupling output device, system and method for a single photon source device, and the device comprises a single photon source device sample piece provided with a plurality of single photon source units, wherein the single photon source units can emit single photons; and an optical fiber array which comprises a plurality of optical fibers and is coupled to the upper surface of the single photon source device sample piece, wherein one or many optical fibers in the optical fiber array are coupled to the single photon source units. The device is simple, convenient and reliable.

The invention relates to the technical field of drinks extraction, in particular to an automatic dropping device in a coffee machine after a coffee bag is used. The automatic dropping device of a coffee machine comprises a base, a member I and a member II in the base, and a drive mechanism, and is characterized in that the member I capable of providing high-temperature water is fixed at one end of the base, the member II capable of sliding horizontally under the drive of the drive mechanism and closed for the member II as well as comprising a brewing chamber is fixed at the other end of the base, and a coffee bracket which enables the coffee bag to slide in, hang and drop out is arranged between the member I and the member II. Because the member I is fixed at one end of the base, the member II is fixed at the other end of the base, the coffee bracket is arranged between the member I and the member II, all parts are arranged in the base and all parts act in the base when the coffee machine works, the automatic dropping device has the advantages of simple structure and small occupied space. In addition, the member II horizontally slides and is closed with the member I, thus the action is simple and reliable.

The invention discloses an online detection device for knitted socks. The device comprises a conveying device and a detection device, the conveying device comprises a conveying frame, a conveying belt and a conveying baffle, and the detection device comprises a detection frame, a high-speed camera, a sorting manipulator, a position sensor and a control box which are sequentially arranged in the direction of the conveying belt. A to-be-detected product and a casual inspection product are conveyed through the conveying belt of the conveying device, after the position sensor detects a signal, the high-speed camera shoots a product picture, picture information is fed back to a tool microcomputer to be compared with a standard picture, whether products are qualified or not is discriminated, and unqualified products are grabbed and removed through the sorting manipulator. The qualified products are labeled through a labeling roller, photoelectric sensors at the two sides respectively carry out statistics on the total number of the detected products and the number of the qualified products, the device is simple in overall structure and convenient and reliable in action, rapid assembly line detection of knitted sock products is achieved, the detection efficiency is improved, the detection labor cost is reduced, and the product quality is guaranteed.

The invention discloses a bending handrail assembly of a minitiller. A transverse section at the front end of a handrail frame (1) is hinged with a protecting hood (2); a toothed plate (4) is fixed at the bottom of the transverse section at the front end of the handrail frame (1); a bayonet lock (5) is locked into a neck (4a) of the tooth plate; the bayonet lock (5) is arranged on a wrench (6); the front end of the wrench (6) is hinged with a base (3a); a tension spring (7) is arranged between the bayonet lock (5) and a handrail base (3); the bottom of the front end of the handrail base (3) is sleeved into a positioning column (10); a plurality of positioning holes (11b) are formed on a top plate (11a) of a riser base (11); the lower end of a lifting rod (13) extends inside a positioning pipe (12) and is connected with the upper end of an expansion head (14); the lower end of the expansion head (14) is inserted into one positioning hole (11b). By adopting the bending handrail assembly, the upper and lower heights and the left and right positions of the handrail frame can be adjusted according to the requirements; the bending handrail assembly is not only large in adjusting range, but also convenient and reliable to operate.

The invention discloses an injector clamping device for an injection pump. The injector clamping device comprises a shell, wherein a rotary transmission structure is arranged in the shell; one end of the rotary transmission structure is connected with a pressing plate, and the other end of the rotary transmission structure is connected with a potentiometer device; the pressing plate is matched with a groove formed in the shell through rotation in order to clamp an injector; the rotation angle of the pressing plate is transmitted to the potentiometer device through the rotary transmission structure; the potentiometer device converts the rotation angle of the pressing plate into the diameter of the clamped injector according to a setting. According to the injector clamping device for the injection pump, the rotation angle of the pressing plate is converted into the diameter of the clamped injector, so that the size specification of the injector can be identified accurately and conveniently.

The present application discloses an intelligent short-circuit grounding device, which includes an operating lever, wherein one end of the operating lever is connected with a conductor end; the conductor end is connected with a grounding end through a ground wire; the conductor end is equipped with an electric alarm and a lighting unit; a pressure sensor is disposed at the junction between the conductor end and a tested conductor; a control terminal box is disposed on a grounding end side; a control board is disposed in the control terminal box and is connected to the electric alarm, the pressure sensor, and the lighting unit. The intelligent short-circuit grounding device uses the Internet of Things technology, and is provided with the electric alarm, the pressure sensors and the lightingunit so as to achieve simple and reliable operations, avoids safety accidents caused by ground connection. The grounding method introduces comprehensive reminding by prompt tones and the electric alarm, the pressure sensor and the lighting units, which improves operation reliability and safety.

The invention relates to a touch control terminal and a touch detection device and a detection method thereof. The touch detection device comprises an ultrasonic device and a signal processing device.When the ultrasonic device is in the liquid environment, the touch terminal is ultrasonically scanned and surface pressure information is obtained, and an induction signal is generated according to the pressure information and the returned ultrasonic wave and sent to the signal processing device. The signal processing device obtains the liquid depth where the touch terminal is located and the touch information of the touch terminal according to the sensing signal. The liquid depth at which the touch terminal is located is detected, and the touch information is obtained by recognizing the touch action of the touch terminal through ultrasonic scanning, so as to facilitate the touch display operation. Simultaneously the touch information detection and the liquid depth detection are carried out, the operation is simple and reliable, even if the touch control terminal is in the conductive liquid, detection on the touch information can also be performed, thereby realizing the touch detection to the touch control terminal under the liquid environment.

The invention relates to a digital transmission box and a fault diagnosing system. The digital transmission box comprises a power supply module and a business and master control board card, wherein the power supply module comprises a switching mode power supply, a controllable direct-current power supply output interface and a controllable alternating-current power supply socket; the business and master control board card comprises a master control single chip microcomputer, an optical fiber exchange chip, an Ethernet interface, an exchange chip returning and energy storing circuit, a first control switch, a mains supply detection circuit and an output current detection control circuit master control single chip microcomputer. When direct current output by the switching mode power supply is zero, the mains supply detection circuit is controlled to detect mains supply at the input end of the switching mode power supply, and fault data is generated according to a detection result and sent to the optical fiber exchange chip. After the switching mode power supply powers down and breaks off, a mains supply access situation is detected, the fault data is output from the Ethernet interface through the optical fiber exchange chip, and an operator can accurately judge a fault type of a digital transmission box to timely overhaul the digital transmission box according to the fault type; thus, maintenance convenience is improved.

The invention relates to a 20-gear 20JS240T speed changer which comprises a front secondary box, a main box and a rear secondary box which are sequentially connected, wherein a shaft I and a shaft II which are sequentially connected are arranged in the front secondary box and the main box; a secondary box main shaft connected with the shaft II is arranged in the rear secondary box; a shaft gear I and a shaft differential gear I which are idly sleeved on the shaft I are sequentially arranged on the shaft I; a shaft gear II idly sleeved on the shaft II is arranged on the shaft II; a secondary box driving gear and a secondary box main shaft reduction gear which are idly sleeved on the secondary box main shaft are sequentially arranged on the secondary box main shaft; the secondary box driving gear is connected with the shaft II; and the gears mentioned above are in an radial floating state on the corresponding shafts. The speed changer provided by the invention is a heavy truck speed changer which can be simply and conveniently operated, is convenient to engage gear, saves oil, achieves environmental protection, has low noise, is comfortable for driving, improves the efficiency, and reduces the oil consumption.

The invention discloses a modern agriculture environment monitoring system which comprises a monitoring center connected with a remote computer. An ambient humiture detector, an illumination detector, a CO2 detector, a soil fertilizer detector and a soil humiture detector are connected with a monitoring center through a communication interface. A video monitor sends monitored information data to the monitoring center, the monitoring center sends command signals to a control cabinet, and the output end of the control cabinet is connected with a humiture adjusting module, an illumination adjusting module and a soil water and fertilizer adjusting module. The illumination detector is a light quantum sensor including a solar cell and an optical filter, and the CO2 detector is an infrared detector. The modern agriculture environment monitoring system allows an agriculture expert to remotely analyze and control a greenhouse environment and realizes smart management.

The invention discloses a chemical silver plating and deplating method for the surface of a ceramic copper-clad substrate. The preparation process comprises the following steps that S1, the ceramic copper-clad substrate is taken, and silver plating is carried out; S2, defective products are selected for deplating; and S3, the deplated ceramic copper-clad substrate is subjected to water washing, neutralization, water washing again and drying, and then silver plating is prepared. The deplating comprises the following steps of S1, preparing a deplating solution; S2, carrying out deplating, specifically, immersing the ceramic copper-clad substrate in the deplating solution, and introducing carbon monoxide into the deplating solution after deplating; and S3, carrying out ultrasonic treatment on the deplated ceramic copper-clad substrate for 3-5 minutes. By means of the chemical silver plating and deplating method, the prepared deplating solution solves the problem that secondary silver plating performance is affected due to incomplete deplating and local silver plating layer residues, and the phenomena of floating, pocking marks, pinholes, roughness, unevenness and the like caused by over-corrosion of the surface of the ceramic copper-clad substrate due to deplating are avoided; and elemental silver can be recycled by introducing the carbon monoxide, so that the cost is saved, and the prepared ceramic copper-clad substrate is good in heat resistance.

The invention relates to a use method for a B-scan ultrasonography physical examination cluster control system based on the intelligent navigation detection angle. The method is characterized by comprising the basis steps that 1, examined operation part angle simulation signals are collected; 2, recognizable video and audio signals are formed; 3, recognizable video and audio signal prompts are transmitted; 4, examined operation part angle simulation value signals are determined; 5, examined operation part angle image correct value signals obtained after correction is conducted is formed; 6, video and audio prompt signals needing to be corrected on the examined operation part angles are formed; 7, correction detection angles are reminded; 8, continuous monitoring on the correction detection angles is provided. The use method has the significant advantage of conducting cluster correction on B-scan ultrasonography image imaging part detection angles, so that the B-scan ultrasonography misdiagnosis rate is decreased conveniently, and the B-scan ultrasonography diagnosis quality and efficiency are improved conveniently.

The invention provides a retractable outdoor clothes hanger applied to the technical field of articles for daily use. The front part of a clothes hanger box (1) of the retractable outdoor clothes hanger is provided with an opening part (2) through which a clothes hanger rod piece can be retracted and stretched; a clothes hanger rod piece I (4) is movably mounted in the clothes hanger box (1) through a toothed rotating shaft I (3); a driving gear I (5) is meshed with the toothed rotating shaft I (3); a clothes hanger rod piece II (7) is movably mounted in the clothes hanger box (1) through a toothed rotating shaft II (6); and a driving gear II (8) is meshed with the toothed rotating shaft II (6). According to the retractable outdoor clothes hanger, the clothes hanger can be stretched and retracted conveniently and reliably, the situation that clothes are caught in the rain when the clothes hanger is stretched to air the clothes is effectively prevented, the clothes hanger is protected during retraction, rainwater is prevented from entering the lower part of the clothes hanger, the clothes hanger is effectively protected, and the service life and the use convenience of the clothes hanger are improved.

The invention discloses an automatic hydrogenation switch device and a fuel cell vehicle. The automatic hydrogenation switch device comprises a hydrogenation switch, a linkage pressing structure and an elastic piece, when a hydrogenation door of the fuel cell vehicle is closed, the elastic piece provides elastic force to enable the linkage pressing structure to abut against the hydrogenation door; and after the hydrogenation door is opened, the linkage pressing structure acts under the reset action of the elastic piece so as to press the hydrogenation switch. According to the scheme of the automatic hydrogenation switch device, disconnection and connection of the hydrogenation switch can be achieved in a linkage mode according to opening or closing of the hydrogenation door, so that automatic control over the hydrogenation switch is achieved, manual operation for connection and disconnection is not needed, operation is easy, convenient and reliable, and the situation that a low-voltage power source of the vehicle is used up due to the fact that the hydrogenation switch is forgotten to be closed due to manual reasons can be avoided.

The invention discloses a wetland sampling device based on ecological environment index evaluation, and relates to the technical field of wetland sampling devices. The sampling device comprises: an adjustable supporting table mounted on a wetland and a long sampling cylinder for sampling a soft soil layer of the wetland, and a driving device for driving the sampling long cylinder to move up and down is inserted into the adjustable supporting table. The adjustable supporting table comprises a polygonal platform plate; a supporting seat for mounting a driving device is fixed in the middle of each side surface of the platform plate; each corner of the platform plate is provided with a supporting assembly with the adjustable length; and the long sampling barrel comprises a plurality of sections of sample separation barrels which are in threaded connection, a feeding barrel which is in threaded connection with the sample separation barrel at the lowest end and a retaining plate which is inserted into the lower part of the sample separation barrel. The adjustable supporting table, the sampling long cylinder and the driving device are matched to form the systematic sampling device, vertical multi-point stable sampling is facilitated, operation is reliable and convenient, and the sampling device is suitable for sampling of a wetland soil sample layer.

The invention discloses an intertidal zone CO with controllable environmental conditions 2 The flux indoor simulation experiment device includes a biochemical incubator, an outer cylinder and a water storage tank. The outer cylinder is located in the biochemical incubator, and the outer cylinder is provided with an inner cylinder. The sediment samples collected in the field are layered into the inner cylinder. There is a permeable hole at the bottom of the inner cylinder, and a permeable hole on the inner cylinder. The permeable hole is located above the sediment sample. The outer cylinder is connected to the water storage tank through a peristaltic pump, and a sampling air chamber is arranged above the sediment sample in the inner cylinder. , the sampling gas chamber is connected with CO through the gas pipeline 2 Sensor connection, CO 2 The sensor is connected with the computer signal. A kind of environmental condition controllable intertidal zone CO of the present invention 2 Flux indoor simulation experiment device, which can simulate various temperature, light environment conditions and groundwater level indoors, and conduct long-term continuous observation of intertidal zone sediment CO 2 Flux provides a powerful means of observation and research for basic research on carbon metabolism and carbon cycle in wetland ecosystems.

The invention relates to a pressing mechanism of a testing floater in an oil consumption measuring device for vehicles. A pressing mechanism of an oil consumption measuring device of a vehicle oil tank comprises a hand-hold handle arranged on the upper part and a vertical testing pipe (7) arranged on the lower part, wherein a floater (6) is arranged in a pipe cavity of the testing pipe (7); a pressing plate (5) is arranged on the side part of the floater (6) and can move in the direction which is perpendicular to the axis of the pipe cavity between a floater (6) pressing position and a floater (6) loosening position; and the forces for pressing and loosening the floater by the pressing plate (5) are provided by a spring (3) and an inflation air bag (2). By adopting the pressing mechanism, structures of a pressing mechanism and a loosening mechanism of the floater are simplified, parts, machining assembly and the adjustment quantity are reduced, and the pressing mechanism is simple, convenient and reliable to move and is convenient, sanitary and safe to use.

The invention belongs to the platform lifting technology, and relates to a four-stand-bar synchronous hydraulic lifting mechanism. The four-stand-bar synchronous hydraulic lifting mechanism comprises a mounting vehicle body, four hydraulic stand bars, a hydraulic control box and a synchronous cylinder. The front part and the rear part of the left side frame and the front part and the rear part of the right side frame of the mounting vehicle body are respectively provided with one hydraulic stand bar with an actuator cylinder, the synchronous cylinder comprises four hydraulic chambers and four piston heads connected to a same piston rod, the outlets of the four hydraulic chambers are connected to the four hydraulic stand bars respectively, and the input end of the synchronous cylinder is connected to a hydraulic general oil way through a hydraulic control box containing a hydraulic check valve and a three-position four-way valve. The manual type four-stand-bar synchronous hydraulic lifting mechanism can work in working occasions with small height, the adjustment of the three freedom degrees of the synchronous lifting, the synchronous pitching and the synchronous rolling of the mounting vehicle body can be achieved, operation is convenient, adjusting precision is high, and the four-stand-bar synchronous hydraulic lifting mechanism has good practical application value.

The invention discloses a gate opening and closing mechanism for a manual type sawing machine skip car, and belongs to the field of machinery. The gate opening and closing mechanism comprises a support, a hopper, a gate, a connection rod, a movable block, a polished rod, a groove, sliding hooks and a handle, wherein the hopper is fixed to the support, the gate is connected with the hopper through a hinge, one end of the connection rod is hinged to the gate, the other end of the connection rod is hinged to the movable block, the movable block is fixed to the polished rod, the polished rod is assembled on the support, the groove is fixed to the support, and the sliding hooks and the handle are arranged on the polished rod. By means of the gate opening and closing mechanism, the problem that as gate opening or closing is complex when an existing sawing machine skip car loads and transports bars, the operating efficiency is low is solved. The gate opening and closing mechanism has the advantages of being simple in structure, reasonable in design and easy to manufacture.

The invention discloses a knob one-button start type electric door lock assembly. The knob one-button start type electric door lock assembly comprises an upper cover plate (6), a lower cover plate (4)and a locking tongue (9); a rotating shaft (7) is arranged between the upper cover plate and the lower cover plate; the outer end portion of the rotating shaft is connected with a knob (1); the innerend portion of the rotating shaft is connected with a rotor (11); one side of the rotating shaft is connected with the locking tongue through a slider (8); the other side of the rotating shaft is connected with a solenoid valve (16); the solenoid valve is electrically connected with an ignition control circuit board (5); the rotor is mounted in a gear seat (15); and a pill (12) and a pill spring(13) are arranged in the rotor; and the pill is adjacent to the gear slot (19) of the gear base. According to the knob one-button start type electric door lock assembly of the invention, the knob andthe rotating shaft are adopted to replace an original lock head assembly; a vehicle can be started by means of a one-button mode with no keys required. The knob one-button start type electric door lock assembly has the advantages of simple assembly structure and convenient and reliable operation. With the knob one-button start type electric door lock assembly adopted, work efficiency can be improved, and the normal driving work and vehicle performance of the vehicle are effectively guaranteed.

The invention provides a blowoff valve and a liquid chromatograph. The blowoff valve and the liquid chromatograph are used for cooperating with a conveying pump for use. The blowoff valve comprises avalve body, a valve element and a detection assembly, wherein the valve element is arranged on the valve body and can move relative to the valve body so as to adjust the working state of the valve body, the detection assembly is arranged on the valve body or the valve element, the detection assembly is used for detecting the working position of the valve element relative to the valve body, the detection assembly is used for being in communication connection with a controller, the controller is used for being in communication connection with the conveying pump, and the controller adjusts the working state of the conveying pump according to the working position. Thus, the control is convenient, fast and reliable. The liquid chromatograph comprises the blowoff valve and has all the advantagesof the blowoff valve.

The invention discloses a bar-type off-circuit tap-changer, which comprises an insulating rod and a support rack, wherein the support rack is provided with an operation positioning device; the insulating rod is provided with fixed contacts along the length direction at intervals; each phase fixed contact is provided with a moving contact assembly; the moving contact assembly comprises a moving contact bracket and a clamping piece type moving contact arranged in the moving contact bracket; the clamping piece type moving contact comprises an upper moving contact and a lower moving contact; the moving contacts are pressed through springs and are bridged between the adjacent phase fixed contacts; and the bar-type off-circuit tap-changer is characterized in that the upper spring and the lower spring in an upper contact cavity and a lower contact cavity of at least one moving contact assembly are asymmetrically arranged. The springs of two oppositely clamped moving contacts are asymmetric in position arrangement; and movement of the moving contacts is not synchronous, so that overlapping of the maximum climbing moment of the moving contacts during gear changing and shifting is prevented; the switch conversion moment is reduced; the operation is relatively portable and reliable; and the bar-type off-circuit tap-changer is more meaningful to the reliability and the convenience of a relatively high current tap-changer.