CN221538324U - Marking mechanism - Google Patents

Abstract

A marking mechanism comprising: the bearing assembly is used for bearing the workpiece; the transfer component is arranged on one side of the bearing component and used for grabbing a workpiece on the bearing component; the sensing assembly comprises a detection unit and a sensor which are arranged on the transfer assembly at intervals, the detection unit is electrically connected with the sensor, the detection unit is driven by the transfer assembly to approach and abut against the workpiece to send out a sensing signal, the sensor is used for receiving the sensing signal to detect the external dimension of the workpiece, and the transfer assembly grabs the workpiece according to the detection result of the sensor; the detection positioning assembly is arranged at intervals with the bearing assembly and the transfer assembly, the detection positioning assembly is used for detecting the workpiece, and the transfer assembly stops moving the workpiece when the detection positioning assembly detects that the transfer assembly moves the workpiece to a preset position; the marking assembly is arranged on one side of the detection positioning assembly and used for marking the workpiece at the preset position. The marking mechanism can replace manual operation, and labor intensity of operators is reduced.

Description

Marking mechanism

Technical Field

The application relates to the technical field of marking, in particular to a marking mechanism.

Background

In production, a plurality of cutters are usually used, and for convenience of management, the cutters are usually marked for distinguishing. However, since manual marking accuracy is difficult to control and labor intensity is excessive, a mechanism with high operation accuracy is needed to mark the cutter.

Disclosure of utility model

In view of the foregoing, it is necessary to provide a marking mechanism that can replace manual marking on a cutter to improve marking accuracy and reduce labor intensity of operators.

The embodiment of the application provides a marking mechanism, which comprises a bearing assembly, a marking mechanism and a marking mechanism, wherein the bearing assembly is used for bearing a workpiece; the transfer assembly is arranged on one side of the bearing assembly and used for grabbing the workpiece on the bearing assembly; the sensing assembly comprises a detection unit and a sensor which are arranged on the transfer assembly at intervals, the detection unit is electrically connected with the sensor, the detection unit is driven by the transfer assembly to approach and abut against the workpiece to send out a sensing signal, the sensor is used for receiving the sensing signal to detect the external dimension of the workpiece, and the transfer assembly grabs the workpiece according to the detection result of the sensor; the detection positioning assembly is arranged at intervals with the bearing assembly and the transfer assembly, the detection positioning assembly is used for detecting the workpiece, and the transfer assembly stops moving the workpiece when the detection positioning assembly detects that the transfer assembly moves the workpiece to a preset position; the marking assembly is arranged on one side of the detection positioning assembly, is arranged at intervals with the bearing assembly and the transfer assembly, and is used for marking the workpiece at the preset position.

When the marking mechanism is used, the transfer component drives the detection unit to be close to the bearing component, the detection unit is abutted to the workpiece to send out a sensing signal, the sensor receives the signal transmitted by the detection unit to detect the outline dimension of the workpiece, and the transfer component accurately grabs the workpiece on the bearing component according to the detection result of the sensor. And after the workpiece is grabbed, the transfer component moves the workpiece to a preset position, when the detection positioning component detects the workpiece, the transfer component stops moving the workpiece, the workpiece is positioned at the preset position at the moment, and finally the marking component marks the workpiece. Because the marking process is automatically completed by the marking mechanism, manual operation is not needed, and the labor intensity of operators is reduced. Because manual marking is not needed, the marking precision is improved, and the marking efficiency is improved.

In some embodiments, the transfer assembly includes a robotic arm disposed on one side of the carrier assembly; the support is connected with the mechanical arm, and the detection unit and the sensor are arranged on the support; the clamping unit is arranged on the support and is arranged with the detection unit and the sensor at intervals, and is used for clamping the workpiece, turning over the workpiece under the drive of the mechanical arm, enabling the end face to be marked on the workpiece to face the marking assembly, and transferring the workpiece to the preset position under the drive of the mechanical arm.

In some embodiments, the clamping unit is further configured to turn over the workpiece with the end face marked under the driving of the mechanical arm, so that a side face to be marked on the workpiece faces the marking assembly, and transfer the workpiece to the predetermined position.

In some embodiments, the gripping unit includes a fixed jaw connected to the bracket; the driving piece is arranged on the bracket; the movable claw is connected with the driving piece and is connected with the bracket in a sliding way, the movable claw and the fixed claw are oppositely arranged, and the movable claw is used for being close to the fixed claw under the driving of the driving piece so as to grasp the workpiece.

In some embodiments, a groove is provided on a side of the movable jaw facing the fixed jaw, the groove being used for positioning the workpiece.

In some embodiments, the movable claw comprises a clamping jaw, the clamping jaw is connected to the bracket in a sliding manner, and the groove is formed in one side of the clamping jaw, which faces the fixed claw; the clamping jaw is connected with the clamping jaw through a connecting block, and a connecting groove is formed in the other end of the connecting block; the floating connector is movably clamped in the connecting groove and connected with the driving piece, and the floating connector is used for driving the adapter block and the clamping jaw to move under the driving of the driving piece.

In some embodiments, the transfer assembly further includes a buffer member disposed on the support and located on a side of the movable claw facing away from the fixed claw, where the buffer member is configured to abut against the movable claw when the movable claw is far away from the fixed claw.

In some embodiments, the detecting unit comprises a detecting head slidably connected to the transfer component, one end of the detecting head is used for abutting against the workpiece, and the other end of the detecting head is used for extending to the sensor when abutting against the workpiece so that the sensor senses the detecting head; and the elastic piece is sleeved on the detection head, and two ends of the elastic piece are respectively abutted with the end part of the detection head, which is used for being abutted with the workpiece, and the transfer assembly.

In some embodiments, the detecting and positioning assembly includes a signal transmitting member and a signal receiving member disposed opposite to each other, the signal transmitting member being configured to transmit a signal to the signal receiving member, the signal receiving member being electrically connected to the transferring assembly and configured to receive the signal, wherein when the transferring assembly moves the workpiece between the signal transmitting member and the signal receiving member, the signal receiving member outputs feedback to the transferring assembly based on the fact that the signal is not received, so that the transferring assembly stops driving the workpiece to move.

In some embodiments, the bearing assembly includes two bearing members arranged at intervals, each bearing member is provided with a containing groove for containing the workpiece, one bearing member is used for containing the unmarked workpiece, and the other bearing member is used for containing the marked workpiece.

Drawings

Fig. 1 is a schematic perspective view of a marking mechanism according to an embodiment of the present application.

Fig. 2 is a schematic perspective view of a transfer assembly and a sensing assembly in the marking mechanism shown in fig. 1.

Fig. 3 is a schematic perspective view of the gripping unit in the transfer unit shown in fig. 2.

Fig. 4 is a schematic perspective view of a marking device according to an embodiment of the present application.

Description of the main reference signs

Marking device 1000

Marking mechanism 100

Load bearing assembly 10

Carrier 11

Receiving groove 12

Transfer assembly 20

Mechanical arm 21

Support 22

Gripping unit 23

Fixing claw 231

Movable claw 232

Jaw 2321

Adapter block 2322

Float joint 2323

Groove 2324

Connection slot 2325

Annular groove 2326

Driving piece 233

Cushioning member 24

Sensing assembly 30

Detection unit 31

Probe 311

Elastic member 312

Sensor 32

Detection positioning assembly 40

Signal transmitting member 41

Signal receiving element 42

Marking assembly 50

Rack 200

Chassis 201

Upper cover 202

Opening 203

Safety grating 300

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "orientation" or "positional relationship" are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the application. Furthermore, in the description of the present application, it is to be noted that the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; the two components can be connected in a mechanical mode, can be electrically connected or can be communicated with each other, can be directly connected, can be indirectly connected through an intermediate medium, and can be communicated with each other inside the two components or can be in interaction relation with each other. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and 2, a marking mechanism 100 is provided in an embodiment of the present application. The marking mechanism 100 is used for marking an end face or a side face of a workpiece, wherein the workpiece may be a drill, a bar stock or the like, which has an end face or a side face marking requirement.

The marking mechanism 100 includes a carrier assembly 10, a transfer assembly 20, a sensing assembly 30, a detection positioning assembly 40, and a marking assembly 50.

The carrying assembly 10 is used for carrying workpieces, the transferring assembly 20 is arranged on one side of the carrying assembly 10, and the transferring assembly 20 is used for grabbing the workpieces on the carrying assembly 10 for transferring.

The sensing assembly 30 includes a detecting unit 31 and a sensor 32, and the detecting unit 31 and the sensor 32 are disposed on the transfer assembly 20 at intervals and can move along with the transfer assembly 20. The detecting unit 31 is electrically connected to the sensor 32, and the detecting unit 31 can approach and abut against the workpiece under the driving of the transfer assembly 20, and the detecting unit 31 sends out a sensing signal. The sensor 32 detects the external dimensions of the workpiece when receiving the signal sensed by the detecting unit 31, so that the transfer assembly 20 grips the workpiece according to the detection result of the sensor 32. The external dimensions may be the length, width, height, etc. of the workpiece.

The detecting and positioning assembly 40, the carrying assembly 10 and the transferring assembly 20 are all arranged at intervals, and the transferring assembly 20 is used for stopping moving the workpiece when the detecting and positioning assembly 40 detects that the transferring assembly 20 moves the workpiece to a preset position. The predetermined position herein refers to the position where the workpiece is to be marked.

The marking assembly 50 may be a marking machine, where the marking assembly 50 is disposed on one side of the detecting and positioning assembly 40, and the marking assembly 50 is used for marking a workpiece at a predetermined position.

When the workpiece is marked, the transfer assembly 20 is close to the workpiece on the bearing assembly 10, the detection unit 31 is abutted to the workpiece, the outline dimension of the workpiece can be detected when the sensor 32 receives a signal transmitted by the detection unit 31, so that the transfer assembly 20 accurately grabs the workpiece to be marked from the bearing assembly 10, and the grabbing precision of the workpiece is improved by the sensing assembly 30.

The transfer assembly 20 moves the workpiece to a predetermined position, and when the workpiece is detected by the detection positioning assembly 40, the transfer assembly 20 stops moving, and when the workpiece is not detected by the detection positioning assembly 40, the transfer assembly 20 adjusts the position of the workpiece so that the workpiece stops at the predetermined position. The workpiece is then marked by the marking assembly 50. By the sensing assembly 30 and the detecting and positioning assembly 40, the transferring assembly 20 can accurately grasp the workpiece and the workpiece can accurately stop at the position corresponding to the marking assembly 50, so that the marking assembly 50 can accurately print marks on the workpiece. In addition, since the marking process is automatically completed by the marking mechanism 100 without manual operation, not only is the automation level improved, but also the labor intensity of operators is reduced.

Referring to fig. 1, the carrier assembly 10 includes two carriers 11, wherein one carrier 11 is used for placing a workpiece to be marked, and the other carrier 11 is used for placing a marked workpiece. Each carrier 11 is provided with a receiving slot 12 for receiving a workpiece, in this embodiment, each carrier 11 is provided with a plurality of receiving slots 12 arranged at intervals, and a workpiece is vertically inserted into each receiving slot 12.

Referring to fig. 1 to 3, the transfer assembly 20 includes a robot arm 21, a rack 22, a gripping unit 23, and a buffer 24. The mechanical arm 21 is arranged on one side of the bearing assembly 10, the bracket 22 is connected to the mechanical arm 21, the clamping unit 23, the detecting unit 31, the sensor 32 and the buffer piece 24 are arranged on the bracket 22 at intervals, and the clamping unit 23 is used for clamping the workpiece in the bearing piece 11. The clamping unit 23 grabs the workpiece and turns over the workpiece under the drive of the mechanical arm 21 so that the end face of the workpiece faces the marking assembly 50, and then the mechanical arm 21 transfers the workpiece to a preset position through the clamping unit 23, and at the moment, the marking assembly 50 can mark the end face of the workpiece. After the end face marking operation is completed, the clamping unit 23 turns over the workpiece under the drive of the mechanical arm 21, so that the side face of the workpiece faces the marking assembly 50, and the workpiece is transferred to a preset position, so that the marking assembly 50 marks the side face of the workpiece.

The gripping unit 23 includes a fixed claw 231, a movable claw 232, and a driving piece 233. The fixed jaw 231 is connected to the support 22, the driving member 233 may be an air cylinder, the driving member 233 is disposed on the support 22, the movable jaw 232 is connected to the driving member 233 and slidably connected to the support 22, the movable jaw 232 is disposed opposite to the fixed jaw 231, and when the driving member 233 drives the movable jaw 232 to approach the fixed jaw 231, the movable jaw 232 and the fixed jaw 231 grip the workpiece on the carrier 11.

Moveable jaw 232 includes a jaw 2321, an adapter block 2322, and a floating joint 2323. Jaw 2321 is slidably connected to bracket 22, and a side of jaw 2321 facing stationary jaw 231 is provided with a groove 2324, in this embodiment, groove 2324 is a V-shaped groove. For example, when the clamping jaw 2321 and the fixing jaw 231 clamp a drill bit, since the groove 2324 is a V-shaped groove, both groove walls of the groove 2324 can accurately clamp a workpiece.

The adapter block 2322 is generally L-shaped, one end of the adapter block 2322 is connected with the clamping jaw 2321, and a connecting groove 2325 is formed in the other end of the adapter block 2322. The floating joint 2323 is movably clamped in the connecting groove 2325 and is connected with the driving piece 233, and the floating joint 2323 is used for driving the switching block 2322 and the clamping jaw 2321 to move under the driving of the driving piece 233. Specifically, the floating joint 2323 is provided with a ring groove 2326, and the floating joint 2323 is movably clamped in the connecting groove 2325 through the ring groove 2326. Because the floating joint 2323 is movably clamped to the switching block 2322, when the floating joint 2323 is clamped to the connecting groove 2325, a certain movable gap exists between the floating joint 2323 and the switching block 2322, and the driving piece 233 is not easy to be blocked when the switching block 2322 and the clamping jaw 2321 are driven to move through the floating joint 2323 due to the existence of the movable gap, so that the driving piece 233 is ensured to smoothly drive the clamping jaw 2321 to move.

The buffer member 24 may be an oil buffer, where the buffer member 24 is disposed on the support 22 and is located on a side of the movable claw 232 away from the fixed claw 231, and when the driving member 233 drives the movable claw 232 away from the fixed claw 231 to loosen a workpiece, the movable claw 232 will abut against the buffer member 24, and the buffer member 24 can make the movable claw 232 slowly abut against the support 22, so as to avoid rigid abutment between the movable claw 232 and the support 22, and further avoid vibration.

Referring to fig. 2, the detecting unit 31 includes a detecting head 311 and an elastic member 312. The detecting head 311 is slidably connected to the support 22, one end of the detecting head 311 is used for abutting against a workpiece, and the other end of the detecting head 311 is used for extending to the sensor 32 when the detecting head 311 abuts against the workpiece, so that the sensor 32 senses the detecting head 311.

The elastic member 312 may be a spring, the elastic member 312 is sleeved on the probe 311, and two ends of the elastic member 312 are respectively abutted against the end portion of the probe 311 for abutting against the workpiece and the bracket 22. When the workpiece is required to be detected, the mechanical arm 21 drives the detection unit 31 and the sensor 32 to be close to the workpiece through the support 22, and enables the detection head 311 in the detection unit 31 to be abutted against the end face of the workpiece, at the moment, the detection head 311 compresses the elastic piece 312, one end of the detection head 311, far away from the workpiece, extends to the sensor 32, so that the sensor 32 senses the detection head 311, and when the sensor 32 senses the detection head 311, the overall dimension of the workpiece can be detected, so that the mechanical arm 21 can accurately drive the clamping unit 23 to grab the workpiece.

It should be noted that, when the marking mechanism 100 marks workpieces of different lengths, the probe 311 will abut against the workpieces of different lengths, and at this time, the protruding lengths of the ends of the probe 311 far away from the workpieces are also different, and the sensor 32 can measure the lengths of the workpieces according to the protruding lengths of the sensor probe 311.

Referring to fig. 1, the detecting and positioning assembly 40 includes a signal transmitting member 41 and a signal receiving member 42. The signal emitting element 41 and the signal receiving element 42 are disposed opposite to each other, and the signal receiving element 42 is electrically connected to the transfer unit 20 and is configured to receive the signal emitted from the signal emitting element 41. When the mechanical arm 21 transfers the workpiece on the gripping unit 23 between the signal transmitting member 41 and the signal receiving member 42, the signal transmitted by the signal transmitting member 41 is blocked by the workpiece, at this time, the signal receiving member 42 cannot receive the signal, which means that the mechanical arm 21 has moved the workpiece to the predetermined position, and the signal receiving member 42 outputs feedback to the mechanical arm 21 of the transfer assembly 20 based on the fact that the signal is not received, so that the mechanical arm 21 stops driving the workpiece to move. Conversely, when the signal receiver 42 is able to receive a signal, it indicates that the workpiece is not moved to the predetermined position at this time.

The workpiece can be accurately positioned by arranging the detection positioning assembly 40, so that the mechanical arm 21 can accurately move the workpiece to a position opposite to the marking assembly 50, and the marking assembly 50 can mark the workpiece.

The working process of the marking mechanism 100 provided in the embodiment of the present application is as follows:

The mechanical arm 21 drives the detecting unit 31 to approach the workpiece through the support 22 and enables the detecting head 311 to abut against the workpiece, at this time, the elastic piece 312 is compressed, one end of the detecting head 311 away from the workpiece extends to the sensor 32, the sensor 32 senses the detecting head 311 and then completes detection of the external dimension of the workpiece, the mechanical arm 21 drives the clamping unit 23 to accurately grab the workpiece, then the mechanical arm 21 turns the workpiece to enable the end face of the workpiece to face the marking assembly 50, the workpiece is moved between the signal transmitting piece 41 and the signal receiving piece 42, at this time, the workpiece is accurately positioned to a preset position under the action of the detecting and positioning assembly 40, and the marking assembly 50 marks the end face of the workpiece.

When the end face marking of the workpiece is completed, the mechanical arm 21 turns the workpiece so that the side face of the workpiece faces the marking assembly 50, and transfers the workpiece to a predetermined position, and the marking assembly 50 marks the side face of the workpiece.

When the work is finished marking, the robot arm 21 places the work on the carrier 11 for placing the marked work by the gripping unit 23. Because the marking process is automatically completed by the marking mechanism 100, manual operation is not needed, thereby improving marking efficiency and reducing labor intensity of operators.

Referring to fig. 4, the embodiment of the application further discloses a marking device 1000, where the marking device 1000 includes a frame 200, the marking mechanism 100 provided by the above embodiment, and a security grating 300. The frame 200 includes a chassis 201 and an upper cover 202, the upper cover 202 is disposed on the top surface of the chassis 201, the marking mechanism 100 is disposed on the chassis 201 and is located inside the upper cover 202, it is understood that the upper cover 202 has an opening 203, the safety grating 300 is disposed at the opening 203 of the upper cover 202 and is spaced from the marking mechanism 100, the safety grating 300 plays a protective role, and in the working process of the marking mechanism 100, when the safety grating 300 detects that a hand of a person stretches into the upper cover 202, the marking mechanism 100 can stop or the marking device 1000 gives an alarm.

It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application.

Claims (10)

1. A marking mechanism, comprising:

The bearing assembly is used for bearing the workpiece;

The transfer assembly is arranged on one side of the bearing assembly and used for grabbing the workpiece on the bearing assembly;

The sensing assembly comprises a detection unit and a sensor which are arranged on the transfer assembly at intervals, the detection unit is electrically connected with the sensor, the detection unit is driven by the transfer assembly to approach and abut against the workpiece to send out a sensing signal, the sensor is used for receiving the sensing signal to detect the external dimension of the workpiece, and the transfer assembly grabs the workpiece according to the detection result of the sensor;

The detection positioning assembly is arranged at intervals with the bearing assembly and the transfer assembly, the detection positioning assembly is used for detecting the workpiece, and the transfer assembly stops moving the workpiece when the detection positioning assembly detects that the transfer assembly moves the workpiece to a preset position;

The marking assembly is arranged on one side of the detection positioning assembly, is arranged at intervals with the bearing assembly and the transfer assembly, and is used for marking the workpiece at the preset position.

2. The marking mechanism of claim 1, wherein the transfer assembly comprises:

the mechanical arm is arranged on one side of the bearing assembly;

the support is connected with the mechanical arm, and the detection unit and the sensor are arranged on the support;

The clamping unit is arranged on the support and is arranged with the detection unit and the sensor at intervals, and is used for clamping the workpiece, turning over the workpiece under the drive of the mechanical arm, enabling the end face to be marked on the workpiece to face the marking assembly, and transferring the workpiece to the preset position under the drive of the mechanical arm.

3. The marking mechanism as claimed in claim 2, wherein said gripping unit is further adapted to turn over said workpiece with its end face marked under the drive of said robot arm, to face a side face to be marked on said workpiece toward said marking assembly, and to transfer said workpiece to said predetermined position.

4. The marking mechanism of claim 2, wherein the gripping unit comprises:

a fixed claw connected to the bracket;

The driving piece is arranged on the bracket;

The movable claw is connected with the driving piece and is connected with the bracket in a sliding way, the movable claw and the fixed claw are oppositely arranged, and the movable claw is used for being close to the fixed claw under the driving of the driving piece so as to grasp the workpiece.

5. The marking mechanism of claim 4, wherein a side of the movable jaw facing the fixed jaw is provided with a recess for positioning the workpiece.

6. The marking mechanism of claim 5, wherein the moveable jaw comprises:

The clamping jaw is connected to the bracket in a sliding manner, and the groove is formed in one side of the clamping jaw, which faces the fixed jaw;

the clamping jaw is connected with the clamping jaw through a connecting block, and a connecting groove is formed in the other end of the connecting block;

the floating connector is movably clamped in the connecting groove and connected with the driving piece, and the floating connector is used for driving the adapter block and the clamping jaw to move under the driving of the driving piece.

7. The marking mechanism of claim 4, wherein the transfer assembly further comprises:

The buffer piece is arranged on the bracket and is positioned on one side of the movable claw, which is away from the fixed claw, and the buffer piece is used for abutting against the movable claw when the movable claw is away from the fixed claw.

8. The marking mechanism of claim 1, wherein the detection unit comprises:

The detecting head is connected to the transfer assembly in a sliding manner, one end of the detecting head is used for abutting against the workpiece, and the other end of the detecting head is used for extending to the sensor when abutting against the workpiece so that the sensor senses the detecting head;

And the elastic piece is sleeved on the detection head, and two ends of the elastic piece are respectively abutted with the end part of the detection head, which is used for being abutted with the workpiece, and the transfer assembly.

9. The marking mechanism of claim 1, wherein the detection positioning assembly comprises a signal transmitting member and a signal receiving member disposed opposite each other, the signal transmitting member configured to transmit a signal to the signal receiving member, the signal receiving member electrically connected to the transfer assembly and configured to receive the signal, wherein when the transfer assembly moves the workpiece between the signal transmitting member and the signal receiving member, the signal receiving member outputs feedback to the transfer assembly based on the absence of the signal, such that the transfer assembly ceases to move the workpiece.

10. The marking mechanism of claim 1, wherein the carrier assembly comprises:

And two bearing pieces are arranged at intervals, each bearing piece is provided with a containing groove for containing the workpiece, one bearing piece is used for containing the unmarked workpiece, and the other bearing piece is used for containing the marked workpiece.