CN220885934U - Turning device and work piece conveying line - Google Patents

Abstract

The embodiment of the application discloses a turnover device which comprises a first bottom bracket, a turnover assembly and a first roller mechanism, wherein the turnover assembly comprises a first end plate, a first driving piece and a clamping mechanism, and is used for clamping and turning a workpiece; the first roller mechanism is arranged in a first frame, and the first frame is arranged on the top of the first bottom bracket and is connected with the first end plate side by side; the first roller mechanism is adapted to drive a workpiece located on the first end plate to move in a first direction. According to the turnover device based on the structure, the workpiece can be turned over conveniently through the turnover assembly and is conveyed to the next link through the first roller mechanism, so that automatic turnover and conveying of the workpiece are realized. The application also provides a workpiece conveying line, which comprises a turnover device, a first movable roller device and a to-be-tested buffer device, and based on the turnover device, the workpiece is automatically turned and then conveyed to the first movable roller device and further conveyed to the to-be-tested buffer device for waiting for subsequent testing.

Description

Turning device and work piece conveying line

Technical Field

The application relates to the field of production and processing of frequency converters, in particular to a turnover device and a workpiece conveying line.

Background

The power unit is one of the components of the high-voltage frequency converter, is a main part of a loop of the high-voltage frequency converter, and uses power electronic devices for rectification, filtering and inversion.

Currently, in the production and processing of frequency converters, the following steps are generally adopted:

1. manually assembling the power unit;

2. Manually overturning the power unit by 90 degrees to stand on the lifting vehicle;

3. Manually pushing the lifting vehicle carrying the power unit to a buffer area to be tested before testing, and pushing the power unit device into the buffer area;

4. Manually pushing the power unit device to be tested to an upper lifting vehicle, transferring to a test bench, and pushing the power unit device to be tested to test;

5. the test board tests the power unit;

6. manually pulling the tested power unit device out of the test bench and transferring;

7. manually transferring the tested power unit device to a buffer area for storing the to-be-placed product after testing;

8. The power unit device to be assembled is manually taken away.

It can be seen that in the above operation steps, the power unit needs to be manually turned up to be loaded, so that potential safety hazards exist; and in the follow-up connection of all steps, the transportation is carried out manually, so that safety accidents are easy to occur; in addition, the efficiency is low, and the product quality is also affected due to uncontrollable human factors.

Disclosure of utility model

In view of the foregoing, embodiments of the present application provide a test platform for an electronic device, which is used for at least automatically overturning a workpiece, and more preferably, can maximally satisfy the function of automatically conveying a processed workpiece.

According to a first aspect of the present utility model, there is provided a flipping unit comprising a first bottom bracket;

The overturning assembly comprises a first end plate, a first driving piece and a clamping mechanism, wherein the first end plate is arranged at the top of the first bottom bracket, the first driving piece is in driving connection with the first end plate so as to enable the first end plate to overturn, and the clamping mechanism is arranged on the first end plate and is suitable for clamping a workpiece placed on the first end plate;

The first roller mechanism is arranged in a first frame, and the first frame is arranged on the top of the first bottom bracket and is connected with the first end plate side by side; the first roller mechanism is adapted to drive the workpiece on the first end plate to move in a first direction.

Based on the turning device of above structure, can conveniently overturn the work piece through the upset subassembly to convey to next link through first cylinder mechanism, realized the automatic upset and the conveying of work piece.

Further, the clamping mechanism arranged on the first end plate comprises a clamping driving piece and a clamping chuck, the clamping chuck is connected with the clamping driving piece, and the clamping chuck is arranged on one side of the upper end face of the first end plate and can move up and down along the second direction under the driving of the clamping driving piece so as to clamp the workpiece.

Through the structure, the workpiece can be clamped, and the workpiece clamping device is suitable for adjusting the height of the workpiece.

Further, a first baffle plate for limiting the workpiece is further arranged on the first end plate.

With the above structure, the work piece can be assisted to be placed more accurately on the first end plate.

According to another aspect of the present utility model, there is provided a workpiece conveying line, including the flipping device of the above embodiment, further including a first moving roller device connected to the flipping device to receive the workpiece from the flipping device, and a to-be-measured buffer device connected to the first moving roller device to receive the workpiece from the first moving roller device; the first moving roller device comprises a second bottom bracket, a jacking mechanism and a second roller mechanism, wherein the jacking mechanism is slidably arranged on the second bottom bracket, the second roller mechanism is connected with the jacking mechanism and is arranged to be capable of moving along a third direction under the driving of the jacking mechanism so as to be in butt joint with the first roller mechanism of the turnover device, and the second roller mechanism is suitable for driving the workpiece to move along the first direction.

Through the work piece conveying line of this structure, realize conveying the work piece after accomplishing automatic upset to first removal roller device to further on conveying to await measuring the buffer memory device, be used for subsequent test. The program is automatically operated, the potential safety hazard of manpower is reduced, and the working efficiency is improved. And the first movable roller device with adjustable height is arranged, so that the good connection between the turnover device and subsequent equipment is satisfied.

Further, the to-be-tested buffer device comprises a third bottom bracket and at least one third roller mechanism slidably arranged on the third bottom bracket, wherein the third roller mechanism is suitable for being in butt joint with the second roller mechanism of the first moving roller device and driving the workpiece from the second roller mechanism to move along the first direction.

Based on the to-be-detected buffer device with the structure, the first movable roller device can be abutted, and the received workpiece can be smoothly moved to the next link.

Further, the to-be-tested buffer device comprises three groups of third roller mechanisms which are arranged in parallel.

Through this structure for the work piece volume of buffering is bigger, has further improved work efficiency.

Further, the buffer device comprises a second moving roller device, wherein the second moving roller device comprises a fourth bottom bracket and at least one fourth roller mechanism slidably arranged on the fourth bottom bracket, and the fourth roller mechanism is suitable for being in butt joint with the third roller mechanism of the buffer device to be tested and driving the workpiece from the third roller mechanism to move along the first direction.

Based on the workpiece conveying line of the embodiment, the operation of the workpiece between the to-be-tested buffer device and the test bench can be realized.

Further, a tested buffer device is also included, the tested buffer device includes a fifth bottom bracket and at least one fifth roller mechanism slidably disposed on the fifth bottom bracket, the fifth roller mechanism is adapted to drive the workpiece from the outlet of the test bench to move along the first direction.

With the above structure, the tested workpiece from the test bench can be stored.

Further, the tested buffer device comprises three groups of fifth roller mechanisms which are arranged in parallel. In this way, achieving a larger amount of storage can be accomplished.

Further, the device also comprises a third moving roller device, wherein the third moving roller device comprises a sixth roller mechanism, one end of the sixth roller mechanism is in butt joint with the outlet of the test bench to receive the workpiece from the test bench, and the other end of the sixth roller mechanism is slidably arranged on one side of the tested buffer device and is suitable for moving the workpiece to the fifth roller mechanism of the tested buffer device along the first direction.

In this way, the tested workpieces conveyed from the test bench can be selectively conveyed to any group of fifth roller mechanisms in the tested buffer device, so that the storage is more flexible.

According to the turnover device provided by the application, the workpiece is firstly placed on the first end plate of the turnover assembly through the arrangement of the parallel turnover assembly and the first roller mechanism, and the turnover of the first end plate is realized through the first driving piece, so that the degree of the workpiece is turned over to the first roller mechanism, and the first roller mechanism can drive the workpiece to move along the first direction, so that the workpiece is smoothly loaded into a process device behind the process, the whole process is automatically completed, the efficiency is high, and the safety is effectively ensured; in addition, the application also provides a workpiece conveying line, which sequentially integrates the turnover device, the first movable roller device and the to-be-detected buffer device, so that the workpiece on the turnover device can be easily conveyed to the first movable roller device, and the workpiece of the first movable roller device can be further conveyed to the to-be-detected buffer device, and the workpiece conveying is realized efficiently and safely.

Drawings

The above and other features and advantages of the present application will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which:

Fig. 1 is a schematic structural view of a flipping device according to an embodiment of the present application;

fig. 2 is a schematic structural view of a flipping device according to another embodiment of the present application;

FIG. 3 is a schematic view of a workpiece transfer line in accordance with one embodiment of the application;

fig. 4 is a schematic structural view of a first moving drum device according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a buffer device under test according to an embodiment of the present application;

Fig. 6 is a schematic structural view of a second moving drum device according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a tested cache device according to an embodiment of the present application;

Fig. 8 is a schematic structural view of a third moving drum device according to an embodiment of the present application.

Reference numerals illustrate:

1 turning device

11 First bottom bracket

13 First end plate

15 First driving member

17 First roller mechanism

21 Clamping driving piece

23 Clamping chuck

25 First baffle

27 Error-proofing sensor

30 First moving roller device

31 Second bottom bracket

33 Jack-up mechanism

35 Second roller mechanism

40-To-be-tested buffer device

41 Third bottom bracket

43 Third roller mechanism

Second moving roller device 50

51 Fourth bottom bracket

53 Fourth roller mechanism

60 Measured buffer memory device

61 Fifth bottom bracket

63 Fifth roller mechanism

70 Test bench

80 Third moving roller device

90-Degree operation door

X first direction

Y second direction

Z third direction

Detailed Description

The present application will be further described in detail with reference to the following examples, in order to make the objects, technical solutions and advantages of the present application more apparent.

Fig. 1 and 2 are schematic structural views of a flipping device according to an embodiment of the application;

As shown in fig. 1 and 2, the turning device 1 comprises a first bottom bracket 11, a turning assembly and a first roller mechanism 17, wherein the turning assembly comprises a first end plate 13, a first driving member 15 and a clamping mechanism, the first end plate 13 is arranged on the top of the first bottom bracket 11, the first driving member 15 is in driving connection with the first end plate 13 to turn the first end plate 13, and the clamping mechanism is arranged on the first end plate 13 and is suitable for clamping a workpiece placed on the first end plate 13; the first roller mechanism 17 is arranged in a first frame which is arranged on top of the first bottom bracket 11 and is connected with the first end plate 13 side by side; the first roller mechanism 17 is adapted to drive a workpiece located on the first end plate 13 to move in the first direction X.

In particular, the workpiece may be a power unit of a frequency converter. The first end plate 13 and the first frame are arranged in parallel, and can be separately designed or can be in a rotatable connection structure, under the default condition, the first end plate 13 is horizontally arranged, the first frame is vertically arranged, and when the first end plate 13 is driven by the first driving piece 15 to be erected and turned over by 90 degrees from the horizontal direction, the first frame and the first roller mechanism 17 arranged therein are vertically rotated to be in the horizontal direction.

The first driving member 15 may be disposed at the bottom of the first end plate 13, and the first driving member 15 is, for example, a cylinder, an output rod of which is connected to the bottom end surface of the first end plate 13, and the other end of which is fixed to the first bottom bracket 11;

Further, the clamping mechanism provided on the first end plate 13 includes a clamping driving member 21, and a clamping chuck 23, the clamping chuck 23 being connected to the clamping driving member 21 and located above the upper end surface of the first end plate, the clamping chuck 23 being provided so as to be movable up and down in the second direction Y under the driving of the clamping driving member 21 to clamp the workpiece.

Specifically, the clamping driving member 21 may include a driving cylinder disposed on a bottom end surface of the first end plate 13 and a driving connection member connected to an output end of the driving cylinder, where the driving connection member passes through the first end plate 13, and two clamping chucks 23 are disposed at an end of the driving connection member located on an upper end surface of the first end plate 13 along the first direction X, and the clamping driving member 21 may drive the driving connection member to move up and down so as to drive the clamping chucks 23 to move along the second direction Y, so that a workpiece placed on the first end plate 13 may be clamped, for example, the clamping chucks 23 may be clamped on a radiator part of the power unit.

Further, bull's eye sliding mechanisms are distributed on the first end plate 13. In this way, it is convenient to place the assembled power unit onto the first end plate 13.

Further, the first end plate 13 is provided with an error-proofing sensor 27 adapted to the placement end face of the work.

For example, four error proofing sensors 27 may be provided distributed to adapt to the shape of the workpiece placement end surface, and only if three of them are successfully sensed and the other is not, this will indicate that the workpiece is successfully placed on the first end plate 13.

Further, a first baffle 25 is further disposed on the first end plate to limit the workpiece. The first baffle 25 is adapted to the position and shape of the outer wall of the workpiece, and can effectively limit the workpiece, thereby improving the loading efficiency and accuracy.

The first roller mechanism 17 may be composed of a roller and a roller driving mechanism, wherein the roller driving mechanism includes a driving motor, a driving chain, a driving sprocket and a driving driven sprocket, so that the roller can roll along the first direction X under the action of the roller driving mechanism, thereby conveying the workpiece thereon to the first direction X. The above roller drive mechanisms are well known to those skilled in the art and need not be further developed herein.

FIG. 3 is a schematic view of a workpiece transfer line in accordance with one embodiment of the application; fig. 4 is a schematic structural view of a first moving drum device according to an embodiment of the present application;

According to another aspect of the present application, a workpiece transfer line is provided. As shown in fig. 3 and 4, the workpiece conveying line comprises a turning device 1, a first moving roller device 30 and a to-be-tested buffer device 40, wherein the first moving roller device 30 is connected with the turning device 1 to receive the workpiece from the turning device 1, and the to-be-tested buffer device 40 is connected with the first moving roller device 30 to receive the workpiece from the first moving roller device 30; the first moving roller device 30 includes a second bottom bracket 31, a lifting mechanism 33, and a second roller mechanism 35, the lifting mechanism 33 is slidably disposed on the second bottom bracket 31, the second roller mechanism 35 is connected with the lifting mechanism 33 and is configured to be capable of moving along a third direction Z to interface with the first roller mechanism 17 of the turnover device 1 under the driving of the lifting mechanism 33, and the second roller mechanism 35 is adapted to drive the workpiece to move along a first direction X.

Specifically, a first longitudinal beam and a second longitudinal beam which are horizontally spaced are arranged above the second bottom bracket 31, a first guide rail and a second guide rail are respectively arranged on the first longitudinal beam and the second longitudinal beam, a synchronous belt driving assembly composed of a motor, a rack and the like is also arranged, and the jacking mechanism 33 slides along the first guide rail and the second guide rail under the action of the synchronous belt driving assembly; synchronous belt drive assemblies are well known to those skilled in the art and are not developed herein. The synchronous belt assembly driven by the motor is matched with the guide rail, so that the lifting mechanism 33 slides more stably and smoothly. In addition, the synchronous belt driving assembly is added with a tensioning mechanism, so that the phenomenon of tooth jumping is prevented when the synchronous belt driving assembly drives the lifting mechanism 33 to operate.

Further, the jacking mechanism 33 is movably connected to the second bottom bracket 31 through a movable bottom plate, four vertical columns driven by a jacking cylinder to lift up and down are arranged at four corners of the movable bottom plate, and the second roller mechanism 35 is arranged at the top of the vertical columns and is driven by the vertical columns to lift up and down.

Furthermore, the four upright posts are embedded with linear bearings, and the linear bearings act on the optical axis rod during lifting/descending, so that the actions are smoother. Meanwhile, a buffer can be added, so that the lifting device works gently and has accurate position when being lifted in place.

Further, a sensor and a stopping mechanism can be arranged for detecting whether the vehicle is in place or not and stopping the vehicle.

Based on the above embodiment, since the assembled power unit is transferred to the turnover device 1 by the lift truck and the height of the lift truck is high, in order to accommodate the height of the lift truck, the turnover device 1 is also set to a high height, and therefore, in order to accommodate the height of the turnover device 1, the second roller mechanism 35 is made liftable and dockable with the turnover device 1 by providing the lifting mechanism 33 to the first moving roller device 30; and, when the workpiece is transported to the to-be-tested buffer device 40 again, the docking can be adjusted down, and each device of the subsequent procedure can be docked smoothly by adopting the normal height.

The second roller mechanism 35 may also have the same roller structure as the first roller mechanism 17, and will not be described here.

FIG. 5 is a schematic diagram of a buffer device under test according to an embodiment of the present application;

As shown in fig. 5, the buffer device 40 to be tested includes a third bottom bracket 41 and at least one third roller mechanism 43 slidably disposed on the third bottom bracket 41, the third roller mechanism 43 being adapted to interface with the second roller mechanism 35 of the first moving roller device 30 and drive the workpiece from the second roller mechanism 35 to move in the first direction X.

Further, the buffer device 40 to be tested includes three sets of third roller mechanisms 43 arranged in parallel.

Based on the workpiece conveying line of this embodiment, three sets of the third roller mechanisms 43 are provided, making it possible to store more workpieces. In implementation, the second roller mechanism 35 of the first moving roller device 30 may slide along the first and second stringers to transfer the workpiece from the second roller mechanism 35 to the third roller mechanism 43 for any of its three sets of third roller mechanisms 43.

Further, the third roller mechanism 43 is composed of two small driving roller mechanisms, so that the buffer space is increased, and more workpieces can be placed.

Fig. 6 is a schematic structural view of a second moving drum device according to an embodiment of the present application;

As shown in fig. 6, the workpiece transfer line further includes a second moving roller device 50, the second moving roller device 50 including a fourth bottom bracket 51 and a fourth roller mechanism 53 slidably disposed on the fourth bottom bracket 51, the fourth roller mechanism 53 being adapted to interface with the third roller mechanism 43 of the buffer device 40 to be tested and to drive the workpiece from the third roller mechanism 43 to move in the first direction X.

In the above embodiment, the synchronous belt driving assembly mentioned in the foregoing embodiment is further disposed in the second moving roller device, so as to drive the fourth roller mechanism to slide along the direction in which the three groups of third roller mechanisms in the buffer device to be tested are arranged, so that the workpiece on any one group of third roller mechanisms can be flexibly selected to be transferred to the test bench for testing; the fourth roller mechanism 53 may have the same structure as the first roller mechanism 17, the second roller mechanism 35, and the third roller mechanism 43, and will not be described in detail herein.

FIG. 7 is a schematic diagram of a tested cache device according to an embodiment of the present application;

As shown in fig. 7, the workpiece transfer line further includes a tested buffer device 60, and the tested buffer device 60 includes a fifth bottom bracket 61 and at least one fifth roller mechanism 63 slidably disposed on the fifth bottom bracket 61, the fifth roller mechanism 63 being adapted to drive the workpiece from the outlet of the test bench 70 to move in the first direction X.

In this way, the tested power unit can be directly transferred out through the tested buffer 60. The fifth roller mechanism 63 may be the same as the first roller mechanism 17, the second roller mechanism 35, the third roller mechanism 43, and the fourth roller mechanism 53, and will not be described in detail herein.

Further, the tested buffer device 60 includes three fifth roller mechanisms 63 arranged in parallel.

Fig. 8 is a schematic structural view of a third moving drum device according to an embodiment of the present application.

As shown in fig. 8, the third moving roller device 80 further includes a third moving roller device 80, wherein the third moving roller device 80 includes a sixth roller mechanism, one end of which is abutted with the outlet of the test bench 70 to receive the workpiece from the test bench 70, and the other end of which is slidably disposed at one side of the tested buffer device 60 and adapted to move the workpiece onto the fifth roller mechanism 63 of the tested buffer device 60 along the first direction X.

Specifically, the third moving roller device 80 includes a sixth roller mechanism disposed above, and further includes a bracket disposed below the sixth roller mechanism, where a guide rail may be disposed on each side of the tested buffer device 60 up and down to provide a synchronous belt driving assembly, and the bracket of the third moving roller device 80 and the corresponding side of the tested buffer device 60 may be slidably connected to the guide rail of the tested buffer device through a sliding connection piece, and horizontally slide along the guide rail under the driving of the synchronous belt driving assembly; synchronous belt drive assemblies are well known to those skilled in the art and are not developed herein.

Based on this embodiment, the third moving roller device 80 can move along the guide rail of the tested buffer device 60 and butt against the idle fifth roller mechanism 63 to transfer the workpiece out, increasing the transfer efficiency. In addition, it can be seen that the third moving roller device 80 is configured to be connected to the guide rail on the side wall of the tested buffer device 60 through the triangular bracket at the bottom, instead of adopting the structure of the bottom bracket with the bottom fixed at four corners, so that the upward movement thereof can be controlled (refer to fig. 3), thereby avoiding the space corresponding to the operation door 90, and enabling the operator to enter the workpiece of the test bench 70 through the operation door 90. When the operator finishes the operation, the third roller device 80 can be movably docked to the test bench up and down after being withdrawn from the operation door 90, receive the tested workpiece, and then move up and down to transfer the workpiece to the fifth roller mechanism 63 of any one of the three groups of the tested buffer device 60.

In the above embodiment, a travel switch can be further added, so that the risk of collision can be effectively prevented.

Furthermore, the respective rollers of the roller mechanisms also adopt an encapsulation process, so that friction between the workpiece and the rollers is reduced.

Further, the workpiece conveying line according to the embodiment of the utility model further comprises a controller, wherein each driving motor, each sensor and the like are connected into the controller, and are uniformly controlled by the controller.

For simplicity and clarity of description, the following description sets forth aspects of the application by describing several exemplary embodiments. Numerous details in the embodiments are provided solely to aid in the understanding of the application. It will be apparent, however, that the embodiments of the application may be practiced without limitation to these specific details. Some embodiments are not described in detail in order to avoid unnecessarily obscuring aspects of the present application, but rather only to present a framework. Hereinafter, "comprising" means "including but not limited to", "according to … …" means "according to at least … …, but not limited to only … …". The term "a" or "an" is used herein to refer to a number of components, either one or more, or at least one, unless otherwise specified.

The foregoing is merely a preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. Turning device (1), characterized in that it comprises:

A first bottom bracket (11);

The turnover assembly comprises a first end plate (13), a first driving piece (15) and a clamping mechanism, wherein the first end plate (13) is arranged at the top of the first bottom bracket (11), the first driving piece (15) is in driving connection with the first end plate (13) so as to enable the first end plate (13) to turn over, and the clamping mechanism is arranged on the first end plate (13) and is suitable for clamping a workpiece placed on the first end plate (13);

a first roller mechanism (17), the first roller mechanism (17) being arranged in a first frame, the first frame being arranged on top of the first bottom bracket (11) and being connected side by side with the first end plate (13); the first roller mechanism (17) is adapted to drive the workpiece located on the first end plate (13) to move in a first direction (X).

2. The turning device (1) according to claim 1, wherein the clamping mechanism provided on the first end plate (13) comprises a clamping driving member (21) and a clamping chuck (23), the clamping chuck (23) is connected with the clamping driving member (21), and the clamping chuck (23) is provided on one side of the upper end surface of the first end plate (13) and is configured to be movable up and down in the second direction (Y) under the driving of the clamping driving member (21) to clamp the workpiece.

3. The turning device (1) according to claim 1 or claim 2, wherein the first end plate (13) is further provided with a first baffle (25) for limiting the workpiece.

4. Workpiece conveying line, characterized by comprising a turning device (1) according to claim 1, and further comprising a first moving roller device (30), a buffer device (40) to be tested, the first moving roller device (30) being connected to the turning device (1) to receive the workpiece from the turning device (1), the buffer device (40) to be tested being connected to the first moving roller device (30) to receive the workpiece from the first moving roller device (30); wherein the first moving roller device (30) comprises a second bottom bracket (31), a jacking mechanism (33) and a second roller mechanism (35), wherein the jacking mechanism (33) is slidably arranged on the second bottom bracket (31), the second roller mechanism (35) is connected with the jacking mechanism (33) and is arranged to be capable of moving along a third direction (Z) under the driving of the jacking mechanism (33) so as to be in butt joint with the first roller mechanism (17) of the turnover device (1), and the second roller mechanism (35) is suitable for driving the workpiece to move along the first direction (X).

5. The workpiece transfer line according to claim 4, characterized in that said buffer device (40) to be tested comprises a third bottom bracket (41) and at least one third roller mechanism (43) slidably arranged on said third bottom bracket (41), said third roller mechanism (43) being adapted to interface with said second roller mechanism (35) of said first moving roller device (30) and to drive said workpiece from said second roller mechanism (35) to move in said first direction (X).

6. Workpiece transfer line according to claim 5, characterized in that said buffer device (40) to be tested comprises three sets of said third roller means (43) arranged side by side.

7. The workpiece transfer line according to claim 5 or claim 6, further comprising a second moving drum device (50), said second moving drum device (50) comprising a fourth bottom bracket (51) and at least one fourth drum mechanism (53) slidably arranged on said fourth bottom bracket (51), said fourth drum mechanism (53) being adapted to interface with said third drum mechanism (43) of said buffer device (40) to be tested and to drive said workpiece from said third drum mechanism (43) to move in said first direction (X).

8. The workpiece transfer line of claim 7, further comprising a tested buffer device (60), said tested buffer device (60) comprising a fifth bottom bracket (61) and at least one fifth roller mechanism (63) slidably arranged on said fifth bottom bracket (61), said fifth roller mechanism (63) being adapted to drive said workpiece from an outlet of a test bench (70) to move in said first direction (X).

9. The workpiece conveying line according to claim 8, characterized in that the tested buffer device (60) comprises three fifth roller mechanisms (63) arranged side by side.

10. The workpiece transfer line of claim 9, further comprising a third moving drum arrangement (80), said third moving drum arrangement (80) comprising a sixth drum mechanism, one end of which interfaces with an outlet of said test station (70) to receive said workpiece from said test station (70), the other end of which is slidably arranged on one side of said tested buffer arrangement (60) adapted to move said workpiece in said first direction (X) onto said fifth drum mechanism (63) of said tested buffer arrangement (60).