Locomotive coupler disassembling and assembling device and method

Abstract

The invention provides a locomotive coupler disassembling and assembling device and method. The locomotive coupler disassembling and assembling device is used for detachably installing a coupler on a coupler installing base of a locomotive body through bolts. The dismounting and mounting device comprises an upper supporting plate, a lengthening rod and a lower supporting plate. The upper supporting plate is provided with a groove I used for containing the upper portion of the car coupler, and the outline shape of the groove I is matched with the appearance of the upper portion of the car coupler. The lower supporting plate is provided with a groove II used for containing the lower portion of the car coupler, and the outline shape of the groove II is matched with the appearance of the lower portion of the car coupler. The upper supporting plate and the lower supporting plate are each provided with a through hole, and the lengthening rod can penetrate through the through holes. Two ends of the extension rod are thick rods, and the middle is a thin rod; the lengthening rod is used for being matched with a torque wrench to disassemble and assemble the bolt, and the upper supporting plate and the lower supporting plate are used for supporting the lengthening rod through the through holes. The requirement for a tool site is omitted, a trench crane is not needed, and the disassembly and assembly time can be saved.

Description

Technical Field

[0001] The present invention relates to the technical field of locomotive coupler disassembly and assembly, and in particular to a locomotive coupler disassembly and assembly device and method. Background Art

[0002] The EMU consists of a control car, a passenger car, and a power car. The power car and the control car are located at both ends of the EMU, with a certain number of passenger cars connected in the middle. Front-end couplers are installed at both ends of the power car and the control car, and close-fit couplers are used between the power car, the control car and the passenger car, as well as between each passenger car. However, for some EMUs, such as the FXD3 EMU, the 25T close-fit coupler used in the power car cannot be connected with the coupler of the load test locomotive. In order to ensure the smooth trial and shipment of the locomotive, a 15x beam-type coupler is installed at the rear end of the locomotive as a substitute. After the trial and shipment, it is replaced with a 25T close-fit coupler. However, for this type of locomotive, the gap between the bogie and the coupler mounting seat is extremely small, and people cannot enter to work. Work can only be carried out after the bogie and the car body are separated.

[0003] The coupler is replaced when the car body and bogie are connected. Due to limited operating space, the bogie needs to be separated from the car body before replacement. This method requires the cooperation of multiple trades (electricians, fitters, plumbers, cranes, etc.), and the site requirements are also high (cranes or car cranes are required), which is time-consuming and labor-intensive. For example, the method of using a hydraulic torque wrench to disassemble and assemble the coupler is to operate between the car body and the bogie, but the operating space is small. It is necessary to separate the bogie from the car body to have sufficient operating space before it can be performed. The gap between the bogie and the coupler mounting seat is extremely small, and people cannot enter to operate. The bogie can only be operated after it is separated from the car body. The problems with this method include: (1) The operating space when using a hydraulic torque wrench is limited to the space between the bogie and the car body, and the operating space is small and the operation is difficult; (2) It is impossible to observe the movement of the torque wrench reaction arm. (3) There is a risk of personal injury when the bogie is not properly tooled and the tools cannot be removed after the work is completed; (4) The bogie needs to be separated from the car body, which requires the cooperation of multiple trades (electricians, fitters, pipefitters, cranes, etc.). There are also requirements for the site, which requires a crane or a car crane, and the workload is very large; there is also a disassembly and assembly method that operates from the front end of the coupler, but the front end space is also small, and there are many protruding positions on the coupler structure, which further reduces the operating space. There is no suitable tool to enter, and an extension rod needs to be used to lead it out. The torque wrench is operated externally and is not restricted by space. The existing problems include: (1) The coupler requires a large torque to tighten, and the extension rod will deform or even break during use, making it impossible to continue the operation to complete the tightening; (2) When the extension rod is used at the bottom of the coupler, it will interfere with the coupler and the torque cannot be tightened. Summary of the invention

[0004] In view of the technical problems mentioned above, such as the limited space and inability to operate in the existing EMU coupler disassembly and assembly method, the extension rod is easily deformed, and the bogie needs to be replaced when the coupler is replaced, a locomotive coupler disassembly and assembly device and method are provided. The present invention designs a set of combined tooling according to the shape of the coupler and the installation space, and realizes the disassembly and assembly of the coupler by using the combined tooling in conjunction with a torque wrench.

[0005] The technical means adopted by the present invention are as follows:

[0006] A locomotive coupler disassembly and assembly device, used to detachably mount the coupler on a coupler mounting seat of a vehicle body through bolts;

[0007] The disassembly and assembly device comprises an upper support plate, an extension rod and a lower support plate;

[0008] The upper support plate is provided with a groove I for accommodating the upper part of the coupler, and the contour shape of the groove I matches the outer shape of the upper part of the coupler;

[0009] The lower support plate is provided with a groove II for accommodating the lower part of the coupler, and the contour shape of the groove II matches the outer shape of the lower part of the coupler;

[0010] The upper support plate and the lower support plate are both provided with through holes through which the extension rod can pass;

[0011] The extension rod is a solid rod structure with thick rods at both ends and a thin rod in the middle. The thick rod at one end is used to be connected to the bolt through a sleeve, and the thick rod at the other end is used to be connected to a torque wrench for disassembling and assembling the bolt through a sleeve; the extension rod is used to cooperate with the torque wrench to disassemble and assemble the bolt for connecting the coupler and the coupler mounting seat, and the upper support plate and the lower support plate are used to support the extension rod through the through hole.

[0012] Further, the gap between the coupler and the coupler mounting seat is an installation space;

[0013] The upper support plate is used to be installed in the installation space and clamped to the upper part of the coupler through the groove I, supporting the extension rod passing through the through hole on the upper support plate, and disassembling the bolt used to connect the coupler and the upper end of the coupler mounting seat;

[0014] The lower support plate is used to be installed in the installation space and clamped to the lower part of the coupler through the groove II, supporting the extension rod passing through the through hole on the lower support plate, and disassembling and assembling the bolts for connecting the coupler and the lower end of the coupler mounting seat.

[0015] Furthermore, when the extension rod is used to disassemble and assemble the bolt, the thick rod at one end is connected to the bolt through a sleeve, and the thick rod at the other end is connected to the torque wrench through a sleeve, and the thin rod in the middle is located in the through hole.

[0016] Furthermore, the top corners on both sides of the top of the upper support plate are processed into chamfers.

[0017] Furthermore, the diameter of the through hole is greater than or equal to the diameter of the thick rod.

[0018] Furthermore, the width of the portion of the upper support plate located on both sides and the top of the groove I is equal to the width of the gap between the two sides and the top of the coupler and the coupler mounting seat, so that the upper support plate can be stuck in the mounting space;

[0019] The width of the portion of the lower support plate located on both sides and below the groove II is equal to the width of the gap between the two sides and the lower part of the coupler and the coupler mounting seat, so that the lower support plate can be stuck in the installation space.

[0020] The present invention also provides a locomotive coupler disassembly and assembly method using the locomotive coupler disassembly and assembly device, which specifically comprises the following steps:

[0021] S1, disassembling and assembling the bolt used to connect the coupler and the upper end of the coupler mounting seat;

[0022] S1-1, installing the upper support plate in the gap between the upper part of the hook and the hook mounting seat, so that the groove I is engaged with the upper part of the hook;

[0023] S1-2, installing the extension rod for disassembling and assembling the bolt in the through hole on the upper support plate, so that the thin rod in the middle of the extension rod is located in the through hole;

[0024] One end of the extension rod located on the inner side of the upper support plate is connected to the bolt that needs to be tightened or removed through a sleeve;

[0025] S1-3, one end of the extension rod located outside the upper support plate is connected to the torque wrench through a sleeve, and the torque wrench is operated to complete the tightening or removal of the bolt. When tightening or removing the bolt, the upper support plate plays a role of supporting the extension rod;

[0026] S1-4, after the bolt operation for connecting the coupler and the upper end of the coupler mounting seat is completed, the upper support plate is withdrawn;

[0027] S2, disassembling and assembling the bolt used to connect the coupler and the lower end of the coupler mounting seat;

[0028] S2-1, installing the lower support plate in the gap between the lower part of the coupler and the coupler mounting seat, so that the groove II is engaged with the lower part of the coupler;

[0029] S2-2, installing the extension rod for disassembling and assembling the bolt in the through hole on the lower support plate, so that the thin rod in the middle of the extension rod is located in the through hole;

[0030] One end of the extension rod located on the inner side of the lower support plate is connected to the bolt that needs to be tightened or removed through a sleeve;

[0031] S2-3, one end of the extension rod located outside the lower support plate is connected to the torque wrench through a sleeve, and the torque wrench is operated to complete the tightening or removal of the bolt. When tightening or removing the bolt, the lower support plate plays a role of supporting the extension rod;

[0032] S2-4. After the bolt operation for connecting the coupler and the lower end of the coupler mounting seat is completed, the lower support plate is withdrawn, thereby completing the disassembly and assembly operation of the coupler.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] Adopting the locomotive coupler disassembly and assembly device and method provided by the present invention to disassemble and assemble the coupler can avoid disassembling the bogie (disassembling the pipeline connection, cable connection, drawbar, etc.), and at the same time eliminates the requirements for the work site, does not require a trench crane, and saves disassembly and assembly time.

[0035] Based on the above reasons, the present invention can be widely promoted in the field of motor vehicle coupler disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0037] Figure 1 This is a schematic structural diagram of the locomotive coupler disassembly and assembly device of the present invention.

[0038] Figure 2 This is a schematic diagram of the operating status of the locomotive coupler disassembly and assembly device of the present invention.

[0039] Figure 3 This is a schematic diagram of the working state of the upper support plate of the present invention.

[0040] Figure 4It is a schematic diagram of the working state of the lower support plate described in the present invention.

[0041] In the figure: 1. Hook; 2. Upper support plate; 3. Extension rod; 4. Lower support plate; 5. Installation space. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0046] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0049] Example 1

[0050] like Figure 1-4 As shown, the present invention provides a locomotive coupler disassembly and assembly device, which is used to detachably mount a coupler 1 on a coupler mounting seat of a vehicle body by means of bolts;

[0051] The disassembly and assembly device comprises an upper support plate 2, an extension rod 3 and a lower support plate 4;

[0052] The upper support plate 2 is provided with a groove I for accommodating the upper part of the coupler 1, and the contour shape of the groove I matches the shape of the upper part of the coupler 1;

[0053] The lower support plate 4 is provided with a groove II for accommodating the lower part of the coupler 1, and the contour shape of the groove II matches the outer shape of the lower part of the coupler 1;

[0054] The upper support plate 2 and the lower support plate 4 are both provided with through holes through which the extension rod 3 can pass;

[0055] The extension rod 3 is a solid rod structure with thick rods at both ends and a thin rod in the middle. The thick rod at one end is used to be connected to the bolt through a sleeve, and the thick rod at the other end is used to be connected to a torque wrench for disassembling and assembling the bolt through a sleeve; the extension rod 3 is used to cooperate with the torque wrench to disassemble and assemble the bolt for connecting the coupler and the coupler mounting seat, and the upper support plate 2 and the lower support plate 4 are used to support the extension rod 3 through the through hole.

[0056] Furthermore, the gap between the coupler 1 and the coupler mounting seat is the mounting space 5;

[0057] The upper support plate 2 is used to be installed in the installation space 5 and is clamped to the upper part of the coupler 1 through the groove I, supports the extension rod 3 passing through the through hole on the upper support plate 2, and disassembles the bolts used to connect the coupler and the upper end of the coupler mounting seat;

[0058] The lower support plate 4 is used to be installed in the installation space 5 and is clamped to the lower part of the coupler 1 through the groove II, supporting the extension rod 3 passing through the through hole on the lower support plate 4, and disassembling and assembling the bolts for connecting the coupler and the lower end of the coupler mounting seat.

[0059] Furthermore, when the extension rod 3 is disassembling and assembling the bolt, the thick rod at one end is connected to the bolt through a sleeve, and the thick rod at the other end is connected to the torque wrench through a sleeve, and the thin rod in the middle is located in the through hole; when the torque wrench is rotated to disassemble and assemble the bolt, the upper support plate 2 and the lower support plate 4 can play a certain supporting and limiting role for the extension rod 3. Since the thin rod is located in the through hole, the extension rod 3 can be prevented from interfering with the coupler 1 during operation.

[0060] Furthermore, the top corners on both sides of the top of the upper support plate 2 are processed into chamfers to avoid interference with the coupler mounting seat during operation.

[0061] Furthermore, the bolt is a hexagonal bolt, the thick rods at both ends of the extension rod 3 are hexagonal prism structures, and the sleeve used to connect the bolt and the torque wrench matches the model of the thick rod.

[0062] Furthermore, the diameter of the through hole is greater than or equal to the diameter of the thick rod.

[0063] Furthermore, the width of the portion of the upper support plate 2 located on both sides and the top of the groove I is equal to the width of the gap between the two sides and the top of the coupler and the coupler mounting seat, so that the upper support plate 2 can be stuck in the mounting space 5;

[0064] The width of the portion of the lower support plate 4 located on both sides and below the groove II is equal to the width of the gap between the two sides and the lower part of the coupler and the coupler mounting seat, so that the lower support plate 4 can be stuck in the mounting space 5;

[0065] The dimensions of the grooves I and II on the upper support plate 2 and the lower support plate 4 are determined based on the gap between the installation space 5 of the coupler 1, that is, the size of the installation space 5. Such a setting enables the upper support plate 2 and the lower support plate 4 to be stuck in the installation space 5, and no shaking will occur when the extension rod 3 is rotated to disassemble and assemble the bolt.

[0066] The present invention also provides a locomotive coupler disassembly and assembly method using the locomotive coupler disassembly and assembly device, which specifically comprises the following steps:

[0067] S1, disassembling and assembling the bolt used to connect the coupler 1 and the upper end of the coupler mounting seat;

[0068] S1-1, install the upper support plate 2 in the gap between the upper part of the coupler 1 and the coupler mounting seat, so that the upper support plate 2 is clamped in the mounting space 5 and the groove I is clamped on the upper part of the coupler 1;

[0069] S1-2, installing the extension rod 3 for disassembling and assembling the bolt in the through hole on the upper support plate 2, so that the thin rod in the middle of the extension rod 3 is located in the through hole;

[0070] One end of the extension rod 3 located on the inner side of the upper support plate 2 is connected to the bolt that needs to be tightened or removed through a sleeve;

[0071] S1-3, one end of the extension rod 3 located outside the upper support plate 2 is connected to the torque wrench through a sleeve, and the torque wrench is operated to complete the tightening or removal of the bolt. When tightening or removing the bolt, the upper support plate 2 plays a role of supporting the extension rod 3;

[0072] S1-4, after the bolt operation for connecting the coupler 1 and the upper end of the coupler mounting seat is completed, the upper support plate 2 is withdrawn;

[0073] S2, disassembling and assembling the bolt used to connect the coupler 1 and the lower end of the coupler mounting seat;

[0074] S2-1, install the lower support plate 4 in the gap between the lower part of the coupler 1 and the coupler mounting seat, so that the lower support plate 4 is clamped in the mounting space 5 and the groove II is clamped in the lower part of the coupler 1;

[0075] S2-2, installing the extension rod 3 for disassembling the bolt in the through hole on the lower support plate 4, so that the thin rod in the middle of the extension rod 3 is located in the through hole;

[0076] One end of the extension rod 3 located on the inner side of the lower support plate 4 is connected to the bolt that needs to be tightened or removed through a sleeve;

[0077] S2-3, one end of the extension rod 3 located outside the lower support plate 4 is connected to the torque wrench through a sleeve, and the torque wrench is operated to complete the tightening or removal of the bolt. When tightening or removing the bolt, the lower support plate 4 plays a role of supporting the extension rod 3;

[0078] S2-4. After the bolt operation for connecting the coupler 1 and the lower end of the coupler mounting seat is completed, the lower support plate 4 is withdrawn, and the disassembly and assembly operation of the coupler 1 is completed.

[0079] Adopting the locomotive coupler disassembly and assembly device and method provided by the present invention to disassemble and assemble the coupler can avoid disassembling the bogie (disassembling the pipeline connection, cable connection, drawbar, etc.), and at the same time eliminates the requirements for the work site, does not require a trench crane, and saves disassembly and assembly time.

[0080] Finally, 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A locomotive coupler disassembly and assembly device, characterized in that: Used to detachably mount the coupler on the coupler mounting seat of the vehicle body by bolts; the disassembly and assembly device comprises an upper support plate, an extension rod and a lower support plate; The upper support plate is provided with a groove I for accommodating the upper part of the coupler, and the contour shape of the groove I matches the outer shape of the upper part of the coupler; The lower support plate is provided with a groove II for accommodating the lower part of the coupler, and the contour shape of the groove II matches the outer shape of the lower part of the coupler; The upper support plate and the lower support plate are both provided with through holes through which the extension rod can pass; The extension rod is a solid rod structure with thick rods at both ends and a thin rod in the middle. The thick rod at one end is used to be connected to the bolt through a sleeve, and the thick rod at the other end is used to be connected to a torque wrench for disassembling and assembling the bolt through a sleeve; the extension rod is used to cooperate with the torque wrench to disassemble and assemble the bolt for connecting the coupler and the coupler mounting seat, and the upper support plate and the lower support plate are used to support the extension rod through the through hole.

2. The locomotive coupler disassembly and assembly device according to claim 1, characterized in that: The gap between the coupler and the coupler mounting seat is the mounting space; The upper support plate is used to be installed in the installation space and clamped to the upper part of the coupler through the groove I, supporting the extension rod passing through the through hole on the upper support plate, and disassembling the bolt used to connect the coupler and the upper end of the coupler mounting seat; The lower support plate is used to be installed in the installation space and clamped to the lower part of the coupler through the groove II, supporting the extension rod passing through the through hole on the lower support plate, and disassembling and assembling the bolts for connecting the coupler and the lower end of the coupler mounting seat.

3. The locomotive coupler disassembly and assembly device according to claim 1, characterized in that: When the extension rod is used to disassemble and assemble the bolt, the thick rod at one end is connected to the bolt through a sleeve, and the thick rod at the other end is connected to the torque wrench through a sleeve, and the thin rod in the middle is located in the through hole.

4. The locomotive coupler disassembly and assembly device according to claim 1, characterized in that: The top corners on both sides of the top of the upper support plate are processed into chamfers.

5. The locomotive coupler disassembly and assembly device according to claim 1, characterized in that: The diameter of the through hole is greater than or equal to the diameter of the thick rod.

6. The locomotive coupler disassembly and assembly device according to claim 1, characterized in that: The width of the portion of the upper support plate located on both sides and the top of the groove I is equal to the width of the gap between the two sides and the top of the coupler and the coupler mounting seat, so that the upper support plate can be stuck in the mounting space; The width of the portion of the lower support plate located on both sides and below the groove II is equal to the width of the gap between the two sides and the lower part of the coupler and the coupler mounting seat, so that the lower support plate can be stuck in the installation space.

7. A locomotive coupler disassembly and assembly method using the locomotive coupler disassembly and assembly device, specifically comprising the following steps: S1, disassembling and assembling the bolt used to connect the coupler and the upper end of the coupler mounting seat; S1-1, installing the upper support plate in the gap between the upper part of the hook and the hook mounting seat, so that the groove I is engaged with the upper part of the hook; S1-2, installing the extension rod for disassembling and assembling the bolt in the through hole on the upper support plate, so that the thin rod in the middle of the extension rod is located in the through hole; One end of the extension rod located on the inner side of the upper support plate is connected to the bolt that needs to be tightened or removed through a sleeve; S1-3, one end of the extension rod located outside the upper support plate is connected to the torque wrench through a sleeve, and the torque wrench is operated to complete the tightening or removal of the bolt. When tightening or removing the bolt, the upper support plate plays a role of supporting the extension rod; S1-4, after the bolt operation for connecting the coupler and the upper end of the coupler mounting seat is completed, the upper support plate is withdrawn; S2, disassembling and assembling the bolt used to connect the coupler and the lower end of the coupler mounting seat; S2-1, installing the lower support plate in the gap between the lower part of the coupler and the coupler mounting seat, so that the groove II is engaged with the lower part of the coupler; S2-2, installing the extension rod for disassembling and assembling the bolt in the through hole on the lower support plate, so that the thin rod in the middle of the extension rod is located in the through hole; One end of the extension rod located on the inner side of the lower support plate is connected to the bolt that needs to be tightened or removed through a sleeve; S2-3, one end of the extension rod located outside the lower support plate is connected to the torque wrench through a sleeve, and the torque wrench is operated to complete the tightening or removal of the bolt. When tightening or removing the bolt, the lower support plate plays a role of supporting the extension rod; S2-4. After the bolt operation for connecting the coupler and the lower end of the coupler mounting seat is completed, the lower support plate is withdrawn, thereby completing the disassembly and assembly operation of the coupler.

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