Method for determining reasonable rock digging construction parameter combination of cutter suction dredger

Abstract

The invention discloses a method for determining a reasonable rock digging construction parameter combination of a cutter suction dredger, which comprises the following steps of: assuming a reamer transverse moving speed and different reamer rotating speed construction parameter ranges according to conventional construction experience; calculating the average cutting speed of each cutter tooth in unit time; calculating the average cutting thickness of cutter teeth in unit time under different reamer rotating speed conditions and different reamer transverse moving speed conditions; calculating the average cutting force of the corresponding cutter teeth; calculating the average cutting power of each cutter tooth under different reamer rotating speed conditions and different reamer transverse moving speed conditions; calculating the instantaneous maximum power of the reamer; according to the fact that the instantaneous maximum power of the reamer should not exceed the reamer design power, a reasonable construction parameter combination of the reamer transverse moving speed, the reamer rotating speed and the reamer forward displacement under the rock digging strength condition is determined. The problem that when the cutter suction dredger conducts rock digging construction, construction parameters can only be roughly selected according to previous construction experience, and the construction efficiency cannot be accurately estimated is solved.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy and water transport engineering construction, and in particular to a method for determining a reasonable combination of construction parameters for rock excavation by a cutter suction vessel. Background Art

[0002] In the prior art, when a dredging vessel is used for rock excavation, the construction parameters can only be roughly selected based on previous construction experience, and the construction efficiency cannot be accurately estimated. When the construction parameters are not selected properly, the construction efficiency of the dredging vessel is easily too low, or the dredging drive motor is overpowered, resulting in the motor fuse being activated, and the work needs to be stopped to replace the fuse.

[0003] Therefore, in order to master the reasonable construction parameters of cutter suction dredge rock excavation, accurately estimate the construction efficiency, and ensure that the cutter suction dredge equipment can carry out rock excavation construction safely and efficiently, a method for determining the reasonable combination of construction parameters of cutter suction dredge rock excavation is provided. Summary of the invention

[0004] The purpose of the present invention is to overcome the existing defects and provide a method for determining a reasonable combination of construction parameters for rock excavation by a dredger suction dredge, which is used to solve the problem that in the prior art, when a dredger suction dredge is performing rock excavation construction, the construction parameters can only be roughly selected based on past construction experience, and a relatively accurate estimation of the construction efficiency cannot be achieved.

[0005] The technical solution to achieve the above purpose is:

[0006] A method for determining a reasonable combination of construction parameters for rock excavation by a cutter suction vessel, comprising:

[0007] Step S1, determining the number of reamer teeth, the designed cutting radius, the average width of the reamer cutting surface, and the longitudinal slope of the reamer cutting surface of the reamer, and assuming a reamer transverse speed and different reamer speed construction parameter ranges based on conventional construction experience;

[0008] Step S2, according to the designed cutting radius of each reamer tooth and the assumed reamer traverse speed, the average cutting speed per unit time of each reamer tooth under different reamer rotation speed conditions is calculated by integration;

[0009] Step S3, based on conventional construction experience, assuming different roughly appropriate reamer transverse movement speeds, and then calculating the average cutting thickness of the cutter teeth per unit time under different reamer rotation speed conditions and different reamer transverse movement speed conditions by integration;

[0010] Step S4, according to the average width of the cutting surface of the cutter teeth, the longitudinal slope of the cutting surface of the cutter teeth, and the average cutting thickness of the cutter teeth, respectively calculate the average cutting area of ​​the cutter teeth under different reamer speed conditions and different reamer traverse speed conditions, and respectively calculate the corresponding average cutting force of the cutter teeth in combination with the compressive strength of the rock to be excavated;

[0011] Step S5, calculating the average cutting power of each cutter tooth under different reamer rotation speed conditions and different reamer traverse speed conditions according to the average cutting speed and the average cutting force of each cutter tooth;

[0012] Step S6, summing the average cutting power of each cutter tooth under the same reamer speed condition and the reamer traverse speed condition, obtaining the average cutting power of a single cutter arm of the reamer under different reamer speed conditions and different reamer traverse speed conditions, and calculating the instantaneous maximum power of the reamer;

[0013] Step S7, based on the fact that the instantaneous maximum power of the reamer should not exceed the design power of the reamer, determine a reasonable construction parameter combination of the reamer transverse speed, reamer rotation speed, and reamer forward travel distance under the rock excavation intensity condition.

[0014] Preferably, in step S1, the number of teeth S of the reamer and the designed cutting radius R of each tooth are determined according to the actual design of the rock reamer. S , the average width of the cutting surface of the cutter teeth B, the longitudinal slope of the cutting surface of the cutter teeth k, and based on conventional construction experience, assuming a reamer traverse speed V h And the reamer speed ω, the value range of the reamer speed ω is in an interval [ω1,ω2], that is, ω1≤ω≤ω2.

[0015] Preferably, in step S2, during the reamer rock excavation construction process, the reamer teeth are driven by the reamer arm to make a circular motion, and the instantaneous cutting speed V of each tooth is DS is the tangential speed of the cutter teeth rotating around the reamer ωR S and the traverse speed V of the reamer h The time t required for the reamer to rotate 180° is 总 is the unit time. According to the cosine theorem, the integration is used to calculate the time per tooth per unit time t under different reamer speed conditions. 总 Average cutting speed The calculation formula is as follows:

[0016]

[0017] Preferably, in step S3, a reamer transverse speed range [V h1 ,V h2 ], that is, V h1 ≤V h ≤V h2 The cutting thickness of the cutter teeth is determined by the traverse speed V of the reamer. h Determined by the lateral velocity V perpendicular to the tooth trajectory hcAccording to the trigonometric function relationship, the average cutting thickness h of the cutter teeth per unit time under different reamer speed conditions and different reamer traverse speed conditions is calculated by integration. i , and its calculation formula is as follows:

[0018]

[0019] Preferably, in step S4, the average width B of the cutting surface of the cutter teeth, the longitudinal slope k of the cutting surface of the cutter teeth, and the average cutting thickness h of the cutter teeth are used. i , respectively calculate the average cutting area of ​​the cutter teeth under different reamer speed conditions and different reamer traverse speed conditions Then, according to the compressive strength σ of the rock to be excavated, the corresponding average cutting force of the cutter teeth is calculated. The calculation formula is as follows:

[0020]

[0021] Preferably, in step S5, according to the average cutting speed of each tooth Average cutting force of tooth Calculate the average cutting power of each cutter tooth under different reamer speed conditions and different reamer traverse speed conditions The calculation formula is as follows:

[0022]

[0023] Preferably, in step S6, according to construction experience, under different forward displacement L conditions, the number of cutter teeth N on each cutter arm involved in rock digging is different, and the average cutting power of each cutter tooth involved in rock digging under the same reamer speed condition and reamer traverse speed condition is calculated. The sum is calculated to obtain the average cutting power of a single cutter arm of the reamer under the same reamer speed and reamer traverse speed conditions. Considering the impact load multiple μ caused by the significant increase in instantaneous power in a short period of time when the reamer arm cuts into the hard rock, the reamer idling power P k And the number of blade arms M that cut into the hard rock layer at the same time when the reamer digs the rock, calculate the instantaneous maximum power P of the reamer max , and its calculation formula is as follows:

[0024]

[0025] Preferably, in step S7, the instantaneous maximum power P of the reamer under different reamer speed conditions and different reamer transverse speed conditions is max The reamer design power P should not be exceeded, i.e. according to P max ≤P, reversely determine the traverse speed V of the reamer under the rock excavation intensity conditionh , reasonable construction parameter combination of reamer speed ω, and forward distance L.

[0026] The beneficial effects of the present invention are as follows: the present invention clarifies the relationship between the auger structural parameters, rock characteristic parameters, construction process parameters and the auger construction power, and solves the problem that when the traditional dredging vessel is performing rock excavation construction, the construction parameters can only be roughly selected according to the previous construction experience, and the construction efficiency cannot be estimated more accurately; when the construction parameters are not selected reasonably, the construction efficiency of the dredging vessel is easily reduced, or the auger drive motor is overpowered, resulting in the motor fuse functioning, and the need to stop work and replace the fuse. The present invention has positive significance for determining a reasonable combination of construction parameters during rock excavation construction by the dredging vessel, evaluating the rock excavation construction efficiency, accurately calculating the construction period and construction cost, and protecting the safety of the auger drive motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a flow chart of a method for determining a reasonable combination of construction parameters for rock excavation by a cutter suction vessel. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] like Figure 1 As shown, a method for determining a reasonable combination of construction parameters for rock excavation by a cutter suction dredger includes:

[0031] Step S1, determining the number of auger teeth, the designed cutting radius, the average width of the cutting surface of the auger teeth, and the longitudinal slope of the cutting surface of the auger teeth, and assuming a roughly appropriate auger transverse speed and different auger speed construction parameter ranges based on conventional construction experience.

[0032] In the embodiment, according to the actual design of the rock reamer, the number of teeth S of the reamer and the design cutting radius R of each tooth are determined. S , the average width of the cutting surface of the cutter teeth B, the longitudinal slope of the cutting surface of the cutter teeth k, and based on conventional construction experience, assume a roughly appropriate reamer transverse speed V hand the reamer speed ω, the value range of the reamer speed ω is in a roughly appropriate interval [ω1,ω2], that is, ω1≤ω≤ω2.

[0033] Step S2, according to the designed cutting radius of each reamer tooth and the assumed reamer traverse speed, the average cutting speed per unit time of each reamer tooth under different reamer rotation speed conditions is calculated by integration.

[0034] In the embodiment, during the reamer rock excavation construction process, the reamer teeth are driven by the reamer arm to make circular motion, and the instantaneous cutting speed V of each tooth is DS is the tangential speed of the cutter teeth rotating around the reamer ωR S and the traverse speed V of the reamer h The time t required for the reamer to rotate 180° is 总 is the unit time. According to the cosine theorem, the integration is used to calculate the time per tooth per unit time t under different reamer speed conditions. 总 Average cutting speed The calculation formula is as follows:

[0035]

[0036] Step S3, based on conventional construction experience, assuming different approximately appropriate reamer transverse movement speeds, and then calculating the average cutting thickness of the cutter teeth per unit time under different reamer rotation speed conditions and different reamer transverse movement speed conditions by integration.

[0037] In the embodiment, based on construction experience, a roughly appropriate range of reamer traverse speed [V h1 ,V h2 ], that is, V h1 ≤V h ≤V h2 The cutting thickness of the cutter teeth is determined by the traverse speed V of the reamer. h Determined by the lateral velocity V perpendicular to the tooth trajectory hc According to the trigonometric function relationship, the average cutting thickness h of the cutter teeth per unit time under different reamer speed conditions and different reamer traverse speed conditions is calculated by integration. i , and its calculation formula is as follows:

[0038]

[0039] Step S4, according to the average width of the cutting surface of the cutter teeth, the longitudinal slope of the cutting surface of the cutter teeth, and the average cutting thickness of the cutter teeth, respectively calculate the average cutting area of ​​the cutter teeth under different reamer speed conditions and different reamer traverse speed conditions, and calculate the corresponding average cutting force of the cutter teeth respectively in combination with the compressive strength of the rock to be excavated.

[0040] In the embodiment, the average width B of the cutting surface of the blade teeth, the longitudinal slope k of the cutting surface of the blade teeth, and the average cutting thickness h of the blade teeth are used. i , respectively calculate the average cutting area of ​​the cutter teeth under different reamer speed conditions and different reamer traverse speed conditions Then, according to the compressive strength σ of the rock to be excavated, the corresponding average cutting force of the cutter teeth is calculated. The calculation formula is as follows:

[0041]

[0042] Step S5, according to the average cutting speed of each cutter tooth and the average cutting force of each cutter tooth, respectively calculate the average cutting power of each cutter tooth under different reamer rotation speed conditions and different reamer traverse speed conditions.

[0043] In the embodiment, according to the average cutting speed of each tooth Average cutting force of tooth Calculate the average cutting power of each cutter tooth under different reamer speed conditions and different reamer traverse speed conditions The calculation formula is as follows:

[0044]

[0045] Step S6, summing the average cutting powers of the various cutter teeth under the same reamer speed condition and the reamer traverse speed condition, obtaining the average cutting powers of a single cutter arm of the reamer under different reamer speed conditions and different reamer traverse speed conditions, and calculating the instantaneous maximum power of the reamer.

[0046] In the embodiment, according to construction experience, under different forward displacement L conditions, the number of cutter teeth N on each cutter arm involved in rock digging is different, and the average cutting power of each cutter tooth involved in rock digging under the same reamer speed and reamer traverse speed conditions is calculated. The sum is calculated to obtain the average cutting power of a single cutter arm of the reamer under the same reamer speed and reamer traverse speed conditions. Considering the impact load multiple μ caused by the significant increase in instantaneous power in a short period of time when the reamer arm cuts into the hard rock, the reamer idling power P k And the number of blade arms M that cut into the hard rock layer at the same time when the reamer digs the rock, calculate the instantaneous maximum power P of the reamer max , and its calculation formula is as follows:

[0047]

[0048] Step S7, based on the fact that the instantaneous maximum power of the reamer should not exceed the design power of the reamer, determine a reasonable construction parameter combination of the reamer transverse speed, reamer rotation speed, and reamer forward travel distance under the rock excavation intensity condition.

[0049] In the embodiment, the instantaneous maximum power P of the reamer under different reamer speed conditions and different reamer transverse speed conditions is max The reamer design power P should not be exceeded, i.e. according to P max ≤P, reversely determine the traverse speed V of the reamer under the rock excavation intensity condition h , reasonable construction parameter combination of reamer speed ω, and forward distance L.

[0050] In summary, the present invention provides a method for determining a reasonable combination of construction parameters for rock excavation by a dredging vessel, clarifies the relationship between auger structural parameters, rock characteristic parameters, construction process parameters and auger construction power, and solves the problem in the prior art that, when a dredging vessel is performing rock excavation construction, the construction parameters can only be roughly selected based on previous construction experience, and a relatively accurate estimation of the construction efficiency cannot be made; when the construction parameters are not selected reasonably, the construction efficiency of the dredging vessel may be easily reduced, or the auger drive motor may be overpowered, resulting in the motor fuse functioning, requiring shutdown to replace the fuse, and other problems. The method has positive significance for determining a reasonable combination of construction parameters during rock excavation construction by a dredging vessel, evaluating the rock excavation construction efficiency, accurately calculating the construction period and construction cost, and protecting the safety of the auger drive motor.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining a reasonable combination of construction parameters for rock excavation by a cutter suction vessel, characterized in that: include: Step S1, determining the number of reamer teeth, the designed cutting radius, the average width of the reamer cutting surface, and the longitudinal slope of the reamer cutting surface of the reamer, and assuming a reamer transverse speed and different reamer speed construction parameter ranges based on conventional construction experience; Step S2, according to the designed cutting radius of each reamer tooth and the assumed reamer traverse speed, the average cutting speed per unit time of each reamer tooth under different reamer rotation speed conditions is calculated by integration; Step S3, based on conventional construction experience, assuming different roughly appropriate reamer transverse movement speeds, and then calculating the average cutting thickness of the cutter teeth per unit time under different reamer rotation speed conditions and different reamer transverse movement speed conditions by integration; Step S4, according to the average width of the cutting surface of the cutter teeth, the longitudinal slope of the cutting surface of the cutter teeth, and the average cutting thickness of the cutter teeth, respectively calculate the average cutting area of ​​the cutter teeth under different reamer speed conditions and different reamer traverse speed conditions, and respectively calculate the corresponding average cutting force of the cutter teeth in combination with the compressive strength of the rock to be excavated; Step S5, calculating the average cutting power of each cutter tooth under different reamer rotation speed conditions and different reamer traverse speed conditions according to the average cutting speed and the average cutting force of each cutter tooth; Step S6, summing the average cutting power of each cutter tooth under the same reamer speed condition and the reamer traverse speed condition, obtaining the average cutting power of a single cutter arm of the reamer under different reamer speed conditions and different reamer traverse speed conditions, and calculating the instantaneous maximum power of the reamer; Step S7, based on the fact that the instantaneous maximum power of the reamer should not exceed the design power of the reamer, determine a reasonable construction parameter combination of the reamer transverse speed, reamer rotation speed, and reamer forward travel distance under the rock excavation intensity condition.

2. The method for determining a reasonable combination of construction parameters for rock excavation by a cutter suction vessel according to claim 1, characterized in that: In step S1, the number of teeth S of the reamer and the design cutting radius R of each tooth are determined according to the actual design of the rock reamer. S , the average width of the cutting surface of the cutter teeth B, the longitudinal slope of the cutting surface of the cutter teeth k, and based on conventional construction experience, assuming a reamer traverse speed V h And the reamer speed ω, the value range of the reamer speed ω is in an interval [ω1,ω2], that is, ω1≤ω≤ω2.

3. The method for determining a reasonable combination of construction parameters for rock excavation by a cutter suction vessel according to claim 2, characterized in that: In step S2, during the reamer rock excavation construction process, the reamer teeth are driven by the reamer arm to make a circular motion, and the instantaneous cutting speed V of each tooth is DS is the tangential speed of the cutter teeth rotating around the reamer ωR S and the traverse speed V of the reamer h The time t required for the reamer to rotate 180° is 总 is the unit time. According to the cosine theorem, the integration is used to calculate the time per tooth per unit time t under different reamer speed conditions. 总 Average cutting speed The calculation formula is as follows:

4. The method for determining a reasonable combination of construction parameters for rock excavation by a cutter suction vessel according to claim 3, characterized in that: In step S3, a reamer traverse speed range [V h1 ,V h2 ], that is, V h1 ≤V h ≤V h2 The cutting thickness of the cutter teeth is determined by the traverse speed V of the reamer. h Determined by the lateral velocity V perpendicular to the tooth trajectory hc According to the trigonometric function relationship, the average cutting thickness h of the cutter teeth per unit time under different reamer speed conditions and different reamer traverse speed conditions is calculated by integration. i , and its calculation formula is as follows:

5. The method for determining a reasonable combination of construction parameters for rock excavation by a cutter suction vessel according to claim 4, characterized in that: In step S4, the average width B of the cutting surface of the cutter teeth, the longitudinal slope k of the cutting surface of the cutter teeth, and the average cutting thickness h of the cutter teeth are used. i , respectively calculate the average cutting area of ​​the cutter teeth under different reamer speed conditions and different reamer traverse speed conditions Then, according to the compressive strength σ of the rock to be excavated, the corresponding average cutting force of the cutter teeth is calculated. The calculation formula is as follows:

6. A method for determining a reasonable combination of construction parameters for rock excavation by a cutter suction vessel according to claim 5, characterized in that: In step S5, according to the average cutting speed of each tooth Average cutting force of tooth Calculate the average cutting power of each cutter tooth under different reamer speed conditions and different reamer traverse speed conditions The calculation formula is as follows:

7. The method for determining a reasonable combination of construction parameters for rock excavation by a cutter suction vessel according to claim 6, characterized in that: In step S6, according to construction experience, under different forward displacement L conditions, the number of teeth N on each cutter arm involved in rock digging is different, and the average cutting power of each tooth involved in rock digging under the same reamer speed and reamer traverse speed conditions is calculated. The sum is calculated to obtain the average cutting power of a single cutter arm of the reamer under the same reamer speed and reamer traverse speed conditions. Considering the impact load multiple μ caused by the significant increase in instantaneous power in a short period of time when the reamer arm cuts into the hard rock, the reamer idling power P k And the number of blade arms M that cut into the hard rock layer at the same time when the reamer digs the rock, calculate the instantaneous maximum power P of the reamer max , and its calculation formula is as follows:

8. The method for determining a reasonable combination of construction parameters for rock excavation by a cutter suction vessel according to claim 7, characterized in that: In step S7, the instantaneous maximum power P of the reamer under different reamer rotation speed conditions and different reamer transverse speed conditions is max The reamer design power P should not be exceeded, i.e. according to P max ≤P, reversely determine the traverse speed V of the reamer under the rock excavation intensity condition h , reasonable construction parameter combination of reamer speed ω, and forward distance L.

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