Strength calculation method for brake axle structure of logging winch

Abstract

The invention relates to a strength calculation method for a brake axle structure of a logging winch, and the brake axle structure comprises a brake axle which is sequentially provided with a driving lug plate, a first bearing seat, a first brake lug plate, a second brake lug plate and a second bearing seat. The method comprises the following steps: calculating the total tension of a brake lug plate and the tension of a driving lug plate according to cable tension; according to the total tensile force of the brake lug plate and the tensile force of the driving lug plate, obtaining a strength result of a brake axle structure by utilizing finite element software, and calculating to obtain shear stress borne by the brake axle; according to the simulation result of the brake axle structure, whether the shear stress and the simulation result meet corresponding allowable requirements or not is judged so as to determine whether to adjust the brake axle structure or not. According to the method, whether the simulation result of the brake axle structure meets the allowable requirements of the corresponding parts or not is judged, so that whether the brake axle structure is adjusted or not can be determined according to the judgment result, the structure safety is ensured, meanwhile, overall replacement of a logging winch is avoided, and the cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of well logging equipment, and in particular relates to a strength calculation method for a brake shaft structure of a well logging drawworks. Background Art

[0002] The logging winch is an important surface equipment for logging. Its main work is to lift or lower the logging instrument through the power unit. The belt brake structure of the logging winch is used to fix the logging instrument in a certain position through the cable to achieve braking during the lifting or lowering of the logging instrument.

[0003] Cables are consumable parts. After long-term use, the communication effect will deteriorate or even break. Therefore, cables need to be replaced in time. With the development of the cable industry, the tension on cables has gradually increased. Therefore, the tension of the replaced cables will increase compared to the original cables. The increase in cable tension helps to smoothly pull the downhole instruments to the ground. However, after the cable tension increases, the belt brake structure of the logging winch may not match the cable with increased tension after replacement. If a matching logging winch is replaced, it will cost a lot. Therefore, it is necessary to calculate the strength of the belt brake structure of the logging winch, which is mainly reflected in the strength calculation of the brake shaft structure composed of a drive lug, two brake lugs, two bearing seats and a brake shaft, so as to replace certain parts that do not meet the strength requirements and achieve a belt brake structure that meets the requirements at a relatively low cost. Summary of the invention

[0004] In order to solve all or part of the above problems, the present invention aims to provide a strength calculation method for the brake shaft structure of a logging drawworks.

[0005] According to one aspect of the present invention, a strength calculation method for a brake shaft structure of a logging drawworks is provided, wherein the brake shaft structure comprises a brake shaft, and a driving lug plate, a first bearing seat, a first brake lug plate, a second brake lug plate, and a second bearing seat are sequentially arranged on the brake shaft, and the method comprises:

[0006] The total tension of the brake lug and the tension of the driving lug are calculated based on the cable tension;

[0007] According to the total tension of the brake lug and the tension of the driving lug, the simulation result of the brake shaft structure is obtained by using finite element software, and the simulation result of the brake shaft structure includes: the normal stress of the brake shaft, the reaction force of the first bearing seat, the reaction force of the second bearing seat, the deflection angle of the brake shaft at the first bearing seat, and the deflection angle of the brake shaft at the second bearing seat;

[0008] According to the simulation result of the brake shaft structure, it is judged whether it meets the corresponding permissible requirements, so as to decide whether to adjust the brake shaft structure according to the judgment result.

[0009] Furthermore, after obtaining the total brake lug tension and the drive lug tension by calculation according to the cable tension, the method further includes:

[0010] According to the total tension of the brake lug and the tension of the driving lug, calculating the additional torque obtained after translating the total tension of the brake lug and the tension of the driving lug to the center of the brake shaft;

[0011] Calculating the shear stress on the brake shaft according to the additional torque and the diameter of the brake shaft;

[0012] According to the shear stress on the brake shaft, it is judged whether it is less than the allowable shear stress of the material corresponding to the brake shaft, so as to decide whether to adjust the diameter of the brake shaft or modify the material of the brake shaft according to the judgment result.

[0013] Furthermore, judging whether the shear stress on the brake shaft is less than the allowable shear stress of the material corresponding to the brake shaft, so as to adjust the diameter of the brake shaft or modify the material of the brake shaft according to the judgment result, is specifically as follows:

[0014] According to the shear stress applied to the brake shaft, determine whether it is less than the allowable shear stress of the material corresponding to the brake shaft; if so, there is no need to adjust the diameter of the brake shaft or modify the material of the brake shaft; if not, increase the diameter of the brake shaft or modify the material of the brake shaft, and recalculate the shear stress applied to the brake shaft.

[0015] Furthermore, the total tension of the brake lug is calculated based on the cable tension as follows:

[0016] According to the cable tension, the total tension of the brake lug is calculated using the Euler formula.

[0017] Furthermore, the driving lug plate tension is calculated based on the cable tension as follows:

[0018] According to the brake shaft structure, the distance from the center of the drive lug hole to the center of the brake shaft, and the distance from the center of the brake lug hole to the center of the brake shaft are obtained;

[0019] The total tension of the brake lug is calculated based on the cable tension;

[0020] The driving lug plate pulling force is calculated according to the total pulling force of the brake lug plate, the distance from the center of the driving lug plate hole to the center of the brake shaft, and the distance from the center of the brake lug plate hole to the center of the brake shaft.

[0021] Furthermore, the simulation result of the brake shaft structure obtained by using finite element software according to the total tension of the brake lug and the tension of the driving lug further includes:

[0022] Using finite element software to establish a model of the brake shaft structure;

[0023] Applying boundary conditions to the established model according to the total brake lug tension and the drive lug tension;

[0024] Mesh the established model;

[0025] The simulation result of the brake shaft structure is obtained by solving.

[0026] Furthermore, the model of the brake shaft structure established by using finite element software is specifically as follows:

[0027] The model of the brake shaft structure is established by using finite element software using a line body plus a method of assigning cross-sectional characteristics.

[0028] Furthermore, the boundary conditions imposed on the established model according to the total tension of the brake lug and the tension of the driving lug are specifically:

[0029] Applying a driving ear plate tension force on the model at a location corresponding to the driving ear plate along the negative direction of the Y axis;

[0030] Applying brake lug tension to the first brake lug and the second brake lug on the model respectively along the positive direction of the Y axis, wherein the brake lug tension is equal to one half of the total brake lug tension;

[0031] The rotational displacement in the Z-axis direction is released at the positions corresponding to the first bearing seat and the second bearing seat on the model, and the displacements of the remaining five degrees of freedom at the positions corresponding to the first bearing seat and the second bearing seat on the model are set to zero.

[0032] Furthermore, the meshing of the established model is specifically as follows:

[0033] The created model is meshed using beam elements.

[0034] Further, judging whether the brake shaft structure meets corresponding permissible requirements according to the simulation result of the brake shaft structure, so as to decide whether to adjust the brake shaft structure according to the judgment result, is specifically as follows:

[0035] According to the simulation results of the brake shaft structure, it is judged whether it meets the corresponding allowable requirements. If the normal stress on the brake shaft, the reaction force on the first bearing seat, the reaction force on the second bearing seat, the deflection angle of the brake shaft at the first bearing seat, and the deflection angle of the brake shaft at the second bearing seat are all smaller than the corresponding allowable requirements, the brake shaft structure does not need to be adjusted;

[0036] If the normal stress on the brake shaft is greater than the allowable normal stress of the material corresponding to the brake shaft, the diameter of the brake shaft is modified, the material of the brake shaft is replaced, or the supporting position of the first bearing seat and / or the second bearing seat is modified, and the simulation result of the brake shaft structure is recalculated using finite element software;

[0037] If the reaction force on the first bearing seat and the reaction force on the second bearing seat are both greater than the rated force of the bearing seats, the models of the first bearing seat and the second bearing seat are replaced, and the simulation result of the brake shaft structure is recalculated using finite element software;

[0038] If the deflection angle of the brake shaft at the first bearing seat and the deflection angle of the brake shaft at the second bearing seat are both greater than the allowable rotation angle of the bearing seat, replace the models of the first bearing seat and the second bearing seat, or modify the support position of the first bearing seat and / or the second bearing seat, and use finite element software to recalculate the simulation result of the brake shaft structure.

[0039] It can be seen from the above technical solution that the strength calculation method of the brake shaft structure of a logging winch provided by the present invention has the following beneficial effects:

[0040] The method of the present invention is used to determine whether the simulation results of the brake shaft structure meet the allowable requirements of the corresponding components, so that it can be determined whether to adjust the brake shaft structure based on the determination result to ensure structural safety. At the same time, the overall replacement of the logging winch is avoided, the cost is reduced, and a brake shaft structure that meets the requirements is obtained at a relatively small cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the belt brake structure of the logging winch;

[0042] Figure 2 is a schematic diagram of a brake shaft structure with a brake pump;

[0043] Figure 3 A method flow chart of a method for calculating the strength of a brake shaft structure of a well logging drawworks according to an embodiment of the present invention;

[0044] Figure 4 is a schematic diagram of the drum part;

[0045] Figure 5 This is a simplified mechanical model of the drum brake band.

[0046] Figure 6 is a schematic diagram of the brake shaft structure;

[0047] Figure 7 It is a line model established in finite element software;

[0048] Figure 8The cross-sectional properties assigned to the line body model;

[0049] Fig. 9 This is a schematic diagram after boundary conditions are applied to the model;

[0050] Fig.10 This is the result diagram of the normal stress on the brake shaft obtained by simulation;

[0051] Fig.11 This is a screenshot of the simulated reaction force on the second bearing seat;

[0052] Fig.12 This is a screenshot of the simulated reaction force on the first bearing seat;

[0053] Fig.13 The displacement diagram of point c obtained by simulation;

[0054] Fig.14 This is the displacement diagram of point d obtained by simulation. DETAILED DESCRIPTION

[0055] In order to better understand the purpose, structure and function of the present invention, the strength calculation method of the brake shaft structure of a well logging drawworks of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0056] like Figure 1 As shown, the belt brake structure of the logging drawworks includes two brake belts 1, a drum 2, a brake pump 3, and a brake shaft structure composed of a driving ear plate 4, a brake shaft 5, two brake ear plates and two bearing seats, wherein the cable is wound around the drum 2, and the belt brake structure drives the two brake belts 1 to move simultaneously through a brake pump 3 to achieve braking.

[0057] Again, if Figure 2 As shown, the brake shaft structure includes a brake shaft 5, on which a driving ear plate 4, a first bearing seat 6, a first brake ear plate 7, a second brake ear plate 8 and a second bearing seat 9 are sequentially arranged, wherein the driving ear plate 4 is connected to the brake pump 3 for providing braking power.

[0058] Among them, the bearings at the first bearing seat and the second bearing seat are both spherical bearings, and the spherical bearings are allowed to have a certain rotation angle θ when working; therefore, the purpose of the strength calculation of the embodiment of the present invention is to ensure that after the cable tension is increased, the brake shaft, the first bearing seat and the second bearing seat can work normally without plastic deformation, and at the same time, the deflection angle of the brake shaft at the first bearing seat and the deflection angle of the brake shaft at the second bearing seat are both less than θ.

[0059] The strength calculation method of the brake shaft structure of the logging winch in the embodiment of the present invention is used to check the Figure 2The strength of the brake shaft structure in the well logging winch can be improved to replace parts that do not meet the strength requirements, such as modifying the diameter of the brake shaft, changing the positions of the first bearing seat and the second bearing seat, or changing the models of the first bearing seat and the second bearing seat, so as to obtain a brake shaft structure that meets the strength requirements, thereby avoiding the overall replacement of the well logging winch.

[0060] Specifically, Figure 3 As shown, the strength calculation method of the brake shaft structure of the logging drawworks according to the embodiment of the present invention includes:

[0061] S110: Calculating the total tension of the brake lug and the tension of the driving lug according to the cable tension;

[0062] S120: according to the total tension of the brake lug and the tension of the driving lug, using finite element software to obtain a simulation result of the brake shaft structure, the simulation result of the brake shaft structure includes: the normal stress on the brake shaft, the reaction force on the first bearing seat, the reaction force on the second bearing seat, the deflection angle of the brake shaft at the first bearing seat, and the deflection angle of the brake shaft at the second bearing seat;

[0063] S140: judging whether the brake shaft structure meets corresponding permissible requirements according to the simulation result of the brake shaft structure, so as to decide whether to adjust the brake shaft structure according to the judgment result.

[0064] In step S110, the driving lug tension is calculated based on the cable tension and specifically: the total brake lug tension is calculated based on the cable tension using the Euler formula.

[0065] Specifically, Figure 4 As shown, the cable is wound on the drum 2, and the cable tension is set to F. Then the total tension of the brake lug can be calculated based on the cable tension. The total tension of the brake lug is set to F1. The mechanical model of the drum part is as follows Figure 5 As shown, the total tension of the brake lug can be obtained by using the Euler formula according to the cable tension. Specifically, the formula for calculating the total tension of the brake lug is as follows:

[0066]

[0067] Among them, in the above formula, e is the natural base, μ is the friction coefficient, and α is the brake belt wrap angle.

[0068] Wherein, in step S110, calculating the driving lug plate tension according to the cable tension further includes:

[0069] According to the brake shaft structure, the distance from the center of the drive ear plate hole to the center of the brake shaft, and the distance from the center of the brake ear plate hole to the center of the brake shaft are obtained;

[0070] The total tension of the brake lug is calculated based on the cable tension;

[0071] The driving lug plate pulling force is calculated based on the total pulling force of the brake lug plate, the distance from the center of the driving lug plate hole to the center of the brake shaft, and the distance from the center of the brake lug plate hole to the center of the brake shaft.

[0072] Specifically, the distance from the center of the drive lug hole to the center of the brake shaft, and the distance from the center of the brake lug hole to the center of the brake shaft can be obtained according to the brake shaft structure, such as Figure 6 As shown, the drive ear plate hole refers to the hole connecting the drive ear plate and the brake pump part, the distance from the center of the drive ear plate hole to the center of the brake shaft is represented by A, the first brake ear plate and the second brake ear plate have the same structure and are equal in size, the brake ear plate hole refers to the hole on the brake ear plate used to connect with the brake band, the distance from the center of the brake ear plate hole to the center of the brake shaft is represented by B, and the sizes of A and B can be directly measured from the brake shaft structure.

[0073] According to the total brake lug tension F1 calculated above, the distance A from the center of the drive lug hole to the center of the brake shaft and the distance B from the center of the brake lug hole to the center of the brake shaft are measured. According to the moment balance, the moment of the brake shaft center can be taken to calculate the drive lug tension. Specifically, the drive lug tension is set to F2, and the formula for the drive lug tension is as follows:

[0074]

[0075] Wherein, after step S110, the strength calculation method further includes:

[0076] S130: Calculate the shear stress on the brake shaft based on the total tension of the brake lug and the tension of the driving lug, and determine whether it is less than the allowable shear stress of the material corresponding to the brake shaft, so as to decide whether to adjust the diameter of the brake shaft or modify the material of the brake shaft based on the determination result.

[0077] Specifically, step S130 calculates the shear stress on the brake shaft according to the total tension of the brake lug and the tension of the driving lug, and determines whether the shear stress is less than the allowable shear stress of the material corresponding to the brake shaft, so as to determine whether to adjust the diameter of the brake shaft or modify the material of the brake shaft according to the judgment result. The method further includes:

[0078] According to the total tension of the brake lug plate and the tension of the driving lug plate, the additional torque obtained after the total tension of the brake lug plate and the tension of the driving lug plate are translated to the center of the brake shaft is calculated;

[0079] According to the additional torque and the diameter of the brake shaft, the shear stress on the brake shaft is calculated;

[0080] According to the shear stress on the brake shaft, it is judged whether it is less than the allowable shear stress of the material corresponding to the brake shaft, so as to decide whether to adjust the diameter of the brake shaft or modify the material of the brake shaft according to the judgment result.

[0081] Specifically, after obtaining the total tension of the brake ear plate and the driving ear plate tension, the magnitude of the force is kept unchanged, and after the total tension of the brake ear plate and the driving ear plate tension are translated to the center of the brake shaft, an additional torque will be generated; based on the additional torque and the diameter of the brake shaft, the shear stress on the brake shaft can be calculated; based on the shear stress on the brake shaft, it can be determined whether the shear stress on the brake shaft is within the allowable shear stress range of the material corresponding to the brake shaft, so as to decide whether to adjust the diameter of the brake shaft or modify the material of the brake shaft based on the judgment result.

[0082] Wherein, the additional torque is set to T, then T=F2×A.

[0083] Assuming the brake shaft diameter is D and the shear stress on the brake shaft is τ, then

[0084] Among them, according to the shear stress received by the brake shaft, it is judged whether it is less than the allowable shear stress of the material corresponding to the brake shaft, so as to adjust the diameter of the brake shaft or modify the material of the brake shaft according to the judgment result. Specifically: according to the shear stress received by the brake shaft, it is judged whether it is less than the allowable shear stress of the material corresponding to the brake shaft; if so, there is no need to adjust the diameter of the brake shaft or modify the material of the brake shaft; if not, increase the diameter of the brake shaft or modify the material of the brake shaft, and recalculate the shear stress received by the brake shaft.

[0085] Through the above steps, the brake shaft diameter or brake shaft material that can meet the tension of the replaced cable can be obtained, so the brake shaft diameter can be replaced or the brake shaft material can be modified to adapt to the cable with increased tension.

[0086] Wherein, in step S120, according to the total tension of the brake lug and the tension of the driving lug, the simulation result of the brake shaft structure obtained by using finite element software further includes:

[0087] Use finite element software to build a model of the brake shaft structure;

[0088] According to the total tension of the brake lug and the tension of the driving lug, boundary conditions are applied to the established model;

[0089] Mesh the established model;

[0090] The simulation results of the brake shaft structure are obtained by solving.

[0091] Specifically, in order to reduce the amount of calculation and shorten the iteration time, the model of the brake shaft structure is established by using finite element software in this embodiment: the model of the brake shaft structure is established by using finite element software using a method of line body plus cross-sectional characteristics, wherein: Figure 7 is a line model established in the finite element software, where Figure 7 H4 represents the distance between the second bearing seat and the second brake lug, H5 represents the distance between the first brake lug and the second brake lug, H6 represents the distance between the first bearing seat and the first brake lug, and H7 represents the distance between the driving lug and the first bearing seat; Figure 8 is the cross-sectional property assigned to the linear model, where R represents the radius of the brake shaft. The modeling method of this embodiment greatly reduces the amount of calculation and shortens the iteration time.

[0092] Among them, according to the total tension of the brake lug and the tension of the driving lug, the boundary conditions imposed on the established model are as follows:

[0093] Apply a driving lug tension force along the negative direction of the Y axis at the corresponding driving lug on the model;

[0094] Apply brake lug tension to the first brake lug and the second brake lug on the model along the positive direction of the Y axis, respectively, and the brake lug tension is equal to one half of the total brake lug tension;

[0095] The rotational displacement in the Z-axis direction is released at the positions corresponding to the first bearing seat and the second bearing seat on the model, and the displacements of the remaining five degrees of freedom at the positions corresponding to the first bearing seat and the second bearing seat on the model are set to zero.

[0096] like Fig. 9 As shown, Fig. 9 Point a corresponds to the driving ear plate, point b corresponds to the first bearing seat, point e corresponds to the second bearing seat, Fb and Fe indicate that the brake shaft has a rotational displacement along the Z-axis direction at the first bearing seat and the second bearing seat, point c corresponds to the first brake ear plate, and point d corresponds to the second brake ear plate.

[0097] The meshing of the established model is specifically as follows: meshing the established model using beam units.

[0098] In the specific implementation, ANSYS software is used for simulation. Taking the cable tension F as 100KN, e as 2.718, μ as 0.4, α as 270° as an example, the number of units divided in ANSYS software is 56, and the number of nodes is 113 as an example, the normal stress of the brake shaft is obtained as follows Fig.10 As shown, the reaction force on the second bearing seat is obtained as follows Fig.11 As shown, the reaction force on the second bearing seat is 12625N, and the direction is along the negative direction of the Y axis. The result of the reaction force on the first bearing seat is as follows Fig.12 As shown, the reaction force on the first bearing seat is 5624.7N, and the direction is along the positive direction of the Y axis. The displacement of point c is as follows Fig.13 As shown, the displacement of point d is Fig.14As shown, the deflection angle of the brake shaft at the first bearing seat can be solved according to the displacement value of point c combined with the distance bc. The deflection angle of the brake shaft at the first bearing seat is 3.07 degrees. The deflection angle of the brake shaft at the second bearing seat can be solved according to the displacement value of point d combined with the distance de. The deflection angle of the brake shaft at the second bearing seat is 3.22 degrees.

[0099] That is, through the above simulation, the normal stress on the brake shaft, the reaction force on the first bearing seat, the reaction force on the second bearing seat, the deflection angle of the brake shaft at the first bearing seat, and the deflection angle of the brake shaft at the second bearing seat are obtained.

[0100] In step S140, according to the simulation result of the brake shaft structure, it is judged whether it meets the corresponding permissible requirements, so as to decide whether to adjust the brake shaft structure according to the judgment result. Specifically, the following is done:

[0101] According to the simulation results of the brake shaft structure, determine whether it meets the corresponding allowable requirements. If the normal stress on the brake shaft, the reaction force on the first bearing seat, the reaction force on the second bearing seat, the deflection angle of the brake shaft at the first bearing seat, and the deflection angle of the brake shaft at the second bearing seat are all less than the corresponding allowable requirements, there is no need to adjust the brake shaft structure;

[0102] If the normal stress on the brake shaft is greater than the allowable normal stress of the material corresponding to the brake shaft, the diameter of the brake shaft is modified, the material of the brake shaft is replaced, or the support position of the first bearing seat and / or the second bearing seat is modified, and the simulation result of the brake shaft structure is recalculated using finite element software;

[0103] If the reaction force on the first bearing seat and the reaction force on the second bearing seat are both greater than the rated force of the bearing seat, the models of the first bearing seat and the second bearing seat are replaced, and the simulation results of the brake shaft structure are recalculated using finite element software;

[0104] If the deflection angle of the brake shaft at the first bearing seat and the deflection angle of the brake shaft at the second bearing seat are both greater than the allowable rotation angle of the bearing seat, replace the models of the first bearing seat and the second bearing seat, or modify the support position of the first bearing seat and / or the second bearing seat, and use finite element software to recalculate the simulation results of the brake shaft structure.

[0105] Specifically, after calculating the simulation results of the brake shaft, it is necessary to determine whether the calculation results are all less than the corresponding allowable requirements. If the calculation results are all less than the corresponding allowable requirements, there is no need to replace the various components of the brake shaft structure; if some calculation results do not meet the requirements, it is necessary to make corresponding replacements and then recalculate each simulation result until all simulation results after replacement meet the requirements that are less than the corresponding allowable requirements.

[0106] After the model is established in the embodiment of the present invention, the calculation time used for simulation using finite element software is 6 seconds, and the memory consumption is 352MB, which has the advantage of rapid calculation iteration; the method of line body plus cross-sectional characteristics is used for modeling, which is convenient for modifying the model and calculating iteration, eliminates stress concentration in the algorithm, and can better simulate static load conditions; according to the force translation theorem, the force acting on the ear plate is transferred to the center of the brake shaft, and the shear stress is independently checked, which is convenient for the design and implementation of boundary conditions under actual working conditions; this embodiment extracts the reaction force exerted on the bearing, and selects the bearing seat according to the reaction force matching; this embodiment extracts the displacement at the two brake ear plates, which is convenient for calculating the deflection angles of the two bearings.

[0107] The method of the present invention is used to determine whether the simulation result of the brake shaft structure meets the allowable requirements of the corresponding components, so that it can be determined whether to adjust the brake shaft structure based on the determination result, thereby avoiding the overall replacement of the logging winch, reducing costs, and obtaining a brake shaft structure that meets the requirements at a relatively low cost.

[0108] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0109] In addition, the terms "one", "two", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0110] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for calculating the strength of a brake shaft structure of a logging winch, wherein the brake shaft structure comprises a brake shaft, and a driving lug plate, a first bearing seat, a first brake lug plate, a second brake lug plate and a second bearing seat are sequentially arranged on the brake shaft, characterized in that: The method comprises: The total tension of the brake lug and the tension of the driving lug are calculated based on the cable tension; According to the total tension of the brake lug and the tension of the driving lug, the simulation result of the brake shaft structure is obtained by using finite element software, and the simulation result of the brake shaft structure includes: the normal stress on the brake shaft, the reaction force on the first bearing seat, the reaction force on the second bearing seat, the deflection angle of the brake shaft at the first bearing seat, and the deflection angle of the brake shaft at the second bearing seat; According to the simulation result of the brake shaft structure, it is judged whether it meets the corresponding permissible requirements, so as to decide whether to adjust the brake shaft structure according to the judgment result.

2. The strength calculation method of the brake shaft structure of the logging winch according to claim 1 is characterized in that: After obtaining the total brake lug tension and the drive lug tension by calculation according to the cable tension, the method further includes: According to the total tension of the brake lug and the tension of the driving lug, calculating the additional torque obtained after translating the total tension of the brake lug and the tension of the driving lug to the center of the brake shaft; Calculating the shear stress on the brake shaft according to the additional torque and the diameter of the brake shaft; According to the shear stress on the brake shaft, it is judged whether it is less than the allowable shear stress of the material corresponding to the brake shaft, so as to decide whether to adjust the diameter of the brake shaft or modify the material of the brake shaft according to the judgment result.

3. The strength calculation method of the brake shaft structure of the logging winch according to claim 2 is characterized in that: The method of judging whether the shear stress on the brake shaft is less than the allowable shear stress of the material corresponding to the brake shaft, so as to adjust the diameter of the brake shaft or modify the material of the brake shaft according to the judgment result, is specifically as follows: According to the shear stress applied to the brake shaft, determine whether it is less than the allowable shear stress of the material corresponding to the brake shaft; if so, there is no need to adjust the diameter of the brake shaft or modify the material of the brake shaft; if not, increase the diameter of the brake shaft or modify the material of the brake shaft, and recalculate the shear stress applied to the brake shaft.

4. The strength calculation method of the brake shaft structure of the logging winch according to claim 1 is characterized in that: The total tension of the brake lug is calculated based on the cable tension: According to the cable tension, the total tension of the brake lug is calculated using the Euler formula.

5. The strength calculation method of the brake shaft structure of the logging winch according to claim 1 is characterized in that: The driving lug plate tension calculated based on the cable tension is: According to the brake shaft structure, the distance from the center of the drive lug hole to the center of the brake shaft, and the distance from the center of the brake lug hole to the center of the brake shaft are obtained; The total tension of the brake lug is calculated based on the cable tension; The driving lug plate pulling force is calculated according to the total pulling force of the brake lug plate, the distance from the center of the driving lug plate hole to the center of the brake shaft, and the distance from the center of the brake lug plate hole to the center of the brake shaft.

6. The strength calculation method of the brake shaft structure of the logging winch according to claim 1, characterized in that: The simulation result of the brake shaft structure obtained by using finite element software according to the total tension of the brake lug and the tension of the driving lug further includes: Using finite element software to establish a model of the brake shaft structure; Applying boundary conditions to the established model according to the total brake lug tension and the drive lug tension; Mesh the established model; The simulation result of the brake shaft structure is obtained by solving.

7. The strength calculation method of the brake shaft structure of the logging winch according to claim 6 is characterized in that: The model of the brake shaft structure established by using finite element software is specifically as follows: The model of the brake shaft structure is established by using finite element software using a line body plus a method of assigning cross-sectional characteristics.

8. The strength calculation method of the brake shaft structure of the logging winch according to claim 6 is characterized in that: The boundary conditions imposed on the established model according to the total tension of the brake lug and the tension of the driving lug are specifically: Applying a driving ear plate tension force on the model at a location corresponding to the driving ear plate along the negative direction of the Y axis; Applying brake lug tension to the first brake lug and the second brake lug on the model respectively along the positive direction of the Y axis, wherein the brake lug tension is equal to one half of the total brake lug tension; The rotational displacement in the Z-axis direction is released at the positions corresponding to the first bearing seat and the second bearing seat on the model, and the displacements of the remaining five degrees of freedom at the positions corresponding to the first bearing seat and the second bearing seat on the model are set to zero.

9. The strength calculation method of the brake shaft structure of the logging winch according to claim 6, characterized in that: The meshing of the established model is specifically as follows: The created model is meshed using beam elements.

10. The strength calculation method of the brake shaft structure of the logging drawworks according to claim 1, characterized in that: The method of judging whether the brake shaft structure meets the corresponding permissible requirements according to the simulation result of the brake shaft structure, so as to decide whether to adjust the brake shaft structure according to the judgment result, is specifically as follows: According to the simulation results of the brake shaft structure, it is judged whether it meets the corresponding allowable requirements. If the normal stress on the brake shaft, the reaction force on the first bearing seat, the reaction force on the second bearing seat, the deflection angle of the brake shaft at the first bearing seat, and the deflection angle of the brake shaft at the second bearing seat are all smaller than the corresponding allowable requirements, the brake shaft structure does not need to be adjusted; If the normal stress on the brake shaft is greater than the allowable normal stress of the material corresponding to the brake shaft, the diameter of the brake shaft is modified, the material of the brake shaft is replaced, or the supporting position of the first bearing seat and / or the second bearing seat is modified, and the simulation result of the brake shaft structure is recalculated using finite element software; If the reaction force on the first bearing seat and the reaction force on the second bearing seat are both greater than the rated force of the bearing seats, the models of the first bearing seat and the second bearing seat are replaced, and the simulation result of the brake shaft structure is recalculated using finite element software; If the deflection angle of the brake shaft at the first bearing seat and the deflection angle of the brake shaft at the second bearing seat are both greater than the allowable rotation angle of the bearing seat, replace the models of the first bearing seat and the second bearing seat, or modify the support position of the first bearing seat and / or the second bearing seat, and use finite element software to recalculate the simulation result of the brake shaft structure.

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