Lifting type movable bridge emergency shutdown working condition impact effect checking method and system

Abstract

The invention relates to the technical field of bridge engineering, and provides a checking method and system which fit the structural characteristics of a lifting type movable bridge, consider the multi-factor coupling effect and are accurate in calculation aiming at the problems that a calculation model is excessively simplified and actual working condition parameters are not combined with the structural characteristics of the lifting type movable bridge and the like in an existing checking method. The method comprises the following steps of: calculating total equivalent rotational inertia and total equivalent translational mass of all parts including a motor, a speed reducer, a working brake, a winding drum, a bridge body and a balancing weight; according to the performance parameters of the safety brake and the working brake, the winding drum side safety braking translation acceleration, the winding drum side working braking translation acceleration and the unbalanced load translation acceleration are calculated; calculating an impact load coefficient of the system; on the basis, the stroke safety of the bridge body and the strength and skid resistance of the steel wire rope are checked. According to the method, the accurate checking method adaptive to the impact effect of the lifting type movable bridge under the emergency shutdown working condition is realized, and a scientific basis is provided for design, debugging test and safe operation of the movable bridge.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, specifically to a method and system for verifying the impact effect of an emergency shutdown condition on a lifting-type opening bridge. Background Technology

[0002] Lift-type opening bridges, with their compact structure and high lifting efficiency, are widely used in urban waterways, ports, and other scenarios requiring both navigation and passage. These bridges use counterweights to offset part of the bridge's weight, reducing the load on the drive system. However, in actual operation, sudden power outages or equipment failures may trigger emergency stops. In such cases, the braking system responds quickly, and the bridge structure experiences impact loads under the combined effects of inertia, unbalanced loads, and braking forces.

[0003] The magnitude of impact loads directly affects the service life of critical components such as the lifting bridge structure, wire ropes, main hoisting system, braking system, and counterweight system, and may even cause safety hazards such as structural deformation and wire rope slippage. Currently, existing impact load calculations for ordinary cranes do not fully consider the structural characteristics of lifting bridges—the counterweight only offsets part of the bridge's weight, the impact of unbalanced loads is more significant during emergency stops, and the response delay of the braking system and the mechanical characteristics of the coordinated action of multiple brakes have not been accurately quantified. Furthermore, existing methods suffer from overly simplified calculation models and failure to incorporate actual operating parameters (such as brake response time and transmission efficiency), resulting in significant deviations between calculated results and actual impact loads, making it difficult to effectively guide the design and safety assessment of lifting bridges.

[0004] Therefore, there is an urgent need for a method to calculate the impact load under emergency shutdown conditions that is tailored to the structural characteristics of lifting-type opening bridges, considers the coupling effect of multiple factors, and is accurate, so as to overcome the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a method and system for verifying the impact effect of a lifting-type opening bridge under emergency shutdown conditions. This method fully considers the mechanical characteristics of the lifting-type opening bridge structure, the response characteristics of the braking system, and the coupling effect of multiple factors, so as to achieve accurate calculation of impact load and provide a scientific basis for the structural design, commissioning test and safe operation of the opening bridge.

[0006] A method for verifying the impact effect of an emergency stop of a lifting-type opening bridge includes the following steps:

[0007] Based on the operating characteristics of the lifting-type opening bridge, the total equivalent moment of inertia J, including the motor, reducer, working brake, drum, bridge body, and counterweight, is calculated. t Total equivalent translational mass m t ;

[0008] Based on the performance parameters of the safety brake and the service brake, the total equivalent moment of inertia J t Total equivalent translational mass m t Calculate the translational acceleration α of the safety brake on the drum side when the safety brake is applied under emergency stop conditions. s When the working brake is applied, the translational acceleration α on the drum side is... w and translational acceleration α of unbalanced load u ;

[0009] Based on the translational acceleration α of the safety braking on the drum side s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Combined with the dynamic load factor φ d Calculate the impact load factor K of the system. d ;

[0010] Based on the operating speed v0, brake response time t0, and drum-side safety braking translational acceleration α during the emergency stop condition of the opening bridge. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Verify whether the bridge structure meets the travel safety requirements from emergency stop to complete stop;

[0011] Based on the system's impact load coefficient K d Bridge weight (m) q counterweight weight m p The number of lifting steel wire ropes n for the bridge body q The number of counterweight lifting wire ropes n p Breaking tensile force T of steel wire rope s Safety factor k of wire rope s Translational acceleration α of the safety brake on the drum side s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Verify whether the strength of the steel wire rope under impact load meets the requirements;

[0012] Based on the system's impact load coefficient K d Bridge weight (m) q counterweight weight m p The number of turns of the wire rope on the drum, n1; the coefficient of friction between the wire rope and the drum, μ1; and the translational acceleration α of the safety braking on the drum side. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Check whether there is slippage between the wire rope and the balance friction drum.

[0013] Furthermore, based on the operating characteristics of the lifting-type opening bridge, the total equivalent moment of inertia J, including the motor, reducer, working brake, drum, bridge body, and counterweight, is calculated. t Total equivalent translational mass m t Specifically, it includes: the total equivalent moment of inertia J t The total equivalent translational mass m is calculated according to formula (1). t Calculate according to formula (2):

[0014] (1);

[0015] (2);

[0016] In the formula, J t m is the total equivalent moment of inertia. t n is the total equivalent translational mass; j m is the number of rolls. j For the mass of the roll; r j The nominal radius of the roll; m q The weight of the bridge structure; m p To counterbalance the weight; f d n is the conversion factor for the reducer and working brake, taken as 1.2; d η represents the number of motors. d J represents the efficiency of the electric motor. d is the moment of inertia of the electric motor; i is the transmission ratio.

[0017] Furthermore, based on the performance parameters of the safety brake and the working brake, and the total equivalent moment of inertia J... t Total equivalent translational mass m t Calculate the translational acceleration α of the safety brake on the drum side when the safety brake is applied under emergency stop conditions. s When the working brake is applied, the translational acceleration α on the drum side is... w and translational acceleration α of unbalanced load u Specifically, this includes: the translational acceleration α of the safety braking on the drum side. s The translational acceleration α of the working brake on the drum side is calculated according to formula (3). w The translational acceleration α of the unbalanced load is calculated according to equation (4). u Calculate according to formula (5):

[0018] (3);

[0019] (4);

[0020] (5);

[0021] In the formula, α s α is the translational acceleration for safety braking on the drum side. w α is the translational acceleration of the working brake on the drum side. u For the translational acceleration of the unbalanced load; F s For the clamping force of a single safety brake head; μ s n is the coefficient of friction between the brake head and the brake disc. s η is the number of pairs of brake heads; s For the efficiency of the safety brake; r s r is the braking radius; j J is the nominal radius of the drum; t M is the total equivalent moment of inertia; w The braking torque of a single working brake; η w The efficiency of the working brake; n w The number of working brakes; i is the transmission ratio; m q The weight of the bridge structure; m p To balance the weight; g is the acceleration due to gravity; m t The total equivalent translational mass.

[0022] Furthermore, based on the translational acceleration α of the safety braking on the drum side... s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Combined with the dynamic load factor φ d Calculate the impact load factor K of the system. d Specifically, this includes: the impact load factor K of the system. d Calculate according to formula (6):

[0023] (6);

[0024] In the formula, K d α is the impact load factor of the system. u α is the translational acceleration of the unbalanced load; s α is the translational acceleration for safety braking on the drum side. w g is the translational acceleration during working braking on the drum side; φ is the acceleration due to gravity; d The dynamic load factor for emergency stop, unexpected stop, and non-continuous braking is set to 3.

[0025] Furthermore, based on the operating speed v0 of the bridge under emergency stop conditions, the response time t0 of the brake activation, and the translational acceleration α of the safety brake on the drum side... s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load uVerify whether the bridge body meets the travel safety requirements from emergency stop to complete stop, specifically including: the travel distance from emergency stop to complete stop of the bridge body should meet the requirements of equation (7):

[0026] (7);

[0027] In the formula, v0 is the operating speed of the bridge during emergency stop; t0 is the response time of the brake activation; α u α is the translational acceleration of the unbalanced load; s α is the translational acceleration for safety braking on the drum side. w [s] represents the translational acceleration of the working brake on the drum side; [s] represents the distance from the lower limit position of the bridge body to the buffer lock.

[0028] Furthermore, based on the system's impact load factor K d Bridge weight (m) q counterweight weight m p The number of lifting steel wire ropes n for the bridge body q The number of counterweight lifting wire ropes n p Breaking tensile force T of steel wire rope s Safety factor k of wire rope s Translational acceleration α of the safety brake on the drum side s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u The strength of the wire rope under impact load is checked to ensure it meets the requirements. Specifically, the maximum tension of the wire rope under impact load should meet the requirements of equation (8).

[0029] (8);

[0030] In the formula, T max The maximum tension of the wire rope; m q The weight of the bridge structure; m p To balance the weight; K d α is the impact load factor of the system. u α is the translational acceleration of the unbalanced load; s α is the translational acceleration for safety braking on the drum side. w g is the translational acceleration during working braking on the drum side; g is the acceleration due to gravity; n q n is the number of lifting wire ropes for the bridge structure. p The number of lifting wire ropes for counterweight; T s The breaking strength of the wire rope; k s The safety factor for the wire rope is set to 8.

[0031] Furthermore, based on the system's impact load factor K dBridge weight (m) q counterweight weight m p The number of turns of the wire rope on the drum, n1; the coefficient of friction between the wire rope and the drum, μ1; and the translational acceleration α of the safety braking on the drum side. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u To check whether there is slippage between the wire rope and the balance friction drum, specifically: when equation (9) is true, there is no slippage between the wire rope and the balance friction drum.

[0032] (9);

[0033] In the formula, m q The weight of the bridge structure; m p To balance the weight; g is the acceleration due to gravity; n1 is the number of turns of the wire rope on the drum; μ1 is the coefficient of friction between the wire rope and the drum, taken as 0.08; K d α is the impact load factor of the system. u α is the translational acceleration of the unbalanced load; s α is the translational acceleration for safety braking on the drum side. w This refers to the translational acceleration of the working brake on the drum side.

[0034] Furthermore, a flowchart of a method and system for verifying the impact effect of an emergency stop of a lifting-type opening bridge includes:

[0035] The module for calculating the total equivalent moment of inertia and total equivalent translational mass is used to calculate the total equivalent moment of inertia J, including the motor, reducer, working brake, drum, bridge body, and counterweight, based on the operating characteristics of the lifting-type opening bridge. t Total equivalent translational mass m t ;

[0036] The translational acceleration calculation module is used to calculate the total equivalent moment of inertia J based on the performance parameters of the safety brake and the working brake. t Total equivalent translational mass m t Calculate the translational acceleration α of the safety brake on the drum side when the safety brake is applied under emergency stop conditions. s When the working brake is applied, the translational acceleration α on the drum side is... w and translational acceleration α of unbalanced load u ;

[0037] The impact load factor calculation module is used to calculate the translational acceleration α of the safety braking on the drum side. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Combined with the dynamic load factor φd Calculate the impact load factor K of the system. d ;

[0038] The bridge travel safety verification module is used to verify the operating speed v0, brake activation response time t0, and drum-side safety braking translational acceleration α during emergency stop of the bridge. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Verify whether the bridge structure meets the travel safety requirements from emergency stop to complete stop;

[0039] The wire rope strength verification module is used to verify the impact load coefficient K of the system. d Bridge weight (m) q counterweight weight m p The number of lifting steel wire ropes n for the bridge body q The number of counterweight lifting wire ropes n p Breaking tensile force T of steel wire rope s Safety factor k of wire rope s Translational acceleration α of the safety brake on the drum side s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Verify whether the strength of the steel wire rope under impact load meets the requirements;

[0040] The wire rope anti-slip verification module is used to verify the impact load coefficient K of the system. d Bridge weight (m) q counterweight weight m p The number of turns of the wire rope on the drum, n1; the coefficient of friction between the wire rope and the drum, μ1; and the translational acceleration α of the safety braking on the drum side. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Check whether there is slippage between the wire rope and the balance friction drum.

[0041] The present invention has the following beneficial effects:

[0042] 1) By introducing correction parameters such as conversion factor and dynamic load factor, and combining them with the precise formulas of equivalent moment of inertia and equivalent translational mass, the calculation of key indicators such as braking acceleration and the influence of unbalanced loads is made more in line with the actual engineering scenario, avoiding the errors caused by simplified calculation.

[0043] 2) It not only verified the safety of the bridge's buffer stroke, but also checked the bridge's operation from multiple dimensions, including component strength and transmission stability, through indicators such as dynamic load coefficient, wire rope tension, and Euler resistance. This effectively prevented potential hazards such as impact damage and wire rope slippage during emergency shutdowns.

[0044] 3) The method is applicable to typical working conditions of partially balanced lifting opening bridges. The steps are clear and the formulas are well-defined, making it easy for engineers to apply directly. It can efficiently guide the design and safety assessment of emergency braking systems for such bridges, and improve the reliability and safety of equipment operation. Attached Figure Description

[0045] Figure 1 This is an elevation layout diagram of a partially balanced lifting type opening bridge according to an embodiment of the present invention;

[0046] Figure 2 This is a plan view of a single main hoisting system according to an embodiment of the present invention;

[0047] Figure 3 This is a flowchart of the impact verification method for the emergency shutdown condition of the lifting-type opening bridge according to an embodiment of the present invention. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Please see Figure 3 This invention provides a method for verifying the impact effect of an emergency stop of a lifting-type opening bridge, comprising the following steps:

[0050] Step 1: Based on the operating characteristics of the lifting-type opening bridge, including, etc. Figure 1 and Figure 2 The total equivalent moment of inertia J of the motor, reducer, working brake, drum, bridge body and counterweight shown is... t The total equivalent translational mass m is calculated according to formula (1). t Calculate according to formula (2):

[0051] (1);

[0052] (2);

[0053] In the formula, J t m is the total equivalent moment of inertia.t n is the total equivalent translational mass; j m is the number of rolls. j For the mass of the roll; r j The nominal radius of the roll; m q The weight of the bridge structure; m p To counterbalance the weight; f d n is the conversion factor for the reducer and working brake, taken as 1.2; d η represents the number of motors. d J represents the efficiency of the electric motor. d is the moment of inertia of the electric motor; i is the transmission ratio.

[0054] Step 2: Based on the performance parameters of the safety brake and the service brake, and the total equivalent moment of inertia J t Total equivalent translational mass m t In emergency stop conditions, the translational acceleration α of the safety brake on the drum side during braking is calculated according to formula (3). s The translational acceleration α of the working brake on the drum side during braking is calculated according to formula (4). w The translational acceleration α of the unbalanced load is calculated according to equation (5). u :

[0055] (3);

[0056] (4);

[0057] (5);

[0058] In the formula, α s α is the translational acceleration for safety braking on the drum side. w α is the translational acceleration of the working brake on the drum side. u For the translational acceleration of the unbalanced load; F s For the clamping force of a single safety brake head; μ s n is the coefficient of friction between the brake head and the brake disc. s η is the number of pairs of brake heads; s For the efficiency of the safety brake; r s r is the braking radius; j J is the nominal radius of the drum; t M is the total equivalent moment of inertia; w The braking torque of a single working brake; η w The efficiency of the working brake; n w The number of working brakes; i is the transmission ratio; m q The weight of the bridge structure; m p To balance the weight; g is the acceleration due to gravity; m tThe total equivalent translational mass.

[0059] Step 3: Based on the translational acceleration α of the safety brake on the drum side s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Combined with the dynamic load factor φ d The impact load coefficient K of the calculation system is calculated according to formula (6). d :

[0060] (6);

[0061] In the formula, K d α is the impact load factor of the system. u α is the translational acceleration of the unbalanced load; s α is the translational acceleration for safety braking on the drum side. w g is the translational acceleration during working braking on the drum side; φ is the acceleration due to gravity; d The dynamic load factor for emergency stop, unexpected stop, and non-continuous braking is set to 3.

[0062] Step 4: Based on the operating speed v0, brake response time t0, and drum-side safety braking translational acceleration α during the emergency stop condition of the opening bridge. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u According to formula (7), check whether the bridge body meets the travel safety requirements from emergency stop to complete stop:

[0063] (7);

[0064] In the formula, v0 is the operating speed of the bridge during emergency stop; t0 is the response time of the brake activation; α u α is the translational acceleration of the unbalanced load; s α is the translational acceleration for safety braking on the drum side. w [s] represents the translational acceleration of the working brake on the drum side; [s] represents the distance from the lower limit position of the bridge body to the buffer lock.

[0065] Step 5: Based on the system's impact load coefficient K d Bridge weight (m) q counterweight weight m p The number of lifting steel wire ropes n for the bridge body q The number of counterweight lifting wire ropes n p Breaking tensile force T of steel wire rope s Safety factor k of wire rope s Translational acceleration α of the safety brake on the drum side sTranslational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Check whether the strength of the wire rope under impact load meets the requirements according to formula (8):

[0066] (8);

[0067] In the formula, T max The maximum tension of the wire rope; m q The weight of the bridge structure; m p To balance the weight; K d α is the impact load factor of the system. u α is the translational acceleration of the unbalanced load; s α is the translational acceleration for safety braking on the drum side. w g is the translational acceleration during working braking on the drum side; g is the acceleration due to gravity; n q n is the number of lifting wire ropes for the bridge structure. p The number of lifting wire ropes for counterweight; T s The breaking strength of the wire rope; k s The safety factor for the wire rope is set to 8.

[0068] Step 6: Based on the system's impact load coefficient K d Bridge weight (m) q counterweight weight m p The number of turns of the wire rope on the drum, n1; the coefficient of friction between the wire rope and the drum, μ1; and the translational acceleration α of the safety braking on the drum side. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Check whether there is slippage between the wire rope and the balance friction drum according to formula (9):

[0069] (9);

[0070] In the formula, m q The weight of the bridge structure; m p To balance the weight; g is the acceleration due to gravity; n1 is the number of turns of the wire rope on the drum; μ1 is the coefficient of friction between the wire rope and the drum, taken as 0.08; K d α is the impact load factor of the system. u α is the translational acceleration of the unbalanced load; s α is the translational acceleration for safety braking on the drum side. w This refers to the translational acceleration of the working brake on the drum side.

[0071] This invention also provides a system for verifying the impact effect of an emergency stop operation of a lifting-type opening bridge, comprising:

[0072] The module for calculating the total equivalent moment of inertia and total equivalent translational mass is used to calculate the total equivalent moment of inertia J, including the motor, reducer, working brake, drum, bridge body, and counterweight, based on the operating characteristics of the lifting-type opening bridge. t Total equivalent translational mass m t ;

[0073] The translational acceleration calculation module is used to calculate the total equivalent moment of inertia J based on the performance parameters of the safety brake and the working brake. t Total equivalent translational mass m t Calculate the translational acceleration α of the safety brake on the drum side when the safety brake is applied under emergency stop conditions. s When the working brake is applied, the translational acceleration α on the drum side is... w and translational acceleration α of unbalanced load u ;

[0074] The impact load factor calculation module is used to calculate the translational acceleration α of the safety braking on the drum side. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Combined with the dynamic load factor φ d Calculate the impact load factor K of the system. d ;

[0075] The bridge travel safety verification module is used to verify the operating speed v0, brake activation response time t0, and drum-side safety braking translational acceleration α during emergency stop of the bridge. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Verify whether the bridge structure meets the travel safety requirements from emergency stop to complete stop;

[0076] The wire rope strength verification module is used to verify the impact load coefficient K of the system. d Bridge weight (m) q counterweight weight m p The number of lifting steel wire ropes n for the bridge body q The number of counterweight lifting wire ropes n p Breaking tensile force T of steel wire rope s Safety factor k of wire rope s Translational acceleration α of the safety brake on the drum side s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Verify whether the strength of the steel wire rope under impact load meets the requirements;

[0077] The wire rope anti-slip verification module is used to verify the impact load coefficient K of the system. d Bridge weight (m) q counterweight weight m p The number of turns of the wire rope on the drum, n1; the coefficient of friction between the wire rope and the drum, μ1; and the translational acceleration α of the safety braking on the drum side. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Check whether there is slippage between the wire rope and the balance friction drum.

[0078] The technical solution of the present invention will be illustrated below with a specific example (a certain opening bridge).

[0079] A certain opening bridge adopts a partially balanced vertical lifting system. The bridge spans 104m, is 31m wide, weighs approximately 2650t, and has a counterweight of approximately 2560t. According to the overall design requirements, the bridge needs to be lifted vertically 27m when opening, with both opening and closing times of 9 minutes. There are four lifting mechanisms, each consisting of two friction drum assemblies, two AC variable frequency motors (one as a spare), one double-shaft reducer, two open gear systems, two safety brakes (with hydraulic power units), and two working brakes. Each drum assembly suspends 11 steel wire ropes, one end of which is connected to the bridge structure, and the other end to a counterweight. One end of each drum assembly has a pair of open gears that transmit the motor drive torque. The other end of each drum assembly has a brake disc, and each drum assembly has two pairs of hydraulic disc safety brakes, with the brake heads mounted on the brake arms for parking braking after the lifting machine stops. One set of hydraulic drum brakes is installed on each of the high-speed shafts on both sides of the reducer. The main calculation parameters are shown in Table 1.

[0080] Table 1 Main Calculation Parameters

[0081]

[0082] (1) Calculated according to equations (1) to (2):

[0083] Equivalent moment of inertia: J t =78,182,954 kg·m 2

[0084] Equivalent translational mass: m t =25529t

[0085] (2) Calculate the acceleration according to equations (3) to (5):

[0086] Safety braking translational acceleration: α s =0.196m / s 2

[0087] Translational acceleration during braking: α w =0.277m / s 2

[0088] Translational acceleration of unbalanced load: α u =0.035m / s 2

[0089] (3) According to formula (6), the following can be calculated:

[0090] System impact load factor: K d =1.134

[0091] (4) According to formula (7), the following can be calculated:

[0092] The left side of the inequality is 0.027m; the right side of the inequality is 0.2m, which satisfies the inequality requirement, indicating that the bridge body meets the travel safety requirements from emergency stop to complete stop.

[0093] (5) According to formula (8), the following can be calculated:

[0094] The left side of the inequality is 310kN; the right side of the inequality is 331.3kN, which satisfies the inequality requirement, indicating that the strength of the wire rope meets the requirements.

[0095] (6) According to formula (9), the following can be calculated:

[0096] The left side of the inequality is 5579kN; the right side of the inequality is 3470kN, which satisfies the inequality requirement, indicating that the wire rope will not slip.

[0097] The present invention has the following beneficial effects:

[0098] 1) By introducing correction parameters such as conversion factor and dynamic load factor, and combining them with the precise formulas of equivalent moment of inertia and equivalent translational mass, the calculation of key indicators such as braking acceleration and the influence of unbalanced loads is made more in line with the actual engineering scenario, avoiding the errors caused by simplified calculation.

[0099] 2) It not only verified the safety of the bridge's buffer stroke, but also checked the bridge's operation from multiple dimensions, including component strength and transmission stability, through indicators such as dynamic load coefficient, wire rope tension, and Euler resistance. This effectively prevented potential hazards such as impact damage and wire rope slippage during emergency shutdowns.

[0100] 3) The method is applicable to typical working conditions of partially balanced lifting opening bridges. The steps are clear and the formulas are well-defined, making it easy for engineers to apply directly. It can efficiently guide the design and safety assessment of emergency braking systems for such bridges, and improve the reliability and safety of equipment operation.

[0101] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for verifying the impact effect of a lifting-type opening bridge under emergency stop conditions, characterized in that: Includes the following steps: Based on the operating characteristics of the lifting-type opening bridge, the total equivalent moment of inertia J, including the motor, reducer, working brake, drum, bridge body, and counterweight, is calculated. t Total equivalent translational mass m t ; Based on the performance parameters of the safety brake and the service brake, the total equivalent moment of inertia J t Total equivalent translational mass m t Calculate the translational acceleration α of the safety brake on the drum side when the safety brake is applied under emergency stop conditions. s When the working brake is applied, the translational acceleration α on the drum side is... w and translational acceleration α of unbalanced load u ; Based on the translational acceleration α of the safety braking on the drum side s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Combined with the dynamic load factor φ d Calculate the impact load factor K of the system. d ; Based on the operating speed v0, brake response time t0, and drum-side safety braking translational acceleration α during the emergency stop condition of the opening bridge. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Verify whether the bridge structure meets the travel safety requirements from emergency stop to complete stop; Based on the system's impact load coefficient K d Bridge weight (m) q counterweight weight m p The number of lifting steel wire ropes n for the bridge body q The number of counterweight lifting wire ropes n p Breaking tensile force T of steel wire rope s Safety factor k of wire rope s Translational acceleration α of the safety brake on the drum side s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Verify whether the strength of the steel wire rope under impact load meets the requirements; Based on the system's impact load coefficient K d Bridge weight (m) q counterweight weight m p The number of turns of the wire rope on the drum, n1; the coefficient of friction between the wire rope and the drum, μ1; and the translational acceleration α of the safety braking on the drum side. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Check whether there is slippage between the wire rope and the balance friction drum.

2. The method as described in claim 1, characterized in that, Based on the operating characteristics of the lifting-type opening bridge, the total equivalent moment of inertia J, including the motor, reducer, working brake, drum, bridge body, and counterweight, is calculated. t Total equivalent translational mass m t Specifically, it includes: the total equivalent moment of inertia J t The total equivalent translational mass m is calculated according to formula (1). t Calculate according to formula (2): （1）； （2）； In the formula, J t The total equivalent moment of inertia; m t n is the total equivalent translational mass; j Number of rolls; m j For the mass of the roll; r j The nominal radius of the roll; m q The weight of the bridge structure; m p To counterbalance the weight; f d n is the conversion factor for the reducer and working brake, taken as 1.2; d η represents the number of motors. d J represents the efficiency of the electric motor. d is the moment of inertia of the electric motor; i is the transmission ratio.

3. The method as described in claim 1, characterized in that, Based on the performance parameters of the safety brake and the service brake, the total equivalent moment of inertia J t Total equivalent translational mass m t Calculate the translational acceleration α of the safety brake on the drum side when the safety brake is applied under emergency stop conditions. s When the working brake is applied, the translational acceleration α on the drum side is... w and translational acceleration α of unbalanced load u Specifically, this includes: the translational acceleration α of the safety braking on the drum side. s The translational acceleration α of the working brake on the drum side is calculated according to formula (3). w The translational acceleration α of the unbalanced load is calculated according to equation (4). u Calculate according to formula (5): （3）； （4）； （5）； In the formula, α s The translational acceleration for safety braking on the drum side; α w The translational acceleration of the drum-side working brake; α u For the translational acceleration of the unbalanced load; F s For the clamping force of a single safety brake head; μ s n is the coefficient of friction between the brake head and the brake disc. s η is the number of pairs of brake heads; s For the efficiency of the safety brake; r s r is the braking radius; j J is the nominal radius of the drum; t M is the total equivalent moment of inertia; w The braking torque of a single working brake; η w The efficiency of the working brake; n w The number of working brakes; i is the transmission ratio; m q The weight of the bridge structure; m p To balance the weight; g is the acceleration due to gravity; m t The total equivalent translational mass.

4. The method as described in claim 1, characterized in that, Based on the translational acceleration α of the safety braking on the drum side s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Combined with the dynamic load factor φ d Calculate the impact load factor K of the system. d Specifically, this includes: the impact load factor K of the system. d Calculate according to formula (6): （6）； In the formula, K d α is the impact load factor of the system. u For the translational acceleration of the unbalanced load; α s The translational acceleration for safety braking on the drum side; α w g is the translational acceleration during working braking on the drum side; φ is the acceleration due to gravity; d The dynamic load factor for emergency stop, unexpected stop, and non-continuous braking is set to 3.

5. The method as described in claim 1, characterized in that, Based on the operating speed v0, brake response time t0, and drum-side safety braking translational acceleration α during the emergency stop condition of the opening bridge. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Verify whether the bridge body meets the travel safety requirements from emergency stop to complete stop, specifically including: the travel distance from emergency stop to complete stop should meet the requirements of equation (7): （7）； In the formula, v0 is the operating speed of the bridge during emergency stop; t0 is the response time of the brake activation; α u For the translational acceleration of the unbalanced load; α s The translational acceleration for safety braking on the drum side; α w [s] represents the translational acceleration of the working brake on the drum side; [s] represents the distance from the lower limit position of the bridge body to the buffer lock.

6. The method as described in claim 1, characterized in that, Based on the system's impact load coefficient K d Bridge weight (m) q counterweight weight m p The number of lifting steel wire ropes n for the bridge body q The number of counterweight lifting wire ropes n p Breaking tensile force T of steel wire rope s Safety factor k of wire rope s Translational acceleration α of the safety brake on the drum side s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u The strength of the wire rope under impact load is checked to ensure it meets the requirements. Specifically, the maximum tension of the wire rope under impact load should meet the requirements of equation (8). （8）； In the formula, T max The maximum tension of the wire rope; m q The weight of the bridge structure; m p To balance the weight; K d α is the impact load factor of the system. u For the translational acceleration of the unbalanced load; α s The translational acceleration for safety braking on the drum side; α w g is the translational acceleration during working braking on the drum side; g is the acceleration due to gravity; n q n is the number of lifting wire ropes for the bridge structure. p The number of lifting wire ropes for counterweight; T s The breaking tensile force of the wire rope; k s The safety factor for the wire rope is set to 8.

7. The method as described in claim 1, characterized in that, Based on the system's impact load coefficient K d Bridge weight (m) q counterweight weight m p The number of turns of the wire rope on the drum, n1; the coefficient of friction between the wire rope and the drum, μ1; and the translational acceleration α of the safety braking on the drum side. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u To check whether there is slippage between the wire rope and the balance friction drum, specifically: when equation (9) is true, there is no slippage between the wire rope and the balance friction drum. （9）； In the formula, m q The weight of the bridge structure; m p To balance the weight; g is the acceleration due to gravity; n1 is the number of turns of the wire rope on the drum; μ1 is the coefficient of friction between the wire rope and the drum, taken as 0.08; K d α is the impact load factor of the system. u For the translational acceleration of the unbalanced load; α s The translational acceleration for safety braking on the drum side; α w This refers to the translational acceleration of the working brake on the drum side.

8. A system for verifying the impact effect of an emergency stop operation of a lifting-type opening bridge, used to execute the method according to any one of claims 1-7, characterized in that, include: The module for calculating the total equivalent moment of inertia and total equivalent translational mass is used to calculate the total equivalent moment of inertia J, including the motor, reducer, working brake, drum, bridge body, and counterweight, based on the operating characteristics of the lifting-type opening bridge. t Total equivalent translational mass m t ; The translational acceleration calculation module is used to calculate the total equivalent moment of inertia J based on the performance parameters of the safety brake and the working brake. t Total equivalent translational mass m t Calculate the translational acceleration α of the safety brake on the drum side when the safety brake is applied under emergency stop conditions. s When the working brake is applied, the translational acceleration α on the drum side is... w and translational acceleration α of unbalanced load u ; The impact load factor calculation module is used to calculate the translational acceleration α of the safety braking on the drum side. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Combined with the dynamic load factor φ d Calculate the impact load factor K of the system. d ; The bridge travel safety verification module is used to verify the operating speed v0, brake activation response time t0, and drum-side safety braking translational acceleration α during emergency stop of the bridge. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Verify whether the bridge structure meets the travel safety requirements from emergency stop to complete stop; The wire rope strength verification module is used to verify the impact load coefficient K of the system. d Bridge weight (m) q counterweight weight m p The number of lifting steel wire ropes n for the bridge body q The number of counterweight lifting wire ropes n p Breaking tensile force T of steel wire rope s Safety factor k of wire rope s Translational acceleration α of the safety brake on the drum side s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Verify whether the strength of the steel wire rope under impact load meets the requirements; The wire rope anti-slip verification module is used to verify the impact load coefficient K of the system. d Bridge weight (m) q counterweight weight m p The number of turns of the wire rope on the drum, n1; the coefficient of friction between the wire rope and the drum, μ1; and the translational acceleration α of the safety braking on the drum side. s Translational acceleration α of the drum side working brake w and translational acceleration α of unbalanced load u Check whether there is slippage between the wire rope and the balance friction drum.

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