A conveying device and a production line to which the conveying device is applied

Abstract

This invention relates to a conveying device, comprising a conveyor line on a frame, the conveyor line including a first station at one end of the frame and a second station at the other end of the frame. The device is characterized by further including a third station located between the first and second stations. A first robotic arm is provided adjacent to the third station, and a first lifting mechanism corresponding to the first robotic arm is provided at the third station. The first lifting mechanism cooperates with the first robotic arm or the conveyor line to transfer the workpiece to be transferred. The first and second stations can be selectively used to perform loading or unloading actions opposite to those of the third station. The advantage of this invention is that the conveyor line of this device not only has a first and second station but also a third station. The first and second stations can be selectively used to perform loading or unloading actions opposite to those of the third station. Therefore, if the first station malfunctions, the second station can still operate to avoid a situation where the entire conveyor line cannot operate.

Description

Technical Field

[0001] This invention relates to the field of conveying device technology, and more particularly to a conveying device for the production of automotive parts and a production line using the conveying device. Background Technology

[0002] Currently, the production process of automotive parts often involves the processing of long strip-shaped workpieces such as I-beams. For the sake of efficiency and safety, more and more companies are starting to use automated conveying devices to complete the loading and unloading of workpieces. Commonly used automated conveying devices can be found in Chinese invention patent No. ZL202110036425.8, "Sheet Metal Cutting Device and Sheet Metal Cutting Method", or Chinese invention patent application No. CN202010285958.5 (Publication No. CN111285112A), "An Artificial Intelligence Feeding Equipment for a Wheel Production Line Rolling Machine".

[0003] Specifically, existing conveying devices typically have a conveyor line, and use both ends of the conveyor line for loading and unloading operations, which can be named the loading end and the unloading end respectively. Near the loading end and the unloading end, there are corresponding robotic arms to complete the loading and unloading actions of the workpieces. Correspondingly, the loading end and the unloading end are usually equipped with lifting mechanisms to cooperate with their respective robotic arms. That is, when the lifting mechanism is in the lifting state, it can cooperate with the robotic arm to transfer the workpiece, and when the lifting mechanism is in the lowering state, it can cooperate with the conveyor line to transfer the workpiece.

[0004] However, existing conveying devices still have the following drawbacks during implementation: First, if the robotic arm at either end malfunctions, the entire conveyor line will be unable to continue operating, requiring repair of the malfunctioning robotic arm. Second, during workpiece transport, if a defective part appears, it will be transported to the same end along with the qualified parts, increasing the workload of separation even if the defective part is marked. Third, when the robotic arm transfers the workpiece to the lifting mechanism, and when the lifting mechanism transfers the workpiece to the conveyor line, the long, narrow workpiece may sometimes become misaligned at both ends due to external force during the transfer process. Therefore, further improvements to the existing technology are needed. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a conveying device that can prevent the entire conveying line from failing to operate when a fault occurs at one end of the conveying line, in view of the above-mentioned existing technology.

[0006] The second technical problem to be solved by the present invention is to provide a conveying device that can transport qualified and unqualified parts to different positions, in view of the above-mentioned existing technology.

[0007] The third technical problem to be solved by the present invention is to provide a conveying device that can prevent workpiece misalignment during the transfer process, in view of the above-mentioned existing technology.

[0008] The fourth technical problem to be solved by the present invention is to provide a production line with a conveying device in view of the above-mentioned existing technology.

[0009] The technical solution adopted by the present invention to solve the first technical problem is as follows: the conveying device includes a frame, on which a conveyor line for conveying workpieces to be transferred is provided, the conveyor line including a first station located at one end of the frame and a second station located at the other end of the frame, characterized in that it further includes:

[0010] The third workstation is located between the first and second workstations;

[0011] A first robotic arm for loading or unloading onto the conveyor line is provided adjacent to the third workstation, and the third workstation is provided with a first lifting mechanism corresponding to the first robotic arm. The first lifting mechanism can cooperate with the first robotic arm in the lifting state, or cooperate with the conveyor line in the lowering state to transfer the workpiece to be transferred. Correspondingly, the first workstation and the second workstation can be selectively used to perform loading or unloading actions opposite to those of the third workstation.

[0012] To improve the efficiency of loading or unloading, preferably, the first and / or second workstations are equipped with a second robotic arm for loading or unloading. Correspondingly, a second lifting mechanism is also provided adjacent to the second robotic arm. The second lifting mechanism can cooperate with the second robotic arm in a lifted state, or cooperate with the conveyor line in a lowered state to transfer the workpiece to be transferred. Compared with the traditional method of loading or unloading by operators, the efficiency of using a second robotic arm in conjunction with a second lifting mechanism is higher. It should be noted that the second lifting mechanism is provided to better cooperate with the second robotic arm. Depending on actual needs, even without the second lifting mechanism, the second robotic arm can still complete the loading or unloading actions.

[0013] To enable the second lifting mechanism to transfer workpieces, preferably, the second lifting mechanism is only located at the first workstation. The second workstation is operated by personnel to perform the corresponding loading or unloading actions. The second lifting mechanism includes a first platform with a placement component for the workpiece. A first drive source connected to the first platform is mounted on the frame, driving the first platform upwards to a lifting state or downwards to a lowering state. This arrangement, with the second lifting mechanism located only at the first workstation and personnel performing the loading or unloading actions, is because the first workstation is a commonly used station, while the second workstation is only used for special situations such as transferring defective parts or when the first workstation malfunctions. Therefore, personnel can perform the loading or unloading. When the second lifting mechanism drives the first platform to the lifting state via the first drive source, it can be understood that the first platform, along with the placement component, stands independently on the conveyor line, thus avoiding interference from other components on the conveyor line and allowing the second robot to cooperate more smoothly with the first platform to complete the transfer of the workpiece.

[0014] To address the second technical problem, preferably, the workpieces to be transferred include both qualified and unqualified parts. The third station is used to feed materials onto the conveyor line. Correspondingly, the first station is used to unload qualified parts, and the second station is used to unload unqualified parts. By using a third station to feed materials onto the conveyor line, and the first station to unload qualified parts and the second station to unload unqualified parts, it means that unqualified parts can be directly separated for subsequent testing, rework, etc., without spending extra time separating unqualified parts from a large number of qualified parts, thus significantly improving work efficiency.

[0015] To enable the first lifting mechanism to transfer the workpiece, preferably, the first lifting mechanism includes a second platform with the placement component on it. A second drive source connected to the second platform is mounted on the frame, thereby driving the second platform to move upwards to a lifting state or downwards to a lowering state. Similar to the second lifting mechanism, the first lifting mechanism has a second platform, which receives the workpiece via the placement component. The second platform is connected to the second drive source to achieve the rising and lowering actions.

[0016] To facilitate material transfer from the third workstation to the conveyor line, preferably, a truss is provided above the third workstation, and the truss is equipped with a conveying mechanism for transporting the workpiece to be transferred. Correspondingly, the first robotic arm is located on the truss, thereby transferring the workpiece to be transferred from the conveying mechanism to the first lifting mechanism. The conveying mechanism on the truss is used to transport the workpiece to be transferred, for example, after undergoing the previous process, to the area above the third workstation, whereby the first robotic arm, in conjunction with the first lifting mechanism, can transfer the workpiece to the third workstation on the conveyor line.

[0017] To ensure smooth transport of the workpiece on the conveyor line, preferably, the frame has a working space in the middle for setting up the conveyor line. The conveyor line includes conveyor chains located on both sides of the working space perpendicular to the conveying direction. The placement component is provided on the conveyor chains. Correspondingly, the frame has limiting components on both sides of the working space perpendicular to the conveying direction. The two limiting components extend along the conveying direction and maintain a preset distance between them to allow the workpiece to be placed. Having limiting components on both sides of the working space perpendicular to the conveying direction ensures the correct position of the workpiece when it is fed onto the conveyor line and avoids interference with other components during subsequent transport.

[0018] To facilitate the transfer of the workpiece by the first lifting mechanism, preferably, each of the limiting members is also provided with a guide member corresponding to the position of the third station. The guide member has a guide surface extending from top to bottom and inclined towards the first lifting mechanism, thereby playing a guiding role when the first lifting mechanism descends to transfer the workpiece to the placement member located at the third station. This design takes into account that the workpiece to be transferred has a certain length. If there is any deviation, when the first lifting mechanism receives the workpiece from the first robot and descends to the conveyor line, the end of the workpiece to be transferred may sometimes interfere with the limiting member, causing the workpiece to be transferred to fail to complete the transfer correctly. Therefore, by providing the above-mentioned guide member with a guide surface, if the workpiece to be transferred deviates when it descends with the first lifting mechanism, the guide surface can contact the end of the workpiece to be transferred, guiding the workpiece to a suitable range and thus avoiding interference with the limiting member.

[0019] To address the third technical problem, the conveyor line is provided with at least two placement members spaced apart along the conveying direction for placing workpieces to be transferred. Each placement member includes at least two sub-placements spaced apart perpendicular to the conveying direction. Each sub-placement is at least partially recessed to form a groove for placing the workpiece. The bottom of the groove has an adjustment hole for mounting to the conveyor line, extending along the conveying direction. This allows the sub-placements to adjust along the conveying direction when the workpiece is transferred to one of the sub-placements, in response to the contact of the workpiece. When the workpiece contacts any of the sub-placements of the same placement member, if the two ends of the workpiece are misaligned, each sub-placement will adaptively adjust along the conveying direction to ensure the workpiece is correctly placed.

[0020] The conveying device is the conveying device as defined in any one of claims 4 to 9, and the third station of the conveying device can be used for feeding or unloading materials onto the conveying line;

[0021] When the third station is used to feed material onto the conveyor line, the following steps are included:

[0022] Step 1-1: The first robotic arm transfers the workpiece to be transferred to the first lifting mechanism;

[0023] Steps 1-2: The first lifting mechanism transfers the workpiece to be transferred to the third workstation;

[0024] Steps 1-3: Determine whether the workpiece to be transferred by the first lifting mechanism is a qualified part. If it is, it is transported to the first station via the conveyor line. If not, it is transported to the second station via the conveyor line.

[0025] When the third station is used to feed material onto the conveyor line, the following steps are included:

[0026] Step 2-1: The second robotic arm transfers the workpiece to be transferred to the second lifting mechanism;

[0027] Step 2-2: The second lifting mechanism transfers the workpiece to be transferred to the first workstation;

[0028] Steps 2-3: The workpiece to be transferred is transported to the third workstation via the conveyor line;

[0029] Step 2-4: Determine whether the second robotic arm or the second lifting mechanism has malfunctioned. If so, feed the material onto the conveyor line through the second workstation. If not, return to step 2-1.

[0030] Compared with the prior art, the advantages of the present invention are as follows: the conveyor line of the conveying device not only has a first station and a second station located at both ends, but also includes a third station located between the first station and the second station. The third station is used to feed or unload materials onto the conveyor line. The first station and the second station can be selectively used to perform the opposite feeding or unloading action to the third station. Therefore, if the first station fails, the second station can still work, thereby avoiding the situation where the entire conveyor line cannot operate. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the conveying device in Embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of the conveying device from another angle in Embodiment 1 of the present invention;

[0033] Figure 3 This is a partial enlarged view of the conveying device in Embodiment 1 of the present invention;

[0034] Figure 4 This is a schematic diagram of the truss and the first robotic arm in Embodiment 1 of the present invention;

[0035] Figure 5 This is a schematic diagram of the sub-placement component in Embodiment 1 of the present invention;

[0036] Figure 6 This is a schematic diagram of the state of the workpiece to be transferred and the sub-placement in the first state in Embodiment 1 of the present invention;

[0037] Figure 7 This is a schematic diagram of the second state of the workpiece to be transferred and the sub-placement in Embodiment 1 of the present invention;

[0038] Figure 8 This is a schematic diagram of the workpiece to be transferred and the sub-placement in the third state in Embodiment 1 of the present invention;

[0039] Figure 9 This is a schematic diagram of the first lifting mechanism in its initial state in Embodiment 1 of the present invention;

[0040] Figure 10 This is a schematic diagram of the first lifting mechanism in the lifting state in Embodiment 1 of the present invention;

[0041] Figure 11 This is a schematic diagram of the first lifting mechanism in the transfer state in Embodiment 1 of the present invention;

[0042] Figure 12 This is a schematic diagram of the first lifting mechanism in the descending state in Embodiment 1 of the present invention;

[0043] Figure 13 This is a schematic diagram of the second lifting mechanism in its initial state in Embodiment 2 of the present invention;

[0044] Figure 14 This is a schematic diagram of the second lifting mechanism in the lifting state in Embodiment 2 of the present invention;

[0045] Figure 15 This is a schematic diagram of the second lifting mechanism in a moving state in Embodiment 2 of the present invention;

[0046] Figure 16 This is a schematic diagram of the second lifting mechanism in the descending state in Embodiment 2 of the present invention. Detailed Implementation

[0047] The present invention will be further described in detail below with reference to specific embodiments.

[0048] Example 1

[0049] like Figures 1-12 The diagram shows a preferred embodiment of the present invention. See also... Figure 1In this embodiment, the conveying device includes a frame 1, on which a conveyor line 2 for conveying the workpiece A to be transferred is provided. The conveyor line 2 includes a first station 21 located at one end of the frame 1 and a second station 22 located at the other end of the frame 1. A third station 23 is also provided between the first station 21 and the second station 22. A first robotic arm 231 for feeding material onto the conveyor line 2 is provided adjacent to the third station 23, and a first lifting mechanism 232 corresponding to the first robotic arm 231 is provided at the third station 23. The first lifting mechanism 232 can cooperate with the first robotic arm 231 in the lifting state, or cooperate with the conveyor line 2 in the lowering state to transfer the workpiece A to be transferred. Correspondingly, the first station 21 and the second station 22 can be selectively used to perform the opposite unloading action to the third station 23. Specifically, in this embodiment, the first workstation 21 is equipped with a second robotic arm for unloading. Since the second robotic arm is relatively conventional, it is not shown in the accompanying drawings and will not be described further. Adjacent to the second robotic arm is a corresponding second lifting mechanism 24. The second lifting mechanism 24 can cooperate with the second robotic arm in a lifting state, or cooperate with the conveyor line 2 in a lowering state to transfer the workpiece A to be transferred. Compared to the traditional method of unloading by operators, using the second robotic arm in conjunction with the second lifting mechanism 24 is more efficient. It should be noted that the second lifting mechanism 24 is provided to better cooperate with the second robotic arm; even without the second lifting mechanism 24, the second robotic arm can still complete the unloading action according to actual needs. The aforementioned second lifting mechanism 24 includes a first platform 241, on which a placement component 25 for placing the workpiece A to be transferred is provided. The frame 1 is equipped with a first drive source 242 connected to the first platform 241, thereby driving the first platform 241 to move upward to the lifting state or downward to the lowering state. When the second lifting mechanism 24 drives the first platform 241 to rise to the lifting state via the first drive source 242, it can be understood that the first platform 241, together with the placement component 25, stands independently on the conveyor line 2. This avoids interference from other components on the conveyor line 2 with the second robot arm, allowing the second robot arm to cooperate more smoothly with the first platform 241 to complete the transfer of the workpiece A. In this embodiment, the second station 22 is operated by a worker to perform the corresponding unloading action. This is because the second station 22 is relatively infrequently used, so it is sufficient for the worker to perform the unloading.

[0050] Regarding the specific function and structure of the third station 23, the aforementioned workpiece A to be transferred includes qualified and unqualified parts. The third station 23 is used to feed materials onto the conveyor line 2. Correspondingly, the first station 21 is used to unload qualified parts, and the second station 22 is used to unload unqualified parts. By using the third station 23 to feed materials onto the conveyor line 2, and the first station 21 to unload qualified parts, and the second station 22 to unload unqualified parts, it means that unqualified parts can be directly separated for subsequent testing, rework, etc., without spending extra time separating unqualified parts from a large number of qualified parts, thus greatly improving work efficiency. Specifically, the first lifting mechanism 232 includes a second platform 233, on which a placement part 25 is provided. The frame 1 is provided with a second drive source 234 connected to the second platform 233, thereby driving the second platform 233 to move upward to the lifting state or downward to the lowering state. Figure 4 As shown, a truss 26 is provided above the third station 23. The truss 26 is equipped with a conveying mechanism for transporting the workpiece A to be transferred. Correspondingly, a first robotic arm 231 is located on the truss 26 to transfer the workpiece A from the conveying mechanism to the first lifting mechanism 232. The conveying mechanism on the truss 26 is used to transport the workpiece A, which has undergone the previous process, to above the third station 23. Then, the first robotic arm 231, in conjunction with the first lifting mechanism 232, can transfer the workpiece A to the third station 23 of the conveyor line 2.

[0051] like Figure 2 As shown, considering that the workpiece A to be transferred in this embodiment has a certain length, the middle part of the frame 1 has a working space 11 for setting up the conveyor line 2. The conveyor line 2 includes a conveyor chain 27 located on both sides of the working space 11 perpendicular to the conveying direction. Placement parts 25 are provided on the conveyor chain 27. Correspondingly, the frame 1 has limiting parts 12 on both sides of the working space 11 perpendicular to the conveying direction. The two limiting parts 12 extend along the conveying direction and maintain a preset distance d between the two limiting parts 12 for placing the workpiece A to be transferred. In this embodiment, the length of the workpiece A to be transferred is 1640mm, and the preset distance d is 1646mm. The limiting parts 12 on both sides of the working space 11 perpendicular to the conveying direction can ensure that the position of the workpiece A to be transferred is correct when feeding it onto the conveyor line 2, and can avoid interference with other components during subsequent conveying. Figure 3As shown, each limiting member 12 is also provided with a guide member 13 at the position corresponding to the third station 23. The guide member 13 has a guide surface 131 extending from top to bottom and inclined towards the first lifting mechanism 232, thereby playing a guiding role when the first lifting mechanism 232 descends to transfer the workpiece A to be transferred to the placement member 25 located at the third station 23. This design takes into account that the workpiece A to be transferred in this embodiment has a certain length. If there is a deviation, when the first lifting mechanism 232 receives the workpiece A to be transferred from the first robot 231 and descends to the conveyor line 2, the end of the workpiece A to be transferred may sometimes interfere with the limiting member 12, causing the workpiece A to be transferred to fail to complete the transfer correctly. Therefore, the guide member 13 with the guide surface 131 is provided so that if the workpiece A to be transferred deviates when it descends with the first lifting mechanism 232, the guide surface 131 can contact the end of the workpiece A to be transferred, guiding the workpiece A to a suitable range to avoid interference with the limiting member 12. Finally, as Figure 5 As shown, the conveyor line 2 is provided with at least two placement members 25 for placing workpieces A to be transferred along the conveying direction. Each placement member 25 includes at least two sub-placement members 251 spaced apart along a direction perpendicular to the conveying direction. Each sub-placement member 251 is at least partially recessed to form a groove 252 for placing the workpiece A. The bottom of the groove 252 has an adjustment hole 253 for mounting to the conveyor line 2. The adjustment hole 253 extends along the conveying direction of the conveyor line 2, so that when the workpiece A is transferred to the sub-placement member 251, the sub-placement member 251 can be adjusted along the conveying direction of the conveyor line 2 under the contact of the workpiece A. When the workpiece A contacts each of the sub-placement members 251 of the same placement member 25, if the two ends of the workpiece A are offset, each sub-placement member 251 will adaptively adjust along the conveying direction to ensure that the workpiece A is correctly placed. The conveying device in this embodiment is also applied in a production line. When the production line is used to feed material onto the conveyor line 2 at the third station 23, the following steps are included:

[0052] Step 1-1: The first robotic arm 231 transfers the workpiece A to be transferred to the first lifting mechanism 232;

[0053] Steps 1-2: The first lifting mechanism 232 transfers the workpiece A to be transferred to the third station 23;

[0054] Steps 1-3: Determine whether the workpiece A to be transferred by the first lifting mechanism 232 is a qualified part. If it is, it is transported to the first station 21 via the conveyor line 2. If not, it is transported to the second station 22 via the conveyor line 2.

[0055] The specific usage process of the conveying device in this embodiment is as follows:

[0056] Regarding the function of placement component 25, such as Figure 6 As shown, the two ends of the workpiece A to be transferred are offset, so it cannot be directly placed in the groove 252 of the sub-placement 251. However, due to the function of the adjustment hole 253, as described above, Figure 7 As shown, each sub-placement 251, encountering resistance from the workpiece to be transferred, begins to adaptively adjust along the conveying direction, and finally... Figure 8 As shown, the workpiece A to be transferred smoothly enters the groove 252 of each sub-placement 251.

[0057] For the work process of the third workstation 23, please refer to... Figure 9 At this point, the first lifting mechanism 232 is in its initial state, and the arrow in the figure indicates the subsequent direction of movement of the first lifting mechanism 232; as shown... Figure 10 As shown, the second drive source 234 drives the second platform 233 of the first lifting mechanism 232 to rise to the lifting state. The arrow in the figure indicates the subsequent direction of movement of the first robotic arm 231; Figure 11 As shown, the first robotic arm 231, along with the workpiece A to be transferred, descends to dock with the second platform 233, transferring the workpiece A onto the sub-placement 251 of the second platform 233. The arrow in the figure indicates the subsequent direction of movement of the first lifting mechanism 232; finally, as... Figure 12 As shown, the second platform 233 descends and transfers the workpiece A to be transferred to the sub-placement 251 of the third station 23; then it is determined whether the workpiece A transferred by the first lifting mechanism 232 is a qualified part. If it is, it is transported to the first station 21 through the conveyor line 2; if not, it is transported to the second station 22 through the conveyor line 2.

[0058] Example 2

[0059] The process is basically the same as in Embodiment 1, except that in this embodiment, the third station 23 is used to unload materials onto the conveyor line 2, the first station 21 is mainly used to load materials onto the conveyor line 2, and the second station 22 is a spare station for loading materials onto the conveyor line 2. Therefore, when the production line using the conveying device in this embodiment unloads materials onto the conveyor line 2 at the third station 23, the following steps are included:

[0060] Step 2-1: The second robotic arm transfers the workpiece A to be transferred to the second lifting mechanism 24;

[0061] Step 2-2: The second lifting mechanism 24 transfers the workpiece A to be transferred to the first station 21;

[0062] Steps 2-3: The workpiece A to be transferred is transported to the third station 23 via conveyor line 2;

[0063] Step 2-4: Determine whether the second robotic arm or the second lifting mechanism 24 has malfunctioned. If so, feed the material to the conveyor line 2 through the second workstation 22. If not, return to step 2-1.

[0064] The specific usage process of the second lifting mechanism 24 in this embodiment is as follows:

[0065] like Figure 13 As shown, the second robotic arm places the workpiece A to be transferred above the first station 21. The second lifting mechanism 24 is in its initial state at this time. The arrow in the figure indicates the subsequent direction of movement of the second lifting mechanism 24; as shown... Figure 14 As shown, the first drive source 242 drives the first platform 241 to rise, transferring the workpiece A to be transferred onto the sub-placement 251 of the first platform 241. The arrow in the figure indicates the subsequent direction of the second lifting mechanism 24. Figure 15 As shown, in this embodiment, the first platform 241 can move along the conveying direction toward the third station 23, thereby aligning with the sub-placement 251 on the lower conveyor line 2. The arrow in the figure indicates the subsequent movement direction of the second lifting mechanism 24; finally, as shown... Figure 16 As shown, the first platform 241 descends to connect with the conveyor line 2, transferring the workpiece A to be transferred from the third station 23 to the conveyor line 2.

Claims

1. A conveying device comprising a frame (1) on which a conveyor line (2) for conveying a workpiece (A) to be transferred is provided, the conveyor line (2) comprising a first station (21) located at one end of the frame (1) and a second station (22) located at the other end of the frame (1), characterized in that, It also includes: The third workstation (23) is located between the first workstation (21) and the second workstation (22); A first robotic arm (231) for loading or unloading materials onto the conveyor line (2) is provided adjacent to the third station (23), and a first lifting mechanism (232) corresponding to the first robotic arm (231) is provided at the third station (23). The first lifting mechanism (232) can cooperate with the first robotic arm (231) in the lifting state or cooperate with the conveyor line (2) in the lowering state to transfer the workpiece (A) to be transferred. Correspondingly, the first station (21) and the second station (22) can be selectively used to perform loading or unloading actions opposite to those of the third station (23). The workpiece (A) to be transferred includes qualified parts and unqualified parts. The third station (23) is used to load materials onto the conveyor line (2), and correspondingly, the first station (21) is used to unload qualified parts, and the second station (22) is used to unload unqualified parts.

2. The conveying device according to claim 1, characterized in that: The first station (21) and / or the second station (22) are provided with a second robot for loading or unloading. Correspondingly, a second lifting mechanism (24) is provided adjacent to the second robot. The second lifting mechanism (24) can cooperate with the second robot in the lifting state or cooperate with the conveyor line (2) in the lowering state to transfer the workpiece (A) to be transferred.

3. The conveying device according to claim 2, characterized in that: The second lifting mechanism (24) is only located at the first workstation (21). The second workstation (22) is used by operators to perform corresponding loading or unloading actions. The second lifting mechanism (24) includes a first platform (241). The first platform (241) is provided with a placement part (25) for placing the workpiece (A) to be transferred. The frame (1) is provided with a first drive source (242) connected to the first platform (241), thereby driving the first platform (241) to move upward to the lifting state or downward to the lowering state.

4. The conveying device according to claim 3, characterized in that: The first lifting mechanism (232) includes a second platform (233), on which the placement component (25) is provided, and the frame (1) is provided with a second drive source (234) connected to the second platform (233), thereby driving the second platform (233) to move upward to the lifting state or downward to the lowering state.

5. The conveying device according to claim 4, characterized in that: A truss (26) is provided above the third work station (23). A conveying mechanism for conveying the workpiece (A) to be transferred is provided on the truss (26). Correspondingly, the first robot (231) is located on the truss (26) to transfer the workpiece (A) to be transferred on the conveying mechanism to the first lifting mechanism (232).

6. The conveying device according to claim 5, characterized in that: The frame (1) has a working space (11) in the middle for setting up the conveyor line (2). The conveyor line (2) includes a conveyor chain (27) located on both sides of the working space (11) perpendicular to the conveying direction. The placement member (25) is provided on the conveyor chain (27). Correspondingly, the frame (1) is provided with limiting members (12) on both sides of the working space (11) perpendicular to the conveying direction. The two limiting members (12) extend along the conveying direction and maintain a preset distance (d) between the two limiting members (12) for placing the workpiece (A) to be transferred.

7. The conveying device according to claim 6, characterized in that: Each of the limiting members (12) is also provided with a guide member (13) at the position corresponding to the third station (23). The guide member (13) has a guide surface (131) that extends from top to bottom and is inclined toward the first lifting mechanism (232), so as to guide when the first lifting mechanism (232) descends to transfer the workpiece (A) to be transferred to the placement member (25) located at the third station (23).

8. The conveying device according to any one of claims 3 to 7, characterized in that: The conveyor line (2) is provided with at least two placement members (25) for placing workpieces (A) to be transferred along the conveying direction. Each placement member (25) includes at least two sub-placement members (251) spaced apart along the conveying direction perpendicular to the conveying direction. Each sub-placement member (251) is at least partially recessed to form a groove (252) for placing the workpieces (A) to be transferred. The bottom of the groove (252) is provided with an adjustment hole (253) for mounting to the conveyor line (2). The adjustment hole (253) extends along the conveying direction of the conveyor line (2), so that when the workpieces (A) to be transferred are transferred to the sub-placement members (251), the sub-placement members (251) can be adjusted along the conveying direction of the conveyor line (2) under the resistance of the workpieces (A) to be transferred.

9. A production line comprising a conveying device for conveying a workpiece (A) to be transferred, characterized in that: The conveying device is the conveying device as defined in any one of claims 4 to 8, and the third station (23) of the conveying device can be used to feed or unload materials onto the conveying line (2); When the third station (23) is used to feed materials onto the conveyor line (2), the following steps are included: Step 1-1: The first robotic arm (231) transfers the workpiece (A) to be transferred to the first lifting mechanism (232); Steps 1-2: The first lifting mechanism (232) transfers the workpiece (A) to be transferred to the third station (23); Steps 1-3: Determine whether the workpiece (A) to be transferred by the first lifting mechanism (232) is a qualified part. If it is, it is transported to the first station (21) through the conveyor line (2). If not, it is transported to the second station (22) through the conveyor line (2). When the third station (23) is used to feed materials into the conveyor line (2), the following steps are included: Step 2-1: The second robotic arm transfers the workpiece (A) to be transferred to the second lifting mechanism (24); Step 2-2, the second lifting mechanism (24) transfers the workpiece (A) to be transferred to the first station (21); Steps 2-3: The workpiece (A) to be transferred is transported to the third station (23) via the conveyor line (2); Step 2-4: Determine whether the second robotic arm or the second lifting mechanism (24) has malfunctioned. If so, feed the material to the conveyor line (2) through the second workstation (22). If not, return to step 2-1.

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