A stop device and method thereof

Abstract

The application discloses the technical field of bucket wheel machine carriage limiting, and particularly relates to a limiting device and a method thereof, which comprises a carriage, a limiting component, a positioning assembly and a connecting assembly, the positioning assembly is arranged on the carriage, the connecting assembly limits the distance between the front carriage and the rear carriage by connecting the positioning assembly, in the existing bucket wheel machine technology, the tail carriage limiting function in the process of changing the carriage is not arranged, and the reliability is not high due to the electric limiting, once the tail carriage slips or the electric limiting fails in the process of changing the carriage, the bucket wheel machine electric and mechanical parts will be seriously damaged, and the repair time and difficulty are increased. The mechanical limiting device arranged on the front carriage and the rear carriage effectively solves the problems of electric limiting failure and tail carriage displacement caused by external force, reliably limits the limit distance of the front carriage and the tail carriage in the separated state, and guarantees the safety of the bucket wheel machine in the process of changing the carriage.

Description

Technical Field

[0001] This invention relates to the technical field of limiting the carriage of a bucket wheel excavator, and more particularly to a limiting device and method thereof. Background Technology

[0002] Bucket wheel stacker-reclaimers are widely used in coal yards of thermal power plants. Their main function is to excavate coal from the yard and load it onto conveyor belts. Bucket wheel stackers are highly efficient devices capable of continuous loading and unloading of bulk materials. Particularly in power plants, they are responsible for the stacking and reclaiming of coal stored in the coal yard. The rotating bucket wheel retrieves material from the storage yard, classifying and storing different types of coal, which is then transported to various generating units via conveyors to provide fuel for power generation. This equipment plays a crucial role in coal-fired power plants, serving as an important component for coal unloading, coal storage in the coal conveying system, and coal loading. Failures in bucket wheel stackers directly affect the normal operation of the coal conveying system's stacking and reclaiming processes. If a serious malfunction occurs and the impact is prolonged, it will directly affect the load on the generating units.

[0003] Bucket wheel excavators have two operating modes: stacking and reclaiming. During the transition between these modes, the excavator needs to be repositioned. At this time, the powered front car and the unpowered rear car will disengage. After the mode transition, the front and rear cars will reconnect. During the mode transition, the rear car may slip after the front and rear cars have disengaged, exceeding the limit distance between them. This can cause excessive stretching of the telescopic chain links, leading to stress on the cables. In severe cases, the telescopic chain links may be damaged, the cables may break, and the bucket wheel excavator may experience serious malfunctions.

[0004] Currently, bucket wheel excavators rely on electrical limit switches during the shifting process. When the lead and tail cars of the excavator separate to a certain distance, the telescopic chain link, during its extension, contacts the limit switch, sending a signal to the excavator's central control system that the lead car has reached its destination, and the excavator stops moving the lead car. This method only works when the electrical system is functioning normally and the tail car remains stationary after separation. However, during the shifting process, if the tail car is displaced by external forces, the lead car's telescopic chain link may cross the electrical limit switch, causing it to malfunction. This releases the power circuit lockout of the lead car, allowing it to continue moving forward after being powered on. Consequently, the telescopic chain link continues to be stressed, potentially leading to chain link damage or cable breakage.

[0005] A review of existing literature revealed no solution to the problem of the tail car slipping during the changeover process of the bucket wheel excavator. Therefore, it is necessary to solve the problem of limiting the tail car of the bucket wheel excavator to ensure the safety of the bucket wheel excavator when changing its operating mode. Summary of the Invention

[0006] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0007] In view of the problem that the tail car of the existing bucket wheel excavator slips during the change of car, resulting in the telescopic chain link continuing to be stressed and causing chain link damage or cable breakage, the present invention is proposed.

[0008] Therefore, the purpose of this invention is to provide a limiting device.

[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a carriage, including a front carriage and a rear carriage; a limiting component, including a positioning component and a connecting component, wherein the positioning component is disposed on the carriage, and the connecting component limits the distance between the front carriage and the rear carriage by connecting the positioning component.

[0010] In a preferred embodiment of the limiting device of the present invention, the positioning component includes a first positioning element and a second positioning element, the first positioning element and the second positioning element being respectively disposed on the front compartment and the rear compartment.

[0011] In a preferred embodiment of the limiting device of the present invention, the connecting component includes a first connecting member and a second connecting member, both of which are used to connect the first positioning member and the second positioning member.

[0012] In a preferred embodiment of the limiting device of the present invention, the first positioning member includes a first positioning block, the number of the first positioning blocks is greater than or equal to 1, and the first positioning block is used to fix the first connecting member to the front compartment.

[0013] In a preferred embodiment of the limiting device of the present invention, the second positioning member is disposed in the rear compartment, the second positioning member includes a first fixing block, the side of the first fixing block that contacts the first connecting member is provided with a groove, and the first connecting member can move along the groove on the first fixing block.

[0014] In a preferred embodiment of the limiting device of the present invention, the first connecting member is made of rigid material, one end of the first connecting member is fixed to the front compartment by the first positioning member, and the other end of the first connecting member is adapted to the groove of the second positioning member.

[0015] In a preferred embodiment of the limiting device of the present invention, the first positioning member includes a fixed shaft, the fixed shaft is disposed on the front carriage, and an electric drum is disposed on the fixed shaft.

[0016] In a preferred embodiment of the limiting device of the present invention, the second positioning member is disposed in the rear compartment, and the second positioning member includes a second fixing block.

[0017] In a preferred embodiment of the limiting device of the present invention, the second connecting member is made of a flexible material, one end of the second connecting member is wrapped around the surface of the electric drum, the other end of the second connecting member is connected to the second fixing block, and the maximum length of the second connecting member connecting the fixing shaft and the second fixing block is the limit distance between the front compartment and the rear compartment.

[0018] To address the aforementioned problems, the present invention also provides a limiting method: including a limiting device, and further including a first positioning member on the front carriage, the first positioning member including at least one first positioning block; then a first fixing block on the rear carriage, the side of the first fixing block in contact with the first connecting member having a groove; the first connecting member is made of rigid material, one end of which is fixed to the front carriage by the first positioning block, and the other end is adapted to the groove on the first fixing block; during the change of carriage of the bucket wheel excavator, when the electrical limit fails or the tail car is displaced due to external force, the first connecting member moves along the groove on the first fixing block to maintain the limit distance between the front and rear carriages, preventing the telescopic chain links and cables from being damaged due to excessive stretching.

[0019] The beneficial effects of this invention: Existing bucket wheel excavator technology lacks a tail car limit function during the shifting process, relying on electrical limiters which suffer from unreliability. If the tail car slips or the electrical limiter fails during the shifting process, it will cause serious damage to the electrical and mechanical components of the bucket wheel excavator, increasing repair time and difficulty. This invention effectively solves the problems of electrical limiter failure and tail car displacement due to external forces by setting mechanical limit devices on the front and rear cars. It reliably limits the extreme distance between the front and rear cars in the separated state, ensuring the safety of the bucket wheel excavator during the shifting process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the usage state of the limiting device of the present invention. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the usage state of the limiting device of the present invention. Figure 2 .

[0022] Figure 3 Schematic diagram of the limiting component of the limiting device of the present invention Figure 1 .

[0023] Figure 4 Schematic diagram of the limiting component of the limiting device of the present invention Figure 2 .

[0024] In the diagram: 100, carriage; 101, front carriage; 102, rear carriage; 200, limiting component; 201, positioning component; 202, connecting component; 202a, first connecting member; 202b, second connecting member; 203, first positioning member; 203a, first positioning block; 203b, electric drum; 204, second positioning member; 204a, first fixing block; 204b, second fixing block. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0028] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0029] Example 1 Reference Figure 1 and Figure 3This is the first embodiment of the present invention, which provides a limiting device, including a carriage 100, including a front carriage 101 and a rear carriage 102; a limiting component 200, including a positioning component 201 and a connecting component 202. The positioning component 201 is disposed on the carriage 100, and the connecting component 202 limits the distance between the front carriage 101 and the rear carriage 102 by connecting the positioning component 201. It should be noted that there are two sets of limiting components 200, which are mirror images of each other with the central axis of the carriage 100 as the center.

[0030] Specifically, the positioning component 201 includes a first positioning element 203 and a second positioning element 204, which are respectively disposed on the front compartment 101 and the rear compartment 102.

[0031] Furthermore, the connecting component 202 includes a first connector 202a and a second connector 202b, both of which are used to connect the first positioning member 203 and the second positioning member 204.

[0032] It should be noted that the current bucket wheel excavator relies on electrical limit switches during the vehicle shifting process. When the lead and tail cars of the excavator separate to a certain distance, the telescopic chain link, during its extension, touches the limit switch, sending a signal to the excavator's central control system that the lead car has reached its destination, and the excavator stops the lead car's movement. This method only works when the electrical system is functioning normally and the tail car remains stationary after separation. However, during the shifting process, if the tail car is displaced by external forces, the lead car's telescopic chain link may cross the electrical limit switch, causing the electrical limit switch to malfunction. This releases the power circuit lock of the lead car, allowing it to continue moving forward after being powered on, resulting in continued stress on the telescopic chain link, potentially leading to chain link damage or cable breakage. The following are experimental data from the field: Taking the process of changing the bucket wheel excavator on site, where the distance between the front and rear cars is 3 meters, as an example, the distance between the rolling pulley and the edge of the limiting slide is set to 0.2 meters, that is, the limit of the distance between the front and rear cars is 3.2 meters. The bucket wheel excavator's traveling track is 200 meters long. By performing the changing operation at different positions on the traveling track, a total of 100 times are carried out, that is, changing the material stacking and retrieving methods, the number of times the rear car slips is counted, and the limiting distance of the rear car limiting device is recorded.

[0033] The experimental data are shown in Table 1: Table 1. Tail car slippage during bucket wheel excavator rollover process.

[0034] Table 1 shows that during 100 changes of position of the bucket wheel excavator, slippage occurred 6 times. The tail car limit device functioned in all of these instances, with a limit distance of 3.2 meters. In these 6 slippage instances, the electrical limit switch was overrun due to mechanical displacement, and thus failed to function.

[0035] Therefore, our invention can effectively solve this problem by setting limiting components 200 in the front compartment 101 and the rear compartment 102.

[0036] Example 2 Reference Figure 1 and Figure 3 The difference between this embodiment and the first embodiment is that the first positioning member 203 includes a first positioning block 203a, the number of first positioning blocks 203a is greater than or equal to 1, and the first positioning block 203a is used to fix the first connecting member 202a to the front compartment 101.

[0037] Specifically, the second positioning member 204 is disposed in the rear compartment 102. It is worth noting that the second positioning member 204 can also be disposed in the front compartment 101, as long as the same technical effect as in this embodiment can be achieved. The second positioning member 204 includes a first fixing block 204a. The side of the first fixing block 204a that contacts the first connecting member 202a is provided with a groove. The first connecting member 202a can move along the groove on the first fixing block 204a. It is worth noting that the first fixing block 204a can be a cylinder or an elliptical cylinder, as long as the outer edge of the fixing block matches the curvature of the first connecting member 202a.

[0038] Furthermore, the first connector 202a is made of rigid material. One end of the first connector 202a is fixed to the front compartment 101 by the first positioning member 203, and the other end of the first connector 202a is adapted to the groove of the second positioning member 204.

[0039] The rest of the structure is the same as in Example 1.

[0040] Operating procedure: Based on the limit distance of the separation between the front and rear cars during the bucket wheel excavator's car-changing process, determine the installation positions of the first positioning component 203 and the second positioning component 204, as well as the length of the first connecting component 202a. Figure 1 The first connecting member 202a in this invention is fixed to the front carriage 101 by a plurality of first positioning blocks 203a, and one is installed on each side of the tail carriage of the bucket wheel excavator.

[0041] A first fixing block 204a is installed in the rear compartment 102 of the bucket wheel excavator. The edge of the first fixing block 204a is grooved to ensure that the part of the first connecting piece 202a located in the rear compartment 102 can move along the groove of the first fixing block 204a.

[0042] It should be noted that during the shifting process of the bucket wheel excavator, an electrical limit switch controls the distance between the front and rear vehicles. When the front and rear vehicles separate to the electrical limit switch position, the front vehicle stops running. When the electrical limit switch fails, the portion of the first connecting piece 202a located in the rear compartment 102 slides along the groove of the first fixing block 204a. The distance between the two ends of the first connecting piece 202a is the limit distance between the front and rear compartments 102. When the rear compartment 102 slides backward due to external force, the front compartment 101 and the rear compartment 102 will not exceed the limit distance, thereby protecting the telescopic chain links and cables between the front compartment 101 and the rear compartment 102 from being pulled and broken by external force.

[0043] In this embodiment, the limiting component 200 is arranged on both sides of the bucket wheel excavator to ensure that the front and rear carriages do not deviate from their original positions. The reason for making the first connecting member 202a a rigid material in this embodiment is that in some operating scenarios of the bucket wheel excavator, the front carriage 101 and the rear carriage 102 are simultaneously on a straight track, without facing turning or cornering. Therefore, the first connecting member 202a is made of a rigid material. Specifically, the first connecting member 202a can be as follows: Figure 1 The shapes shown are not limited to Figure 1 The shape shown can be any shape that achieves the technical effect described in this embodiment.

[0044] Example 3 Reference Figure 2 and Figure 4 This embodiment differs from the previous embodiments in that the first positioning member 203 includes a fixed shaft, which is mounted on the front carriage 101. An electric drum 203b is mounted on the fixed shaft. It should be noted that the electric drum 203b can be controlled by a frequency converter or other switches to ensure that the winding and unwinding speed matches the speed of the front carriage and to prevent the wire rope from bending too much and falling to the ground.

[0045] Specifically, the second positioning member 204 is disposed in the rear compartment 102. It is worth noting that the second positioning member 204 can also be disposed in the front compartment 101, as long as the same technical effect as this embodiment can be achieved. The second positioning member 204 includes a second fixing block 204b.

[0046] Furthermore, the second connector 202b is made of a flexible material. One end of the second connector 202b is wrapped around the surface of the electric drum 203b, and the other end of the second connector 202b is connected to the second fixing block 204b. The maximum length between the second connector 202b connecting the fixing shaft and the second fixing block 204b is the limit distance between the front carriage 101 and the rear carriage 102. The second connector 202b can be a wire rope or a chain, etc.

[0047] The rest of the structure is the same as in Example 2.

[0048] Operation process: In this embodiment, a flexible connection method is adopted between the front and rear carriages of the bucket wheel excavator. Based on the limit distance of the separation between the front and rear carriages during the change of carriages of the bucket wheel excavator, the installation positions of the first positioning component 203 and the second positioning component 204 and the length of the second connecting component 202b are determined. Figure 4 In this invention, a fixed shaft is installed on the front carriage 101, an electric drum 203b is installed on the fixed shaft, and one end of the second connector 202b is fixedly connected to the electric drum 203b.

[0049] Then, a second fixing block 204b is installed in the rear compartment 102, and the other end of the second connecting piece 202b is fixed to the second fixing block 204b. By connecting the electric drum 203b to one end of the second connecting piece 202b, during the bucket wheel excavator's vehicle changeover process, when the front compartment 101 and the rear compartment 102 separate, the electric drum 203b is synchronously driven to rotate and release the second connecting piece 202b. The rotation speed is synchronized with the movement of the front vehicle. When the separation reaches the electrical limit position, the front vehicle stops running. At this time, the unreleased length of the second connecting piece 202b should be 0.2 meters. When the electrical limit fails, the second connecting piece 202b will be in a taut state after releasing the remaining 0.2 meters. At this time, the tail vehicle and the front vehicle will not exceed the limit distance, thus protecting the telescopic chain link and cable from external pulling and breakage. Figure 4 As shown.

[0050] During the change of vehicle in the bucket wheel excavator, when the front vehicle is connected to the rear vehicle, the synchronously driven electric drum 203b rotates in the opposite direction to retract the second connecting piece 202b. The retraction speed is synchronized with the backward speed of the front vehicle. After the front vehicle retracts and connects with the rear vehicle, the electric drum 203b stops retracting the rope.

[0051] It should be noted that during the shifting process of the bucket wheel excavator, an electrical limit switch controls the distance between the front and rear vehicles. When the front and rear vehicles separate to the electrical limit switch position, the front vehicle stops running. When the electrical limit switch fails, the rear vehicle slips. During the slippage of the rear vehicle, the second connecting piece 202b releases the remaining 0.2 meters and then enters a taut state. At this time, the rear vehicle and the front vehicle will not exceed the limit distance, thus protecting the telescopic chain link and cable from being pulled and broken by external forces.

[0052] In this embodiment, the limiting component 200 is arranged on both sides of the bucket wheel excavator to ensure that the front and rear carriages do not deviate from their original positions. The reason for using a flexible material for the second connecting member 202b in this embodiment is that in some operating scenarios of the bucket wheel excavator, the front carriage 101 and the rear carriage 102 are not on a straight track and may face turning or cornering. Therefore, the second connecting member 202b is made of a flexible material. Specifically, the second connecting member 202b can be as follows: Figure 4 The shapes shown are not limited to Figure 4 The shape shown can be any shape that achieves the technical effect described in this embodiment.

[0053] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0054] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0055] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A limiting device, characterized in that: include, The carriage (100) includes a front carriage (101) and a rear carriage (102). The limiting component (200) includes a positioning component (201) and a connecting component (202), wherein the positioning component (201) is disposed on the carriage (100), and the connecting component (202) limits the distance between the front carriage (101) and the rear carriage (102) by connecting the positioning component (201); The positioning component (201) includes a first positioning element (203) and a second positioning element (204), which are respectively disposed on the front compartment (101) and the rear compartment (102); The connecting component (202) includes a first connector (202a) and a second connector (202b), both of which are used to connect the first positioning component (203) and the second positioning component (204). The first positioning member (203) includes a first positioning block (203a), the number of the first positioning blocks (203a) is greater than or equal to 1, and the first positioning block (203a) is used to fix the first connecting member (202a) to the front compartment (101). The second positioning member (204) is disposed in the rear compartment (102). The second positioning member (204) includes a first fixing block (204a). The side of the first fixing block (204a) that contacts the first connecting member (202a) is provided with a groove. The first connecting member (202a) can move along the groove on the first fixing block (204a). The first connector (202a) is made of rigid material. One end of the first connector (202a) is fixed to the front compartment (101) through the first positioning member (203), and the other end of the first connector (202a) is adapted to the groove of the second positioning member (204). The first positioning component (203) includes a fixed shaft, which is disposed on the front compartment (101), and an electric drum (203b) is disposed on the fixed shaft. The second positioning element (204) includes a second fixing block (204b); The second connector (202b) is made of flexible material. One end of the second connector (202b) is wrapped around the surface of the electric drum (203b), and the other end of the second connector (202b) is connected to the second fixing block (204b). The maximum length between the second connector (202b) connecting the fixing shaft and the second fixing block (204b) is the limit distance between the front compartment (101) and the rear compartment (102).

2. A limiting method, characterized in that: Including the limiting device as described in claim 1, it further includes, A first positioning element (203) is provided on the front compartment (101), the first positioning element (203) including at least one first positioning block (203a); Then a first fixing block (204a) is set on the rear compartment (102), and a groove is provided on the side of the first fixing block (204a) that contacts the first connector (202a); The first connector (202a) is made of rigid material. One end of it is fixed to the front compartment (101) by the first positioning block (203a), and the other end is adapted to the groove on the first fixing block (204a). During the change of the bucket wheel excavator, when the electrical limit switch fails or the tail car is displaced by external force, the first connecting piece (202a) moves along the groove on the first fixed block (204a) to maintain the limit distance between the front car body (101) and the rear car body (102) and prevent the telescopic chain links and cables from being damaged due to excessive stretching. When the connecting assembly (202) adopts a second connector (202b) made of flexible material, a fixed shaft with an electric drum (203b) is set on the front carriage (101), and a second fixed block (204b) is set on the rear carriage (102). One end of the second connector (202b) is wrapped around the surface of the electric drum (203b), and the other end is connected to the second fixed block (204b). During the change of the bucket wheel excavator, the electric drum (203b) is used to release the second connector (202b) to its maximum length and then tighten it to maintain the limit distance between the front carriage (101) and the rear carriage (102).

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