Sheet pretreatment device

Abstract

This invention relates to the field of thin plate processing, specifically a thin plate pretreatment device, comprising a track shot blasting machine and a conveyor mounted on the track shot blasting machine. Multiple support assemblies are fixed on the conveyor. Each support assembly includes a symmetrically arranged first mounting frame and a second mounting frame. A strip plate is fixed between the first and second mounting frames. A clamping assembly for holding the thin plate and a rotating assembly for rotating the thin plate after clamping are disposed between the first and second mounting frames. The thin plate pretreatment device of this invention, through the cooperation of the support assemblies, rotating assembly, driving assembly, and resetting assembly, drives two L-shaped frames and the clamping and limiting thin plate to rotate. Through the rotation of the thin plate, the track shot blasting machine can sequentially perform shot blasting treatment on different positions of the thin plate, facilitating efficient shot blasting of the thin plate by the track shot blasting machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sheet processing, in particular to a sheet pretreatment device. BACKGROUND

[0002] In the manufacturing industry, steel materials need to be pretreated before being sent to the next process for production, and the treatment parameters of different specifications of steel materials are not uniform during pretreatment. However, due to its unique characteristics, the pretreatment process of the sheet is more difficult, and the parameters of each station are high, in order to improve the quality of sheet pretreatment.

[0003] The track shot blasting machine is a commonly used auxiliary machine for sheet surface treatment. In the process of shot blasting the steel plate by the track shot blasting machine, the sheet can only be shot blasted on one side at a time with the conveying of the track, and needs to be conveyed again after turning over, which affects the efficiency of sheet surface treatment. In the process of shot blasting, the sheet surface is assisted by part of the oxide skin, which affects the effect of sheet surface treatment. SUMMARY

[0004] In view of the problems in the prior art, the present application provides a sheet pretreatment device.

[0005] The technical scheme adopted by the present application to solve its technical problems is: a sheet pretreatment device, comprising a track shot blasting machine and a conveyor arranged on the track shot blasting machine, a plurality of support assemblies are fixed on the conveyor, the support assemblies comprise symmetrically arranged first mounting brackets and second mounting brackets, a strip-shaped plate is fixed between the first mounting brackets and the second mounting brackets, a clamping assembly for clamping the sheet and a rotating assembly for rotating the sheet after clamping are arranged between the first mounting brackets and the second mounting brackets, and a blowing and cleaning assembly for blowing and cleaning the oxide skin after shot blasting of the sheet is arranged on the strip-shaped plate.

[0006] The rotating assembly comprises a first rotating shaft and a second rotating shaft rotatably connected to the first mounting bracket and the second mounting bracket respectively, two L-shaped brackets are arranged on the opposite sides of the first mounting bracket and the second mounting bracket, one end of the second rotating shaft is fixed to the L-shaped bracket, the first rotating shaft is connected to the L-shaped bracket through a connecting assembly, and a driving assembly for rotating the first rotating shaft is arranged in the track shot blasting machine.

[0007] The clamping assembly comprises a plurality of mounting blocks fixed to the L-shaped bracket, a T-shaped rod is slidably connected to each mounting block, and a first spring is sleeved on the side wall of the T-shaped rod.

[0008] The connecting assembly comprises a spline hole formed in one end of the first rotating shaft, a spline shaft is slidably connected to the spline hole, one end of the spline shaft is fixed to the L-shaped frame, a pushing assembly for pushing the second rotating shaft is arranged on the second mounting frame, and a resetting assembly for resetting the second rotating shaft after being pushed is arranged between the first rotating shaft and the spline shaft.

[0009] The pushing assembly comprises a mounting disc fixed to one end of the second rotating shaft, a protrusion is fixed to the side of the mounting disc close to the second mounting frame, and a plurality of pushing pins for pushing against the protrusion are fixed in an annular array on the second mounting frame.

[0010] The resetting assembly comprises a circular plate fixed to the first rotating shaft and the spline shaft, a second spring is connected between the two circular plates, and the second spring is sleeved on the outside of the first rotating shaft.

[0011] The driving assembly comprises a gear fixed to one end of the first rotating shaft, and a rack for meshing and driving with the gear is fixed in the track shot blasting machine through the connecting frame.

[0012] The air blowing and cleaning assembly comprises a plurality of air pipes mounted on the strip-shaped plate, a spray head is fixed to the upper end of each air pipe, a connecting pipe is arranged at the lower end of the strip-shaped plate, one end of each air pipe is connected to the connecting pipe in communication, and an inflation assembly for inflating is arranged on the connecting pipe.

[0013] The inflation assembly comprises a piston pipe fixed to the connecting pipe, a piston plate is connected to the piston pipe through a reciprocating assembly, two one-way valves are mounted in the connecting pipe, the piston pipe is located between the two one-way valves, and the conduction square of the two one-way valves is from the outside of the connecting pipe to the inside of the connecting pipe.

[0014] The reciprocating assembly comprises an extrusion rod slidably connected to one end of the piston pipe, one end of the extrusion rod is fixed to the piston plate, a third spring is sleeved on the side wall of the extrusion rod, an installation shaft is rotatably connected to one side of the first mounting frame, a driving disc is fixed to the installation shaft, a plurality of pressing blocks for pushing against one end of the extrusion rod are fixed in an annular array on the driving disc, and the installation shaft and the first rotating shaft are connected through a transmission assembly.

[0015] The transmission assembly comprises a belt pulley fixed to one end of the first rotating shaft and the installation shaft respectively, and the two belt pulleys are driven through a belt.

[0016] The beneficial effects of the present application are as follows:

[0017] (1) The thin plate pretreatment device of the present invention, through the mutual cooperation of the support assembly, the rotating assembly, the driving assembly and the reset assembly, drives the two L-shaped frames and the thin plate with clamping and limiting to rotate. Through the rotation of the thin plate, the track shot blasting machine can sequentially perform shot blasting treatment on different positions of the thin plate, which facilitates the efficient shot blasting treatment of the thin plate by the track shot blasting machine.

[0018] (2) The thin plate pretreatment device of the present invention uses universal transmission during the shot blasting process, so that the two L-shaped frames are flipped and swaying back and forth between the first mounting frame and the second mounting frame, while the gas is sprayed out to clean the thin plate that is limited and rotated, thereby improving the effect of the thin plate surface treatment. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 A schematic diagram of the overall external structure of the thin plate pretreatment device provided by the present invention;

[0021] Figure 2 A schematic diagram of the conveyor structure of the thin plate pretreatment device provided by the present invention;

[0022] Figure 3 A schematic diagram of the support assembly structure of the thin plate pretreatment device provided by the present invention;

[0023] Figure 4 A schematic diagram of the connecting assembly, pushing assembly, driving assembly, and air-blowing cleaning assembly of the thin plate pretreatment device provided by the present invention;

[0024] Figure 5 A schematic diagram of the air-filling component and reciprocating component of the thin plate pretreatment device provided by the present invention;

[0025] Figure 6 for Figure 4 Enlarged structural diagram at point A;

[0026] Figure 7 for Figure 4 Enlarged structural diagram at point B;

[0027] Figure 8 for Figure 5 A magnified structural diagram at point C.

[0028] In the figure: 1, track shot blasting machine; 201, first mounting frame; 202, second mounting frame; 203, strip plate; 301, first rotating shaft; 302, second rotating shaft; 303, L-shaped frame; 401, spline hole; 402, spline shaft; 501, circular plate; 502, second spring; 601, mounting block; 602, T-shaped rod; 603, first spring; 701, mounting disc; 702, protrusion; 703, pushing pin; 801, gear; 802, connecting frame; 803, rack; 901, air pipe; 902, nozzle; 903, connecting pipe; 1001, piston pipe; 1002, piston plate; 1003, one-way valve; 1101, extrusion rod; 1102, third spring; 1103, mounting shaft; 1104, driving disc; 1105, pressing block; 1201, pulley; 1202, belt; 13, conveyor. DETAILED DESCRIPTION

[0029] The advantages and effects of the present application can be understood by those skilled in the art from the disclosure of the specification. It should be noted that the drawings provided in the following examples are only for illustrative purposes, and the representations are only schematic diagrams, not physical drawings, and should not be understood as limiting the present application. In order to better illustrate the embodiments of the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual size of the product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0030] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components. In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "back" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore the terms used to describe the positional relationship in the drawings should not be understood as limiting the present application to a specific orientation, construction and operation of the device or element indicated, therefore the terms used to describe the positional relationship in the drawings are only for illustrative purposes, and should not be understood as limiting the present application, and for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0031] As Figures 1-8 shown, the thin plate pretreatment device of the present application comprises a track shot blasting machine 1 and a conveyor 13 arranged on the track shot blasting machine 1, a plurality of support assemblies are fixed on the conveyor 13, the support assemblies comprise symmetrically arranged first mounting frames 201 and second mounting frames 202, strip plates 203 are fixed between the first mounting frames 201 and the second mounting frames 202, clamping assemblies for clamping the thin plates and rotating assemblies for rotating the thin plates after clamping are arranged between the first mounting frames 201 and the second mounting frames 202, and air blowing cleaning assemblies for cleaning the oxide skin of the thin plates after shot blasting are arranged on the strip plates 203.

[0032] The rotating assembly comprises a first rotating shaft 301 and a second rotating shaft 302 rotatably connected to the first mounting frame 201 and the second mounting frame 202 respectively, and two L-shaped frames 303 are arranged on the opposite sides of the first mounting frame 201 and the second mounting frame 202, one end of the second rotating shaft 302 is fixed to the L-shaped frame 303, and the first rotating shaft 301 is connected to the L-shaped frame 303 through a connecting assembly. The track shot blasting machine 1 is internally provided with a driving assembly for rotating the first rotating shaft 301. Through the cooperation of the support assembly, the rotating assembly, the driving assembly and the reset assembly, the two L-shaped frames 303 and the clamped and limited sheet are driven to rotate. Through the rotation of the sheet, the track shot blasting machine 1 can sequentially perform shot blasting treatment on different positions of the sheet, facilitating efficient shot blasting treatment of the track shot blasting machine 1 on the sheet.

[0033] Specifically, the clamping assembly comprises a plurality of mounting blocks 601 fixed to the L-shaped frame 303, and a T-shaped rod 602 is slidably connected to each mounting block 601. A first spring 603 is sleeved on the side wall of the T-shaped rod 602. During the limiting process of the placed sheet, each T-shaped rod 602 on the two L-shaped frames 303 is pulled. After the T-shaped rod 602 is pulled, the sheet is placed on the two L-shaped frames 303. After the placement is completed, the pulling of the T-shaped rod 602 is released, and one end of the T-shaped rod 602 is abutted against the placed sheet under the elastic force of the first spring 603. The placed sheet is limited and extruded, so that the sheet is fixed on the two L-shaped frames 303.

[0034] Specifically, the connecting assembly comprises a spline hole 401 opened at one end of the first rotating shaft 301, a spline shaft 402 slidably connected to the spline hole 401, one end of the spline shaft 402 fixed to the L-shaped frame 303, a pushing assembly arranged on the second mounting frame 202 for pushing the second rotating shaft 302, and a reset assembly arranged between the first rotating shaft 301 and the spline shaft 402 for resetting the second rotating shaft 302 after being pushed. Through the spline hole 401 and the spline shaft 402, the transmission of the first rotating shaft 301 and the L-shaped frame 303 is facilitated.

[0035] Specifically, the pushing component includes a mounting plate 701 fixed to one end of the second rotating shaft 302. A protrusion 702 is fixed on the side of the mounting plate 701 facing the second mounting bracket 202. Push pins 703 for pushing against the protrusion 702 are fixed in a circular array on the second mounting bracket 202. During the rotation of the two L-shaped brackets 303, the second rotating shaft 302 is driven to rotate on the second mounting bracket 202. During the rotation of the second rotating shaft 302, the mounting plate 701 is driven to rotate. During the rotation of the mounting plate 701, the protrusion 702 is pushed against each push pin 703 in sequence. Through the pushing action of the protrusion 702 and the push pin 703, the two L-shaped brackets 303 are moved between the first mounting bracket 201 and the second mounting bracket 202 under force.

[0036] Specifically, the reset assembly includes a circular plate 501 fixed on the first rotating shaft 301 and the spline shaft 402. A second spring 502 is connected between the two circular plates 501. The second spring 502 is sleeved on the outside of the first rotating shaft 301. During the movement of the two L-shaped brackets 303, the second spring 502 between the two circular plates 501 is deformed by force to generate elastic force. Through the elastic force of the second spring 502, the two L-shaped brackets 303 are pushed to reset.

[0037] Specifically, the drive assembly includes a gear 801 fixed at one end of the first rotating shaft 301. Inside the track shot blasting machine 1, a rack 803 for meshing and transmission with the gear 801 is fixed through a connecting frame 802. During the conveying of the support assembly, the gear 801 at one end of the first rotating shaft 301 meshes with the rack 803 on the connecting frame 802. Through the mutual meshing transmission between the rack 803 and the gear 801, the first rotating shaft 301 is driven to rotate. During the rotation of the first rotating shaft 301, the two L-shaped frames 303 and the clamping and limiting thin plate are driven to rotate through the connection of the spline hole 401 and the spline shaft 402. Through the rotation of the thin plate, the track shot blasting machine 1 can sequentially perform shot blasting treatment on different positions of the thin plate.

[0038] Specifically, the air-blowing cleaning assembly includes multiple air pipes 901 mounted on a strip plate 203. Each air pipe 901 has a nozzle 902 fixed to its upper end. A connecting pipe 903 is located at the lower end of the strip plate 203. One end of each air pipe 901 is connected to the connecting pipe 903. An inflation assembly for inflation is provided on the connecting pipe 903. The inflation assembly includes a piston tube 1001 fixed to the connecting pipe 903. A piston plate 1002 is connected to the piston tube 1001 via a reciprocating assembly. Two one-way valves 1003 are installed inside the connecting pipe 903, and the piston tube 1001 is located between the two one-way valves 1003. The two one-way valves 1003 are connected from the outside to the inside of the connecting pipe 903. Through the reciprocating assembly, the piston plate 1002 reciprocates on the piston pipe 1001 as the mounting shaft 1103 rotates. Because the two one-way valves 1003 are connected from the outside to the inside of the connecting pipe 903, the reciprocating motion of the piston plate 1002 draws external gas into the inside of the connecting pipe 903 and sprays it out from the nozzles 902 of each air pipe 901. The sprayed gas blows and cleans the limited and rotating thin plate, further improving the efficiency of the thin plate surface treatment.

[0039] Specifically, the reciprocating assembly includes a pressing rod 1101 slidably connected to one end of the piston tube 1001. One end of the pressing rod 1101 is fixed to the piston plate 1002. A third spring 1102 is sleeved on the side wall of the pressing rod 1101. A mounting shaft 1103 is rotatably connected to one side of the first mounting bracket 201. A drive disk 1104 is fixed on the mounting shaft 1103. A plurality of pressure blocks 1105 for pushing against one end of the pressing rod 1101 are fixed in a circular array on the drive disk 1104. The mounting shaft 1103 is connected to the first rotating shaft 301 via a transmission assembly. During the rotation of the mounting shaft 1103, each pressure block 1105 on the drive disc 1104 abuts against one end of the extrusion rod 1101 in sequence. Through the extrusion action of the pressure block 1105 on the extrusion rod 1101 and the reset action of the third spring 1102 on the extrusion rod 1101 and piston plate 1002 after being subjected to force, the piston plate 1002 reciprocates on the piston tube 1001 as the mounting shaft 1103 rotates.

[0040] Specifically, the transmission assembly includes pulleys 1201 fixed to one end of the first rotating shaft 301 and the mounting shaft 1103 respectively. The two pulleys 1201 are driven by a belt 1202. During the rotation of the first rotating shaft 301, the mounting shaft 1103 is driven to rotate by the transmission between the belt 1202 and the two pulleys 1201.

[0041] Working principle: During the shot blasting process of the thin plate, the thin plate to be processed is placed on each support assembly in sequence and limited. During the limiting process of the placed thin plate, each T-shaped rod 602 on the two L-shaped frames 303 is pulled. After the T-shaped rod 602 is pulled, the thin plate is placed on the two L-shaped frames 303. After the placement is completed, the pulling of the T-shaped rod 602 is released, and one end of the T-shaped rod 602 abuts against the placed thin plate under the elastic force of the first spring 603, limiting and squeezing the placed thin plate to fix it on the two L-shaped frames 303.

[0042] After the thin plate is placed and positioned on the support assembly, it is conveyed to the interior of the track shot blasting machine 1 via the conveyor 13. The track shot blasting machine 1 performs shot blasting on the thin plate positioned on the support assembly. During the conveying of the support assembly, the gear 801 at one end of the first rotating shaft 301 meshes with the rack 803 on the connecting frame 802. Through the meshing transmission between the rack 803 and the gear 801, the first rotating shaft 301 is driven to rotate. During the rotation of the first rotating shaft 301, the two L-shaped frames 303 and the thin plate being held and positioned are driven to rotate through the connection between the spline hole 401 and the spline shaft 402. Through the rotation of the thin plate, the track shot blasting machine 1 can sequentially perform shot blasting on different positions of the thin plate, facilitating efficient shot blasting of the thin plate by the track shot blasting machine 1. During the rotation of the two L-shaped frames 303, the second rotating shaft 302 is driven to rotate on the second mounting frame 202. During the rotation of the second rotating shaft 302... The mounting plate 701 is rotated, and during the rotation of the mounting plate 701, the protrusions 702 abut against each of the push pins 703 in sequence. Through the pushing action of the protrusions 702 and the push pins 703, the two L-shaped frames 303 are subjected to force and move between the first mounting frame 201 and the second mounting frame 202. During the movement of the two L-shaped frames 303, the second spring 502 between the two circular plates 501 is deformed and generates elastic force. Through the elastic force of the second spring 502, the two L-shaped frames 303 are pushed to reset. Therefore, through the abutment action of each protrusion 702 against one end of the push pin 703 in sequence and the reset action of the second spring 502, the two L-shaped frames 303 are rotated and oscillated back and forth between the first mounting frame 201 and the second mounting frame 202. Through the oscillation of the L-shaped frames 303, it is easy for the oxide scale present on the thin plate after cleaning to fall off and separate, thereby improving the effect of surface treatment of the thin plate.

[0043] During the rotation of the first rotating shaft 301, the mounting shaft 1103 is driven to rotate through the transmission of the belt 1202 and the two pulleys 1201. During the rotation of the mounting shaft 1103, the pressure blocks 1105 on the drive disc 1104 abut against one end of the extrusion rod 1101 in sequence. Through the extrusion action of the pressure blocks 1105 on the extrusion rod 1101 and the reset action of the third spring 1102 on the extrusion rod 1101 and the piston plate 1002 after being subjected to force, the piston plate 1002 reciprocates on the piston tube 1001 as the mounting shaft 1103 rotates. Since the conduction square of the two one-way valves 1003 is from the outside to the inside of the connecting pipe 903, the reciprocating motion of the piston plate 1002 draws external gas into the inside of the connecting pipe 903 and sprays it out from the nozzles 902 of each air pipe 901. The sprayed gas blows and cleans the limited and rotating thin plate, further improving the surface treatment effect of the thin plate.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A sheet pretreatment device comprising a track shot blaster (1) and a conveyor (13) arranged on the track shot blaster (1), characterized in that: The conveyor (13) is fixed with a plurality of support assemblies, the support assemblies include symmetrically arranged first mounting frame (201) and second mounting frame (202), the first mounting frame (201) and the second mounting frame (202) are fixed with a strip-shaped plate (203), the first mounting frame (201) and the second mounting frame (202) are provided with clamping assemblies for clamping the sheet and rotating assemblies for rotating the sheet after clamping, the strip-shaped plate (203) is provided with air blowing cleaning assemblies for cleaning the oxide skin after shot blasting; The rotating assembly includes first rotating shaft (301) and second rotating shaft (302) rotatably connected to the first mounting frame (201) and the second mounting frame (202) respectively, the opposite side of the first mounting frame (201) and the second mounting frame (202) is provided with two L-shaped frames (303), one end of the second rotating shaft (302) is fixed with the L-shaped frame (303), the first rotating shaft (301) is connected with the L-shaped frame (303) through the connecting assembly, the inside of the track shot blasting machine (1) is provided with a driving assembly for rotating the first rotating shaft (301); The connecting assembly includes a spline hole (401) opened at one end of the first rotating shaft (301), the spline hole (401) is slidably connected with a spline shaft (402), one end of the spline shaft (402) is fixed with the L-shaped frame (303), The driving assembly includes a gear (801) fixed at one end of the first rotating shaft (301), the inside of the track shot blasting machine (1) is fixed with a rack (803) for meshing transmission with the gear (801) through a connecting frame (802).

2. A thin sheet pretreatment device according to claim 1, characterized in that: The clamping assembly includes a plurality of mounting blocks (601) fixed on the L-shaped frame (303), each mounting block (601) is slidably connected with a T-shaped rod (602), a first spring (603) is sleeved on the side wall of the T-shaped rod (602).

3. The thin sheet pretreatment device according to claim 1, characterized by: The second mounting frame (202) is provided with a pushing assembly for pushing the second rotating shaft (302), the first rotating shaft (301) and the spline shaft (402) are provided with a reset assembly for resetting the second rotating shaft (302) after being pushed.

4. A thin sheet pretreatment device according to claim 3, characterized in that: The pushing assembly includes a mounting disc (701) fixed at one end of the second rotating shaft (302), the side of the mounting disc (701) close to the second mounting frame (202) is fixed with a protrusion (702), the second mounting frame (202) is annularly fixed with a pushing pin (703) for abutting and pushing the protrusion (702).

5. The thin sheet pretreatment device according to claim 3, characterized by: The reset assembly includes a circular plate (501) fixed on the first rotating shaft (301) and the spline shaft (402), two circular plates (501) are connected with a second spring (502), the second spring (502) is sleeved on the outside of the first rotating shaft (301).

6. The thin sheet pretreatment device according to claim 1, characterized by: The blowing cleaning assembly comprises a plurality of air pipes (901) mounted on a strip-shaped plate (203), an upper end of each air pipe (901) being fixed with a spray head (902), a lower end of the strip-shaped plate (203) being provided with a connecting pipe (903), one end of each air pipe (901) being in communication with the connecting pipe (903), and the connecting pipe (903) being provided with an inflation assembly for inflation.

7. A thin sheet pretreatment device according to claim 6, characterized in that: The inflation assembly comprises a piston pipe (1001) fixed on the connecting pipe (903), the piston pipe (1001) being connected with a piston plate (1002) through a reciprocating assembly, the inside of the connecting pipe (903) being provided with two one-way valves (1003), the piston pipe (1001) being located between the two one-way valves (1003), and the two one-way valves (1003) being in communication from the outside of the connecting pipe (903) to the inside of the connecting pipe (903).

8. A thin sheet pretreatment device according to claim 7, characterized in that: The reciprocating assembly comprises a pressing rod (1101) slidingly connected to one end of the piston pipe (1001), one end of the pressing rod (1101) being fixed with the piston plate (1002), a third spring (1102) being sleeved on the side wall of the pressing rod (1101), one side of the first mounting frame (201) being rotatably connected with a mounting shaft (1103), the mounting shaft (1103) being fixed with a driving disc (1104), a plurality of pressing blocks (1105) for abutting and pushing one end of the pressing rod (1101) being annularly arranged on the driving disc (1104), and the mounting shaft (1103) and the first rotating shaft (301) being connected through a transmission assembly.

9. A thin sheet pretreatment device according to claim 8, characterized in that: The transmission assembly comprises two belt pulleys (1201) fixed at one end of the first rotating shaft (301) and the mounting shaft (1103) respectively, and the two belt pulleys (1201) being driven through a belt (1202).

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