WO2016123902A1

WO2016123902A1 - Calculating method for maximum decoration weight of lift car

Info

Publication number: WO2016123902A1
Application number: PCT/CN2015/083841
Authority: WO
Inventors: 魏科; 鲁江; 魏晓波; 葛余林; 阮彦; 范林玉
Original assignee: 江苏蒙哥马利电梯有限公司
Priority date: 2015-02-05
Filing date: 2015-07-13
Publication date: 2016-08-11
Also published as: CN104609282A

Abstract

Disclosed is a calculating method for maximum decoration weight of a lift car. The critical values of the dead weight of the lift car are calculated respectively from three aspects, namely the safety coefficient of a traction steel wire rope, the allowable radial load of a main shaft of a tractor and the allowable torque of a main machine or the allowable brake torque of a brake; the minimum value of the critical values of the dead weight of the lift car calculated from the three aspects is selected as the allowable maximum dead weight of the lift car; the maximum decoration weight of the lift car is calculated from a difference between the allowable maximum dead weight of the lift car and the actual dead weight of the lift car. By means of the calculating of the allowable maximum decoration weight of the lift car, the calculating method assures that the implementation of the decoration weight can be carried out to the maximum extent while normal operation of a lift is guaranteed, thus ensuring safety service lives of main components of the lift, and improving the maximum publicity effect and benefit of a business enterprise.

Description

Method for calculating maximum decoration weight of elevator car

Technical field

The invention belongs to the technical field of elevator production, and particularly relates to a calculation method for the maximum decoration weight of an elevator car.

Background technique

With the advancement of society, the elevator users' decoration of the car is also advancing with the times, and the weight of the decoration is also increasing. However, as the important part of the elevator traction system, the car can increase its own weight without limit. The answer is yes. : No. Since it is not possible to increase without limit, when the weight of the car decoration is the end, it becomes a problem that the elevator manufacturer and the inspection unit must consider.

An elevator product, which allows the car decorated maximum weight P _{max means} that the car should be equal to the maximum allowable weight of the car and the actual P _max _allowed _real difference between the weight P:

Namely: P _{installed max} = P to _{allow max -} P _real ..........................(1)

For product elevators whose traction system parameters have been determined, the actual weight of the car should meet the elevator traction conditions and be within the maximum self-weight range allowed by the car, otherwise the service life of the elevator and its related components will be shortened. Therefore, the reasonableness of the maximum self-weight allowed by the car will involve the quality of the elevator users, which will involve the social reputation of the elevator manufacturer, and will also involve the social reputation of the statutory inspection unit. Therefore, how to determine the maximum allowable weight of the car is an important concern for elevator manufacturers, especially statutory inspection units.

The self-weight of the elevator car mainly depends on the following factors: 1 the safety factor of the traction wire rope; 2 the maximum allowable radial load of the traction machine main shaft; the maximum allowable torque of the gearbox or the gearless main engine or the maximum brake system. Dynamic torque. According to each influencing factor, a critical value P _{max of the} car's own weight can be found. The safety factor of the traction wire rope, the radial allowable load of the traction machine main shaft, the allowable torque of the traction machine output shaft or the allowable braking torque of the brake are respectively expressed as the self-weight threshold value P of each factor. The function of _max can be solved under the given other conditions, and the car self-weight threshold value P _max under each influencing factor. If the car's own weight exceeds a certain critical value, the life of the traction wire rope, or the life of the traction machine main shaft, the life of the gearbox or the gearless main engine may not be guaranteed, or the brake may not stop the car, or cause The motor and inverter are overloaded and burned. Therefore, the above-described threshold selecting the minimum value as the maximum value P _max P _{max allowed} weight of the car, as long as the actual elevator car in any case not greater than the weight P _{max allowed,} can make the drive device each of said parts are It is safe and longevity. The selected P _max and _allow the weight of car P actual _real into equation (1) _means P _max can be determined.

Summary of the invention

OBJECT OF THE INVENTION: The present invention provides a calculation method for calculating the maximum decoration weight to the maximum extent under the premise of ensuring the safe operation of the elevator.

Technical Solution: The method for calculating the maximum decoration weight of an elevator car according to the present invention includes the following steps:

(1) Calculate the maximum decoration weight of the car. The car P is _{installed as Max} , as shown in the following formula 1:

P _{installed max} = P to _{allow max -} P _real (1)

Wherein P _max is the _fitted decorated car allowed maximum weight, the maximum P _max is the _allowed permitted weight of the car, car P is the actual weight of _{the solid;}

(2) the maximum allowable weight of the car P _{max allowed} values: Select the minimum car weight threshold value P _max is the _max _allowed as the value of P;

(3) Calculate the car's own weight threshold P _max : calculated from the safety factor of the traction wire rope, the allowable radial load of the traction machine spindle, and the allowable torque of the main engine or the allowable braking torque of the brake. Car weight threshold P _max ;

(4) Select the minimum value from the car self-weight threshold value P _max obtained in step (3) as the maximum allowable self-weight P- _max of the car, and bring in the formula 1 to obtain the final car maximum decoration weight car. P _{installed max} .

As an optimization step (3) calculating the safety factor of the hoisting rope from the formula P _max as follows:

Derive

Where S is the actual value of the safety factor of the suspension rope of a given traction system, T is the minimum breaking force of the rope, n is the number of ropes, m is the traction ratio, Q is the rated load, H is the lifting speed, q is the unit the length of the hoisting rope by weight, g _n is the gravitational acceleration; wherein the safety factor according to the principle of checking the hoisting rope, S≥S _f ≥S _m herein may be in the minimum value of S is S _f, S = S _f will be substituted into the formula 2, S _f is the calculated safety factor of the wire rope of a given traction system obtained by considering the shape of the rope of the traction sheave, the number of pulleys and the bending condition; S _m is the drag specified in clause 9.2.2 of GB7588-2003 The minimum safety factor for the wire rope is allowed.

As an optimization, the allowable radial load calculation P _max formula of the traction machine main shaft described in the step (3) is as follows:

A _max = (P _max + 1.25Q + W + W ₁ + W ₂ ) / m,

Deduced that P _max = mA _max -1.25Q-W-W ₁ -W ₂ (3)

Where A _max is the radial maximum static load of the main shaft, m is the traction ratio, Q is the rated load, W is the counterweight, W ₁ is the weight of the traction rope, and W ₂ is the weight of the compensation chain.

As an optimization step (3) the host allowable allowable brake torque or braking torque calculating P _max following formula:

Derivation

Where M _max is the brake allowable braking torque, m is the traction ratio, D is the D _t in the example—the traction wheel pitch circle diameter, g _n is the gravity acceleration, η is the total mechanical transmission efficiency, and Q is the rated Load capacity, W is the counterweight, W ₁ is the weight of the traction wire rope, and W ₂ is the weight of the compensation chain.

As an optimization, the formula for calculating the counterweight W is W=P _real +KQ, where P _is the car's own weight, K is the elevator balance coefficient, Q is the rated load; W ₁ =Hn ₁ mq ₁ , Medium H is the lifting speed, n ₁ is the wire rope coefficient, m is the traction ratio, q ₁ is the weight of the wire rope per unit length; W ₂ =Hn ₂ q ₂ , where H is the lifting speed, n ₂ is the number of compensation chains, q ₂ is the unit length compensation chain weight.

Advantageous Effects: The invention allows the maximum decorative weight of the car to be calculated, thereby ensuring the normal operation of the elevator and maximizing the implementation of the decoration weight, thereby ensuring the safety and longevity of the main components of the elevator, and at the same time improving the enterprise's Maximize the effectiveness of publicity and improve business efficiency.

detailed description

The present invention will be further described below in conjunction with a specific elevator operating embodiment:

Example 1

The parameters of a ladder traction system are as follows:

1 Calculate the critical value P _{max of the} car's own weight from the safety factor of the elevator traction wire rope:

First calculate the value of S _f :

In the formula:

Nequiv=Nequiv(t)+Nequiv(p)

With a slit semicircular groove cut angle β = 105 ° check GB7588-2003 Appendix N Table N ₁ to:

Nequiv(t)=15.2

Nequiv(p)=K _P (N _PS +4N _Pr )

There are no pulleys in the traction system that cause reverse bending, N _Pr =0, N _PS = 2

Nequiv(p)=k _p (N _PS +4N _Pr )=2.25×(2+4×0)=4.5

Nequiv=Nequiv(t)+Nequiv(p)=15.2+4.5=19.7

will

Nequiv=19.7 is substituted into (5): S _f = 17.29 and then substituted into (2):

Here, S = S _f = 17.29; q = q ₁ = 0.347 kg / m;

(Note: The surface pressure of the elevator traction rope groove does not reflect the traction capacity, and it does not reflect the life. The GB7588-2003 standard does not require it, and is exempt from this calculation.)

2 Calculate the critical value P _{max of the} car's own weight from the allowable load of the traction machine main shaft.

A _max = 3500kg, m = 2, Q = 1000kg, K = 48, W ₁ = 470kg, W ₂ = 432kg, substituted into formula (3):

P _max =mA _max -1.25Q-W-W ₁ -W ₂

=2×3500-1250-2030-470-432=2818kg

3 Calculate the car's own weight threshold P _max from the allowable torque of the main engine shaft or the allowable braking torque of the brake (take the brake braking torque as an example)

The maximum braking torque of a set of components of the brakes of the main engine is 940Nm, which is obtained by substituting (4):

Fourth, calculate the maximum weight of the car allowed to decorate the P _{installed max}

Calculated from three or more maximum values for the car weight 2165kg, 2818kg, 1663kg, which allows the car to the minimum weight as a maximum value, i.e., selecting: P _{allowed max} = _1663kg, will _allow P _max = _1663kg, P _real = 1550kg substitution type (1), get P _{installed max} = P to _{allow max -} P _real = 1663-1550 = 113kg, P _{installed max} = 113kg. That is, the maximum weight of the elevator car allowed is 113kg.

The calculation example tells us that the decoration weight of the elevator car is limited. Therefore, the elevator manufacturer should make appropriate restrictions according to the maximum weight of the decoration allowed by the elevator car during the sales process, and cannot blindly promise the weight of the decoration required by the customer. The elevator inspection unit should also consider the weight of the elevator decoration of the unit under inspection during the inspection process, in order to ensure the safety and longevity of the elevator and its parts and components.

Claims

A method for calculating the maximum decoration weight of an elevator car is characterized in that it comprises the following steps:

(1) Calculate the maximum decoration weight of the car. The car P is installed as Max , as shown in the following formula 1:

P installed max = P to allow max - P real (1)

Wherein P max is the fitted decorated car allowed maximum weight, the maximum P max is the allowed permitted weight of the car, car P is the actual weight of the solid;

(2) the maximum allowable weight of the car P max allowed values: Select the minimum car weight threshold value P max is the max allowed as the value of P;

(3) Calculate the car's own weight threshold P max : calculated from the safety factor of the traction wire rope, the allowable radial load of the traction machine spindle, and the allowable torque of the main engine or the allowable braking torque of the brake. Car weight threshold P max ;

(4) Select the minimum value from the car self-weight threshold value P max obtained in step (3) as the maximum allowable self-weight P- max of the car, and bring in the formula 1 to obtain the final car maximum decoration weight car. P installed max .
According to an elevator car maximum calculated weight of the decoration to claim 1, wherein: step (3) calculating the safety factor of the hoisting rope from the formula P max as follows:

Derive

Where S is the actual value of the safety factor of the suspension rope of a given traction system, T is the minimum breaking force of the rope, n is the number of ropes, m is the traction ratio, Q is the rated load, H is the lifting speed, q is the unit the length of the hoisting rope by weight, g n is the gravitational acceleration; wherein the safety factor according to the principle of checking the hoisting rope, S≥S f ≥S m herein may be in the minimum value of S is S f, S = S f will be substituted into the formula 2, S f is the calculated safety factor of the wire rope of a given traction system obtained by considering the shape of the rope of the traction sheave, the number of pulleys and the bending condition; S m is the drag specified in clause 9.2.2 of GB7588-2003 The minimum safety factor for the wire rope is allowed.
The method of calculating the maximum weight of one decor of the elevator car as claimed in claim 1, wherein: step (3) of the hoisting machine spindle permissible radial load P max is calculated using the following formula:

A max = (P max + 1.25Q + W + W 1 + W 2 ) / m,

Deduced that P max = mA max -1.25Q-W-W 1 -W 2 (3)

Where A max is the radial maximum static load of the main shaft, m is the traction ratio, Q is the rated load, W is the counterweight, W 1 is the weight of the traction rope, and W 2 is the weight of the compensation chain.
The method of calculating the maximum weight of one decor of the elevator car as claimed in claim 1, wherein: step (3) of the host or from the allowable rotation allowable brake braking torque calculating the following formula P max:

Derivation

Where M max is the brake allowable braking torque, m is the traction ratio, D is the traction wheel pitch circle diameter, g n is the gravity acceleration, η is the total mechanical transmission efficiency, Q is the rated load, W is the pair Heavy weight, W 1 is the weight of the traction wire rope, and W 2 is the weight of the compensation chain.
The method for calculating the maximum decoration weight of an elevator car according to claim 3 or 4, characterized in that: the calculation formula of the counterweight W is W=P real+KQ, where P is the weight of the car. K is the elevator balance coefficient, Q is the rated load; W1=Hn1mq1, where H is the lifting speed, n1 is the wire rope coefficient, m is the traction ratio, q1 is the weight per unit length of the wire rope; W2=Hn2q2, where H is Increase the speed, n2 is the number of compensation chains, and q2 is the weight of the compensation chain per unit length.