Hydraulic and electrical control device and method for combined oil cylinder of shield machine

Abstract

The present invention provides a hydraulic and electrical control device and method for use with a combined oil cylinder of a shield machine, comprising a main control unit, a voltage-current conversion unit, and a proportional speed control unit. There are multiple voltage-current conversion units and multiple proportional speed control units, and each oil cylinder is correspondingly provided with a voltage-current conversion unit and a proportional speed control unit. The multiple voltage-current conversion units are all connected to the main control unit, and each voltage-current conversion unit is connected to a proportional speed control unit, and each proportional speed control unit is connected to an oil cylinder. The hydraulic and electrical control device and method for use with a combined oil cylinder of a shield machine described in the present invention solves the problem that due to the inconsistent specifications of the propulsion oil cylinders before and after modification, there is currently no effective method to achieve a consistent extension speed for cylinders of different specifications on the shield machine, which cannot meet the most basic use requirements of the shield machine propulsion system.

Description

Technical Field

[0001] The invention belongs to the technical field of shield machine oil cylinder control, and in particular relates to a hydraulic and electrical control device and method for a combined oil cylinder of a shield machine. Background Art

[0002] In recent years, the construction of urban subways and underground pipelines has developed rapidly, and the demand for shield machines has increased sharply. Construction units can expand the diameter of old shield machines according to the project conditions to meet the construction requirements of new projects. After the construction unit expands the diameter of the shield machine, due to the increase in the specifications of the pipe segments, the thrust demand of the shield machine's propulsion cylinder for the new project increases. If the thrust of the original equipment's propulsion cylinder cannot meet the use requirements of the new project, it is necessary to re-manufacture the propulsion cylinder during the diameter expansion process. Since the specifications of the propulsion cylinders before and after the transformation are inconsistent, there is currently no effective method to make the extension speed of cylinders of different specifications on the shield machine consistent, which cannot meet the most basic use requirements of the shield machine propulsion system. Therefore, the entire system needs to be replaced with a larger-sized propulsion cylinder to meet the use requirements. As a result, the original equipment's propulsion cylinder cannot be effectively reused after being dismantled, resulting in waste. Summary of the Invention

[0003] In view of this, the present invention proposes a hydraulic and electrical control device and method for the use of a combined cylinder of a shield machine to solve the problem that due to the inconsistent specifications of the propulsion cylinders before and after the modification, there is currently no effective method to make the extension speed of cylinders of different specifications on the shield machine consistent, which cannot meet the most basic usage requirements of the shield machine propulsion system.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] On the one hand, the present invention proposes a shield machine combined cylinder using the following hydraulic and electrical control devices, including a main control unit, a voltage and current conversion unit, and a proportional speed control unit. There are multiple voltage and current conversion units and proportional speed control units. Each cylinder is correspondingly provided with a voltage and current conversion unit and a proportional speed control unit. Multiple voltage and current conversion units are all connected to the main control unit, each voltage and current conversion unit is connected to a proportional speed control unit, and each proportional speed control unit is connected to a cylinder.

[0006] Furthermore, the main control unit is a PLC controller.

[0007] Furthermore, the voltage-current conversion unit is an amplifier.

[0008] Furthermore, the proportional speed control unit is a proportional speed control valve.

[0009] Furthermore, it also includes a potentiometer, which is installed on the console panel of the main control room of the shield machine and is electrically connected to the main control unit.

[0010] On the other hand, a method for using the hydraulic and electrical control device for a shield machine combined cylinder includes the following steps:

[0011] S1: Multiple points are set circumferentially on the segment corresponding to the shield machine. The points are arranged in pairs, and there is an interval between two adjacent pairs of points.

[0012] S2: Group multiple pairs of points according to the segment division and the bolt hole distribution on the segment;

[0013] S3: Each point is equipped with a corresponding propulsion cylinder;

[0014] S4: Calculate the maximum thrust T0 provided by the propulsion system of the shield machine before modification;

[0015] S5: The maximum thrust T0 provided by the propulsion system before the shield machine transformation is used to calculate the thrust ratio t0 when the original shield machine propulsion cylinder is reused;

[0016] S6: Compare the thrust ratio t0 when reusing the original shield machine propulsion cylinder with the ratio t of the total thrust of the propulsion system to the excavation area of the shield machine cutter head. If t0 is less than t, replace the small-sized propulsion cylinders in some propulsion cylinder groups with large-sized propulsion cylinders.

[0017] S7: Calculate the maximum thrust T1 provided by the propulsion system after the propulsion cylinder is replaced;

[0018] S8: Calculate the thrust ratio t1 of the shield machine after replacing the propulsion cylinder by using the maximum thrust T1 provided by the propulsion system after replacing the propulsion cylinder;

[0019] S9: Determine whether t1 is greater than t. If t1 is greater than t, the shield machine after replacing the thrust cylinder can meet the construction thrust requirement.

[0020] Furthermore, the calculation method of the maximum thrust T0 provided by the propulsion system of the shield machine before the transformation in step S4 is as follows:

[0021] T0=πD 2 / 4Pi0,

[0022] Where D is the inner diameter of the propulsion cylinder, i0 is the number of propulsion cylinders, and P is the maximum oil pressure of the propulsion system.

[0023] Furthermore, the calculation method of the thrust ratio t0 when the original shield machine propulsion cylinder is reused in step S5 is as follows:

[0024] t0=T0 / A,

[0025] Among them, A is the cutterhead excavation area after the shield machine is modified.

[0026] Furthermore, the maximum thrust T1 provided by the propulsion system after the propulsion cylinder is replaced in step S7 is calculated as follows:

[0027] T1=πD 2 / 4P i +πD1 2 / 4P i1 ,

[0028] Among them, D is the inner diameter of the original propulsion cylinder, i is the number of the original propulsion cylinders called up, D1 is the inner diameter of the new propulsion cylinder, i1 is the number of the new propulsion cylinders, and P is the maximum oil pressure of the propulsion system.

[0029] Furthermore, the thrust ratio t1 of the shield machine after the propulsion cylinder is replaced in step S8 is calculated as follows:

[0030] t1=T1 / A,

[0031] Among them, A is the cutterhead excavation area after the shield machine is modified.

[0032] Compared with the existing technology, the present invention has the following beneficial effects: the hydraulic and electrical control device and method for using the combined oil cylinder of a shield machine proposed in the present invention can reuse the remaining oil cylinders after the diameter expansion and transformation of old shield equipment, avoiding the waste of the remaining old oil cylinders, improving the utilization rate of old parts, and also further reducing the equipment transformation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 This is a schematic diagram of a hydraulic and electrical control device and method for a combined oil cylinder of a shield machine according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the combined use of propulsion cylinder groups. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] like Figure 1 As shown, a shield machine combined cylinder uses the following hydraulic and electrical control device, including a main control unit, a voltage-current conversion unit, and a proportional speed control unit. There are multiple voltage-current conversion units and proportional speed control units. Each cylinder is correspondingly provided with a voltage-current conversion unit and a proportional speed control unit. Multiple voltage-current conversion units are all connected to the main control unit, each voltage-current conversion unit is connected to a proportional speed control unit, and each proportional speed control unit is connected to a cylinder.

[0041] like Figure 1 As shown, the main control unit is a PLC controller.

[0042] like Figure 1 As shown, the voltage-current conversion unit is an amplifier.

[0043] like Figure 1 As shown, the proportional speed control unit is a proportional speed control valve.

[0044] like Figure 1 As shown, it also includes a potentiometer, which is installed on the console panel of the main control room of the shield machine and is electrically connected to the main control unit.

[0045] The PLC receives a 0-10V signal from a potentiometer and feeds it to amplifiers in different groups. The amplifiers, using a pre-programmed conversion algorithm, convert the voltage into a current output. Each amplifier in each group then outputs the current to its own proportional speed control valve. The valves then actuate based on the input current, delivering their own flow rate. Ultimately, this ensures consistent ejection speeds for cylinders of varying sizes and sizes across the group.

[0046] Each grouping has a different number of cylinders and different sizes. The large cylinders are newly manufactured, while the small cylinders are reused. By assigning different algorithms to the amplifiers corresponding to the electric proportional speed control valves in each group, each group of electric proportional speed control valves outputs different flow rates. This allows for the requirement of synchronized propulsion while maintaining the same overall cylinder push speed despite the different numbers and sizes of propulsion cylinders in each group.

[0047] Example 1

[0048] like Figure 2 As shown in the figure, shield machine propulsion cylinders are typically grouped based on segment segmentation and the distribution of segment bolt holes. For example, a shield machine remanufacturing project was designed for segments with an outer diameter of 6200mm, an inner diameter of 5500mm, a circumferential width of 1500mm, and a bolt hole index of 22.5°. The segment bolt installation holes comprise 16 locations. Based on the equipment design requirements, the propulsion cylinders were grouped. The equipment was equipped with 32 propulsion cylinders, ranging in size from φ220 / φ180-2150mm. These cylinders were divided into 16 propulsion locations, with two propulsion cylinders installed at each location. These 16 propulsion cylinder groups were divided into four control zones: upper Group D (3 propulsion locations, 6 cylinders), lower Group B (5 propulsion locations, 10 cylinders), left Group C (4 propulsion locations, 8 cylinders), and right Group A (4 propulsion locations, 8 cylinders). The owner plans to expand the diameter of the shield machine. After the expansion, the equipment is suitable for the specifications of 6700mm outer diameter, 6000mm inner diameter, 1500mm ring width, and 22.5° bolt hole indexing. After the expansion, the shield machine cutterhead excavation diameter is 6980mm. Before the equipment transformation, the total thrust provided by the propulsion system is:

[0049] T0=πD 2 / 4Pi0=3.14×0.222÷4×350×105÷1000×32N

[0050] =42553kN

[0051] Where: T0—maximum thrust provided by the propulsion system before equipment modification / (kN);

[0052] D—inner diameter of propulsion cylinder, D=0.22(m);

[0053] i0—number of propulsion cylinders, i0=32;

[0054] P—maximum oil pressure of propulsion system, P=350bar.

[0055] The total thrust of the propulsion system is measured by the thrust ratio t based on construction experience. The thrust ratio t refers to the ratio of the total thrust of the propulsion system to the excavation area of the shield cutter head. Generally, the thrust ratio t of a 6-8m shield machine is ≥1200kN / m 2 .

[0056] After the equipment was modified, the thrust requirements for the propulsion system increased due to the increase in the specifications of the new project segments. Through calculation, if the original equipment propulsion cylinder is reused, the thrust ratio of the modified equipment will be:

[0057] t0=T0 / A=42553÷(3.14×6.98 2 ÷4)=1112.6kN / m 2

[0058] Where: t0—thrust ratio when reusing the original equipment propulsion cylinder / (kN / m 2 );

[0059] T0—maximum thrust provided by the propulsion system before equipment modification / (kN);

[0060] A—cutterhead excavation area after equipment transformation / (m 2 );

[0061] Through the above calculation, we know that t0<1200kN / m 2 If the original propulsion cylinder is reused, the equipment may become stuck in high-friction formations or when turning. Therefore, during equipment renovations, the propulsion cylinder is usually replaced with a larger cylinder, leaving the original propulsion cylinder idle and wasted, increasing the equipment renovation cost for the customer.

[0062] The remanufactured equipment in this case has a total of 16 propulsion points, each equipped with two propulsion cylinders, divided into four groups: A, B, C, and D. Typically, each group of regional cylinders is supplied with high-pressure oil from the same distribution valve group. The massive thrust generated by the simultaneous operation of these cylinder groups is sufficient to propel and steer the shield machine forward. Therefore, when utilizing a combination of propulsion cylinders, the entire group of regional cylinders must be replaced to facilitate synchronization. After replacing the propulsion cylinders, the following requirements must be met: the total thrust of the propulsion system meets the design requirements, and as many existing propulsion cylinders as possible should be reused to save costs. Therefore, the following combination was adopted: Groups B and D were replaced with new, larger-sized propulsion cylinders, while Groups A and C retained the original equipment's propulsion cylinders. Groups B and D used new, larger-sized propulsion cylinders, measuring φ240 / φ220-2150mm, totaling 16 cylinders.

[0063] After the propulsion system A, B, C, and D cylinders are combined, the propulsion cylinders of groups A and C use the original equipment cylinders, totaling 16, with cylinder specifications of φ220 / φ180-2150mm; groups B and D use new large-size propulsion cylinders, totaling 16, with cylinder specifications of φ240 / φ220-2150mm. After the propulsion cylinders are combined, the total thrust provided by the propulsion system is:

[0064] T1=πD 2 / 4Pi+πD1 2 / 4Pi1=3.14×0.222÷4×350×105÷1000×16kN+3.14×0.24 2 ÷4×350×105÷1000×16kN≈46598kN

[0065] Where: T1—maximum thrust provided by the propulsion system before equipment modification / (kN);

[0066] D—inner diameter of the original propulsion cylinder, D=0.22 (m);

[0067] i—the number of original propulsion cylinders to be called, i=16;

[0068] D1—Inner diameter of the new propulsion cylinder, D1=0.24 (m);

[0069] i1—number of new propulsion cylinders, i1=16;

[0070] P—maximum oil pressure of propulsion system, P=350bar.

[0071] After the propulsion cylinders are combined and used, the thrust ratio of the equipment is:

[0072] t1=T1 / A=46598÷(3.14×6.98 2 ÷4)=1218.4kN / m2

[0073] Where: t1—thrust ratio of the propulsion cylinder combination (kN / m 2 );

[0074] T1—maximum thrust provided by the propulsion system after the propulsion cylinder combination is utilized / (kN);

[0075] A—cutterhead excavation area after equipment transformation / (m 2 );

[0076] From the above calculation, we know that t1>1200kN / m 2 Therefore, the propulsion system can meet the construction thrust requirements by combining the use of propulsion cylinders.

[0077] Therefore, the research on the method of combined utilization of propulsion cylinders in shield machine remanufacturing in this paper can provide a reference basis for the transformation of the propulsion system during the subsequent shield machine expansion and remanufacturing, which is of great significance.

[0078] From the above results, it can be seen that the propulsion speed synchronization of the four propulsion cylinders in the propulsion system, groups A, B, C, and D, is basically consistent, and the control current range of the proportional speed control valve is reasonable, which meets the design requirements.

[0079] By adopting this method, the remaining cylinders of old shield equipment after diameter expansion and transformation can be reused, avoiding the waste of the remaining old cylinders, improving the utilization rate of old parts, and further reducing the cost of equipment transformation.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for using a hydraulic and electrical control device for a combined oil cylinder of a shield machine, characterized in that: include: S1: Multiple points are set circumferentially on the segment corresponding to the shield machine. The points are arranged in pairs, and there is an interval between two adjacent pairs of points. S2: Group multiple pairs of points according to the segment division and the bolt hole distribution on the segment; S3: Each point is equipped with a corresponding propulsion cylinder; S4: Calculate the maximum thrust T0 provided by the propulsion system of the shield machine before modification; S5: Calculate the thrust ratio t0 when reusing the original shield machine propulsion cylinder based on the maximum thrust T0 provided by the propulsion system before the shield machine is modified. The thrust ratio is the ratio of the maximum thrust T0 provided by the propulsion system before the shield machine is modified to the cutterhead excavation area A after the shield machine is modified. The thrust ratio t0 is calculated by the following formula: t0=T0 / A; S6: Compare the thrust ratio t0 when reusing the original shield machine propulsion cylinder with the ratio t of the total thrust of the propulsion system to the excavation area of the shield machine cutter head. If t0 is less than t, replace the small-sized propulsion cylinders in some propulsion cylinder groups with large-sized propulsion cylinders. S7: Calculate the maximum thrust T1 provided by the propulsion system after the propulsion cylinder is replaced; S8: Calculate the thrust ratio t1 of the shield machine after the propulsion cylinder is replaced based on the maximum thrust T1 provided by the propulsion system after the propulsion cylinder is replaced. The calculation method of the thrust ratio t1 of the shield machine after the propulsion cylinder is replaced is as follows: t1=T1 / A; S9: Determine whether t1 is greater than t. If t1 is greater than t, the shield machine after replacing the thrust cylinder can meet the construction thrust requirement.

2. The method of use according to claim 1, wherein: The calculation method for the maximum thrust T0 provided by the propulsion system of the shield machine before the transformation in step S4 is as follows: T0=πD 2 / 4Pi0, Where D is the inner diameter of the propulsion cylinder, i0 is the number of propulsion cylinders, and P is the maximum oil pressure of the propulsion system.

3. The method of use according to claim 1, wherein: The maximum thrust T1 provided by the propulsion system after the propulsion cylinder is replaced in step S7 is calculated as follows: T1=πD 2 / 4Pi+πD1 2 / 4Pi1, Among them, D is the inner diameter of the original propulsion cylinder, i is the number of the original propulsion cylinders called up, D1 is the inner diameter of the new propulsion cylinder, i1 is the number of the new propulsion cylinders, and P is the maximum oil pressure of the propulsion system.

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