Rectangular steel cavity sand blocking device and method

Abstract

A rectangular steel cavity sand blocking device belongs to the technical field of railway freight manufacturing and comprises a baffle, a locking piece and a supporting plate. The baffle is an L-shaped plate; the number of the locking pieces is at least two, each locking piece comprises a bolt and a nut which are matched with each other, and the nuts are connected to the upper surface of the horizontal end of the baffle; the supporting plates are connected to the inner sides of the vertical ends of the baffles. A rectangular steel cavity sand blocking method comprises the six steps of classifying, placing on a lifting conveying trolley, installing a sand blocking device, locking the sand blocking device and rectangular steel, conveying the rectangular steel for treatment, taking down the sand blocking device in the discharging and storing process, and repeatedly using. Multiple pieces of rectangular steel can be plugged at the same time, operation is easy, and the working efficiency is high; the device is simple in structure, convenient to use and low in manufacturing cost; meanwhile, the heights of the baffles and the supporting plates can be exchanged according to the heights of different rectangular steel sections, so that different use requirements are met, and the use range is wide.

Description

Technical Field

[0001] The present invention belongs to the technical field of railway freight manufacturing, and relates to a device and method for cavity sand blocking during the rust removal process of rectangular steel, in particular to a rectangular steel cavity sand blocking device and method. Background Art

[0002] Currently, in the railway freight car manufacturing industry, surface rust removal and primer pre - coating are required for profiles. There are many rust removal methods, but the most commonly used rust removal method in the industry is still shot blasting (including steel sand, steel wire segments, hereinafter collectively referred to as steel shot). A high - power motor drives the projectile blades to rotate at high speed, so that the steel shot impacts the surface of the rectangular steel under the action of centrifugal force, thoroughly removing the rust, oxides and dirt on the surface of the rectangular steel. Inevitably, the steel shot splashes into the cavity from the cavity openings at both ends of the rectangular steel during high - speed movement. There are the following three methods for dealing with the steel shot splashing into the cavity:

[0003] 1. In the traditional industry, the steel shot entering the cavity is not disposed of during the rust removal process, and only in the subsequent process, on a special station, means such as high - pressure air are used to blow out the steel shot in the cavity;

[0004] 2. After the subsequent process cuts (saw - cuts) the rectangular steel, the overhead crane cooperates and then inverts it to pour out the steel shot and the like in the cavity;

[0005] 3. The currently common method is to use some objects such as rags, wooden wedges, soft foams, etc. to block the cavity openings on both sides of the rectangular steel during the rust removal process of the rectangular steel, so as to achieve the purpose of isolating the steel shot from entering the cavity.

[0006] However, these steel shot treatment methods have the following problems:

[0007] 1. The remaining steel shot in the cavity changes with the process flow of the rectangular steel and flows into different process teams and process workshops, so that each process team or process workshop needs to sort out the remaining steel shot on the workbench and the ground every day, thus increasing the labor intensity;

[0008] 2. The falling of the steel shot flowing into different process teams and process workshops poses a safety risk of slipping and falling for employees, thus increasing the safety risk during the manufacturing process;

[0009] 3. Using objects such as wooden wedges, soft foams and special rubbers to block the cavity of the rectangular steel to prevent the steel shot from splashing into the cavity requires blocking the cavity of each rectangular steel during rust removal, with a large workload; moreover, the wooden wedges or special rubbers are not easy to fix in the cavity and have the risk of falling at any station during processes such as pre - heating, rust removal, painting, drying and blanking, especially falling into the shot blasting chamber, which poses a greater equipment safety risk to the rust removal equipment. Summary of the Invention

[0010] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a rectangular steel cavity sand blocking device and method, which are used to solve the technical problems that in the process of rust removal of rectangular steel, the cavity is not blocked, resulting in steel shots entering the cavity, increasing the cleaning difficulty, or the cavity blocking operation is complex, with a large workload and poor blocking stability.

[0011] To achieve the above purpose and other related purposes, the present invention provides a rectangular steel cavity sand blocking device, which includes a baffle, a locking member and a support plate;

[0012] The baffle is an L-shaped plate, including a horizontally-extended end and a vertically-extended end integrally formed;

[0013] At least two groups of locking members are arranged along the length direction of the baffle, and the two groups of locking members are symmetrically arranged on the upper surface of the horizontal end of the baffle. Each group of locking members includes a bolt and a nut that match each other, and the nut is fixedly connected to the upper surface of the horizontal end of the baffle;

[0014] Several groups of support plates are uniformly arranged along the length direction of the baffle, and several groups of support plates are fixedly connected to the inner side of the vertical end of the baffle.

[0015] Preferably, in any of the above solutions, a handle is fixedly connected to the upper end of the bolt.

[0016] Preferably, in any of the above solutions, a connection hole is opened at the center of the head of the bolt, and the lower end of the handle extends into the connection hole and is welded and fixed to the bolt.

[0017] Preferably, in any of the above solutions, each group of support plates includes a bottom plate, and both ends of the bottom plate are bent 90° in the same direction to form two side plates. The bottom plate is fixedly connected to the inner side of the vertical end of the baffle, and the two side plates are arranged parallel to the horizontal end of the baffle. The distance between the bottom surface of the lower side plate of the support plate and the bottom of the vertical end of the baffle is s, and s = t + 2 mm, where t is the wall thickness of the rectangular steel.

[0018] Preferably, in any of the above solutions, an installation cavity is formed between the lower surface of the horizontal end of the baffle and the upper surface of the upper side plate of the support plate, and the upper wall of the rectangular steel is clamped in the installation cavity.

[0019] Preferably, in any of the above solutions, the thickness of the installation cavity is g, and g ≥ t + Δ1, where

[0020] t is the wall thickness of the rectangular steel;

[0021] Δ1 is the distance between the upper side plate of the support plate and the upper wall of the rectangular steel, and 1 ≤ Δ1 ≤ 2 mm.

[0022] A rectangular steel cavity sand blocking method includes the following steps:

[0023] S1. Classify the rectangular steel to be derusted and painted. The classification criterion is that the rectangular steels with the same height b of the cross-section of the rectangular steel cavity are classified into one category;

[0024] S2. Place the rectangular steels to be rust-proof and painted in the same group evenly on the lifting and conveying trolley, and the distance e between any two adjacent rectangular steels is e;

[0025] S3. Place two sets of sand-blocking devices at both ends of the rectangular steel to be rust-proof and painted. Among them, the support plate is placed in the rectangular steel cavity, the horizontal end of the baffle is in contact with the upper wall of the rectangular steel, and the vertical end of the baffle is in contact with the end wall of the rectangular steel;

[0026] S4. Rotate the handle to make the upper side wall of the support plate tightly fit without clearance with the upper wall in the rectangular steel cavity to realize the locking between the sand-blocking device and the rectangular steel;

[0027] S5. Use the conveying trolley to convey the rectangular steel to be derusted and painted to the conveying roller path for preheating, rust prevention, painting, drying and blanking processes;

[0028] S6. In the blanking and storage process, remove the sand-blocking device and reuse it.

[0029] Preferably in any of the above solutions, in S1, when the height b of the rectangular steel cross-section is the same, the range of the length a of the rectangular steel cross-section is: 100 mm ≤ a ≤ 180 mm.

[0030] Preferably in any of the above solutions, in S2, e ≥ b.

[0031] Preferably in any of the above solutions, in S4, when in the locked state, the distance h between the lower side plate of the support plate and the inner wall of the rectangular steel cavity is h = g.

[0032] As described above, a sand-blocking device and method for a rectangular steel cavity of the present invention have the following beneficial effects:

[0033] 1. In the present invention, multiple rectangular steels can be blocked at one time, the operation is simple, the working efficiency is high, and the labor intensity can be effectively reduced.

[0034] 2. In the present invention, the rectangular steel cavity can be blocked and shielded quickly before derusting the rectangular steel, and the blocking and shielding stability is high, which can effectively prevent the device from falling off during the working process and causing danger.

[0035] 3. In the present invention, the device is all made of riveted and welded structures, the structure is simple, the use is convenient, and the manufacturing cost of the device is low. The baffle, the support plate and the locking parts are all processed with the remaining corner materials of the layout, which can effectively save costs.

[0036] 4. In the present invention, the heights of the baffle and the support plate can be adjusted according to rectangular steels of different specifications, so as to meet different usage requirements and effectively expand the applicable range of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Shown are the three-view drawings of the sand retaining device for the rectangular steel cavity.

[0038] Figure 2 Shown are the three-view drawings of the baffle.

[0039] Figure 3 Shown is the unfolded drawing and the laser cutting program drawing of the baffle.

[0040] Figure 4 Shown are the three-view drawings of the support plate.

[0041] Figure 5 Shown is the unfolded drawing and the laser cutting program drawing of the support plate.

[0042] Figure 6 Shown is the structural schematic diagram of the locking member.

[0043] Figure 7 Shown is the schematic diagram of the handle.

[0044] Figure 8 Shown is the schematic diagram of the bolt.

[0045] Figure 9 Shown is the schematic diagram of the nut.

[0046] Figure 10 Shown is the front view of the sand retaining device for the rectangular steel cavity of the P70 gondola car □163×100×5 during operation.

[0047] Figure 11 Shown is the top view of the sand retaining device for the rectangular steel cavity of the P70 gondola car □163×100×5 during operation.

[0048] Figure 12 Shown is the schematic diagram of the sand retaining device for the rectangular steel cavity in the unlocked state.

[0049] Figure 13 Shown is the schematic diagram of the sand retaining device for the rectangular steel cavity in the locked state.

[0050] Figure 14 Shown is the cross-sectional view of the rectangular steel cavity.

[0051] Figure 15 Shown is Figure 12 the enlarged schematic diagram at position A in

[0052] Figure 16 Shown is Figure 13 the enlarged schematic diagram at position B in

[0053] Figure 17 The display shows the front view of the C70E open car □140×100×5 rectangular steel cavity sand retaining device when it is working.

[0054] Figure 18 The display shows a top view of the C70E open car □140×100×5 rectangular steel cavity sand retaining device when it is working.

[0055] Component number description

[0056] 1- baffle; 2- support plate; 201- bottom plate; 202- side plate; 3- locking piece; 301- handle; 4- bolt; 5- nut; 6- upper side beam of P70 boxcar; 7- upper side beam of C70 open car; 8- baffle weight-reducing hole; 9- plug welding hole; 10- baffle folding line; 11- positioning welding point; 12- support plate folding line; 13- positioning welding hole; 14- support plate weight-reducing hole; 15- notch; 16- installation cavity. DETAILED DESCRIPTION

[0057] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0058] See also Figures 1 to 18 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0059] See also Figures 1 - 18

[0060] Example 1

[0061] The present invention provides a rectangular steel cavity sand retaining device, comprising a retaining plate 1, a locking member 3 and a supporting plate 2;

[0062] The baffle 1 is an L-shaped plate, including an integrally formed horizontal end and a vertical end;

[0063] The locking members 3 are provided with at least two groups along the length direction of the baffle 1, and the two groups of locking members 3 are symmetrically arranged on the upper surface of the horizontal end of the baffle 1. Each group of locking members 3 includes a bolt 4 and a nut 5 that match each other, and the nut 5 is fixedly connected to the upper surface of the horizontal end of the baffle 1;

[0064] A number of groups of the support plates 2 are uniformly arranged along the length direction of the baffle 1, and the number of groups of support plates 2 are fixedly connected to the inner side of the vertical end of the baffle 1.

[0065] When in use in this embodiment, the rectangular steel cavity sand blocking device includes a baffle 1, a locking member 3 and a support plate 2. The baffle 1 is bent at a 90° angle along the baffle folding line 10 to form an L-shaped plate, including an integrally formed horizontal end and a vertical end. The horizontal end of the baffle 1 is located on the upper surface of the rectangular steel, and the vertical end of the baffle 1 contacts the side wall of the rectangular steel cavity and seals the rectangular steel cavity.

[0066] The height of the vertical end of the baffle 1 is c, and c = b + 3t + Δ1, where b is the height of the cross-section of the rectangular steel, t is the wall thickness of the rectangular steel, and Δ1 is the distance between the upper side plate 202 of the support plate 2 and the upper wall of the rectangular steel, and 1 ≤ Δ1 ≤ 2 mm.

[0067] The height of the support plate 2 is d, and d = b - 3t - Δ2, where b is the height of the cross-section of the rectangular steel, t is the wall thickness of the rectangular steel, and Δ2 is the distance between the bottom of the vertical end of the baffle 1 and the lower wall of the rectangular steel, and 1 ≤ Δ2 ≤ 2 mm.

[0068] Due to the uncontrollable external factors such as 1-3 mm of flash, burrs, etc. existing in the cross-section of both ends of the rectangular steel incoming material cavity, which are obstructive to the sand blocking device being placed inside the rectangular steel cavity. Therefore, in this embodiment, the height of the vertical end of the baffle 1 is c = b + 3t + 2 mm, and the height of the support plate 2 is d = b - 3t - 2 mm. There will be no risk that the gap between the lower end of the support plate 2 and the inner wall of the rectangular steel cavity is too large and the steel shot enters the cavity, thus realizing the effective sealing of the rectangular steel cavity.

[0069] In order to ensure the stability and operability of the connection between the baffle 1 and the rectangular steel, the support plate 2 and the locking member 3 that cooperate with the baffle 1 are designed in this embodiment.

[0070] Among them, the support plate 2 includes a bottom plate 201. The two ends of the bottom plate 201 are bent at a 90° angle in the same direction along the support plate folding line 12 to form two side plates 202. The bottom plate 201 is fixedly welded to the inner side of the vertical end of the baffle 1, and the two side plates 202 are arranged parallel to the horizontal end of the baffle 1, ensuring that the upper side plate 202 can be closely attached to the rectangular steel during the fastening process, thereby ensuring the firmness of the connection between the two.

[0071] The distance between the bottom surface of the lower side plate 202 of the support plate 2 and the bottom of the vertical end of the baffle 1 is s, and s = t + 2 mm, where t is the wall thickness of the rectangular steel.

[0072] A number of support plates 2 are uniformly arranged along the length direction of the baffle 1, and the support plates 2 are located inside the rectangular steel cavity. An installation cavity 16 is formed between the upper side plate 202 of the support plate 2 and the horizontal end of the baffle 1. During the installation process of the rectangular steel, the upper wall of the rectangular steel is clamped in the installation cavity 16.

[0073] The locking member 3 includes a bolt 4 and a nut 5 that match each other, and the nut 5 is fixedly connected to the upper surface of the horizontal end of the baffle 1. In order to facilitate the staff to rotate the bolt 4, in this embodiment, a handle 301 is fixedly connected to the top of the bolt 4. Specifically, a connection hole is opened at the center of the head of the bolt 4, and the lower end of the handle 301 extends into the connection hole and is welded and fixed.

[0074] During the working process, the rectangular steels are arranged neatly at a specified distance, and then a number of support plates 2 on the two baffles 1 are respectively inserted into the rectangular steel cavity. Then, the handle 301 is rotated to make the upper side plate 202 of the support plate 2 tightly fit with the upper wall in the rectangular steel cavity without gaps, so as to lock the sand blocking device and the rectangular steel. After that, the preheating, rust prevention, painting, drying and blanking processes are carried out. During the blanking process after the process is completed, the sand blocking device can be removed and reused.

[0075] During the whole process, the operation is simple, the connection between the sand blocking device and the rectangular steel cavity is firm, which can effectively prevent the sand blocking device from falling during the process, thereby effectively preventing the steel shot from entering the rectangular steel cavity and improving the safety during the working process.

[0076] As a further description of the above embodiment, plug welding holes 9 arranged in a rectangle are provided at the welding positions of the baffle 1 and the support plate 2.

[0077] In this embodiment, in order to reduce the weight of the baffle 1, thereby reducing the weight of the whole device and facilitating the staff to pick it up, a number of baffle weight reduction holes 8 are opened on the baffle 1. The baffle weight reduction holes 8 are opened between two adjacent support plates 2.

[0078] In this embodiment, a number of positioning welding holes 13 for positioning welding of the baffle 1 and the nut 5 are provided on the horizontal end of the baffle 1.

[0079] As a further description of the above embodiment, positioning welding holes 13 for welding with the baffle 1 are opened in the middle of the support plate 2. At the same time, support plate weight reduction holes 14 are opened at the positions on both sides of the positioning welding holes 13 on the support plate 2. The support plate weight reduction holes 14 are respectively located on both sides of the support plate folding line 12, which can reduce the weight of the support plate 2, thereby reducing the weight of the device.

[0080] In this embodiment, a plurality of notches 15 are provided on the support plate 2 to avoid flash and burrs on the inner side of the cavity section at both ends of the rectangular steel. The opening position and size of the notches 15 are determined according to the shape and size of the rectangular steel.

[0081] As a further description of the above embodiment, at least two groups of locking members 3 are provided, and the locking members 3 are evenly arranged on the upper surface of the baffle 1, so as to ensure that the baffle 1 can be evenly force-applied, and ensure the stability and balance during the connection between the baffle 1 and the rectangular steel.

[0082] In this embodiment, an anti-skid pad may be provided on the handle 301 to increase the friction between the handle 301 and the hand of the worker, thereby avoiding slipping and ensuring safety during the work process.

[0083] In this embodiment, the bolts 4 and nuts 5 are M12x1.25x80 standard bolts and standard nuts.

[0084] As a further description of the above embodiment, the thickness of the installation cavity is g, g≥t+Δ1, wherein t is the wall thickness of the rectangular steel, Δ1 is the distance between the upper side plate 202 of the support plate 2 and the upper wall of the rectangular steel, and Δ1=2 mm.

[0085] Of course, Δ1 is not limited to 2 mm, and can be adjusted accordingly according to actual construction conditions, such as 1≤Δ1≤2 mm.

[0086] In the rectangular steel cavity sand retaining device of the present invention, the main components such as the baffle 1, the support plate 2 and the locking member 3 are all made of steel with a thickness of t3 and a material of P690, and are processed by laser cutting and folding and pressing.

[0087] By using the rectangular steel cavity sand retaining device of the present invention, the length error of each rectangular steel cut to a fixed length is ≤3mm.

[0088] Figure 14 It is the cross-sectional view of the rectangular steel cavity, where a is the length of the rectangular steel cavity section, b is the height of the rectangular steel cavity section, t is the wall thickness of the rectangular steel, and f is the full-length weld on the inside of the rectangular steel, f≤3mm.

[0089] Example 2

[0090] like Figure 10 , 11 , 17, 18, schematic diagrams of the working status of the rectangular steel cavity sand retaining device in the rectangular steel □163×100×5 on the upper side beam 6 of the P70 flat car, or the rectangular steel □140×100×5 on the upper side beam of the C70E open car.

[0091] A rectangular steel cavity sand retaining method comprises the following steps:

[0092] S1. Classify the rectangular steel to be derusted and painted. The classification criterion is that the rectangular steel with the same height b of the cavity cross-section is classified into one category. When the height b of the rectangular steel cross-section is the same, the range of the length a of the rectangular steel cross-section is: 100mm ≤ a ≤ 180mm;

[0093] Classify the types of rectangular steel according to the length and height of the open cross-section of the rectangular steel, and classify the rectangular steel with the same height of the rectangular steel cross-section into one category. According to the width of the roller path of the pipeline equipment (≤2m, effective width ≤1.5m), determine that the number of rectangular steel passing through the shot blasting chamber for derusting at one time is 5 - 13 pieces, and the length of each piece is ≥15m.

[0094] Of course, in the specific implementation process, the baffle 1 with different heights can be selected according to the different heights of the rectangular steel cross-section, and the number of rectangular steel passing through the shot blasting chamber for derusting at one time and the length of each rectangular steel can be determined according to the width of the roller path of different pipeline equipment.

[0095] In this embodiment, there are about 35 specifications of rectangular steel that need to be shot blasted and derusted in the company's pretreatment production line. According to the 35 types of rectangular steel, according to the selection principle of the same height b of the section steel, a total of 9 types of cavity sand baffle devices are divided. The difference between the 9 types of cavity sand baffle devices lies in the different heights c of the baffle 1 and the height d of the support plate 2. Among them, the height b of the rectangular steel cross-section, the height c of the baffle 1 and the height d of the support plate 2 are all related to the wall thickness t of the rectangular steel. Specifically:

[0096] The height of the vertical end of the baffle 1 is c, c = b + 3t + Δ1, where b is the height of the rectangular steel cross-section, t is the wall thickness of the rectangular steel, and Δ1 is the distance between the upper side plate 202 of the support plate 2 and the upper wall of the rectangular steel, 1 ≤ Δ1 ≤ 2mm.

[0097] The height of the support plate 2 is d, d = b - 3t - Δ2, where b is the height of the rectangular steel cross-section, t is the wall thickness of the rectangular steel, and Δ2 is the distance between the bottom of the vertical end of the baffle 1 and the lower wall of the rectangular steel, 1 ≤ Δ1 ≤ 2mm.

[0098] In this embodiment, Δ1 = Δ2 = 2mm. Considering that there are uncontrollable external factors such as 1 - 3mm of flash, burrs, etc. on the inner sides of both ends of the cavity of the incoming rectangular steel, which are obstructive to putting the sand baffle device into the cavity, it is best to take the vertical difference between the height c of the baffle 1 and the height d of the support plate 2 as 2mm.

[0099] S2. Uniformly place the rectangular steel in the same group to be rust-proof and painted on the lifting and conveying trolley at the feeding process station of the production line. The distance e between any two adjacent rectangular steel is set, and each rectangular steel is placed neatly along the length direction on the station.

[0100] To ensure the derusting quality and painting quality of both sides of the rectangular steel, determine the distance e between two adjacent rectangular steel, e ≥ b.

[0101] S3. Place two sets of sand retaining devices at both ends of the rectangular steel to be anti-rust painted, wherein the support plate 2 is placed in the rectangular steel cavity, the upper wall of the rectangular steel is located in the installation cavity, the horizontal end of the baffle plate 1 is in contact with the upper wall of the rectangular steel, and the gap between the baffle plate 1 and the support plate 2 is equal to the thickness g of the installation cavity, g≥t+Δ1, Δ1 is the distance between the upper side plate 202 of the support plate 2 and the upper wall of the rectangular steel, 1≤Δ1≤2mm;

[0102] S4. Turn the handle 301 to tighten the bolt 4. The rotation of the bolt 4 drives the nut to move upward along the length direction of the bolt 4, thereby driving the upper side wall of the support plate 2 and the upper wall in the rectangular steel cavity to be tightly locked without gaps to achieve locking between the sand retaining device and the rectangular steel, ensuring that the cavity sand retaining device will not fall off during preheating, rust removal, painting, drying and unloading processes; in the locked state, the distance between the lower side plate 202 of the support plate 2 and the lower end plane of the inner wall of the rectangular steel cavity is h, h = g;

[0103] S5. Use the lifting and conveying trolley of the loading process on the assembly line to transport the neatly arranged rectangular steel to be derusted and painted with sand retaining devices installed on both ends to the conveyor roller for preheating, rust prevention, painting, drying and unloading processes;

[0104] S6. During the unloading and storage process, the sand retaining device is manually removed and returned to the loading process on the assembly line for fixed storage and repeated use.

[0105] In summary, the present invention can block multiple rectangular steel bars at the same time, is easy to operate, and has high working efficiency; the device has a simple structure, is easy to use, and has a low manufacturing cost; at the same time, the height of the baffle and the support plate can be interchanged according to the different rectangular steel section heights, thereby meeting different usage requirements and having a wide range of uses. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0106] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A rectangular steel cavity sand retaining device, characterized in that, It includes a baffle (1), a locking member (3) and a support plate (2); The baffle (1) is an L-shaped plate, including a horizontally integrated end and a vertically integrated end; At least two groups of the locking members (3) are arranged along the length direction of the baffle (1), and the two groups of the locking members (3) are symmetrically arranged on the upper surface of the horizontal end of the baffle (1). Each group of the locking members (3) includes a bolt (4) and a nut (5) that match each other, and the nut (5) is fixedly connected to the upper surface of the horizontal end of the baffle (1); A number of groups of the support plates (2) are uniformly arranged along the length direction of the baffle (1), and the number of groups of the support plates (2) is fixedly connected to the inner side of the vertical end of the baffle (1).

2. The rectangular steel cavity sand retaining device according to claim 1, characterized in that, The upper end of the bolt (4) is fixedly connected with a handle (301).

3. The rectangular steel cavity sand retaining device according to claim 2, wherein, A connection hole is opened at the center of the head of the bolt (4), and the lower end of the handle (301) extends into the connection hole and is fixedly welded to the bolt (4).

4. The rectangular steel cavity sand retaining device according to claim 1, characterized in that, Each group of the support plates (2) includes a bottom plate (201). The two ends of the bottom plate (201) are bent 90° in the same direction to form two side plates (202). The bottom plate (201) is welded to the inner side of the vertical end of the baffle (1). The two side plates (202) are arranged parallel to the horizontal end of the baffle (1). The distance between the bottom surface of the lower side plate (202) of the support plate (2) and the bottom of the vertical end of the baffle (1) is s, and s = t + 2 mm, where t is the wall thickness of the rectangular steel.

5. The rectangular steel cavity sand retaining device according to claim 4, characterized in that, An installation cavity (16) is formed between the lower surface of the horizontal end of the baffle (1) and the upper surface of the upper side plate (202) of the support plate (2), and the upper wall of the rectangular steel is clamped in the installation cavity (16).

6. The rectangular steel cavity sand retaining device according to claim 5, characterized in that, The thickness of the installation cavity (16) is g, and g ≥ t + Δ1, where t is the wall thickness of the rectangular steel; Δ1 is the distance between the upper side plate (202) of the support plate (2) and the upper wall of the rectangular steel, and 1 ≤ Δ1 ≤ 2 mm.

7. A method for preventing sand in a rectangular steel cavity, including the rectangular steel cavity sand prevention device according to any one of claims 1-6, characterized in that, It includes the following steps: S1. Classify the rectangular steel to be derusted and painted. The classification standard is that the rectangular steel with the same cross-sectional height b of the rectangular steel cavity is classified into one category; S2. Uniformly place the rectangular steel to be rust-proof and painted on the lifting and conveying trolley, and the distance e between any two adjacent rectangular steels is e; S3. Place two groups of sand blocking devices at both ends of the rectangular steel to be rust-proof and painted respectively. Among them, the support plate (2) is placed in the rectangular steel cavity, the horizontal end of the baffle (1) is in contact with the upper wall of the rectangular steel, and the vertical end of the baffle (1) is in contact with the end wall of the rectangular steel; S4. Rotate the handle (301) to make the upper side plate (202) of the support plate (2) tightly fit with the upper wall in the rectangular steel cavity without gaps to realize the locking between the sand blocking device and the rectangular steel; S5. Use the conveying trolley to convey the rectangular steel to be derusted and painted to the conveying roller path for preheating, rust prevention, painting, drying and blanking processes; S6. In the blanking and storage process, remove the sand blocking device and reuse it.

8. The rectangular steel cavity sand control method according to claim 7, wherein In S1, when the cross-sectional height b of the rectangular steel is the same, the range of the cross-sectional length a of the rectangular steel is: 100 mm ≤ a ≤ 180 mm.

9. The rectangular steel cavity sand control method according to claim 7, characterized in that, In S2, e ≥ b.

10. The rectangular steel cavity sand retaining method according to claim 7, characterized in that, In S4, when in the locked state, the distance h between the lower side plate (202) of the support plate (2) and the inner wall of the rectangular steel cavity is h = g.

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