Track-changeable device of conveying line

Abstract

The utility model discloses a device capable of changing tracks of a conveying line, and relates to the technical field of conveying equipment. A lifting structure is arranged in the middle of the upper end of the bottom plate and used for pushing the device to conduct track conversion, second track structures are symmetrically arranged on the upper portion of the lifting structure and used for connecting material conveying between the first conveying line and the second conveying line, and a first track structure is arranged on the upper portions of the second track structures. The first track structure is used for connecting material conveying between the two first conveying lines. The second track structure and the first track structure are pushed to ascend and descend through the lifting structure, so that the material conveying track of the conveying line is changed, the flexibility of the conveying line in the material conveying process is improved, in addition, after the conveying track is changed, it is not needed to wait for the track transfer structure to move back and forth, and the conveying efficiency is improved. Therefore, the continuity of the conveying line in the material conveying process is guaranteed, and the conveying efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission equipment, in particular to a device for changing tracks of a conveyor line. Background Art

[0002] With the rapid development of science and technology and the continuous improvement of industrial automation, continuous conveyor lines have played an increasingly important role in various factories. These conveyor lines are responsible for the transmission of materials, parts, semi-finished products, etc. on the production line to ensure the continuity and efficiency of production. However, the existing conveyor line track adjustment methods are often too complicated and lack flexibility, which to some extent limits the improvement of production efficiency.

[0003] For many factories, the track adjustment of conveyor lines is usually time-consuming and laborious. Sometimes, in order to adapt to production needs or solve problems such as track misalignment and material blockage, operators may need to go through a series of complex steps to adjust the track. This not only increases the adjustment time, but may also affect the stable operation of the entire production line; in addition, the track adjustment of some conveyor lines is not flexible enough to cope with a variety of different production environments and needs, which to a certain extent restricts the improvement of production efficiency.

[0004] Chinese patent document CN219566702U discloses a conveyor track changing device, including a bottom bracket, two slide rails are arranged in parallel and at intervals on the bottom bracket, the slide rails are perpendicular to the conveying direction of the conveyor line, a sliding base is slidably arranged on the slide rails, two side plates are arranged on the sliding base, the two side plates are parallel and arranged at intervals, a driving wheel and a driven wheel are respectively arranged at both ends of the outer plate surface of the side plate, the driving wheel and the driven wheel are connected by a belt, the two driving wheels are connected by a driving shaft, a driving mechanism for driving the driving shaft to rotate is arranged on the sliding base, a cylinder is fixedly arranged on the bottom bracket, and the end of the telescopic rod of the cylinder is fixedly connected to the sliding base; but there are still the following defects in the implementation process:

[0005] Although the above patent document realizes the track switching of materials between two parallel tracks, the device in the above document, during the process of conveying materials, due to the continuous movement of the track switching structure to transport materials, the entire conveyor line needs to be frequently paused during operation to wait for the movement and connection of the track switching structure, thereby affecting the conveying efficiency of the entire conveyor line. Utility Model Content

[0006] The purpose of the utility model is to provide a device for changing the track of a conveyor line to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A device for changing the track of a conveyor line comprises a base plate; a first conveyor line is symmetrically fixedly connected to one side of the upper end of the base plate, a second conveyor line is symmetrically fixedly connected to the side of the upper end of the base plate away from the first conveyor line, a slow-feeding structure is symmetrically fixedly connected to the middle of the upper end of the base plate, the slow-feeding structure is used to transfer materials conveyed by the first conveyor line to other tracks for transmission, a lifting structure is arranged in the middle of the upper end of the base plate, the lifting structure is used to push the device to change the track, a second track structure is symmetrically arranged on the upper part of the lifting structure, the second track structure is used to connect the material transportation between the first conveyor line and the second conveyor line, and a first track structure is arranged on the upper part of the second track structure, the first track structure is used to connect the material transportation between the two first conveyor lines.

[0009] A further improvement of the technical solution of the utility model is that the slow-feeding structure includes a support frame 1, a lower end of the support frame is fixedly connected to the upper end of the bottom plate, a side baffle 1 is fixedly connected to one side of the upper end of the support frame 1, a side of the upper end of the support frame 1 away from the side baffle 1 is fixedly connected to a side baffle 2, a first conveyor belt is commonly provided on the opposite surfaces of the side baffle 1 and the side baffle 2, a motor 1 is fixedly connected to the side of the side baffle 1 away from the first conveyor belt, and an output end of the motor 1 is fixedly connected to one of the transmission shafts of the first conveyor belt, and a side of the side baffle 2 close to the first conveyor line and a side of the side baffle 1 close to the first conveyor line are commonly fixedly connected to a connecting platform 1.

[0010] The above-mentioned technical solution is adopted, in which the transmission shaft of the first conveyor belt is driven to rotate by an output end of the motor, thereby driving the first conveyor belt to run, and then the material transmitted to the end face of the first conveyor belt is transported to the next conveying device, so that the slow-feeding structure can be applied to different conveying track structures, thereby improving the efficiency of the device in conveying materials.

[0011] A further improvement of the technical solution of the utility model is that the horizontal height of the upper end surface of the connecting platform is flush with the horizontal height of the end surface of the conveyor belt of the first conveyor line.

[0012] The above technical solution is adopted. In this solution, the upper end surface of connecting platform one is made higher than the horizontal height of the conveyor belt end surface of the first conveyor line to be flush, thereby preventing the first conveyor line from conveying materials to connecting platform one. The material is prevented from being blocked at the feed point of connecting platform one, thereby affecting the material conveying efficiency. The connecting platform one is used as a material conveying bridge, so that the material can be conveyed more smoothly from the first conveyor line to the first conveyor belt, reducing the bumps of the material during the conveying process, thereby reducing the damage to the material during the conveying process.

[0013] A further improvement of the technical solution of the utility model is that the first track structure includes two support frames 2, the upper ends of the two support frames 2 are commonly fixedly connected with an annular groove plate, the opposite surfaces of the two support frames 2 are commonly fixedly connected with a support plate 2, and the upper end of the support plate 2 is provided with a propulsion structure, which is used to push the material transported to the inner cavity of the annular groove plate to move.

[0014] The above technical solution is adopted, in which the material transported to the inner cavity of the annular groove plate is pushed to move by the operation of the propulsion structure, thereby preventing the material from being blocked in the inner cavity of the annular groove plate during the transportation process, thereby affecting the transportation efficiency of the entire conveying line.

[0015] A further improvement of the technical solution of the utility model is that the propulsion structure includes motor three, motor three is fixedly connected to support plate two, a turntable is fixedly connected to the output end of motor three, a plurality of push blocks are fixedly connected to the outer surface of the turntable in a circular array, a support block is rotatably connected to the lower part of the turntable, and the lower end of the support block is fixedly connected to the upper end of support plate two.

[0016] The above-mentioned technical solution is adopted, in which the turntable is driven to rotate by the three output ends of the motor, thereby driving a number of push blocks to rotate, and then the materials transported to the inner cavity of the annular groove plate are pushed by the push blocks to move; at the same time, during the rotation of the turntable, the turntable is supported by the support blocks to prevent the turntable from leaving the track during the rotation.

[0017] A further improvement of the technical solution of the utility model is that the lifting structure includes a support plate, four corners of a lower end of the support plate are fixedly connected with telescopic rods, the lower ends of several telescopic rods are fixedly connected to the upper end of the base plate, a hydraulic cylinder is fixedly connected to the middle of a lower end of the support plate, and the lower end of the hydraulic cylinder is fixedly connected to the upper end of the base plate.

[0018] The above-mentioned technical solution is adopted, in which the output end of the hydraulic cylinder piston rod pushes the support plate to move up and down, thereby driving the second track structure and the first track structure to change their positions, thereby changing the track of the conveyor line, and then adjusting the material transportation; at the same time, in the process of the output end of the hydraulic cylinder piston rod pushing the support plate to move up and down, the rod heads of several telescopic rods will also move up and down accordingly, thereby supporting the support plate.

[0019] A further improvement of the technical solution of the utility model is that the second track structure includes two side baffles three, the lower ends of the two side baffles three are fixedly connected to the upper end of the support plate one, the upper ends of the two side baffles three are fixedly connected to the lower end of the support frame two on the same side, the opposite surfaces of the two side baffles three are jointly provided with a second conveyor belt, the opposite surfaces of the two side baffles three are symmetrically fixedly connected to a connecting platform two, one side of the side baffles three away from the second conveyor belt is fixedly connected to a motor two, and the output end of the motor two is fixedly connected to one of the transmission shafts of the second conveyor belt.

[0020] The above-mentioned technical solution is adopted, in which one of the transmission shafts of the second conveyor belt is driven to rotate through the second output end of the motor, and then the second conveyor belt is driven to run, so that the material delivered to the second conveyor belt is transported to the second conveyor line, and then the entire conveyor line is ensured to operate normally after changing the track, thereby ensuring the continuity of the conveyed materials.

[0021] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0022] 1. The utility model provides a device for changing the track of a conveyor line, which promotes the lifting of the second track structure and the first track structure through the lifting structure, thereby changing the track of the conveyor line for conveying materials, thereby improving the flexibility of the conveyor line in the process of conveying materials. In addition, after changing the conveying track, there is no need to wait for the track changing structure to move back and forth, thereby ensuring the continuity of the conveyor line in the process of conveying materials and improving the conveying efficiency.

[0023] 2. The utility model provides a device for changing the track of a conveyor line, which drives the turntable to rotate through the three output ends of the motor, thereby driving a number of push blocks to rotate and move, and then utilizes the several push blocks to push the materials conveyed to the inner cavity of the annular groove plate to move, thereby preventing the materials from being blocked at the annular groove plate during the material conveying process, thereby improving the working efficiency of the conveyor line. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the first track of the overall structure of the utility model;

[0026] Figure 2 It is a schematic diagram of the second track of the overall structure of the utility model;

[0027] Figure 3 This is a schematic diagram of the slow-feeding structure of the utility model;

[0028] Figure 4 This is a schematic diagram of the first track structure of the utility model;

[0029] Figure 5 It is a partial schematic diagram of the first track structure of the utility model;

[0030] Figure 6 It is a schematic diagram of the propulsion structure of the utility model;

[0031] Figure 7 This is a schematic diagram of the lifting structure of the utility model;

[0032] Figure 8 This is a schematic diagram of the second track structure of the utility model;

[0033] In the figure: 1, bottom plate; 2, first conveyor line; 3, slow-feeding structure; 31, support frame 1; 32, side baffle 1; 33, motor 1; 34, first conveyor belt; 35, side baffle 2; 36, connecting platform 1; 4, lifting structure; 41, support plate 1; 42, telescopic rod; 43, hydraulic cylinder; 5, second track structure; 51, side baffle 3; 52, motor 2; 53, connecting platform 2; 54, second conveyor belt; 6, first track structure; 61, support frame 2; 62, support plate 2; 63, annular groove plate; 64, propulsion structure; 641, motor 3; 642, turntable; 643, push block; 644, support block; 7, second conveyor line. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the embodiments:

[0035] like Figure 1-8 As shown, the utility model provides a device for a conveyor line with a changeable track, comprising a base plate 1; a first conveyor line 2 is symmetrically fixedly connected to one side of the upper end of the base plate 1, a second conveyor line 7 is symmetrically fixedly connected to the side of the upper end of the base plate 1 away from the first conveyor line 2, a slow-feeding structure 3 is symmetrically fixedly connected to the middle of the upper end of the base plate 1, the slow-feeding structure 3 is used to transfer the material conveyed by the first conveyor line 2 to other tracks for transmission, a lifting structure 4 is arranged in the middle of the upper end of the base plate 1, the lifting structure 4 is used to push the device to change the track, a second track structure 5 is symmetrically arranged on the upper part of the lifting structure 4, the second track structure 5 is used to connect the material transportation between the first conveyor line 2 and the second conveyor line 7, and a first track structure 6 is arranged on the upper part of the second track structure 5, the first track structure 6 is used to connect the material transportation between the two first conveyor lines 2.

[0036] In this embodiment, the entire device is supported by the base plate 1, and the material transported by the first conveyor line 2 is transported to the second track structure 5 or the first track structure 6 by the slow-feeding structure 3, and then the second track structure 5 or the first track structure 6 transports the material to other places, and the second track structure 5 and the first track structure 6 are pushed to rise and fall by the lifting structure 4, so as to change the position of the second track structure 5 and the first track structure 6, so that the device can complete the track change demand of the conveyor line according to the demand, and the material transported by the first conveyor line 2 is transported to the next process through the cooperation of the second conveyor line 7 and the second track structure 5.

[0037] like Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, on the basis of Example 1, the utility model provides a technical solution: preferably, the slow-feeding structure 3 includes a support frame 31, the lower end of the support frame 31 is fixedly connected to the upper end of the bottom plate 1, one side of the upper end of the support frame 31 is fixedly connected to a side baffle 32, the side of the upper end of the support frame 31 away from the side baffle 32 is fixedly connected to a side baffle 2 35, the side of the side baffle 1 32 and the side baffle 2 35 opposite to each other are jointly provided with a first conveyor belt 34, the side of the side baffle 1 32 away from the first conveyor belt 34 is fixedly connected to a motor 1 33, and the output end of the motor 1 33 is fixedly connected to one of the transmission shafts of the first conveyor belt 34, the side of the side baffle 2 35 close to the first conveyor line 2 and the side of the side baffle 1 32 close to the first conveyor line 2 are jointly fixedly connected to a connecting platform 1 36, and the horizontal height of the upper end surface of the connecting platform 1 36 is flush with the horizontal height of the conveyor belt end surface of the first conveyor line 2;

[0038] The first track structure 6 includes two support frames 61, the upper ends of the two support frames 61 are commonly fixedly connected with an annular groove plate 63, the opposite surfaces of the two support frames 61 are commonly fixedly connected with a support plate 62, and the upper end of the support plate 62 is provided with a propulsion structure 64, the propulsion structure 64 is used to push the material transported to the inner cavity of the annular groove plate 63 to move, and the propulsion structure 64 includes a motor 641, the motor 641 is fixedly connected to the support plate 62, the output end of the motor 641 is fixedly connected with a turntable 642, the outer surface of the turntable 642 is fixedly connected with a plurality of push blocks 643 in an annular array, the lower part of the turntable 642 is rotatably connected with a support block 644, and the lower end of the support block 644 is fixedly connected to the upper end of the support plate 62.

[0039] In this embodiment, the staff transports the material to the end face of the connecting table 36 through the first conveyor line 2. When the motor 33 is in operation, the output end of the motor 33 drives the transmission shaft of the first conveyor belt 34 to rotate, thereby driving the first conveyor belt 34 to operate, and then the material transmitted to the end face of the connecting table 36 is transported to the feeding position of the inner cavity of the annular groove plate 63. At the same time, under the operation of the output end of the motor 3 641, the turntable 642 will be driven to rotate, and then the turntable 642 will rotate around the support block 644, and then the turntable 642 will drive a number of push blocks 643 to rotate and operate, and the materials transported to the inner cavity of the annular groove plate 63 are pushed by the push blocks 643 to move in the inner cavity of the annular groove plate 63, thereby transporting the materials to the end face of the first conveyor belt 34 on the other side, and then the output end of the motor 33 on the other side drives the transmission shaft of the first conveyor belt 34 to rotate, thereby driving the first conveyor belt 34 to operate, and then the materials are transported to the first conveyor line 2 on the other side, and the first conveyor line 2 on the other side transports the materials to the next process.

[0040] like Figure 7As shown, on the basis of Example 2, the utility model provides a technical solution: preferably, the lifting structure 4 includes a support plate 41, and the four corners of the lower end of the support plate 41 are fixedly connected with telescopic rods 42, and the lower ends of several telescopic rods 42 are commonly fixedly connected to the upper end of the base plate 1, and the middle part of the lower end of the support plate 41 is fixedly connected with a hydraulic cylinder 43, and the lower end of the hydraulic cylinder 43 is fixedly connected to the upper end of the base plate 1.

[0041] In this embodiment, when the track needs to be changed, first, the entire device is stopped, and then the output end of the piston rod of the hydraulic cylinder 43 pushes the support plate 41 to move upward, so that under the action of the support plate 41, the rod heads of several telescopic rods 42 will move upward together; at the same time, driven by the support plate 41, the second track structure 5 and the first track structure 6 will be pushed upward, thereby pushing the second track structure 5 to move to the position of the previous first track structure 6, replacing the first track structure 6 to transport materials.

[0042] like Figure 2 and Figure 8 As shown, on the basis of Example 3, the utility model provides a technical solution: preferably, the second track structure 5 includes two side baffle plates 3 51, the lower ends of the two side baffle plates 3 51 are commonly fixedly connected to the upper end of the support plate 1 41, the upper ends of the two side baffle plates 3 51 are commonly fixedly connected to the lower end of the support frame 2 61 on the same side, the opposite surfaces of the two side baffle plates 3 51 are commonly provided with a second conveyor belt 54, the opposite surfaces of the two side baffle plates 3 51 are commonly and symmetrically fixedly connected with a connecting platform 2 53, one side of the side baffle plates 3 51 away from the second conveyor belt 54 is fixedly connected to a motor 2 52, and the output end of the motor 2 52 is fixedly connected to one of the transmission shafts of the second conveyor belt 54.

[0043] In this embodiment, when it is necessary to transport materials on the second track structure 5, the staff transports the materials to the end face of the second connecting table 53 through the first conveyor line 2. When the second motor 52 is in operation, the output end of the second motor 52 drives the transmission shaft of the second conveyor belt 54 to rotate, thereby driving the second conveyor belt 54 to operate, and then transports the materials transmitted to the end face of the second connecting table 53 to the feed point of the second conveyor line 7, and then the second conveyor line 7 transports the materials to the next process.

[0044] The working principle of the device for changing the track of the conveyor line will be described in detail below.

[0045] like Figure 1-8As shown, when the material needs to be transported on the first track structure 6, the staff first transports the material to the end face of the connecting table 36 through the first conveyor line 2. When the motor 33 is in operation, the output end of the motor 33 drives the transmission shaft of the first conveyor belt 34 to rotate, thereby driving the first conveyor belt 34 to operate, and then the material transmitted to the end face of the connecting table 36 is transported to the feeding part of the inner cavity of the annular groove plate 63. At the same time, under the operation of the output end of the motor 3 641, the turntable 642 will be driven to rotate, and then the turntable 642 will rotate around the support block 644 rotates, and then the turntable 642 drives the push blocks 643 to rotate, and the push blocks 643 push the materials transported to the inner cavity of the annular groove plate 63 to move in the inner cavity of the annular groove plate 63, so as to transport the materials to the end surface of the first conveyor belt 34 on the other side, and then the output end of the motor 33 on the other side drives the transmission shaft of the first conveyor belt 34 to rotate, so as to drive the first conveyor belt 34 to run, and then transport the materials to the first conveyor line 2 on the other side, and the first conveyor line 2 on the other side transports the materials to the next process;

[0046] When the track needs to be changed, first, the entire device is stopped, and then the output end of the piston rod of the hydraulic cylinder 43 pushes the support plate 41 upward, so that under the action of the support plate 41, the rod heads of the plurality of telescopic rods 42 are driven to move upward together; at the same time, driven by the support plate 41, the second track structure 5 and the first track structure 6 are pushed upward, so that the second track structure 5 is pushed to move to the position of the first track structure 6 before, replacing the first track structure 6 to transport the material;

[0047] When the material needs to be transported on the second track structure 5, the staff transports the material to the end face of the second connecting platform 53 through the first conveyor line 2. When the second motor 52 is in operation, the output end of the second motor 52 drives the transmission shaft of the second conveyor belt 54 to rotate, thereby driving the second conveyor belt 54 to operate, and then transports the material transmitted to the end face of the second connecting platform 53 to the feed point of the second conveyor line 7, and then the second conveyor line 7 transports the material to the next process.

[0048] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A device for changing the track of a conveyor line, comprising a bottom plate (1); characterized in that: A first conveying line (2) is symmetrically fixedly connected to one side of the upper end of the base plate (1), a second conveying line (7) is symmetrically fixedly connected to the side of the upper end of the base plate (1) away from the first conveying line (2), a slow-feeding structure (3) is symmetrically fixedly connected to the middle of the upper end of the base plate (1), the slow-feeding structure (3) is used to transfer materials conveyed by the first conveying line (2) to other tracks for transmission, a lifting structure (4) is arranged in the middle of the upper end of the base plate (1), the lifting structure (4) is used to push the device to change the track, a second track structure (5) is symmetrically arranged on the upper part of the lifting structure (4), the second track structure (5) is used to connect the material transportation between the first conveying line (2) and the second conveying line (7), and a first track structure (6) is arranged on the upper part of the second track structure (5), the first track structure (6) is used to connect the material transportation between the two first conveying lines (2).

2. A device for changing the track of a conveyor line according to claim 1, characterized in that: The slow-feeding structure (3) comprises a support frame 1 (31), the lower end of the support frame 1 (31) is fixedly connected to the upper end of the bottom plate (1), one side of the upper end of the support frame 1 (31) is fixedly connected to a side baffle 1 (32), the side of the upper end of the support frame 1 (31) away from the side baffle 1 (32) is fixedly connected to a side baffle 2 (35), the side of the side baffle 1 (32) and the side baffle 2 (35) facing each other are jointly provided with a first conveyor belt (34), the side of the side baffle 1 (32) away from the first conveyor belt (34) is fixedly connected to a motor 1 (33), and the output end of the motor 1 (33) is fixedly connected to one of the transmission shafts of the first conveyor belt (34), and the side of the side baffle 2 (35) close to the first conveyor line (2) and the side of the side baffle 1 (32) close to the first conveyor line (2) are jointly fixedly connected to a connecting platform 1 (36).

3. A device for changing the track of a conveyor line according to claim 2, characterized in that: The horizontal height of the upper end surface of the connecting platform 1 (36) is flush with the horizontal height of the end surface of the conveyor belt of the first conveyor line (2).

4. The device for changing the track of a conveyor line according to claim 1, characterized in that: The first track structure (6) comprises two support frames (61), the upper ends of the two support frames (61) are commonly fixedly connected with an annular groove plate (63), the opposite surfaces of the two support frames (61) are commonly fixedly connected with a support plate (62), and the upper end of the support plate (62) is provided with a propulsion structure (64), and the propulsion structure (64) is used to propel the material transported into the inner cavity of the annular groove plate (63) to move.

5. A device for changing the track of a conveyor line according to claim 4, characterized in that: The propulsion structure (64) comprises a third motor (641), wherein the third motor (641) is fixedly connected to the second support plate (62), the output end of the third motor (641) is fixedly connected to a turntable (642), a plurality of push blocks (643) are fixedly connected to the outer surface of the turntable (642) in a circular array, the lower part of the turntable (642) is rotatably connected to a support block (644), and the lower end of the support block (644) is fixedly connected to the upper end of the second support plate (62).

6. A device for changing the track of a conveyor line according to claim 1, characterized in that: The lifting structure (4) comprises a support plate 1 (41), the four corners of the lower end of the support plate 1 (41) are fixedly connected to telescopic rods (42), the lower ends of a plurality of the telescopic rods (42) are commonly fixedly connected to the upper end of the base plate (1), the middle part of the lower end of the support plate 1 (41) is fixedly connected to a hydraulic cylinder (43), and the lower end of the hydraulic cylinder (43) is fixedly connected to the upper end of the base plate (1).

7. A device for changing the track of a conveyor line according to claim 6, characterized in that: The second track structure (5) comprises two side baffle plates three (51), the lower ends of the two side baffle plates three (51) are fixedly connected to the upper end of the support plate one (41), the upper ends of the two side baffle plates three (51) are fixedly connected to the lower end of the support frame two (61) on the same side, the opposite surfaces of the two side baffle plates three (51) are jointly provided with a second conveyor belt (54), the opposite surfaces of the two side baffle plates three (51) are symmetrically fixedly connected to a connecting platform two (53), one side of the side baffle plates three (51) away from the second conveyor belt (54) is fixedly connected to a motor two (52), and the output end of the motor two (52) is fixedly connected to one of the transmission shafts of the second conveyor belt (54).

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