卷扬式启闭机可分为单吊点和双吊点两种，启门力QPQ、QPG、QPT型为50kN-2500kN;QPT型为50kN-1250kN,供用户选用。
1、本系列产品型号说明。
2、QPQ QPK QPG QPT系列产品的启门力或持住力是按照GB/783-65起重机械起重量系列规定优先系列选定。
3、QPQ QPK QPT QPG系列启闭机不能做也合斜吊运行。

4、QPG QPK QPT QPG系列启闭机的钢丝绳采用6W(19)型，公称抗拉强度1550～1700N/mm2。钢丝绳随机供应，常规每单机供40m。

    卷扬启闭机良好的运转离不开它的好搭档——制动装置，制动装置在卷扬启闭机的工作运行中，发挥了较大的作用。在起重机械的各个机构中，只有具备了可靠的制动装置后，机械才能安全准确地进行工作。制动机的作用是使机构运动速度从樶大值减到零(停止式制动器)，在快1速下落闸门的卷扬启闭机上，制动器的作用则限制机构运动速度在某一范围以内(调速式制动器)。起重机械所用的制动器是多种多样的，按结构特征可分为块式、带式和盘式，其中块式用得樶多；按工作状态可分为常团式和常开式，常闭式制动器经常在弹簧力作用下处于合闸状态，当机构起动时，电磁铁或电力液压推杆等推力克服弹簧力使之松闸。常开式制动器与此相反，它经常处于松闸状态，只有施加外力才能使它合闸。从工作安全出发，起重机的起升机构和变幅机构必须装有常闭式制动器。

The hoisting hoist can be divided into single hoisting point and double hoisting point. The hoisting force QPQ, QPG and QPT are 50 kN-2500 kN, and the QPT is 50 kN-1250 kN, which can be selected by users. 1. Type description of this series of products. 2. The opening force or holding force of QPQ QPK QPG QPT series products are selected according to the priority series stipulated in GB/783-65 lifting crane series. 3. QPQ QPK QPT QPG series hoist can not be done and can be operated with inclined crane. 4. The steel wire rope of QPG QPK QPT QPG series hoist adopts 6W (19) type with nominal tensile strength of 1550-1700N/mm2. Wire rope is supplied randomly and 40 m per machine is supplied routinely. The good operation of hoisting hoist can not be separated from its good partner - Brake device, which plays a greater role in the operation of hoisting hoist. In the various mechanisms of lifting machinery, only with reliable braking devices, can the machinery work safely and accurately. The function of the brake is to reduce the movement speed of the mechanism from the cutting value to zero (stop brake). On the hoisting hoist which drops the gate at a fast speed of 1, the function of the brake restricts the movement speed of the mechanism within a certain range (speed regulating brake). There are many kinds of brakes used in lifting machinery, which can be divided into block type, belt type and disc type according to their structural characteristics, among which block type is widely used. They can be divided into normal group type and open type according to their working status. The normal closed type brakes are often in the closing state under the action of spring force. When the mechanism starts, the electromagnet or electro-hydraulic push rod, etc. Thrust overcomes spring force to loosen the brake. On the contrary, the open brake is often in a state of loosening, and only by applying external force can it be closed. Starting from working safety, the hoisting mechanism and luffing mechanism of crane must be equipped with normal closed brakes.