CN105783444A - Automatic-temperature-control gas-heating vertical cabinet type movable and multipurpose drying machine - Google Patents

Abstract

The invention relate to an automatic-temperature-control gas-heating vertical cabinet type movable and multipurpose drying machine. The drying machine is composed of five parts including a drying box, a hot blast heater, a gas heating device, an automatic temperature control instrument and a movable chassis; the drying box is composed of five components including a main drying body (1), a drying box door (32), a box door hinge (33), a drying disc (2) and a drying disc support (3); the hot blast heater is in a cubic shape, the height is 150 cm, the width of the four edges is 90 cm, and the hot blast heater is composed of nine parts including a hot blast heater body (4), a hot blast pipe (5), an electric fan (7), an electric fan motor (6), an electric fan power line (8), a hot blast heater air control door (30), a hot blast heater hot water tank (31), a hot blast heater hot water inlet pipe (22) and the like; the gas heating device is composed of twelve parts including a gas stove (20), a gas stove hot water tank (18) and the like; the automatic temperature control instrument is composed of seven components including an automatic temperature control instrument body (12), an automatic temperature control instrument power line (11), an automatic temperature control instrument probe connecting line (14) and the like; and the movable chassis is composed of a chassis body (26) and movable wheels (27).

Description

A kind of temperature automatically controlled gas heating cabinet-type movable multi-purpose dehydrator

Technical field

A kind of temperature automatically controlled gas heating cabinet-type movable multi-purpose dehydrator of the present invention relates to agricultural machinery manufacture field, particularly relates to a kind of temperature automatically controlled gas heating cabinet-type movable multi-purpose dehydrator processing technology thereof.

Background technology

Due to China agricultural modernization just under development, level of farming mechanization has much room for improvement, agricultural production is still lived at the mercy of the elements under certain condition, particularly in agriculture and forestry fruit harvests season, once run into cloudy weather for several days running weather, will result in gathered in the crops fruit mouldy, macerate rotten, rotten, lose edible and economic worth, applicant location Hancheng City is the national maximum Pericarpium Zanthoxyli place of production, annual value of production 10-12 hundred million yuan, every year because cloudy weather for several days running weather on average causes 10-15% Pericarpium Zanthoxyli to macerate rotten going bad, cause economic loss 1-1.5 hundred million yuan, the serious time causes Pericarpium Zanthoxyli yield and economic loss to reach 30%, weight is mixed in loss, some green pepper agriculture is too deep for tears, people is even had to commit suiside lose one's life because losing huge；Applicant place Shaanxi Province Jujube, Fuping County Fructus kaki Siccus, Dali County Radix hemerocalis plicatae, Semen arachidis hypogaeae etc. are well-known throughout the country, every year because cloudy weather for several days running weather on average causes about 10-20% agriculture and forestry product fruit to macerate rotten going bad, also have the grain of some peasant plantings, vegetable, medical material etc. to have every year and cause economic loss because of cloudy weather for several days running weather, all parts of the country are just said nothing of, our company is through studying for a long period of time, a series of different energy sources, different structure, different product drying multiple types agriculture and forestry product fruit drying baker will be released, it is desirable to the solution of the problems referred to above is offered help.

Summary of the invention

It is an object of the invention to: design, make a kind of temperature automatically controlled gas heating cabinet-type movable multi-purpose dehydrator, solve mouldy because cloudy weather for several days running weather agriculture and forestry product fruit can not dry in time, macerate rotten, rotten, lose edible and economic worth situation, reduce peasant economy loss, promote the development of agricultural economy and mechanization of agriculture.

To achieve these goals, the technical scheme that the present invention formulates is: a kind of temperature automatically controlled gas heating cabinet-type movable multi-purpose dehydrator is made up of drying baker, air stove, gas heater, automatic temperature control instrument, removable underframe five part；Drying baker divides left and right two, is placed in air stove both sides, for cabinet-type drying baker；Drying baker by drying casing 1, dry chamber door 32, chamber door hinge 33, drying tray 2, drying tray support 3 five parts form；It is cube shaped for drying casing, is made up of four, front, rear, left and right boxboard；There is density board one side all vertical inwardly, inner edge length and width 90 centimetres, high 180 centimetres, wherein, left and right box plate hight 180 centimetres, wide 90 centimetres, forward and backward boxboard is high 180 centimetres, wide 98 centimetres, align with rearing-box plate both sides in left and right boxboard housing limit, connects with 0.8 centimetre of screw of diameter；Before left drying baker, boxboard is left drying chamber door, with two long 10 centimetres of hinges, is connected to the left boxboard front bezel of left drying baker from 30 centimetres of upper and lower limit；Before right drying baker, boxboard is right drying chamber door, with identical gemel connection in the right boxboard front bezel of right drying baker；Long 90 centimetres of drying tray 2, wide 90 centimetres, high 3 centimetres, screen cloth is arranged at bottom；Drying tray support 3 is long 90 centimetres, wide 3 centimetres of angle bar, there is 0.4 centimetre of circular hole of diameter at angle bar one side two ends far from centre, 2 centimetres of top, each 15 of each drying baker left and right both sides boxboard, totally 30, by 10 centimetres of downward each interval, drying baker left and right boxboard upper edge, with screw traverse angle bar circular hole, it is fixed on the boxboard of left and right both sides, being divided into 15 layers, left and right two drying bakers amount to 30 layers, 60；Air stove is cube shaped, high 150 centimetres, four hem widths 90 centimetres, are made up of hot blast body of heater 4, warm-air pipe 5, electric fan 7, fan motor 6, fan power line 8, air stove control air door 30, air stove boiler 31, air stove hot water inlet pipe 22, air stove hot water return pipe 19 9 part；High 150 centimetres, wide 90 centimetres of the forward and backward steel plate of hot blast body of heater；High 130 centimetres, wide 90 centimetres of left and right steel plate；The upper and lower steel plate length of side 90 centimetres, is divided into equal 5 lattice in front, rear, left and right, amounts to 25 lattice, has 10 centimetres of circular holes of diameter at every lattice home position；Warm-air pipe diameter 10 centimetres, is placed in the corresponding circular hole of upper and lower punched steel plate and is welded and fixed by long 100 centimetres；Air stove electric fan periphery sealing plate, for 90 centimetres of steel plates of the length of side, at 60 centimetres of circular holes of forward position cutting diameter, be placed in air stove top align with air stove four limit be connected fixing；Air stove electric fan is mounted in the sealing plate circular hole of electric fan periphery；Air stove control air door length 88 centimetres, wide 19 centimetres, control aerofoil axial length 10 centimetres, diameter 0.8 centimetre, being placed in control two ends, aerofoil one long limit to expose 1 centimetre and be welded and fixed, bottom the steel plate of front and back, corner has 0.8 centimetre of circular hole of diameter, control aerofoil axle to be through at bottom the steel plate of front and back in the circular hole of corner；Gas heater is by gas-cooker 20, appendix electromagnetic valve 26, power of electromagnetic valve line 16, heat-exchanger pump 23, boiler 18, boiler filler pipe and valve 17, hot water tank outlet and heat-exchanger pump water inlet connecting tube 25, heat-exchanger pump power line 24, air stove filler pipe 22, air stove return pipe 19, gas kitchen ranges support 21, heat-exchanger pump, gas-cooker and boiler support 27 etc. 12 part composition, automatic temperature control instrument is by instrument box 9, automatic temperature control instrument 12, automatic temperature control instrument power line 11, temperature automatically controlled instrument probe line 14, temperature automatically controlled instrument probe 13, automatic temperature control instrument control line 15, on and off switch 10 grade seven part forms；When automatic temperature-controlled instrument is installed, pick out two control lines, a power of electromagnetic valve line wherein wire is blocked, is made both threads head, be connected with two control lines of automatic temperature-controlled instrument；Removable drying baker underframe is made up of underframe 26 and movable pulley 27, and long 300 centimetres, wide 101 centimetres, in order font, four limits are made up of 4 centimetres of angle bar of the length of side, and equal 3 lattice of middle part are connected by 24 centimetres of wide steel bars, and 6 movable wheel are installed on corner, two ends and middle both sides.

The invention has the beneficial effects as follows: 1, be used that common material makes, cheap；2, gas heating, drying, non-environmental-pollution；3, the grains such as Semen Tritici aestivi, Semen Maydis, Oryza glutinosa can be dried, the oil plants such as Semen arachidis hypogaeae, Semen Sesami, Semen sojae atricolor, Semen Brassicae campestris, sunflower seed, tens kinds of agricultures, woods, pair, the medicine product such as the forest products fruits such as Pericarpium Zanthoxyli, Fructus Jujubae, Fructus kaki Siccus, Semen Castaneae, Semen Juglandis, all kinds of medical material, vegetable are drying, 4, automatic temperature control instrument is adopted to control to dry, realize unmanned management of drying, saving cost；5, adopting removable drying baker underframe, can will dry and move to suitable place easily very easily as required, this patent has significant practicality, creativeness, novelty, fills the domestic gaps, particularly suitable family, little micro-enterprise demand and purchase use.

Accompanying drawing explanation

Fig. 1 is temperature automatically controlled gas heating cabinet-type movable multi-purpose drying machine drying case front internal view, Fig. 2 is temperature automatically controlled gas heating cabinet-type movable multi-purpose dehydrator front elevation, Fig. 3 is temperature automatically controlled gas heating cabinet-type movable multi-purpose dehydrator top view, and Fig. 4 is that temperature automatically controlled gas heating cabinet-type movable multi-purpose dehydrator is along line A-A profile.

In accompanying drawing: 1 dries casing；2 drying trays；3 drying tray supports；4 hot blast bodies of heater；5 warm-air pipes；6 fan motors；7 electric fans；8 fan power lines；9 instrument boxs；10 on and off switch；11 automatic temperature control instrument power lines；12 automatic temperature control instruments；13 temperature automatically controlled instrument probes；14 temperature automatically controlled instrument probe lines；15 automatic temperature control instrument control lines；16 power of electromagnetic valve lines；17 boiler filler pipes；18 boilers；19 boiler return pipes；20 gas-cookers；21 gas-cookers and boiler support；22 air stove water inlet pipes；23 heat-exchanger pumps；24 heat-exchanger pump power lines；25 hot water tank outlets and heat-exchanger pump water inlet connecting tube；26 appendix electromagnetic valves；27 heat-exchanger pumps, gas-cooker and boiler support；28 removable drying baker underframe；29 movable wheel；30 air stove control air doors；31 air stove boilers；32 dry chamber door；33 chamber door hinges.

Detailed description of the invention

1, the design of temperature automatically controlled gas heating cabinet-type movable multi-purpose dehydrator, is shown in Figure of description.

2, raw material acquisition

Raw material acquisition is purchased by design drawing demand, component end item mainly has: gas-cooker, heat-exchanger pump, boiler, valve, water-supply-pipe, on and off switch, automatic temperature control instrument, instrument box, electric fan, screw, iron nail etc., needs rapidoprint mainly to have: 0.2-0.3 cm thick steel plate, 10 centimetres of steel pipes of diameter, angle bar, drying baker batten, drying tray batten, density board, drying tray screen cloth etc..

3, sub-unit, device processing are installed

(1), drying baker makes: drying baker by drying casing 1, dry chamber door 32, chamber door hinge 33, drying tray 2, drying tray support 3 five parts form；Drying casing space framework shape, make by batten and density board, inner edge length and width is 90 centimetres, high 180 centimetres, and four, point front, rear, left and right boxboard makes, and then combines；Wherein, left and right box plate hight 180 centimetres, wide 90 centimetres, first by 2 root length 180 centimetres, wide 4 centimetres of square wood strips, 5 root lengths 82 centimetres, wide 4 centimetres of square wood strips, equal four lattice iron nail nail joints at a right angle are divided to become flitch frame, it is that 1 centimetre of density board cutting is grown up 180 centimetres, wide 90 centimetres of specification density plates by thickness again, be placed in flitch frame one side align with flitch frame four limit, with thread tapping by the density board of cutting on flitch frame, be fabricated to a piece of boxboard, being fabricated to another sheet boxboard by the method again, left and right boxboard completes；Forward and backward boxboard is high 180 centimetres, wide 98 centimetres, first by 2 root length 180 centimetres, wide 4 centimetres of square wood strips, 5 root lengths 90 centimetres, wide 4 centimetres of square wood strips, equal four lattice iron nail nail joints at a right angle are divided to become flitch frame, it is that 1 centimetre of density board cutting is grown up 180 centimetres, wide 98 centimetres of specification density plates by thickness again, it is placed in flitch frame one side to align with flitch frame four limit, with thread tapping by the density board of cutting on flitch frame, being fabricated to a piece of boxboard, then be fabricated to another sheet boxboard by the method, forward and backward boxboard completes；Then left and right boxboard and rearing-box plate being holded up, have density board one side all inwardly, aligns with rearing-box plate both sides in left and right boxboard housing limit, stressed joint on cap nut of screwing on of boring a hole with long 12 centimetres of iron nail nail joints or punching length 12 centimetres, 0.8 centimetre of screw of diameter；Front boxboard is as drying chamber door, with two 10 centimeter length hinges, with thread tapping, hinge one side is connected to back gauge upper and lower limit 30 centimeters in face of left boxboard housing, drying chamber door is had density board one side inwardly, hinge another side being connected to the drying chamber door left side from doorframe upper and lower limit 30 centimeters, left drying baker completes；Being fabricated to right drying baker by the method, but hinge need to be gone up on the right of right drying baker, drying baker completes；nullDrying tray is also by 2 root length 90 centimetres、3 root lengths 86 centimetres，Wide 2 centimetres，High 3 centimetres of battens make，It is placed on plane operation platform by 2 90 centimetres of batten broadsides 86 centimetres of laid parallels of spacing down，It is at a right angle that other 3 86 centimetres of battens are placed between 90 centimetres of battens two ends and justified，With iron nail or thread tapping by 90 centimetres of batten two ends and middle nail joint in 86 centimetres of batten two ends，It is made drying tray frame，By the length of side 90 centimetres、0.3 centimetre of screen cloth of pitch-row is placed in above drying tray frame，By 2 root length 90 centimetres、3 root lengths 86 centimetres，Wide 2 centimetres，Thick 1 centimetre of batten，It is corresponding with drying tray frame batten to be pressed on screen cloth，With iron nail nail joint on drying tray frame，It is fabricated to 1 drying tray，30 drying trays are made altogether by the method，Each drying baker 15，Drying tray completes；Drying tray support is with long 90 centimetres, wide 3 centimetres of angle bar, at angle bar one side two ends, 0.4 centimetre of circular hole of diameter is beaten from centre, 2 centimetres of top, 60 drying tray supports are made by the method, each drying baker 30, internal left from drying baker, 15 centimetres of downward interval, upper edge, right both sides, with thread tapping traverse angle bar circular hole, enterprising drying baker is left, right both sides boxboard wooden frame tightens, angle bar is fixed on boxboard, drying baker is left, each 15 of right both sides boxboard, totally 30, it is divided into 15 layers, drying tray is placed on every layer of support, left, right two drying bakers amount to 60, totally 30 layers, drying tray rack making installation, drying baker fabrication and installation complete；

(2), air stove makes: air stove is cube shaped, high 150 centimetres, four hem widths 90 centimetres, are made up of hot blast body of heater 4, warm-air pipe 5, electric fan 7, fan motor 6, fan power line 8, air stove control air door 30, air stove boiler 31, air stove water inlet pipe 22, air stove return pipe (19) nine part；Hot blast body of heater 0.2-0.3 cm thick steel plate makes, and sheet stock is cut out 90 centimetres of two panels steel plates high 150 centimetres, wide, as the forward and backward steel plate of body of heater；Cut out 90 centimetres of two panels steel plates high 130 centimetres, wide, as the left and right steel plate of body of heater；Cut out 90 centimetres of two panels steel plates of the length of side, as the upper and lower steel plate of body of heater；Upper and lower for body of heater steel plate being respectively divided into equal 5 lattice in front, rear, left and right, amounts to 25 lattice, in every lattice home position mechanical press's punching, or revolve with machinery lathe and cut and be made 10 centimetres of circular holes of diameter, every 25 circular holes, two panels amounts to 50 circular holes；With 10 centimetres of steel pipes of raw material diameter, it is cut into 100 centimetres of steel pipes of 25 root length with cutting machine, it is made warm-air pipe, then a piece of steel plate of punching is set level on ground, take 4 warm-air pipes to be respectively placed on the circular hole of punched steel plate 4 jiaos and align, at a right angle be welded and fixed, then 4 jiaos of circular holes of another sheet punched steel plate are placed on warm-air pipe weld and align are welded and fixed, all the other warm-air pipes being respectively placed in the corresponding circular hole of upper and lower punched steel plate be welded and fixed, warm-air pipe makes welding and completes；By 90 centimetres of a piece of front springs high 150 centimetres, wide, set level on ground, the warm-air pipe welded is placed on front spring, from 30 centimetres, front spring one end as body of heater top, from the front spring other end 20 centimetres as body of heater bottom, put with long limit parallel alignment, upper and lower for warm-air pipe two ends Plate Welding is fixed on front spring, more upper and lower for warm-air pipe two ends Plate Welding is fixed on rear steel plate by the method；The warm-air pipe of welding is turned over and turn 90 degrees, the forward and backward steel plate making welding is placed in both sides, a piece of left and right steel plate is placed on warm-air pipe, align with front and back steel plate in both sides, one end from warm-air pipe one end steel plate 30 centimetres, and front spring hanging, align with warm-air pipe other end steel plate, it is welded and fixed, by the method, another sheet left and right Plate Welding is fixed；Cut out 90 centimetres of steel plates of a piece of length of side, at 60 centimetres of circular holes of home position cutting diameter, as air stove electric fan periphery sealing plate, it is placed in air stove top and aligns with air stove four limit and be welded and fixed, then air stove electric fan is mounted in the sealing plate circular hole of electric fan periphery；Cut out two root length 90 centimetres, wide 3 centimetres of angle bar are welded in left and right inferior horn bottom air stove, cut out a length of a film 88 centimetres, wide 19 centimetres of steel plates as hot bellows control aerofoil, intercept 2 segment length 10 centimetres, 0.8 centimetre of steel pole of diameter, be placed in control two ends, aerofoil one long limit expose 1 centimetre as control aerofoil axle be welded and fixed, bottom the steel plate of front and back, corner is each beats 0.8 centimetre of circular hole of diameter, being through at bottom the steel plate of front and back in the circular hole of corner by control aerofoil axle, air stove completes.

(3), gas heater is installed: gas heater is made up of gas-cooker 20, appendix electromagnetic valve 26, power of electromagnetic valve line 16, boiler 18, boiler filler pipe and valve 17, hot water tank outlet and heat-exchanger pump water inlet connecting tube 25, heat-exchanger pump 23, heat-exchanger pump power line 24, air stove water inlet pipe 22, air stove return pipe 19, gas-cooker and boiler support 21, heat-exchanger pump, gas-cooker and boiler support 270 two part, above-mentioned parts all have finished product, buy and install.

(4), automatic temperature control instrument is installed: automatic temperature control instrument is made up of seven parts such as automatic temperature control instrument 12, temperature automatically controlled instrument probe line 14, temperature automatically controlled instrument probe 13, automatic temperature control instrument control line 15, instrument box 9, automatic temperature control instrument power line 11, on and off switch 10；When temperature control instrument control line connects, being picked out from temperature controller by two the end of a thread of control line, blocked by power of electromagnetic valve line one wire, be made two the end of a thread, be connected with two the end of a thread of automatic temperature-controlled instrument control line, remaining part all has finished product, buys and installs.

(5), mobile drying baker underframe can be turned to be made up of underframe 28 and movable pulley 29, long 300 centimetres, wide 101 centimetres, in order font, four limits are made up of 4 centimetres of angle bar of the length of side, and equal 3 lattice of middle part are connected by 24 centimetres of wide steel bars, and 6 steerable wheels are installed on corner, two ends and middle both sides.

4, finished product combination is installed

Above-mentioned all parts and device are combined and installed together, temperature automatically controlled gas heating movable multi-purpose dehydrator.

5, surface treatment

After finished product combines installation, with grinding tool by dehydrator surface sharp corners, burr, projection, welding injustice place, polishing is smooth, air stove and holder part elder generation rust prevention by applying liquid material paint are dried, spray a mixed paint again, drying baker outer surface also sprays a mixed paint, sticks trade mark, label after drying.

6, finished product packing

While production, packing crates made by specification plank or batten according to product, in position sprays name of product, specifications and models, factory's name factory site, contact method etc., after being loaded by product, put case lid iron bar well and iron nail nail joint is firm, put in storage or sell.

Claims (1)

1. a temperature automatically controlled gas heating movable multi-purpose dehydrator, is characterized in that: be made up of drying baker, air stove, gas heater, automatic temperature control instrument, removable underframe five part；Drying baker divides left and right two, is placed in air stove both sides, for cabinet-type drying baker；Drying baker by drying casing 1, dry chamber door 32, chamber door hinge 33, drying tray 2, drying tray support 3 five parts form；It is cube shaped for drying casing, is made up of four, front, rear, left and right boxboard；There is density board one side all vertical inwardly, inner edge length and width 90 centimetres, high 180 centimetres, wherein, left and right box plate hight 180 centimetres, wide 90 centimetres, forward and backward boxboard is high 180 centimetres, wide 98 centimetres, align with rearing-box plate both sides in left and right boxboard housing limit, connects with 0.8 centimetre of screw of diameter；Before left drying baker, boxboard is left drying chamber door, with two long 10 centimetres of hinges, is connected to the left boxboard front bezel of left drying baker from 30 centimetres of upper and lower limit；Before right drying baker, boxboard is right drying chamber door, with identical gemel connection in the right boxboard front bezel of right drying baker；Long 90 centimetres of drying tray 2, wide 90 centimetres, high 3 centimetres, screen cloth is arranged at bottom；Drying tray support 3 is long 90 centimetres, wide 3 centimetres of angle bar, there is 0.4 centimetre of circular hole of diameter at angle bar one side two ends far from centre, 2 centimetres of top, each 15 of each drying baker left and right both sides boxboard, totally 30, by 10 centimetres of downward each interval, drying baker left and right boxboard upper edge, with screw traverse angle bar circular hole, it is fixed on the boxboard of left and right both sides, being divided into 15 layers, left and right two drying bakers amount to 30 layers, 60；Air stove is cube shaped, high 150 centimetres, four hem widths 90 centimetres, are made up of hot blast body of heater 4, warm-air pipe 5, electric fan 7, fan motor 6, fan power line 8, air stove control air door 30, air stove boiler 31, air stove hot water inlet pipe 22, air stove hot water return pipe 19 9 part；High 150 centimetres, wide 90 centimetres of the forward and backward steel plate of hot blast body of heater；High 130 centimetres, wide 90 centimetres of left and right steel plate；The upper and lower steel plate length of side 90 centimetres, is divided into equal 5 lattice in front, rear, left and right, amounts to 25 lattice, has 10 centimetres of circular holes of diameter at every lattice home position；Warm-air pipe diameter 10 centimetres, is placed in the corresponding circular hole of upper and lower punched steel plate and is welded and fixed by long 100 centimetres；Air stove electric fan periphery sealing plate, for 90 centimetres of steel plates of the length of side, at 60 centimetres of circular holes of forward position cutting diameter, be placed in air stove top align with air stove four limit be connected fixing；Air stove electric fan is mounted in the sealing plate circular hole of electric fan periphery；Air stove control air door length 88 centimetres, wide 19 centimetres, control aerofoil axial length 10 centimetres, diameter 0.8 centimetre, being placed in control two ends, aerofoil one long limit to expose 1 centimetre and be welded and fixed, bottom the steel plate of front and back, corner has 0.8 centimetre of circular hole of diameter, control aerofoil axle to be through at bottom the steel plate of front and back in the circular hole of corner；Gas heater is by gas-cooker 20, appendix electromagnetic valve 26, power of electromagnetic valve line 16, heat-exchanger pump 23, boiler 18, boiler filler pipe and valve 17, hot water tank outlet and heat-exchanger pump water inlet connecting tube 25, heat-exchanger pump power line 24, air stove filler pipe 22, air stove return pipe 19, gas kitchen ranges support 21, heat-exchanger pump, gas-cooker and boiler support 27 etc. 12 part composition, automatic temperature control instrument is by instrument box 9, automatic temperature control instrument 12, automatic temperature control instrument power line 11, temperature automatically controlled instrument probe line 14, temperature automatically controlled instrument probe 13, automatic temperature control instrument control line 15, on and off switch 10 grade seven part forms；When automatic temperature-controlled instrument is installed, pick out two control lines, a power of electromagnetic valve line wherein wire is blocked, is made both threads head, be connected with two control lines of automatic temperature-controlled instrument；Removable drying baker underframe is made up of underframe 26 and movable pulley 27, and long 300 centimetres, wide 101 centimetres, in order font, four limits are made up of 4 centimetres of angle bar of the length of side, and equal 3 lattice of middle part are connected by 24 centimetres of wide steel bars, and 6 movable wheel are installed on corner, two ends and middle both sides.