Limiting device and method thereof

Abstract

The invention belongs to the technical field of bucket wheel machine compartment limiting, and particularly relates to a limiting device and a method thereof. The limiting component comprises a positioning assembly and a connecting assembly, the positioning assembly is arranged on the compartment, the connecting assembly limits the distance between the front compartment and the rear compartment by connecting the positioning assembly, and the problem that in the existing bucket wheel machine technology, the tail car limiting function in the car changing process is not set, and the reliability is not high due to electric limiting is solved. Once a tail car slides or electrical limiting fails in the car changing process, electrical and mechanical parts of a bucket wheel machine are seriously damaged, and the repair time and difficulty are increased. The problems of electrical limiting failure and displacement of the tail car due to external force are effectively solved by arranging mechanical limiting devices on the front car and the rear car, the limiting distance of the front car and the tail car of the bucket wheel machine in the separated state is reliably limited, and the safety of the bucket wheel machine in the car changing process is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of bucket wheel crane carriage limiting, and in particular to a limiting device and a method thereof. Background Art

[0002] Bucket wheel stacker and reclaimer is widely used in coal yards of thermal power plants. The main function of bucket wheel machine in thermal power plants is to dig coal from the coal yard onto the conveyor belt. Bucket wheel machine is a highly efficient equipment that can continuously load and unload bulk materials. Especially in power generation enterprises, it is responsible for the stacking and reclaiming of coal yard storage. The rotating bucket wheel takes materials from the storage yard, classifies and stores different types of coal, and then transports them to each unit through the conveyor to provide fuel for power generation. This equipment plays a vital role in coal-fired power plants. It is an important equipment for coal loading and unloading, coal storage and coal loading in the coal transportation system. The failure of the bucket wheel machine will directly affect the normal operation of the coal transportation system. If a serious failure occurs and the impact time is long, it will directly affect the load of the unit.

[0003] Bucket wheel excavators have two working modes: stacking and retrieving. In the process of switching between the two working modes, the bucket wheel excavator needs to change position. At this time, the powered front car and the unpowered rear car of the bucket wheel excavator will be disconnected. After the working mode is changed, the front car and the rear car will be connected again. After the front car and the rear car are disconnected, the rear car may slip during the process of changing the working mode, and the distance from the front car may exceed the limit distance, resulting in excessive stretching of the telescopic chain links, causing stress on the cable. In severe cases, the telescopic chain links will be damaged, the cable will be broken, and the bucket wheel excavator will have serious malfunctions.

[0004] The existing bucket wheel excavator relies on electrical limit switches during the vehicle change process. When the front vehicle and the rear vehicle of the bucket wheel excavator are separated to a certain distance, the telescopic chain touches the limit switch during stretching, and sends a signal to the central control system of the bucket wheel excavator that the front vehicle has reached its position, and the bucket wheel excavator stops the front vehicle from moving. This method can only play a limiting role when the electrical system works normally and the rear vehicle does not move after being separated. However, during the vehicle change process, the rear vehicle is displaced by external forces, and the telescopic chain of the front vehicle will cross the electrical limit switch, causing the electrical limit to fail, and the power circuit of the front vehicle of the bucket wheel excavator is unlocked. The front vehicle can continue to move forward after receiving power, which causes the telescopic chain to continue to be stressed, resulting in chain damage or cable breakage.

[0005] After reviewing the existing literature, no solution was found for the problem of the bucket wheel machine's tail car slipping during the gear change process. Therefore, it is necessary to solve the problem of the bucket wheel machine's tail car limiting to ensure the safety of the bucket wheel machine's changing working mode. Summary of the invention

[0006] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] The present invention is proposed in view of the problem that the tail car of the conventional bucket wheel machine slips during the car change process, thereby causing the telescopic chain link to continue to be stressed, resulting in chain link damage or cable breakage failure.

[0008] Therefore, an object of the present invention is to provide a limiting device.

[0009] To solve the above technical problems, the present invention provides the following technical solutions: a carriage, comprising a front carriage and a rear carriage; a limiting component, comprising a positioning component and a connecting component, the positioning component being arranged on the carriage, and the connecting component limiting the distance between the front carriage and the rear carriage by connecting the positioning component.

[0010] As a preferred solution of the limiting device of the present invention, the positioning assembly includes a first positioning member and a second positioning member, and the first positioning member and the second positioning member are respectively arranged on the front compartment and the rear compartment.

[0011] As a preferred solution of the limiting device of the present invention, the connecting assembly includes a first connecting member and a second connecting member, and the first connecting member and the second connecting member are both used to connect the first positioning member and the second positioning member.

[0012] As a preferred solution of the limiting device of the present invention, wherein: 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] As a preferred solution of the limiting device described in the present invention, wherein: the second positioning member is arranged in the rear compartment, the second positioning member includes a first fixed block, a groove is provided on the side of the first fixed block in contact with the first connecting member, and the first connecting member can move along the groove on the first fixed block.

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

[0015] As a preferred solution of the limiting device of the present invention, wherein: the first positioning member includes a fixed shaft, the fixed shaft is arranged on the front carriage, and an electric reel is arranged on the fixed shaft.

[0016] As a preferred solution of the limiting device of the present invention, wherein: the second positioning member is arranged in the rear compartment, and the second positioning member includes a second fixing block.

[0017] As a preferred solution of the limiting device described in the present invention, the second connecting member is made of flexible material, one end of the second connecting member is wrapped around the surface of the electric reel, the other end of the second connecting member is connected to the second fixed block, and the maximum length between the second connecting member connecting the fixed axis and the second fixed block is the limit distance between the front compartment and the rear compartment.

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

[0019] Beneficial effects of the present invention: In the existing bucket wheel machine technology, there is no rear car limit function during the car change process, and the electrical limit has the problem of low reliability. Once the rear car slips or the electrical limit fails during the car change process, the electrical and mechanical parts of the bucket wheel machine will be seriously damaged, and the repair time and difficulty will increase. The present invention effectively solves the problems of electrical limit failure and displacement of the rear car by external force by setting mechanical limit devices on the front car and the rear car, and reliably limits the limit distance between the front car and the rear car of the bucket wheel machine in the separated state, ensuring the safety of the bucket wheel machine during the car change process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0021] Figure 1 Schematic diagram of the use of the limiting device of the present invention Figure 1.

[0022] Figure 2 Schematic diagram of the use of the limiting device of the present invention Figure 2 .

[0023] Figure 3 Schematic diagram of the limiting component of the limiting device of the present invention Figure 1 .

[0024] Figure 4 Schematic diagram of the limiting component of the limiting device of the present invention Figure 2 .

[0025] In the figure: 100, carriage; 101, front carriage; 102, front carriage; 200, limiting component; 201, positioning assembly; 202, connecting assembly; 202a, first connecting member; 202b, second connecting member; 203, first positioning member; 203a, first positioning block; 203b, electric reel; 204, second positioning member; 204a, first fixing block; 204b, second fixing block. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] 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 term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0030] Example 1

[0031] Reference Figure 1 and Figure 3, which is the first embodiment of the present invention, 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 arranged 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 the limiting component 200 is provided with two groups, which are mirror-imaged with the central axis of the carriage 100 as the center.

[0032] Specifically, the positioning assembly 201 includes a first positioning member 203 and a second positioning member 204 , and the first positioning member 203 and the second positioning member 204 are respectively disposed on the front compartment 101 and the rear compartment 102 .

[0033] Furthermore, the connecting assembly 202 includes a first connecting member 202a and a second connecting member 202b, and the first connecting member 202a and the second connecting member 202b are both used to connect the first positioning member 203 and the second positioning member 204.

[0034] It should be noted that, since the existing bucket wheel excavator relies on electrical limit switches during the vehicle change process, when the front vehicle and the rear vehicle of the bucket wheel excavator are disengaged to a certain distance, the telescopic chain touches the limit switch during stretching, and sends a signal to the central control system of the bucket wheel excavator that the front vehicle has reached its position, and the bucket wheel excavator stops the front vehicle from moving. This method can only play a limiting role when the electrical system works normally and the rear vehicle does not move after being disengaged. However, during the vehicle change process, the rear vehicle is displaced by external forces, and the telescopic chain of the front vehicle will cross the electrical limit switch, causing the electrical limit to fail, and the power circuit of the front vehicle of the bucket wheel excavator is unlocked. The front vehicle can continue to move forward after being powered on, causing the telescopic chain to continue to be stressed, resulting in chain damage or cable breakage. The following is the on-site experimental data:

[0035] Taking the process of changing vehicles of bucket wheel excavator on site, where the distance between the front vehicle and the rear vehicle is 3 meters as an example, the edge of the rolling pulley and the limit slideway is set to 0.2 meters, that is, the maximum distance between the front vehicle and the rear vehicle is 3.2 meters. The bucket wheel excavator driving track is 200 meters long. By performing vehicle changing operations at different positions of the driving track for a total of 100 times, that is, changing the stacking and retrieving methods, the number of times the rear vehicle slips, and the limit distance of the rear vehicle limit device are counted.

[0036] The test data are shown in Table 1:

[0037] Table 1 The tail car slipping during bucket wheel excavator shifting

[0038]

[0039] From Table 1, the bucket wheel excavator performed 100 gear-changing operations at different positions, and the gear slipped 6 times. The tail gear limit device played a limiting role, and the limiting distance was 3.2 meters. During these 6 gear-slipping processes, the electrical limit switch was exceeded due to mechanical displacement, and could not play a limiting role.

[0040] Therefore, our invention can effectively solve this problem by setting limiting components 200 in the front and rear compartments 102.

[0041] Example 2

[0042] Reference Figure 1 and Figure 3 This embodiment is different from the first embodiment in that: the first positioning member 203 includes a first positioning block 203a, the number of the first positioning block 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.

[0043] Specifically, the second positioning member 204 is arranged in the rear compartment 102. It is worth noting that the second positioning member 204 can also be arranged in the front compartment 101, as long as the same technical effect as the present embodiment can be achieved. The second positioning member 204 includes a first fixed block 204a. A groove is provided on the side of the first fixed block 204a that contacts the first connecting member 202a. The first connecting member 202a can move along the groove on the first fixed block 204a. It is worth noting that the first fixed block 204a can be a cylinder, an elliptical cylinder or the like, as long as the outer edge of the fixed block matches the curvature of the first connecting member 202a.

[0044] Furthermore, the first connecting member 202a is made of a rigid material, one end of the first connecting member 202a is fixed to the front compartment 101 through the first positioning member 203 , and the other end of the first connecting member 202a is matched with the groove of the second positioning member 204 .

[0045] The rest of the structure is the same as that of Example 1.

[0046] Operation process: According to the limit distance of the front vehicle and the rear vehicle being separated during the bucket wheel excavator shifting process, the installation positions of the first positioning member 203 and the second positioning member 204 and the length of the first connecting member 202a are determined. Figure 1 The first connecting member 202a in the present invention is fixed to the front carriage 101 through a plurality of first positioning blocks 203a, one of which is installed on each side of the bucket wheel machine tail car.

[0047] A first fixing block 204a is installed on the rear compartment 102 of the bucket wheel excavator. The edge of the first fixing block 204a is in a groove shape, ensuring that the portion of the first connecting member 202a located in the rear compartment 102 can move along the groove of the first fixing block 204a.

[0048] It should be noted that during the vehicle changing process of the bucket wheel excavator, an electrical limit is used to control the distance between the front vehicle and the rear vehicle. When the front vehicle and the rear vehicle are separated to the electrical limit position, the front vehicle stops running; when the electrical limit fails, the part of the first connecting member 202a located in the rear compartment 102 slides along the groove of the first fixed block 204a, and the distance between the two ends of the first connecting member 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 and rear compartments 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 broken by external force.

[0049] In this embodiment, the limiting component 200 is arranged on both sides of the bucket wheel machine to ensure that the front car and the rear car are not pulled off. At the same time, the reason why the first connecting member 202a is set to a rigid material in this embodiment is that in some working scenes of the bucket wheel machine, the front car 101 and the rear car 102 are on a straight track at the same time, and will not face turning or turning. Therefore, the first connecting member 202a is set to a rigid material. The first connecting member 202a can be specifically as follows Figure 1 The shapes shown are not limited to Figure 1 The shape shown will do as long as it can achieve the technical effect in this embodiment.

[0050] Example 3

[0051] Reference Figure 2 and Figure 4 This embodiment is different from the above embodiments in that: the first positioning member 203 includes a fixed shaft, the fixed shaft is arranged on the front car 101, and an electric reel 203b is arranged on the fixed shaft. It should be noted that the electric reel 203b can be controlled by a switch such as a frequency converter to ensure that the retraction and release speed matches the speed of the front car, and can avoid the wire rope from falling to the ground due to excessive curvature.

[0052] Specifically, the second positioning member 204 is disposed in the rear compartment 102. It is worth noting that the second positioning member 204 may also be disposed in the front compartment 101, as long as the same technical effect as that of the present embodiment can be achieved. The second positioning member 204 includes a second fixing block 204b.

[0053] Furthermore, the second connecting member 202b is made of flexible material, one end of the second connecting member 202b is wound around the surface of the electric reel 203b, and the other end of the second connecting member 202b is connected to the second fixed block 204b. The maximum length between the fixed axis of the second connecting member 202b and the second fixed block 204b is the maximum distance between the front carriage 101 and the rear carriage 102, wherein the second connecting member 202b can be a wire rope or a chain, etc.

[0054] The rest of the structure is the same as that of Example 2.

[0055] Operation process: In this embodiment, a flexible connection method is adopted for the front and rear vehicles of the bucket wheel machine. According to the limit distance of the front and rear vehicles being separated during the bucket wheel machine changing process, the installation position of the first positioning member 203 and the second positioning member 204 and the length of the second connecting member 202b are determined. Figure 4 The fixed shaft in the present invention is installed on the front carriage 101, the electric reel 203b is installed on the fixed shaft, and one end of the second connecting member 202b is fixedly connected to the electric reel 203b.

[0056] Then, a second fixing block 204b is installed on the rear compartment 102, and the other end of the second connecting member 202b is fixed on the second fixing block 204b. By connecting the electric drum 203b to one end of the second connecting member 202b, when the front compartment 101 and the rear compartment 102 are separated during the bucket wheel excavator changing process, the electric drum 203b is synchronously driven to rotate and release the second connecting member 202b, and the rotation speed is synchronized with the movement of the front vehicle. When separated to the electrical limit position, the front vehicle stops running. At this time, the unreleased length of the second connecting member 202b should be 0.2 meters; when the electrical limit fails, the second connecting member 202b is in a tensioned state after releasing the remaining 0.2 meters. At this time, the rear vehicle and the front vehicle will not exceed the limit distance, thereby protecting the telescopic chain link and the cable from being pulled and broken by external force. Figure 4 shown.

[0057] During the bucket wheel excavator vehicle change process, when the front vehicle is connected to the rear vehicle, the electric drum 203b is synchronously driven to rotate in the opposite direction to collect the second connecting member 202b, and the collecting speed is synchronized with the backward speed of the front vehicle. After the front vehicle moves backward and connects with the rear vehicle, the electric drum 203b stops collecting the rope.

[0058] It should be noted that during the vehicle changing process of the bucket wheel excavator, an electrical limit is used to control the distance between the front vehicle and the rear vehicle. When the front vehicle and the rear vehicle are separated to the electrical limit position, the front vehicle stops running; when the electrical limit fails, the rear vehicle slips. During the slipping of the rear vehicle, the second connecting piece 202b is in a tensioned state after releasing the remaining 0.2 meters in length. At this time, the rear vehicle and the front vehicle will not exceed the limit distance, thereby protecting the telescopic chain links and cables from being broken by external forces.

[0059] In this embodiment, the limiting component 200 is arranged on both sides of the bucket wheel machine to ensure that the front car and the rear car are not pulled off. At the same time, the reason why the second connecting member 202b is set to a flexible material in this embodiment is that in some working scenes of the bucket wheel machine, the front car 101 and the rear car 102 are not on a straight track at the same time, and they will face turning or turning. Therefore, the second connecting member 202b is set to a rigid material. The second connecting member 202b can be specifically as follows Figure 4 The shapes shown are not limited to Figure 4The shape shown will do as long as it can achieve the technical effect in this embodiment.

[0060] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0061] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0062] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A limit device, characterized in that: include, A carriage (100), comprising a front carriage (101) and a rear carriage (102); The limiting component (200) comprises a positioning component (201) and a connecting component (202), wherein the positioning component (201) is arranged 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).

2. The limiting device according to claim 1, characterized in that: The positioning assembly (201) comprises a first positioning member (203) and a second positioning member (204), wherein the first positioning member (203) and the second positioning member (204) are respectively arranged on the front compartment (101) and the rear compartment (102).

3. The limiting device according to claim 2, characterized in that: The connection assembly (202) comprises a first connection member (202a) and a second connection member (202b), wherein the first connection member (202a) and the second connection member (202b) are both used to connect the first positioning member (203) and the second positioning member (204).

4. The limiting device according to claim 3, characterized in that: The first positioning member (203) comprises a first positioning block (203a), the number of the first positioning block (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).

5. The limiting device according to claim 4, characterized in that: The second positioning member (204) is arranged on the rear compartment (102). The second positioning member (204) comprises a first fixing block (204a). A groove is arranged on a side of the first fixing block (204a) in contact with the first connecting member (202a). The first connecting member (202a) can move along the groove on the first fixing block (204a).

6. The limiting device according to claim 5, characterized in that: The first connecting member (202a) is made of a rigid material, one end of the first connecting member (202a) is fixed to the front compartment (101) via the first positioning member (203), and the other end of the first connecting member (202a) is adapted to a groove of the second positioning member (204).

7. The limiting device according to claim 3, characterized in that: The first positioning member (203) comprises a fixed shaft, the fixed shaft is arranged on the front carriage (101), and an electric reel (203b) is arranged on the fixed shaft.

8. The limiting device according to claim 7, characterized in that: The second positioning member (204) is arranged on the rear compartment (102), and the second positioning member (204) comprises a second fixing block (204b).

9. The limiting device according to claim 8, characterized in that: The second connecting member (202b) is made of a flexible material, one end of the second connecting member (202b) is wound around the surface of the electric reel (203b), and the other end of the second connecting member (202b) is connected to the second fixed block (204b), and the maximum length between the second connecting member (202b) connecting the fixed shaft and the second fixed block (204b) is the maximum distance between the front carriage (101) and the rear carriage (102).

10. A limiting method, characterized in that: The device comprises the limiting device as claimed in any one of claims 3 to 6, and further comprises: By arranging a first positioning member (203) on the front carriage (101), the first positioning member (203) comprising at least one first positioning block (203a); Then, a first fixing block (204a) is arranged on the rear compartment (102), and a groove is arranged on a surface of the first fixing block (204a) that contacts the first connecting member (202a); The first connecting member (202a) is made of a rigid material, one end of which is fixed to the front compartment (101) via the first positioning block (203a), and the other end of which is adapted to a groove on the first fixing block (204a); During the bucket wheel excavator vehicle change process, when the electrical limit fails or the tail vehicle is displaced due to external force, the first connecting member (202a) is used to move along the groove on the first fixing block (204a) to maintain the limit distance between the front vehicle compartment (101) and the rear vehicle compartment (102), thereby preventing the telescopic chain links and cables from being damaged due to excessive stretching.

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