A method for compensating for the diameter expansion of a winding drum of a wedge-link slider

Abstract

This invention relates to a method for compensating the expansion diameter of a wedge-connector slider drum. The method includes the following steps: Step 1: First, the maximum diameter, minimum diameter (of a perfect circle), and corresponding dimensions of the cylinder are required for the drum design. Step 2: The fixed distance from the center of the lower pin of the connecting rod to the mandrel is A, and the fixed distance from the center of the upper pin of the connecting rod to the highest point of the sector plate is B. The stroke of the expansion cylinder is defined as the projection of the connecting rod in the horizontal direction, and the distance between the mandrel and the sector plate is F. The maximum expansion diameter of the drum is F1, and the minimum expansion diameter is F2. Step 3: The angle between the connecting rod and the mandrel at the minimum expansion diameter is calculated using the design dimensions and set as α. The angle between the connecting rod and the mandrel at the maximum expansion diameter is β. Step 4: After the drum is removed from the machine, a full-machine measurement or disassembly measurement is performed. Step 5: The required dimensional data for restoring accuracy are obtained through Step 4. Accurate calculations can effectively improve the maximum and minimum expansion diameter of the drum and the accuracy of its correspondence with the cylinder stroke.

Description

Technical Field

[0001] This invention relates to a compensation method, specifically a method for compensating the expansion diameter of a slider drum in a wedge connecting rod, belonging to the field of mechanical maintenance technology. Background Technology

[0002] Hot-rolled coils generally employ a connecting rod, wedge, and slider structure. The coil is primarily composed of components such as a sector plate, hollow shaft, mandrel, connecting rod, and wedge. The expansion and contraction of the coil are mainly achieved by an expansion and contraction cylinder pushing and pulling the mandrel. The mandrel and sector plate are connected by a connecting rod and a pin. The slider slides on the wedge of the mandrel. The mandrel's forward and backward movement pulls the connecting rod along an arc trajectory. The change in the angle between the connecting rod and the mandrel causes a change in the diameter of the sector plate, transforming axial movement into radial movement. When the mandrel is pushed to its foremost position, the coil has its minimum diameter; when pulled back, it has its maximum diameter; and in the middle position, it is a perfect circle. However, the expansion diameter and the expansion and contraction cylinder position are not linearly related. Therefore, calibration uses three positions—maximum, minimum, and perfect circle—for positioning interpolation calculations and control. The relationship between these three positions directly affects the coil's accuracy and normal operation. The correspondence between the three expansion diameters and the expansion and contraction cylinder positions can be verified by measuring the distance between the end faces of the mandrel and the hollow shaft.

[0003] The coiling drum is the core equipment in the coiling area of ​​the hot rolling production line. Its function is to coil the strip steel conveyed from the pinch rolls into a circle. When the steel is waiting, the coiling drum is in a pre-expansion (perfect circle) state. After the strip steel head passes through the pinch rolls and transition plate, it enters the gap between the coiling drum's fan-shaped plate and the coiling aid roll to bend and form. The head first contacts the fan-shaped plate of the coiling drum. After coiling 3 to 5 turns, the coiling drum moves to its maximum expansion diameter until the coiling operation is completed. After the strip steel is coiled, the coiling drum moves to its minimum expansion diameter. A gap is formed between the coiling drum's fan-shaped plate and the inner circle of the steel coil to ensure that the unloading trolley transports the steel coil to the bundling table and the high-speed chain.

[0004] The expansion diameter of the drum plays a decisive role in the entire winding function, so the requirements for the expansion diameter size are extremely high. When the maximum expansion diameter deviation is large, it may cause the unwinding to slip, and the steel coil may not be able to be unloaded smoothly. The steel coil may fall and damage the equipment in the unwinding trolley, external support and other areas. When the minimum diameter deviation is large, it may cause the steel coil to get stuck on the drum and be unable to be unloaded. When there is a deviation in the perfect circle, it is easy to cause the strip steel to fail to bite into the scrap steel.

[0005] After frequent contact and friction between the center and the head of the sector plate, uneven wear is inevitable. The wear is most severe in the middle of the sector plate, while the sides, with less contact, show almost no wear. To ensure the four approximately arc-shaped sector plates form a perfect circle and allow the strip head to bend smoothly, the fatigue layer of the sector plate needs to be machined each time, resulting in a common reduction in diameter. Reducing the thickness of the sector plate decreases the expansion diameter, making it impossible to meet the expansion diameter accuracy requirements, which can easily lead to unloading problems from the drum. Manufacturers generally recommend scrapping the sector plates, but the cost of each set is high (300,000-400,000 RMB). If the sector plates are not replaced, one or two of the three parameters—maximum, minimum, and cylinder stroke—can be sacrificed, disrupting the correspondence between the expansion diameter and cylinder stroke. This requires readjusting the expansion diameter after each drum operation (due to the long adjustment time, a 10-15 day maintenance cycle is needed). During the period when the expansion diameter is not adjusted, the drum must be used at the risk of sacrificing coil quality or experiencing unloading slippage and machine stoppage.

[0006] A review of relevant patents reveals that Chinese patent "A Method for Remanufacturing Large Rollers" primarily focuses on the measurement and remanufacturing of scrapped rollers, using methods to repair rollers through measurement. Chinese patent "A Method for Repairing the Pyramidal Shaft of a Cold Rolling Coiler Roller" mainly addresses the repair of the roller mandrel. Chinese patent "A Cooling System for a Hot Rolling Coiler Roller" primarily solves the problem of high roller temperature, thereby extending the roller's service life. Chinese patent "A Method for Improving the Machining Accuracy of a Tension Coiler Roller" mainly focuses on ensuring the machining accuracy of mandrels and hollow shafts. Chinese patent "A Method for Dynamically Judging Abnormalities in the Accuracy of a Coiler Roller" mainly uses a program to judge the usage status of the roller's accuracy. Currently, there is no calculation model or method for restoring the diameter expansion accuracy of rollers. Summary of the Invention

[0007] This invention addresses the problems existing in the prior art by providing a method for compensating the expansion diameter of a drum using a wedge-connector slider. This technical solution offers a superior method for restoring the expansion diameter accuracy of the drum. By determining the connecting rod dimensions through a constructed mathematical model, the maximum, minimum, and cylinder stroke of the drum can be restored to their original design values. This eliminates unnecessary expansion diameter adjustment time and even mitigates the possibility of production downtime due to slippage during unwinding caused by compromised accuracy.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows: a method for compensating the expansion diameter of a slider drum in a wedge connecting rod, the method comprising the following steps:

[0009] Step 1: First, you need to obtain the maximum diameter and perfect circle of the roll design. 、 Minimum diameter dimensions and their corresponding dimensions with the hydraulic cylinder. For ease of explanation, let the maximum expansion diameter of the drum be D0, the pre-expansion diameter of the drum be D1, the minimum shrinkage diameter be D2, the design thickness of the sector plate be t, and the center distance of the connecting rod pins be L.

[0010] Step 2: The fixed distance from the center of the lower connecting rod pin to the spindle is A, and the fixed distance from the center of the upper connecting rod pin to the highest point of the sector plate is B. Let the stroke of the expansion cylinder (the projection of the connecting rod in the horizontal direction), the distance between the spindle and the sector plate be F, and the drum diameter be F1 when it is at its maximum and F2 when it is at its minimum.

[0011] Step 3: Based on the design dimensions, the angle between the connecting rod and the mandrel at the minimum expansion diameter of the drum can be calculated and set as α. The angle between the connecting rod and the mandrel at the maximum expansion diameter of the drum is β. The positional relationship between the angle and the drum expansion diameter is shown in the following formula:

[0012] D2=(A+L×sinα+B)×2 (1)

[0013] Derivation

[0014] D0=(A+L×sinβ+B)×2 (2)

[0015] Derivation

[0016] β=arcsin[(D0 / 2-AB) / L].

[0017] Step 4: After the drum comes off the machine, a full-machine measurement or a disassembly measurement will be performed. The expansion diameter will definitely change after the measurement. The measurement will yield D0', D1', and D2'. The thicknesses of the four sector plates after the machine are taken off the line are t1, t2, t3, and t4, respectively. After the drum has been used for a period of time, it will be taken off the line for measurement and disassembly, and the following data can be obtained:

[0018] Δ0 = D0 - D0'

[0019] Δ1 = D - D1'

[0020] Δ2 = D2 - D2'

[0021] After obtaining the Δ data, take max(Δ0, Δ1, Δ2), and measure the thicknesses of the sector plates as t1, t2, t3, t4, respectively. Then, determine the overall wear amount as max{max(Δ0, Δ1, Δ2), [t-min(t1,t2,t3,t4)]×2}.

[0022] That is, the dimension X that needs to be compensated is X / 2 in unilateral compensation. After determining it, L' is determined using the model to ensure that the three data of maximum and minimum expansion diameter and cylinder stroke meet the original design.

[0023] Step 5: Using the dimensional data requiring accuracy restoration obtained in Step 4, and combining it with the designed angles and positional relationships, the following calculation model is derived:

[0024] Calculate the required compensation for the connecting rod pin center distance L' based on the minimum expansion diameter:

[0025] (3)

[0026] Calculate the required compensation for the connecting rod pin center distance L' based on the maximum expansion diameter:

[0027] (4)

[0028] Mutual integration: L1 = (L' + L”) / 2,

[0029] L1×K=L 终

[0030] K is typically between 1.0 and 1.1; X is the size that needs to be compensated based on the amount of wear detected.

[0031] After adjusting the connecting rod pin center, the maximum expansion diameter, minimum contraction diameter, and cylinder stroke of the drum are restored to the design dimensions. This compensation dimension is limited, and the specific limitation is determined according to the size of the drum.

[0032] Compared to existing technologies, this invention has the following advantages: It improves the accuracy of the expanded diameter of the repaired drum and the overall repair quality. Precise calculations effectively ensure the accuracy of the correspondence between the maximum and minimum drum expansion and the cylinder stroke. Repairs can be promptly verified, avoiding unnecessary rework and repairs. It also prevents unnecessary damage to equipment during frequent disassembly and hoisting due to substandard repair accuracy, guaranteeing successful equipment installation on the first attempt and ensuring the drum replacement parts are in good working order. Previously, each drum installation required secondary adjustments, necessitating the removal of the expansion cylinder's fixing flange bolts, taking at least 14 hours and requiring 5 workers. Adjustment and hoisting were inconvenient and posed safety risks, resulting in a heavy maintenance load. Typically, drum installation and adjustment were completed within two separate maintenance periods. The risk of slippage and collapse during unloading and adjustment after drum installation but before adjustment remained. This new solution eliminates the need for readjustment after drum installation, resolves the issue of deviations in the expansion diameter and cylinder stroke, and ensures precise control and stable production after drum installation. It completely eliminates the slippage and collapse problems caused by abnormal drum expansion. This reduces unnecessary calibration time and manpower during the drum cycle caused by the deviation of the maximum and minimum diameters, ensuring that the drum can be used normally from the time it is installed on the machine until it is taken off the production line. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the drum's operation.

[0034] Figure 2 This is a simplified model diagram of the drum expansion.

[0035] In the diagram: 1—mandrel, 2—wedge block, 3—sector plate, 4—connecting rod, 5—hollow shaft. Detailed Implementation

[0036] To enhance understanding of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0037] Example 1: See Figure 1 A method for compensating the expansion diameter of a slider drum in a wedge connecting rod, the method comprising the following steps:

[0038] Step 1: First, it is necessary to obtain the maximum diameter, minimum diameter of the perfect circle, and corresponding dimensions of the hydraulic cylinder when designing the drum. For ease of explanation, let the maximum expansion diameter of the drum be D0, the pre-expansion diameter be D1, the minimum shrinkage diameter be D2, the design thickness of the sector plate be t, and the center distance of the connecting rod pins be L.

[0039] Step 2: The fixed distance from the center of the lower connecting rod pin to the spindle is A, and the fixed distance from the center of the upper connecting rod pin to the highest point of the sector plate is B. Let the stroke of the expansion cylinder (the projection of the connecting rod in the horizontal direction), the distance between the spindle and the sector plate be F, and the drum diameter be F1 when it is at its maximum and F2 when it is at its minimum.

[0040] Step 3: Based on the design dimensions, the angle between the connecting rod and the mandrel at the minimum expansion diameter of the drum can be calculated and set as α. The angle between the connecting rod and the mandrel at the maximum expansion diameter of the drum is β. The positional relationship between the angle and the drum expansion diameter is shown in the following formula:

[0041] D2=(A+L×sinα+B)×2 (1)

[0042] We can derive α = arcsin [D0 / 2 - AB) / L]

[0043] D0=(A+L×sinβ+B)×2 (2)

[0044] We can derive β = arcsin [(D0 / 2 - AB) / L]

[0045] Step 4: After the drum comes off the machine, a full-machine measurement or a disassembly measurement will be performed. The expansion diameter will definitely change after the measurement. The measurement will yield D0', D1', and D2'. The thicknesses of the four sector plates after the machine are taken off the line are t1, t2, t3, and t4, respectively. After the drum has been used for a period of time, it will be taken off the line for measurement and disassembly, and the following data can be obtained:

[0046] Δ0 = D0 - D0'

[0047] Δ1 = D - D1'

[0048] Δ2 = D2 - D2'

[0049] After obtaining the Δ data, we take max(Δ0, Δ1, Δ2) and measure the thicknesses of the sector plates as t1, t2, t3, t4. Then, we use the overall wear amount max{max(Δ0, Δ1, Δ2),[t-min(t1,t2,t3,t4)]×2} to determine the size X that needs to be compensated. For single-sided compensation, it is X / 2. After determining this, we use the model to determine L' to ensure that the maximum and minimum expansion diameter and cylinder stroke data meet the original design.

[0050] Step 5: Using the dimensional data requiring accuracy restoration obtained in Step 4, and combining it with the designed angles and positional relationships, the following calculation model is derived:

[0051] Calculate the required compensation for the connecting rod pin center distance L' based on the minimum expansion diameter:

[0052] (3)

[0053] Calculate the required compensation for the connecting rod pin center distance L' based on the maximum expansion diameter:

[0054] (4)

[0055] Mutual integration: L1 = (L' + L”) / 2,

[0056] L1×K=L 终

[0057] K is typically between 1.0 and 1.1; X is the size that needs to be compensated based on the amount of wear detected.

[0058] After adjusting the connecting rod pin center, the maximum expansion diameter, minimum contraction diameter, and cylinder stroke of the drum are restored to the design dimensions. This compensation dimension is limited, and the specific limitation is determined according to the size of the drum.

[0059] like Figure 1 As shown:

[0060] In the aforementioned method for compensating for the expansion of the drum, the maximum expansion of the drum refers to the diameter of the drum when the drum's tie rod extends to its designed maximum extent. The measurement is taken at the highest (lowest) tangent point of the sector plate using an outside micrometer.

[0061] In the aforementioned method for compensating for the expansion of the drum, the minimum expansion of the drum refers to the minimum extension of the drum's tie rod in the design. The drum's diameter is measured at the highest and lowest points of the sector plate using an outside micrometer.

[0062] In the aforementioned method for compensating for the expansion of the drum, the "perfect circle" of the drum refers to the designed extension of the drum's tie rod, the diameter of the drum in its perfect circle state, the dimension of any position of the sector plate, and the measurement using an outside micrometer.

[0063] In the aforementioned drum expansion compensation method, the connecting rod is a crucial component for achieving drum expansion. One end is fixed to the mandrel, and the other end is connected to the sector plate. It is arranged at 90° in the circumferential direction and moves within the fixed hole of the hollow shaft. When the mandrel moves back and forth, the angle between the connecting rod and the mandrel changes, thereby achieving the change in drum expansion. The wedge slides on its surface and cooperates with the connecting rod to achieve expansion. Generally, there are two sets of four wedges in each set, which are matched with the sector plate, and the connecting rods are spaced 90° apart.

[0064] In the aforementioned drum expansion compensation method, the drum spindle 1 is installed inside a hollow shaft, and one end of the connecting rod is fixed by a pin to drive it to move back and forth. It is connected and fixed to the expansion and contraction cylinder through a Haval coupling, and the power is provided by the expansion and contraction cylinder.

[0065] In the aforementioned drum expansion compensation method, the hollow shaft 5 is an important supporting component for realizing drum expansion. The mandrel is installed inside it, the wedge block is fixed, and the range of motion angle of the connecting rod is also limited by the hollow shaft.

[0066] In the aforementioned drum expansion compensation method, the inclined block 2 is an important component for realizing drum expansion. Its lower surface moves relative to the spindle and is fixed inside the hollow shaft. During the movement of the hollow shaft, it passively moves upwards along the inclined line. At the same time, under the action of the spring of the inclined wedge block, the sector plate is always in an outward expansion state.

[0067] In the aforementioned drum expansion compensation method, the sector plate 3 and the connecting rod 4 are connected by bolts and installed on the hollow shaft. During the expansion process, they have relative displacement with the hollow shaft.

[0068] Specific Embodiment 1: A method for compensating the expansion diameter of a slider drum in a wedge connecting rod, the method comprising the following steps:

[0069] Step 1: First, consult the drawings to find that the maximum expansion diameter of the original design drum is φ770mm, the minimum expansion diameter is φ730mm, the diameter of the perfect circle is φ752mm, the thickness of the sector plate is t=254mm, and the center distance of the connecting rod pin shaft is set to L=196.16mm.

[0070] Step 2: By referring to the drawings, we find that the cylinder stroke is 61.55mm, the connecting rod length is A=98mm, B=93mm, and the thickness of the sector plate is the maximum expansion diameter F1=346mm and the minimum expansion diameter F2=284.55mm.

[0071] Step 3, through Figure 1The positional relationships shown are obtained through calculation.

[0072] α= arcsin[(D2 / 2-AB) / L )] = arcsin[730 / 2-93-98) / 196.16]= 62.5°

[0073] β=arcsin[(D0 / 2-AB) / L ]= arcsin[770 / 2-93-98) / 196.16]=81.49°

[0074] Step 4: After the drum is disassembled and removed from the production line, the maximum diameter is measured to be φ766mm, the minimum diameter to be φ726.5mm, and the diameter of the circle to be φ748mm. Calculations can then be performed to obtain...

[0075] Δ0 = D0 - D0' = 770 - 766 = 4mm

[0076] Δ1= D- D1'= 730- 726.5= 3.5mm

[0077] Δ2 = D2 - D2' = 752 - 748 = 4mm

[0078] The determined expansion compensation is max(4,3.5,4)=4mm.

[0079] The design dimensions of the four sector plates were measured to be 254 mm, t1'=253.1 mm, t2'=252.2 mm, t3'=253.5 mm, t4'=252.9 mm; min(253.1,252.2,253.5,252.9)=252.2 mm.

[0080] 254-252.2=1.8mm

[0081] X=max{max(Δ0, Δ1, Δ2),[t-min(t1,t2,t3,t4)]×2}=max(4,1.8×2)=4mm

[0082] Step 5: Calculate the required compensation for the center distance L' of the connecting rod pins based on the minimum expansion diameter:

[0083] L'= ==" =197.9673mm

[0084] Calculate the required compensation for the connecting rod pin center distance L' based on the maximum expansion diameter:

[0085] L”= = =198.1664mm

[0086] Mutual integration: L1 = (L' + L”) / 2 = (197.9673 + 198.1664) / 2 = 197.9267 mm

[0087] L1×K=L 终 =197.9267 × 1.00037 = 198 mm

[0088] K is usually taken between 1.0 and 1.1.

[0089] Based on the dimensions calculated above, the wedge block needs to compensate for an area of ​​X / 2 = 2 mm.

[0090] Step 6: After the connecting rod dimensions are determined, it is machined; after the wedge dimensions are determined, it is welded; and vulnerable parts are replaced.

[0091] Step 7: After the drum is assembled, measure the maximum (φ770 mm), minimum diameter (730 mm), and stroke (61.5 mm) dimensions. After acceptance, package and ship.

[0092] Step 8: Install and put the drum into use. calibrate the minimum diameter (φ770 mm), minimum diameter (730 mm), and stroke (61.5 mm). The drum is then put into normal use.

[0093] Specific Embodiment 2: A method for compensating the expansion diameter of a slider drum in a wedge connecting rod, the method comprising the following steps:

[0094] Step 1: First, consult the drawings to find that the maximum expansion diameter of the original design drum is φ770mm, the minimum expansion diameter is φ730mm, the diameter of the perfect circle is φ752mm, the thickness of the sector plate is t=254mm, and the center distance of the connecting rod pin shaft is set to L=196.16mm.

[0095] Step 2: By referring to the drawings, we find that the cylinder stroke is 61.55mm, the connecting rod length is A=98mm, B=93mm, and the thickness of the sector plate is the maximum expansion diameter F1=346mm and the minimum expansion diameter F2=284.55mm.

[0096] Step 3, through Figure 1 The positional relationships shown are obtained through calculation.

[0097] α= arcsin[(D2 / 2-AB) / L )] = arcsin[730 / 2-93-98) / 196.16]= 62.5°

[0098] β=arcsin[(D0 / 2-AB) / L ]= arcsin[770 / 2-93-98) / 196.16]=81.49°

[0099] Step 4: After the drum is disassembled and removed from the production line, the maximum diameter is measured to be φ768mm, the minimum diameter to be φ727.5mm, and the diameter of the circle to be φ747mm. Calculations can then be performed to obtain...

[0100] Δ0 = D0 - D0' = 770 - 768 = 2mm

[0101] Δ1= D- D1'= 730- 727.5= 2.5mm

[0102] Δ2 = D2 - D2' = 752 - 747 = 3mm

[0103] The determined expansion diameter compensation is max(4,3.5,4)=3mm.

[0104] The design dimensions of the four sector plates were measured to be 254 mm, t1'=252.1 mm, t2'=252.2 mm, t3'=253.5 mm, t4'=252.9 mm; min(252.7,252.8,252.4,252.3)=252.4 mm.

[0105] 254-252.1=1.6mm

[0106] X=max{max(Δ0, Δ1, Δ2),[t-min(t1,t2,t3,t4)]×2}=max(3,1.6×2)=3.2mm

[0107] Step 5: Calculate the required compensation for the center distance L' of the connecting rod pins based on the minimum expansion diameter:

[0108] L'= = =197.58mm

[0109] Calculate the required compensation for the connecting rod pin center distance L' based on the maximum expansion diameter:

[0110] L”= = =197.74mm

[0111] Mutual integration: L1 = (L' + L”) / 2 = (197.9673 + 198.1664) / 2 = 197.66 mm

[0112] L1×K=L 终 =197.66 × 1.00045 = 197.75 mm

[0113] K is usually taken between 1.0 and 1.1.

[0114] Based on the dimensions calculated above, the required compensation dimension for the wedge block is X / 2 = 1.6 mm.

[0115] Step 6: After the connecting rod dimensions are determined, it is machined; after the wedge dimensions are determined, it is welded; and vulnerable parts are replaced.

[0116] Step 7: After the drum is assembled, measure the maximum (φ770 mm), minimum diameter (730 mm), and stroke (61.5 mm) dimensions. After acceptance, package and ship.

[0117] Step 8: Install and put the drum into use. calibrate the minimum diameter (φ770 mm), minimum diameter (730 mm), and stroke (61.5 mm). The drum is then put into normal use.

[0118] After the roll is loaded onto the machine, the long downtime for adjusting the diameter is eliminated, the risk of slippage during unloading is eliminated, and the roll can be removed after a stable cycle of normal use.

[0119] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. A method for compensating the expansion diameter of a slider drum in a wedge-shaped connecting rod, characterized in that, The method includes the following steps: Step 1: Let the maximum expansion diameter of the drum be D0, the pre-expansion diameter of the drum be D1, the minimum reduction diameter be D2, the design thickness of the sector plate be t, and the center distance of the connecting rod pins be L. Step 2: The fixed distance from the center of the lower pin of the connecting rod to the spindle is A, and the fixed distance from the center of the upper pin of the connecting rod to the highest point of the sector plate is B. Let the stroke of the expansion cylinder be the projection of the connecting rod in the horizontal direction, the distance between the spindle and the sector plate be F, and the maximum expansion diameter of the drum be F1 and the minimum expansion diameter be F2. Step 3: Calculate the angle between the connecting rod and the mandrel when the drum has its minimum expansion diameter using the design dimensions, and set it as α. Also calculate the angle β between the connecting rod and the mandrel when the drum has its maximum expansion diameter. Step 4: After the drum comes off the machine, a full-machine measurement or disassembly measurement will be performed to determine the overall wear amount, which is the dimension X that needs to be compensated. Step 5: Using the dimensional data requiring accuracy restoration obtained in Step 4, and combining it with the designed angles and positional relationships, the following calculation model is derived: Calculate the required compensation for the connecting rod pin center distance L' based on the minimum expansion diameter: （3） Calculate the required compensation for the center distance of the connecting rod pin based on the maximum expansion diameter. : （4） Mutual integration: L1 = (L' + L”) / 2, L1×K=L 终 K is between 1.0 and 1.

1. After adjusting the connecting rod pin center, the maximum expansion diameter, minimum contraction diameter, and cylinder stroke of the drum are restored to the design dimensions. This compensation dimension is limited, and the specific limitation is determined according to the size of the drum.

2. The method for compensating the expansion diameter of a slider drum in a wedge connecting rod according to claim 1, characterized in that, The positional relationship between the included angle and the drum expansion diameter in step 3 is shown in the following formula: D2=(A+L×sinα+B)×2 (1) Derivation D0=(A+L×sinβ+B)×2 (2) Derivation β=arcsin[(D0 / 2-AB) / L].

3. The method for compensating the expansion diameter of a slider drum in a wedge-shaped connecting rod according to claim 2, characterized in that, In step 4, the expansion diameter changes after measurement, and D0', D1', and D2' are measured. The thicknesses of the four sector plates are t1, t2, t3, and t4, respectively. After the drum has been used for a period of time, it is taken offline for measurement and disassembly, and the following data is obtained: Δ0 = D0 - D0'; Δ1 = D1 - D1'; Δ2 = D2 - D2'; After obtaining the Δ data, take max(Δ0, Δ1, Δ2) and measure the thickness of the sector plate as t1, t2, t3, t4, thus determining the overall wear amount max{max(Δ0, Δ1, Δ2), [t-min(t1,t2,t3,t4)]×2}, which is the size X that needs to be compensated. For single-sided compensation, it is X / 2. After determining this, use the model to determine L' to ensure that the maximum and minimum expansion diameter and cylinder stroke data meet the original design.

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