Method for calculating horizontal force of cart wheels of wharf rail-mounted mobile equipment to rail

Abstract

The invention discloses a method for calculating the horizontal force of cart wheels of wharf rail-mounted mobile equipment on a rail, which comprises the step of calculating the horizontal force when the cart of the rail-mounted mobile equipment is in a stop state and a moving state, and the horizontal force borne by the rail comprises a horizontal component force Fc perpendicular to the direction of the rail and a horizontal component force Fp along the direction of the rail; according to the method for calculating the horizontal force of the track, the horizontal force is divided into the horizontal component force Fc perpendicular to the track and the horizontal component force Fp parallel to the track to be calculated respectively according to the actual condition of the horizontal force borne by the track, the horizontal component force calculation method integrates track installation errors, equipment design parameters and wind loads of corresponding wind directions, parameter design is reasonable, and the reliability is high. The calculation formula is reliable, the actual stress condition is fully and comprehensively reflected, meanwhile, the stress conditions of the track in different limit states are fully considered in the calculation method, installation is guided through calculated values, the installation reliability is high, and the port engineering construction cost is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of track force calculation, and in particular to a method for calculating the horizontal force of a wheel pair of a track of a dock track-type mobile equipment trolley. Background Art

[0002] For four-column-legged rail-mounted mobile equipment trolleys, the horizontal forces applied to the tracks in static and dynamic conditions need to be calculated to guide the selection and installation of the connecting parts of the tracks on the dock. There is no complete reference and usable calculation method for the horizontal forces on the tracks in the prior art. According to Table C.0.4 of Appendix C of the "Port Engineering Load Code" JTS144-1-2010, "the standard values ​​of horizontal forces perpendicular and parallel to the track direction can be estimated as 1 / 10 of the standard wheel pressure value", and this estimation method is an empirical estimation. This value does not take into account factors such as the track state, wind speed, and different dynamic and static pressure conditions of the equipment, and cannot fully reflect the actual force conditions of the wheels of the mobile equipment trolley on the track. If the horizontal force is estimated as 1 / 10 of the standard wheel pressure value, the value is generally large, which will result in higher port engineering construction costs; if the horizontal force is estimated as less than 1 / 10 of the standard wheel pressure value, there is a lack of relevant basis, which may lead to insufficient installation reliability and safety hazards. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects in the prior art and provide a method for calculating the horizontal force of the wheel pair of a dock rail-type mobile equipment trolley, so as to overcome one or more problems caused by the limitations and defects of the relevant technology to a certain extent.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows:

[0005] A method for calculating the horizontal force of the wheel pair of a dock rail-type mobile equipment trolley. Under a set wind speed, the horizontal force on the track is calculated by integrating the machining and installation errors of the track. The calculation of the horizontal force includes the horizontal component force F perpendicular to the track direction. c and the horizontal force F along the track direction p Calculation of; where,

[0006] Horizontal force perpendicular to the track direction Among them, F c1 F is the first lateral tilting force generated by the track level difference under the wheel pressure F1; c2 F is the second lateral tilt force generated by the track tilt under the wheel pressure F1; fc The rail-mounted mobile equipment trolley is subjected to wind loads perpendicular to the track direction;

[0007] Horizontal force along the track Among them, Fz is the ramp resistance caused by the track straightness error under the wheel pressure F1; pc The rail-mounted mobile equipment trolley is subjected to wind loads along the track direction;

[0008] Compare the horizontal force F perpendicular to the track direction c and the horizontal force F along the track direction p As a result, the larger value of the two is used as the horizontal force for track design.

[0009] Furthermore, the track is divided into two levels of design, namely the local key parking track and the working track; when the track-mounted mobile equipment vehicle is stopped and subjected to the maximum wind load, the parking horizontal force F on the local key parking track is calculated. t , as the design basis for the local key parking track; the track-mounted mobile equipment vehicle is in a moving state and at the working wind speed, calculate the working horizontal force F on the working track d , as the design basis for the working track.

[0010] Furthermore, the working track is subjected to a horizontal component force F perpendicular to the track direction. tc , Among them, F tfc Under the maximum non-operating wind speed, the rail-mounted mobile equipment trolley is subjected to wind load perpendicular to the track direction; the working track is subjected to the horizontal component force F along the track direction tp , Among them, F tpc The wind load on the track-mounted mobile equipment trolley in the maximum non-operating wind speed is F. t Take F tc and F tp The larger value in .

[0011] Furthermore, the working track is subjected to a horizontal force F perpendicular to the track direction. dc , Among them, F dfc F is the wind load on the track-mounted mobile equipment vehicle in the direction perpendicular to the track under the working wind speed. s It is the lateral load caused by the skewed operation of the rail-mounted mobile equipment trolley;

[0012] The track is subjected to the horizontal force F along the track direction. dp , Among them, F dpc F is the wind load on the track-mounted mobile equipment vehicle under the working wind speed. m It is the running friction resistance of the rail-mounted mobile equipment trolley;

[0013] Working horizontal force F d Take F dc and F dp The larger value in .

[0014] Furthermore, F c1 Calculated by the formula, Where: E is the height difference between two corresponding track measuring points at right angles to any point on the track, S is the track gauge; F c2 Calculated by the formula, Where: G is the inclination of the rail cross section at any point on the track (‰).

[0015] Furthermore, F z Calculated by the formula, Where: c is the straightness tolerance of any point on the top of the track within the 2000mm detection length.

[0016] Furthermore, F s Calculated by the formula, λ is the horizontal lateral load factor; F m Calculated by the formula, Where: D is the wheel tread diameter, f k is the rolling friction arm of the wheel along the track, C f is the additional friction resistance coefficient between the wheel flange and the rail top side;

[0017] Furthermore, the wheel pressure F1 should be integrated with the wind effect, and the wheel pressure integrated with the wind pressure perpendicular to the track direction is recorded as F 1c The wheel pressure of the wind pressure along the track direction is recorded as F 1p ,but:

[0018] F c1 The calculation formula is:

[0019] F c2 The calculation formula is:

[0020] F s The calculation formula is:

[0021] F z The calculation formula is:

[0022] F m The calculation formula is:

[0023] Compared with the prior art, the method for calculating the horizontal force of the wheel of a dock rail-type mobile equipment trolley of the present invention has the following beneficial effects:

[0024] 1. According to the actual situation of the track under horizontal force, the horizontal force is divided into the horizontal component force F perpendicular to the track c and the horizontal force F parallel to the track p The calculation method of horizontal force is based on the track installation error, equipment design parameters and wind load of corresponding wind direction. The parameter design is reasonable, the calculation formula is reliable, and the actual force situation is fully and comprehensively reflected.

[0025] 2. The calculation method fully considers the stress conditions of the track under different limit states. First, the disaster resistance strength of the key track for parking the rail-mounted mobile equipment vehicle is considered. Second, the track installation strength when the rail-mounted mobile equipment vehicle is working under extreme weather conditions is considered. The maximum value of the horizontal force under different limit states is used as the working stress to guide the installation design of the overall track and local key track respectively, so as to meet the strength design requirements and reduce the cost of track installation. The actual comparison results show that there is a certain deviation between the actual calculation results and the empirical estimation values ​​of the existing technology. Using the calculated values ​​to guide the installation can improve the installation reliability and effectively reduce the cost of port engineering construction.

[0026] 3. Different from the existing technology, the wheel pressure in the horizontal force mathematical formula is the wheel pressure value under the wind effect in the corresponding direction. The wheel pressure can better reflect the pressure of the wheels of the mobile equipment vehicle on the track under the extreme state, thereby improving the rationality and reliability of the calculation formula. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the track being subjected to a horizontal force Fc perpendicular to the track direction;

[0028] Figure 2 It is a schematic diagram of the track being subjected to a horizontal force Fp parallel to the track direction;

[0029] Figure 3 It is a schematic diagram of the track horizontal height difference E;

[0030] Figure 4 is a schematic diagram of the track cross-section inclination G;

[0031] Figure 5 Schematic diagram of straightness tolerance c.

[0032] In the figure: 1. Wheel; 2. Track. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only the best embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The horizontal force on track 2 needs to be calculated separately for the horizontal force Fc perpendicular to the track direction and the horizontal force Fp parallel to the track direction, and the result is assigned to the maximum value of the two; the force conditions of track 2 under different limit states should be considered during the calculation. First, the steady-state operation requirements of the track-mounted mobile equipment trolley under the working wind speed should be considered, and the horizontal force of the track-mounted mobile equipment trolley when working under the set working wind speed should be calculated to guide the installation design of the working track; second, the disaster resistance capacity of track 2 should be met, and the horizontal force of the track-mounted mobile equipment trolley on the key parking track when it is stationary under the maximum non-working wind speed should be calculated to guide the installation design of the local key parking track;

[0035] The two horizontal forces should be calculated in two cases, namely: ① when the track-mounted mobile equipment vehicle stops at the maximum non-working wind speed, the track 2 is subjected to horizontal force; ② when the track-mounted mobile equipment vehicle moves at the set working wind speed, the track 2 is subjected to horizontal force; in addition, the calculation of horizontal force needs to comprehensively consider the design parameters of the track-mounted mobile equipment vehicle, the pressure parameters under wind load, and the laying state of track 2; for the technical parameters and calculation methods that should be comprehensively considered in the calculation of the track horizontal force involved above, there is no calculation method that can be referred to or guided in the existing technology;

[0036] Therefore, a method for calculating the horizontal force of the wheel pair of a dock rail-type mobile equipment trolley is proposed. The method includes the calculation of horizontal forces in two states and the calculation of horizontal forces in two directions, namely: the rail-type mobile equipment trolley is in a stopped state and a moving state, and the horizontal component force F perpendicular to the track direction c and the horizontal force F along the track direction p , F c and F p The instructions are as follows Figure 1 and Figure 2 As shown, the calculation method of the best embodiment of the present invention is described and demonstrated with a calculation example of a specific project below:

[0037] Take the 3200t / h bridge grab ship unloader of a project in Lanshan Port of Rizhao Port as an example. The trolley of the bridge grab ship unloader is a four-column leg 48-wheel, and its parameters are as follows:

[0038] (I) Taking the maximum wind speed of 55m / s in the area as the maximum non-operating wind speed, the wind direction is perpendicular to the track direction, the bridge grab ship unloader trolley stops on the key stop track 2, and the horizontal component of the force perpendicular to the track direction of the wheel 1 on the key stop track 2 is a combination of the following three items: ①) The wheel pressure F at the maximum non-operating wind speed 1c Under the action of c1 , which can be obtained through detection means, and the formula is preferably used for calculation and assignment, such as Figure 3 As shown, the determination of track level height difference E refers to the relevant provisions of standard GB / T 10183.1-2018 crane wheel and trolley and car track tolerance; ② At the maximum non-working wind speed, the wheel pressure F 1c Under the action of the second lateral tilt force F generated by the track cross section inclination G c2 , similarly, it can be obtained by detection means. In this embodiment, the formula is preferably used to calculate the value, such as Figure 4 As shown, the determination of the track cross-section inclination G refers to the relevant provisions of the standard GB / T10183.1-2018 Crane Wheel and Carriage and Trolley Track Tolerances; ③ Wind load F at the maximum non-working wind speed perpendicular to the track direction tfc , the calculation of wind load can refer to the standard GB / T3811-2018 Crane Design Specification;

[0039] The key parking track 2 is subjected to a horizontal force F perpendicular to the track direction. tc The comprehensive calculation formula is:

[0040]

[0041] Table 1 Numerical table of each item in formula (1)

[0042]

[0043] Substitute the values ​​of each parameter in Table 1 into formula (1) to calculate F tc =68.06kN;

[0044] (ii) Similarly, the maximum non-operating wind speed is set to be along the track direction, the wind speed is 55m / s, the bridge grab ship unloader trolley stops, and the horizontal component force F acting on the track 2 by wheel 1 along the track direction is tp The following two items should be considered: ① The wheel pressure F at the maximum non-operating wind speed 1p Under the action of the slope resistance F generated by the track straightness error c z ,like Figure 5As shown, the determination of the track straightness error c refers to the relevant provisions of the standard GB / T 10183.1-2018 Crane wheel and trolley and car track tolerance; ② Under the maximum non-working wind speed, the track-mounted mobile equipment trolley is subjected to the wind load F along the track direction tpc , the calculation of wind load can refer to the standard GB / T 3811-2018 Crane Design Specification;

[0045] The key parking track 2 is subjected to the horizontal force F along the track direction. tp The comprehensive calculation formula is:

[0046]

[0047] Table 2 Numerical table of each item in formula (2)

[0048]

[0049] Substitute the values ​​of each parameter in Table 2 into formula (2) to calculate F tp =53.02kN;

[0050] (III) According to the average wind speed in the area throughout the year, the working wind speed is set to 20m / s, and the wind direction is perpendicular to the track direction. When the bridge grab ship unloader trolley is in the moving state, the working track 2 is subjected to the horizontal component force F perpendicular to the track direction. dc In addition to considering the first lateral tilting force F c1 , the second lateral tilting force F c2 and the wind load F at the set non-operating wind speed perpendicular to the track direction dfc , it is also necessary to add the horizontal lateral load F generated by the ship engine when it is running at an angle s According to the horizontal lateral load and simplified calculation formula in P133 of the standard GB / T 3811-2018 Crane Design Specification, F s It is related to the horizontal lateral load factor λ. The value of the horizontal lateral load factor λ is determined by referring to the provisions of P133-134 of the standard. Therefore, the horizontal component force F perpendicular to the track direction on the working track 2 is obtained. dc The comprehensive calculation formula is:

[0051]

[0052] Table 3 Numerical table of each item in formula (3)

[0053]

[0054] Substitute the values ​​of each parameter in Table 3 into formula (3) to calculate F dc =29.25kN;

[0055] (IV) Similarly, the working wind speed is set to be parallel to the track direction, the wind speed is 20m / s, the bridge grab ship unloader trolley is in the moving state, and the working track 2 is subjected to the horizontal component force F along the track direction. dp In addition to the slope resistance F z and wind load F dpc , also includes the running friction resistance F m According to the standard GB / T 3811-2018 Crane Design Specification P64, the working track 2 is subject to the running friction resistance F m The horizontal force generated by the action mainly considers the rolling friction resistance and additional friction resistance of the wheel tread. Therefore,

[0056] Then the working track 2 is subjected to the horizontal force F along the track direction. dp The comprehensive calculation formula is:

[0057]

[0058] Table 4 Numerical table of each item in formula (4)

[0059]

[0060]

[0061] Substitute the values ​​of each parameter in Table 4 into formula (4) to calculate F dp =9.36kN;

[0062] Based on the above values ​​and results, the results are summarized and analyzed, as shown in Table 5:

[0063] Table 5 Results comparison and analysis

[0064]

[0065] It can be seen that the actual horizontal force components taking into account the wind effect, equipment weight and maximum load are all smaller than the guidance values ​​of the existing standards. Therefore, designing the installation of Track 2 based on 10% of the maximum wheel pressure as the horizontal force in each direction will result in ineffective and inflated installation costs.

[0066] According to the calculation results of formula (1)-formula (4), select F dc and F dp The maximum value of 29.25 kN is used as the horizontal working stress on the working track 2 when operating at the working wind speed. tc and F tpThe maximum value, i.e. 68.06 kN, is used as the horizontal working stress on the local key stop track 2 under the maximum non-working wind speed, which guides the installation design and calculation of the overall and key parts of the track 2 respectively.

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for calculating the horizontal force of the wheel pair of a dock rail-type mobile equipment vehicle, characterized in that: Under a set wind speed, the horizontal force on the track is calculated by taking into account the machining and installation errors of the track. The calculation of the horizontal force includes the horizontal component force F perpendicular to the track direction. c and the horizontal force F along the track direction p Calculation of; where, Horizontal force perpendicular to the track direction Among them, F c1 F is the first lateral tilting force component generated by the track level difference under the wheel pressure F1; c2 is the second lateral tilting force component generated by the track tilt under the wheel pressure F1; fc The rail-mounted mobile equipment vehicle is subjected to wind loads perpendicular to the direction of the rails; Horizontal force along the track Among them, F z is the ramp resistance caused by the track straightness error under the wheel pressure F1; pc The rail-mounted mobile equipment vehicle is subjected to wind loads along the rail direction; Compare the horizontal force F perpendicular to the track direction c and the horizontal force F along the track direction p The larger value of the two is used as the horizontal force for track design based on the result data.

2. The method for calculating the horizontal force of the wheel pair of the dock rail-type mobile equipment trolley according to claim 1 is characterized in that: The track is divided into two levels of design, namely the local key parking track and the working track; when the track-type mobile equipment vehicle is stopped and subjected to the maximum wind load, the parking horizontal force F on the local key parking track is calculated. t , as the design basis of the local key parking track; the track-type mobile equipment vehicle is in a moving state and at the working wind speed, calculate the working horizontal force F on the working track d , as the design basis of the working track.

3. The method for calculating the horizontal force of the wheel pair of the dock rail-type mobile equipment trolley according to claim 2 is characterized in that: The working track is subjected to a horizontal component force F perpendicular to the track direction. tc , Among them, F tfc Under the maximum non-operating wind speed, the rail-mounted mobile equipment vehicle is subjected to a wind load perpendicular to the track direction; the working track is subjected to a horizontal component force F along the track direction. tp , Among them, F tpc The wind load on the track-mounted mobile equipment vehicle in the maximum non-operating wind speed is along the track direction; the horizontal force F t Take F tc and F tp The larger value in .

4. The method for calculating the horizontal force of the wheel pair of the dock rail-type mobile equipment vehicle according to claim 3 is characterized in that: The working track is subjected to a horizontal working force F perpendicular to the track direction. dc , F dc =F c1 +F c2 + Fd n fc +F s , where F dfc F is the wind load perpendicular to the track on the track-mounted mobile equipment vehicle under the working wind speed. s The lateral load caused by the skewed operation of the rail-mounted mobile equipment trolley; The track is subjected to the horizontal force F along the track direction. dp , Among them, F dpc F is the wind load on the track-mounted mobile equipment vehicle under the working wind speed. m is the running friction resistance of the rail-type mobile equipment trolley; Working horizontal force F d Take F dc and F dp The larger value in .

5. The method for calculating the horizontal force of the wheel pair of the dock rail-type mobile equipment trolley according to claim 4 is characterized in that: F c1 Calculated by the formula, Where: E is the height difference between two corresponding track measuring points at right angles to any point on the track, S is the track gauge; F c2 Calculated by the formula, Wherein: G is the inclination (‰) of the rail cross section at any point on the track.

6. The method for calculating the horizontal force of the wheel pair of the dock rail-type mobile equipment trolley according to claim 5 is characterized in that: F z Calculated by the formula, Where: c is the straightness tolerance of any point on the top of the track within the 2000mm detection length.

7. The method for calculating the horizontal force of the wheel pair of the dock rail-type mobile equipment trolley according to claim 6 is characterized by: F s Calculated by the formula, λ is the horizontal lateral load factor; F m Calculated by the formula, Where: D is the wheel tread diameter, f k is the rolling friction arm of the wheel along the track, C f It is the additional friction resistance coefficient of the friction between the wheel flange and the rail top side.

8. The method for calculating the horizontal force of the wheel pair of the dock rail-type mobile equipment trolley according to claim 7 is characterized in that: The wheel pressure F1 should be integrated with the wind effect, and the wheel pressure integrated with the wind pressure perpendicular to the track direction is recorded as F 1c The wheel pressure of the wind pressure along the track direction is recorded as F 1p ,but: F c1 The calculation formula is: F c2 The calculation formula is: F s The calculation formula is: F z The calculation formula is: F m The calculation formula is:

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