Analysis of production technical requirements and installation problems of plum coupling

Published: 2018-07-30

Plum coupling具有较高弹性（低刚度，大柔度），承受公称扭矩时转角为10度，转矩时为25度，可以降低轴系固有振动频率，改变柴油机动力装置轴系的扭振特性，使柴油机在需用转速范围内不出现危险的共振转速。具有较好的阻尼减振特性，可以吸收部分振动能量，减少通过振点时的振动振幅，降低轴段扭振应力。可以吸收和降低柴油机输出转矩的波动，对装有减速齿轮箱的柴油机动力装置而言，可以减少变动转矩时对齿轮面敲击，延长齿轮使用寿命。

梅花联轴器安装前应   先检查原动机和工作机两轴是否同心，两轴表面是否有包装纸和碰伤，梅花联轴器两个半联轴节内孔是否有杂物，内孔棱边是否有碰伤、如有应将轴、半联轴节清理干净，碰伤用细锉处理好。然后检查两个半联轴节的内孔直径和长度是否同原动机、工作机的直径和轴伸长度尺寸相符。一般选型时，让原动机和工作机端半联轴节长度小于其轴伸长度10—30mm为好。

梅花联轴器为了便于安装，是将两个半联轴节放在120--150的保温箱或油槽中进行预热，使内孔尺寸涨大很容易装上。安装后轴头不能凸出半联轴节端面，以齐平为好。检测两半联轴节之间的距离：沿半联轴节的法兰盘两内侧测出3--4点的读数取平均值，及加长段与两个膜片组实测尺寸之和，两者误差控制在0—0.4mm范围之内。找正：用百分表检测两半联轴节法兰盘端面和外圆跳动，当法兰盘外圆小于250mm时跳动值应不大于0.05mm；当法兰盘外圆大于250mm时，跳动值应不大于0.08。安装螺栓：把螺栓从法兰盘小孔外侧穿入，从另一件法兰盘大孔外侧穿出套上缓冲套、弹性垫圈、扭上螺母，用扳手将螺母把紧。如安装不适或拆除   换，又不损伤轴及半联，安装完毕后，转动自如无别劲为好。

弹性体一般都是工程塑料或是橡胶组成。联轴器的寿命也就是弹性的寿命。由于弹性是是受压而显而易见受拉。一般弹性体的寿命为10年。由于弹性具有缓冲，减振的作用，所以在有强烈振动的场合下使用较多。弹性体的性能   温度，决定了联轴器的使用温度，一般为-35至+80度。

梅花联轴器主要有两种类型，一种是传统的直爪型的，另一种是曲面（内凹）爪型的零间隙联轴器。传统的直爪型梅花联轴器不适合用在精度很高的伺服传动应用中。零间隙爪型梅花联轴器是在直爪型的基础上演变而来的，但不同的是其设计能适合伺服系统的应用，常用于联接伺服电机、步进电机和滚珠丝杆。

Production technical requirements for plum coupling:

1. The amount of operating compensation refers to the two-axis phase offset formed by comprehensive factors such as manufacturing errors, installation errors, and changes in working load caused by vibration, shock, and temperature changes in the working state.

2. The surface of half coupling, flange coupling, flange half coupling, brake wheel, brake wheel half coupling is not allowed to have cracks, shrinkage holes, air bubbles, slag inclusion and other defects that affect strength. The surface of the brake wheel should be quenched, the hardness is 45~55HRC, and the hardened layer is greater than 3mm.

3. The shape of the elastic part should be smooth and flat, and the working surface should not have pitting, and there should be no defects such as impurities, bubbles, cracks, etc. inside.

4. The shaft hole tolerance of the semi-coupling is in accordance with the provisions of GB/T3852-1997, and the surface roughness Ra value of the shaft hole is not less than 1.6um.

5. Before the coupling leaves the factory, carry out trial assembly. The relative trial assembly position between the half coupling and the elastic part shall be no less than two positions, which should be convenient for assembly and disassembly.

6. The coupling used under high-speed working conditions should undergo a balance test with the main shaft system.

7. The coupling should be cleaned before packaging, and the coupling surface should be coated with anti-rust agent, and the non-coupling surface should be coated with paint or other anti-rust treatment.

梅花联轴器的使用越来越广泛，但很多用户对安装梅花联轴器的一些细节问题不是很清楚，下面就来为您简单介绍一下：

1. Before installation, check whether the two shafts of the prime mover and the working machine are concentric, whether there are wrapping paper and scratches on the surfaces of the two shafts, whether there are debris in the inner holes of the two half couplings of the plum coupling, and whether the edges of the inner holes are If there are bruises, the shaft and half coupling should be cleaned up, and the bruises should be treated with a fine file.Then check whether the inner hole diameter and length of the two half couplings are consistent with the diameter and shaft elongation of the prime mover and working machine.In general selection, it is better to make the length of the prime mover and the working machine end half-coupling less than 10-30mm of shaft elongation.

2、为了便于安装，将两个半联轴节放在120--150的保温箱或油槽中进行预热，使内孔尺寸涨大很容易装上。安装后轴头不能凸出半联轴节端面，以齐平为好。检测两半联轴节之间的距离：沿半联轴节的法兰盘两内侧测出3--4点的读数取平均值，及加长段与两个膜片组实测尺寸之和，两者误差控制在0—0.4mm范围之内。

3、找正：用百分表检测两半联轴节法兰盘端面和外圆跳动，当法兰盘外圆小于250mm时跳动值应不大于0.05mm；当法兰盘外圆大于250mm时，跳动值应不大于0.08。

4. Install the bolts: insert the bolts from the outside of the small hole of the flange, pass through the outside of the large hole of the other flange, put on the buffer sleeve, elastic washer, twist the nut, and tighten the nut with a wrench.If the installation is unsuitable or if it is removed and replaced without damaging the shaft and the half coupling, it is better to rotate freely after installation.

5. Instructions for the operator: Before starting the equipment, check whether the nut of the plum coupling is loose or falling off. If so, tighten the nut with a wrench in time.

6、实践证明，如按说明及要求进行安装、维护、操作、梅花联轴器的日启动次数在1--5次，膜片的使用寿命   少5年以上。如不按说明书的要求进行安装、维护、操作，特别是螺栓方向装错使膜片变形或原动机与工作机两轴轴心偏移过大都会使膜片提前损坏。