Design method of anti-explosion delivery window applied to material conveying of anti-explosion chamber

Abstract

The invention belongs to the technical field of anti-explosion protection, and discloses a design method of an anti-explosion delivery window applied to material transmission of an anti-explosion room, which comprises the following steps: calculating the thickness H of an anti-explosion window plate which is not penetrated by explosion fragments / fragments; according to an equivalent static load value calculation formula, calculating an equivalent static load qe generated by the anti-explosion transfer window under the action of air shock waves; converting the equivalent static load qe into concentrated force, and substituting the concentrated force into a shear strength calculation formula for checking calculation to obtain the thickness Hc of the anti-explosion window plate capable of bearing the equivalent static load and resisting explosion fragment / fragment penetration; according to the equivalent static load qe, standard values qa and qb of the rebound load R and the acting force per unit length of the pressing frame are calculated; the resilience force pressure value F borne by the pressing frame is calculated; and calculating the thickness Hk of the pressing frame according to the anti-shearing strength of the material of the pressing frame. According to the anti-explosion delivery window, it can be guaranteed that the anti-explosion window plate cannot be penetrated by explosion fragments or fragments when accidental explosion happens; and the flying-off phenomenon cannot occur under the action of the springback effect.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion protection, and particularly to a design method of an explosion-proof transfer window applied to the material transfer in an explosion-proof chamber. Background Art

[0002] In recent years, the production safety of combustible and explosive dangerous goods has been highly emphasized. Through the analysis of explosion accidents in the dangerous goods production industry, it is found that the expansion of the explosion effect range inside the explosion-proof chamber is often caused by the unreasonable design of the explosion-proof transfer window. With the in-depth research on the explosion-proof transfer window, the damage process of the explosion-proof transfer window in the previous production line explosion accidents has been simulated by using numerical simulation software, and a more scientific and in-depth understanding of the damage effect of the explosion-proof transfer window has been obtained. That is: in addition to bearing the positive pressure of the explosion shock wave, the explosion-proof transfer window will also rebound during the dynamic response (high-frequency superimposed vibration) of the window panel. The rebounding effect will generate a thrust on the local part of the window frame and the restraint member (compression frame) in contact with the elastic window panel, form a bending moment on the vertical flange of the L-shaped cross-section compression frame, cause the bending deformation of the explosion-proof transfer window restraint member, resulting in the explosion-proof window panel losing restraint and flying off under the action of accidental explosion loads (the window panel gets rid of the restraint and flies out under the action of the explosion shock). In addition, the high-speed fragments / debris generated by accidental explosions inside the explosion-proof chamber will penetrate (i.e., penetrate through) the explosion-proof window panel, rendering the protective effect of the explosion-proof transfer window ineffective.

[0003] Therefore, how to reasonably design the structure and size of the explosion-proof transfer window is particularly important for improving the protective effect of the explosion-proof transfer window. Summary of the Invention

[0004] To solve the above problems, the present application provides a design method of an explosion-proof transfer window applied to the material transfer in an explosion-proof chamber, including the following steps.

[0005] S1: Calculate the thickness H of the explosion-proof window panel that is not penetrated by explosion fragments / debris. The formula is as follows:

[0006]

[0007] In the formula, A is the maximum windward area of the fragment (m 2 ); m f is the mass of the fragment (kg); V s is the target hitting speed of the fragment (m / s); C is the static resistance constant of the window panel material made of steel.

[0008] S2: Substitute the distance from the explosion center to the centroid of the explosion-proof transfer window, the designed explosive charge of the explosion-proof chamber, and the size of the explosion-proof window panel into the equivalent static load value calculation formula to calculate the equivalent static load q generated on the explosion-proof transfer window under the action of the air shock wave e ;

[0009] S3: Convert the equivalent static load q according to the area of the window panel e into a concentrated force and substitute it into the anti-shear strength calculation formula to check the thickness H of the explosion-proof window panel, and obtain the thickness H of the explosion-proof window panel that can withstand both the equivalent static load and resist the penetration of explosion fragments c ;

[0010] S4: Calculate the rebound load R generated after the positive pressure unloading of the explosion-proof transfer window according to the equivalent static load q, and calculate the standard values q e of the acting force per unit length of the upper and lower clamping frames and the side clamping frames a and q b ;

[0011] S5: Calculate the value F of the resilience pressure borne by the clamping frame;

[0012] S6: Calculate the thickness H of the clamping frame according to the anti-shear strength of the clamping frame material k .

[0013] Further, in the step S1, the value of the static resistance constant C of the steel window panel material is obtained by the following method:

[0014] Conduct a verification test on the penetration of metal fragments into a steel target plate using a smoothbore gun. The fragments are spherical and cubic tungsten alloy metal fragments with a mass of 3-16 g, and the target plates are Q235 and Q345 steel plates with a thickness of 20-40 mm; the maximum kinetic energy of the fragment loading is 15 KJ, and the maximum initial velocity is 2150 ± 15 m / s. A total of 146 penetration tests are carried out;

[0015] Substitute the test data into the Christman-gehring formula, the dimensional formula, and the De Marre formula respectively to form a regular curve;

[0016] Compare the regular curve with the test data curve for conformity, and determine that the expression formula is the dimensional formula;

[0017] Then substitute the test data into the dimensional formula to solve for the value of C.

[0018] Further, in the step S2, the equivalent static load q e is calculated using the following formula:

[0019] When t ≤ T / 2: q e = i m ωε;

[0020] When t > T / 2:

[0021] Where: t is the equivalent time (s) when the positive pressure of the air shock wave acts on the explosion-proof surface of the window panel; T is the natural vibration period (s) of the explosion-proof transfer window; i mis the average impulse (kg-s / m) of the explosion shock wave acting on the explosion-proof window panel in the explosion-proof chamber 2 ); ω is the natural circular frequency (1 / s) of the explosion-proof window panel; ε is the damping coefficient.

[0022] Furthermore, in the step S4, the rebound load R is calculated by the following formula:

[0023] R = mq e

[0024] where: m is the rebound coefficient, taking 0.7;

[0025] The standard values q a , q b of the force per unit length of the upper and lower clamping frames and the side clamping frames are calculated by the formula:

[0026] q a = Rγ a a

[0027] q b = Rγ b b

[0028] where: γ a , γ b are the rebound force distribution coefficients along the upper and lower clamping frames and the side clamping frames respectively; a and b are the explosion-proof width and height (m) of the explosion-proof window panel.

[0029] Furthermore, in the step S5, the formula for calculating the value F of the rebound force borne by the clamping frame is:

[0030] F = q × a × b

[0031] When calculating the upper and lower clamping frames, q = 0.5q a , when calculating the side clamping frames, when there are side clamping frames on both sides of the explosion-proof transfer window, q = 0.5q b , when there is only one side clamping frame on the explosion-proof transfer window, q = qb.

[0032] Furthermore, in the step S6, the formula for calculating the thickness H k of the clamping frame is:

[0033]

[0034] where: h is the width (mm) of the clamping frame, and f v is the design value of the shear strength of the clamping frame material (N / mm 2 ).

[0035] Further, the explosion-proof transfer window includes an inner cushion frame provided at the inner and outer edges of the explosion-proof window opening. On the side of the inner cushion frame away from the wall, there are an upper pressing frame, side pressing frames, and a lower pressing frame. An L-shaped notch is formed on the inner side of the lower plate edge of the upper pressing frame. The L-shaped notch and the inner cushion frame form a first limiting groove with a downward opening. The lower pressing frame includes a lower pressing plate. A cushion block is provided between the lower pressing plate and the inner cushion frame. An upward-opening second limiting groove is formed among the upper side of the lower pressing plate, the cushion block, and the inner cushion frame. The widths of the first limiting groove and the second limiting groove are the same, and an explosion-proof window plate is slidably arranged in them together. It also includes a driving cylinder provided on the wall for driving the sliding of the explosion-proof window plate.

[0036] Further, a plurality of the cushion blocks are provided, arranged at intervals along the length direction of the lower pressing frame. A plurality of guide wheel shafts fixed on the inner cushion frame are provided on both sides of the cushion block. The length direction of the guide wheel shafts is perpendicular to the plate surface of the lower pressing plate, and window plate guide wheels are rotatably arranged on them.

[0037] Further, the window plate guide wheels are integrally in the shape of a round cake with a hole in the middle, and the inner hole diameter is 1 mm larger than the diameter of the guide wheel shaft.

[0038] Further, through holes are formed in the inner cushion frame, the upper pressing frame, the side pressing frames, and the lower pressing frame. Through bolts pass through the through holes to fixedly connect the upper pressing frame and the inner cushion frame, the side pressing frames and the inner cushion frame, and the lower pressing frame and the inner cushion frame on both sides of the explosion-proof window opening.

[0039] In summary, the present invention has the following beneficial effects: In this application, first calculate the thickness of the explosion-proof window plate that will not be penetrated by explosion fragments, and then obtain the thickness of the explosion-proof window plate that can withstand the equivalent static load and resist the penetration of explosion fragments through the calculation and verification of the equivalent static load value calculation formula and the anti-shear strength calculation formula, ensuring that the explosion-proof window plate will not be penetrated by explosion fragments when an accidental explosion occurs in the explosion-proof compartment; then calculate the thickness of the pressing frame according to the rebound load, the rebound force pressure value, and the material of the pressing frame, ensuring that the explosion-proof window plate will not fly off under the action of the rebound effect, further guaranteeing production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic diagram of the overall structure of the explosion-proof transfer window in an embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of the structure of the explosion-proof transfer window in an embodiment of the present invention after hiding the lower pressing frame.

[0042] In the figure: 1. inner gasket frame; 2. upper clamping frame; 21. first limiting groove; 3. side clamping frame; 4. lower clamping frame; 41. lower clamping plate; 42. gasket; 43. second limiting groove; 44. guide wheel shaft; 45. window panel guide wheel; 5. explosion-proof window panel; 6. driving cylinder; 7. tension bolts. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0044] As shown in the figure, the embodiment of the present application discloses a method for designing an explosion-proof transfer window for material transmission in an explosion-proof compartment, comprising the following steps:

[0045] S1: Calculate the thickness H of the explosion-proof window panel that is not penetrated by explosion fragments / debris. The formula is as follows:

[0046]

[0047] Where A is the maximum windward area of ​​the fragment (m 2 );m f is the mass of the fragment (kg); V s is the impact velocity of fragments (m / s); C is the static resistance constant of the steel window panel material.

[0048] The value of the static resistance constant C of the steel window panel material is determined by the following method:

[0049] A smoothbore gun was used to conduct a metal fragmentation penetration test on a steel target plate. The fragments used were spherical and cubic 3-16g tungsten alloy metal fragments, and the target plate was 20-40mm thick Q235 and Q345 steel plates. The maximum kinetic energy of the fragments was 15KJ, the maximum initial velocity was 2150±15m / s, and a total of 146 penetration tests were conducted.

[0050] Substitute the test data into the Christman-gehring formula, dimensional formula, and De Marre formula to form a regular curve;

[0051] Compare the regular curve with the test data curve to determine whether the expression formula is a dimensional formula;

[0052] Then substitute the test data into the dimension formula to solve for the value of C. In this embodiment, C=5.45 GPa.

[0053] S2: Substitute the distance from the explosion center to the centroid of the blast-resistant transfer window, the designed charge of the blast-resistant compartment, and the dimensions of the blast-resistant window panel 5 into the calculation formula for the equivalent static load value, and calculate the equivalent static load q generated on the blast-resistant transfer window under the action of the air shock wave. e .

[0054] The equivalent static load q e is calculated using the following formula:

[0055] When t ≤ T / 2: q e = i m ωε;

[0056] When t > T / 2:

[0057] In the formula: t is the equivalent time (s) when the positive pressure of the air shock wave acts on the blast-facing surface of the blast-resistant window panel; T is the natural vibration period (s) of the blast-resistant transfer window; i m is the average impulse (kg-s / m 2 ) acting on the blast-resistant window panel 5 by the internal explosion shock wave in the blast-resistant compartment; ω is the natural vibration circular frequency (1 / s) of the blast-resistant window panel 5; ε is the damping effect coefficient.

[0058] S3: Substitute the equivalent static load q e into the shear strength calculation formula to check the thickness H of the blast-resistant window panel, and obtain the thickness H of the blast-resistant window panel that can not only withstand the equivalent static load but also resist the penetration of explosion fragments. c .

[0059] S4: Calculate the rebound load R generated after the positive pressure of the blast-resistant transfer window is unloaded according to the equivalent static load q e , and calculate the standard values q a , q b .

[0060] The rebound load R is calculated using the following formula:

[0061] R = mq e

[0062] In the formula: m is the rebound coefficient.

[0063] The value of the rebound coefficient m is determined by the following method:

[0064] Use the Autodyn simulation calculation software to establish a rebound test model of the blast-resistant transfer window based on the fluid-structure interaction algorithm, calculate the shock wave pressure time history curve based on the Brode explosion shock wave formula, and load it onto the blast-resistant transfer window model according to the three-dimensional mapping calculation method to obtain the dynamic response characteristic parameters of the blast-resistant transfer window;

[0065] Design an anti-explosion transfer window resilience test device, build a resilience test platform in the field, and use a 20 - 280 Kg TNT charge as the explosion source (generating shock waves) to conduct in-field static explosion tests. The test thickness of the anti-explosion transfer window panel is 15 mm - 38 mm, the equivalent static load range borne by the window panel is about 1.8 - 4.2 Mpa, and the total number of explosion tests is 24 times;

[0066] Compare the simulation calculation results with the measured parameters of the explosion test; guided by the measured data of the explosion test, correct the significantly deviated working condition parameters in the simulation model by supplementing material mechanical property tests or adjusting model mesh division, etc.; obtain a simulation model with a high credibility for amplifying "extrapolation" (the error between the simulation and test results ≤ 8%), and conduct simulation tests under different working conditions based on this. The ratio (resilience coefficient) m of the resilience force borne by the anti-explosion window panel to the equivalent static load borne by the window panel is 0.7.

[0067] The standard values q a 、q b of the force per unit length of the upper and lower clamping frames 2, 4 and the side clamping frame 3 are calculated as follows:

[0068] q a =Rγ a a

[0069] q b =Rγ b b

[0070] Where: γ a 、γ b are the resilience force distribution coefficients along the upper and lower clamping frames 2, 4 and the side clamping frame 3 respectively, and are taken according to the following table; a and b are the anti-explosion width and height (m) of the anti-explosion window panel 5 respectively.

[0071] Table 1 Resilience force distribution coefficient

[0072] a / b 0.428 0.44 0.50 0.6 0.67 0.7 0.8 0.9 1.0 <![CDATA[γ a > 0.42 0.44 0.44 0.46 0.46 0.46 0.48 0.50 0.50 <![CDATA[γ b > 0.58 0.56 0.56 0.54 0.54 0.54 0.52 0.50 0.50

[0073] S5: Calculate the resilience force pressure value F borne by the clamping frame; the calculation formula is:

[0074] F = q × a × b

[0075] When calculating the upper and lower clamping frames 2, 4, q = 0.5q a , when calculating the side clamping frame 3, when there are side clamping frames 3 on both sides of the anti-explosion transfer window, q = 0.5q b , when there is only one side clamping frame 3 on the anti-explosion transfer window, q = q b .

[0076] S6: Calculate the thickness H of the clamping frame according to the shear strength of the clamping frame material k。The calculation formula is as follows:

[0077]

[0078] In the formula: h is the width of the pressing frame (mm), and f v is the design value of the shear strength of the pressing frame material (N / mm 2 ).

[0079] The thickness of the blast-resistant window panel 5 and the pressing frame is designed by the above method, so that the blast-resistant window panel 5 will not be penetrated by blast fragments / shrapnel in the case of an explosion in the blast-resistant compartment, nor will it fly off under the action of the rebound effect and break free from the restraint of the pressing frame.

[0080] Specifically, the blast-resistant transfer window includes an inner cushion frame 1, an upper pressing frame 2, a side pressing frame 3, a lower pressing frame 4, a blast-resistant window panel 5 and a driving cylinder 6 arranged at the inner and outer edges of the blast-resistant window opening. The upper pressing frame 2, the side pressing frame 3 and the lower pressing frame 4 are arranged on the side of the inner cushion frame 1 away from the wall, and are used to install the blast-resistant window panel 5 and limit the sliding direction of the blast-resistant window panel 5. The cylinder body part of the driving cylinder 6 is arranged on the wall, and the end of the piston rod is connected to the blast-resistant window panel 5, and is used to drive the blast-resistant window panel 5 to slide.

[0081] An L-shaped notch is opened on the inner side of the lower plate edge of the upper pressing frame 2. The L-shaped notch and the inner cushion frame 1 form a first limiting groove 21 with an opening downward. The lower pressing frame 4 includes a lower pressing plate 41. A cushion block 42 is arranged between the lower pressing plate 41 and the inner cushion frame 1. The upper edge of the cushion block 42 is lower than the upper edge of the lower pressing plate 41, so as to form a second limiting groove 43 with an opening upward between the lower pressing plate 41, the cushion block 42 and the inner cushion frame 1. The blast-resistant window panel 5 is slidably arranged in the first limiting groove 21 and the second limiting groove 43 together. When setting, the groove widths of the first limiting groove 21 and the second limiting groove 43 are the same and are slightly larger than the thickness of the blast-resistant window panel 5, so that the blast-resistant window panel 5 can slide horizontally in the first limiting groove 21 and the second limiting groove 43; the depths of the first limiting groove 21 and the second limiting groove 43 are increased by 2 mm on the basis of the thickness of the blast-resistant window panel 5, so as to limit the window panel from falling off due to impact deformation under the action of the shock wave load.

[0082] A number of spacer blocks 42 are provided and arranged at intervals along the length direction of the lower pressing frame 4. A number of guide wheel shafts 44 fixed to the inner cushion frame 1 are provided on both sides of the spacer block 42. The guide wheel shafts 44 are made of conventional steel studs, with threads provided at the ends, and the length direction thereof is perpendicular to the plate surface of the lower pressing plate 41. During installation, they are installed on the inner cushion frame 1 through the threads at the ends. A window plate guide wheel 45 is rotatably arranged on the guide wheel shaft 44. The window plate guide wheel 45 is integrally in the shape of a round cake with a hole in the middle, and the inner hole diameter thereof is 1 mm larger than the diameter of the guide wheel shaft 44, so that the window plate guide wheel 45 can freely rotate on the guide wheel shaft 44. The lower plate edge of the blast-resistant window plate 5 is located on the window plate guide wheel 45, and the resistance during the sliding of the blast-resistant window plate 5 can be effectively reduced through the window plate guide wheel 45.

[0083] Through holes are provided on the inner cushion frame 1, the upper pressing frame 2, the side pressing frame 3 and the lower pressing frame 4, and they are connected by tie bolts 7. Specifically, the diameter of the through holes is 19 - 20 mm, and the tie bolts 7 are high-strength bolts with a diameter of not less than 18 mm. During use, the tie bolts 7 pass through the upper pressing frame 2 and the inner cushion frame 1 on both sides inside and outside the blast-resistant window opening to fixedly connect the upper pressing frames 2 on both sides with the inner cushion frame 1, the tie bolts 7 pass through the side pressing frame 3 and the inner cushion frame 1 on both sides inside and outside the blast-resistant window opening to fixedly connect the side pressing frames 3 on both sides with the inner cushion frame 1, and the tie bolts 7 pass through the lower pressing frame 4 and the inner cushion frame 1 on both sides inside and outside the blast-resistant window opening for fixed connection.

[0084] The inner cushion frame 1, the upper pressing frame 2, the side pressing frame 3, the lower pressing plate 41 and the spacer blocks 42 are all steel plates made of Q235 or Q345 or Q355 steel, with good welding performance and plasticity. Using the above design method of this embodiment for design, the thickness of the inner cushion frame 1 is obtained as 10 mm, and the thicknesses of the upper pressing frame 2, the side pressing frame 3 and the lower pressing frame 4 are 20 mm.

[0085] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. An anti-explosion transfer window design method applied to the material transfer in an anti-explosion chamber, characterized in that including the following steps, S1: Calculate the thickness H of the blast-resistant window panel that is not penetrated by blast fragments / debris. The formula is as follows: Where A is the maximum windward area of the fragment (m 2 ); m f is the mass of the fragment (kg); V s is the impact velocity of the fragment on the target (m / s); C is the static resistance constant of the steel window plate material; S2: Substitute the distance from the explosion center to the centroid of the explosion-proof transfer window, the designed explosive charge of the explosion-proof compartment, and the size of the explosion-proof window panel into the calculation formula for the equivalent static load value, and calculate the equivalent static load q generated on the explosion-proof transfer window under the action of the air shock wave e ; S3: Convert the equivalent static load q according to the area of the window panel e into a concentrated force and substitute it into the anti-shear strength calculation formula to check the thickness H of the explosion-proof window panel, and obtain the thickness H of the explosion-proof window panel that can withstand the equivalent static load and resist the penetration of explosion fragments c ; S4: According to the equivalent static load q e Calculate the rebound load R generated after the positive pressure unloading of the explosion-proof transfer window, and calculate the standard values q a and q b ; S5: Calculate the resilience pressure value F borne by the compression frame; S6: Calculate the thickness H of the pressing frame according to the shear strength of the pressing frame material k .

2. The design method of an explosion-proof transfer window applied to the material transfer in an explosion-proof chamber according to claim 1, wherein: In the step S1, the value of the static resistance constant C of the steel window panel material is obtained by the following method: Use a smoothbore gun to conduct a verification test on the penetration of steel target plates by metal fragments. The fragments are spherical and cubic tungsten alloy metal fragments with a mass of 3-16 g, and the target plates are Q235 and Q345 steel plates with a thickness of 20-40 mm. The maximum kinetic energy of the fragment loading is 15 KJ, and the maximum initial velocity is 2150±15 m / s. A total of 146 penetration tests are carried out; Substitute the test data into the Christman-gehring formula, the dimensional formula, and the De Marre formula respectively to form a regular curve; Compare the consistency of the regular curve with the test data curve to determine that the expression formula is the dimensional formula; Then substitute the test data into the dimensional formula to solve the value of C.

3. The design method of an explosion-proof transfer window applied to material transfer in an explosion-proof chamber according to claim 1, wherein: In the step S2, the equivalent static load q e is calculated by using the following formula: When t ≤ T / 2: q e = i m ωε; When t > T / 2: Where: t is the equivalent time (s) when the positive pressure of the air shock wave acts on the explosion - facing surface of the explosion - proof window panel; T is the natural vibration period (s) of the explosion - proof transfer window; i m is the average impulse (kg - s / m 2 ) acting on the explosion - proof window panel by the explosion shock wave in the explosion - proof chamber; ω is the natural vibration circular frequency (1 / s) of the explosion - proof window panel; ε is the damping coefficient.

4. A design method of an explosion-proof transfer window applied to material transfer in an explosion-proof chamber, characterized in that: In the step S4, the rebound load R is calculated using the following formula: R = mq e Where: m is the rebound coefficient, taking 0.7; The standard values q a and q b for the force per unit length of the upper and lower pressing frames and the side pressing frames are calculated as follows: q a = Rγ a a q b = Rγ b b where: γ a and γ b are the rebound force distribution coefficients along the upper and lower pressing frames and the side pressing frames respectively; a and b are the explosion-proof width and height of the explosion-proof window panel (m).

5. A design method of an explosion-proof transfer window applied to material transfer in an explosion-proof chamber, characterized in that: In the step S5, the calculation formula for the resilience pressure value F borne by the compression frame is: F = q×a×b When calculating the upper and lower clamping frames, q = 0.5q a , when calculating the side clamping frames, when there are side clamping frames on both sides of the blast-resistant transfer window, q = 0.5q b , when there is only one side clamping frame on the blast-resistant transfer window, q = qb.

6. A design method for an explosion-proof transfer window applied to material transfer in an explosion-proof chamber, characterized in that: In the step S6, the thickness H of the pressing frame k is calculated by the formula: Where: h is the width (mm) of the pressing frame, and f v is the design shear strength value of the pressing frame material (N / mm 2 ).

7. A design method of an explosion-proof transfer window applied to material transfer in an explosion-proof chamber, characterized in that: The blast-resistant transfer window includes an inner cushion frame provided at the inner and outer edges of the blast-resistant window opening. On the side of the inner cushion frame away from the wall, there are an upper compression frame, a side compression frame, and a lower compression frame. An L-shaped notch is opened on the inner side of the lower plate edge of the upper compression frame. The L-shaped notch and the inner cushion frame form a first limiting groove with a downward opening. The lower compression frame includes a lower compression plate. A spacer block is provided between the lower compression plate and the inner cushion frame. An upward-opening second limiting groove is formed among the upper side of the lower compression plate, the spacer block, and the inner cushion frame. The widths of the first limiting groove and the second limiting groove are the same, and a blast-resistant window panel is slidably arranged therein. It also includes a driving cylinder provided on the wall for driving the sliding of the blast-resistant window panel.

8. A design method of an explosion-proof transfer window applied to material transfer in an explosion-proof chamber according to claim 1, characterized in that: A plurality of the spacer blocks are provided, arranged at intervals along the length direction of the lower compression frame. A plurality of guide wheel shafts fixed on the inner cushion frame are provided on both sides of the spacer block. The length direction of the guide wheel shafts is perpendicular to the plate surface of the lower compression plate, and window panel guide wheels are rotatably arranged thereon.

9. A design method for an explosion-proof transfer window applied to material transfer in an explosion-proof chamber, characterized in that: The window panel guide wheel is integrally in the shape of a round cake with a hole in the middle, and the inner hole diameter is 1 mm larger than the diameter of the guide wheel shaft.

10. A design method of an explosion-proof transfer window applied to the material transfer of an explosion-proof chamber, characterized in that: Through holes are opened on the inner cushion frame, the upper compression frame, the side compression frame, and the lower compression frame. Through bolts pass through the through holes to fixedly connect the upper compression frame and the inner cushion frame, the side compression frame and the inner cushion frame, and the lower compression frame and the inner cushion frame on both sides of the blast-resistant window opening.

Images