Design Method of Instrument Support Structure

Abstract

The present invention provides a design method for an instrument support structure, in which an elastic member is compressed and arranged between the limiting portion and the corresponding bracket. When the distance between the first bracket and the second bracket changes, the elastic member keeps the position of the instrument unchanged by adaptively adjusting the deformation amount. During the design process, the distance change between the first bracket and the second bracket is compensated by the deformation amount of the elastic member when it is compressed, which can reduce the stress on the first bracket and the second bracket. By determining the expansion amount between the first bracket and the second bracket and the force range of the elastic member, elastic members of appropriate specifications and quantity are selected, so that the elastic members can meet the requirements even under high temperature conditions.

Description

Technical Field

[0001] The invention belongs to the field of instrument equipment, and in particular relates to a design method for an instrument support structure. Background Art

[0002] Usually, a steel tank is equipped with a variety of related instruments for monitoring the liquid level, temperature and pressure inside the tank. According to the instrument principle, some instruments need to be rigidly connected to the tank. To ensure the firmness of the connection between the instrument and the tank, the stress conditions of the embedded plate and the instrument bracket in the tank must be fully considered at the beginning of the design to ensure that they can support the weight of the instrument and meet the seismic requirements.

[0003] In actual application, the first embedded plate and the second embedded plate are fixed on the tank body, and the instrument bracket is welded to the embedded plates at room temperature so that the distance between the embedded plates is fixed. When liquid is injected into the tank body, the temperature and pressure reach the predetermined working conditions, and the tank body expands due to heat, but the instrument bracket is still at room temperature. In this case, the instrument bracket will be subjected to huge stress, resulting in the risk of complete deformation and breakage of the instrument bracket. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a design method for an instrument support structure, which can reduce the pressure generated by the change in the distance between the first bracket and the second bracket under high temperature conditions.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a design method of an instrument support structure, wherein the instrument support structure is determined, wherein the instrument support structure comprises a first bracket and a second bracket, wherein an adaptive adjustment mechanism is arranged on the first bracket and / or the second bracket, wherein the adaptive adjustment mechanism comprises a guide member and an elastic member, wherein the guide member is arranged on the corresponding bracket and can slide relative to the corresponding bracket along the distance direction between the first bracket and the second bracket, wherein one end of the guide member is used to connect the instrument, and a limiting portion is arranged on the other end of the guide member;

[0006] Wherein, the elastic member is compressed and arranged between the limiting portion and the corresponding bracket, and when the distance between the first bracket and the second bracket changes, the elastic member keeps the position of the instrument unchanged by adaptively adjusting the deformation amount;

[0007] Determine the expansion amount of the distance between the first bracket and the second bracket according to the ambient temperature of use;

[0008] Determining a first value range of the elastic force of the elastic member under normal temperature conditions;

[0009] Correcting the first value range according to the expansion amount to obtain a second value range of the elastic force of the elastic member under high temperature conditions;

[0010] The specification and quantity of the elastic member are determined so that the elastic force provided by the elastic member satisfies both the first value range and the second value range.

[0011] Optionally, it also includes:

[0012] The maximum acceleration of the instrument under preset earthquake conditions;

[0013] Correcting the first value range according to the maximum acceleration to obtain a third value range of the elastic force of the elastic member under earthquake conditions;

[0014] When selecting the specification of the elastic member, the elastic force provided by the elastic member must also satisfy the third value range.

[0015] Optionally, it also includes:

[0016] The maximum acceleration of the instrument under preset earthquake conditions;

[0017] Correcting the second value range according to the maximum acceleration to obtain a fourth value range of the elastic force of the elastic member under earthquake conditions;

[0018] When selecting the specification of the elastic member, the elastic force provided by the elastic member must also satisfy the fourth value range.

[0019] Optionally, the formula for determining the expansion amount ΔL of the distance between the first bracket and the second bracket according to the ambient temperature of use is:

[0020] △L=L0(T1-T0)α;

[0021] Wherein, L0 is the distance between the first embedded plate and the second embedded plate, T0 is the lowest working temperature of the tank body, T1 is the highest working temperature of the tank body, and α is the linear expansion coefficient.

[0022] Optionally, under normal temperature conditions, the formula for the first value range of the elastic force of the elastic member is:

[0023] F a =F1<F max ,

[0024] F b =F1<F max ;

[0025] Among them, F a is the pressure on the first bracket, F b is the pressure on the second bracket, F1 is the elastic force when the elastic member is initially compressed, and F max The maximum pressure that the first bracket and the second bracket can withstand.

[0026] Optionally, under high temperature conditions, the second value range of the elastic force of the elastic member is:

[0027] F a =F1+F2<F max ,

[0028] F b =F1+F2<F max ;

[0029] Among them, F a is the pressure on the first bracket, F b is the pressure on the second bracket, F1 is the first elastic force when the elastic member is initially compressed, F2 is the second elastic force when the elastic member is compressed due to temperature, and the second elastic force is determined according to the expansion amount, F max The maximum pressure that the first bracket and the second bracket can withstand.

[0030] Optionally, under normal temperature and earthquake conditions, the maximum acceleration of the instrument is preset to a = 10g.

[0031] The pressure generated is F c =ma;

[0032] Where a is the maximum acceleration, g is the acceleration due to gravity, m is the mass of the instrument, and F c is the pressure generated by the maximum acceleration.

[0033] Optionally, under normal temperature and earthquake conditions, the third value range formula of the elastic force of the elastic member is:

[0034] F a =F1<F max ,

[0035] F b =F c -F1<F max ;

[0036] Among them, F a is the pressure on the first bracket, F b is the pressure on the second bracket, F1 is the first elastic force when the elastic member is initially compressed, and F c is the pressure generated by the maximum acceleration, F max The maximum pressure that the first bracket and the second bracket can withstand.

[0037] Optionally, the maximum acceleration of the instrument under high temperature and earthquake conditions is:

[0038] a=10g;

[0039] The pressure generated is F c =ma;

[0040] Where a is the maximum acceleration, g is the acceleration due to gravity, m is the mass of the instrument, and F c Pressure generated by earthquakes;

[0041] Under high temperature earthquake conditions, the fourth value range formula of the elastic force of the elastic member is:

[0042] F a =F1+F2<F max ;

[0043] F b =F c -F1-F2<F max ;

[0044] Among them, F a is the pressure on the first bracket, F b is the pressure on the second bracket, F1 is the first elastic force when the elastic member is initially compressed, F2 is the second elastic force when the elastic member is compressed due to temperature, and F c is the pressure generated by the maximum acceleration, F max The maximum pressure that the first bracket and the second bracket can withstand.

[0045] As described above, the design method of the instrument support structure of the present invention has the following beneficial effects:

[0046] In the design method of the present invention, the distance change between the first bracket and the second bracket is compensated by the deformation amount of the elastic member when it is compressed, so that the stress on the first bracket and the second bracket can be reduced. By determining the expansion amount between the first bracket and the second bracket and the force range of the elastic member, elastic members of appropriate specifications and quantity are selected, so that the elastic members can meet the requirements even under high temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of the design method of the instrument support structure of the present invention;

[0048] Figure 2 It is a characteristic curve table of the disc spring in the present invention.

[0049] Part Number Description

[0050] 1-elastic member; 2-guide member; 2a-limiting portion; 3-first bracket; 4-instrument; 5-second bracket; 6-tank body. DETAILED DESCRIPTION

[0051] 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.

[0052] The present invention provides a design method for an instrument support structure:

[0053] S100, determine the instrument support structure, see Figure 1 The instrument support structure includes a first bracket 3 and a second bracket 5, which are both fixedly arranged on the tank body 6. The first bracket 3 is provided with an adaptive adjustment mechanism, which includes a guide member 2 and an elastic member 1. The guide member 2 is passed through the first bracket 3 and can slide relative to the first bracket 3 along the distance direction between the first bracket 3 and the second bracket 5. One end of the guide member 2 is used to connect the instrument 4, and the other end of the guide member 2 is provided with a limited position portion 2a;

[0054] Among them, the elastic member 1 is compressed and arranged between the limit portion 2a and the first bracket 3. When the distance between the first bracket 3 and the second bracket 5 changes, the elastic member 1 keeps the position of the instrument 4 on the tank body 6 unchanged by adaptively adjusting the deformation; the elastic member 1 includes a disc spring, a compression spring or other elastic components, which can be selected according to specific needs.

[0055] In actual implementation, the adaptive adjustment mechanism can also be arranged on the second bracket 5, the guide member 2 can be arranged on the second bracket 5, and the elastic member 1 can be arranged between the second bracket 5 and the limit portion 2a, or between the second bracket 5 and the instrument. When the distance between the first bracket 3 and the second bracket 5 changes, the elastic member 1 can maintain the position of the instrument 4 on the tank body 6 unchanged by adaptively adjusting the deformation amount.

[0056] The adaptive adjustment mechanism can also be arranged on the first bracket 3 and the second bracket 5. When the distance between the first bracket 3 and the second bracket 5 changes, the elastic member 1 keeps the position of the instrument 4 on the tank body 6 unchanged by adaptively adjusting the deformation.

[0057] S200, determining the expansion amount ΔL of the distance between the first bracket 3 and the second bracket 5 according to the ambient temperature of use;

[0058] S300, determining a first value range of the elastic force of the elastic member 1 under normal temperature conditions;

[0059] S400, correcting the first value range according to the expansion amount to obtain a second value range of the elastic force of the elastic member 1 under high temperature conditions;

[0060] S500, determining the specification and quantity of the elastic member 1 so that the elastic force provided by the elastic member 1 satisfies both the first value range and the second value range.

[0061] In the design method of the present invention, the distance change between the first bracket 3 and the second bracket 5 is compensated by the deformation amount of the elastic member 1 when it is compressed, so that the stress on the first bracket 3 and the second bracket 5 can be reduced. By determining the expansion amount between the first bracket 3 and the second bracket 5 and the force range of the elastic member 1, the elastic member 1 of appropriate specifications and quantity are selected, so that the elastic member 1 can meet the requirements even under high temperature conditions.

[0062] In some embodiments, it also includes:

[0063] S600, preset the maximum acceleration of the instrument 4 under the earthquake condition;

[0064] S700, correcting the first value range according to the maximum acceleration to obtain a third value range of the elastic force of the elastic member 1 under earthquake conditions;

[0065] S800. When selecting the specification and quantity of the elastic member 1, the elastic force provided by the elastic member 1 must also satisfy the third value range.

[0066] By determining the third value range, the first bracket 3 and the second bracket 5 can satisfy the stress conditions under normal temperature conditions and the stress conditions under earthquake conditions, so that the instrument 4 is firmly installed on the first bracket 3 and the second bracket 5.

[0067] In some embodiments, it also includes:

[0068] S900, preset maximum acceleration of instrument 4 under earthquake conditions;

[0069] S110, correcting the second value range according to the maximum acceleration to obtain a fourth value range of the elastic force of the elastic member 1 under earthquake conditions;

[0070] S120. When selecting the specification of the elastic member 1, the elastic force provided by the elastic member 1 must also satisfy a fourth value range.

[0071] By determining the fourth value range, the first bracket 3 and the second bracket 5 can satisfy the stress conditions under high temperature conditions and earthquake conditions, so that the instrument 5 is firmly installed on the first bracket 4 and the second bracket 6.

[0072] In some embodiments, in S200, the formula for determining the expansion amount ΔL of the distance between the first bracket 3 and the second bracket 5 according to the ambient temperature is:

[0073] △L=L0(T1-T0)α;

[0074] Wherein, L0 is the distance between the first embedded plate and the second embedded plate, T0 is the lowest working temperature of the tank body, T1 is the highest working temperature of the tank body, and α is the linear expansion coefficient.

[0075] Here, the spacing L0 between the first embedded plate and the second embedded plate is 415 mm, the lowest working temperature T0 of the tank is 20 °C, the highest working temperature T1 of the tank is 290 °C, and the linear expansion coefficient α is 18.4×10 -6 / ℃, that is:

[0076] △L=L0(T1-T0)α

[0077] =415×(290-20)×1.84×10 -6

[0078] =2.06mm

[0079] Of course, in actual implementation, the values ​​of the distance L0, the lowest operating temperature T0 and the highest operating temperature T1 are determined according to actual operating conditions.

[0080] In some embodiments, in S300, under normal temperature conditions, the first value range of the elastic force of the elastic member 1 is:

[0081] F a =F1<F max ,

[0082] F b =F1<F max ;

[0083] Among them, F a is the pressure on the first bracket, F b is the pressure on the second bracket, F1 is the elastic force when the elastic member is initially compressed, and F max The maximum pressure that the first bracket and the second bracket can withstand.

[0084] Here, F max The value of is 8KN, that is:

[0085] F a =F1<8KN,

[0086] F b =F1<8KN;

[0087] In the actual implementation process, max Determined according to actual working conditions.

[0088] In some embodiments, in S400, under high temperature conditions, the second value range of the elastic force of the elastic member 1 is:

[0089] F a =F1+F2<F max ;

[0090] F b =F1+F2<Fmax ;

[0091] Among them, F a is the pressure on the first bracket, F b is the pressure on the second bracket, F1 is the first elastic force when the elastic member is initially compressed, F2 is the second elastic force when the elastic member is compressed due to temperature, and the second elastic force is determined according to the expansion amount, F max The maximum pressure that the first bracket and the second bracket can withstand.

[0092] Here, F max The value of is 8KN, that is:

[0093] F a =F1+F2<8KN;

[0094] F b =F1+F2<8KN;

[0095] In the actual implementation process, F max Determined according to actual working conditions.

[0096] In some embodiments, in S500,

[0097] S501, according to the value ranges in S200, S300, and S400, the force range of the elastic member 1 can be obtained;

[0098] S502, and select the specification and quantity of the elastic member according to the force range and expansion amount of the elastic member; in the specific selection process, according to the force range of the elastic member, query the mechanical design manual to obtain the appropriate elastic member.

[0099] In some embodiments, at normal temperature and earthquake conditions,

[0100] S600, preset the maximum acceleration of the instrument a = 10g,

[0101] The pressure generated is F c =ma;

[0102] Where a is the maximum acceleration, g is the acceleration due to gravity, m is the mass of the instrument, and F c is the pressure generated by the maximum acceleration.

[0103] Here, the instrument mass m is 100 kg, that is

[0104] F c =ma=100×10×10N=10KN

[0105] In actual implementation, m is determined according to the quality of the instrument.

[0106] In some embodiments, at normal temperature and earthquake conditions,

[0107] S700, the third value range formula of the elastic force of the elastic member 1 is:

[0108] F a =F1<F max ,

[0109] F b =F c -F1<F max ;

[0110] Among them, F a is the pressure on the first bracket, F b is the pressure on the second bracket, F1 is the first elastic force when the elastic member is initially compressed, and F c is the pressure generated by the maximum acceleration, F max The maximum pressure that the first bracket and the second bracket can withstand.

[0111] Here, according to the above example, F c For 10KN, F max is 8KN, that is:

[0112] F a =F1<8KN,

[0113] F b =10KN-F1<8KN;

[0114] In the actual implementation process, F c and F max Determine based on actual situation.

[0115] In some embodiments, S800, when selecting the specification and quantity of the elastic member,

[0116] S801, according to the value ranges in S300 and S700, the force range of the elastic member 1 can be obtained;

[0117] S802, and select the specification and quantity of the elastic member according to the force range and expansion amount of the elastic member. In the specific selection process, according to the force range of the elastic member, the mechanical design manual is consulted to obtain the appropriate elastic member.

[0118] In some embodiments, under high temperature and earthquake conditions:

[0119] S900, preset the maximum acceleration of the instrument to be a=10g;

[0120] The pressure generated is F c =ma;

[0121] Where a is the maximum acceleration, g is the acceleration due to gravity, m is the mass of the instrument, and F c Pressure generated by earthquakes;

[0122] Here, the instrument mass m is 100 kg, that is

[0123] F c =ma=100×10×10N=10KN

[0124] In actual implementation, m is determined according to the quality of the instrument.

[0125] S110. Under high temperature and earthquake conditions, the fourth value range formula of the elastic force of the elastic member 1 is:

[0126] F a =F1+F2<F max ;

[0127] F b =F c -F1-F2<F max ;

[0128] Among them, F a is the pressure on the first bracket, F b is the pressure on the second bracket, F1 is the first elastic force when the elastic member is initially compressed, F2 is the second elastic force when the elastic member is compressed due to temperature, and F c is the pressure generated by the maximum acceleration, F max The maximum pressure that the first bracket and the second bracket can withstand.

[0129] Here, according to the above example, F c For 10KN, F max is 8KN, that is:

[0130] F a =F1+F2<8KN;

[0131] F b =10KN-F1-F2<8KN;

[0132] In the actual implementation process, F c and F max Determine based on actual situation.

[0133] In some embodiments, S120, when selecting the specification of the elastic member 1,

[0134] S121. According to the value ranges in S200, S400 and S110, the force range of the elastic member can be obtained;

[0135] S122, and select the specification and quantity of the elastic part according to the force range and expansion amount of the elastic part. In the specific selection process, according to the force range of the elastic part, consult the mechanical design manual to obtain the appropriate elastic part.

[0136] According to the above example, in actual use, in order to make the elastic member work in the bottom load range, two sets of adaptive adjustment mechanisms are selected. Of course, the adaptive adjustment mechanism can also be one or more sets, which can be selected according to specific needs; in order to make the structure more compact, the elastic member here is selected to be composed of 14 A25 standard disc springs stacked together. According to the standard calculation formula of disc springs, the characteristic curve of disc springs is calculated. See Figure 2 .

[0137] According to the calculation results, the disc spring working parameters can be determined:

[0138] The initial compression of the disc spring is S = 2.828mm, and the pressure on the disc spring is F1 = 2 × 1.501 = 3.002kN;

[0139] Under high temperature conditions, the distance expansion △L between the first bracket 3 and the second bracket 5 is 2.06mm, the total compression of the disc spring is S+2.06=4.888mm, and the elastic force of the disc spring is F1+F2=2×2.507=5.014kN;

[0140] Calculate empirically to meet the above working conditions.

[0141] The instrument support structure of the present invention can simultaneously meet the requirements of the first bracket and the second bracket to overcome the expansion and earthquake resistance of the tank under different working conditions. When the bracket is actually used, the appropriate elastic preload can be calculated according to the expansion of the tank, the force of the bracket, and the earthquake intensity, and finally the type, specification, and quantity of the elastic parts can be matched to achieve accurate force matching.

[0142] 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 design method for an instrument support structure, characterized in that: include: Determine an instrument support structure, the instrument support structure includes a first bracket and a second bracket, an adaptive adjustment mechanism is provided on the first bracket and / or the second bracket, the adaptive adjustment mechanism includes a guide member and an elastic member, the guide member is passed through the corresponding bracket and can slide relative to the corresponding bracket along the distance direction between the first bracket and the second bracket, one end of the guide member is used to connect the instrument, and the other end of the guide member is provided with a limit portion; Wherein, the elastic member is compressed and arranged between the limiting portion and the corresponding bracket, and when the distance between the first bracket and the second bracket changes, the elastic member keeps the position of the instrument unchanged by adaptively adjusting the deformation amount; Determine the expansion amount of the distance between the first bracket and the second bracket according to the ambient temperature of use; Determining a first value range of the elastic force of the elastic member under normal temperature conditions; Correcting the first value range according to the expansion amount to obtain a second value range of the elastic force of the elastic member under high temperature conditions; Determine the specification and quantity of the elastic member so that the elastic force provided by the elastic member satisfies both the first value range and the second value range; A first embedded plate and a second embedded plate are arranged on the tested tank body, the first bracket is welded and arranged on the first embedded plate, and the second bracket is welded on the second embedded plate; The formula for determining the expansion amount △L of the distance between the first bracket and the second bracket according to the ambient temperature is: △L=L0(T1-T0)α; Wherein, L0 is the distance between the first embedded plate and the second embedded plate, T0 is the lowest working temperature of the tank, T1 is the highest working temperature of the tank, and α is the linear expansion coefficient; Under normal temperature conditions, the formula for the first value range of the elastic force of the elastic member is: F a =F1<F max , F b =F1<F max ; Among them, F a is the pressure on the first bracket, F b is the pressure on the second bracket, F1 is the elastic force when the elastic member is initially compressed, and F max The maximum pressure that the first bracket and the second bracket can bear; Under high temperature conditions, the second value range of the elastic force of the elastic member is as follows: F a =F1+F2<F max , F b =F1+F2<F max ; Among them, F a is the pressure on the first bracket, F b is the pressure on the second bracket, F1 is the first elastic force when the elastic member is initially compressed, F2 is the second elastic force when the elastic member is compressed due to temperature, and the second elastic force is determined according to the expansion amount, F max The maximum pressure that the first bracket and the second bracket can withstand.

2. The design method of the instrument support structure according to claim 1, characterized in that: Also includes: The maximum acceleration of the instrument under preset earthquake conditions; Correcting the first value range according to the maximum acceleration to obtain a third value range of the elastic force of the elastic member under earthquake conditions; When selecting the specification of the elastic member, the elastic force provided by the elastic member must also satisfy the third value range.

3. The design method of the instrument support structure according to claim 1, characterized in that: Also includes: The maximum acceleration of the instrument under preset earthquake conditions; Correcting the second value range according to the maximum acceleration to obtain a fourth value range of the elastic force of the elastic member under earthquake conditions; When selecting the specification of the elastic member, the elastic force provided by the elastic member must also satisfy the fourth value range.

4. The design method of the instrument support structure according to claim 2 is characterized in that: Under normal temperature and earthquake conditions, the maximum acceleration of the instrument is preset to a = 10g. The pressure generated is F c =ma; Where a is the maximum acceleration, g is the acceleration due to gravity, m is the mass of the instrument, and F c is the pressure generated by the maximum acceleration.

5. The design method of the instrument support structure according to claim 4 is characterized in that: Under normal temperature and earthquake conditions, the third value range formula of the elastic force of the elastic member is: F a =F1<F max , F b =F c -F1<F max ; Among them, F a is the pressure on the first bracket, F b is the pressure on the second bracket, F1 is the first elastic force when the elastic member is initially compressed, and F c is the pressure generated by the maximum acceleration, F max The maximum pressure that the first bracket and the second bracket can withstand.

6. The design method of the instrument support structure according to claim 3, characterized in that: The maximum acceleration of the instrument under high temperature and earthquake conditions is: a=10g; The pressure generated is F c =ma; Where a is the maximum acceleration, g is the acceleration due to gravity, m is the mass of the instrument, and F c Pressure generated by earthquakes; Under high temperature earthquake conditions, the fourth value range formula of the elastic force of the elastic member is: F a =F1+F2<F max ; F b =F c -F1-F2<F max ; Among them, F a is the pressure on the first bracket, F b is the pressure on the second bracket, F1 is the first elastic force when the elastic member is initially compressed, F2 is the second elastic force when the elastic member is compressed due to temperature, and F c is the pressure generated by the maximum acceleration, F max The maximum pressure that the first bracket and the second bracket can withstand.

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