Flexible blanking device for PCBs (Printed Circuit Boards) in vertical state

Abstract

The utility model discloses a flexible blanking device for a vertical PCB (Printed Circuit Board). The flexible blanking device comprises a mounting plate, a vertical cylinder, a rotation controller and a telescopic clamping jaw part, the mounting plate is horizontally arranged, the vertical air cylinder is vertically mounted on one side of the mounting plate, and the telescopic end of the vertical air cylinder is vertically arranged downwards; the rotary controller is mounted on the mounting plate and close to the vertical cylinder, one end of the rotary controller is in transmission connection with the telescopic end of the vertical cylinder, and the telescopic clamping jaw part is horizontally mounted at the other end of the rotary controller; by integrating the 90-degree rotating and swinging function, the PCB can be flexibly switched between the vertical state and the horizontal state, and the surface of the board can be finely processed more easily, so that the processing quality and consistency of the board are remarkably improved, high-precision automatic blanking of the PCB is further realized, the production efficiency is improved, and the production cost is reduced. And the stability and reliability of the production process are ensured, and the method can easily adapt to PCBs of different specifications and types.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial robot field, especially a kind of flexible unloading device of vertical state PCB board. BACKGROUND

[0002] In the production process of electroplating annular steel belt cleaning line, PCB board (printed circuit board) needs to be taken out from the unloading position after completing electroplating and cleaning process;At present, this key step mainly relies on manual operation, i.e. the operator needs to manually unload the PCB board in vertical state at the unloading position of electroplating annular steel belt cleaning line;However, this traditional manual unloading method has many disadvantages:

[0003] On the one hand, manual operation is intensive, and long-time repetitive work can easily lead to operator fatigue, thereby affecting work efficiency and operation accuracy.

[0004] On the other hand, manual control often cannot achieve high accuracy, which may cause PCB board damage or inaccurate positioning during handling, affecting subsequent processing flow.

[0005] In addition, although industrial robots have become increasingly popular in automated manufacturing, existing industrial robots do not have a dedicated handling mechanism for vertical state PCB board.

[0006] In summary, the existing manual unloading method not only has high labor intensity, inaccurate control and low work efficiency, but also lacks an industrial robot handling mechanism compatible with it, limiting the application and development of automation technology in electroplating annular steel belt cleaning line. INVENTION CONTENTS

[0007] The main purpose of the utility model is to provide a flexible unloading device for vertical state PCB board to solve the above-mentioned problems in the prior art.

[0008] To solve the above technical problems, the utility model adopts one technical scheme: providing a flexible unloading device for vertical state PCB board, comprising:

[0009] mounting plate, vertical cylinder, rotary controller and telescopic clamping jaw part.

[0010] The mounting plate is horizontally arranged, the vertical cylinder is vertically mounted on one side of the mounting plate, and the telescopic end of the vertical cylinder is vertically arranged downward;

[0011] The rotating controller is mounted on the mounting plate and close to the vertical cylinder, one end of the rotating controller is in transmission connection with the telescopic end of the vertical cylinder, and the telescopic jaw part is horizontally mounted on the other end of the rotating controller;

[0012] The vertical cylinder is used for controlling the telescopic end to displace in the vertical direction;

[0013] The telescopic end is used for driving the rotating controller to rotate when the telescopic end displaces in the vertical direction;

[0014] The rotating controller is used for driving the telescopic jaw part to rotate around the center axis at the center of the rotating controller when the rotating controller rotates;

[0015] The telescopic jaw part is used for clamping the PCB.

[0016] As an improved scheme, the rotating controller comprises a rotating shaft connecting plate, a rotating shaft, a cylinder supporting block and a rotating connecting rod;

[0017] The rotating shaft connecting plate is vertically mounted on the lower surface of the mounting plate and close to the vertical cylinder, and a horizontal through hole is formed on the rotating shaft connecting plate close to the bottom;

[0018] The rotating shaft is horizontally and rotatably embedded in the through hole;

[0019] The cylinder supporting block is arranged in parallel to the rotating shaft connecting plate and is mounted on one side of the rotating shaft, and the cylinder supporting block is coaxially arranged with the rotating shaft;

[0020] The rotating connecting rod is mounted on one side of the cylinder supporting block and close to the vertical cylinder, and the lower end of the rotating connecting rod corresponds to the telescopic end of the vertical cylinder, and the lower end of the rotating connecting rod is hinged to the telescopic end of the vertical cylinder.

[0021] As an improved scheme, the lower end of the rotating connecting rod is connected to the telescopic end of the vertical cylinder through a U-shaped hinge seat;

[0022] The U-shaped hinge seat is mounted on the telescopic end of the vertical cylinder, the U-shaped groove of the U-shaped hinge seat is vertically arranged downward, the lower end of the rotating connecting rod is located in the U-shaped groove, and the lower end of the rotating connecting rod is hinged to both sides of the U-shaped groove.

[0023] As an improved scheme, the rotating controller further comprises a buffer strip and a buffer;

[0024] The buffer strip is installed on the other side of the rotating shaft relative to the cylinder support block, and the buffer is installed on the rotating shaft connecting plate at a position corresponding to the end of the buffer strip;

[0025] The buffer strip is used for synchronous rotation when the rotating shaft rotates, and the buffer is used for limiting the rotation angle of the buffer strip to ninety degrees.

[0026] As an improved scheme, the buffer comprises an upper angle buffer and a lower angle buffer.

[0027] The upper angle buffer is arranged on the rotating shaft connecting plate corresponding to the buffer strip, and the upper angle buffer is located on one side of the rotating shaft connecting plate and away from the vertical cylinder; the upper angle buffer is arranged higher than the buffer strip; when the upper end of the buffer strip rotates vertically upward, the upper angle buffer is located on one side close to the upper end of the buffer strip.

[0028] The lower angle buffer is installed on the bottom of the rotating shaft connecting plate corresponding to the buffer strip, and the lower angle buffer is arranged lower than the buffer strip; when the upper end of the buffer strip rotates horizontally to one side of the vertical cylinder, the lower angle buffer is located directly below the upper end of the buffer strip.

[0029] As an improved scheme, the telescopic jaw part comprises a telescopic cylinder, a width adjusting plate and a jaw cylinder.

[0030] The telescopic cylinder is horizontally installed on the cylinder support block, and the telescopic cylinder is located on the other side of the cylinder support block relative to the rotating link;

[0031] The width adjusting plate is vertically installed on the telescopic end of the telescopic cylinder, and the width adjusting plate is perpendicular to the telescopic cylinder;

[0032] The jaw cylinder is movably installed on the width adjusting plate; the jaw cylinder is provided with two jaw ends arranged side by side on the upper end of the jaw cylinder, and the clamping directions of the two jaw ends are vertically upward; the jaw cylinder is used for controlling the clamping action of the two jaw ends.

[0033] The telescopic cylinder is used for controlling the displacement of the width adjusting plate in the horizontal direction.

[0034] As an improved scheme, a strip-shaped hole is formed on the width adjusting plate along the width direction of the width adjusting plate, the strip-shaped hole horizontally penetrates the width adjusting plate, and one side of the jaw cylinder is detachably connected to the strip-shaped hole.

[0035] As an improved scheme, the rotating link is J-shaped.

[0036] As an improved scheme, the concave surface of the rotating connecting rod is arranged towards the vertical air cylinder, and the convex surface of the rotating connecting rod is arranged towards the telescopic air cylinder.

[0037] As an improved scheme, the upper angle buffer and the lower angle buffer are connected with the rotating shaft connecting plate through buffer connecting plates respectively.

[0038] The utility model discloses a beneficial effect is:

[0039] The utility model discloses a flexible unloading device of vertical state PCB board passes through the integration 90 degree rotation swing function, makes the PCB board can be flexible conversion between vertical and horizontal state, this characteristic not only facilitates the seamless link of PCB board between different processes, and when conveying under the vertical state, fine treatment is more easily carried out to the board surface, thereby the processing quality and consistency of board are improved significantly, and then realize the high accuracy automatic unloading of PCB board, improve production efficiency, also ensure the stability and reliability of production process, can easily adapt to different specifications and types of PCB board, provide strong technical support for the automation upgrading of electroplating annular steel belt cleaning line. BRIEF DESCRIPTION OF DRAWINGS

[0040] Fig. 1 It is the three -dimensional structure schematic diagram of another visual angle under the material taking state of the flexible unloading device of vertical state PCB board in the utility model embodiment;

[0041] Fig. 2 It is the three -dimensional structure schematic diagram of another visual angle under the material taking state of the flexible unloading device of vertical state PCB board in the utility model embodiment;

[0042] Fig. 3 It is the side view structure schematic diagram under the material taking state of the flexible unloading device of vertical state PCB board in the utility model embodiment;

[0043] Fig. 4 It is the three -dimensional structure schematic diagram under the material placing state of the flexible unloading device of vertical state PCB board in the utility model embodiment;

[0044] The marks of each component in the drawing are as follows:

[0045] 1, mounting plate, 2, vertical air cylinder, 3, rotating shaft connecting plate, 4, rotating shaft, 5, air cylinder support block, 6, rotating connecting rod, 7, U-shaped hinged seat, 8, buffer strip, 9, upper angle buffer, 10, lower angle buffer, 11, buffer connecting plate, 12, telescopic air cylinder, 13, width adjusting plate, 14, strip hole, 15, clamping jaw air cylinder, 16, clamping jaw end, 17, PCB board. DETAILED DESCRIPTION

[0046] The advantages and features of the present application can be more easily understood by persons skilled in the art with the preferred embodiments of the present application described in detail below with reference to the drawings, so that the scope of protection of the present application can be more clearly defined.

[0047] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0049] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0051] It is to be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar terms as used herein are for the purpose of description only and are not intended to be limiting.

[0052] Referring to Figs. 1-4 The utility model embodiment includes:

[0053] A flexible unloading device for vertical state PCB boards, comprising:

[0054] (1) mounting plate 1, horizontally arranged, providing support for the device, the right end of the mounting plate 1 is supported and installed at various production line required positions.

[0055] (2) vertical cylinder 2, vertically installed on the left end of the mounting plate 1 by using a cylinder mounting seat, the telescopic end of the vertical cylinder 2 is vertically arranged downward, the telescopic end of the vertical cylinder 2 is connected with a rotary controller, the vertical cylinder 2 converts the vertical telescopic action into rotary control through the rotary controller, thereby realizing high-precision rotary control of the telescopic jaw part without a rotary table or a motor; wherein the specific structure of the rotary controller is as follows:

[0056] (2.1) shaft connecting plate 3, vertically installed on the lower surface of the mounting plate 1 and close to the vertical cylinder 2, capable of supporting the installation of other matching components; a horizontal through hole is formed in the bottom of the shaft connecting plate 3;

[0057] (2.2) rotary shaft 4, horizontally and rotatably embedded in the above-mentioned through hole;

[0058] (2.3) cylinder support block 5, arranged parallel to the shaft connecting plate 3 and installed on one side of the rotary shaft 4, coaxially arranged with the rotary shaft 4, capable of rotating around the rotary shaft 4 as the center axis with the rotation of the rotary shaft 4;

[0059] (2.4) rotary connecting rod 6, installed on one side of the cylinder support block 5 and close to the vertical cylinder 2, the concave surface of the rotary connecting rod 6 is arranged towards the vertical cylinder 2, and the lower end of the rotary connecting rod 6 corresponds to the telescopic end of the vertical cylinder 2, the rotary connecting rod 6 is mainly used for connecting with the vertical cylinder 2; in a preferred embodiment, the rotary connecting rod 6 is in the shape of "J";

[0060] (2.5) A U-shaped hinge seat 7 is installed at the telescopic end of the vertical cylinder 2, the U-shaped groove of the U-shaped hinge seat 7 is vertically downward, and the lower end of the rotating connecting rod 6 is located in the U-shaped groove, and the two sides of the U-shaped groove are hinged with the two sides of the lower end of the rotating connecting rod 6; based on this design, when the telescopic end of the vertical cylinder 2 is telescoped downward, the rotating shaft 4 can be driven to rotate through the linkage action of the rotating connecting rod 6 and the cylinder support block 5;

[0061] (2.6) A buffer strip 8 is installed on the other side of the rotating shaft 4 relative to the cylinder support block 5, which is used for synchronous rotation when the rotating shaft 4 rotates, and cooperates with the buffer to limit the rotation angle of the rotating shaft 4;

[0062] (2.7) An upper angle buffer 9 is installed on one side of the rotating shaft connecting plate 3 away from the vertical cylinder 2 through a buffer connecting plate 11, and the upper angle buffer 9 is higher than the buffer strip 8; when the buffer strip 8 rotates to its upper end vertically upward, the upper angle buffer 9 is located on the side close to the upper end of the buffer strip 8, thereby limiting the rotation angle of the buffer strip 8 when it rotates clockwise;

[0063] (2.8) A lower angle buffer 10 is installed at the bottom of the rotating shaft connecting plate 3 through a buffer connecting plate 11, and the lower angle buffer 10 is lower than the buffer strip 8; when the buffer strip 8 rotates to its upper end horizontally to the side of the vertical cylinder 2, the lower angle buffer 10 is located directly below the upper end of the buffer strip 8, thereby limiting the rotation angle of the buffer strip 8 when it rotates counterclockwise; through the upper angle buffer 9 and the lower angle buffer 10, the rotation angle of the rotating shaft 4 can be limited to 90 degrees.

[0064] (3) A telescopic clamping jaw part is installed on the rotating controller and rotates when the rotating controller rotates, and the telescopic clamping jaw part is mainly used to realize the grabbing of the PCB board 17 in the vertical state, and its specific structure is as follows:

[0065] (3.1) A telescopic cylinder 12 is horizontally installed on one side of the cylinder support block 5, and the telescopic end of the telescopic cylinder 12 is horizontally arranged to the right; the convex surface of the rotating connecting rod 6 faces the telescopic cylinder 12;

[0066] (3.2) A width adjusting plate 13 is vertically installed at the telescopic end of the telescopic cylinder 12, and the width adjusting plate 13 is perpendicular to the telescopic cylinder 12, and the width adjusting plate 13 is provided with a strip-shaped hole 14 horizontally penetrating through the width adjusting plate 13, and the strip-shaped hole 14 is arranged along the width direction of the width adjusting plate 13;

[0067] (3.3) the clamping jaw cylinder 15 is detachably mounted on the width adjusting plate 13, and is locked on the strip-shaped hole 14 through detachable connecting members (such as bolts and nuts); the two clamping jaw ends 16 of the clamping jaw cylinder 15 are vertically upwardly arranged, and are located on one side of the width adjusting plate 13; the clamping jaw cylinder 15 is used for controlling the extension and retraction of the clamping jaw ends 16 in the horizontal direction, so as to realize the clamping function; the clamping jaw arranged in this way can clamp the vertically arranged PCB 17 from bottom to top, and complete the clamping action; when the size of the PCB 17 changes (such as widening), the nuts and bolts connected between the clamping jaw cylinder 15 and the strip-shaped hole 14 can be loosened, the clamping jaw cylinder 15 can be moved along the strip-shaped hole 14 (such as downwardly), and then the clamping space of the clamping jaw cylinder 15 is adapted to different PCB sizes; under the action of the vertical cylinder 2 and the rotary controller, the clamping jaw cylinder 15 can also support the clamping function of the PCB in the horizontal state, and has high flexibility and applicability.

[0068] Based on the above structure, the device can realize the clamping and transportation of different specifications of the PCB 17 in the vertical state, and is also compatible with the PCB in the horizontal state, and has a wide application range; in one embodiment, the working principle is as follows:

[0069] In the material taking state of the device, the extension ends of the vertical cylinder 2 and the telescopic cylinder 12 are in the extended state, at this time, the buffer strip 8 is horizontally oriented to the side of the vertical cylinder 2, the telescopic cylinder 12 is horizontally arranged, the clamping jaw ends 16 of the clamping jaw cylinder 15 are just positioned at the incoming material position of the PCB, and at this time, the vertically (perpendicularly) arranged PCB is waiting for transportation and feeding.

[0070] After the vertically arranged PCB is fed, the clamping jaw cylinder 15 pushes the clamping jaw to clamp the PCB, and whether the clamping is successful is judged through the sensor; after the clamping is successful, the telescopic cylinder 12 is retracted, the vertical cylinder 2 is contracted, the clockwise rotation of the buffer strip 8 by 90 degrees is realized through the rotary controller, at this time, the telescopic cylinder 12 is in the vertical state, and the PCB is in the horizontal state, at this time, the device is in the material discharging state; then the telescopic cylinder 12 is extended downwardly, the clamping jaw cylinder 15 pushes the clamping jaw to release the horizontal PCB 17, and places the horizontal PCB 17 on the horizontal position, and the material discharging action is completed.

[0071] The above only describes the embodiments of the device, and does not limit the patent range of the device, and any equivalent structure obtained by referring to the content of the device specification and the drawings, or directly or indirectly used in other related technical fields, is also included in the patent protection range of the device.

Claims

1. A flexible unloading device for vertically positioned PCB boards, characterized in that, include: Mounting plate (1), vertical cylinder (2), rotation controller and telescopic gripper; The mounting plate (1) is set horizontally, and the vertical cylinder (2) is installed vertically on one side of the mounting plate (1), with the telescopic end of the vertical cylinder (2) set vertically downward; The rotary controller is installed on the mounting plate (1) and close to the vertical cylinder (2). One end of the rotary controller is connected to the telescopic end of the vertical cylinder (2) for transmission, and the telescopic gripper is horizontally installed on the other end of the rotary controller. The vertical cylinder (2) is used to control the displacement of the telescopic end in the vertical direction; The telescopic end is used to drive the rotation controller to rotate when it is displaced in the vertical direction; The rotation controller is used to drive the telescopic gripper to rotate around the center of the rotation controller as the central axis during rotation. The telescopic gripper is used to hold the PCB board (17).

2. The flexible unloading device for a vertical PCB board (17) according to claim 1, characterized in that: The rotation controller includes: a rotating shaft connecting plate (3), a rotating shaft (4), a cylinder support block (5), and a rotating connecting rod (6). The rotating shaft connecting plate (3) is vertically installed on the lower surface of the mounting plate (1) and close to the vertical cylinder (2). A horizontal through hole is provided on the rotating shaft connecting plate (3) near the bottom. The rotating shaft (4) is horizontally and rotatably embedded in the through hole; The cylinder support block (5) is arranged parallel to the rotating shaft connecting plate (3) and installed on one side of the rotating shaft (4). The cylinder support block (5) and the rotating shaft (4) are coaxially arranged. The rotating connecting rod (6) is installed on one side of the cylinder support block (5) and close to the vertical cylinder (2), and the lower end of the rotating connecting rod (6) is set at the telescopic end of the vertical cylinder (2), and the lower end of the rotating connecting rod (6) is hinged to the telescopic end of the vertical cylinder (2).

3. The flexible unloading device for a vertical PCB board (17) according to claim 2, characterized in that: The lower end of the rotating connecting rod (6) is connected to the telescopic end of the vertical cylinder (2) through a U-shaped hinge seat (7); The U-shaped hinge seat (7) is installed on the telescopic end of the vertical cylinder (2). The U-shaped groove of the U-shaped hinge seat (7) is set vertically downward, and the lower end of the rotating connecting rod (6) is located in the U-shaped groove. The lower end of the rotating connecting rod (6) is hinged to both sides of the U-shaped groove.

4. The flexible unloading device for a vertical PCB board (17) according to claim 2, characterized in that: The rotation controller further includes: a buffer bar (8) and a buffer; The buffer bar (8) is installed on the other side of the rotating shaft (4) relative to the cylinder support block (5), and the buffer is installed on the rotating shaft connecting plate (3) at the position corresponding to the end of the buffer bar (8); The buffer bar (8) is used to rotate synchronously when the rotating shaft (4) rotates; the buffer is used to limit the rotation angle of the buffer bar (8) to ninety degrees.

5. The flexible unloading device for a vertical PCB board (17) according to claim 4, characterized in that: The buffer includes: an upper angle buffer (9) and a lower angle buffer (10). The upper angle buffer (9) is disposed on the rotating shaft connecting plate (3) corresponding to the buffer bar (8), and the upper angle buffer (9) is located on one side of the rotating shaft connecting plate (3) and away from the vertical cylinder (2); the upper angle buffer (9) is disposed higher than the buffer bar (8); when the upper end of the buffer bar (8) is rotated to face vertically upward, the upper angle buffer (9) is located on one side close to the upper end of the buffer bar (8); The lower angle buffer (10) is installed at the bottom of the rotating shaft connecting plate (3) corresponding to the buffer bar (8). The lower angle buffer (10) is set lower than the buffer bar (8). When the upper end of the buffer bar (8) is rotated to face the vertical cylinder (2) horizontally, the lower angle buffer (10) is located directly below the upper end of the buffer bar (8).

6. The flexible unloading device for a vertical PCB board (17) according to claim 2, characterized in that: The telescopic gripper includes: a telescopic cylinder (12), a width adjustment plate (13), and a gripper cylinder (15). The telescopic cylinder (12) is horizontally mounted on the cylinder support block (5), and the telescopic cylinder (12) is located on the other side of the cylinder support block (5) relative to the rotating connecting rod (6). The width adjustment plate (13) is vertically installed on the telescopic end of the telescopic cylinder (12), and the width adjustment plate (13) is set perpendicular to the telescopic cylinder (12); The gripper cylinder (15) is movably mounted on the width adjustment plate (13); the gripper cylinder (15) is equipped with two gripper ends (16) arranged side by side, and the gripping direction of the two gripper ends (16) is vertically upward; the gripper cylinder (15) is used to control the two gripper ends (16) to perform gripping actions. The telescopic cylinder (12) is used to control the horizontal displacement of the width adjustment plate (13).

7. The flexible unloading device for a vertical PCB board (17) according to claim 6, characterized in that: A strip hole (14) is provided on the width adjustment plate (13) along the width direction of the width adjustment plate (13). The strip hole (14) passes horizontally through the width adjustment plate (13). One side of the gripper cylinder (15) is detachably connected to the strip hole (14).

8. The flexible unloading device for a vertical PCB board (17) according to claim 6, characterized in that: The rotating link (6) is J-shaped.

9. The flexible unloading device for a vertical PCB board (17) according to claim 8, characterized in that: The concave surface of the rotating connecting rod (6) is positioned towards the vertical cylinder (2), and the convex surface of the rotating connecting rod (6) is positioned towards the telescopic cylinder (12).

10. The flexible unloading device for a vertical PCB board (17) according to claim 5, characterized in that: The upper angle buffer (9) and the lower angle buffer (10) are respectively connected to the rotating shaft connecting plate (3) through the buffer connecting plate (11).

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