Automatic tail moving device

Abstract

The invention belongs to the technical field of belt conveyor auxiliary equipment, and provides an automatic moving machine tail device which comprises a frame, a connecting rod and a crawler belt, the frame comprises a base, a bearing wheel is rotationally connected to the base, a first rotating wheel is rotationally connected to the end of the base, a bearing seat is fixedly connected to the top of the base, and a shear type support is rotationally connected to the bearing seat; a cross bar is rotationally connected to the top of the shear type support, second rotating wheels are rotationally connected to the two ends of the connecting rod, and a double-shaft driving motor is fixedly connected to the connecting rod; through cooperation of the driving motor and the crawler belt, rapid and stable movement of the tail is achieved, through cooperative work of the lifting component and the translation component, up-and-down and left-and-right movement of the tail is achieved, the precise positioning requirements in different scenes are met, in the running process, the position of the tail can be adjusted in real time through an automatic control system, and the working efficiency is improved. Stable operation of the conveyor is ensured, manual intervention is reduced, operation precision is high, and operation errors are effectively avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of belt conveyor auxiliary equipment, and more specifically, it is an automatic tail moving device. Background Art

[0002] A belt conveyor is a continuous conveying device widely used in industrial production, logistics transportation, mine exploitation, port loading and unloading, etc. It realizes the transportation of materials through the continuous movement of the conveyor belt, and has the advantages of strong transportation capacity, stable operation, simple structure, and convenient maintenance.

[0003] However, during the use of traditional belt conveyors, the movement and adjustment of the tail part usually require manual operation. For example, the tail is moved by manually adjusting the bracket or using a simple mechanical device, which is inefficient and inaccurate. Moreover, operation errors are likely to occur during frequent position adjustments, resulting in instability or damage to the conveyor, lacking automatic control and being unable to achieve fast and accurate positioning.

[0004] Therefore, those skilled in the art have proposed an automatic tail moving device to solve the problems raised in the background art.

[0005] The above information disclosed in this background art is only used to increase the understanding of the background art of the present invention. Therefore, it may include prior art that is not known to ordinary skilled persons in the art. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides an automatic tail moving device to solve the problem that the movement and adjustment of the tail part in the prior art usually require manual operation.

[0007] To achieve the above object, the present invention provides an automatic tail moving device, including a vehicle frame, a connecting rod, and a crawler. The vehicle frame includes a base, on which a load-bearing wheel is rotatably connected. A first runner is rotatably connected to one end of the base. A receiving seat is fixedly connected to the top of the base, and a scissor support is rotatably connected to the receiving seat. A cross bar is rotatably connected to the top of the scissor support. Both ends of the connecting rod are rotatably connected with a second runner. A double-shaft drive motor is fixedly connected to the connecting rod. Embedding grooves are formed in the crawler, and the first runner and the second runner are both engaged in the embedding grooves. Lifting members are symmetrically arranged on both sides of the vehicle frame. A receiving platform is arranged on the top of the cross bar, and a plurality of holes are symmetrically formed in the receiving platform. Translation members are symmetrically arranged at the bottom of the receiving platform.

[0008] Preferably, a plurality of load-bearing wheels are provided and evenly distributed in the horizontal direction. Two vehicle frames and crawlers are provided and symmetrically arranged. The crawler is sleeved on the first runner and the second runner.

[0009] Preferably, the lifting component includes a propulsion cylinder arranged on the base, a slider is fixedly connected to the output end of the propulsion cylinder, a connecting seat is rotatably connected to the propulsion cylinder, and a third rotating wheel is rotatably connected to the connecting seat.

[0010] Preferably, the ends of the scissor-type bracket are rotatably connected to a slider, the slider is slidably connected to the base, and the third rotating wheel is engaged in the embedding groove.

[0011] Preferably, the translation member includes a sliding rod fixedly connected to the bottom of the receiving platform, the bottom of the receiving platform is fixedly connected to a first fixed plate and a second fixed plate, the inner side of the horizontal bar on one side is fixedly connected to a first horizontal cylinder, and the inner side of the horizontal bar on the other side is fixedly connected to a second horizontal cylinder.

[0012] Preferably, the sliding rod is slidably connected to the two horizontal bars, the output end of the first horizontal oil cylinder is fixedly connected to the first fixed plate, and the output end of the second horizontal oil cylinder is fixedly connected to the second fixed plate.

[0013] Preferably, a plurality of locking components are symmetrically arranged at the bottom of the receiving platform, and the locking components include a receiving plate fixedly connected to the bottom of the receiving platform, a swivel is rotatably connected to the receiving plate, and a notch is provided on the swivel.

[0014] Preferably, the locking assembly further comprises a guide frame rotatably connected in the slot, an extrusion rod is slidably connected in the guide frame, an end portion of the extrusion rod is rotatably connected to a rotating shaft, and a driving member is provided on the receiving plate.

[0015] Preferably, the driving component includes a telescopic rod fixedly connected to the side of the rotating ring, the telescopic rod is rotatably connected to the driving block, the supporting plate is symmetrically fixed with side plates, the side plates are rotatably connected to the threaded rods, and the supporting plate is fixedly connected to the motor.

[0016] Preferably, an opening is provided on the receiving plate, the hole and the opening are connected, the rotating shaft is fixedly connected to the receiving plate, the guide frame, the extrusion rod and the rotating shaft are provided in multiple numbers and are evenly distributed around the circumference, the driving block is threadedly connected to the threaded rod, and the end of the threaded rod is fixedly connected to the output end of the motor.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention realizes rapid and smooth movement of the tail through the cooperation of the drive motor and the crawler track, and realizes the up, down, left and right movement of the tail through the coordinated work of the lifting component and the translation component, so as to meet the precise positioning requirements in different scenarios. During operation, the tail position can be adjusted in real time through the automatic control system to ensure the stable operation of the transport aircraft, reduce manual intervention, have high operation accuracy, and effectively avoid operational errors.

[0019] 2. The present invention can be adjusted according to the different sizes of the bottom rods of the belt conveyor by setting a locking assembly. The threaded rod is driven to rotate by a motor, which drives the drive block to move, thereby rotating the swivel. Through the design of the extrusion rod and the guide frame, the swivel rotates and drives multiple extrusion rods to firmly clamp the rods at the bottom of the belt conveyor in the holes of the receiving platform. It can adapt to rods of different specifications, enhance the versatility and flexibility of the device, effectively prevent the belt conveyor from displacement or shaking during operation, and ensure its stability on the device.

[0020] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of an automatic tail moving device in an embodiment of the present invention;

[0022] Figure 2 A side view of an automatic tail moving device according to an embodiment of the present invention;

[0023] Figure 3 This is a top view of an automatic tail moving device according to an embodiment of the present invention;

[0024] Figure 4 This is a cross-sectional view of an automatic tail moving device according to an embodiment of the present invention;

[0025] Figure 5 This is a partial structural diagram of an automatic tail moving device according to an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the structure of a locking assembly of an automatically movable tail device in an embodiment of the present invention.

[0027] In the figure: 1, vehicle frame; 101, base; 102, load-bearing wheel; 103, first runner; 104, receiving seat; 105, scissor support; 106, cross bar; 2, connecting rod; 21, second runner; 3, dual-axis drive motor; 4, crawler; 41, embedding groove; 5, propulsion oil cylinder; 6, slider; 7, connecting seat; 8, third runner; 9, receiving platform; 91, hole; 10, slide bar; 11, first fixing plate; 12, first horizontal oil cylinder; 13, second fixing plate; 14, second horizontal oil cylinder; 15, locking assembly; 151, receiving plate; 152, swivel ring; 153, notch; 154, guiding frame; 155, extrusion rod; 156, rotating shaft; 157, driving member; 1571, telescopic rod; 1572, driving block; 1573, side plate; 1574, threaded rod; 1575, motor. Detailed implementation manners

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. It should be noted that the drawings are schematic and not drawn to scale. For the sake of clarity and convenience in the figure, the relative sizes and proportions of the parts shown in the figure are exaggerated or reduced in size for illustration, and any size is only exemplary and not limiting.

[0029] Embodiment 1:

[0030] Please refer to Figure 1 - Figure 6As shown in the figure, an automatic mobile tail device includes a vehicle frame 1, a connecting rod 2, and a crawler 4. The vehicle frame 1 includes a base 101. A load-bearing wheel 102 is rotatably connected to the base 101. A first runner 103 is rotatably connected to the end of the base 101. A receiving seat 104 is fixedly connected to the top of the base 101. A scissor support 105 is rotatably connected to the receiving seat 104. A cross bar 106 is rotatably connected to the top of the scissor support 105. Second runners 21 are rotatably connected to both ends of the connecting rod 2. A dual-axis drive motor 3 is fixedly connected to the connecting rod 2. Embedding grooves 41 are formed in the crawler 4. The first runner 103 and the second runners 21 are both engaged in the embedding grooves 41. Lifting members are symmetrically arranged on both sides of the vehicle frame 1. A receiving platform 9 is arranged on the top of the cross bar 106. A plurality of holes 91 are symmetrically formed in the receiving platform 9. Translation members are symmetrically arranged at the bottom of the receiving platform 9. The base 101 serves as the basic support structure of the entire device, bearing the weights of other components and contacting the ground through the load-bearing wheels 102 to achieve the moving function of the device. The load-bearing wheels 102 are used to support the weight of the entire device. Their design with multiple and evenly distributed horizontally helps to improve the stability and load-bearing capacity of the device. The first runner 103 cooperates with the crawler 4. By engaging the embedding grooves 41, it provides power and guidance for the movement of the crawler 4 and is one of the key components for realizing the movement of the tail. The receiving seat 104 is used to support the scissor support 105, ensuring the stability and reliability of the lifting mechanism. The end of the scissor support 105 is connected to a slider 6. Through the telescopic movement of the propulsion oil cylinder 5, the scissor support 105 is opened and clamped, thereby driving the cross bar 106 to move up and down to achieve the lifting function of the tail. The connecting rod 2 transmits the power of the dual-axis drive motor 3 to the crawler 4 through the engagement of the second runners 21 with the crawler 4 to realize the movement of the crawler 4. The second runners 21 provide power and guidance for the movement of the crawler 4 by engaging the embedding grooves 41 in the crawler 4 to ensure the smooth operation of the crawler 4. The dual-axis drive motor 3 provides power for the movement of the crawler 4. By controlling the rotation speed and direction of the motor, the fast and smooth movement of the tail can be achieved. The crawler 4 is used to engage with the first runner 103 and the second runners 21. Through the movement of the crawler 4, the movement of the tail is realized. The design of the crawler 4 makes the movement of the tail more stable and reliable and can adapt to different ground conditions.

[0031] Specifically, a plurality of load-bearing wheels 102 are provided and evenly distributed horizontally. Two vehicle frames 1 and two crawlers 4 are provided and symmetrically arranged. The crawler 4 is sleeved on the first runner 103 and the second runners 21.

[0032] Further, the lifting member includes a propulsion oil cylinder 5 disposed on the base 101. A slider 6 is fixedly connected to the output end of the propulsion oil cylinder 5. A connecting seat 7 is rotatably connected to the propulsion oil cylinder 5. A third runner 8 is rotatably connected to the connecting seat 7. Through the control of the hydraulic system, the telescopic movement of the propulsion oil cylinder 5 pushes the slider 6 to slide on the base 101, thereby driving the scissor bracket 105 to perform opening and clamping movements, realizing the lifting function of the machine tail. The slider 6 is used to connect the propulsion oil cylinder 5 and the scissor bracket 105, converting the telescopic movement of the propulsion oil cylinder 5 into the opening and clamping movements of the scissor bracket 105. The connecting seat 7 is used to connect the propulsion oil cylinder 5 and the third runner 8, ensuring that the third runner 8 can engage with the embedding groove 41 of the crawler 4, providing guidance for the movement of the crawler 4. The third runner 8 cooperates with the crawler 4 to provide guidance for the movement of the crawler 4, ensuring the smooth operation of the crawler 4.

[0033] Further, the ends of the scissor bracket 105 are rotatably connected to the slider 6. The slider 6 is slidably connected to the base 101. The third runner 8 is engaged in the embedding groove 41.

[0034] As can be seen from the above, when it is necessary to move the machine tail of the belt conveyor, the belt conveyor is installed on multiple devices. The double-shaft drive motor 3 is started. Through the cooperation of the first runner 103 and the second runner 21 with the crawler 4, the displacement of the machine tail of the belt conveyor is realized. The device can be used alone as a transport vehicle. When it is necessary to adjust the height of the machine tail of the belt conveyor, the propulsion oil cylinder 5 expands and contracts under the action of the hydraulic system, pushing the scissor bracket 105 to perform opening and clamping movements, thereby driving the two cross bars 106 to move up and down. During the movement of the propulsion oil cylinder 5, the up and down movement of the frame 1 drives the receiving platform 9 to realize lifting, thereby adjusting the height of the machine tail of the belt conveyor. Two jacking oil cylinders can also be symmetrically and vertically arranged on the base 101. The output ends of the two jacking oil cylinders are fixedly connected to the cross bar 106, thereby realizing the lifting movement.

[0035] Embodiment 2:

[0036] Please refer to Figure 5As shown in the figure, this embodiment is basically the same as the previous one, except that the translation member includes a slide bar 10 fixedly connected to the bottom of the receiving platform 9. The bottom of the receiving platform 9 is fixedly connected with a first fixing plate 11 and a second fixing plate 13. The inner side of one side cross bar 106 is fixedly connected with a first horizontal oil cylinder 12, and the inner side of the other side cross bar 106 is fixedly connected with a second horizontal oil cylinder 14. The slide bar 10 is used for sliding connection with the two cross bars 106 to realize the translation of the receiving platform 9. The first fixing plate 11 is fixed to the bottom of the receiving platform 9 and is connected to the first horizontal oil cylinder 12 for transmitting the translation force. The first horizontal oil cylinder 12 is used to provide the translation force to push the receiving platform 9 to move on the cross bar 106 through the slide bar 10. The second fixing plate 13 is fixedly connected to the bottom of the receiving platform 9 and is connected to the second horizontal oil cylinder 14 for transmitting the translation force. The second horizontal oil cylinder 14 is similar to the first horizontal oil cylinder 12, providing the translation force to push the receiving platform 9 to move on the cross bar 106.

[0037] Specifically, the slide bar 10 is slidably connected to the two cross bars 106. The output end of the first horizontal oil cylinder 12 is fixedly connected to the first fixing plate 11, and the output end of the second horizontal oil cylinder 14 is fixedly connected to the second fixing plate 13.

[0038] As can be seen from the above, when it is necessary to adjust the horizontal movement of the tail of the belt conveyor, the two horizontal oil cylinders expand and contract under the action of the hydraulic system, alternately pushing the first fixing plate 11 and the second fixing plate 13, so that the receiving platform 9 moves left and right on the cross bar 106. The movement of the fixing plate drives the receiving platform 9 to move horizontally along the horizontal direction through the slide bar 10, thereby adjusting the position of the belt conveyor.

[0039] Through the cooperation of the driving motor and the crawler 4, the rapid and stable movement of the tail is realized. Through the coordinated work of the lifting member and the translation member, the up, down, left and right movement of the tail is realized, meeting the precise positioning requirements in different scenarios. During the operation, the position of the tail can be adjusted in real time through the automatic control system to ensure the stable operation of the conveyor, reduce manual intervention, have high operation accuracy, and effectively avoid operation errors.

[0040] Embodiment Three:

[0041] Please refer to Figure 6As shown in the figure, this embodiment is basically the same as the previous one. The difference is that a plurality of locking components 15 are symmetrically arranged at the bottom of the receiving platform 9. The locking component 15 includes a receiving plate 151 fixedly connected to the bottom of the receiving platform 9. A rotating ring 152 is rotatably connected to the receiving plate 151. A notch 153 is formed in the rotating ring 152. The locking component 15 is used to fix the insertion rod at the bottom of the belt conveyor to ensure its stability on the receiving platform 9. The receiving plate 151 serves as the installation base of the locking component 15. The rotating ring 152 is used to drive the guiding frame 154 and the pressing rod 155 to perform centering and clamping movements. The notch 153 is used to install the guiding frame 154.

[0042] Specifically, the locking component 15 further includes a guiding frame 154 rotatably connected in the notch 153. A pressing rod 155 is slidably connected in the guiding frame 154. A rotating shaft 156 is rotatably connected to the end of the pressing rod 155. A driving member 157 is arranged on the receiving plate 151. The guiding frame 154 is used to guide the movement of the pressing rod 155. The pressing rod 155 slides in the guiding frame 154 to clamp the insertion rod. The rotating shaft 156 is connected to the end of the pressing rod 155 to transmit power. The driving member 157 is used to drive the pressing rod 155 to move to achieve the locking function.

[0043] Furthermore, the driving member 157 includes a telescopic rod 1571 fixedly connected to the side of the rotating ring 152. A driving block 1572 is rotatably connected to the telescopic rod 1571. Side plates 1573 are symmetrically and fixedly connected to the receiving plate 151. A threaded rod 1574 is rotatably connected to the side plates 1573. A motor 1575 is fixedly connected to the receiving plate 151. The telescopic rod 1571 is used to adjust the position of the driving block 1572. The driving block 1572 is used to push the pressing rod 155. The side plates 1573 are symmetrically and fixedly connected to the receiving plate 151 to install the threaded rod 1574. The threaded rod 1574 is used to drive the driving block 1572 to move. The motor 1575 is used to provide power to drive the threaded rod 1574 to rotate.

[0044] Furthermore, an opening is formed in the receiving plate 151. The hole 91 communicates with the opening. The rotating shaft 156 is fixedly connected to the receiving plate 151. A plurality of guiding frames 154, pressing rods 155 and rotating shafts 156 are provided and are evenly distributed in a circumferential manner. The driving block 1572 is threadedly connected to the threaded rod 1574. A fixed connection is provided between the end of the threaded rod 1574 and the output end of the motor 1575.

[0045] As can be seen from the above, when the motor 1575 rotates, since the output end of the motor 1575 is fixedly connected to the threaded rod 1574, starting the motor 1575 drives the threaded rod 1574 to rotate. Since the driving block 1572 is threadedly connected to the threaded rod 1574, the rotation of the threaded rod 1574 causes the driving block 1572 to move along the threaded rod 1574. The driving block 1572 drives the rotating ring 152 to rotate on the receiving plate 151 through the telescopic rod 1571. Driven by the rotating ring 152, a plurality of pressing rods 155 are pushed to slide in a plurality of guiding frames 154 to perform centering and clamping movements, thereby pressing the inserting rods. Through the clamping action of the pressing rods 155, the inserting rods at the bottom of the belt conveyor are fixed in the holes 91 to ensure its stability. By providing the locking assembly 15, it can be adjusted according to the inserting rods at the bottom of belt conveyors of different sizes, and can adapt to inserting rods of different specifications, enhancing the versatility and flexibility of the device, effectively preventing the belt conveyor from shifting or shaking during operation, and ensuring its stability on the device.

[0046] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the descriptions in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art. Coupled with the circuit connection adopting the conventional connection method in the prior art, details are not described herein again. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0047] In the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. Other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0048] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic tail device for a moving machine, characterized in that: It includes a frame (1), a connecting rod (2) and a crawler belt (4). The frame (1) includes a base (101). A load-bearing wheel (102) is rotatably connected to the base (101). A first runner (103) is rotatably connected to the end of the base (101). A receiving seat (104) is fixedly connected to the top of the base (101). A scissor support (105) is rotatably connected to the receiving seat (104). A cross bar (106) is rotatably connected to the top of the scissor support (105). Both ends of the connecting rod (2) are rotatably connected to a second runner (21). A dual-axis drive motor (3) is fixedly connected to the connecting rod (2). An embedding groove (41) is formed in the crawler belt (4). The first runner (103) and the second runner (21) are both engaged in the embedding groove (41). Lifting members are symmetrically arranged on both sides of the frame (1). A receiving platform (9) is arranged on the top of the cross bar (106). A plurality of holes (91) are symmetrically formed in the receiving platform (9). Translation members are symmetrically arranged at the bottom of the receiving platform (9).

2. The automatic tail device according to claim 1, characterized in that: A plurality of the load-bearing wheels (102) are provided and evenly distributed in the horizontal direction. Both the frame (1) and the crawler belt (4) are provided with two and are symmetrically arranged. The crawler belt (4) is sleeved on the first runner (103) and the second runner (21).

3. The automatic tail device according to claim 1, characterized in that: The lifting member includes a propulsion oil cylinder (5) arranged on the base (101). A slider (6) is fixedly connected to the output end of the propulsion oil cylinder (5). A connecting seat (7) is rotatably connected to the propulsion oil cylinder (5). A third runner (8) is rotatably connected to the connecting seat (7).

4. The automatic tail device according to claim 3, characterized in that: The ends of the scissor support (105) are rotatably connected to the slider (6). The slider (6) is slidably connected to the base (101). The third runner (8) is engaged in the embedding groove (41).

5. An automatic tail device for a mobile machine according to claim 1, characterized in that: The translation member includes a slide bar (10) fixedly connected to the bottom of the receiving platform (9). A first fixing plate (11) and a second fixing plate (13) are fixedly connected to the bottom of the receiving platform (9). A first horizontal oil cylinder (12) is fixedly connected to the inner side of one cross bar (106). A second horizontal oil cylinder (14) is fixedly connected to the inner side of the other cross bar (106).

6. The automatic tail device according to claim 5, characterized in that: The slide bar (10) is slidably connected to the two cross bars (106). The output end of the first horizontal oil cylinder (12) is fixedly connected to the first fixing plate (11). The output end of the second horizontal oil cylinder (14) is fixedly connected to the second fixing plate (13).

7. An automatic tail device of a mobile machine according to claim 1, characterized in that: A plurality of locking components (15) are symmetrically arranged at the bottom of the receiving platform (9). The locking component (15) includes a receiving plate (151) fixedly connected to the bottom of the receiving platform (9). A rotating ring (152) is rotatably connected to the receiving plate (151). A notch (153) is formed in the rotating ring (152).

8. The automatic tail device according to claim 7, characterized in that: The locking component (15) further includes a guiding frame (154) rotatably connected to the notch (153). A pressing rod (155) is slidably connected inside the guiding frame (154). A rotating shaft (156) is rotatably connected to the end of the pressing rod (155). A driving member (157) is provided on the bearing plate (151).

9. An automatic tail device for a mobile machine according to claim 8, characterized in that: The driving member (157) includes a telescopic rod (1571) fixedly connected to the side of the rotating ring (152). A driving block (1572) is rotatably connected to the telescopic rod (1571). Side plates (1573) are symmetrically and fixedly connected to the bearing plate (151). A threaded rod (1574) is rotatably connected to the side plates (1573). A motor (1575) is fixedly connected to the bearing plate (151).

10. The automatic tail device according to claim 9, characterized in that: An opening is formed in the bearing plate (151). The hole (91) communicates with the opening. The rotating shaft (156) is fixedly connected to the bearing plate (151). A plurality of guiding frames (154), pressing rods (155) and rotating shafts (156) are provided and are evenly distributed in a circumferential manner. The driving block (1572) is threadedly connected to the threaded rod (1574). A fixed connection is provided between the end of the threaded rod (1574) and the output end of the motor (1575).

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