CN201760758U - Double exchange work station - Google Patents

Abstract

A double exchange work station, which includes two exchange stations, which are arranged on the rear side of the machine tool and arranged symmetrically relative to the working position; Including driving device, reducer, main sprocket, driven sprocket, chain and traction parts connected to the chain; the main sprocket is set at one end of the working platform, connected with the reducer and driving device; the driven sprocket is set on the working platform The other end; the workbench tray is set on the load bearing, the bottom is provided with a guide block, and a guide groove is set on the guide block; one end of the traction member can be embedded in the guide groove; the starting position feedback mechanism includes a synchronous sprocket and a reducer It is in contact with the encoder and proximity switch; the synchronous sprocket is in contact with the chain of the traction mechanism. The utility model adopts the drive chain transmission form, and the traction mechanism automatically wedges and disengages the worktable tray with the movement of the chain, so that the worktable tray can be directly driven in place; the encoder feedback mechanism is used to make the transmission accurate and reliable.

Description

A dual-switch workstation

technical field

The utility model relates to mechanical processing equipment, in particular to a double exchange work station.

Background technique

With the development of modern manufacturing technology, mechanical processing has higher and higher requirements for processing efficiency, that is, it requires continuous reduction of processing hours. At this time, in order to improve the processing efficiency by reducing the clamping time, a double exchange table device appeared, that is, the machine tool clamps the workpiece on the other table during the processing of one table.

At present, there are generally two forms of double-table exchange, translation and rotation. Generally, the double exchange workbench of medium and small machine tools mainly adopts the rotary type, such as: the motor drives the worm gear to realize the rotary motion; the hydraulic cylinder drives the rack, and the rack drives the gear to rotate; in addition, the swing oil is used to realize 180 °rotated; etc. The form of double exchange table of large and medium-sized machine tools is mainly of translational type, such as: the traction mechanism is driven by the hydraulic cylinder, and the traction mechanism pushes and pulls to drive the table pallet to translate; the hydraulic cylinder drives the sprocket, chain, and chain to drive the table pallet to translate; etc. wait.

As mentioned above, if the rotary double worktable exchange form is used for the double worktable exchange of large and medium-sized machine tools, because the rotation diameter is too large during the exchange, the overall structure of the machine tool will also be enlarged accordingly, so this kind of usage is generally not used. However, the transmission structure of the existing translational double workbench exchange form is complicated. Generally, after it is in place, there must be a lifting movement to break away from the traction mechanism to realize movement in the working direction, and it is difficult to ensure the accuracy and reliability of the transmission.

Contents of the invention

Aiming at the problems existing in the translational double worktable exchange of large and medium-sized machine tools at present, the purpose of this utility model is to design a double exchange work station, which has a simple structure and a convenient, accurate and reliable transmission form.

In order to achieve the above object, the technical scheme that the utility model adopts is:

A double exchange work station, which includes two exchange stations arranged symmetrically on the rear side of the bed; the exchange stations respectively include an underframe on which a work platform is arranged, and two rows of load bearings are arranged on the work platform along the length direction; The traction mechanism is arranged on the working platform of the underframe, including a driving device, a reducer, a main sprocket, a driven sprocket, a chain and a traction member connected to the chain; the main sprocket is arranged at one end of the working platform of the underframe, and The driven sprocket is set at the other end of the working platform of the underframe, and is connected with the main sprocket through a chain; the workbench tray is set on the load bearing on the workplatform of the underframe, and the bottom of the workbench tray is provided with a guide block. A guide groove is provided on the guide block along the width direction of the underframe working platform; one end of the traction part of the traction mechanism can be embedded in the guide groove; the length of the guide groove is greater than the distance between the axis of the traction part and the axis of the main sprocket; The initial position feedback mechanism includes the synchronous sprocket and the connected reducer and encoder and proximity switch; the synchronous sprocket is in contact with the traction mechanism chain; the initial position feedback mechanism includes the synchronous sprocket and the connected reducer and encoder and the proximity switch; the synchronous sprocket is in contact with the chain of the traction mechanism; the proximity switch is set on the working platform between the driving and driven sprockets, corresponding to the worktable tray.

Further, the encoder is an absolute rotary encoder, and the proximity switch is set on the working platform between the main and driven sprockets. The displacement distance of the table pallet depends on the time from the start of the work of the type rotary encoder to the release of the table pallet from the traction mechanism.

Moreover, the utility model also includes a positioning device, which is arranged at the initial position of the workbench tray; its function is to prevent the workbench tray from moving when the workpiece is clamped; in addition, when the workbench tray returns to the initial position position, it also acts as a limiter.

The positioning device is a positioning block with compression springs.

In addition, the utility model also includes a limit and anti-collision device, which is arranged at the ends of the two rows of load bearings on the working platform of the underframe.

Furthermore, the speed reducer is a frequency conversion speed reducer with brake. The driving device of the traction mechanism is a motor.

The utility model has the advantages of:

1. The utility model adopts the drive chain transmission form, and the traction mechanism automatically wedges and disengages the worktable tray with the movement of the chain, so that the workbench tray can be directly driven in place;

2. The utility model adopts a feedback mechanism with an encoder to make the transmission accurate and reliable;

3. It adopts ordinary variable frequency motor and reducer, and it can realize the function of servo motor with an encoder. While completing the double exchange work of the workbench, it makes the transmission structure simpler, improves the transmission accuracy and reliability, and can be used on the horizontal Widely used in machining center machine tools;

4. The organization has the advantage of low cost, high promotion value and social benefits.

Description of drawings

Fig. 1 is the position distribution schematic diagram of an embodiment of the utility model;

Fig. 2 is the top view of a workstation of the utility model embodiment;

Fig. 3 is a sectional view along line A-A of Fig. 2 .

Detailed ways

Referring to Figures 1 to 3, the double exchange workstation of the present invention includes two exchange stations 10 and 20, which are arranged symmetrically on the rear side of the bed.

The exchange station 10 (taking the exchange station 10 as an example, the exchange station 20 is identical) respectively includes an underframe 1 on which a working platform 2 is arranged, and two rows of load bearings 3, 3' are arranged on the working platform 2 along the length direction; traction Mechanism 4 is arranged on the underframe 1, including a driving device 41, a reducer 42, a main sprocket 43, a driven sprocket 44, a chain 45 and a traction member 46 connected to the chain 45; the main sprocket 43 is arranged on the bottom One end of the frame working platform 2 is connected with the reducer 42 and the driving device 41; the driven sprocket 44 is set at the other end of the underframe working platform 2, and is connected with the main sprocket 43 through a chain 45; the workbench tray 5 is arranged on the underframe The load bearing 3, 3' on the work platform 2, the bottom of the workbench tray 5 is provided with a guide block 6, and the guide block 6 is provided with a guide groove 61 along the width direction of the underframe work platform 2; Located in the guide groove 61; the length of the guide groove 61 is greater than the distance between the axis of the traction member 46 and the axis of the main sprocket 43; the initial position feedback mechanism 7 includes a synchronous sprocket 71 and a connected reducer 72 and Encoder 73 and proximity switch 74; Synchronous sprocket 71 contacts with traction mechanism chain 45; Proximity switch 73 is arranged on the working platform between the main and driven sprockets, corresponding to the workbench tray;

In this embodiment, the encoder 73 is an absolute rotary encoder, and the proximity switch 73 is arranged on the working platform between the driving and driven sprockets, and its setting position is to move the tray of the working platform by the traction mechanism to pull the working platform. The pallet sensing proximity switch controls the displacement distance of the table pallet during the period from the start of work of the absolute rotary encoder to the time when the table pallet is disengaged from the traction mechanism.

Further, the utility model also includes positioning devices 8, 8', which are arranged at the initial position of the workbench tray 2. In this embodiment, the positioning devices 8, 8' are positioning devices with compression springs. piece.

In addition, the utility model also includes limit and anti-collision devices 9, 9', which are arranged on the ends of the two rows of load bearings 3, 3' on the underframe working platform 2.

In this embodiment, the speed reducer 42 is a frequency conversion speed reducer with brake. The traction mechanism driving device 41 is a motor.

Taking the working process of a workstation of the utility model as an example, the driving device of the traction mechanism drives the reducer—the frequency conversion reducer with brake is driven to the driven sprocket through the main sprocket and chain. The traction piece moves with the chain and is embedded in the guide block on the workbench tray, thereby driving the workbench tray to move from the initial position. When the chain is driven, it is parallel to the workbench surface, so that the workbench tray can be driven in place. After that, it will automatically disengage the traction piece on the chain without interfering with its movement in the working direction. Equally, when it is processed and returns to the position when the chain is disengaged in the working direction, the frequency conversion reducer with brake on the exchange workstation is reversed to make the previous movement run in reverse and return to the initial position. The position control is realized through synchronous sprocket, reducer, absolute rotary encoder and proximity switch.

After the workpiece is clamped on the worktable pallet on the left exchange station (exchange station 10), it is transmitted to the working position (shown by the solid line arrow in Figure 1) through the above transmission mode, and the workpiece is processed; at the same time, at the right exchange station (exchange station 10) Station 20) for workpiece clamping, when the workpiece at the working position is processed, return to the left exchange station along the above return method (shown by the dotted arrow in Figure 1), and then, the worktable pallet on the right exchange station starts to pass through the same transmission The mode is transmitted to the working position to process the workpiece; when the worktable pallet on the left exchange station reaches the initial position, the workpiece is disassembled and a new workpiece is clamped, and the subsequent steps are the same as above. the

Claims (8)

1. a double crossing over work station is characterized in that, comprise,

Two switching stations are arranged at the bed piece rear side, symmetric arrangement; This switching station comprises respectively,

Underframe is established workbench on it, establish two solid axles of listing on the workbench along its length and hold;

Haulage gear is arranged on the underframe workbench, comprises drive unit, reductor, head sprocket, driven sprocket, chain and is connected in a traction piece of chain; Head sprocket is arranged at an end of underframe workbench, is connected with reductor and drive unit; Driven sprocket is provided with the other end of underframe workbench, is connected with head sprocket by chain;

The workbench pallet is arranged at the load-carrying bearing on the underframe workbench, and guide pad is established in the workbench tray bottom, and this guide pad upper edge underframe workbench width is offered direction recess; Traction piece one end of haulage gear can be embedded in this direction recess; Direction recess length is greater than the distance between traction piece axis and the head sprocket axis;

The original position feedback mechanism comprises synchronous sprocket wheel and the decelerator that is connected and encoder and near switch; Synchronous sprocket wheel contacts with the haulage gear chain; Be arranged at workbench between the driving and driven sprocket wheel, corresponding workbench pallet near switch.

2. double crossing over work station as claimed in claim 1, it is characterized in that, described encoder is an absolute rotary encoder, be arranged at workbench between the driving and driven sprocket wheel near switch, its be provided with the position with haulage gear traction workbench pallet move, the work of workbench pallet inductive proximity switch control absolute rotary encoder begin to the workbench pallet throw off haulage gear during this period of time in workbench pallet shift length and deciding.

3. double crossing over work station as claimed in claim 1 is characterized in that, also comprises positioner, is arranged at the original position of described workbench pallet.

4. double crossing over work station as claimed in claim 3 is characterized in that, described positioner is the locating piece of band compression spring top clamping.

5. double crossing over work station as claimed in claim 1 is characterized in that, also comprises spacing anticollision device, collision-prevention device, is arranged on the underframe workbench two ends that solid axle holds of listing.

6. double crossing over work station as claimed in claim 1 is characterized in that, described reductor is the frequency conversion reductor of band brake.

7. double crossing over work station as claimed in claim 1 is characterized in that, described encoder feedback mechanism is a cover decelerator and an absolute rotary encoder.

8. double crossing over work station as claimed in claim 1 is characterized in that, described traction mechanism drive is a motor.

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