Sand blasting device of hot rolled strip residual stress on-line regulation and control system, using method of sand blasting device and hot rolled strip residual stress on-line regulation and control system

Abstract

The invention belongs to the technical field of hot rolled strip residual stress control, and particularly relates to a sand blasting device of a hot rolled strip residual stress online regulation and control system, a using method of the sand blasting device and the hot rolled strip residual stress online regulation and control system. The non-uniform residual stress value information of the hot rolled strip is obtained through the obtaining mechanism and transmitted to the determining mechanism, and the determining mechanism determines the sand blasting operation information based on the preset relation between the non-uniform residual stress value information and the sand blasting operation information of the sand blaster; and the control system regulates and controls the sand blasting angle of the sand blaster based on the sand blasting operation information and controls the sand blasting parameters of the sand blaster, the sand blaster sprays sand grains to the hot-rolled strip, and the stress of the hot-rolled strip is regulated and controlled. According to the method, non-uniform residual stress in the production process of the hot-rolled strip is regulated on line, operation is convenient, targeted regulation can be conducted on the part with the large difference value, the strip does not need to be damaged, heat treatment does not need to be conducted on the strip again, and time and labor are saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of hot-rolled plate and strip residual stress control, and in particular relates to a sandblasting device of a hot-rolled plate and strip residual stress online control system, a method for using the sandblasting device, and a hot-rolled plate and strip residual stress online control system. Background Art

[0002] In the prior art, most hot-rolled plate shape control starts from equipment configuration and process configuration. If the internal factors of the plate and strip are considered, uneven residual stress will inevitably be generated during the processing. Excessive residual stress will cause plate shape defects and reduce its mechanical properties.

[0003] The existing hot-rolled strip residual stress control has disadvantages: regulating the residual stress of the strip by changing the cooling process is difficult and challenging; in the process of improving the uneven distribution of residual stress, the temperature gradient or distribution change of the entire strip is studied, which is not targeted at the part with a large special difference; the strip needs to be heat-treated again, which is time-consuming and labor-intensive. Summary of the invention

[0004] The purpose of the present invention is to provide a sandblasting device for an online control system of residual stress of hot-rolled strip, a method for using the sandblasting device and an online control system of residual stress of hot-rolled strip, so as to solve the above problems.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A sandblasting device for an online control system of residual stress of a hot-rolled plate and strip, comprising:

[0007] A sandblaster is used to be arranged above a roller table of an online control system for residual stress of a hot-rolled plate and strip, wherein the roller table is used to transport the hot-rolled plate and strip;

[0008] An angle control component, the movable end of which is connected to the sandblaster;

[0009] A driving mechanism, a driving end of which is connected to the angle regulating assembly;

[0010] An acquisition mechanism, used for acquiring information on non-uniform residual stress values ​​of hot-rolled strips;

[0011] A determination mechanism, for determining the sandblasting operation information based on a preset relationship between the non-uniform residual stress value information and the sandblasting operation information of the sandblaster;

[0012] A control system is used to control the driving mechanism to drive the angle control component to adjust the blasting angle of the sandblaster and control the blasting parameters of the sandblaster based on the sandblasting operation information, wherein the sandblasting parameters at least include flow parameters, pressure parameters and time parameters.

[0013] In a sandblasting device of an online control system for residual stress of a hot-rolled plate and strip of the present invention, the angle control component comprises:

[0014] Mounting frame;

[0015] The top end of the sandblaster support frame is hinged to the mounting frame, and the sandblaster is fixed to the bottom end of the sandblaster support frame.

[0016] In a sandblasting device of an online control system for residual stress of a hot-rolled plate and strip of the present invention, the driving mechanism comprises:

[0017] Gas rod assembly;

[0018] A transition bar has one end hinged to the output end of the gas pressure rod assembly and the other end hinged to the sandblaster support frame.

[0019] A method for using a sandblasting device of an online control system for residual stress of a hot-rolled plate strip, based on the sandblasting device of the online control system for residual stress of a hot-rolled plate strip, the method comprises the following steps:

[0020] Obtaining information on non-uniform residual stress values ​​of the hot-rolled strip;

[0021] Determining the sandblasting operation information based on a preset relationship between the non-uniform residual stress value information and the sandblasting operation information of the sandblaster;

[0022] Based on the sandblasting operation information, the driving mechanism is controlled to drive the angle control component to adjust the sandblasting angle of the sandblaster, and the sandblasting parameters of the sandblaster are controlled, and the sandblasting parameters at least include flow parameters, pressure parameters and time parameters.

[0023] An online control system for residual stress of hot-rolled strip, comprising:

[0024] Roller table, used for conveying hot-rolled strip;

[0025] The sandblasting device of the online control system for residual stress of hot-rolled strip is arranged above the roller.

[0026] In an online control system for residual stress of hot-rolled strip of the present invention, the control system further comprises:

[0027] A safety cover is arranged above the roller conveyor, a gap is left between the safety cover and the roller conveyor for the hot-rolled strip to pass through, and the sandblasting device is arranged on the inner top wall of the safety cover;

[0028] A feed plate is arranged obliquely, the feed plate is arranged below the roller and corresponds to the sand blasting device above and below, and is used to collect the sand particles sprayed by the sand blasting device;

[0029] A water spray device is arranged on one side of the roller and corresponding to the higher end of the feed plate, and is used to flush the sand particles remaining on the hot-rolled strip and flow them to the feed plate;

[0030] The sand bin is communicated with the lower end of the feed plate and is used for storing and recovering sand particles.

[0031] In an online control system for residual stress of hot-rolled strip of the present invention, the sand bin comprises:

[0032] The silo is divided into a first sand storage area and a second sand storage area, the first sand storage area is connected to the second sand storage area, a second baffle is detachably connected between the first sand storage area and the second sand storage area, and a feed port of the first sand storage area is connected to a lower end of the feed plate;

[0033] A first baffle, detachably connected to the feed inlet;

[0034] A drainage area is provided in the first sand storage area and the drainage area is located below the feed inlet;

[0035] A sand outlet, which is provided on the bin body and is located at the bottom end of the second sand storage area;

[0036] A feeding port is provided on the silo and is located at the top of the second sand storage area;

[0037] A water inlet is arranged at the upper part of the bin body, and the water inlet is communicated with the second sand storage area;

[0038] The residual material monitoring area is arranged in the second sand storage area and is used to monitor the residual amount of sand in the second sand storage area.

[0039] In an online control system for residual stress of hot-rolled strip of the present invention, the water spraying device comprises:

[0040] A sprinkler support frame is arranged on one side of the roller table;

[0041] A plurality of sprinkler assemblies are connected to the sprinkler support frame, and the plurality of sprinkler assemblies are arranged at equal intervals along the length direction of the roller table. The water nozzles of the sprinkler assemblies face the hot-rolled strip. The water pipe connection port of the sprinkler assembly is connected to an external water pipe, and the air pipe connection port 2 of the sprinkler assembly is connected to an external air pipe.

[0042] In an online control system for residual stress of hot-rolled strip of the present invention, the feed plate comprises:

[0043] An arc bottom plate is located below the roller and is arranged obliquely, a higher end of the arc bottom plate is arranged corresponding to the plurality of water sprayer assemblies, a lower end of the arc bottom plate is communicated with the feed port, and the arc bottom plate is arranged correspondingly to the sandblaster above and below;

[0044] The side sand scraper is arranged on the concave surface of the arc-shaped bottom plate and is used for scraping off the sand grains remaining on the arc-shaped bottom plate.

[0045] Compared with the prior art, the present invention has the following advantages and technical effects:

[0046] During operation, the uneven residual stress value information of the hot-rolled strip is obtained through the acquisition mechanism and transmitted to the determination mechanism. The determination mechanism determines the sandblasting operation information based on the preset relationship between the uneven residual stress value information and the sandblasting operation information of the sandblaster. The control system controls the driving mechanism to drive the angle control component to adjust the sandblasting angle of the sandblaster and the sandblasting parameters of the sandblaster based on the sandblasting operation information. The sandblaster sprays sand particles toward the hot-rolled strip to adjust the stress of the hot-rolled strip.

[0047] The present invention realizes online regulation of uneven residual stress in the production process of hot-rolled plates and strips, is easy to operate, and can perform targeted regulation on locations with larger differences, without the need to destroy the plates and strips or re-heat treat the plates and strips, thus saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0049] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0050] Figure 2 It is a front view of the present invention;

[0051] Figure 3 It is a structural schematic diagram of the sandblasting device in the present invention;

[0052] Figure 4 It is a structural schematic diagram of the water spray device in the present invention;

[0053] Figure 5 A top view of the feed plate in the present invention;

[0054] Among them, 1. Sand bin; 102. First sand storage area; 1021. Feed inlet; 1022. First baffle; 1023. Drainage area; 103. Second sand storage area; 1031. Second baffle; 1032. Feed inlet; 1033. Sand outlet; 1034. Water inlet; 104. Residual material monitoring area; 2. Feed plate; 201. Curved bottom plate; 202. Side sand scraper; 3. Mounting frame; 301. Height limit hole; 401, sandblaster; 401-2, sand pipe connection port; 401-3, air pipe connection port 1; 402, gas pressure rod assembly; 4022, transition strip; 403, sandblaster support frame; 5, water spray device; 501, sprinkler assembly; 501-1, water nozzle; 501-2, water pipe connection port; 501-3, air pipe connection port 2; 503, sprinkler support frame; 6, safety cover. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] Reference Figures 1 to 5 The present invention discloses a sandblasting device of an online control system for residual stress of hot-rolled strip, comprising:

[0058] The sandblaster 401 is used to be arranged above the roller of the online control system of residual stress of hot-rolled strip, and the roller is used to transport the hot-rolled strip;

[0059] An angle control component, the movable end of which is connected to the sandblaster 401;

[0060] A driving mechanism, a driving end of which is connected to the angle control component;

[0061] An acquisition mechanism, used for acquiring information on non-uniform residual stress values ​​of hot-rolled strips;

[0062] A determination mechanism for determining the sandblasting operation information based on a preset relationship between the non-uniform residual stress value information and the sandblasting operation information of the sandblaster 401;

[0063] The control system is used to control the driving mechanism to drive the angle control component to adjust the blasting angle of the sandblaster 401 and control the blasting parameters of the sandblaster 401 based on the sandblasting operation information. The sandblasting parameters at least include flow parameters, pressure parameters and time parameters.

[0064] A plurality of sandblasters 401 are provided, and the plurality of sandblasters 401 are distributed in an array. A sand pipe connection port 401 - 2 of the sandblaster 401 is connected to an external sand pipe, and an air pipe connection port 401 - 3 of the sandblaster 401 is connected to an external air pipe.

[0065] In one feasible solution, the angle control component includes:

[0066] Mounting frame 3;

[0067] The top end of the sandblaster support frame 403 is hinged to the mounting frame 3 , and the sandblaster 401 is fixedly connected to the bottom end of the sandblaster support frame 403 .

[0068] In a feasible solution, the driving mechanism includes:

[0069] Gas rod assembly 402;

[0070] One end of the transition bar 4022 is hinged to the output end of the gas pressure rod assembly 402 , and the other end is hinged to the sandblaster support frame 403 .

[0071] One end of the transition bar 4022 is hinged to the movable end of the gas pressure rod assembly 402 , and the other end of the transition bar 4022 is hinged to the side wall of the sandblaster support frame 403 .

[0072] The gas pressure rod assembly 402 can also use a pneumatic telescopic cylinder.

[0073] The transition bar 4022 is hinged to the sandblaster support frame 403 and the gas pressure rod assembly 402 as a connecting piece, and converts the linear motion of the gas pressure rod assembly 402 into the angular motion of the sandblaster 401 .

[0074] A method for using a sandblasting device of an online control system for residual stress of a hot-rolled plate strip, based on the sandblasting device of the online control system for residual stress of a hot-rolled plate strip, the method comprises the following steps:

[0075] Obtain information on the non-uniform residual stress value of hot-rolled strip;

[0076] Determining the sandblasting operation information based on a preset relationship between the non-uniform residual stress value information and the sandblasting operation information of the sandblaster 401;

[0077] Based on the sandblasting operation information, the driving mechanism drives the angle control component to control the sandblasting angle of the sandblaster 401 and controls the sandblasting parameters of the sandblaster 401 . The sandblasting parameters at least include flow parameters, pressure parameters and time parameters.

[0078] During operation, the uneven residual stress value information of the hot-rolled strip is obtained through the acquisition mechanism and transmitted to the determination mechanism. The determination mechanism determines the sandblasting operation information based on the preset relationship between the uneven residual stress value information and the sandblasting operation information of the sandblaster 401. The control system controls the driving mechanism to drive the angle control component to adjust the sandblasting angle of the sandblaster 401 and the sandblasting parameters of the sandblaster 401 based on the sandblasting operation information. The sandblaster 401 sprays sand particles toward the hot-rolled strip to adjust the stress of the hot-rolled strip.

[0079] The present invention realizes online regulation of uneven residual stress in the production process of hot-rolled plates and strips, is easy to operate, and can perform targeted regulation on locations with larger differences, without the need to destroy the plates and strips or re-heat treat the plates and strips, thus saving time and effort.

[0080] The sandblaster 401 is controlled by a control system signal, and the sandblasting flow, pressure, time and angle are adjusted according to the uneven residual stress value. Single-point spraying or multi-point spraying can be performed according to the operation requirements; multiple rows of sandblasters 401 are arranged at equal intervals along the length direction of the roller, and the number of single-row sandblasters 401 is adjusted according to the width of the hot-rolled strip.

[0081] An online control system for residual stress of hot-rolled strip, comprising:

[0082] Roller table, used for conveying hot-rolled strip;

[0083] The sandblasting device of the online control system of residual stress of hot-rolled strip is arranged above the roller.

[0084] In a feasible solution, the control system also includes:

[0085] A safety cover 6 is arranged above the roller, a gap for the hot-rolled strip to pass through is left between the safety cover 6 and the roller, and a sandblasting device is arranged on the inner top wall of the safety cover 6;

[0086] The safety cover 6 encloses the working area to prevent splashing and contaminating the workshop, and at the same time provides an installation location for the sandblasting device.

[0087] When the rolling mill is not working or stress adjustment is not required, the safety cover 6 is flipped up and located on one side of the roller table, and the control system is not working.

[0088] A feed plate 2 is arranged at an angle, and the feed plate 2 is arranged below the roller and corresponds to the upper and lower sides of the sandblasting device, and is used to collect the sand particles sprayed by the sandblasting device;

[0089] A water spray device 5 is arranged on one side of the roller and corresponds to the higher end of the feed plate 2, and is used to flush the sand particles remaining on the hot-rolled strip and flow them to the feed plate 2;

[0090] The sand bin 1 is connected to the lower end of the feed plate 2 and is used for storing and recovering sand particles.

[0091] The sandblasting device is located on the mounting frame 3 inside the safety cover 6, the cross bar of the mounting frame 3 is hinged to one side of the sandblaster support frame 403, the sandblaster 401 is fixed to the other side of the sandblaster support frame 403, and the pneumatic rod assembly 402 is fixed to the cross bar of another mounting frame 3; the transition bar 4022 converts the linear motion of the pneumatic rod assembly 402 into the angular change motion of the sandblaster 401.

[0092] In a feasible solution, the sand bin 1 includes:

[0093] The warehouse body is divided into a first sand storage area 102 and a second sand storage area 103, the first sand storage area 102 is connected to the second sand storage area 103, a second baffle 1031 is detachably connected between the first sand storage area 102 and the second sand storage area 103, and a feed port 1021 of the first sand storage area 102 is connected to a lower end of the feed plate 2;

[0094] A first baffle 1022 is detachably connected to the feed inlet 1021;

[0095] The drainage area 1023 is arranged in the first sand storage area 102 and the drainage area 1023 is located below the feed inlet 1021;

[0096] A sand outlet 1033 is provided on the warehouse body and is located at the bottom end of the second sand storage area 103;

[0097] A material discharge port 1032 is provided on the silo and is located at the top of the second sand storage area 103;

[0098] A water inlet 1034 is provided at the upper part of the bin body, and the water inlet 1034 is communicated with the second sand storage area 103;

[0099] The residual material monitoring area 104 is arranged in the second sand storage area 103 and is used to monitor the residual amount of sand in the second sand storage area 103 .

[0100] The sand particles on the hot-rolled strip fall onto the feed plate 2 under the action of the water spray device 5, the first baffle 1022 opens, the used wet sand enters the first sand storage area 102, the excess water flows to the drainage area 1023 through the sand filter, and the wet sand flows out from the sand outlet 1033 of the second sand storage area 103. When the wet sand reaches the lowest scale of the residual material monitoring area 104, the second baffle 1031 opens, and the wet sand in the first sand storage area 102 enters the second sand storage area 103, so as to circulate.

[0101] The warehouse body is cylindrical, and circular holes are respectively left at the top of the first sand storage area 102 and the top of the second sand storage area 103 for easy observation of the interior of the warehouse body.

[0102] When adding sand for the first time, the material is added manually from the discharge port 1032. The discharge port 1032 is placed at an angle, and the entrance is equipped with a sand filter to filter out large particles of sand. At the same time, a certain proportion of water is added from the water inlet 1034 to mix with the sand to form wet sand.

[0103] In a feasible solution, the water spraying device 5 includes:

[0104] A sprinkler support frame 503 is arranged on one side of the roller table;

[0105] A plurality of sprinkler assemblies 501 are connected to a sprinkler support frame 503, and the plurality of sprinkler assemblies 501 are arranged at equal intervals along the length direction of the roller table. The water nozzles 501-1 of the sprinkler assemblies 501 face the hot-rolled strip, the water pipe connection port 501-2 of the sprinkler assembly 501 is connected to an external water pipe, and the air pipe connection port 2 501-3 of the sprinkler assembly 501 is connected to an external air pipe.

[0106] The sprinkler assembly 501 is fixed on the cross bar of the sprinkler support frame 503, the water nozzle 501-1 serves as a water outlet, the water pipe connection port 501-2 is connected to an external water pipe, and the air pipe connection port 501-3 is connected to an external air pipe. The sprinkler assembly 501 uses compressed air as power to flush the wet sand on the working area and the wet sand on the roller to the first sand storage area 102.

[0107] The sprinkler support frame 503 is fixedly connected to another mounting frame 3. Both ends of the mounting frame 3 can be detachably connected to the supporting legs. The supporting legs are provided with height limiting holes 301. The two ends of the mounting frame 3 are respectively inserted into the two corresponding height limiting holes 301 on the two supporting legs to adjust the height of the mounting frame 3.

[0108] The sprinkler assembly 501 is controlled by a control system signal, and the spraying pressure, flow rate, and time of the sprinkler assembly 501 are adjusted according to the amount of sand on the plate strip so that the wet sand enters the first sand storage area 102;

[0109] In a feasible solution, the feed plate 2 comprises:

[0110] The arc bottom plate 201 is located below the roller and is tilted. The higher end of the arc bottom plate 201 is corresponding to the plurality of water sprayer assemblies 501, and the lower end of the arc bottom plate 201 is connected to the feed port 1021. The arc bottom plate 201 and the sandblaster 401 are correspondingly arranged up and down.

[0111] The side scraper 202 is disposed on the concave surface of the arc-shaped bottom plate 201 and is used to scrape off the sand particles remaining on the arc-shaped bottom plate 201 .

[0112] After high-pressure sand blasting, part of the wet sand is attached to the feed plate 2, and part enters the first sand storage area 102. The wet sand attached to the arc bottom plate 201 enters the first sand storage area 102 through the clockwise rotation of the side scraper 202.

[0113] In a feasible solution, one side of the safety cover 6 is hinged on the bracket and is transmission-connected with a driving assembly, the driving assembly is electrically connected to the control system, and the hinge between the safety cover 6 and the bracket is close to the sand bin 1.

[0114] The rotation angle of the safety cover 6 is 0° to 100°

[0115] Working process:

[0116] The uneven residual stress value of the plate strip is monitored by an external monitoring device and the information is transmitted to the control system, which processes the information to determine the operation range; when the stress area to be adjusted of the plate strip is close to the safety cover 6, the control system controls the safety cover 6 to flip and be located directly above the plate strip and set horizontally, at which time the water spray device 5 is located inside the safety cover 6; the control system controls the sandblasting device to blast sand onto the plate strip to adjust the residual stress of the plate strip; the water spray device 5 sprays water to flush the sand above the plate strip down and land on the curved bottom plate 201, and then flows along the curved bottom plate 201. The slope of the curved bottom plate 201 enters the first sand storage area 102 and filters out excess moisture. The side scraper 202 is used to scrape off the residual sand on the curved bottom plate 201. When the residual material monitoring area 104 detects that the height of the sand in the second sand storage area 103 reaches the lowest point, the second baffle 1031 is opened, and the sand enters the second sand storage area 103 from the first sand storage area 102. The sand in the second sand storage area 103 flows out from the sand outlet 1033 and is sent to the sand blasting device by an external sand delivery device through an external sand pipe, thereby realizing the recycling of the sand.

[0117] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0118] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A sandblasting device for an online control system of residual stress of hot-rolled strip, characterized in that: include: A sandblaster (401) is used to be arranged above a roller table of an online control system for residual stress of a hot-rolled plate and strip, wherein the roller table is used to transport the hot-rolled plate and strip; An angle control component, the movable end of which is connected to the sandblaster (401); A driving mechanism, a driving end of which is connected to the angle regulating assembly; An acquisition mechanism, used for acquiring information on non-uniform residual stress values ​​of hot-rolled strips; A determination mechanism, used for determining the sandblasting operation information based on a preset relationship between the non-uniform residual stress value information and the sandblasting operation information of the sandblaster (401); A control system is used to control the driving mechanism to drive the angle control component to control the sandblasting angle of the sandblaster (401) and control the sandblasting parameters of the sandblaster (401) based on the sandblasting operation information, wherein the sandblasting parameters at least include flow parameters, pressure parameters and time parameters.

2. The sandblasting device of the online control system for residual stress of hot-rolled strip according to claim 1 is characterized in that: The angle control component comprises: Mounting frame (3); A sandblaster support frame (403) has a top end hinged to the mounting frame (3), and the sandblaster (401) is fixedly connected to the bottom end of the sandblaster support frame (403).

3. The sandblasting device of the online control system for residual stress of hot-rolled strip according to claim 2 is characterized in that: The driving mechanism comprises: Gas rod assembly (402); A transition bar (4022) has one end hinged to the output end of the pneumatic rod assembly (402) and the other end hinged to the sandblaster support frame (403).

4. A method for using a sandblasting device of an online control system for residual stress of a hot-rolled plate strip, based on the sandblasting device of an online control system for residual stress of a hot-rolled plate strip according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: Obtaining information on non-uniform residual stress values ​​of the hot-rolled strip; Determining the sandblasting operation information based on a preset relationship between the non-uniform residual stress value information and the sandblasting operation information of the sandblaster (401); Based on the sandblasting operation information, the driving mechanism is controlled to drive the angle control component to control the sandblasting angle of the sandblaster (401), and the sandblasting parameters of the sandblaster (401) are controlled, wherein the sandblasting parameters at least include a flow parameter, a pressure parameter and a time parameter.

5. An online control system for residual stress of hot-rolled strip, characterized in that: include: Roller table, used for conveying hot-rolled strip; The sandblasting device of the online control system of residual stress of hot-rolled strip according to any one of claims 1 to 3 is arranged above the roller.

6. The online control system for residual stress of hot-rolled strip according to claim 5, characterized in that: The control system also includes: A safety cover (6) is arranged above the roller conveyor, a gap for the hot-rolled strip to pass through is left between the safety cover (6) and the roller conveyor, and the sandblasting device is arranged on the inner top wall of the safety cover (6); A feed plate (2) is arranged at an angle, the feed plate (2) being arranged below the roller and corresponding to the upper and lower sides of the sandblasting device, and being used to collect sand particles sprayed by the sandblasting device; A water spray device (5) is arranged on one side of the roller and corresponds to the higher end of the feed plate (2), and is used to flush the sand particles remaining on the hot-rolled strip and flow them toward the feed plate (2); The sand bin (1) is connected to the lower end of the feed plate (2) and is used for storing and recovering sand particles.

7. The online control system for residual stress of hot-rolled strip according to claim 6, characterized in that: The sand bin (1) comprises: The silo body is divided into a first sand storage area (102) and a second sand storage area (103), the first sand storage area (102) and the second sand storage area (103) are connected, a second baffle (1031) is detachably connected between the first sand storage area (102) and the second sand storage area (103), and a feed port (1021) of the first sand storage area (102) is connected to a lower end of the feed plate (2); A first baffle (1022) detachably connected to the feed port (1021); A drainage area (1023) is arranged in the first sand storage area (102), and the drainage area (1023) is located below the feed inlet (1021); A sand outlet (1033) is provided on the bin body and is located at the bottom end of the second sand storage area (103); A material discharge port (1032) is provided on the silo body and is located at the top of the second sand storage area (103); A water inlet (1034) is arranged at the upper part of the bin body, and the water inlet (1034) is connected to the second sand storage area (103); The residual material monitoring area (104) is arranged in the second sand storage area (103) and is used to monitor the residual amount of sand particles in the second sand storage area (103).

8. The online control system for residual stress of hot-rolled strip according to claim 7, characterized in that: The water spray device (5) comprises: A sprinkler support frame (503) is arranged on one side of the roller conveyor; A plurality of sprinkler assemblies (501) are connected to the sprinkler support frame (503); the plurality of sprinkler assemblies (501) are arranged at equal intervals along the length direction of the roller; the water nozzles (501-1) of the sprinkler assemblies (501) face the hot-rolled strip; the water pipe connection port (501-2) of the sprinkler assembly (501) is connected to an external water pipe; and the second air pipe connection port (501-3) of the sprinkler assembly (501) is connected to an external air pipe.

9. The online control system for residual stress of hot-rolled strip according to claim 8, characterized in that: The feed plate (2) comprises: An arc-shaped bottom plate (201) is located below the roller and is arranged obliquely, the higher end of the arc-shaped bottom plate (201) is arranged correspondingly to the plurality of water sprayer assemblies (501), the lower end of the arc-shaped bottom plate (201) is connected to the feed port (1021), and the arc-shaped bottom plate (201) and the sandblaster (401) are arranged correspondingly up and down; A side sand scraper (202) is arranged on the concave surface of the arc-shaped bottom plate (201) and is used to scrape off sand particles remaining on the arc-shaped bottom plate (201).

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