煤礦井下單軌吊車(chē)的選型計(jì)算外文文獻(xiàn)翻譯、中英文翻譯、外文翻譯,煤礦,井下,單軌,吊車(chē),選型,計(jì)算,外文,文獻(xiàn),翻譯,中英文
Selection calculation of the monorail hoist in coal mine
ZHUANG Yan
Abstract：This paper introduces the applicable conditions and the selection calculation of the monorail hoist
briefly, and pointe out its application characteristics. This provides the reasonable selection of the monorail
hoist with the necessary theoretical basis.
Keywords：monorail hoist; applicable condition; computing method; characteristics
Monorail crane is used in coal mine, especially in mining area up, down and down the mountain. Auxiliary equipment for transporting materials, equipment and personnel in working face drift. One of the preparations. Monorail crane can be divided into steel wire according to different traction modes. Rope traction and locomotive traction can be divided into two categories, and locomotive traction mode can be divided into two categories. There are two types of locomotive traction: explosion-proof clean diesel locomotive and battery locomotive. General information. The monorail crane trains for material, equipment and personnel transportation are composed of 3. When transporting heavy equipment, only one group consists of two groups. The load-bearing vehicle for lifting the composite beam.
1 applicable conditions of monorail crane
(1) Monorail crane is hanging on the roadway roof or support to transport negative load. It is not affected by floor deformation (floor heave) and material accumulation in roadway. A reliable hanging bearing device is required. Hanging on arched or trapezoidal steel support. When the support is mounted on the scaffold, it shall be reinforced with braces. When the anchor rod is used for suspension, each hanger shall be used. Two bolts with anchoring force of more than 60 kn shall be used for rail point. Roadway fault. The surface should be greater than or equal to 7 m2.
(2) It can be used for horizontal and inclined roadway transportation. For inclined roadway. When transportation, the locomotive traction monorail crane, gradient ≤ 18 degrees, the best use. The slope is less than 12 degrees (the maximum is 40 degrees in foreign countries). Rope traction monorail crane gradient ≤25 ° and 45 ° in foreign countries. The maximum single piece transport mass is 12-15t. The minimum horizontal radius of curvature is 4 M.
(3) Locomotive traction monorail crane has the characteristics of mobility and flexibility. Each locomotive can realize the transportation of materials, equipment and personnel in multiple branch roadways. Transportation, can not be reprinted, not limited by the distance. Monorail with rope traction. The crane needs to install a large number of rope pulleys on the curve, and can not enter the branch. The transportation distance is generally 1-2 km, and the maximum is not more than 3 km. Because of luck Long distance, train running resistance, traction rope resistance, track and support. The bearing capacity of the monorail, the guide wire rope and the. The tension of wire rope will tend to be complicated.
(4) There is a small amount of pollution and difference in the exhaust gas of diesel monorail crane. Therefore, the use of roadway should have enough air volume to dilute harmful gas. Body, so as to achieve the degree of non-destructive health.
(5) The biggest advantage of battery monorail crane is no air pollution. However, limited by the storage capacity of the battery, the battery monorail crane is difficult to operate. It is suitable for low traction and ventilation. Poor tunnelling for transporting materials and personnel.
2 selection calculation of monorail crane
The main content of monorail crane selection calculation includes the selection of monorail crane. The type of winch, the calculation of the actual traction force, the choice of winch or diesel. Calculation of daily transportation capacity of single monorail crane and determination of mining area. Or the number of monorail cranes required by the whole mine.
2.1 selection of monorail crane type
(1) The necessary known conditions for monorail crane calculation are: ① transportation distance. The results show that: 1) the distance between the running track and the running track; 2) the gradient of the running tunnel; 3) whether the running track has branches; 4) the distance between the running track and the running track. The maximum mass of the single piece to be transported;5）whether to transport personnel.
(2) According to the known conditions and the applicability of the above monorail cranes. Around, choose wire rope traction monorail crane or diesel monorail crane (also Explosion proof special type battery monorail crane can be selected.)
2.2 calculation of traction and power of monorail crane
In order to calculate the traction force of monorail crane, the monorail crane must be determined first. The single maximum transportation volume of the vehicle, that is, the production volume served by the monorail crane is calculated. Point to material and equipment requirements. The calculation should be based on the quality of the material. The weight of each transport unit is 3 T, That is: 1) the transportation volume of each container is 2.5 T, and 3.5 t without container t. (2) materials less than 3.1 m in length are transported in containers, and those more than 3.1 m in length are transported in containers .M.General Monorail.
Generally, the monorail crane only hangs 3-4 lifting beams at a time, that is to transport one beam. Each train can only transport 3-4 tons of materials, equipment and personnel each time. Transportation unit (or 3-4 people vehicles); transport large equipment such as hydraulic support. When erecting, the monorail crane can only hang one combined lifting beam. Monorail hanging train. The total mass of the vehicle is g, and the payload is Q. according to the above three conditions, the. The maximum value of (Q + G) is taken to calculate the traction force.
(1) Calculation of traction force
F＝(Q+G)g /1000η B (μcos α+g sin α) (1)
Where: F is the traction force of monorail crane, kn; G is the total mass of monorail Quantity, kg; q is the payload, kg; μ is the running resistance of monorail crane. Coefficient, μ = 0.3; α is roadway dip angle, (°); η B is line efficiency, When the line is a straight line, η B = 0.8, and η b decreases by 0.01 for every 15 ° increase in horizontal curve.
The traction force of winch or diesel locomotive is selected according to f value, and the latter needs to be adjusted, Slightly larger than the former.
(2) Calculation of motor power. The shaft power n of traction winch can be calculated according to the following formula
N＝ F v/η A (2)
Where: V is the running speed, v = 2 m / S; η A is the driving device efficiency
75. According to the n value, select the motor capacity n standard, n standard ≥ n.
2.3 selection calculation of wire rope for monorail crane with wire rope traction
The traction winch of monorail crane is hydraulic friction winch with steel wire rope Closed loop.
Its transmission principle is friction transmission, and the tension on both sides of the large friction wheel is FY And FL. The relationship between the two can be expressed by Euler's formula, that is
F y＝Fl eμα (3)
Where: FY Is the tension at the point where the wire rope meets the friction wheel, kn; fl by. Tension at the separation point of wire rope and friction wheel, kn; μ is the tension between wire rope and friction wheel. Friction factor between wheels, μ = 0.1; α is the friction factor of wire rope on friction wheel. The envelop angle is α = 5 and π = 900 degrees.
(1) Tension calculation of wire rope at winch separation point
Because f = FY - FL = fl
(E μ α - 1), so the wire rope is in the winch. The minimum tension fl min at the separation point of the friction wheel can be calculated by the following formula
Fl min＝ F/ (eμα -1)n (4)
Where: n is the friction reserve coefficient, n = 1.15-1.2.
(2) Calculation of breaking force of wire rope. The breaking force FB of wire rope can be calculated according to the following formula
FB＝ Q+G ─── 1 000 g ma sin α 。 (5)
Where: Ma For the safety factor of wire rope, transportation of general materials and hydraulic support Frame time MA= 6.5, when transporting personnel＝7.5。
First, according to formula (5), calculate the damage of steel wire rope when transporting general materials. Breaking force FB1, breaking force FB2 of steel wire rope when transporting personnel and transportation fluid. When the support is pressed, the breaking force of steel wire rope is fb3.Compare FB1, FB2 and fb3, and take the maximum value as f b max,According to σ B and f b max, the standard values of breaking force FB and FB are selected>F b max, the diameter D of wire rope can be found out by FB standard.
2.4 calculation of transportation capacity of monorail crane
To calculate the transportation capacity of a single monorail crane, the first thing is to calculate the capacity. Daily transportation of materials and equipment for each production point served by monorail crane. The total number of transport units is set as a; the transport unit transported by monorail crane each time. Number, set to B. It is known that the transportation distance is l, the running speed is V, and the transportation speed is v. The calculation method of transportation capacity is as follows.
(1) Calculation of transportation capacity of monorail crane with wire rope traction. The monorail crane can not be transported on the line with branch due to the wire rope traction. So its transportation distance L is a fixed value.
① The time required for one cycle of monorail crane operation T1 = 2L /0.75 × 60 × V + θ. (6)
Where: l is the transportation distance, m; V is the running speed, M / S; 0.75. In order to consider the acceleration, deceleration and the reduction of turning speed, θ is the loading and unloading coefficient. And rest time, θ = 10-15 min.
② Daily working cycle number Z1 of monorail crane (take integer)
Z1＝ t R /(t─1). (7)
Where: Z1. Is the number of working cycles per day of monorail crane; TR is the number of working cycles per day of monorail crane. The working hours of the car are two shifts a day, and each shift works 5-7 hours h. The lower limit is taken for mining area transportation and the upper limit is taken for roadway and ground transportation.
③ The number of cycles the monorail crane should run to complete the calculation task Z2 (take integer)
Z2＝1.2/(B─A). (8)
Where: A is the sum of daily transportation units of each production operation point; B is the sum of daily transportation units The number of transportation units transported by monorail crane each time; 1.2 is the spare capacity system Count.
If Z1>Z2. It shows that the transportation capacity of monorail crane meets the requirements. On the contrary, other types of transportation equipment should be selected.
(2) Calculation of transportation capacity of diesel monorail crane
For the monorail crane with diesel engine, it can be used in the line with branch. The transportation distance of each production operation is different, so in the calculation sheet. Time T1 for one cycle of rail crane operation L in equation (6) According to the weighted average distance Li. Substituting into the calculation.There are n production operation points, and each production operation point needs daily transportation. The units are A1 and A2 respectively，… ，An. Transportation distance of each production point. The distance is L1 and L2 respectively，… ，Ln. Then the weighted average distance Li by
Li＝ L1A1+L2A2+… +Ln An /(A1+A2+… +An). (9)
Number of working cycles Z1And Z2 Calculation of single track crane with wire rope traction. The calculation of the car is the same. If Z1>Z2. It can be filled with one diesel locomotive. If Z1
FB max，由 FB標(biāo) 可查出鋼絲繩直徑 d。
2.4 單軌吊車(chē)運(yùn)輸能力的計(jì)算
要計(jì)算單臺(tái)單軌吊車(chē)的運(yùn)輸能力，首先要計(jì)算單軌吊車(chē)所服務(wù)的各生產(chǎn)作業(yè)點(diǎn)日需材料和設(shè)備的運(yùn)輸單元總和，設(shè)為 A；單軌吊車(chē)每次運(yùn)送的運(yùn)輸單元數(shù)，設(shè)為 B。已知運(yùn)輸距離為 L，運(yùn)行速度為 v，運(yùn)輸能力的計(jì)算方法如下。
(1) 鋼絲繩牽引單軌吊車(chē)運(yùn)輸能力的計(jì)算
由于鋼絲繩牽引單軌吊車(chē)不能在有分支的線路運(yùn)輸，所以它的運(yùn)輸距離L 是定值。
① 單軌吊車(chē)運(yùn)行 1 個(gè)循環(huán)所需的時(shí)間 t1
t1＝ 2L/ 0.75×60×v +θ 。 (6)
式中：L 為運(yùn)輸距離，m；v 為運(yùn)行速度，m/ s；0.75為考慮加、減速和轉(zhuǎn)彎處速度降低的系數(shù)；θ 為裝卸及休止時(shí)間，θ＝10～15 min。
② 單軌吊車(chē)日工作循環(huán)數(shù) Z1 (取整數(shù))
Z1＝ t R/(t─1) 。 (7)
式中：Z1 為單軌吊車(chē)每天工作循環(huán)次數(shù)；t R 為單軌吊車(chē)每天工作時(shí)間，一天按兩班運(yùn)輸，每班工作 5～7h，采區(qū)運(yùn)輸取下限，大巷及地面運(yùn)輸取上限值。
③ 要完成計(jì)算任務(wù)，單軌吊車(chē)應(yīng)運(yùn)行的循環(huán)數(shù)Z2 (取整數(shù))
Z2＝1.2/(B─A )。 (8)
式中：A 為各生產(chǎn)作業(yè)點(diǎn)日需運(yùn)輸單元總和；B 為單軌吊車(chē)每次運(yùn)送的運(yùn)輸單元數(shù)；1.2 為備用能力系數(shù)。如果 Z1 >Z2 ，說(shuō)明單軌吊車(chē)的運(yùn)輸能力滿足要
求，反之需另選其他類(lèi)型的運(yùn)輸設(shè)備。
(2) 柴油機(jī)單軌吊車(chē)運(yùn)輸能力的計(jì)算
對(duì)于柴油機(jī)單軌吊車(chē)，由于可以在有分支的線路上運(yùn)輸，各生產(chǎn)作業(yè)的運(yùn)輸距離不同，所以在計(jì)算單軌吊車(chē)運(yùn)行一個(gè)循環(huán)所需的時(shí)間 t1 時(shí)，式 (6) 中的 L
需要按加權(quán)平均距離 Li 代入計(jì)算。設(shè)有 n 個(gè)生產(chǎn)作業(yè)點(diǎn)，每個(gè)生產(chǎn)作業(yè)點(diǎn)日需運(yùn)輸單元分別為 A1，A2 ，…，An ；各生產(chǎn)作業(yè)點(diǎn)的運(yùn)輸距離分別為 L1L2 ，…，Ln ；則加權(quán)平均距離 Li 為
Li＝ L1A1+L2A2+…+Ln An/(A1+A2+…+An) 。 (9)
工作循環(huán)數(shù) Z1 及 Z2 的計(jì)算與鋼絲繩牽引單軌吊車(chē)的計(jì)算相同。如果Z1 >Z2 ，用 1 臺(tái)柴油機(jī)車(chē)即可滿足要求；如果 Z1
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