Automatic disassembling and assembling equipment for PCB carrier
By designing the automatic disassembly and assembly equipment of PCB vehicles, and using conveyor components, disassembly and assembly components and vehicle input and output components to achieve automatic disassembly and assembly, the problem of low disassembly and assembly efficiency in the existing technology is solved, and production efficiency and quality control are improved.
Patent Information
- Application Number
- CN202422106103.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-08-28
AI Technical Summary
In the prior art, the disassembly and assembly efficiency of PCB vehicles is low and cannot meet the automated production requirements of modern factories. Manual disassembly and assembly can easily lead to poor PCB products in the vehicle and the vehicle, increasing production costs.
An automatic disassembly and assembly equipment for PCB vehicles is designed, including conveying components, disassembly and assembly components and vehicle input and output components. The automatic disassembly and assembly of PCB vehicles is realized through a multi-axis handling mechanism and telescopic cylinder, and combined with detection components and NG pallet components, it realizes automatic detection and recycling of defective products.
It improves the disassembly and assembly efficiency of PCB vehicles, realizes automated production, reduces manual errors, reduces production costs, and improves production efficiency and quality control.
Smart Images

Figure CN222944928U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of automated production equipment, and in particular relates to automatic disassembly and assembly equipment for PCB carriers. Background Art
[0002] During PCB production, corresponding carriers are generally required to fix the PCB. PCB carriers generally include sub-carriers and mother carriers. When circulating on the production line, they often need to be assembled or disassembled according to the production process. Most of the carriers on the market can be disassembled manually, which not only has low production efficiency and does not meet the automated production requirements of modern factories; manual disassembly is also prone to cause defects in the carrier and the PCB products inside the carrier due to manual violent disassembly, resulting in a sharp increase in production costs.
[0003] Therefore, the prior art has defects. Utility Model Content
[0004] The purpose of the utility model is to overcome the disadvantage of low disassembly and assembly efficiency in the above-mentioned prior art, and to provide an automatic disassembly and assembly device for a PCB carrier.
[0005] The utility model is implemented as follows: a PCB carrier automatic disassembly and assembly device, comprising:
[0006] A conveying assembly, comprising a first conveying track and a positioning mechanism, wherein the first conveying track is used to dock with an upstream device to transport a PCB carrier to be disassembled or a mother carrier to be assembled, or dock with a downstream device to transport an assembled PCB carrier or a disassembled mother carrier, and the positioning mechanism positions the PCB carrier or the mother carrier during the process of transporting the PCB carrier or the mother carrier on the first conveying track;
[0007] The disassembly assembly comprises a loading and unloading clamping claw mechanism and a multi-axis transport mechanism for driving the loading and unloading clamping claw mechanism to move, wherein the loading and unloading clamping claw mechanism is used to disassemble the sub-carrier in the PCB carrier from the mother carrier from the first conveying track, or to assemble the sub-carrier into the mother carrier to reassemble into a complete PCB carrier;
[0008] The carrier input and output assembly includes a second conveying track and a side-pushing mechanism. The second conveying track is used to convey sub-carriers that have been disassembled or are to be assembled. The loading and unloading gripper mechanism moves the sub-carriers disassembled from the mother carrier to the second conveying track, or moves the sub-carriers to be assembled from the second conveying track to the position of the first conveying track for assembly with the mother carrier. The side-pushing mechanism positions the sub-carriers during the transportation of the sub-carriers on the second conveying track.
[0009] Furthermore, the first conveying track includes two parallel first side plates, and first conveyor belts are provided on opposite sides of the two first side plates. Both sides of the PCB carrier or both sides of the mother carrier are respectively abutted against the two first conveyor belts.
[0010] Furthermore, the positioning mechanism includes a plurality of horizontally arranged first telescopic cylinders, and the plurality of first telescopic cylinders are located on one of the first side plates. When positioning the PCB carrier or the mother carrier, the first telescopic cylinders extend the output shaft and push the PCB carrier or the mother carrier toward the other first side plate until the PCB carrier or the mother carrier abuts against the other first side plate.
[0011] Furthermore, a lifting mechanism is provided between the two first side plates, and the lifting mechanism includes a bottom plate, which is arranged below the first conveyor belt. A plurality of ejectors that can be lifted and lowered in the vertical direction are provided on the bottom plate. When the PCB carrier is disassembled, the ejectors move upward to lift the sub-carrier from the mother carrier to a certain height, so that it is separated from the mother carrier.
[0012] Furthermore, the multi-axis transport mechanism includes an X-axis movable guide rail assembly, a Y-axis movable guide rail assembly and a Z-axis movable guide rail assembly which are mutually cooperatively connected.
[0013] Furthermore, the second conveying track includes two parallel second side plates, and second conveyor belts are disposed on opposite sides of the two second side plates, and two sides of the sub-carrier are respectively in contact with the two second conveyor belts.
[0014] Furthermore, the side-thrust mechanism includes a plurality of horizontally arranged second telescopic cylinders, and the plurality of second telescopic cylinders are located on one of the second side plates. When positioning the mother-child carrier, the second telescopic cylinder extends the output shaft and pushes the mother-child carrier toward the other second side plate until the child carrier abuts against the other second side plate.
[0015] Furthermore, it also includes a detection component, which includes a carrier photographing component and a camera photographing and code reading component. The carrier photographing component is arranged above the first conveying track, and is used to take pictures and detect the materials on the disassembled mother carrier. The camera photographing and code reading component is arranged above the second conveying track, and is used to read the codes of the input and output sub-carriers.
[0016] Furthermore, it also includes an NG tray assembly, which includes a movable carrier plate for storing NG defective PCB carriers. When the carrier camera assembly detects that the material on the mother carrier is NG material, the loading and unloading clamping mechanism will reinstall the separated sub-carriers onto the mother carrier, reassemble them into a complete PCB carrier and transport them to the carrier plate.
[0017] The utility model provides an automatic PCB carrier disassembly and assembly device. When disassembling the PCB carrier, the PCB carrier to be disassembled is transported by a conveying assembly, the disassembly and assembly assembly detaches a sub-carrier in the PCB carrier from a mother carrier and transports the sub-carrier to a carrier input-output assembly for unloading, and the mother carrier is unloaded directly from the conveying assembly; when assembling the PCB carrier, the mother carrier to be assembled is transported by the conveying assembly, the sub-carrier to be assembled is loaded from the carrier input-output assembly, the disassembly and assembly assembly transports the sub-carrier on the carrier input-output assembly to the conveying assembly to assemble it with the mother carrier into a complete PCB carrier, and unloads it from the conveying assembly. The whole process has a high degree of automation, can simultaneously meet the two working processes of disassembly and assembly of the PCB carrier, and greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.
[0020] Figure 1 It is a structural schematic diagram provided by the utility model.
[0021] Figure 2 It is a structural schematic diagram of the conveying component in the utility model.
[0022] Figure 3 It is a structural schematic diagram of the disassembly and assembly components in the utility model.
[0023] Figure 4 yes Figure 3 A partial enlarged view of middle A.
[0024] Figure 5 It is a structural schematic diagram of the input and output components of the vehicle in the utility model.
[0025] Figure 6 It is a structural schematic diagram of the NG tray assembly in the utility model.
[0026] Explanation of the reference numerals: 1. Conveying assembly; 11. First conveying track; 111. First side plate; 112. First conveyor belt; 12. Positioning mechanism; 13. Lifting mechanism; 131. Bottom plate; 132. Ejector pin; 2. Assembly and disassembly assembly; 21. Clamping mechanism; 211. Clamping jaws; 22. Multi-axis transport mechanism; 221. X-axis moving guide rail assembly; 222. Y-axis moving guide rail assembly; 223. Z-axis moving guide rail assembly; 3. Carrier input and output assembly; 31. Second conveying track; 311. Second side plate; 312. Second conveyor belt; 32. Side pushing mechanism; 4. Carrier photographing assembly; 41. Transfer slide rail; 42. Photo camera; 43. Light source mechanism; 5. Camera photographing and code reading assembly; 6. NG tray assembly; 61. Carrier plate. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0028] See also Figure 1-Figure 6 , which is a PCB carrier automatic disassembly and assembly device disclosed in the utility model, mainly includes: a conveying component 1, a disassembly and assembly component 2 and a carrier input and output component 3. The three cooperate with each other to simultaneously complete the disassembly and assembly process of the PCB carrier, as follows:
[0029] The conveying assembly 1 includes a first conveying track 11 and a positioning mechanism 12. The first conveying track 11 is used to dock with upstream equipment to transport PCB carriers to be disassembled or mother carriers to be assembled, or dock with downstream equipment to transport assembled PCB carriers or disassembled mother carriers. Specifically, the first conveying track 11 includes two parallel first side plates 111. The first conveyor belts 112 are provided on opposite sides of the two first side plates 111. The first conveyor belts 112 are preferably driven by roller assemblies. The two sides of the PCB carrier or the two sides of the mother carrier are respectively abutted against the two first conveyor belts 112. The transmission of the first conveyor belts 112 can drive the movement of the PCB carrier or the mother carrier.
[0030] The positioning mechanism 12 positions and fixes the PCB carrier or the mother carrier during the process of transporting the PCB carrier or the mother carrier on the first conveying track 11. Specifically, the positioning mechanism 12 includes a plurality of horizontally arranged first telescopic cylinders, which are located on one of the first side plates 111. When positioning the PCB carrier or the mother carrier, the first telescopic cylinders extend the output shaft and push the PCB carrier or the mother carrier to move toward the other first side plate 111 until the PCB carrier or the mother carrier abuts against the other first side plate 111. A position sensor may be provided at a certain position of the first conveyor belt 112. When it is sensed that the PCB carrier or the mother carrier has reached the disassembly position or the assembly position, the first conveyor belt 112 stops transmitting, and several of the first telescopic cylinders simultaneously extend their output shafts, so that the PCB carrier or the mother carrier abuts against the position of the other first side plate 111. Preferably, in order to increase the contact area with the PCB carrier or the mother carrier to improve the positioning effect, a top plate may be connected to the output shaft of each first telescopic cylinder, that is, the PCB carrier or the mother carrier is positioned between the other first side plate 111 and the top plate to complete the positioning, thereby facilitating subsequent disassembly and assembly operations.
[0031] Furthermore, in order to improve the success rate of disassembling the PCB carrier, a lifting mechanism 13 is provided between the two first side plates 111. The lifting mechanism 13 includes a bottom plate 131. The bottom plate 131 is arranged below the first conveyor belt 112. The bottom plate 131 is provided with a plurality of ejector pins 132 that can be lifted and lowered in the vertical direction. When disassembling the PCB carrier, the ejector pins 132 move upward to lift the sub-carrier from the mother carrier to a certain height, so that the sub-carrier is separated from the mother carrier, thereby realizing the first pre-separation of the sub-carrier and the mother carrier, which is convenient for the subsequent complete separation of the sub-carrier and the mother carrier.
[0032] The disassembly assembly 2 includes a loading and unloading clamping claw mechanism 21 and a multi-axis conveying mechanism 22 for driving the loading and unloading clamping claw mechanism 21 to move. The loading and unloading clamping claw mechanism 21 is used to disassemble the sub-carrier in the PCB carrier from the mother carrier from the first conveying track 11, or to assemble the sub-carrier into the mother carrier to reassemble into a complete PCB carrier. The multi-axis conveying mechanism 22 includes an X-axis moving guide rail assembly 221, a Y-axis moving guide rail assembly 222, and a Z-axis moving guide rail assembly 223 that are mutually connected. In this solution, the connection order between the X-axis moving guide rail assembly 221, the Y-axis moving guide rail assembly 222, and the Z-axis moving guide rail assembly 223 is not limited. In this embodiment, it is preferred that the X-axis movable guide assembly 221 and the Y-axis movable guide assembly 222 are driving structures in the horizontal direction, and the Z-axis movable guide assembly 223 is a driving structure in the vertical direction, and the Z-axis movable guide assembly 223 is connected to the Y-axis movable guide assembly 222, and the Y-axis movable guide assembly 222 is connected to the X-axis movable guide assembly 221, and the loading and unloading clamping claw mechanism 21 is arranged on the Z-axis movable guide assembly 223, and the X-axis movable guide assembly 221, the Y-axis movable guide assembly 222 and the Z-axis movable guide assembly 223 all include movable guide rails and sliders slidably connected to the movable guide rails, and the loading and unloading clamping claw mechanism 21 includes two clamping claws 211 that can open and close with each other, and the two clamping claws 211 can grasp the sub-carrier by moving toward each other at the same time, and on the contrary, the two clamping claws 211 can release the sub-carrier by moving away from each other at the same time, thereby realizing the picking and placing of the sub-carrier.
[0033] The carrier input and output assembly 3 includes a second conveying track 31 and a side push mechanism 32. The second conveying track 31 is used to convey sub-carriers that have been disassembled or are to be assembled. The loading and unloading claw mechanism 21 moves the sub-carrier disassembled from the mother carrier to the second conveying track 31, or moves the sub-carrier to be assembled from the second conveying track 31 to the position of the first conveying track 11 for assembly with the mother carrier. The side push mechanism 32 positions the sub-carrier during the transportation of the sub-carrier on the second conveying track 31. The second conveying track 31 is specifically consistent with the structure of the first conveying track 11, including two parallel second side plates 311, and the opposite sides of the two second side plates 311 are each provided with a second conveyor belt 312, and the two sides of the sub-carrier are respectively abutted against the two second conveyor belts 312. The side-pushing mechanism 32 is also consistent with the structure of the positioning mechanism 12, and includes a plurality of horizontally arranged second telescopic cylinders, and the plurality of second telescopic cylinders are located on one of the second side plates 311. When positioning the mother-child carrier, the second telescopic cylinder extends the output shaft and pushes the mother-child carrier to move toward the other second side plate 311 until the child carrier abuts against the other second side plate 311, thereby achieving the positioning of the child carrier.
[0034] Preferably, in order to improve the compatibility of the entire disassembly and assembly equipment, slide rails are connected between the two first side panels 111 and between the two second side panels 311. The distance between the two first side panels 111 and the distance between the two second side panels 311 can be adjusted according to the size of different carriers. It can be adapted to different carriers and has high versatility and compatibility.
[0035] Furthermore, a detection component is also included, and the detection component includes a carrier photographing component 4 and a camera photographing and code reading component 5. Specifically, the carrier photographing component 4 is arranged above the first conveying track 11, and is used to take photos and detect the materials on the disassembled mother carrier. In order to be able to align the materials for photographing and detecting, the carrier photographing component 4 preferably includes a transfer slide 41, and the transfer slide 41 is connected to a camera 42 and a light source mechanism 43. The light source mechanism 43 and the camera 42 are synchronously moved through the transfer slide 41, and the light source mechanism 43 can provide a light source for the camera 42, so that the camera 42 can perform more accurate photographing and detecting operations on the materials, thereby improving the accuracy of the detection. At the same time, it also includes an NG tray component 6, which includes a movable carrier 61. The carrier 61 is used to store NG defective PCB carriers. When the carrier camera component 4 detects that the material on the mother carrier after the sub-carrier is separated is NG material, the loading and unloading clamping mechanism 21 will reinstall the separated sub-carriers onto the mother carrier, reassemble them into a complete PCB carrier and transport them to the carrier 61 for storage, thereby realizing NG / OK detection of PCB carriers and automatically sorting defective products. When a sufficient amount of NG defective PCB carriers are stored on the carrier 61, the carrier 61 can be directly pulled manually to recycle N defective PCB carriers.
[0036] In addition, the camera and code reading component 5 is arranged above the second conveying track 31, and is used to read the input and output sub-carriers. It can quickly identify and decode the barcode or QR code on the sub-carrier. These barcodes or QR codes usually contain the identity information of the sub-carrier, such as production batch, serial number, customer information, etc., and can quickly identify the type information of the PCB carrier being processed at this time, reducing errors and time consumption in manual input, and improving overall production efficiency.
[0037] When disassembling the PCB carrier, the PCB carrier to be disassembled is transmitted from the upstream equipment to the first conveyor belt 112 in the conveying assembly 1, and the PCB carrier to be disassembled is moved to the position corresponding to the lifting mechanism 13 through the transmission of the first conveyor belt 112. At this time, the first telescopic cylinder is started to abut and position the PCB carrier to be disassembled. After ensuring that the position of the PCB carrier to be disassembled is fixed, the ejector pin 132 in the lifting mechanism 13 rises until it passes through the mother carrier to lift the sub-carrier, so that the sub-carrier is pre-separated from the mother carrier, and then the loading and unloading claw mechanism 21 moves to the corresponding position of the sub-carrier under the mutual cooperation of the X-axis moving guide rail assembly 221, the Y-axis moving guide rail assembly 222 and the Z-axis moving guide rail assembly 223, and clamps the sub-carrier, so that the sub-carrier is completely separated from the mother carrier. At this time, the loading and unloading claw mechanism 21 moves the sub-carrier to the second conveyor belt 312, and the second conveyor belt 312 unloads the disassembled sub-carrier. For the mother carrier, after the sub-carrier is separated from the mother carrier, the carrier camera component 4 simultaneously takes photos and detects the material in the mother carrier. If the detection result is OK, the mother carrier is directly transported by the first conveyor belt 112 to the downstream equipment for unloading. If the detection result is NG, the loading and unloading claw mechanism 21 returns to the corresponding position of the mother carrier, and reinstalls the separated sub-carrier onto the mother carrier, so that it is reassembled into a complete PCB carrier and transported to the carrier board 61 to realize the recycling of defective products.
[0038] When assembling PCB carriers, the mother carrier to be assembled is transferred from the upstream equipment to the first conveyor belt 112 in the conveying component 1. At the same time, the sub-carrier to be assembled is also transported to the position through the second conveyor belt 312. At this time, the first telescopic cylinder is started to abut and position the mother carrier to be assembled. After ensuring that the position of the mother carrier to be assembled is fixed, the carrier camera component 4 takes a photo to detect the material in the mother carrier. If the detection result is OK, the loading and unloading clamping mechanism 21 moves to the sub-carrier corresponding to the second conveyor belt 312 under the cooperation of the X-axis moving guide rail component 221, the Y-axis moving guide rail component 222 and the Z-axis moving guide rail component 223. The sub-carrier is then transported to the position of the first conveyor belt 112 corresponding to the mother carrier, the sub-carrier is combined with the mother carrier to form a complete PCB carrier, and the combined PCB carrier is directly unloaded from the first conveyor belt 112; if the detection result is NG, the loading and unloading claw mechanism 21 will still clamp the sub-carrier from the second conveyor belt 312 and transport the sub-carrier to the position of the first conveyor belt 112 corresponding to the mother carrier, the sub-carrier and the mother carrier are combined to form a complete PCB carrier, and then the PCB carrier is clamped and moved to the carrier plate 61 for buffering, so as to realize the recovery of defective products.
[0039] In summary, the whole process has a high degree of automation and can simultaneously meet the two work processes of PCB carrier disassembly, greatly improving production efficiency, facilitating production planning and quality control, and increasing production benefits.
[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A PCB carrier automatic disassembly and assembly device, characterized by: include: A conveying assembly (1) comprises a first conveying track (11) and a positioning mechanism (12), wherein the first conveying track (11) is used to dock with an upstream device to transport a PCB carrier to be disassembled or a mother carrier to be assembled, or to dock with a downstream device to transport an assembled PCB carrier or a disassembled mother carrier, and the positioning mechanism (12) positions the PCB carrier or the mother carrier during the process of transporting the PCB carrier or the mother carrier on the first conveying track (11); The disassembly assembly (2) comprises a loading and unloading clamping claw mechanism (21) and a multi-axis transport mechanism (22) for driving the loading and unloading clamping claw mechanism (21) to move, wherein the loading and unloading clamping claw mechanism (21) is used to disassemble a sub-carrier in a PCB carrier from a mother carrier on the first conveying track (11), or to assemble the sub-carrier into the mother carrier to reassemble into a complete PCB carrier; The carrier input and output assembly (3) comprises a second conveying track (31) and a side push mechanism (32); the second conveying track (31) is used to convey sub-carriers that have been disassembled or are to be assembled; the loading and unloading gripper mechanism (21) moves the sub-carrier disassembled from the mother carrier to the second conveying track (31), or moves the sub-carrier to be assembled from the second conveying track (31) to the position of the first conveying track (11) for assembly with the mother carrier; and the side push mechanism (32) fixes the sub-carrier during the process of transporting the sub-carrier on the second conveying track (31).
2. The automatic PCB carrier disassembly and assembly device according to claim 1, characterized in that: The first conveying track (11) comprises two parallel first side plates (111), and first conveyor belts (112) are provided on opposite sides of the two first side plates (111), and two sides of the PCB carrier or two sides of the mother carrier are respectively abutted against the two first conveyor belts (112).
3. The automatic PCB carrier disassembly and assembly device according to claim 2, characterized in that: The positioning mechanism (12) comprises a plurality of first telescopic cylinders arranged horizontally, wherein the plurality of first telescopic cylinders are located on one of the first side plates (111). When positioning a PCB carrier or a mother carrier, the first telescopic cylinders extend an output shaft and push the PCB carrier or the mother carrier to move in the direction of another first side plate (111) until the PCB carrier or the mother carrier abuts against the other first side plate (111).
4. The automatic PCB carrier disassembly and assembly device according to claim 2, characterized in that: A lifting mechanism (13) is also provided between the two first side plates (111), and the lifting mechanism (13) comprises a bottom plate (131), and the bottom plate (131) is provided below the first conveyor belt (112). A plurality of lifting pins (132) that can be lifted and lowered in a vertical direction are provided on the bottom plate (131). When the PCB carrier is disassembled, the lifting pins (132) move upward to lift the sub-carrier from the mother carrier to a certain height, so that the sub-carrier is separated from the mother carrier.
5. The automatic PCB carrier disassembly and assembly device according to claim 1, characterized in that: The multi-axis transport mechanism (22) comprises an X-axis moving guide rail assembly (221), a Y-axis moving guide rail assembly (222) and a Z-axis moving guide rail assembly (223) which are mutually matched and connected.
6. The automatic PCB carrier disassembly and assembly device according to claim 1, characterized in that: The second conveying track (31) comprises two parallel second side plates (311), and second conveyor belts (312) are provided on opposite sides of the two second side plates (311), and two sides of the sub-carrier are respectively abutted against the two second conveyor belts (312).
7. The automatic PCB carrier disassembly and assembly device according to claim 6, characterized in that: The side-pushing mechanism (32) comprises a plurality of second telescopic cylinders arranged horizontally, wherein the plurality of second telescopic cylinders are located on one of the second side plates (311). When positioning the mother-child carrier, the second telescopic cylinders extend the output shaft and push the mother-child carrier to move in the direction of another second side plate (311) until the mother-child carrier abuts against the other second side plate (311).
8. The PCB carrier automatic disassembly and assembly device according to claim 1, characterized in that: The device also includes a detection component, which includes a carrier photographing component (4) and a camera photographing and code reading component (5). The carrier photographing component (4) is arranged above the first conveying track (11) and is used to photograph and detect the materials on the disassembled mother carrier. The camera photographing and code reading component (5) is arranged above the second conveying track (31) and is used to read the codes of the input and output sub-carriers.
9. The automatic PCB carrier disassembly and assembly device according to claim 8, characterized in that: It also includes an NG tray assembly (6), wherein the NG tray assembly (6) includes a movable carrier (61), and the carrier (61) is used to store NG defective PCB carriers. When the carrier camera assembly (4) detects that the material on the mother carrier after the child carrier is separated is NG material, the loading and unloading clamping claw mechanism (21) re-installs the separated child carrier onto the mother carrier, reassembles them into a complete PCB carrier and transports them to the carrier (61).