CN119528063A - Large mining height working face hydraulic support overhauling equipment and overhauling method - Google Patents
Large mining height working face hydraulic support overhauling equipment and overhauling method Download PDFInfo
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- CN119528063A CN119528063A CN202411650983.3A CN202411650983A CN119528063A CN 119528063 A CN119528063 A CN 119528063A CN 202411650983 A CN202411650983 A CN 202411650983A CN 119528063 A CN119528063 A CN 119528063A
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Abstract
本发明公开了一种大采高工作面液压支架检修设备和检修方法，包括吊起装置和作业平台，吊起装置用于安装于掩护梁处，吊起装置与作业平台相连，作业平台用于供操作人员进入并在吊起后进行检修作业；作业平台包括底板和多个侧板，多个侧板设于底板的外周侧，且至少部分侧板相对于底板可摆动以使作业平台具有起吊状态和作业状态；在起吊状态，多个侧板翻转于底板的上方并在底板的上方围成内腔，内腔用于在作业平台向上吊起的过程中容纳操作人员，在作业状态，至少部分侧板翻转至与底板平齐以增加操作人员的作业范围。本发明的检修设备能够将操作人员升起，从而使得操作人员能够对顶梁后部、掩护梁上部的连接处进行检修维护。
The present invention discloses a maintenance equipment and maintenance method for a hydraulic support of a large mining height working face, including a lifting device and a working platform, wherein the lifting device is used to be installed at a shielding beam, the lifting device is connected to the working platform, and the working platform is used for operators to enter and perform maintenance work after lifting; the working platform includes a bottom plate and a plurality of side plates, the plurality of side plates are arranged on the outer peripheral side of the bottom plate, and at least part of the side plates can swing relative to the bottom plate so that the working platform has a lifting state and an operating state; in the lifting state, the plurality of side plates are turned over above the bottom plate and form an inner cavity above the bottom plate, and the inner cavity is used to accommodate operators in the process of lifting the working platform upwards, and in the operating state, at least part of the side plates are turned over to be flush with the bottom plate to increase the operating range of the operators. The maintenance equipment of the present invention can lift the operators, so that the operators can perform maintenance and repair on the connection between the rear of the top beam and the upper part of the shielding beam.
Description
Technical Field
The invention relates to the technical field of mining equipment, in particular to large mining height working face hydraulic support maintenance equipment and a maintenance method.
Background
At present, the supporting height of the hydraulic support of the oversized mining height working face can reach 10m, and the distance between the connecting position of the back part of the top beam of the oversized mining height hydraulic support and the upper part of the shield beam and the base sidewalk can reach 7.5m. Because the mine pressure of the oversized mining height working face shows stronger, the hydraulic support of the oversized mining height working face cannot descend for a long time to overhaul in the stoping process, so that the jack, structural part, hydraulic system, circuit and the like at the connecting position have the problem of difficult overhaul and maintenance.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the embodiment of the invention provides the large mining height working face hydraulic support maintenance equipment which can lift operators, so that the operators can carry out maintenance on the connection parts of the rear part of the top beam and the upper part of the shield beam.
The embodiment of the invention also provides an overhaul method based on the overhaul equipment of the hydraulic support of the large mining height working face.
The large mining height working face hydraulic support overhauling equipment comprises a lifting device and an operation platform, wherein the lifting device is used for being installed at a shield beam, the lifting device is connected with the operation platform and used for lifting the operation platform upwards, and the operation platform is used for operators to enter and overhaul after lifting;
The working platform comprises a bottom plate and a plurality of side plates, the side plates are arranged on the periphery side of the bottom plate, and at least part of the side plates can swing relative to the bottom plate so as to enable the working platform to have a lifting state and a working state;
In the lifting state, a plurality of side plates are overturned above the bottom plate and are surrounded into an inner cavity above the bottom plate, the inner cavity is used for accommodating an operator in the process of lifting the working platform upwards, and in the working state, at least part of the side plates are overturned to be flush with the bottom plate so as to increase the working range of the operator.
In some embodiments, the plurality of side plates includes two fixed plates disposed opposite each other and two movable plates disposed opposite each other, the fixed plates are fixedly connected to the base plate and located above the base plate, the movable plates are rotatably assembled to the base plate so that the working platform can be switched to the lifting state or the working state, and each of the fixed plates is connected to the lifting device.
In some embodiments, the lifting device comprises a winch for mounting at the shield beam and a lifting rope wound around the winch and connected to the fixing plate.
In some embodiments, the fixing plate is provided with a plurality of hanger rope holes for connection with the hanger rope and safety rope holes for connection with the safety rope.
In some embodiments, a plurality of the lifting rope holes and the safety rope holes are all provided on the top side of the fixing plate, and the safety rope holes are provided between two of the lifting rope holes.
In some embodiments, the number of the lifting devices is two, the two lifting devices are arranged at intervals in the width direction of the shield beam, and the plurality of the lifting rope holes of the same fixing plate are connected with the lifting ropes of the same lifting device.
In some embodiments, the moveable plate is provided with a fixed rope hole for connection with a fixed rope in the operational state.
In some embodiments, two of the fixed plates are arranged opposite to each other in a width direction of the shield beam, and two of the movable plates are arranged opposite to each other in a direction orthogonal to the width direction;
And/or the bottom plate is rectangular, the fixed plate is connected with the short side of the bottom plate, and the movable plate is connected with the long side of the bottom plate;
and/or a plurality of through holes are uniformly distributed on the fixed plate.
In some embodiments, a plurality of legs are included, the underside of the base plate is provided with a plurality of sleeves, in the operational state, the legs are secured within the sleeves, and the legs are for supporting the work platform.
The overhauling method of the embodiment of the invention comprises the following steps:
Switching the operation platform to a hoisting state and connecting the operation platform with a hoisting device;
lifting the operation platform upwards through the lifting device;
After the operation platform is lifted to a set position, switching the operation platform to an operation state;
Connecting a safety rope with the operation platform, and connecting a fixed rope with the overturned side plate;
and finishing maintenance operation on the operation platform.
The large mining height working face hydraulic support maintenance equipment and the large mining height working face hydraulic support maintenance method have the beneficial effects that operators can be lifted by the large mining height working face hydraulic support maintenance equipment, so that the operators can carry out maintenance on the joints of the rear part of the top beam and the upper part of the shield beam.
Drawings
Fig. 1 is a schematic view of a part of the construction of an inspection apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic view of an operation platform of the service equipment according to an embodiment of the present invention in a lifted state.
Fig. 3 is a schematic view of an operation platform of an inspection apparatus according to an embodiment of the present invention in an operation state.
Fig. 4 is a schematic view of the winch according to an embodiment of the present invention being mounted on a shield beam.
Fig. 5 is a schematic view of a sleeve of a base plate of an embodiment of the present invention.
Reference numerals:
1-lifting device, 11-winch, 12-lifting rope;
2-an operation platform, 21-a bottom plate, 211-a sleeve, 22-a side plate, 221-a fixed plate, 2211-a lifting rope hole, 2212-a safety rope hole, 2213-a through hole, 222-a movable plate, 2221-a fixed rope hole and 23-an inner cavity;
3-shield beams.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
in the prior art, when overhauling is carried out by descending the hydraulic support, broken rock of an overlying strata is easy to leak down from a space, so that accidents such as roof fall, roof leakage, lasting and the like are easy to cause, and the production safety and the production efficiency are easy to influence.
In order to avoid the above-mentioned situation, in the related art, a manual construction mode of an equal-height working platform is often adopted to carry out maintenance, in the process of constructing the equal-height platform, because the pavement space of the hydraulic support is limited, workers are required to transport the support legs, the platform and the like welded in advance to a working place respectively for assembly, and the whole process takes 3 to 4 hours. Secondly, after the operation platform is built, the sidewalk is also occupied by the supporting legs, people and materials are difficult to pass through, and the production efficiency is greatly affected. In addition, the mode of building the working platform also has the condition that the rear part of the top beam cannot be constructed.
As shown in fig. 1, the hydraulic support maintenance equipment for a large mining height working face (hereinafter referred to as maintenance equipment) in the embodiment of the invention comprises a lifting device 1 and a working platform 2, wherein the lifting device 1 is used for being installed at a shield beam 3, the lifting device 1 is connected with the working platform 2 and used for lifting the working platform 2 upwards, and the working platform 2 is used for operators to enter and carry out maintenance operation after lifting.
The overhaul equipment provided by the embodiment of the invention is mainly used for overhauling and maintaining the hydraulic support of the large mining height working surface, and the shield beam 3 is the shield beam 3 of the hydraulic support of the large mining height working surface. The hoisting device 1 may be a device having a hoisting function, such as a crane. The lifting device 1 can be pre-installed on the shield beam 3 of each hydraulic support, in other embodiments, only the installation position can be reserved on the shield beam 3, and when maintenance is needed, the lifting device 1 is installed at the installation position of the corresponding hydraulic support, so that the overall arrangement cost can be reduced.
The operation platform 2 can be the structure such as hanging flower basket, hang basket, platform, and operation platform 2 can hang in the below of hoisting device 1, and during the use, operating personnel can get into operation platform 2, then with the help of hoisting device 1 with operation platform 2 lift by crane to corresponding high position can, operating personnel can stand on operation platform 2 and overhaul the operation.
As shown in fig. 2, the work platform 2 includes a bottom plate 21 and a plurality of side plates 22, the plurality of side plates 22 being provided on an outer peripheral side of the bottom plate 21, and at least part of the side plates 22 being swingable with respect to the bottom plate 21 to give the work platform 2 a lifted state and a work state.
During the process of lifting the working platform 2 upwards, the working platform 2 may be switched to a hanging state, at this time, as shown in fig. 2, a plurality of side plates 22 are turned over the bottom plate 21 and enclose an inner cavity 23 above the bottom plate 21, and the inner cavity 23 is used for accommodating an operator during the process of lifting the working platform 2 upwards. Therefore, the plurality of side plates 22 can play a role in protection, so that the condition that an operator falls off the working platform 2 due to shaking and the like in the lifting process is avoided.
When the working platform 2 is lifted to the corresponding height position, the working platform 2 can be switched to the working state by turning over the corresponding side plates 22, at this time, as shown in fig. 3, some of the side plates 22 are also in the horizontal position and are spliced with the bottom plate 21, and the operator can move on the bottom plate 21 and the turned side plates 22, so as to play a role in increasing the working range of the operator.
According to the overhaul equipment provided by the embodiment of the invention, an operator carries out overhaul operation in a lifting mode of the operation platform 2, and the overhaul mode does not occupy the sidewalk of the hydraulic support, namely, people, materials and the like can still pass through the sidewalk in the overhaul process, so that parallel operation in the overhaul process is realized, and the influence on production is reduced.
Secondly, because the operation platform 2 has an operation state, an operator can have a relatively large operation range in the operation state, thereby meeting the use requirement of overhaul at each position and improving the flexibility of the operation of the whole overhaul process.
In some embodiments, the plurality of side plates 22 includes two fixed plates 221 disposed opposite to each other and two movable plates 222 disposed opposite to each other, the fixed plates 221 are fixedly connected to the base plate 21 and located above the base plate 21, the movable plates 222 are rotatably mounted to the base plate 21 so that the work platform 2 can be switched to a lifting state or a work state, and each of the fixed plates 221 is connected to the lifting device 1.
For example, as shown in fig. 3, the work platform 2 may have a substantially square box shape, in which only two fixed plates 221 may be provided, only two movable plates 222 may be provided, the two fixed plates 221 may be arranged opposite each other in the left-right direction, and the two movable plates 222 may be arranged opposite each other in the front-rear direction. Wherein, both fixing plates 221 can be fixedly connected with the bottom plate 21, and the connection mode can be integral casting molding, welding and the like.
The two movable plates 222 can be assembled with the bottom plate 21 through corresponding hinge, when the working platform 2 needs to be switched to a lifting state, the two movable plates 222 can be turned over to the upper side of the bottom plate 21 and fixedly connected with the two fixed plates 221, wherein the movable plates 222 and the fixed plates 221 can be connected in a plugging and fixing manner through pins and the like.
When the work platform 2 needs to be switched to the work state, the fixed connection between the two movable plates 222 and the fixed plate 221 can be released, and then the two movable plates 222 can be turned down, so that the two movable plates 222 can be switched to the position substantially flush with the bottom plate 21.
It should be noted that, when the work platform 2 is switched to the working state, each of the movable plate 222 and the bottom plate 21 may abut against each other, for example, a limiting portion and the like may be disposed on each of the movable plate 222 and the bottom plate 21, so that the movable plate 222 may be maintained in a horizontal position, and a situation of turning transition of the movable plate 222 is avoided.
The two fixed plates 221 can be connected with the lifting device 1, and the two movable plates 222 are not connected with the lifting device 1, so that the situation that the movable plates 222 are easily limited by the connection with the lifting device 1 can be avoided while the use requirement of lifting upwards by the lifting device 1 is met, and the overturning flexibility of the movable plates 222 is ensured.
In some embodiments, as shown in fig. 1, the lifting device 1 comprises a winch 11 for mounting at the shield beam 3 and a lifting rope 12, the lifting rope 12 being wound around the winch 11 and connected to the fixing plate 221. For example, as shown in fig. 4, the winch 11 may be fastened in particular to the interior of the tank of the shield beam 3, and in other embodiments the winch 11 may also be fastened to the side shields on the left and right sides of the shield beam 3. The winch 11 is electric, and when in use, the winch 11 can be driven to rotate in an electric driving mode, so that the lifting rope 12 can be wound up, and the working platform 2 can be lifted up.
In some embodiments, the fixing plate 221 is provided with a plurality of hanger rope holes 2211 and a safety rope hole 2212, the hanger rope holes 2211 being used to connect with the hanger rope 12, and the safety rope hole 2212 being used to connect with the safety rope.
For example, as shown in fig. 3, a plurality of first lugs may be disposed on the fixing plate 221, and one lifting rope hole 2211 may be disposed in each first lug, so that, in use, the lifting rope 12 of the lifting device 1 may be directly passed through the corresponding lifting rope hole 2211 and connected to the corresponding first lug. Thereby facilitating the connection and fixation of the hanger rope 12 and the fixing plate 221.
As shown in fig. 3, the fixing plate 221 may further be provided with a second ear, in which a safety rope hole 2212 may be provided, and in use, one end of the safety rope may be connected to the hydraulic support, and the other end of the safety rope may pass through the installation rope hole and be connected to the second ear, and the safety rope may play a role in pulling the working platform 2 when the working platform 2 accidentally falls, thereby enhancing the safety of the maintenance operation process.
In some embodiments, a plurality of hanger rope holes 2211 and safety rope holes 2212 are provided at the top side of the fixing plate 221, and the safety rope holes 2212 are provided between the two hanger rope holes 2211. For example, as shown in fig. 3, two hanger rope holes 2211 may be provided at front and rear ends of the top side edge of the fixing plate 221, respectively, and the mounting rope hole may be provided only one, and may be located at a middle position of the top side edge of the fixing plate 221. Thereby, the hoist ropes 12 and the safety ropes can be symmetrically distributed, so that the structural stability of the work platform 2 in use can be enhanced.
In some embodiments, there are two lifting devices 1, and the two lifting devices 1 are used for being arranged at intervals along the width direction of the shield beam 3, and a plurality of lifting rope holes 2211 of the same fixing plate 221 are connected with the lifting ropes 12 of the same lifting device 1.
For example, as shown in fig. 4, two winches 11 of the lifting device 1 may be respectively fixed to the left and right side cases of the shield beam 3, wherein the winch 11 on the left side may draw out two lifting ropes 12 and may be respectively connected to the two lifting rope holes 2211 of the fixing plate 221 on the left side, and the winch 11 on the right side may draw out two lifting ropes 12 and may be respectively connected to the two lifting rope holes 2211 of the fixing plate 221 on the right side. Thereby ensuring the stability of the lifting of the working platform 2.
In some embodiments, the moveable plate 222 is provided with a fixed cord hole 2221, the fixed cord hole 2221 being configured to couple with a fixed cord in the operational state. For example, as shown in fig. 3, two third ears may be integrally formed on the edge of the movable plate 222 opposite to the hinge position, and two third ears may be respectively located at the left side and the right side of the movable plate 222, and a fixing rope hole 2221 may be provided in each third ear.
When the hydraulic support is used, one end of the fixing rope can be connected with the hydraulic support, the fixing rope can be connected with the upright post and the shield beam 3 through the binding bands and the like, and the other end of the fixing rope can penetrate through the fixing rope holes 2221 and be connected with the corresponding third lug parts. The fixed rope can play a role of pulling the movable plate 222, so that the structural stability of the operation platform 2 in an operation state is ensured, and the whole bearing capacity is enhanced.
In some embodiments, as shown in fig. 3, two fixed plates 221 are arranged opposite to each other in the width direction (left-right direction) of the shield beam 3, and two movable plates 222 are arranged opposite to each other in a direction orthogonal to the width direction. Therefore, the operation platform 2 is in a symmetrical structure in both the lifting state and the operation state, thereby ensuring the overall structural stability.
In some embodiments, as shown in fig. 3, the bottom plate 21 has a rectangular shape, the fixed plate 221 is connected to a short side of the bottom plate 21, and the movable plate 222 is connected to a long side of the bottom plate 21. Therefore, the working platform 2 is of a cuboid structure, so that operators can have a larger working range in the front-back direction of the hydraulic support, and the large matching requirement of the front-back direction space in the hydraulic support can be fully met.
In some embodiments, as shown in fig. 3, a plurality of through holes 2213 are uniformly distributed on the fixing plate 221. Thereby, on the one hand, the weight reduction effect can be achieved, and on the other hand, the tool fixing device can also be used for fixing tools.
In some embodiments, the service apparatus comprises a plurality of legs, as shown in fig. 5, the underside of the base plate 21 being provided with a plurality of sleeves 211, the legs being secured within the sleeves 211 in the operative condition and the legs being for supporting the work platform 2. Specifically, when a welding gun or a jack is required to be used on the working platform 2 for working, the supporting legs can be installed at the corresponding sleeve 211, and the supporting of the working platform 2 can be realized by the supporting legs, so that the bearing capacity of the working platform 2 can be enhanced.
The following describes the method of maintenance according to the embodiment of the present invention.
The overhauling method of the embodiment of the invention comprises the following steps:
s1, switching the working platform 2 to a hoisting state and connecting the working platform with the hoisting device 1. For example, the two movable plates 222 of the work platform 2 may be turned upward and fixed to the fixed plates 221, and then the hoist rope 12 of the hoist 1 may be connected and fixed to the hoist rope hole 2211 of the corresponding fixed plate 221.
S2, lifting the working platform 2 upwards through the lifting device 1. Specifically, after an operator enters the working platform 2, the winch 11 of the lifting device 1 can be driven to rotate in an electric driving mode, and the lifting of the working platform 2 can be achieved through winding of the lifting rope 12.
And S3, switching the operation platform 2 to an operation state after the operation platform 2 is lifted to a set position. For example, after the work platform 2 is lifted to a position (set position) close to the shield beam 3, the operator on the work platform 2 may flip the two movable plates 222 to both sides, specifically, a distance of about 2 meters from the top beam to satisfy the construction requirement.
And S4, connecting the safety rope with the working platform 2, and connecting the fixing rope with the overturned side plate 22. Specifically, after both the movable plates 222 are turned outwards, the safety rope is connected to the safety rope hole 2212, and the fixing rope is connected to the fixing rope hole 2221.
And S5, finishing maintenance operation on the operation platform 2.
A specific example of the service apparatus of the embodiment of the present invention is described below.
The left and right side plates (which can be regarded as a fixed plate 221) and the bottom plate 21 are welded to form a base, the front side plate and the rear side plate (which can be regarded as a movable plate 222) are fixed on the base through hinge joints, the front side plate and the rear side plate are retracted in a normal state, and the basket (which can be regarded as a working platform 2) is rectangular. Electric winches are welded at appropriate positions (depending on the support height) of the left and right side tanks of the shield beam 3, and two lifting ropes 12 can be led out from each winch 11.
When the maintenance work is carried out, the winch 11 is operated to put down the lifting ropes 12, the four lifting ropes 12 are respectively fixed on the four lifting rope holes 2211 on the left side plate and the right side plate, and after workers and equipment enter the hanging basket, the safety ropes are fixed in the safety rope holes 2212. The hanging basket is hung to a proper height by operating the winch 11, the front side plate and the rear side plate are opened and flattened to form a platform with the thickness of 2000mm multiplied by 1320mm, and after a fixed rope passes through 4 fixed rope holes 2221, the fixed rope is connected with a support stand column clamp, a shield beam 3 hanging ring and the like to ensure the stability of the operation platform 2. If welding, pin pulling and other works are needed, the 4 sleeves 211 are connected by the supporting legs, and the platform is erected on the support sidewalk to further stabilize the platform.
By adopting the structure, the winch 11-hanging basket mechanism is arranged on the shield beam 3, so that maintenance work of the rear part of the top beam of the hydraulic support of the ultra-large mining height working face and the upper part of the shield beam 3 is realized, additional manual operation is saved, and the working efficiency is improved.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, or communicable with each other, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interactive relationship between two elements, unless otherwise explicitly specified. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the invention.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411650983.3A CN119528063A (en) | 2024-11-18 | 2024-11-18 | Large mining height working face hydraulic support overhauling equipment and overhauling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411650983.3A CN119528063A (en) | 2024-11-18 | 2024-11-18 | Large mining height working face hydraulic support overhauling equipment and overhauling method |
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| CN119528063A true CN119528063A (en) | 2025-02-28 |
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| CN202411650983.3A Pending CN119528063A (en) | 2024-11-18 | 2024-11-18 | Large mining height working face hydraulic support overhauling equipment and overhauling method |
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| CN (1) | CN119528063A (en) |
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