33results about How to "Speed up take away" patented technology

The invention discloses a steam sterilizing method, which comprises a sterilizing treatment procedure and a sterilizing treatment post cooling procedure. Before the sterilizing procedure, the interior of a sterilizing chamber is preheated by adopting the hot air provided by a first hot air draught fan; and meanwhile, a second hot air draught fan connected with a hot air inlet of the sterilizing chamber through a storage steam heat exchanger is opened to preheat the storage steam heat exchanger. After the preheating treatment for the sterilizing chamber and the storage steam heat exchanger reaches a set temperature, the material is continuously preheated by the first hot air draught fan; and after the preheating treatment is finished, the material to be sterilized is sterilized by high-temperature steam or over-heated steam. The sterilizing method is simple and efficient, and avoids the problem that the high-temperature steam caused by the sterilizing method without the preheating treatment is condensed in the sterilizing chamber to damp the material so as to influence the quality.

The invention discloses a lithium battery energy storage system cabinet automatic fire extinguishment device and system. The fire extinguishment device comprises an aerosol fire extinguishment system, a water injection fire extinguishment system, an electrical fire detection device, a battery fire detection device and a control system. The electrical fire detection device and the battery fire detection device are both arranged in an energy storage system cabinet. The aerosol fire extinguishment system, the water injection fire extinguishment system, the electrical fire detection device and the battery fire detection device are all connected with the control system. The fire extinguishment system comprises a control system, an aerosol fire extinguishment system, multiple water injection fire extinguishment systems, multiple battery fire detection devices, a water inlet mother pipe, a water outlet mother pipe and multiple battery bins. The liquid immersion type fire extinguishment scheme is adopted, batteries are isolated from air by injecting liquid till the batteries are completely immersed, heat generated by battery faults is rapidly brought away through convective circulation at the same time, combustion inside and outside battery units is fundamentally eliminated, and harm caused by secondary accidents to the system and maintenance personnel is eradicated.

The invention discloses atmospheric dust concentration measurement equipment and a measurement method of the atmospheric dust concentration measurement equipment. The measurement equipment comprises a case, wherein a vertical pipe is arranged at the upper end of the case; a heating pipe and a dehumidification pipe are fixed in the vertical pipe from top to bottom; the lower end of the heating pipe is butted with the upper end of the dehumidification pipe; a sampling port is formed in the upper end of the heating pipe; a dust concentration measuring instrument is arranged in the case; an inlet of the dust concentration measuring instrument is communicated with the lower end of the dehumidification pipe; an outlet of the dust concentration measuring instrument is communicated with a suction power device; the suction power device is fixed in the case. According to the measurement equipment, moisture in atmosphere can be rapidly removed, so that humidity of dust-containing air entering the atmosphere sampling measurement equipment is low, the influence of the air humidity on the accuracy of the dust concentration detection result is reduced as much as possible, and the accuracy of the detection result of the dust concentration measuring instrument at high air humidity is improved.

The invention relates to a double helix water flow cylinder type efficient cooler which comprises a cylinder body, an internal sleeve and a helix pipe and is characterized in that the interior of the cylinder body is provided with a rotational flow generating device, and the rotational flow generating device is composed of an outer diversion sleeve, an inner diversion sleeve, a ring-shaped partition plate and a sealing plate; an outer ring guide space is formed between the outer diversion sleeve and the cylinder body wall, and the outer ring guide space is corresponding with the outer side space of the helix pipe; an inner ring guide space is formed between the inner diversion sleeve and the outer diversion sleeve, and the inner ring guide space is corresponding with the inner side space of the helix pipe; the walls of the outer diversion sleeve and the inner diversion sleeve is uniformly distributed with a diversion hole, and the diversion hole is arranged in the vortex direction of that the center extension line of the circumferential direction doesn't pass through the shaft center; the outer diversion sleeve and the bottom of the inner diversion sleeve form a water inlet chamber, and one end of the water inlet chamber is communicated with a cooling water inlet pipe and the other end of the water inlet chamber is communicated with the inner and outer ring guide space through each diversion hole. The cooling water of the invention can be divided into the inner and outer streams which spirally upwards flow in order to result in that the inner and outer sides of the helix pipe are uniformly cooled, which thereby finally improves the efficiency of heat exchange.

The invention discloses a high-efficient external pipe evaporation heat exchanger with disturbance and safe oil return, and the invention aims at providing the external pipe evaporation heat exchanger which can prevent hydraulic hit accidents, enhance heat exchange effect and return oil safely. Space between a first seal head and a first pipe plate is divided into a second shunt chamber and a liquid gathering chamber through a first partition board, the space between a second seal head and a second pipe plate is divided into a first shunt chamber and a third shunt chamber through a second partition board, a plurality of vertical heat exchange flat pipes are arranged in parallel and positioned in the lower space in a casing body, one part of the vertical heat exchange flat pipes communicate the second shunt chamber with the first shunt chamber, the other part of the vertical heat exchange flat pipes communicate the second shunt chamber with the third chamber; and a horizontal heat exchange flat pipe is arranged in the upper space in the casing body and communicates the liquid gathering chamber with the third shunt chamber. The space in the casing body of the evaporation heat exchanger is increased and smooth, and the bubble rising resistance out of the heat exchange pipes is reduced, thereby facilitating the rapid rise of bubbles and enhancing the heat exchange effect. The evaporation heat exchanger can avoid the droplet entrainment in gas and prevent the hydraulic hit accidents.

The invention relates to an aluminum powder pigment which comprises the following components of 90 plus or minus 1 part of aluminum powder and 9 plus or minus 1 part of fumed silica according to the parts by weight. After the fumed silica is added in the aluminum powder pigment, the aluminum powder pigment has good dispersibility and high flatness, and the electrostatic spraying process is easily implemented. The invention also provides a preparation method for the aluminum powder pigment.

The invention discloses a high-efficiency spray condensation heat dissipation absorption tower, which comprises a tower tank, a drainage pipe, a water collection tank, a water pump, a water pump, a chemical raw material steam outlet pipe, a heat absorption condensation pipe, a fan, a spray discharge, a flow meter, a gas booster Pressure pump and chemical raw material steam inlet pipe, the bottom of the tower tank is provided with support legs, and the tower tank is equipped with a heat absorption condensing pipe, one end of the heat absorption condensing pipe is connected with the chemical raw material steam inlet pipe, and the other end of the heat absorption condensing pipe is It is connected with the chemical raw material steam outlet pipe, the chemical raw material steam inlet pipe is equipped with a gas booster pump, the top of the tower tank is equipped with a spray discharge, the inner wall of the tower tank is equipped with a fan, and the bottom of the tower tank is equipped with a drain pipe, the drain pipe and the water collection tank The outlet end of the water suction pipe is connected with the spray row, the inlet end of the water suction pipe is arranged in the water collection tank, and the water pump is arranged on the water suction pipe. The invention accelerates heat loss and condensation, improves work efficiency, avoids waste, reduces cost, has simple structure, is convenient to use, and is beneficial to popularization.

The invention discloses a textile airing device with a clamping structure and a using method of the textile airing device. The textile airing device comprises two airing supporting columns; the airing supporting columns are of trapezoidal structures; a plurality of airing supporting rods are arranged between the two airing supporting columns; and the plurality of airing supporting rods form a V-shaped airing surface between the two airing supporting columns. According to the textile airing device with the clamping structure and the using method of the textile airing device, textile cloth is aired in a V shape, and meanwhile, an airing ejector rod is driven to ascend and descend through the transmission cooperation between a gear and a lifting plate, so that the airing requirements of the textile cloth with different lengths are met, and the application range of the device is effectively expanded; meanwhile, a clamping mechanism is further arranged, a plurality of clamping supporting rods are used for synchronously clamping all parts of the textile cloth, and air holes are further formed while the good clamping effect is ensured, so that the airing effect of the parts, at the clamping positions, of the textile cloth is improved, and the possibility that the textile cloth is blown away in the weather with the high wind speed is further reduced; and the clamping is convenient, and the actual use is facilitated.

The invention discloses sealing drying equipment. The sealing drying equipment comprises a rack and a drying barrel fixed to the rack. The drying barrel is in a hollow cylindrical shape. A clamp piece is arranged on the end face, opposite to the drying barrel, of a material door and surrounds the edge of the end face by a circle. A clamp groove matched with the clamp piece is formed in the position, aligned to the clamp piece, of the drying barrel and surrounds a material opening of the drying barrel. The clamp piece is covered with a layer of sealing gasket. The section of the clamp groove is in an inverted T shape, and the width of a groove opening of the clamp groove is smaller than that of a groove bottom of the clamp groove. The sealing drying equipment has the beneficial effects that the clamp piece is arranged on the material door of the sealing drying equipment, the clamp groove is formed in the drying barrel and surrounds the material opening, the material opening is sealed by means of clamping of the clamp piece and the clamp groove, and the sealing performance of the material opening is guaranteed; and the groove opening of the clamp groove is smaller than the groove bottom, the sealing gasket is pressed at the groove opening to the largest degree, the groove bottom is in a loosening state, and therefore when the material door is dragged, the sealing gasket at the groove bottom needs to be pressed firstly, the greater the material door is dragged, the larger the extrusion is, and the sealing performance is guaranteed.

The invention discloses a drying device. The drying device comprises a rack and a drying cylinder fixed to the rack. The drying cylinder is in a hollow cylinder shape. A material door is arranged on the side face of the drying cylinder, a material frame matched with the position of the material door is arranged in the drying cylinder, and an air inlet device is arranged on the rack. The air inlet device comprises an air pump, a heater and a dryer. An air outlet of the air pump communicates with an inlet in the lower end of the drying cylinder through the dryer and the heater. An air inlet of the air pump communicates with an outlet in the top of the drying cylinder. The top of the drying cylinder is in an inverted bowl shape. A spiral groove is formed in the side wall of the interior of the drying cylinder. The drying device has the beneficial effects that air heat is used for heating and drying materials, and compared with an ordinary electric heating device, the drying device can prevent the situation that vapor stays at the place around the materials for a long time and slows down drying; and the spiral groove is formed in the inner side of the drying cylinder of the drying device, air circulation is accelerated, vapor can be brought away more quickly, and the drying speed is increased.

The invention discloses a purification exhaust pipe. The purification exhaust pipe comprises a shell, wherein the shell comprises an inlet cavity and an outlet cavity and is characterized in that twoshunting cavities communicate between the outlet cavity and the inlet cavity; transversely arranged communication pipes are arranged on the two side walls of the outlet cavity; evaporation air bags are symmetrically arranged on the inner side wall of each communication pipe and filled with evaporation liquid; a first magnet is slidably connected to the inner wall of each communication pipe; and apressure plate is slidably connected in the outlet cavity. According to the purification exhaust pipe, tail gas impacts on the pressure plate, and the kinetic energy of the tail gas is converted intothe kinetic energy of the pressure plate, so that the kinetic energy of the tail gas is reduced, the noise energy generated by the tail gas is synchronously weakened, and thus the noise is lowered; and the high-temperature tail gas is rapidly cooled under the action of cooling liquid, and the high-temperature damage of the tail gas to an exhaust system is greatly reduced due to the lowering of thetemperature, so that the service life of the exhaust pipe is effectively prolonged.

The invention discloses a rapid gas chromatograph cooling device and relates to the technical field of gas chromatograph cooling. In order to solve the problem that the conventional device is long incooling time, the rapid gas chromatograph cooling device comprises a column box, a motor, an exhaust fan and a suction ventilator, wherein a hollow shaft penetrates through the middle of the top of the column box; an inverted U-shaped shaft is fixedly welded at the bottom of the hollow shaft; the motor is arranged at a position, which is positioned on one side of the hollow shaft, of the top of the column box by virtue of screws; a first gear is arranged at the end of the output shaft of the motor; a second gear is arranged on the top of the hollow shaft; the first gear is meshed with the second gear; a disc is arranged on the top of the rotating shaft; a plurality of through holes are uniformly formed in the disc; and fan blades are arranged at positions, which are positioned below the disc, of the rotating shaft. According to the arrangement of the motor, the first gear, the second gear, the hollow shaft, the inverted U-shaped shaft and the suction ventilator, the hollow shaft drivesthe inverted U-shaped shaft to rotate, so that the interior of the column box can be fully subjected to heat dissipation and cooling. Due to the arrangement of the rotating shaft, the disc and the fan blades, cyclone is formed, the heat is accelerated to take away, and the cooling efficiency is further improved.

A double-helix water flow cylinder type high-efficiency cooler, including a cylinder body, an inner sleeve, and a spiral tube, is characterized in that: a swirl flow generating device is provided at the bottom of the cylinder body, and the swirl flow generating device is composed of an outer flow guide sleeve and an inner flow guide sleeve , an annular partition and a sealing plate; an outer ring guide space is formed between the outer diversion sleeve and the cylinder wall, and the outer ring guide space corresponds to the outer space of the spiral tube; an inner ring guide space is formed between the inner guide sleeve and the outer guide sleeve , the guiding space of the inner ring corresponds to the inner space of the helical tube; the first and second guiding holes are evenly distributed on the wall surfaces of the outer guiding sleeve and the inner guiding sleeve, and the vortex that their central extension lines do not pass through the axial center in the circumferential direction The direction of rotation is set; the bottom of the inner cavity of the outer diversion sleeve and the inner diversion sleeve forms a water inlet chamber, one end of which is connected to the cooling water inlet pipe, and the other end is guided to the space by the first and second diversion holes and the inner ring , The outer ring guides the spatial connection. The cooling water of the present invention can be divided into two helical strands, inner and outer, to flow upwards, so that the inner and outer sides of the helical tube can be cooled uniformly, thereby finally improving the heat exchange efficiency.

The invention relates to a drying device and electrical equipment. The drying device comprises a shell and a jet flow part. The shell is arranged in a drying chamber and is provided with a gas inlet part for gas flow to pass through. The jet flow part is arranged on the shell, is configured to communicate with the gas inlet part and the drying chamber and is used for outputting the gas flow in the gas inlet part into gas jet flow sprayed towards the drying chamber. During drying operation, after external gas flow enters the gas inlet part, high-speed flowing gas jet flow is formed under the effect of the jet flow part, and the gas jet flow is jetted out through the jet flow part. At the moment, vacuum or negative pressure is formed in a certain area near the jet flow part under the effect of the gas jet flow, the gas flow in the drying chamber flows to the vacuum or negative pressure area in an accelerated mode under the disturbance of the gas jet flow, and therefore convection in the drying chamber is accelerated and strengthened, water stains on tableware can be taken away in an accelerated manner, and the drying efficiency is improved.

The invention discloses a power distribution cabinet for water conservancy equipment, and the power distribution cabinet comprises a cylindrical housing, the interior of the cylindrical housing is recessed inwards in the axial direction of the cylindrical housing to form a channel, the channel penetrates the left and right ends of the cylindrical housing, and a closed cavity is formed between theinner wall of the channel and the outer wall of the cylindrical housing in a surrounding manner. A water pump blade is rotatably connected in the channel, the water pump blade is in transmission connection with a driving motor through a transmission shaft, the outer wall of the columnar shell and the inner wall of the channel can make contact with water, the overall heat dissipation area is relatively large, meanwhile, water in the channel can continuously flow under driving of the water pump blade, water circulation is accelerated, and heat is brought away. A liquid carbon dioxide tank and astorage bin are fixed to the outer wall of the columnar shell, an air bag is bound in the storage bin, when the columnar shell needs to be fished and overhauled, carbon dioxide gas can be released into the air bag through the liquid carbon dioxide tank so that the air bag can be filled with the carbon dioxide gas, buoyancy can be generated, and therefore the heavy columnar shell can be fished outconveniently.

The invention discloses drying equipment easy to clean. The drying equipment comprises a rack and a drying cylinder fixed to the rack. The drying cylinder is of a hollow cylinder shape, the top of the drying cylinder is provided with an upper cover, the upper cover is of an inverted-bowl shape, and the upper cover is hinged to the drying cylinder; and the lower end of the drying cylinder is provided with a lower cover, the lower cover is of a bowl shape, the lower cover is hinged to the drying cylinder, and the side wall inside the drying cylinder is provided with spiral grooves. The drying equipment easy to clean has the advantages that the upper end and the lower end of the drying cylinder are both provided with the arc covers, and water vapor slides to the side end of the arc upper cover along the arc after being formed and cannot drip on a material; besides, it is convenient to clean water drops condensed on the upper cover before the drying equipment is used, and it is convenient to clean water drops and impurities in the drying cylinder through the lower cover.

The invention discloses easily cleaned anti-oscillation drying equipment. The easily cleaned anti-oscillation drying equipment comprises a frame and a drying barrel fixed on the frame. The drying barrel is hollow cylindrical, an upper cover which is in a reversely buckled bowl shape is arranged on the top of the drying barrel, the upper cover is hinged to the drying barrel, a lower cover which is bowl-shaped is arranged at the lower end of the drying barrel, the lower cover is hinged to the drying barrel, a spiral slot is formed in the inner side wall of the drying barrel, a material rack is disc-shaped, a retainer ring is arranged in a position of the material rack in the drying barrel, at least two bolts which are consistent in size are uniformly arranged on the upper end surface of the retainer ring along the circumference, and insertion holes matched with the bolts are formed in the lower edge of the material rack. The equipment disclosed by the invention has the beneficial effects that in the equipment, the bolts are arranged on the retainer ring, corresponding insertion holes are formed in the material rack, and the bolts can be inserted into the insertion holes when the material rack is placed on the retainer ring to stable the material rack, so that the material rack is prevented from oscillating in a transportation process.

The invention belongs to the technical field of foods with special purposes, and provides an antioxidant blueberry anthocyanin tablet and a preparation method thereof. The antioxidant blueberry anthocyanin tablet provided by the invention is prepared from the following raw materials in parts by weight: 34-42 parts of blueberry anthocyanin, 8-15 parts of a black fungus extract, 1-4 parts of a tremella extract, 2-5 parts of tomatoes, 2-6 parts of white gourds, 1-5 parts of a mushroom extract, 1-5 parts of bitter gourds, 1-4 parts of fresh jujubes, 2-5 parts of oat, 3-7 parts of spinach, 5-9 parts of pregelatinized starch, 4-10 parts of beta-cyclodextrin and 8-20 parts of xylitol. The antioxidant blueberry anthocyanin tablet prepared by the invention can effectively scavenge free radicals, has good antioxidant ability, and plays an important role in promoting human health.

The invention discloses fast drying equipment easy to clean. The fast drying equipment comprises a rack and a drying barrel fixed to the rack. The drying barrel is in a hollow cylindrical shape. An upper cover is arranged at the top of the drying barrel, is in an inversely-buckled bowl shape and is hinged to the drying barrel. A lower cover is arranged at the lower end of the drying barrel, is in a bowl shape and is hinged to the drying barrel. A spiral groove is formed in the inner side wall of the drying barrel. A material rack is in a disc shape. A circle of check ring is arranged at the position, on the material rack, in the drying barrel. The radius of the material rack is larger than the inner diameter of the check ring and smaller than the inner diameter of the drying barrel. The material rack is full of ventilation holes. The fast drying equipment has the beneficial effects that the material rack is a disc carried on the check ring and can be taken out after the upper cover is opened, and cleaning is facilitated; and the material rack is full of the ventilation holes, acceleration can be achieved after air passes through the ventilation holes, and a good effect is achieved on material drying.

The invention discloses a water mist fan with an improved structure. The water mist fan comprises a machine body, a base and a fan head arranged on the machine body. The fan head, the base and the machine body are connected into a whole, an atomizing device is arranged on the machine body, water is atomized by the water mist fan through an ultrasonic atomizer, water mist is ejected from the center position of an air outlet in the front end of the fan head, when the fan head blows, an air flue on the inner side of a wind scooper guides air generated by the fan head to an air guide opening, thus, the air is blown out from the air guide opening and meanwhile brings away and emits the water mist, the structure of the air flue is simple and practical, the water mist and the wind are fully mixed, and the blowing effect is better. The air flue can effectively centralize wind power, the air blown out from the air flue is enhanced and rapidly brings away the water mist, the situation that water drops are formed by the water mist around a spray opening is effectively avoided, and the use satisfaction of the water mist fan is improved.

The invention discloses easily cleaned quakeproof drying equipment. The easily cleaned quakeproof drying equipment comprises a frame and a drying barrel fixed on the frame. The drying barrel is hollow cylindrical, an upper cover which is in a reversely buckled bowl shape is arranged on the top of the drying barrel, the upper cover is hinged to the drying barrel, a lower cover which is bowl-shaped is arranged at the lower end of the drying barrel, the lower cover is hinged to the drying barrel, a spiral slot is formed in the inner side wall of the drying barrel, a material rack is disc-shaped, a retainer ring is arranged in a position of the material rack in the drying barrel, the radius of the material rack is greater than the inner diameter of the retainer ring, the radius of the material rack is smaller than the inner diameter of the drying barrel, ventilating holes are formed in the material rack, a quakeproof gasket is arranged at the edge below the material rack, the radius of the quakeproof gasket is greater than the retainer ring, and an elastic gasket is arranged at the periphery of the material rack. The equipment disclosed by the invention has the beneficial effects that as the quakeproof gasket is arranged in the bottom of the material rack and the elastic gasket is arranged at the periphery, the material rack and the drying barrel colliding with each other in a transportation process will not be damaged.

The invention relates to an aluminum alloy heat dissipation device with automatic sealing mechanisms. The aluminum alloy heat dissipation device with the automatic sealing mechanism is characterized by comprising a heat dissipation base, a plurality of cooling fins, the plurality of automatic sealing mechanisms and a plurality of screws, wherein a first water guide hole and a plurality of auxiliary cavity holes are formed in the heat dissipation base, the auxiliary cavity holes comprise left vertical holes, middle vertical holes, right vertical holes and inner cavities, second water guide holes and jacking columns are arranged on the cooling fins, all the automatic sealing mechanisms are mounted in the inner cavities in a one-to-one correspondence manner, the automatic sealing mechanisms comprise sealing parts and jacking springs, the sealing parts comprise sealing pressing plates, flow guide blocks, guide columns, left flow guide cylinders and right flow guide cylinders, and all the cooling fins are arranged on the top surface of the heat dissipation base. According to the aluminum alloy heat dissipation device, enterprises can select a proper number of cooling fins according to actual heat dissipation requirements, the use is more flexible, and the cost input of the enterprises can be greatly reduced; and the aluminum alloy heat dissipation device further has the advantages of being simple in structure, high in reliability, good in heat dissipation effect, low in maintenance cost and the like.

The invention discloses high-sealing drying equipment which comprises a rack and a drying cylinder fixed to the rack. The drying cylinder is of a hollow cylinder shape, the end face, opposite to the drying cylinder, of a material door is provided with a clamping piece surrounding the edge of the end face, and the clamping piece is of an annular shape; and the position, aligned with the clamping piece, of the drying cylinder is provided with a clamping slot matched with the clamping piece, the clamping slot surrounds a material opening of the drying cylinder, and the clamping piece is covered with a layer of sealing pad. The high-sealing drying equipment has the advantages that the material door of the high-sealing drying equipment is provided with the clamping piece, the drying cylinder is provided with the clamping slot, the clamping slot surrounds the material opening, the material opening is sealed through clamping of the clamping piece and the clamping slot, and sealing performance of the material opening is guaranteed.

Disclosed is a self-warning sealing drying facility. The self-warning sealing drying facility comprises a machine frame and a drying cylinder, wherein the drying cylinder is fixedly arranged on the machine frame. The drying cylinder is in a hollow cylinder shape. A clamping part is arranged at the end, facing the drying cylinder, of a material door and surrounds the end of the material door. A clamping groove which is matched with the clamping part is formed in the portion, aligning to the clamping part, of the drying cylinder, and surrounds a material opening of the drying cylinder. A sealing gasket covers the clamping part. The section of the clamping groove is convex, and the width of the groove opening of the clamping groove is smaller than that of the groove bottom of the clamping groove. A humidity sensor is arranged in the drying cylinder, and the signal output of the humidity sensor is connected to an alarm on the machine frame. The self-warning sealing drying facility has the advantages that due to the fact that the humidity sensor is arranged in the drying cylinder, the drying degree of the interior of the drying cylinder is monitored in real time, an alarm is given after drying is accomplished, and a worker is reminded that drying is accomplished.

The invention discloses anti-oscillation quickly mounted drying equipment. The anti-oscillation quickly mounted drying equipment comprises a frame and a drying barrel fixed on the frame. The drying barrel is hollow cylindrical, a retainer ring is arranged in a position of a material rack in the drying barrel, at least two bolts are uniformly arranged on the upper end surface of the retainer ring along the circumference, insertion holes matched with the bolts are formed in the lower edge of the material rack, the insertion holes which are consistent in size are formed in a same circumference, an annular guide slot is formed in positions of the insertion holes at the lower end of the material rack, the width of the guide slot is consistent to the bore diameter of the insertion holes, and all the insertion holes are in the guide slot. The equipment disclosed by the invention has the beneficial effects that as it is troublesome and time-consuming to align the insertion holes to the bolts, the bolts relatively easy to enter the guide slot as the guide slot is formed in the insertion holes, and then the material rack is rotated, so that the bolts are easily inserted into the insertion holes.