103results about How to "Meet installation needs" patented technology

A novel motor end cover comprises a rotary transformer stator mounting hole arranged in the center of the top surface of the outer side of the end cover and a bearing mounting hole arranged in the center of the inner side of the end cover, the center of the rotary transformer stator mounting hole and the center of the bearing mounting hole are located on the same axis, and a junction box cover mounting seat is arranged on the outer side of the circumference of the rotary transformer stator mounting hole. A three-phase connector is arranged on the side wall of the upper portion of the junction box cover installation base, a suspension installation base is arranged on the outer side of the lower portion of the junction box cover installation base, the junction box cover installation base is connected with the bottom of the suspension installation base through an end cover wall, and connecting ribs are arranged between the end cover wall and the lower junction box cover installation base wall and between the end cover wall and the rotary transformer stator installation hole wall. The connecting ribs protrude towards the top end of the end cover, and a weight reduction groove with an h-shaped section is formed among the connecting ribs, the wall of the end cover, the wall of the lower junction box cover mounting seat and the wall of the rotary transformer stator mounting hole.

The utility model belongs to the technical field of furnace door, concretely relates to a furnace door automatic opening and closing device and rotary lifting device, and the device includes: frame, swing arm and furnace door connecting arm connected with swing arm, lifting mechanism is set at the top of frame, among them the lifting rod in lifting mechanism is connected with swing arm to be suitable for lifting furnace door connecting arm in the lifting rod lifting process, rotary mechanism is set below frame, among them the rotation axis in rotary mechanism is with the axis of lifting rod collinear, and both are through the abutment of joint axle, and then when the rotation axis rotates, it drives the deflection of furnace door connecting arm to open the furnace door, through being provided with lifting mechanism and rotary mechanism, and make the axis of lifting rod and rotation axis in two mechanisms collinear, and then reduce the installation land space of two mechanisms, make two satisfy the control furnace door connecting arm drive furnace door lifting, rotary operation at the same time, reduce the installation land space, satisfy the installation demand of compact space.

The utility model discloses an unmanned aerial vehicle-mounted radar hanger structure with a damping function, which relates to the technical field of unmanned aerial vehicles and comprises an unmanned aerial vehicle body, a base net rack and a pull net rack. The base net rack is connected to the bottom surface of the unmanned aerial vehicle body through bolts, and the lower part of the base net rack is provided with a sunken upper mounting groove; the pull net rack is arranged below the base net rack, the edge of the pull net rack is connected with the base net rack through a plurality of elastic connecting pieces, the upper portion of the pull net rack is provided with a sunken lower installation groove, and the lower installation groove corresponds to the upper installation groove and is used for being connected with the airborne radar in a clamped mode. Through the elastic connecting pieces between the base net rack and the towing net rack and the elastic supporting pieces on the towing net rack, vibration and impact generated in the flying process of the unmanned aerial vehicle can be effectively absorbed and buffered, precise equipment such as airborne radar can be protected, the performance of the unmanned aerial vehicle is improved, and the service life of the unmanned aerial vehicle is prolonged.

The utility model relates to the technical field of automobile wire harness ribbons, and discloses a staple bolt ribbon structure for a CTC automobile wire harness, which comprises a mounting seat, a wire arranging seat and a ribbon body, a limiting groove is formed in the wire arranging seat, an adjusting assembly is arranged in the limiting groove, one end of the ribbon body is provided with the limiting assembly, and the other end of the ribbon body is provided with the adjusting assembly. And the adjusting assembly comprises a limiting rod arranged in the limiting groove, a connecting block is arranged in the limiting rod, a first toothed plate is arranged in the limiting groove, a first reserved mounting frame is arranged at the top of the first toothed plate, a penetrating groove is formed in the inner side wall of the limiting groove, and a motor is arranged on the inner bottom wall of the penetrating groove. According to the utility model, by adopting the split type fixing cable tie, the binding stability of the automobile wire harness can be improved, so that the automobile wire harness can adapt to high-temperature and high-humidity severe environments, the installation requirements of positions such as an automobile engine compartment are further met, and the applicability and the practicability of the automobile wire harness fixing cable tie are improved.

This utility model relates to the field of medical device technology, and in particular to an intraoral scanning mounting structure and an intraoral scanning device. The intraoral scanning mounting structure includes: a housing with a mounting position, on which a protrusion is provided; an electro-optical component is mounted on the mounting position, and a groove is formed on the circumferential edge of the electro-optical component for the protrusion to extend into, thereby positioning the electro-optical component; an elastic component includes a first elastic member and a second elastic member, which are independently provided. The first elastic member is clamped between the mounting position and a first wall of the electro-optical component, and the second elastic member is clamped between the mounting position and a second wall of the electro-optical component, thus satisfying the installation and fixing requirements while allowing the electro-optical component to move within the mounting position due to thermal expansion and contraction; in the circumferential direction of the electro-optical component, a groove is provided between the portion of the first wall that abuts against the first elastic member and the portion of the second wall that abuts against the second elastic member, thereby ensuring the installation accuracy requirements of the electro-optical component.

The application provides a panel bottom box assembly, comprising: a first shell, the first shell comprising a plurality of first side walls, a containing portion being formed between the plurality of first side walls; a first connecting piece being arranged on each of the first side walls, the first connecting piece being located in the containing portion, and the length of the first connecting piece being along a first direction; a second shell, the second shell comprising a plurality of step structures and a plurality of second side walls, the second side walls extending from the step structures towards the first shell, a second connecting piece being arranged on each of the second side walls, and the length of the second connecting piece being along the first direction; wherein the number of the first side walls, the second side walls and the step structures is equal, the plurality of second side walls are located in the containing portion, and the first connecting pieces and the second connecting pieces correspond to each other and are in sliding connection. The panel bottom box assembly provided by the application can adapt to different cavity sizes between a wallboard and a wall body, and can realize flush embedding of a switch panel and the wallboard.

The utility model relates to pipeline installation support technical field, and disclose a kind of pipeline installation support adjusting device for construction, including first I-steel, the side of first I-steel can be fixedly installed with multiple second I-steel, the lower part of first I-steel and second I-steel is installed with multiple mounting plate, the bottom surface of mounting plate is fixedly installed with support cylinder, adjusting threaded rod is provided in support cylinder. By mounting plate opening convex character shape through slot, it is convenient to install by passing through the lower part through slot of first, second I-steel, then its top two sides threaded hole limiting bolt flexible positioning is used, avoid later pipeline installation punching, improve the speed of pipeline installation, rotate threaded rod push plate, support frame height can be easily adjusted, support threaded rod can adjust support adjusting plate height, rotating plate can be adjusted angle by rotating shaft, satisfy different pipeline installation needs, improve installation adjustment efficiency and convenience.

The utility model provides a connection traction structure of an agricultural machine, and relates to the technical field of connection traction structures, the connection traction structure comprises a matching connection block body, a spring connecting piece is fixedly installed at the axis position of the bottom end face of an extension block body, and the bottom end of the spring connecting piece is connected with the top end face of the matching connection block body in a welded mode; through the arrangement of the two sets of limiting annular blocks, after a power connecting pipe used for power transmission between a vehicle head and a trailer is connected and installed, the power connecting pipe can be clamped into the limiting annular blocks, the power connecting pipe is limited in a certain position area, and the power connecting pipe is prevented from being pinched off and damaged during follow-up traction transportation; the problem that in the working process, due to the fact that traction vehicle frames installed on an existing vehicle head and an existing trailer cannot achieve corresponding position limiting on the power connecting pipe, the power connecting pipe is prone to being pinched off and damaged due to random shaking of the position of the power connecting pipe is solved.

This utility model relates to the field of installation brackets, and discloses an installation bracket for fire protection facility installation projects. It includes a mobile vehicle, a drive assembly fixedly connected to the top of the mobile vehicle, a sliding plate slidably connected to the top of the mobile vehicle, and an adjustment mechanism on the top of the sliding plate. The adjustment mechanism includes a screw, the bottom end of which is rotatably connected to the outer wall of the top of the sliding plate via a bearing. A first threaded sleeve is threadedly connected to the outer wall of the screw, and a lower adjusting ring is fixedly connected to the outer wall of the first threaded sleeve. The top of the lower adjusting ring contacts an upper adjusting ring. In this utility model, the sliding plate is driven to slide along a guide rail by a linear motor. Through the transmission of a worm gear, worm wheel, and screw, the height of the lower and upper adjusting rings can be adjusted to meet the installation requirements of different fire protection pipelines, ensuring the adaptability of fire protection facility installation and effectively improving installation efficiency and quality.

The utility model relates to the field of ceiling fan installation accessories, in particular to a fast-assembly mechanism applied to a ceiling fan and used for fixing an upper cup, the ceiling fan comprises a ceiling fan body, a hanging rod and the upper cup, the fast-assembly mechanism is arranged on the hanging rod and can be adjusted up and down in the length direction of the hanging rod, and the fast-assembly mechanism comprises an installation sleeve assembly and a locking assembly. And the two are connected and matched to lock the whole quick-mounting mechanism and the upper cup on the hanging rod. The upper cup is fixed to the preset position of the hanging rod through the quick mounting mechanism, the problems that in the prior art, the upper cup and the external thread column are integrally formed, molds of different types of upper cups matched with the external thread column need to be produced, and the stock burden of accessories is increased are solved, the quick mounting mechanism can be independently manufactured and then matched with the different upper cups to meet the mounting requirement, and the mounting efficiency is improved. The overall manufacturing cost of the ceiling fan is reduced, good universality is achieved, and the quick mounting mechanism further has the advantages of being convenient to mount and operate and reliable in structure.

This utility model relates to an integrated miniaturized air-cooled electronic chassis, including a chassis with a cubic structure open at both the front and rear ends. A front cover assembly and a rear cover assembly are respectively installed on the front and rear open surfaces, and electromagnetic shielding strips are provided in the installation gaps between the chassis and the front and rear cover assemblies. A circuit module is installed inside the chassis, and curved heat dissipation fins are installed on the top and bottom. An air inlet is provided at the rear corresponding to the heat dissipation fins. Air outlets are provided on the top and bottom of the front cover assembly. A fan assembly is installed on the rear cover assembly. This application utilizes the fan assembly, rear cover assembly, chassis, heat dissipation fins, and front cover assembly to form an effective air-cooled heat dissipation channel, which can quickly dissipate the heat generated by the circuit modules inside the chassis, greatly improving the chassis's heat dissipation efficiency. Simultaneously, the electromagnetic shielding strips effectively reduce electromagnetic interference, improve the stability of the electronic equipment inside the chassis, and ensure that the chassis can operate normally in complex electromagnetic environments.

The utility model provides an anti-impact electric cylinder, which belongs to the technical field of engineering machinery and comprises a lead screw pair mounted in an outer pipe, a lead screw in the lead screw pair is driven by a servo motor to rotate, the lead screw drives a nut to do reciprocating rectilinear motion along the surface of the lead screw when rotating, a connecting pipe is fixed at the upper end of the nut, and a push rod is sleeved at the upper end of the lead screw. The push rod is matched with an extension block at the upper end of the connecting pipe in a hooking and pulling mode, the surface of the connecting pipe is sleeved with a compression spring, the upper end of the compression spring makes contact with the lower end face of the push rod, and when the nut pushes the push rod to do forward linear movement through the compression spring, impact energy can be absorbed and converted into elastic potential energy; direct damage of impact to core components such as a lead screw pair and a gear pair is effectively reduced, component failure caused by impact is avoided, and the service life of the electric cylinder under the high-impact working condition is remarkably prolonged.

The invention discloses a vibration isolation and noise reduction structure for an acoustic detection array of a deepwater aircraft, the vibration isolation and noise reduction structure comprises a primary vibration isolation structure arranged between an array supporting seat and an inner cylinder, and the primary vibration isolation structure is a vibration isolation and noise reduction main body structure; the vibration isolation and noise reduction main body structure is mainly formed by alternately stacking resin plate layers and composite rubber layers, and a positioning isolation rubber mat is arranged at the bottom of the vibration isolation and noise reduction main body structure; and mass blocks which are uniformly distributed along the circumference are embedded into the composite rubber layer to form a local resonance design composite structure. According to the invention, the noise generated during the navigation of the vehicle can be isolated, so that the influence of the noise on the array is effectively reduced.

The invention relates to a pickup device. The pickup device comprises an installation base, a pickup head and an elastic assembly, the installation base is provided with a first surface and a second surface which are arranged oppositely in the first direction, the installation base is further provided with an installation hole, and the installation hole extends in the first direction and penetrates through the first surface; the pickup head comprises a body part and a mounting column which are connected, the body part is located on the side, provided with the first surface, of the mounting base, and at least part of the mounting column protrudes out of the body part and is movably arranged in the mounting hole; the elastic assembly is installed on the installation base, the elastic assembly can elastically stretch out and draw back in the second direction and can be at least partially arranged in the installation hole in a protruding mode, and when the installation column is located in the installation hole, the installation column is detachably connected with the elastic assembly; wherein the first direction intersects with the second direction. According to the pickup device, the requirements for quick disassembly and assembly of the pickup head can be met, accurate alignment of the pickup head and the mounting base can be met, and the pickup device is applied to an automatic production line and facilitates improvement of the production efficiency.

The utility model discloses a brake pad support structure which comprises a brake pad support and a brake pad installed on the brake pad support through a connecting structure, a dovetail groove is designed in the back face of the brake pad support, and the corresponding brake pad is inserted into the dovetail groove through a dovetail block to achieve installation and matching. Or, a plurality of connecting protrusions are arranged on the two sides of the front face of the brake pad support, the corresponding brake pads are connected to the connecting protrusions in a sleeved mode through guide clamping sleeves to achieve installation and matching, the brake pad support adopting the technical scheme reserves a traditional dovetail groove structure so as to be matched with rapid installation of existing dovetail type brake pads, the universal connecting protrusions are additionally arranged, and therefore the brake pad support is convenient to use. According to the brake pad support, the non-dovetail type brake pads can be rapidly installed, so that the installation universality is improved, the same brake pad support can be matched with two or more brake pads, the inventory pressure is reduced, the installation selectivity is more, and the effect that one support has multiple purposes of brake system hardware is achieved.

The utility model relates to the field of transformer, especially is a kind of transformer structure for power module, including transformer body, the both sides of transformer body are provided with installation component, the lower end of two installation components is fixedly connected with adjusting assembly, two adjusting assemblies are respectively provided with wire slot and adjusting groove, winding copper wire is provided in wire slot, two-way screw rod is rotatably connected in adjusting groove, the both sides of two-way screw rod are all screw thread connection with electric block, the lower end surface of two electric blocks is all fixedly connected with pin, the upper end surface of two electric blocks is all fixedly connected with electric column.The utility model, by setting adjusting assembly, wire slot, adjusting groove, limit board, limit slot, rectangular opening, winding copper wire, two-way screw rod, electric block, pin and electric column structure mutually cooperate, by the free adjustment of pin spacing, the installation demand of different PCB can be better satisfied.

The utility model discloses modularized road construction equipment, and relates to the technical field of road construction. The device comprises a mounting shell, a box body is slidably connected to the inner wall of the mounting shell, a drilling module is arranged on the surface of the box body, a pushing module used for pushing the box body to slide is arranged below the box body, a handle is fixedly connected to the top face of the mounting shell, and a hole depth control module and a perpendicularity control module are arranged on the surface of the mounting shell. The drilling module comprises a motor, the motor is fixedly installed on the inner wall of the box body, the output end of the motor is fixedly connected with a rotating shaft, and the rotating shaft is rotationally connected with the box body, so that the effect of freely adjusting the drilling depth of the road surface in use is achieved, and the purpose of accurately controlling the drilling depth is achieved; the installation requirement of road equipment can be better met, it can be guaranteed that a drill hole and a road surface are in a mutually perpendicular state, deflection of the drill hole is avoided, and practicability is good.

The utility model relates to a kind of double self-locking button switch, including shell, the base fixed in the lower end of shell, button and spring seat being movably matched in the upper side of shell and being movably set in shell and being connected with button, self-locking mechanism is equipped in the left and right sides of spring seat, static contact piece is fixedly connected on base, installation slot is opened in spring seat, dynamic contact piece is slidably matched in installation slot, abutting spring for holding dynamic contact piece downward is further equipped in installation slot and located above dynamic contact piece, LED circuit board is fixedly arranged on the upper side of spring seat, LED circuit board is equipped with the LED lamp bead located in the lower part of button, abutting spring is electrically connected with LED circuit board, the utility model directly utilizes abutting spring and directly electrically connected with LED circuit board, reduces the number of components, reduces manufacturing cost and structural complexity, when dynamic contact piece and static contact piece abut, circuit conduction LED lamp bead emits light, so that user can more intuitively understand the working state of button switch.

This utility model belongs to the field of end cap installation technology, and particularly relates to a hoisting tool for installing EGR cooler end caps. It includes a movable frame, a support platform on the upper rear side of the movable frame, a rotating frame with an obtuse angle design above the movable frame, a trapezoidal support frame inclined above the rotating frame, and an extension frame arranged in a triangular pattern on one side of the support frame. A first hoisting component is mounted on the support frame, and a second hoisting component is mounted on the extension frame. An adjustable hanger is located below the first and second hoisting components. This utility model has a reasonable design, simple structure, and convenient processing, enabling convenient hoisting and placement of workpieces. On the one hand, it can adapt to workpieces of different specifications and sizes, improving the practicality of the equipment; on the other hand, the position of the workpiece can be freely adjusted according to different usage requirements, ensuring smooth installation, reducing labor intensity, and guaranteeing work progress.

This utility model discloses a wear-reducing dual-shaft integrated bearing housing, including a bearing mounting chamber one, a bearing mounting chamber two located at the right end of the bearing mounting chamber one, a shock-absorbing mechanism, and an adjustment mechanism. The shock-absorbing mechanism includes a shock-absorbing plate, a sliding groove, a sliding seat, and a connecting rod. The shock-absorbing plate is slidably connected to the interior of the bearing mounting chamber one and the bearing mounting chamber two, respectively. The bottom walls of the bearing mounting chamber one and the bearing mounting chamber two are provided with symmetrically distributed sliding grooves, and sliding seats are slidably connected inside the sliding grooves. The upper end of each sliding seat is rotatably connected to a connecting rod, and the lower end of each shock-absorbing plate is fixedly connected to evenly distributed supports. This wear-reducing dual-shaft integrated bearing housing, in cooperation with a movable conical platform mechanism and a shock-absorbing damper, achieves stable bearing support while improving the shock-absorbing performance of the shock-absorbing damper. At the same time, the lateral spacing between the two bearing holes is adjusted by sliding and locking the adjusting plate.

This utility model relates to the technical field of detachable gathering and transportation manifold supports, and discloses a detachable gathering and transportation manifold support for oilfield surface construction, including a first support frame and a second support frame. A mounting base is fixedly connected to the top of the first support frame, and a damping shaft is rotatably connected within the mounting base. A first crossbeam is fixedly connected to the outer wall of the damping shaft, and a sliding groove is formed inside the first crossbeam. Limiting screw holes are evenly distributed inside the first crossbeam. A support seat is fixedly connected to the top of the second support frame, and a second crossbeam is fixedly connected to the outer wall of the damping shaft. A threaded hole is formed at one end of the second crossbeam, and the outer wall of the second crossbeam is slidably connected within the sliding groove. A limiting bolt is threadedly connected within the limiting screw hole. In this utility model, by rotating the limiting bolt, it is unscrewed from the limiting screw hole and the threaded hole. Then, the second crossbeam is removed from the sliding groove of the first crossbeam, thus achieving disassembly of the support, allowing for reuse and reducing resource waste.

This invention discloses a three-compartment multi-purpose plastic-aluminum composite radiator, relating to the field of radiator technology. In this invention, two cleaning sections are symmetrically rotated on the lower manifold pipe. The water-driven end of the cleaning section is located inside the lower manifold pipe and is driven by water flow. The heat exchange assembly consists of a heat exchange section and a flow guiding section. The cleaning section is located inside the flow guiding plastic pipe and is used to clean scale buildup inside the flow guiding plastic pipe. The heat exchange section is sleeved and installed on the flow guiding plastic pipe, and conducts heat through contact with the radiator assembly, transferring heat from the flow guiding plastic pipe to the radiator assembly. Adjacent lower manifold pipes and adjacent upper manifold pipes are interconnected. This invention utilizes the impact of flowing hot water on the water-driven impeller to cause it to rotate, driving the cleaning component to rotate along the inner wall of the flow guiding plastic pipe, thus scraping the inner wall of the flow guiding plastic pipe. The scraped-off scale is discharged from the flow guiding plastic pipe with the hot water flow, effectively reducing the amount of scale buildup on the inner wall of the flow guiding plastic pipe on the radiator after long-term use.

The utility model provides a kind of photovoltaic panel clamp, it is related to photovoltaic panel technical field, including first fixed link, the front end of first fixed link is equipped with second fixed link, the rear end of second fixed link is equipped with mounting bracket, the inside of second fixed link is provided with clamping mechanism, the inside of clamping mechanism is equipped with photovoltaic panel main body;By being equipped with clamping mechanism, the height and length of adjustable clamping block can be adjusted by the mutual cooperation between clamping mechanism, can be flexibly adapted to the thickness and frame size of different models photovoltaic panel main body, without replacing whole clamp due to photovoltaic panel main body model replacement, substantially reduce equipment cost and construction period, simultaneously, the height and length of clamping block can be adjusted, accurately calibrate the position of photovoltaic panel on bracket, avoid the problem of uneven gap between adjacent panels caused by installation deviation, ensure photovoltaic array layout neat.

This utility model discloses an indoor riser tee installation corrector, including a corrector rod. One end of the corrector rod is provided with an auxiliary component, and an adjustment component is connected to the auxiliary cylinder. The auxiliary component on the corrector rod can provide auxiliary restraint during the installation of the auxiliary cylinder, reducing the possibility of displacement of the auxiliary cylinder during the correction process and improving the correction accuracy. At the same time, the adjustment component on the auxiliary component can adjust the size of the adjusting rod according to the usage of the indoor riser tee, meeting the high-precision and multi-scenario installation requirements of the indoor riser tee installation corrector. The mounting seat and spirit level on the corrector rod help improve the levelness of the corrector rod during use, which in turn improves the accuracy of the indoor riser tee installation corrector.

The utility model relates to electronic device technical field especially, is more particularly to a kind of multifunctional mounting seat and the power supply with the mounting seat, the mounting seat includes the assembly part for installing power supply and the installation part for fixing mounting of mounting seat, mounting seat is extended and is provided with the connecting portion higher than the top of power supply, connecting portion is set with the mounting hole for hanging or threading fixed part, installation part is also provided with slide rail installation component, and slide rail installation component includes detachably connected slide rail and sliding slot, and sliding slot is arranged on installation part, and mounting seat can slide rail move, through the fastener after being set through limiting through-hole, mounting seat can be installed on plane, satisfy plane installation, also provided with the hanging hole for hanging simultaneously, so that mounting seat can also adopt wall-mounted installation, also set up slide rail installation component, so that mounting seat can also satisfy guide rail type installation, can satisfy the installation demand of power supply diversification.

The utility model relates to the technical field of building curtain walls, in particular to a three-dimensional adjustable unit curtain wall connecting device, which solves the problems of limited adjusting direction and insufficient adjusting precision of a curtain wall connecting device in the prior art, and comprises a mounting seat connected with a main body structure and a hanging weight connected with a curtain wall, the hanging weight is connected with the connecting base in a hanging mode, a Y-direction adjusting mechanism is arranged between the mounting base and the connecting base, and a Z-direction adjusting mechanism and an X-direction adjusting mechanism are arranged between the connecting base and the hanging weight. The curtain wall adjusting device has the advantages that the Y-direction adjusting mechanism, the Z-direction adjusting mechanism and the X-direction adjusting mechanism are arranged between the main body structure and the curtain wall, accurate adjustment of the curtain wall in the X direction, the Y direction and the Z direction is achieved through the Y-direction adjusting mechanism, the Z-direction adjusting mechanism and the X-direction adjusting mechanism, and the installation requirements of complex building facades are met.

The utility model relates to printing auxiliary equipment technical field, concretely discloses a kind of buffer paper storage frame of rotary inkjet printing machine, including storage rack, support plate, adjusting structure, rotating rod and fixed structure, storage rack both sides are respectively provided with support plate, installation groove is opened in the side of support plate close to storage rack, adjusting structure is set in the inside of support plate one side installation groove, rotating rod is set in the inside of storage rack, sliding slot is opened in the outer surface of rotating rod, fixed structure is set in the inside of the outer surface sliding slot of rotating rod, fixed ring is respectively set in the outer surface of the both ends of rotating rod, fixed ring is slidably connected in the outer surface of rotating rod, rotating rod outer side is provided with paper storage cylinder, by being provided with support plate and adjusting structure, the rotation of threaded rod is converted into the linear motion of lifting plate, drives the overall descent of storage rack, makes the paper storage cylinder to be replaced contact ground, it is convenient for operator to take down empty paper roll and install new paper roll, avoid manual to paper roll and lift, improve work efficiency.