The design of large-sized factory drilling machines

Foundation plate which is fixed to understructure is the base of the whole drill press. On the plate the internal fixed column is put on which hinged section of drill press rotate? Hinged section consists of external column, hose pipe and drilling head.

Hose pipe moves along the external cylinder column by the means of lifting mechanism which is situated on the upper end face of the column; clamp of the hose pipe on the external column is carried out automatically after finishing of lifting or descending.

The clamp of external column on the internal one during the work of the drill press is carried out by hydraulic mechanism which is built into the block of the lifting mechanism.

Drilling head which moves on the hose pipe guides by hand is the independent integral unit which includes the following units: gear shift transmission, supplying mechanism, mainspindle with balancer weight and others. While working on the drill press the drilling head is fixed in the hose pipe by hydraulic mechanism which work simultaneously with the clapping mechanism of the column. Both mechanisms are controlled from one pushbutton station.

All controlling drill press organs are concentrated on the drilling head. Drill press is equipped with five electric motors. Electric equipment is arranged into recesses in the back part of the hose pipe. Inductive electric panel is located in the soleplate of the internal column.

Gear shift transmissions

In order to get different speeds of mainspindle's rotation it's necessary to have the ability to transfer the movementfrom electric motor to mainspindle through kinematic chains with different transmission ratio. The gear shift transmission is used for this purpose. Types and constructions of gear shift transmissions used in drill press are different. It's as more complex as more different speeds are. It can be seemed that every gear shift transmission differs from other ones significantly but in reality all of them are assembled from standard elements and if you know principle of work of this elements and types of their combination then it's not very difficult to understand the mechanism of every gear shift transmission.

Feeding box

Feeding box is situated in the separate block which is the fronted part of the drilling press and which is fixed to the main block. Feeding box provides getting of 18 mechanical feeds on one rotate of mainspindle.

Tooth wheels of the feeding box are mill annealed and arranged on the splined shafts rotated on the multiball bearings. Bearings and tooth wheels of the feeding box are greased with oil flowing down from gear shift transmission. Switching over the feeding box is carried out by the means of single-handling mechanism.

Conic disks are situated on the sleeve. Disk defines the position of the lever groups which are connected with double toothed blocks of the spindles. Disk defines position of the lever group which switches over the triple block of the spindle.

The switching over the feeding box is carried out in such a way: by rotating of the handle on yourself you output disks from bonding with fingers of lever groups. Then rotate the handle up to compliance of the indicator with the size of necessary feed (feeding scale is fixed on the block). After this the rotation of the handle on yourself starts the movement of the toothed blocks.

Supplying mechanism

Supplying mechanism is situated in one block with the box and consists of two parts: vertical spindle and horizontal spindle.

Vertical spindle of supplying mechanism is connected with the feeding box by the means of toothed clutch upper part of which enters into the bonding with clutch's detail of the feeding box. Through the ball protecting clutch which defends drill press mechanisms from the overwork under the influence of the axial force of the feed the rotation transfers to the splined sleeves situated on the warm shaft.

Toothed clutch is switched over by lever group which is rotated by the handle and fixed by spring plunger. When switched off clutch it's possible with the help of the flywheel to carry out the feed of the mainspindle by hand. The warm is situated in the bonding with warm wheel stock of which is free sitting on the horizontal spindle. Stock is connected with the holder of the toothed clutch by the front advanced cams.

By this we shell finish the description of industrial drill press. Nowadays they are used in the hand production where the process of production is not removed on the robotized conveyor lines.