Material transfer platform and material conveying equipment

Abstract

The invention belongs to the technical field of material conveying, and discloses a material transferring platform and a material conveying device.The material transferring platform comprises a conveying table and pushing mechanisms, the conveying table is provided with at least two machining stations, the at least two machining stations are continuously arranged in the first direction, and all the machining stations are provided with the pushing mechanisms; the pushing mechanism comprises a first baffle and a first pushing plate, the first baffle can ascend to protrude out of the table top of the conveying table or sink to be lower than the table top of the conveying table, and the first pushing plate is provided with a first working position spaced from the first baffle in the first direction. The first push plate located at the first working position can move towards the side close to the first baffle in the first direction and can cross the first baffle to move to the second working position, and when the first push plate is reset to the first working position from the second working position, the first push plate can avoid materials. According to the invention, the transferring operation of the materials does not need manual participation, so that the production efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material conveying, and in particular to a material transfer platform and material conveying equipment. Background Art

[0002] In the manufacturing process of photo frames, it is necessary to perform processing operations such as nailing on the photo frames through multiple continuous processing stations. However, in the prior art, the photo frames are generally transferred between the various processing stations by manual transportation. After the photo frames are transported to the processing stations, they are positioned by a positioning structure set at the processing stations. The whole process is time-consuming, resulting in low production efficiency.

[0003] Therefore, the above problems need to be solved urgently. Summary of the invention

[0004] The object of the present invention is to provide a material transfer platform and material conveying equipment to solve the problem that photo frames are generally transferred between various processing stations by manual transportation. After the photo frames are transported to the processing stations, they are positioned by a positioning structure arranged at the processing stations. The whole process is time-consuming, thereby resulting in low production efficiency.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In one aspect, the present invention provides a material transfer platform, comprising:

[0007] A conveying platform is provided with at least two processing stations, and at least two of the processing stations are arranged continuously along a first direction; and

[0008] Pushing mechanism, all the processing stations are provided with the pushing mechanism, the pushing mechanism includes a first baffle and a first push plate, the first baffle can be raised and lowered in the vertical direction, and can rise to protrude from the table top of the conveying platform or sink to be lower than the table top of the conveying platform, the first push plate has a first working position spaced apart from the first baffle along the first direction, the first push plate located at the first working position can move along the first direction toward the side close to the first baffle, and can move over the first baffle to the second working position when the first baffle sinks to be lower than the table top of the conveying platform, when the first push plate moves toward the side close to the first baffle, the first push plate can push the material to move, the first push plate can also be reset to the first working position from the second working position, and when the first push plate is reset to the first working position from the second working position, the first push plate can avoid the material.

[0009] Preferably, the material transfer platform also includes a positioning mechanism, and all the processing stations are provided with the positioning mechanism, the positioning mechanism includes a second push plate and a second baffle, the second push plate and the second baffle are spaced apart along a second direction, the second direction is perpendicular to the first direction, and the second push plate can approach or move away from the second baffle along the second direction.

[0010] Preferably, a push block is provided on the first push plate, and the push block is rotatably connected to the first push plate via a rotating shaft, and the axis of the rotating shaft extends along the second direction. The push block can rotate between a third working position and a fourth working position. When the push block is located at the third working position and the first push plate is located at the first working position, the distance between the push block and the table surface is smaller than the thickness of the material, and the side of the push block facing away from the first baffle abuts against the first push plate. When the first push plate is reset to the first working position from the second working position, the material can push the push block and make the push block rotate around the axis of the rotating shaft from the third working position to the fourth working position.

[0011] Preferably, a plurality of push blocks are provided on the first push plate, and the plurality of push blocks are arranged at intervals along the second direction, and when the push blocks are located at the fourth working position, the push blocks are higher than the second push plate;

[0012] The first baffle includes a plurality of baffles, and the plurality of baffles are arranged at intervals along the second direction. All the baffles are correspondingly provided with a first driving member, and the first driving member can drive the baffles to rise and fall along the vertical direction.

[0013] Preferably, the pushing mechanism further comprises a locking member, and the locking member is configured to lock the pushing block to the fourth working position.

[0014] Preferably, a placement rack is mounted on the first push plate, and the placement rack is configured to carry the locking member.

[0015] Preferably, all of the processing stations are provided with at least two processing stations, at least two of the processing stations are arranged continuously along the first direction, and all of the processing stations are provided with the pushing mechanism and the positioning mechanism.

[0016] Preferably, the material transfer platform further comprises a second driving member, all the processing stations are provided with the second driving member, and the second driving member is configured to drive all the first push plates in the same processing station to move synchronously along the first direction.

[0017] Another aspect of the present invention provides a material conveying device, comprising the material transfer platform as described above.

[0018] Preferably, the material conveying equipment further comprises a loading platform, the loading platform is connected to one side of the conveying platform along the first direction, and the loading platform is provided with the pushing mechanism.

[0019] Beneficial effects of the present invention:

[0020] In the present invention, the material transfer platform is provided with a conveying platform, and all processing stations provided on the conveying platform are provided with a pushing mechanism, which can push materials so that the materials can flow between various processing stations, and the pushing mechanism can position the materials so as to perform corresponding processing operations on the materials moved to various processing stations. As described above, in the present invention, the material transfer operation does not require manual participation, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a material transfer platform in an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of a material transfer platform excluding a mounting platform in an embodiment of the present invention;

[0023] Figure 3 It is a structural schematic diagram of a pushing mechanism, a positioning mechanism and a conveying platform at one of the processing stations in an embodiment of the present invention;

[0024] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0025] Figure 5 It is a schematic structural diagram of a pushing mechanism, a second driving member and a transmission belt in an embodiment of the present invention;

[0026] Figure 6 yes Figure 5 A partial enlarged view of point B in the middle;

[0027] Figure 7 It is a schematic structural diagram of a push block and a rotating shaft in an embodiment of the present invention.

[0028] In the figure:

[0029] 1. Conveying platform; 2. Pushing mechanism; 21. First baffle plate; 211. Baffle block; 22. First push plate; 221. Push block; 2211. Screw hole; 222. Rotating shaft; 223. Placement rack; 224. Mounting block; 23. First driving member; 24. Locking member; 3. Positioning mechanism; 31. Second push plate; 32. Second baffle plate; 33. Driving module; 41. Second driving member; 42. Transmission belt; 5. Processing station; 51. Mounting platform; 52. Processing station. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] This embodiment provides a material conveying device, which includes a material transfer platform. The material transfer platform is used to transfer materials to various processing stations. It can be understood that the material is the photo frame mentioned above.

[0035] Specifically, see Figures 1 to 7In this embodiment, the material transfer platform includes a conveying platform 1 and a pushing mechanism 2, wherein the conveying platform 1 is provided with three processing stations 5, and the three processing stations 5 are arranged continuously along a first direction, and each processing station 5 is provided with corresponding processing equipment (not shown in the figure), so as to perform different processing operations on the material. Specifically, each processing station 5 is provided with a mounting table 51, and the mounting table 51 is used to install the processing equipment. Moreover, all processing stations 5 are provided with a pushing mechanism 2, which includes a first baffle 21 and a first push plate 22. The first baffle 21 can be raised and lowered in the vertical direction, and can rise to a surface protruding from the conveyor platform 1 or sink to a surface lower than the conveyor platform 1. The first push plate 22 has a first working position spaced apart from the first baffle 21 along the first direction. The first push plate 22 located at the first working position can move along the first direction toward a side close to the first baffle 21, and can move to a second working position over the first baffle 21 when the first baffle 21 sinks to a surface lower than the conveyor platform 1. When the first push plate 22 moves toward a side close to the first baffle 21, the first push plate 22 can push the material to move.

[0036] As described above, for any processing station 5, when the first baffle 21 rises to a position protruding from the surface of the conveying platform 1, the first push plate 22 approaches the first baffle 21, so that the material can be clamped between the first push plate 22 and the first baffle 21, thereby positioning the material, so that the processing equipment set at the processing station 5 can perform corresponding processing operations on the material, and when the first baffle 21 sinks to a position lower than the surface of the conveying platform 1, since the first push plate 22 can pass over the first baffle 21, the first push plate 22 can push the material from the processing station 5 to the conveying platform 1. Specifically, the three processing stations 5 are arranged continuously along the first direction. For two adjacent processing stations 5, the pushing mechanism 2 arranged in the processing station 5 located on the upstream side can push the material to the processing station 5 located on the downstream side. For the most upstream processing station 5, the material conveying equipment can supply materials to it through a special loading device. In addition, the pushing mechanism 2 arranged in the most downstream processing station 5 can push the material out of the conveying platform 1.

[0037] That is, in this embodiment, the material is transferred to each processing station 5 in sequence along the first direction by the pushing mechanism 2, and for any processing station 5, after the first push plate 22 pushes the material that has completed the corresponding processing operation out of the processing station 5, it needs to be reset to push the next material, that is, the first push plate 22 also needs to be able to reset from the second working position to the first working position. Based on the above content, for any processing station 5, when the first push plate 22 is reset from the second working position to the first working position, since the processing station 5 has been placed with In order to prevent the first push plate 22 from pushing the material pushed out from the processing station 5 on the upstream side back to the original processing station 5, in this embodiment, when the first push plate 22 is reset from the second working position to the first working position, the first push plate 22 can avoid the material, that is, the first push plate 22 can avoid the material pushed out from the processing station 5 on the upstream side during the resetting process, thereby ensuring that the first push plate 22 can reset to the first working position after pushing out the previous material, and can position the next material, and push out the next material after completing the corresponding processing operation.

[0038] Based on the above, in this embodiment, the material transfer platform is provided with a conveyor table 1, and all processing stations 5 provided on the conveyor table 1 are provided with a pushing mechanism 2, and the pushing mechanism 2 can push materials, so that the materials can flow between the various processing stations 5, and the pushing mechanism 2 can position the materials, so as to perform corresponding processing operations on the materials moved to the various processing stations 5. As described above, in this embodiment, the material transfer operation does not require manual participation, so that the production efficiency can be improved.

[0039] It is worth noting that in other optional embodiments, the conveyor platform 1 may also be provided with two or more than four processing stations 5. The number of processing stations 5 is determined by the material processing technology, and this embodiment does not impose any specific restrictions on this.

[0040] It is also worth mentioning that, in the present embodiment, for the most upstream processing station 5, the material conveying equipment supplies materials to it through a loading platform (not shown in the figure), that is, the material conveying equipment also includes a loading platform, which is connected to one side of the conveying platform 1 along the first direction, and the processing station 5 adjacent to the loading platform is the most upstream processing station 5.

[0041] It can be understood that the loading platform is also provided with a pushing mechanism 2 , that is, in this embodiment, the loading platform also supplies materials to the most upstream processing station 5 through the pushing mechanism 2 .

[0042] In addition, in this embodiment, all processing stations 5 are provided with two processing stations 52, and the two processing stations 52 are arranged continuously along the first direction. All processing stations 52 are provided with a pushing mechanism 2. Therefore, this embodiment can transfer two materials to any processing station 5 at one time, so that the same processing operation can be performed on two materials at the same time, thereby further improving production efficiency.

[0043] Specifically, for one of the two adjacent processing stations 5 located on the upstream side, the pushing mechanism 2 arranged in the processing station 52 located on the upstream side can push the material in the processing station 52 to pass over the processing station 52 on the downstream side, and push the material to the processing station 52 located on the upstream side in the processing station 5 on the downstream side. Correspondingly, the pushing mechanism 2 arranged in the processing station 52 located on the downstream side can push the material in the processing station 52 to pass over the processing station 52 located on the upstream side in the processing station 5 on the downstream side, and push the material to the processing station 52 located on the downstream side in the processing station 5 on the downstream side.

[0044] Of course, in other optional embodiments, the processing station 5 is also provided with three or more processing stations 52, so that the same processing operation can be performed on three or more materials at the same time, thereby further improving production efficiency. This embodiment does not impose specific restrictions on this.

[0045] Furthermore, the material transfer platform also includes a positioning mechanism 3, and all processing stations 5 are provided with the positioning mechanism 3. The positioning mechanism 3 includes a second push plate 31 and a second baffle 32, and the second push plate 31 and the second baffle 32 are arranged at intervals along the second direction, and the second direction is perpendicular to the first direction. The second push plate 31 can approach or move away from the second baffle 32 along the second direction. When the second push plate 31 approaches the second baffle 32 along the second direction, the material can be clamped between the second push plate 31 and the second baffle 32, so that the material can be positioned together with the first push plate 22 and the first baffle 21, and the material can be positioned more accurately. Specifically, the positioning mechanism 3 also includes a driving module 33 for driving the second push plate 31 to move, so that the second push plate 31 can approach or move away from the second baffle 32 along the second direction. It can be understood that since the specific structure of the driving module 33 is a prior art, this embodiment will not be described in detail.

[0046] It can be understood that, based on the above-mentioned contents, in this embodiment, all processing stations 52 are also provided with positioning mechanisms 3 .

[0047] Furthermore, a push block 221 is provided on the first push plate 22, and the push block 221 is rotatably connected to the first push plate 22 via a rotating shaft 222, and the axis of the rotating shaft 222 extends along the second direction, and the push block 221 can rotate between the third working position and the fourth working position. When the push block 221 is located at the third working position and the first push plate 22 is located at the first working position, the distance between the push block 221 and the table surface is less than the thickness of the material, and the side of the push block 221 facing away from the first baffle plate 21 abuts against the first push plate 22, thereby, the first push plate 22 is moved by the first working position. When the first working position moves to the second working position, under the stop of the first push plate 22, the push block 221 arranged thereon can push the material, thereby pushing the material to the next processing station 5, and when the first push plate 22 is reset to the first working position from the second working position, new material has been placed on the processing station 5 corresponding to the first push plate 22, and the material can push the push block 221, and make the push block 221 rotate from the third working position to the fourth working position around the axis of the rotating shaft 222, thereby preventing the first push plate 22 from pushing the material back to the original processing station 5.

[0048] It can be understood that, in the present embodiment, the top of the push block 221 is rotatably connected to the first push plate 22 via the rotating shaft 222. During the process of the first push plate 22 being reset from the second working position to the first working position, when the push block 221 passes over the material pushed against it, the push block 221 can be reset to the third working position under the action of its own gravity, so that the next material can be pushed subsequently.

[0049] As described above, in this embodiment, the first push plate 22 is moved toward the first baffle plate 21 to clamp and position the material in the first direction. Accordingly, in this embodiment, the second push plate 31 is moved toward the second baffle plate 32 to clamp and position the material in the second direction. Moreover, the first push plate 22 and the first baffle plate 21 can accommodate and position materials of different sizes in the first direction. Accordingly, the second push plate 31 and the second baffle plate 32 can accommodate and position materials of different sizes in the second direction. However, in this embodiment, the first push plate 22 and the first baffle plate 21 as well as the second push plate 31 and the second baffle plate 32 are used to clamp and position the material together. Therefore, in order to avoid the second push plate 31 being unable to effectively clamp the material with the second baffle plate 32 due to interference between the push block 221 and / or the first baffle plate 21 and the second push plate 31 when the size of the material in the first direction is reduced due to the change of type, in this embodiment, a plurality of push blocks 221 are provided on the first push plate 22. The plurality of push blocks 221 are arranged at intervals along the second direction. Moreover, in the push blocks 221, the plurality of push blocks 221 are arranged at intervals along the second direction. When the first baffle plate 21 is in the fourth working position, the push block 221 is higher than the second push plate 31. In addition, the first baffle plate 21 includes a plurality of baffles 211, and the plurality of baffles 211 are arranged at intervals along the second direction. All baffles 211 are correspondingly provided with a first driving member 23, and the first driving member 23 can drive the baffles 211 to rise and fall in the vertical direction. Therefore, the present embodiment can adjust the number of push blocks 221 in the fourth working position and the number of baffles 211 that rise to protrude from the table surface of the conveying platform 1 according to the size of the material. Specifically, when the size of the material in the first direction is reduced due to the change of shape, the present embodiment can adaptively make one or more push blocks 221 close to the second push plate 31 in the second direction in the fourth working position, and adaptively make one or more baffles 211 close to the second push plate 31 in the second direction sink to below the table surface of the conveying platform 1, thereby ensuring that the second push plate 31 can move in the second direction to abut against the material, so that it can cooperate with the second baffle plate 32 to clamp the material in the second direction.

[0050] Based on the above, the material transfer platform in this embodiment is compatible with materials of different sizes, thereby meeting diverse production needs.

[0051] It is understandable that the first driving member 23 may be a linear driving structure such as a cylinder or an electric cylinder, and this embodiment does not impose any specific limitation on this.

[0052] Furthermore, the pushing mechanism 2 also includes a locking member 24, which is configured to lock the push block 221 to a fourth working position, that is, when the size of the material in the first direction is reduced due to a change in shape, the present embodiment can adaptively maintain one or more push blocks 221 close to the second push plate 31 along the second direction at the fourth working position through the locking member 24, without the need for manual support or the like.

[0053] Exemplarily, in this embodiment, the locking member 24 is a bolt, and a screw hole 2211 is provided on the push block 221. The bolt can be screwed to the push block 221 through the screw hole 2211. A mounting block 224 is fixedly connected to the first push plate 22. The push block 221 is rotatably connected to the mounting block 224 via a rotating shaft 222. When the push block 221 is located in the fourth working position, the bolt abuts against the mounting block 224, thereby enabling the push block 221 to remain in the fourth working position.

[0054] In addition, a placement rack 223 is installed on the first push plate 22, and the placement rack 223 is configured to carry locking members 24. It can be understood that the number of locking members 24 carried on the placement rack 223 is the same as the number of push blocks 221 set on the first push plate 22, so as to facilitate the staff to lock the push blocks 221.

[0055] Furthermore, based on the above-mentioned contents, the material transfer platform also includes a second driving member 41, and all processing stations 5 are provided with a second driving member 41. The second driving member 41 is configured to drive all first push plates 22 in the same processing station 5 to move synchronously along the first direction, thereby transferring two materials to the next processing station 5 at the same time.

[0056] It can be understood that the second driving member 41 is a servo motor, and the second driving member 41 is connected to all the first push plates 22 in the same processing station 5 through a transmission belt 42. This embodiment can achieve the purpose of adjustable stroke of the first push plate 22 through methods such as output torque recognition of the servo motor, thereby adjusting the moving distance of the first push plate 22 according to the size of the material, thereby adapting to the positioning and transfer of materials of different sizes.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Material transfer platform, characterized in that: include: A conveying platform (1) is provided with at least two processing stations (5), wherein at least two of the processing stations (5) are arranged continuously along a first direction; and A pushing mechanism (2), all of the processing stations (5) are provided with the pushing mechanism (2), the pushing mechanism (2) comprising a first baffle (21) and a first push plate (22), the first baffle (21) being able to be raised and lowered in a vertical direction and being able to rise to a surface protruding from the conveying platform (1) or being able to sink to a surface lower than the conveying platform (1), the first push plate (22) having a first working position spaced apart from the first baffle (21) along the first direction, the first push plate (22) being located at the first working position being able to move along the first direction toward a position close to the first baffle The first push plate (22) can move toward one side of the first baffle plate (21), and can move over the first baffle plate (21) to the second working position when the first baffle plate (21) sinks to a level below the surface of the conveying platform (1); when the first push plate (22) moves toward the side close to the first baffle plate (21), the first push plate (22) can push the material to move; the first push plate (22) can also be reset from the second working position to the first working position; when the first push plate (22) is reset from the second working position to the first working position, the first push plate (22) can avoid the material.

2. The material transfer platform according to claim 1, characterized in that: The material transfer platform also includes a positioning mechanism (3), and all the processing stations (5) are provided with the positioning mechanism (3), and the positioning mechanism (3) includes a second push plate (31) and a second baffle (32), and the second push plate (31) and the second baffle (32) are spaced apart along a second direction, and the second direction is perpendicular to the first direction, and the second push plate (31) can approach or move away from the second baffle (32) along the second direction.

3. The material transfer platform according to claim 2, characterized in that: A push block (221) is provided on the first push plate (22), and the push block (221) is rotatably connected to the first push plate (22) via a rotating shaft (222), and the axis of the rotating shaft (222) extends along the second direction. The push block (221) can rotate between a third working position and a fourth working position. When the push block (221) is located at the third working position and the first push plate (22) is located at the first working position, the distance between the push block (221) and the table surface is smaller than the thickness of the material, and the side of the push block (221) facing away from the first baffle plate (21) abuts against the first push plate (22). When the first push plate (22) is reset from the second working position to the first working position, the material can push against the push block (221) and make the push block (221) rotate from the third working position to the fourth working position around the axis of the rotating shaft (222).

4. The material transfer platform according to claim 3, characterized in that: A plurality of push blocks (221) are arranged on the first push plate (22), and the plurality of push blocks (221) are arranged at intervals along the second direction. When the push blocks (221) are located at the fourth working position, the push blocks (221) are higher than the second push plate (31); The first baffle (21) comprises a plurality of baffles (211), the plurality of baffles (211) being arranged at intervals along the second direction, all of the baffles (211) being correspondingly provided with a first driving member (23), and the first driving member (23) being capable of driving the baffles (211) to rise and fall along a vertical direction.

5. The material transfer platform according to claim 4, characterized in that: The pushing mechanism (2) further comprises a locking member (24), wherein the locking member (24) is configured to lock the pushing block (221) to the fourth working position.

6. The material transfer platform according to claim 5, characterized in that: A placement rack (223) is installed on the first push plate (22), and the placement rack (223) is configured to carry the locking member (24).

7. The material transfer platform according to claim 2, characterized in that: All of the processing stations (5) are provided with at least two processing positions (52), at least two of the processing positions (52) are arranged continuously along the first direction, and all of the processing positions (52) are provided with the pushing mechanism (2) and the positioning mechanism (3).

8. The material transfer platform according to claim 7, characterized in that: The material transfer platform also includes a second driving member (41), and all the processing stations (5) are provided with the second driving member (41), and the second driving member (41) is configured to drive all the first push plates (22) in the same processing station (5) to move synchronously along the first direction.

9. Material conveying equipment, characterized in that: It comprises a material transfer platform as described in any one of claims 1 to 8.

10. The material conveying equipment according to claim 9, characterized in that: The material conveying equipment further comprises a loading platform, the loading platform being connected to one side of the conveying platform (1) along the first direction, and the loading platform being provided with the pushing mechanism (2).

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