74results about How to "Does not affect disassembly" patented technology

The invention discloses a heat pipe cooling system for a server cabinet. The heat pipe cooling system for the server cabinet comprises a first heat exchanger, a connecting pipeline and a second heat exchanger, wherein the first heat exchanger is arranged at a grid of at least one out of a front cabinet plate, a rear cabinet plate, a left cabinet plate and a right cabinet plate of the server cabinet, faces towards a hot air outlet and consists of a plurality of groups of heat pipes; the heat pipes are filled with refrigerant working media; the connecting pipeline is arranged between the first heat exchanger and the second heat exchanger; the refrigerant working media are subjected to circular evaporation-condensation gas-liquid phase transition between the first heat exchanger and the second heat exchanger through the connecting pipeline, so as to bring heat from the first heat exchanger to the second heat exchanger; and the second heat exchanger is arranged far away from the server cabinet, and exchanges the heat with an outside cooling system. According to the heat pipe cooling system for the server cabinet, the first heat exchanger for cooling a server is arranged at the grid of the cabinet plate of the server cabinet, so that the space of a server room is saved; and the first heat exchanger faces towards a hot air object directly for cooling, and the efficiency is improved.

The invention discloses a mechanical gear machining device which comprises an installation plate, a supporting plate, a horizontal air cylinder, a clamping groove, a brush, a supporting column, a fixing nut, a clamping seat, limiting blocks, a sliding groove, a connection block, a vertical air cylinder, sliding rails, a sliding table, a guide rail, a sliding seat, a rotary table, a fixed column, a tool, a motor, an adjusting column, an installation block and an operation handle. The mechanical gear machining device has the beneficial effects that gear chamfering, tooth crest chamfering and the like can be conducted in a multi-angle mode; the sliding table can slide on the sliding rails under the traction of the horizontal air cylinder, and the tool can conduct multi-face machining on a gear conveniently during machining; the two rubber limiting blocks are fixed to the side edges, close to the supporting plate, of the sliding table, so that the sliding table is prevented from knocking into the supporting plate during movement; the brush is a wire brush and can be detached freely from the interior of the clamping groove, and deburring treatment can be conducted on the gear through the wire brush; the position of the installation block can be adjusted up and down on the fixed column, and specific adjustment can be conducted on gears of different specifications.

The safe and diverse building curtain wall comprises a fixed steel piece, a clamping block, a movable sleeve, a suction cup and a side plate, a motor is fixed to the middle of the fixed steel piece through a bolt, the right end of a push rod is connected with a piston, the outer side of a fixed column is sleeved with a sleeve, and the outer side of a bottom plate is provided with the suction cup.A supporting rod is connected to the outer side of the movable sleeve, a connecting rod is connected between the sliding block and the fixed sleeve, the side plate is connected to the outer side of the supporting rod, a first air bag and a second air bag are arranged on the upper side and the lower side of the side plate correspondingly, and a curtain wall body is arranged on the outer side of theside plate. The safe and diverse building curtain wall capable of being stretched out and replaced can be conveniently disassembled and replaced, the curtain wall can be adjusted in a diverse mode, the decoration effect and the use safety of the curtain wall are improved, and meanwhile the air bag is arranged so that the curtain wall can be effectively sealed and installed in a waterproof mode.

The invention relates to an oil sprayer compress tightly screw cap. The oil sprayer compress tightly screw cap comprises an installing section and a screw thread section, the installing section is used for installing an oil sprayer couple part, a spring and a backing block, and the screw thread section is used for connecting the compress tightly screw cap and an oil sprayer body. The oil sprayer compress tightly screw cap is characterized in that a lengthening section is arranged, and the lengthening section is located above the screw thread section. The compress tightly screw cap is matched with a pressing plate or a compress tightly sleeve, so that an oil sprayer can be fixed on a cylinder cover, the interference of oil sprayer fixing structure with a valve spring and an air inlet and outlet rocker arm is eliminated, simultaneously the fuel gas in a cylinder can be effectively sealed, and assembly and disassembly are convenient.

The invention discloses a highly oil-resistant chloroprene rubber sealing gasket comprising the following raw materials in parts by weight: 35-145 parts of chloroprene rubber CR1211, 20-25 parts of epichlorohydrin rubber, 10-20 parts of SG-2 type PVC (Polyvinyl Chloride) resin, 2-5 parts of tri(2-ethylhexyl)acetocitrate, 3-5 parts of dioctyl epoxy tetrahydrophthalate, 3-5 parts of dibutyl maleate, 1-2 parts of sodium alcohol ether sulphate, 30-40 parts of nano argil, 30-35 parts of carbon black N220, 30-35 parts of nano calcium carbonate powder and the like. The chloroprene rubber sealing gasket has excellent oil resistance and solvent resistance, is capable of satisfying the sealing requirement on an engine sump, and is easy to peel after being solidified, and cleanable and repairable without affecting dismounting and repairing.

The invention relates to a line arranging structure which is assembled on a machine body and is used for arranging a line of the machine body. The machine body is provided with an assembly opening. The assembly opening is used for enabling at least one element to enter and get out of the machine body along at least one mounting path. The line arranging structure comprises a seat body, at least one tray and at least one line arranging clamp. The seat body is mounted in the assembly opening of the machine body. The tray is movably arranged on the seat body and has a first position and a second position relative to the seat body. When the tray is positioned in the first position, the tray blocks the mounting path. When the tray is positioned in the second position, the tray is far away from the mounting path. The line arranging clamp is arranged on the tray and is used for arranging the line.

The invention discloses energy-saving steel structure welding equipment, and belongs to the technical field of steel structure welding. The energy-saving steel structure welding equipment comprises asliding rail, the top of the sliding rail is slidably connected with a portal frame, the top of the portal frame is slidably connected with two positioning blocks, and the tops of the positioning blocks are provided with cleaning devices for treating smoke dust and gas extracted by exhaust pipes; the cleaning devices comprise positioning boxes fixedly arranged at the tops of the positioning blocks, exhaust fans are fixedly arranged at the ends, away from the exhaust pipes, in the positioning boxes, a heating assembly, an absorption assembly and a detection device are sequentially arranged in each positioning box, air discharging pipes are fixedly arranged at the ends, away from the exhaust pipes, of the positioning boxes, first electromagnetic valves are fixedly arranged on the air discharging pipes, circulating pipes are fixedly arranged at the positions, located on the air discharging pipes, of the positioning boxes, the ends, away from the exhaust pipes, of the circulating pipes extend into the positioning boxes and to the sides, away from the absorption assemblies, of the heating assemblies, and second electromagnetic valves are fixedly arranged on the circulating pipes. The equipment has the effect of reducing the emission of toxic gas carbon monoxide into the air.

The invention discloses a rubber seal ring which is prepared from, by weight, 50-80 parts of butadiene-acrylonitrile rubber, 20-30 parts of butadiene styrene rubber, 10-12 parts of epoxy butyl oleate, 3-5 parts of n-butyl methacrylate, 5-8 parts of n-butyl methacrylate, 3-4 parts of zinc stearate, 2-3 parts of flint clay powder, 5-8 parts of talcum powder, 3-5 parts of bamboo charcoal fibers, 2-3 parts of hollow microbeads, 10-12 parts of chlorinated paraffin, 3-4 parts of aluminium hydroxide, 5-8 parts of paraffinic oil, 1-3 parts of accelerant CBS, 0.5-0.8 part of a vulcanizing agent, 1-2 parts of an anti-aging agent RD and 1-2 parts of a titanate coupling agent TMC-TTS. The rubber seal ring has excellent wear resistance and high temperature resistance and meanwhile has acid and alkaline corrosion resistance, stripping is easy to conduct, after curing is conducted, the rubber seal ring can be cleaned, disassembling, assembling and repairing are not affected, compressibility and rebound resilience are good, and the rubber seal ring is not softened, decomposed or subjected to brittle rupture at a high temperature, can work for a long time in an acid medium, an alkali medium and the like and is durable in use.

The invention relates to a multilayer-roller-bed steering machine and a tree type roller bed conveying system of the dismantling industry thereof. The multilayer-roller-bed steering machine comprises a base and roller bed sections. The base comprises n layers of frames, and the edge portion of the frame of each layer is provided with a steering motor with a driving chain wheel and a limiting stopper. The steering machine comprises corresponding n layers of roller bed sections, the lower face of the middle portion of the roller bed section of each layer is connected with a driven chain wheel and a steering bearing and is in rotating fit with the upper face of the middle portion of the frame of each layer, the edge portion of the roller bed section of each layer is provided with a trigger block corresponding to the limiting stopper on the frame of each layer, the driven chain wheels are connected with the driving chain wheels on the frames of all layers through steering chains, and the upper portion of the roller bed section of each layer is provided with a material sensor for detecting materials. On the premise of reducing dismantling occupied area, conveying roller beds with multiplied length and the roller bed conveying system with doubled tree type join numbers are set up, economic and social benefits of abandoned automobile and electric appliance dismantling enterprises are substantially improved, and a novel way is provided for development and expansion of the abandoned automobile and electric appliance dismantling enterprises.

The invention relates to an integrated solar water heater and belongs to the technical field of a solar water heater. The integrated solar water heater comprises a cover board, an adsorption coating, a frame, a heat storage mechanism and heat conduction elements; the cover board is arranged above the adsorption coating; the cover board is fixed on the frame; the heat storage mechanism is arranged in the frame; the heat storage mechanism comprises an upper heat storage water tank, a lower heat storage water tank and a plurality of uniformly distributed heat storage water tanks, which are mutually communicated; the upper heat storage water tank and the lower heat storage water tank are respectively positioned at both sides of the plurality of heat storage water tanks arranged side by side; the heat conduction elements are arranged between the adsorption coating and the heat storage water tanks. The integrated solar water heater has a reasonable structure, good thermal conductivity and flow diversion and high heat collecting efficiency, can be completely integrated with a building, is convenient to mount and disassemble, can implement modularization of solar water heater units and is safe and reliable.

The invention discloses a wire rope fastening type positioning device capable of preventing objects from tilting. The wire rope fastening type positioning device comprises a first connection plate anda second connection plate. A steel wire rope is used for limiting and fixing; a long-distance limiting effect can be achieved; a long-distance mounting and limiting effect can be achieved between ananti-tilting part and a fixing part; a moment principle is used for achieving low-strength damage to mounting parts; meanwhile, stronger anti-tilting strength is provided; the device is provided withspherical structure shape and size type rotary connection mechanisms; the angle rotation can be achieved between fixing parts, so that tension trends to be straight; in addition, the device is provided with a thread structure adjusting type part limiting mechanism, so that the part limiting effect can be achieved; meanwhile, the disassembly of the parts is also not influenced; furthermore, the device is provided with a reverse thread structure type length adjusting mechanism, so that reverse threads are used for enabling the steel wire rope to be in a tightened state; and the safety is improved.

The invention discloses a plate heat exchanger convenient to disassemble and used for a geothermal recharge system, and relates to the technical field of plate heat exchangers. The plate heat exchanger comprises a heat exchanger assembly, a buckle mechanism, limiting rods and a driving mechanism, wherein the buckle mechanism is movably arranged inside the heat exchanger assembly, the limiting rodsare movably arranged on the two sides of the heat exchanger assembly, the driving mechanism is movably arranged inside the heat exchanger assembly, and the heat exchanger assembly comprises a mounting base plate, a positioning rod and a heat exchange plate sheet body. According to the plate heat exchanger, the heat exchanger assembly, the buckle mechanism and the driving mechanism are arranged, an operation block is moved upwards so that a movable rod can drive a positioning plate to release the limitation on the limiting rods, then the limiting rods can be pulled out of a containing groove,meanwhile, a driving rod is rotated to pull a movable plate to release the clamping on the heat exchange plate sheet body, and as a result, the problems that when a heat exchange plate sheet of a conventional heat exchanger is cleaned, a plurality of bolts need to be disassembled in sequence, time and labor are consumed in the process, and the disassembling and cleaning efficiency of the heat exchange plate sheet is influenced are solved.

The invention relates to the technical field of part assembly, in particular to an eccentric bushing alignment and recovery method based on an alignment and recovery assembly, a bushing inner hole positioning pin sequentially penetrate through an inner hole of an intersection bushing I on a first layer of lug piece and a bottom hole in a second layer of lug piece; an adapter bushing is inserted between the bushing inner hole positioning pin and the bottom hole in the second layer of lug piece; a marking bushing is arranged on the adapter bushing, then a bushing to be recovered is arranged on the bushing inner hole positioning pin in a sleeving mode, and the bushing to be recovered is rotated till the bushing to be recovered can completely enter the marking bushing; after the bushing to be recovered is pressed into 2/3 of the bottom hole in the second layer of lug piece, the marking bushing is detached, and then the recovery bushing is completely pressed into the bottom hole in the second layer of lug piece; and finally, the rest structure of the alignment and recovery assembly is detached from an insertion lug structure of an aircraft intersection point. According to the technical scheme, the recovery and replacement technological process for the eccentric bushing of the aircraft insertion lug structure is greatly simplified, the operation time can be effectively shortened, and the alignment and recovery assembly is simple in structure, light and convenient to carry.

The invention relates to an efficient mute vehicle-mounted air purifier. The efficient mute vehicle-mounted air purifier comprises a housing assembly, a filter element, a fan and a circuit assembly, wherein the filter element, the fan and the circuit assembly are arranged in the housing assembly, the fan is electrically connected with the circuit assembly, a purifying cavity and an air supplying cavity which are communicated are formed in the housing assembly, air inlets are formed in the periphery of the housing assembly in a 360-degree mode and correspond to the purifying cavity, an air outlet is formed in the top of the air supplying cavity, the air supplying cavity is located on the purifying cavity, the filter element is in a tubular shape and arranged in the purifying cavity, the air inlet is communicated with the air supplying cavity through the outer wall of the filter element, and the fan is arranged between the bottom of the air outlet and the upper portion of a center hole of the filter element. The air inlets of the vehicle-mounted air purifier are annularly formed in the outer side of a purifier body, air inlet without dead angle in a 360-degree mode is achieved, air inlet amount in unit time is increased, and the purifying efficiency is higher; the air outlet is formed in the top of the purifier body, air has enough travel in the purifier body and is fully purified, and air purifying quality is improved; in addition, the structure can effectively reduce noise.

The invention belongs to the technical field of tunnel supporting, and particularly relates to a film bag concrete and corrugated steel plate combined tunnel primary supporting structure which comprises a corrugated steel plate body and a film bag body. Connecting plates are welded to the two ends of each corrugated steel plate body, a plurality of fixing holes are formed in the connecting plates, every two adjacent corrugated steel plate bodies are fixed together through the corresponding connecting plate and spliced into an arch-shaped supporting plate, a film bag body is laid on the outer arc-shaped surface of each supporting plate, and the film bag bodies are laid along the inner concave faces of the outer surfaces of the corrugated steel plate bodies. The film bag body is filled with concrete; after the concrete in the film bag body is dried, the size is expanded and enlarged again, the sealing performance of the port of the pouring area is enhanced, construction operation is convenient, concrete screen pouring is conducted in the pouring area, the mortar overflow amount is reduced, and materials are saved; and meanwhile, the film bag body and the undried concrete are both flexible bodies and expand and support in accordance with the shape in the pouring area, so that the device is suitable for soft soil, expansive soil, collapsible soil and other areas with low foundation bearing capacity.

The invention discloses an anti-leakage sealing method of a double-stage material push centrifugal machine. The anti-leakage sealing method is characterized in that negative pressure is generated in aliquid cavity between a housing and an outer rotary drum so that in the process that an inner rotary drum does an axial reciprocating action during work of the centrifugal machine, the pressure of asolid cavity is larger than or equal to the pressure of the liquid cavity all the time; and the part, where the negative pressure is generated, of the liquid cavity is located in a drying area corresponding to an outer rotary drum filter cake concentrating part. In the working process of the centrifugal machine, the phenomenon that liquid in the liquid cavity back flows to a solid collecting cavity through a baffle, and the solid moisture percentage is increased is avoided or reduced, and therefore the solid-liquid separation effect is improved; and when the centrifugal machine stops working,an external negative-pressure pump system does not affect work such as demounting of a centrifugal machine body at all, a dynamic sealing device also retracts to reset under the effect of an elastic part, a certain distance is maintained between the dynamic sealing device and the housing, and demounting of the housing is not affected as well.

The invention belongs to the technical field of head-mounted displays, particularly to a head-mounted display sensor device. The head-mounted display sensor device comprises a display casing, wherein a sensor is arranged at the bottom of the display casing; an acute included angle alpha is formed by the axial direction of sensing signals of the sensor and the axial direction of the display casing; the axial direction of the sensing signals of the sensor points towards the outer side of the display casing; a signal through hole is formed in the part, corresponding to the sensor, on the display casing; a connecting conducting wire is arranged between the sensor and a main board of the head-mounted display. Arms can be lifted to be placed below the head-mounted display for action; the sensor senses signals through the signal through hole; the sensor is arranged at the bottom of the display casing, so that the arms of a user do not need to be placed in front of the head-mounted display for action, and the problems of fatigue and discomfort caused by the lifting gesture of the arms in operation are solved; the connecting conducting wire is arranged between a front cover and a bracket, so that the disassembly operation of the front cover cannot be influenced, the structure is simple, the assembly is convenient, and the production cost can be reduced.

The invention discloses an LED explosion-proof lamp convenient to dissipate heat and an application method thereof. The LED explosion-proof lamp comprises a lamp cover at the upper part of a lamp body, a heat dissipating tube surrounded on the lamp cover, a glass cover at the lower part of the lamp body, a heat dissipating tube network covering the glass cover and communicating with the heat dissipating tube, a heat conducting frame connected with a heat source and the inner wall of the lamp cover in the lamp body, and a circular cooling system connected between the heat dissipating tube and the heat dissipating tube network. The heat conducting frame directly contacted with the heat source is arranged in the lamp cover, and is connected with the inner wall of the lamp cover to quickly transmit heat to the lamp cover; the heat dissipating tube contacted with heat dissipating fins surrounds the lamp cover to increase the heat dissipating area; cooling liquid is introduced in the heat dissipating tube to quickly absorb the heat of the lamp cover; a power supply wire at the top end of the lamp cover penetrates in a wire penetrating pipeline to effectively isolate a circuit from a water channel to prevent potential safety hazards caused by water leakage or electric leakage; and the heat dissipating tube network and the heat dissipating tube are detachably connected to improve the heat dissipating efficiency without influencing both disassembly and maintenance of the explosion-proof lamp.

The invention belongs to the field of agricultural mechanical equipment, and particularly relates to a grain combine harvester. The grain combine harvester comprises a machine shell, a threshing cylinder, a grading sieve and a straw shredding device, wherein the threshing cylinder comprises a conical feeding cylinder body, a threshing cylinder body and a cylinder shaft, the conical feeding cylinder body is arranged at the front end of the threshing cylinder body, a feeding auger blade is installed on the conical feeding cylinder body, a weed discharging auger with a spiral blade is installed at the rear end of the threshing cylinder body, and threshing spike teeth are installed on the circumference of the threshing cylinder body; the front-end swing diameter of the feeding auger blade is larger than the rear-end swing diameter of the feeding auger blade and is matched with the width of a harvester header conveying gap bridge, the rear-end swing diameter of the feeding auger blade is matched with the front-end swing diameter of the threshing cylinder body, the straw shredding device is installed in the machine shell, and a straw outlet of the weed discharging auger is connected with the straw shredding device through a channel. By the adoption of the harvester, blocking during crop feeding and straw discharging is avoided, and normal working of the grain combine harvester is ensured.

The invention discloses a wastewater sampling method for comprehensive utilization of wastewater of wine brewing enterprises. The method comprises the steps that 1, a sampling device is rotated to separate the sampling device from a floating body, and the floating body is controlled to walk to a to-be-sampled area on the liquid surface of a wastewater pool by adopting a wireless remote control technology; 2, a winch is driven by a motor to release a cable, and the sampling device sinks to the sampling height under the action of self gravity; and 3, a controller controls the sampling device to sample one or more samples at the same sampling height. According to the sampling device disclosed by the invention, a plurality of sampling bottles are annularly distributed, each sampling bottle drives a shifting ring through the action of an electric sliding block to open the sampling bottle so as to complete sample collection, a water sampling inlet and a water pouring opening of the sampling bottle are separately arranged, and the water sampling inlet is formed in a bottle cap and is matched with the shifting ring to drive the sampling bottle to be opened and closed, so that the sample bottle can be stably fixed on a base, and the disassembly of the sample bottle after the sampling is finished is not influenced.

The invention provides a leakproof device for air conditioner refrigerant. The leakproof device comprises an inner connection pipe and a control valve assembly. One side of the inner connection pipe is connected with an interface of an outdoor unit of an air conditioner, and the end of the other side of the inner connection pipe fixedly communicates with a copper tube of the air conditioner. The control valve assembly is arranged in the inner connection pipe and comprises a push pipe, a seal disc, a seal plate, a first spring and a support plate. The support plate is located at the interface position far away from the outdoor unit of the air conditioner relative to the seal plate. The seal plate is provided with a seal hole. The seal disc extends toward the support plate to form a guide rod. The end of the guide rod penetrates the support plate. The first spring is mounted on the guide rod in a sleeving manner. One end of the first spring abuts against the seal disc, and the other endof the first spring abuts against the support plate. The support plate is provided with a first through hole. A jacking rod extends out of the push pipe. By means of the leakproof device, circulationof cooling liquid is not hindered when the air conditioner is used normally; and the leakproof device can be closed automatically when the air conditioner needs to be dismounted and moved, so that thecooling liquid is prevented from leaking. The leakproof device has the beneficial effects of being reasonable in structure, low in cost, economical and environmentally friendly.

The invention relates to the technical field of reinforcement cage hoisting, in particular to a reinforcement cage circulating reinforcement hanging device and a using method thereof. The reinforcement hanging device comprises a hoisting component and a hanging component, a connecting component is arranged between the hoisting component and the hanging component, the hanging component is used for being connected with a reinforcement cage, a hanging space is formed in the hoisting component, the hanging space is used for being connected with a hoisting mechanism, a positioning rod is arranged in the hanging space in a penetrating mode, and the positioning rod can be in lap joint with a pile hole. After the reinforcement cage is hoisted in place in the pile hole, the positioning rod is inserted into the hanging space, the two ends of the positioning rod are supported to the two sides of the pile hole, so that the positioning rod can serve as a force bearing component of the reinforcement cage in the pile hole pouring process, a hook of the hoisting mechanism can be conveniently moved out of the hoisting space, the hoisting mechanism is prevented from being occupied in the pile hole pouring process, and the construction efficiency is improved.

The present invention discloses a detonator code identification device. The detonator code identification device comprises light sources and an identification unit. Each light source is located in a location where dazzling light cannot be formed when identification light emitted from the light source irradiates on a detonator and enters the identification unit after being reflected, and the identification unit is mounted on a location where the code on the detonator can be identified. According to the detonator code identification device disclosed by the invention, the condition that the identification of the detonator code without considering a routing mode of scanning parts can be achieved, the detonator code identification device is simple in structure, convenient in operation, and has greater advantages.

The invention discloses a clothes zipper. The clothes zipper comprises a zipper head, wherein the zipper head comprises a locking component and a zipper handle, the locking component comprises a mainbody and an arc-shaped component; a fixing block 1 is fixed to one end of the outer side of the main body of the locking component; one end of the arc-shaped component is connected with the fixing block 1 through a connecting pin; the other end of the arc-shaped component is a free end, and a fixing block 2 is fixed to the inner wall of the free end; a compression spring 1 is fixed to one end, away from the arc-shaped component, of the fixing block 2; a fixedly clamping block is fixed to one end, away from the fixing block 1, of the compression spring 1; a connecting plate is fixed to one end,near the fixing block 1, of the locking component; a connecting hole is formed in the connecting plate; the fixedly clamping block runs through the connecting hole; and through connection of the arc-shaped component and the main body of the locking component by virtue of the connecting pin, the arc-shaped component can be opened, and thus the zipper handle can be detached, so that people can replace the zipper handle conveniently, and when the zipper handle is damaged, inconvenience in use due to incapability of detaching the zipper handle is avoided.

The invention discloses an engine experiment stand and an application method thereof. The engine experiment stand comprises a first vertical post, a second vertical post, a third vertical post, a cross beam, a process speed changing box and an auxiliary tool, wherein one side of the process speed changing box is connected with the cross beam, the other side of the process speed changing box is connected with the third vertical post, the auxiliary tool is selectively arranged between the process speed changing box and the cross beam, and the auxiliary tool is connected between the process speedchanging box and the cross beam so that the process speed changing box is maintained firmly when an engine is disassembled from the engine experiment stand. In the engine experiment stand, the process speed changing box is maintained on the engine experiment stand, the engine is only needed to be installed when experiment is needed, the engine is only separately disassembled after the experimentis ended, so that the process step is reduced, time and labor are saved, and engine the experiment stand has relatively high safety and operation convenience; and by additionally arranging the auxiliary tool, the stability of the process speed changing box can be further improved in a non-experiment state after the engine is disassembled, so that the stability of the whole engine experiment standis improved.