Weak current College】 【traction elevator shafts top spacing on the buffer distance requirements --- Power By】 【China power house network.

Summary: this article under GB7588-2003 section 5.7.1, 5.7.1.1 on traction drive space at the top of the elevator shaft road, on the first GB10060-1993 4.5.1 "buffer top surface and the distance between the hit plate" provisions of the discussion, concluded in 1993 standard GB10060-on weighing and buffer distance setting range does not meet the elevator in various rated speeds are security requirements.

To prevent traction lifts in cabin up running in speeding, leading to the elevator recoil, in the elevator, both settings are: upper station forced deceleration switch, limit bit protection switch, limit protection switch, uplink overspeed protection device, the buffer as a security device, etc. Among them, the CAP bits protection switch and ultimate protection switches are on is through the brake to achieve protection of the safety of elevators. When the elevator car stood at the top level position brake failure, on heavy weight is greater than the weight of the car, the car rolling up the elevator will occur, then the osteotome accident GB10060-1993 the elevator installation acceptance of 4.5.1 "when the cabin stood at the top level position, for energy storage buffer, the buffer with the top and the distance between the hit plate should be 200mm ~ 350mm, for energy-buffer, this distance should be 150mm ~ 400mm". The provisions on weight and buffer distance can meet GB7588-2003 the elevator manufacturing and installation of the security specifications, 5.7.1, 5.7.1.1 of elevator shaft road can guarantee top spacing, cabin and passenger safety? is the analysis of justification.

According to the 2003 GB7588-elevator manufacturing and installation of the security code 5.7.1, 5.7.1.1 stipulates: "traction lifts of wells road top spacing should meet the following requirements, when the full pressure in its buffer, should meet the following four conditions:

A), cabin guide length should be able to provide further guidance should not be less than;

B), the car top highest area of the horizontal plane, and is located in the cabin ceiling projection part well road minimum part of the horizontal and vertical distance between the freedom should not be less than;

1), seated in the cabin on top of the equipment of the highest part of the vertical distance between the freedom should not be less than;

2), boots or wheel, DRAY attachments and vertical sliding door beams or part of the highest part of the vertical distance between the freedom should not be less than;

D), above the cabin should have enough space, the space to accommodate a not less than 0.50m×0.60m×0.80m cuboid prevail ….

Note: Express corresponds to 115% of the rated speed of gravity when V-stop distance of 1/2, namely: 1/2 × [(1.15V) 2, rounded to. ”

It can be seen at the top of the elevator pitch is well road to heavy to 115% V (V: elevator rated speed) collision bumpers as calculation basis, so on to exceed 115% V speed collision bumpers, actual gravity system stop distance of 1/2 will be greater than that based on the standard design of GB7588-2003 Wells road top spacing will not be able to guarantee that car and passenger safety.

It can be concluded that, with different rated speed elevators, on free fall to the speed of up to 115% v on fall distance h, as shown in table 1 (speed listed in the table are: 0.50m/s, 0.63m/s, 1.00m/s, 1.60m/s, 1.75m/s, 2.00m/s, 2.5m/s).

Note: GB10060-1993 the elevator installation acceptance Act applies to the rated speed is not greater than 2.5m/s passenger elevator, the freight elevator.

You can see that the rated speed: 0.50m/s, 0.63m/s, 1.00m/s, the fall distance: 17mm ~ 68mm; rated speed: 1.60m/s, 1.75m/s, 2.00m/s, 2.5m/s, the fall distance: 173mm ~ 422mm. GB7588-2003 section 10.3.3, 10.3.5 stipulates: "energy storage buffer (including linear and nonlinear) can only be used for the rated speed is less than or equal to the elevator 1m/s. Energy-buffer can be used for any rated speed elevator ". Visible rated speed: 0.5m/s ~ 1.00m/s, whatever energy storage buffers or dissipation of buffer, the buffer distance: 200mm ~ 350mm and 150mm ~ 400mm, elevators are not secure.

If the buffer distance GB10060-1993 asked met, can guarantee when the fall from the lowest point, TMAS speed not exceeding 115% V?

Table 2 lists when the fall height of 200mm 150mm, respectively, when 400mm 350mm, speed, and,.

Table 2 on heavy fall height of 200mm 150mm, respectively, when 350mm, 400mm speed

From table 2 and table 3 can be seen when the fall height: 150mm, rated speed: 0.5m/s ~ 1.00m/s = 1.71 ~ 3.42; when the fall height of 200mm, rated speed: 0.5m/s ~ 1.60m/s, = 1.24 ~ 3.96; when the fall height 350mm, rated speed: 0.5m/s ~ 2.00m/s, = 1.31 ~ 5.24; when the fall height 400mm, rated speed: 0.5m/s ~ 2.00m/s = 1.40 ~ 5.60, are greater than 1.15, these situations are the elevator is not secure.

(A) when the elevator the rated speed for 2.50m/s, theBuffer distance: 150mm ≤ S ≤ 400mm, on heavy TMAS to 68 per cent V-112% V, less than 115% V, GB7588-2003 in the space between the top of the elevator shaft road is safe.

(2) Elevator rated speed respectively 1.60m/s, 1.75m/s, 2.00m/s, the buffer distance: 150mm ~ 270mm, 150mm ~ 207mm, 150mm ~ 173mm GB7588-2003 when, in the space between the top of the elevator shaft road is secure, however, when the buffer distance respectively 270mm ~ 400mm, 207mm ~ 400mm, 173mm ~ 400mm, on heavy TMAS speed of 115 per cent respectively V ~ 140% V, 115 V ~ 160 per cent V, 115 V ~ 175 per cent V, are much more than 115% V, GB7588-2003 in the space between the top of the elevator shaft road.

(3) when the elevator rated speed respectively 0.50m/s, 0.63m/s, 1.00m/s, the buffer distance: 150mm ≤ S ≤ 400mm or 200mm ≤ S ≤ 350mm, on the speed of heavy impact bumpers were 171% V ~ 280% V, 271% V ~ 444% V, 342% V ~ 560% V or 198% V ~ 262% V, 314% V ~ 416% V, 396% V ~524% V, are much more than 115% V, can not meet the spacing between the top of the elevator shaft road safety requirements.

(A) when the elevator the rated speed for 2.5m/s, GB10060-1993 provided the buffer distance can guarantee top of elevator shaft road, the elevator pitch is safe;

(Ii) when the elevator rated speed respectively 1.60m/s, 1.75m/s, 2.00m/s, GB10060-1993 standard buffer distance in some distance segment elevator is secure, some distance segment elevator is not secure.

(3) when the elevator speed respectively 0.5m/s, 0.63m/s, 1.00m/s, GB10060-1993 standard buffer distance is too large, the elevator is not secure.

The author believes: GB10060-1993 the elevator installation acceptance "in the buffer to the weight and distance of specific provision is reasonable and does not meet the standards in GB7588-2003 on traction drive space at the top of the elevator shaft road, buffer distance setting should be able to ensure the elevator in various conditions are secure.