91results about How to "Save internal space" patented technology

The utility model discloses an oil-gas separation mechanism and an engine, the oil-gas separation mechanism comprises an air inlet cam shaft, a chain wheel, a centrifugal separation disc and a breather pipe, and the air inlet cam shaft is provided with a first channel penetrating through the two ends of the air inlet cam shaft; the chain wheel is meshed with a timing chain of an engine and used for driving the air inlet cam shaft to rotate. The centrifugal separation disc is connected with one end of the air inlet cam shaft and provided with a separation cavity, the separation cavity communicates with the first channel, fan blades are arranged in the separation cavity, the centrifugal separation disc rotates to suck mixed oil gas into the separation cavity, and the fan blades guide gas into the first channel and throw engine oil out of the separation cavity. The breather pipe communicates with the end, away from the centrifugal separation disc, of the first channel and is used for exhausting gas in the first channel. According to the oil-gas separation mechanism, the oil-gas separation structure can be arranged on the air inlet cam shaft, the space occupied by the oil-gas separation structure in an engine is reduced, the internal structure of the engine is simplified, and the manufacturing difficulty and manufacturing cost of the engine are reduced.

The utility model discloses a wheat and corn triangular final singling interplanting close planting planter, which comprises a traction frame, a land wheel and seeding monomers, the seeding monomers perform small double-row triangular final singling mode seeding during seeding, at least two seeding monomers are arranged on the traction frame side by side through a four-bar linkage, the land wheel is connected with the traction frame through a connecting frame, and the land wheel is connected with the traction frame through a connecting frame. The land wheel is linked with a transmission through a transmission mechanism, the transmission drives the seeding monomers to synchronously rotate through a driving mechanism to realize seeding operation, and the distance between the seeding monomers is matched with a corn interplanting area reserved during wheat planting and seeding; the sowing machine is improved on the basis of an existing sowing machine, a small double-row triangular final singling sowing mode is adopted for corn sowing in a corn interplanting area reserved during wheat sowing, the wheat and corn interplanting mode is optimized, the corn sowing density is increased, the interplanting land utilization rate is increased, and the yield is increased.

This utility model belongs to the field of fuel cell accessories and discloses a quick-connect fuel cell power distribution box. The power distribution box consists of a top cover and a base; the base has a support surface for placing power distribution and control components, and a fixing pad is connected to the bottom of the base; a sealing ring is provided at the top edge of the base; the top cover is placed on the base. This utility model fuel cell power distribution box has low cost, small size, low failure rate, and high waterproof rating. The internal structure of this power distribution box fixes relays, fuses, and wiring harness terminals without the need for connectors, which effectively saves costs. Since there are no control chips and circuit boards inside, internal space is saved and the failure rate is reduced. This power distribution box has added waterproof plugs and sealing plugs, and the waterproof rating reaches IP67.

A circuit breaker includes at least two parallel circuit breaker poles, each circuit breaker pole including a housing. The housings of all circuit breaker poles are assembled to form an outer casing. Each housing contains an operating mechanism and a contact system. The operating mechanism includes a lever, and the contact system includes a cooperating moving contact assembly and two stationary contacts. The lever and the moving contact assembly are rotatably mounted between a pair of mounting sidewalls of the housing. The circuit breaker also includes at least one linkage member, whose two ends are respectively linked to the lever and the moving contact assembly. When the operating mechanism is driven, the linkage member moves along a plane parallel to the mounting sidewalls on the outer surface of the mounting sidewalls. This invention simplifies the structure of the operating mechanism. Furthermore, each circuit breaker pole has a housing, and the linkage member between the lever and the moving contact assembly is located outside the housing, facilitating modular assembly. The linkage member's range of motion is located on the outer surface of the housing, which helps reduce the overall size.

This invention discloses a beam expander lens for laser scanning projection, relating to the field of laser projection display technology. It includes a first lens group, a second lens group, a third lens group, and a fourth lens group, arranged sequentially along the optical axis. These four lens groups together form the complete lens. The first, second, third, and fourth lens groups are arranged in a positive-negative-negative-negative optical power configuration. Through innovative optical architecture and optical power allocation, a large-angle beam expander function is achieved within a space of less than 35mm in total length, greatly saving internal space. By utilizing the chromatic aberration correction capability of the first lens group and the aberration correction capabilities of the second, third, and fourth lens groups, high-contrast imaging is achieved across the entire field of view and wavelength range, with concentrated dot matrix energy, meeting the requirements of high-resolution projection.

The invention relates to an integrated braking force sensor, which comprises a pressure sensing terminal, the pressure sensing terminal is of a spoke-like structure and comprises a terminal body, a mounting groove arranged in the terminal body, and a plurality of first bulges and avoiding notches arranged on the periphery of the terminal body, positioning holes are formed in the first bulges, and the positioning holes are communicated with the mounting groove; stress isolation grooves used for isolating stress are arranged between the plurality of first protrusions and the terminal body. The sensitive element is arranged on the pressure sensing terminal; the pressure sensing terminal is used for sensing an external pressure load signal and transmitting the external pressure load signal to the sensitive element; the sensitive element is used for converting the received pressure load signal into an electric signal and outputting the electric signal; and the printed circuit board is mounted in the mounting groove, is connected with the sensitive element and is used for processing the electric signal output by the sensitive element to obtain an output signal. The force sensor is easy to process, the production and manufacturing cost is reduced, the pressure sensing terminal adopting the spoke-imitating structure is excellent in performance and can be integrated on the calipers to serve as a structural part, and the internal space of the calipers is greatly saved.

This application relates to the field of battery technology, and more particularly to a battery management component and battery pack. The battery management component includes a battery management module, which comprises: a BDU component, the BDU component including a housing and a relay module, the relay module being located within the housing; and a BMS slave board assembly, located above the BDU component along the height direction of the battery pack. The BMS slave board assembly includes a BMS cover and a slave circuit board, the BMS cover being disposed on the housing, and a cavity being formed between the BMS cover and the housing, with the slave circuit board located within the cavity. This application is beneficial for improving the energy density of the battery pack.

The utility model provides a camera, comprising a housing defining an accommodating cavity; the first support is arranged in the containing cavity and connected with the shell, the first support is provided with a supporting face, and the supporting face makes contact with the inner wall of the shell; the second support is arranged in the containing cavity and connected with the first support, a plurality of circuit boards are arranged on the second support, and heat conduction pieces are arranged between at least part of the circuit boards and the first support or the shell. The heat conduction part is arranged between the circuit board and the first support or the shell, heat generated in the operation process of the circuit board can be transmitted to the first support and the shell, and the first support and the shell serve as heat dissipation parts to conduct heat dissipation on the corresponding circuit board. Therefore, not only is an additional radiator saved, but also the heat dissipation efficiency is improved, the internal space of the whole machine is saved, the assembly process is simplified, and miniaturization of the camera is facilitated.

This invention provides a flue gas nitrogen oxide reduction catalyst and its preparation and processing methods, relating to the field of industrial catalysis technology. The flue gas nitrogen oxide reduction catalyst has two functional zones, A and B, arranged sequentially along the flue gas flow direction. Functional zone A is a porous structure located at the inlet end for intercepting dust in the flue gas; functional zone B is located downstream of functional zone A and is the main reaction zone for the catalytic reduction of nitrogen oxides. The flue gas nitrogen oxide reduction catalyst provided by this invention protects the catalytic activity of functional zone B by intercepting dust in functional zone A. This partitioned design synergistically solves the problems of clogging and poisoning, significantly extending the catalyst's lifespan.

The application provides a rotating shaft device, which comprises a positioning seat and a rotating assembly. The rotating assembly comprises a first rotating mechanism and a second rotating mechanism. The first rotating mechanism and the second rotating mechanism each comprise a rotating piece and a driven piece. The rotating pieces of the two rotating mechanisms are rotatably connected with the positioning part respectively. The driven pieces of the two rotating mechanisms are rotatably connected with the positioning seat respectively. The driven piece and the rotating piece of the first rotating mechanism are slidably connected. The driven piece and the rotating piece of the second rotating mechanism are slidably connected. The linkage mechanism comprises a linkage piece arranged between the driven piece of the first rotating mechanism and the driven piece of the second rotating mechanism. The linkage piece is slidably connected with the driven piece of the first rotating mechanism and the driven piece of the second rotating mechanism through the cooperation of the eccentric shaft and the linkage groove. The application also relates to a folding shell and electronic equipment provided with the rotating shaft device.

This invention discloses a composite anti-rotational offset method for a wireless power transmission system for underwater vehicles, including an anti-rotational offset coupling mechanism and an anti-rotational offset power stabilization control strategy. The anti-rotational offset coupling mechanism includes two transmitting coil groups and one receiving coil group. The receiving coil group has a ring structure, consisting of six segmented coils connected in series, with adjacent coils having opposite winding directions. The first and second transmitting coil groups each consist of two coils connected in series, with the two transmitting coils in the same group having the same winding direction. The anti-rotational offset power stabilization control strategy achieves stable output power control by real-time acquisition of output power, calculation of the output power change rate, and adjustment of the phase angles of the two inverters. The first inverter drives the first transmitting coil group, and the second inverter drives the second transmitting coil group. This invention improves the system's rotational offset tolerance and achieves stable output power transmission under different rotational offset angles.

The invention provides a power distribution box, and relates to the technical field of electrical equipment, the power distribution box comprises a box body and a wire arrangement structure, a stand column is arranged in the box body, a back plate is arranged on the stand column, the wire arrangement structure comprises a fixed groove plate and a movable groove plate, and the movable groove plate is movably arranged in a wiring groove of the fixed groove plate. The movable groove plate can move up and down relative to the fixed groove plate and move in the height direction of a second side plate of the fixed groove plate, first side plates on the two sides of the movable groove plate are rotatably and elastically connected to a first bottom plate of the movable groove plate, and the opposite sides of the two first side plates are each provided with at least one pair of elastic wire clamp sets. The elastic wire clamp group comprises a fixed elastic clamping ring and a movable elastic clamping ring which are arranged in a staggered mode in the vertical direction, and the movable elastic clamping ring is elastically connected with the first side plate. According to the wire arrangement structure, the wire harness can be kept tightened and regular when the distribution box is in a normal operation state, and the wire harness constraint can be released during maintenance or transformation, so that the overall maintainability and operation reliability of the distribution box are improved.

The application discloses a floating oscillating water column type wave power generation device, which comprises a runner chamber I and a protective cap, a nozzle is arranged in the runner chamber I, a flow guide cone is arranged below the nozzle and has the same central axis with the nozzle, the flow guide cone is conical and has a downward pointed end, an impeller is arranged above the nozzle and has the same central axis with the nozzle, a generator is arranged above the impeller and has the same central axis with the impeller, the protective cap is arranged on the top of the runner chamber I, and gaps for air circulation are arranged at the edges of the runner chamber I and the protective cap. The nozzle with the flow guide cone structure is adopted in the application, the flow guide cone can guide the flowing direction of air flow, accelerate the flowing speed of the air flow in the device, and slow down the wave upwelling phenomenon in the runner chamber, thereby protecting the internal components of the device. The protective cap can effectively protect the generator and the controller in the device from the erosion of rainwater and sea air, thereby prolonging the service life of the device.

The utility model relates to the technical field of placing boxes, in particular to a box-shaped object convenient for replacing a nameplate, which comprises a box body and a nameplate, the box body comprises a placing box, the surface of the placing box is movably connected with a box cover, and the outer surface of the placing box is movably connected with a connecting buckle plate; the replacing mechanism comprises a nameplate placing piece, the nameplate placing piece is inserted into the outer side of the placing box, and a connecting groove is formed in the outer surface of the placing box; the fixing mechanism comprises an adjusting rod, the adjusting rod is movably connected to the surface of the box cover, one end of the adjusting rod is fixedly connected with a handle, and the other end of the adjusting rod is movably connected with a pressing plate. The types of tools in the placing box can be intuitively known through the use of the nameplate placing piece, and the problem that the nameplate placing piece is inconvenient to replace is solved through the insertion connection of the nameplate placing piece and the connecting groove.

The utility model discloses an electronic lock which comprises a first shell and a second shell, a lock hole is formed in the first shell, a lock rod of the electronic lock extends out of the first shell through the lock hole, the electronic lock further comprises an electric circuit used for transmitting switching signals of the electronic lock, and the electric circuit is used for transmitting the switching signals of the electronic lock. The electric loop comprises a pair of lock hole terminals arranged on the lock hole, an electric connecting piece is arranged on the lock rod, when the lock rod is in a locking position, the electric connecting piece is in contact with the lock hole terminals on the lock hole so as to conduct the electric loop and transmit the switching signal, and when the lock rod is in an unlocking position, the electric connecting piece is in contact with the lock hole terminals on the lock hole so as to transmit the switching signal. And the electric connecting piece is far away from the lock hole terminal on the lock hole, so that the electric loop is disconnected. According to the electronic lock, the internal space of the electronic lock can be saved, the size of the lock body is made to be small, parts are more convenient to assemble, outsourcing parts are not needed, and cost is saved.

The utility model provides a small visual holder system, which belongs to the technical field of visual holders and is provided with a base and a shell, and the shell covers the base and is connected with a visual camera groove; an elliptical groove is formed in the shell; a supporting plate is arranged at one end of the base, a holder support is hinged to the supporting plate, a visual camera is arranged at the other end of the holder support, and the visual camera extends out of the oval groove; one end of the base is provided with a motor, the output end of the motor is connected to the connecting rod mechanism, and the other end of the connecting rod mechanism is connected to the pan-tilt support. According to the small visual pan-tilt system, the angle of the camera can be effectively adjusted, the equipment structure is compact, the internal space of the shell is remarkably saved, and the overall size of the system is smaller; the device is especially suitable for small visual camera equipment, and is simple in structure, convenient to maintain and low in manufacturing and using cost.

The application discloses a garbage classification device with a fast classification switch door and a use method thereof, and designs a four-part turnover disc.The turnover disc comprises two material receiving hopper structures and two shielding parts which are arranged at intervals.The material receiving hopper structure is used for receiving garbage and pouring the garbage into a corresponding garbage can through rotation, and the shielding part shields the garbage feeding opening while the material receiving hopper structure pours the garbage.The material receiving hopper structure and the shielding part share a disc shaft and a driving structure, and the interior space of the garbage can main body is well saved.The garbage classification device of the application not only has a camera which can collect the image of the garbage, but also has a weighter.The multi-dimensional garbage information collection and the use of the information to judge the garbage type can effectively improve the accuracy of the garbage type judgment compared with the image judgment of the garbage type.

The utility model relates to smoke detection technical field, concretely is a kind of external hanging type composite fire detector, including shell;Shell inside is equipped with smoke detection mechanism, and smoke detection mechanism includes slow flow cavity, slow flow cavity is set in shell inside one end, two gas inlets are set in slow flow cavity side, and combustible gas sensor is fixedly connected in slow flow cavity inside, slow flow cavity side is communicated with air cavity, and air cavity side is communicated with detection cavity, and smoke detection assembly is fixedly connected in detection cavity inside. The aspirating smoke detector for detecting fire that is set can detect smaller smoke particles and combustible gas that early-stage technology cannot see, these particles are produced in the earliest stage of this fire of excessive heating and open fire or smoldering, can discover the existence of fire within hours before visible smoke even earlier, the very high sensitivity makes the aspirating smoke detector for detecting fire can send out alarm in time in the early stage of fire development, effectively prevent the spread and expansion of fire.

The invention discloses a method for detaching a sock subjected to end sewing in a hosiery machine, which comprises the following steps: in the end sewing process, a sock receiving tube is firstly supported by a lower component, then moves to the upper part and is supported by an upper component to complete end sewing; a sock jacking pipe is arranged on the upper portion of the pushing and lifting pipe, the outer diameter of the sock jacking pipe is smaller than the inner diameter of the sock receiving pipe, and when the sock receiving pipe is located on the lower assembly and combined with the pushing and lifting pipe, the sock jacking pipe extends into the sock receiving pipe; after sewing and weaving are completed, when the sock receiving pipe is still supported by the upper assembly, the pushing and lifting pipe pushes the sock jacking pipe to move upwards again till the sock jacking pipe extends into the sock receiving pipe, and the socks wrapping the outer wall of the sock receiving pipe are jacked into the sock receiving pipe from the lower end. The action of the sock jacking pipe is added, and it can be further guaranteed that the socks with the ends sewn can be smoothly detached.

The utility model relates to the technical field of batteries, in particular to a collector plate, a cover plate assembly and a cylindrical battery. The collector plate comprises a plate body and a connecting part, a connecting groove is formed in the plate body, one end of the connecting part is connected into the connecting groove, the connecting part has a first bending state and a second bending state relative to the plate body, when the connecting part is in the first bending state, the connecting part is separated from the connecting groove, and when the connecting part is in the second bending state, the connecting part is separated from the connecting groove. And when the connecting part is in the second bending state, the connecting part can be completely accommodated in the connecting groove. And the connecting part is configured to be capable of being bent towards the direction close to the tray body, so that the connecting part is converted from the first bent state to the second bent state. The cover plate assembly comprises the flow collecting disc. The cylindrical battery comprises the cover plate assembly. The current collecting disc and the cover plate assembly are light and thin in structure, and the cylindrical battery has higher battery capacity.

The utility model provides a container bottle, which relates to the technical field of cosmetic containers, and is characterized in that a storage bottle and an outer bottle are arranged on a middle ring connecting component, materials are stored in the storage bottle, a discharge pump component is arranged on the middle ring connecting component, the materials in the storage bottle are extracted through a lower suction pipe of the discharge pump component, and the materials are extracted along with the extraction of the lower suction pipe. The storage bottle is longitudinally and regularly folded, and the internal space of the storage bottle is reduced, so that the storage bottle can pump out materials in the storage bottle more easily, meanwhile, the interior of the bottle body is kept clean and tidy, and the problems that in a traditional cosmetic container in the prior art, along with gradual reduction of the materials, the materials in the bottle are not prone to being pumped out, and the cosmetic container is inconvenient to use are solved. According to a common piston type cosmetic container, in the process that a pump head pumps out the material, due to mechanical friction between a piston and the inner wall, once the piston is insufficient in sealing, part of the material seeps to the bottom in a bottle from the bottom of the piston, and the material cannot be continuously used.

The application provides a rotating shaft device, which comprises a supporting mechanism, a rotating assembly and a driven mechanism, the supporting mechanism comprises two side supports; the rotating assembly comprises a positioning seat and rotating mechanisms arranged on opposite sides of the positioning seat, the rotating mechanisms comprise a first rotating piece, a second rotating piece and a connecting piece, one end of the first rotating piece is rotatably connected to the positioning seat, the opposite end of the first rotating piece is rotatably connected to the connecting piece, one end of the second rotating piece is rotatably connected to the positioning seat, the opposite end of the second rotating piece is rotatably connected to the connecting piece, a first rotating axis line between the first rotating piece and the connecting piece is parallel to a second rotating axis line between the second rotating piece and the connecting piece; the driven mechanism comprises a driven piece connected to the side supports, the driven piece is slidably and rotatably connected to the positioning seat. The application also provides a folding shell provided with the rotating shaft device and an electronic device.

The embodiment of the application provides a battery pack and an electric device, which comprise a box body, a plurality of single batteries and a plurality of shielding assemblies; the box body is provided with a plurality of mutually independent containing cavities, the box body comprises a bottom plate and a side plate extending along the circumference of the bottom plate, at least one of the bottom plate and the side plate is provided with a plurality of first through holes, and at least one first through hole is communicated with one containing cavity; at least one single battery is arranged in one containing cavity, the single battery is provided with an explosion-proof valve, the explosion-proof valve is arranged opposite to the first through hole; one shielding assembly is used for covering and sealing one first through hole and is movably connected with the box body, and the shielding assembly is configured to be capable of moving relative to the box body in a direction away from the containing cavity in the case that the explosion-proof valve is actuated, so that the discharge in the containing cavity is discharged. By arranging the shielding assembly, the discharge in the containing cavity can be discharged in time when the explosion-proof valve is actuated, heat loss of other battery units which do not occur heat loss is avoided, and the use safety of the battery pack is improved.

The utility model relates to the technical field of battery devices, and provides an electric control device, a battery device and an electric device, and the electric control device comprises a shell, a wire harness structure, an electric part and a battery management main control board. The shell is provided with an accommodating space; the electrical part is arranged in the accommodating space, and a bar piece is arranged on the electrical part; one end of the wire harness structure is connected to the bar piece, and the other end of the wire harness structure is connected with the battery management main control board; wherein at least part of the wire harness structure is connected to the inner wall of the shell in a bonding mode, the wire harness structure is connected with the inner wall of the shell in a bonding mode, so that the connection stability of the wire harness structure in the shell is improved, and at least part of the wire harness structure is tightly attached to the inner wall of the shell; and the internal space of the shell occupied by the wire harness structure can be further reduced, so that the overall size of the shell can be designed to be more compact, and finally, the grouping efficiency of the whole battery device pack is improved and the design difficulty is reduced.

The utility model discloses an energy storage device and an energy storage system, the energy storage device comprises an outer box body, a heat insulation layer and a flame retardant structure, and an accommodating space for accommodating a battery device is arranged in the outer box body; the heat insulation layer is made of heat insulation materials; the heat insulation layer is arranged on the wall of the outer box body and located on the side, facing the containing space, of the wall and / or arranged between at least two walls of the outer box body, and the wall supports the heat insulation layer; the flame-retardant structure is located in the heat insulation layer and / or located on the side, facing the containing space, of the heat insulation layer. According to the energy storage device provided by the embodiment of the utility model, the thermal insulation layer and the flame-retardant structure are arranged to slow down the heat transfer speed, and when the thermal runaway of the energy storage device occurs, the time for transferring the temperature to the adjacent energy storage device is prolonged; the heat insulation layer is supported by the wall, a supporting structure of the heat insulation layer does not need to be arranged, the internal space of the energy storage device is saved, and the cost of the supporting structure is reduced.

The utility model relates to tail gas purification technical field, and disclose a kind of quick dismounting environmental protection long-acting automobile tail gas purifier, including import shell and export shell, the top of the import shell is fixedly connected with export shell, the front top of the import shell is fixedly connected with fixed component, the import shell includes import casing, accommodating groove is opened in the inside of the import casing, the side of the import casing is fixedly connected with mounting bracket, the front top of the import casing is fixedly connected with first limit ring, the top middle part of the first limit ring is opened with lower connecting groove, the front middle part of the first limit ring is opened with lower placing groove;The utility model is fixed groove by the cooperation of first limit ring and second limit ring, fixed by the cooperation of fastening ring and fixed groove, it is favorable to quick fixing and dismounting import shell and export shell, so that the installation and dismounting of tail gas purifier become simple and fast.

The application relates to a mobile phone outer folding screen rotating shaft which is provided with a connecting base, connecting plates arranged on the two sides of the connecting base, rotating assemblies arranged on the connecting base, rotating connection of the connecting plates on the connecting base, the rotating assembly comprising a limiting plate, a positioning shaft, a rotating plate, a sliding plate and a reset spring, rotating connection of each rotating plate on the corresponding positioning shaft, parallel arrangement of the sliding direction of each sliding plate with the axis of the positioning shaft, the first tooth part on the surface of each sliding plate away from the reset spring and circumferentially distributed on the sliding plate along the axis of the corresponding positioning shaft, the second tooth part on the rotating plate corresponding to each first tooth part and capable of being connected with the first tooth part, rotating connection of each connecting plate on the connecting base through the rotating plate and the positioning shaft, and self-locking of each sliding plate through the continuous force of the reset spring and the cooperation of each first tooth part and the corresponding second tooth part. The application is convenient, practical and has a clever structure.

A refrigerating chamber is formed in a refrigerator container, a drawer frame body is arranged in the refrigerating chamber, a drawer cavity with an opening in the front side is formed in the drawer frame body, a first connector is arranged on the wall of the drawer frame body, a vacuum drawer is arranged in the drawer cavity, and a pressure detection device is detachably arranged on the wall of the drawer frame body. The pressure detection device is connected with the first interface through a first pipeline, the pressure detection device is configured to detect the pressure in the drawer cavity, the pressure detection device feeds back a signal when detecting that the pressure in the drawer cavity is 0.7-0.92 atm, and the pressure detection device is a diaphragm mechanical pressure switch. The scheme can improve the pressure detection reliability of the vacuum drawer and improve the production efficiency.

The technical scheme belongs to the technical field of concealed sewing machines, and particularly relates to a concealed sewing machine, which comprises a rack, a needle plate, a sewing machine, a sewing mechanism and a sewing mechanism, the thread trimming device comprises a scissor blade, the scissor blade is movably arranged above the needle plate, and the thread trimming device is used for receiving an external signal and controlling the scissor blade to perform thread trimming work; the presser foot lifting device comprises a presser foot assembly, the presser foot assembly is movably arranged below the needle plate, and the presser foot assembly can move close to the needle plate and is matched with the needle plate to clamp cloth; the presser foot lifting device comprises a presser foot lifting driving mechanism which comprises a presser foot lifting driving air cylinder and a presser foot lifting driving shaft, and the presser foot lifting driving air cylinder is used for driving the presser foot lifting driving shaft to rotate; the presser foot lifting transmission mechanism comprises a presser foot lifting rotating shaft and a presser foot lifting connecting rod group, and the presser foot lifting connecting rod group is used for receiving the rotating power of the presser foot lifting driving shaft and inputting the power to the presser foot lifting rotating shaft to enable the presser foot lifting rotating shaft to rotate; and the presser foot assembly is arranged at the rear end of the presser foot lifting rotating shaft.

The utility model discloses a kind of buckle structures for musical instrument harness, it is related to harness accessory technical field, including buckle body and lock catch, the middle part position of the buckle body is equipped with locking buckle hole, one end of the buckle body along X axis direction is equipped with lock catch connecting part, the other end of the buckle body along X axis direction is equipped with locking part, the locking buckle hole is located between lock catch connecting part and locking part, one end of the lock catch along X axis direction is rotatably connected with lock catch connecting part through pivot, the other end of the lock catch along X axis direction is buckled with locking part, the middle part position of the lock catch is equipped with limit buckle part, the limit buckle part can be inserted into locking buckle hole.The utility model's lock catch is rotatably buckled and installed on the buckle body, can realize single-hand opening and closing and lock catch, with the advantages of saving space, good stability, long service life cycle, flexible and convenient to use and strong practicality.