150results about How to "Large installation space" patented technology

The present invention discloses a mechanical tensioning gravity energy storage power generation device based on a rail train and a power generation track line thereof, including a power station under the track, two rows of drive plates are arranged at the bottom of the train, the power station includes a box buried under the track, a power generation assembly is arranged in the box, the power generation assembly is arranged in the middle of the track, and the power generation assembly is connected to a tensioning rope assembly, the tensioning rope assembly includes a tensioning steel wire rope, one end of the tensioning steel wire rope is connected to the power generation assembly and arranged in the box, and the other end is connected to a mechanical tensioning adjustment assembly, the mechanical tensioning adjustment assembly is arranged outside the track, and the mechanical tensioning adjustment assembly drives the power generation assembly by adjusting the tensioning force of the tensioning steel wire rope, and is pressed toward the drive plate on the train. The present invention adopts a mechanical tensioning rope design to realize the pressing of the power generation assembly and the train drive plate, avoids the power station pressing being affected by the ambient temperature, improves the applicability of the power station, and is also more convenient for maintenance and adjustment.

The invention provides a connecting piece and a battery. The connecting piece is used for connecting a pole and a tab of the battery and comprises a pole connecting part, a tab connecting part and a fusing part, and the fusing part is connected with the pole connecting part and the tab connecting part and protrudes in the direction away from the pole; the fusing part is provided with a first surface and a second surface which are arranged away from each other, the first surface is located on one side, close to the pole, of the fusing part, and the first surface and the second surface are covered with insulating glue layers. The fusing structure in the connecting sheet provided by the invention can be rapidly fused when the pole group is short-circuited, and the risk of re-connection of the tabs and the connecting sheet is not caused; meanwhile, the boss type fusing structure can meet the design requirements that the overall structure of the connecting piece is simple and flat on the basis that the boss type fusing structure does not make contact with the pole column, the installation space of the pole lug is enlarged, and therefore the over-current capacity of the pole group is improved, and safe use of the pole group is guaranteed.

The invention relates to a cutter running-in machine of a shield tunneling machine, which belongs to the technical field of shield tunneling machines and comprises a base, a mounting seat, a cutter running-in testing device and a cutter mounting device, a fixed mounting frame is arranged at the top of the mounting seat; the cutter running-in testing device comprises a driving part arranged on the fixed mounting frame and an executing mechanism connected with the driving part, and the driving part can drive the executing mechanism to drive the cutter ring to rotate; the tool mounting device comprises a directional moving assembly arranged at the top of the base, a tool assembling seat is arranged at the top of the directional moving assembly, the directional moving assembly can drive the tool assembling seat to perform directional displacement, and the tool running-in testing device is matched with an executing mechanism through a driving part arranged on a fixed mounting frame. The cutter ring can be stably and efficiently driven to rotate, so that the running-in test of the cutter is realized, and the non-uniformity and instability in the traditional running-in detection are avoided.

A humanoid robot finger transmission system belongs to the technical field of manipulators and comprises a palm part and finger parts, each finger part is provided with a transmission system, each transmission system comprises a driving mechanism and a connecting rod mechanism, and each driving mechanism is a miniature double-buckle pushing chain device arranged on the side, close to the palm back, of the palm part. A first installation space is formed in the palm part, close to one side of the palm center, of the driving mechanism, the connecting rod mechanism comprises a first connecting rod connected between the middle knuckles and the far-end knuckles and a second connecting rod connected between the near-end knuckles and the middle knuckles, and a driving rod assembly is connected between the second connecting rod and the output end of the miniature double-buckle pushing chain device. And a second mounting space is formed in the finger part on the outer sides of the connecting rod I and the connecting rod II. The miniature double-buckle pushing chain device is used as a driving mechanism of each finger part, so that the cost is reduced, the internal mounting space of the manipulator can be greatly expanded, and the manipulator can realize function upgrading by mounting more sensor parts.

The utility model belongs to the technical field of pumps, particularly relates to a pump body mounting structure for a chemical centrifugal pump, and aims to solve the problems that in the prior art, a bottom plate can be fixed on a mounting plate by clamping a clamping rod into a connecting block, but in the mounting process, as the connecting block is rectangular, the connecting block is inconvenient to position in the inserting process of the connecting block and the bottom plate, and the mounting efficiency is high. In order to solve the problems that in the prior art, due to the fact that a transmission plate is located in a connecting plate, the connecting plate needs to be specially manufactured, and the installation cost is increased, the following scheme is provided, the centrifugal pump comprises a centrifugal pump body, a base and an installation plate, and the base is fixedly arranged at the bottom of the centrifugal pump body and arranged at the top of the installation plate; according to the utility model, the base can be fixed on the mounting plate through the cooperative use of the clamping plate and the mounting plate, the fixing strip can be fixed on the mounting plate while the base is fixed, and positioning is convenient in the mounting process, so that the mounting efficiency can be improved, a special part is not needed, and the mounting cost is reduced.

The utility model relates to a volute installation assembly, a fan system and a range hood, the volute installation assembly comprises a support used for being respectively connected with a volute and an external installation foundation, and the volute installation assembly is characterized in that at least part of the support is located on the outer side of the volute; and a first mounting hole for connecting the bracket with an external mounting foundation is formed in the position, exposed out of the outer side of the volute, of the bracket. The volute installation assembly has the advantages that a larger installation space can be formed between the volute installation assembly and an external installation foundation, interference between a fastener and a volute can be avoided, the height of the volute installation assembly is not limited by the length of the fastener any more, and a thinner volute installation assembly can be designed.

The utility model discloses a computer power supply fixing mechanism, and relates to the field of computer power supplies. The computer power supply fixing mechanism is applied to a case and a power supply, the power supply is provided with a mounting unit and an extrusion unit, the mounting unit is used for mounting a mounting seat and the power supply on the case in a split manner, and the extrusion unit is used for fixing the mounting seat in a mounting groove. According to the computer power supply fixing mechanism, the power supply can be conveniently taken out of the case and overhauled by dismounting the mounting seat from the case, meanwhile, the power supply is mounted outside the case, so that the mounting space is large, the mounting is convenient, the mounting seat is inserted into the sliding frame, and the mounting seat is extruded and fixed in the case under the action of the extrusion unit; and the mounting seat is quickly mounted in the mounting groove of the case, so that the mounting is simple, quick and stable.

The present invention discloses a reed-type micro-electromagnetic valve, which relates to the field of micro-electromagnetic valves. The micro-electromagnetic valves currently used in the market usually use electromagnetic matching springs to complete the opening and closing of the solenoid valves. However, the existing springs have a large installation space, are easily dislocated or deformed during use, and have poor stability. The following scheme is proposed, which includes a valve body, a protective shell for installation is provided inside the valve body, and a coil frame for installing a coil is provided inside the protective shell, and a reed for rebound is provided on the top of the valve body. The reed-type micro-electromagnetic valve replaces the spring with a hollow flat-plate reed provided inside, which can solve the problem that the spring installation space is large and the reed requires very little space, and achieves space optimization in terms of volume, while avoiding the problem that the spring is inconvenient to install, is easily dislocated or deformed during use, and has poor stability. At the same time, the insulating ring is convenient for blocking the magnetic circuit, making the magnetic force stronger.

The utility model discloses a marine energy storage box which comprises a box body, two rows of battery racks are arranged at intervals in the width direction of the inner space of the box body, a guide rail extending in the width direction of the box body is arranged on a bottom frame of the box body, and each row of battery racks are arranged on the guide rail in a sliding mode. Each row of battery racks is detachably fixed at a position away from the side wall of the adjacent box body by a first set distance, and the first set distance is not zero. The sliding guide rails are additionally arranged at the bottom of the battery rack, so that the battery rack can slide on the guide rails. When the battery pack is installed and maintained, the battery racks on the two sides are pushed to be tightly attached to the side inner walls, and therefore a larger installation space and a larger operation space are achieved when the battery pack is installed and maintained. When the energy storage box is used, the battery racks on the two sides can be pushed to the middle, enough space is provided for the two sides, and the requirement for the safe space between the battery pack and the side wall is met.

The utility model discloses a wireless AP equipment quick installation auxiliary tool, including wireless AP equipment, the top surface of wireless AP equipment is equipped with recess, the recess in the center position is equipped with the network mouth, the recess's inside upper portion is equipped with lower quick -mounting seat, the outside of lower quick -mounting seat is equipped with locking screw sleeve, the bottom of lower quick -mounting seat is equipped with lower locating plate, the inside of lower locating plate is equipped with lower connecting support, the inside of lower connecting support is equipped with lower wire -passing -through mouth. The utility model among them through upper connecting support and lower connecting support connection between mounting panel and wireless AP equipment, this structure can make wireless AP equipment have telescopic adjusting function, when upper connecting support and lower connecting support open, can hang wireless AP equipment in the air, also, expand the installation space between wireless AP equipment and roof, and the installation personnel can quickly find the position of network cable installation, make the installation of wireless AP equipment become convenient and fast.

The utility model discloses a slider connecting piece, drive stand and 3D printer to solve the technical problem of inconvenient installation and insufficient stability of the existing 3D printer slider connecting piece. The utility model discloses a bottom plate, mounting block, clamping post, the mounting block includes setting in the side surface of bottom plate, first mounting block for with slider fixed connection, the clamping post includes setting on the bottom plate and the first stand and second stand of up and down arrangement, and there is the clamping gap between first stand and second stand, and the position of first stand faces the clamping gap and is provided with first pawl, and the position of second stand faces the clamping gap and is provided with second pawl, first installation groove is formed between the clamping post and first mounting block, and the head and tail of toothed transmission belt all pass through the clamping gap. The utility model has the advantages of convenient installation and strong stability.

The utility model discloses a cover plate assembly and a battery cell module, the cover plate assembly comprises a cover plate main body, a pole and a fixing assembly, the cover plate main body is provided with a first through hole, the pole comprises a pole plate body and a pole main body, the first end of the pole main body is connected with the pole plate body, the second end of the pole main body penetrates through the first through hole, and the fixing assembly is arranged on the pole plate body. The cover plate body extends to one side, far away from the pole plate body, of the cover plate body; the part of the pole main body on one side, far away from the pole plate body, of the cover plate main body is fixed through a fixing assembly; the fixing assembly is made of solid metal. The first through hole with the hole diameter larger than that of the pole main body is formed, so that the pole main body penetrates through the first through hole, the pole main body and the cover plate main body are locked through the fixing assembly on the side, away from the pole plate body, of the pole main body, and the fixing assembly made of metal is higher in structural strength and easy to fix and install; and auxiliary structures such as a riveting die are not needed, so that the assembly difficulty and cost of the cover plate assembly are reduced.

The invention discloses an electric all-terrain vehicle which comprises a vehicle frame, a vehicle body covering part, a walking system, a power system, an electrical system and a cargo bucket, the vehicle frame comprises a front vehicle frame and a rear vehicle frame, the vehicle body covering part and the rear vehicle frame jointly form a cabin, a seat is arranged in the cabin, and the walking system comprises front wheels and rear wheels; the electrical system comprises a high-voltage electrical system, and the high-voltage electrical system comprises a power battery; the cargo bucket is located behind the seat and above the power system, and the power battery is located below the seat and in front of the power system; a mounting space is jointly defined among the seat, the goods bucket, the power battery and the power system, and a storage box is arranged in the mounting space; at least part of the storage box is located between the seat and the goods hopper, and at least part of the storage box is located between the power battery and the goods hopper. According to the electric bicycle, the power battery, the seat, the power system and other components have a reasonable arrangement form in the rear frame so that a large installation space can be vacated, and the arrangement form can achieve the good space utilization rate.

The invention discloses a vehicle thermal management system and a control method thereof, and relates to the technical field of vehicle engineering. The vehicle thermal management system comprises a first liquid cooling pipeline used for being connected to a heat dissipation object; and the at least two liquid cooling assemblies are connected to the two ends of the first liquid cooling pipeline respectively, and each liquid cooling assembly is selectively started and can refrigerate the cooling working medium in the first liquid cooling pipeline after being started. According to the vehicle thermal management system, due to the fact that the at least two liquid cooling assemblies are arranged, each liquid cooling assembly can be independently controlled and opened and closed, the starting number of the liquid cooling assemblies can be switched according to the heat dissipation requirement of the heat dissipation object, and therefore the refrigeration requirement of the heat dissipation object is met adaptively. And meanwhile, different liquid cooling assemblies can be assembled respectively by selecting available spaces in the equipment, so that the arrangement is more flexible, a larger mounting space does not need to be reserved independently, and the space can be utilized more reasonably.

This utility model belongs to the technical field of mufflers, and relates to an irregularly shaped muffler for large-displacement motorcycles. It includes a flat muffler cylinder, within which a muffler assembly is disposed, connecting an intake chamber and an exhaust chamber. The muffler cylinder is connected to the engine's exhaust port via the exhaust assembly. The exhaust chamber is connected to the outside via a first tailpipe and a second tailpipe arranged side-by-side along its long side. The intake chamber and the exhaust assembly are connected via a conical connector. The cross-sectional area of ​​the conical connector gradually decreases from the muffler cylinder towards the exhaust assembly. The exhaust assembly includes a rear connecting pipe, a catalytic sleeve, a first exhaust pipe, and a second exhaust pipe. The first and second exhaust pipes are respectively connected to the two exhaust ports of a motorcycle's twin-cylinder engine. The irregularly shaped muffler for large-displacement motorcycles provided by this utility model has higher exhaust efficiency and can better meet the emission requirements of large-displacement motorcycles.

The utility model provides an expansion type operation shelter, including lateral and top open main shelter body, top plate, upturning plate, downturning plate and flexible baffle body, the top plate is connected with the top of main shelter body through lifting mechanism, upturning plate is articulated with the outside of top plate, downturning plate is articulated with the outside of bottom plate of main shelter body, the flexible baffle body is articulated with the bottom plate of main shelter body. A first turnover mechanism for driving the upper turnover plate to rotate in the direction away from / close to the main cabin body is installed on the upper turnover plate, and the flexible blocking body surrounds the main cabin body and the unfolded top plate, the upper turnover plate and the lower turnover plate to form a closed cabin. Longitudinal and transverse expansion spaces are increased, and the requirement of medical staff for the operation height and the requirement of simultaneous operation of a plurality of patients are met.

The invention discloses a display module and electronic equipment, the display module comprises a display panel, a composite support structure and a through hole structure, the display panel comprises a main body part, a bending part and a fan-out part which are connected in sequence, and the fan-out part is bent and overturned to the back surface of the main body part through the bending part; the composite supporting layer is arranged between the main body part and the fan-out part; the through hole structure at least penetrates through the main body part, the composite supporting layer and the fan-out part, the through hole structure comprises a first hole section located on the main body part and a third hole section located on the fan-out part, and the size of the first hole section is smaller than that of the third hole section. According to the display module, a sufficient Z-axis space is provided for external functional components such as the camera through the through hole structure, a large installation space is provided for the external functional components, and the light and thin design of the display module is achieved.

The utility model provides a biaxial knife rest and rubber tapping device, the biaxial knife rest is provided on the rubber tapping device and is used for cutting the object to be cut, the biaxial knife rest comprises a knife arm part and a knife head part, the knife arm part is rotatably connected on the rubber tapping device, the knife head part comprises a first main shaft and a second main shaft, the second main shaft is used for installing a blade, a mounting space for mounting a blade is formed between the first main shaft and the second main shaft, the tool bit part is provided with a closed end and an open end, the first main shaft and the second main shaft are fixedly connected at the closed end, the first main shaft and the second main shaft protrude towards the direction far away from the tool arm part at the closed end, and the first main shaft and the second main shaft are movably connected with the tool arm part at the open end. According to the double-shaft tool rest, the installation space of the blades is enlarged, the blades are convenient to replace, the trafficability of tree chips at the tool bit part is good, the cutting efficiency is improved, and a rubber tapping device is prevented from being damaged.

The utility model relates to the technical field of sugar making, and discloses a carbonation tank scraper device which comprises a tank body, a plurality of carbon dioxide inlet pipes are fixedly arranged on the outer wall face of the tank body in a penetrating mode, and distribution openings distributed at equal intervals are formed in the outer wall face, in a tank body cavity, of each carbon dioxide inlet pipe. A scraping knife for blocking prevention and descaling of the distribution opening is arranged in the cavity of the tank body, a driving unit for driving the scraping knife is arranged on the outer wall surface of the tank body, the driving unit comprises a driving shaft and a speed reducing motor, and side scraping plates are arranged on the two side wall surfaces, close to the distribution opening, of the scraping knife. According to the carbon dioxide distribution device, the prior art is improved, the scraper is placed below the distribution opening, compared with a traditional mode that the distribution opening is installed in the carbon dioxide inlet pipe, the installation space is enlarged, the driving shaft is thickened, the service life is obviously prolonged, and therefore the maintenance cost is saved, and the economic benefits of enterprises are improved.

The conductive piece comprises a first connecting part and a second connecting part, the second connecting part is connected to one end of the first connecting part, the second connecting part and the first connecting part are arranged at an angle, and the two opposite sides of the second connecting part are a containing face and a fixing face respectively. The other two opposite sides of the second connecting part are a first side face and a second side face respectively, the side, away from the fixing face, of the containing face is used for being matched with the roll core, and the end of the roll core bypasses the first side face and / or the second side face to be fixed to the fixing face. According to the conductive piece provided by the invention, the tab of the roll core is directly welded on the fixed surface of the conductive piece, a rivet and a tab clamping plate are omitted, the tab is connected without the processes of punching, riveting and the like, and the connecting process is simplified. Meanwhile, parts such as rivets, tab clamping plates and the like are omitted, so that the weight of the battery is reduced, the mounting space of the roll core is increased, and when the volume of the roll core is increased, the capacity of the battery can be further improved.

The utility model belongs to the technical field of transformer manufacturing, and particularly relates to a silicon steel sheet double-inclined cutter set driving mechanism which comprises a first n-shaped portal frame, a second u-shaped portal frame and a telescopic cylinder, the first portal frame is fixed to a workbench and arranged above a sliding table in a crossing mode, the second portal frame is arranged in the first portal frame in a sleeved mode, and the telescopic cylinder is arranged on the second portal frame. The second portal frame has the freedom degree of sliding up and down relative to the first portal frame through the telescopic cylinder, the upper cutter is arranged on the opening side of the second portal frame, and the lower cutter is arranged on the opening side of the first portal frame. The second portal frame is additionally arranged and connected with the first portal frame in a sleeved mode, the telescopic cylinder drives the second portal frame to slide to drive the upper cutter to move, external force caused by movement of a silicon steel coil is resisted by means of the high structural strength of the second portal frame, the upper cutter is prevented from deviating, and the cutting quality of silicon steel sheets is guaranteed.

The utility model discloses a direct reuse type double-layer wave-shaped beam guardrail structure, which comprises an adjustable obstruction block, a double-wave plate, an old stand column and a new stand column, the adjustable obstruction block is composed of wing plates and two wave plate blocks, the two wing plates are welded in a way of being vertical to the two wave plate blocks, the back parts of the wing plates are opened, rib plates are respectively arranged above and below the wing plates, and the rib plates are connected with the old stand column and the new stand column. The section of the front face of the wing plate is the same as that of the two-wave plate block, the section of the two-wave plate block is the same as that of the double-wave plate, the back of the adjustable anti-blocking block is fixed to the new stand column in a bolting mode, the front portion of the adjustable anti-blocking block is attached to the double-wave plate, the old stand column and the new stand column are anchored in the road surface at intervals, and the double-wave plate is provided with two layers in the vertical direction. The guardrail has the beneficial effects that the protective capability of the transformed guardrail reaches A level or SB level; the existing guardrail structure is completely utilized, a large number of materials are saved, steel waste is reduced, and good economical efficiency is achieved; the original guardrail is not drilled or cut on site, the installation space of the novel obstruction block is large, the novel obstruction block and an old guardrail component can be adjusted, and construction and installation are easy and convenient.

The main machine module comprises a machine shell and a machine core, a mounting cavity is formed in the machine shell, the machine shell is further provided with an opening communicated with the mounting cavity, the machine core is mounted in the mounting cavity, and the machine core comprises a water pump, a water inlet pipe and an adapter. The two ends of the water inlet pipe communicate with the water pump and the adapter correspondingly, and the adapter is fixedly connected with the machine shell. According to the embodiment of the invention, the opening is formed in the shell, and at least the adapter is mounted in the mounting cavity through the opening, so that the shell does not block the process of mounting the adapter in the mounting cavity, the adapter can be conveniently and smoothly mounted in the mounting cavity from the opening, the stability of assembling the adapter and the water inlet pipe is improved, and the assembling efficiency is improved.

The present invention discloses an intelligent switch processing device in the technical field of intelligent switch processing, comprising an existing switch component, wherein the switch component comprises a base, a middle frame and a glass panel, and comprises a limit frame, wherein an upper trumpet mouth for guiding the middle frame to enter is provided at the upper end of the limit frame, a lower trumpet mouth for guiding the base to enter is provided at the lower end of the limit frame, and a limit square plate for limiting the descending depth of the middle frame is fixedly provided inside the limit frame; the present invention effectively solves the problem that when the existing intelligent switch is being assembled as a whole, the base is placed in a corresponding fixture for priority positioning, the middle frame is placed, and finally the glass panel is installed to complete the overall assembly; due to the strict process placement sequence, multiple devices are required to perform centralized operations around a positioning fixture with a small space, which leads to low work efficiency and excessively high production line costs.

The present invention discloses a stop-retreat device, an upward jacking type shaft excavation equipment and a shaft construction method, wherein the stop-retreat device comprises: a rotating mechanism, which is rotatably arranged relative to a pipe segment; a stop-retreat mechanism, which is installed on the rotating mechanism, and the stop-retreat mechanism comprises at least two movable stop-retreat structures, at least two movable stop-retreat structures are distributed along the circumference of the pipe segment, and at least two movable stop-retreat structures can expand outward or contract inward, and at least two fixed stop-retreat structures are arranged along the circumference of the inner side surface of the pipe segment, and the fixed stop-retreat structure abuts against the movable stop-retreat structure when the pipe segment is retracted. The stop-retreat device of the present invention can realize the stop-retreat position limiting of the pipe segment when the pipe segment retreats; when the pipe segment is pushed upward, the movable stop-retreat structure can be prevented from hindering the upward pushing of the pipe segment, and the displacement of the pipe segment during the upward pushing process can be prevented; before construction, a larger installation space can be provided for the installation of the starting structure, as well as the assembly of the pipe segment, the jacking device and the jacking device.

The invention discloses a hinge mechanism and electronic equipment, and belongs to the field of electronic equipment. The hinge mechanism comprises a base, a first swing arm and a first support, the first swing arm is arranged on one side of the base, and the first swing arm comprises a first rotating part and a second rotating part which are fixedly connected; one of the base and the first rotating part is provided with a first arc-shaped sliding groove, the other one of the base and the first rotating part is provided with a first arc-shaped sliding block, and the first arc-shaped sliding block is rotationally connected with the first arc-shaped sliding groove; one of the first support and the second rotating part is provided with a second arc-shaped sliding groove, the other one of the first support and the second rotating part is provided with a second arc-shaped sliding block, the second arc-shaped sliding block is rotationally connected with the second arc-shaped sliding groove, and the rotatable angle of the first swing arm relative to the base is larger than that of the first support relative to the base. And the rotating axial directions of the first arc-shaped sliding block and the second arc-shaped sliding block are parallel to each other.

The invention relates to the technical field of offshore power generation, and discloses a wind-solar combined power generation device. The photovoltaic generator set and the wind generator set are arranged on the mounting platform at the same time, so that the power generation device of the structure can integrate solar energy and wind energy, energy fluctuation can be reduced, power output is more stable, stable operation of a power grid can be guaranteed, the overall energy utilization rate is improved, dependence on a traditional power grid is reduced, and the power generation device is worthy of popularization and application. Therefore, the energy self-sufficiency rate is improved.

According to the technical scheme, the lock-shell-free low-cost backrest lock is characterized by comprising a cover plate, a locking assembly and a lock body assembly, the locking assembly and the lock body assembly are both rotatably installed on the surface of the cover plate, the locking assembly is used for limiting unlocking of the lock body assembly, the lock body assembly is connected with a lock body torsional spring, and the lock body torsional spring is connected with the cover plate. One end of the lock body torsion spring is connected with the cover plate, the other end of the lock body torsion spring is matched with the lock body assembly to drive the lock body assembly to be unlocked, the locking assembly is connected with a stop assembly, the stop assembly is used for driving the lock body assembly to be unlocked or locked, and the stop assembly and the locking assembly rotate coaxially. Therefore, the actual size of the cover plate is reduced, the manufacturing cost is further reduced, and assembly line production is easier due to the low cost.

The utility model discloses a trolley base lifting device which comprises a lifting driving device, a transmission shaft, a bottom plate, a first module, a second module and two cross beams. The lifting driving device is installed on the bottom plate, and the first module and the second module are connected to the two ends of the transmission shaft respectively. The two cross beams correspond to the first module and the second module respectively, and universal wheels are fixedly installed on the two sides of each cross beam. The first module and the second module each comprise a transmission module connected with the bottom plate and the cross beam. The transmission module is arranged between the cross beam and the bottom plate, the transmission module drives the cross beam to move up and down so that the lifting distance of the bottom plate can be controlled, the trolley can be switched between the moving state and the fixed state, mode switching is easy and convenient, and operation is easy; the transmission shaft is in transmission connection with the transmission module through the transmission belt, the size of the trolley is reduced, and the utilization rate of the internal space of the trolley bottom plate is increased.