Feeding and discharging grabbing mechanism based on numerical control machining center

Abstract

The invention discloses a feeding and discharging grabbing mechanism based on a numerical control machining center, and relates to the technical field of numerical control machining centers. According to the feeding and discharging grabbing mechanism based on the numerical control machining center, through cooperation between the positioning base plate and the clamping arm, the stretching length of the clamping arm can be adjusted in the feeding and discharging grabbing process of a workpiece, on one hand, the clamping effect can be guaranteed, and the feeding and discharging grabbing mechanism can be suitable for clamping work of workpieces of different sizes; and meanwhile, the distance between the workpiece and the positioning base plate can be adjusted in the transferring process, placement is facilitated, the positioning base plate and the corresponding clamping arms can be driven to rotate in the operation process through cooperation of the driving assembly, the clamping angle can be adjusted, the application range of the equipment is effectively widened, and the operation efficiency of the equipment is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control machining centers, in particular to a material loading and unloading grabbing mechanism for numerical control machining centers. Background Art

[0002] CNC machining center is a high-efficiency automated machine tool composed of mechanical equipment and CNC system suitable for machining complex parts. CNC machining center is one of the most productive and widely used CNC machine tools in the world. It has strong comprehensive processing ability, can complete more processing content after the workpiece is clamped once, and has high processing accuracy. For batch workpieces with medium processing difficulty, its efficiency is 5 to 10 times that of ordinary equipment. In particular, it can complete many processing that ordinary equipment cannot complete, and is more suitable for single-piece processing with complex shapes and high precision requirements or small and medium batch multi-variety production; refer to the Chinese patent, announcement number: "CN117655794A" "A loading and unloading mechanism and CNC machine tool", the patent points out that the loading and unloading mechanism of the existing CNC machine tool has low clamping efficiency, which affects the processing efficiency; but the equipment still has the problem of small scope of application and poor operation convenience. In this regard, we propose a loading and unloading grabbing mechanism based on CNC machining center to solve the above problems. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a loading and unloading material grabbing mechanism for a CNC machining center, which solves the problems raised in the above-mentioned background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a material loading and unloading grasping mechanism based on a CNC machining center, comprising a clamping plate, a connecting flange is provided above the clamping plate, the connecting flange is used to connect to a mechanical arm, and an adjustment component is provided between the clamping plate and the connecting flange, which is used to adjust the clamping position of the clamping plate;

[0005] The outer side of the clamping disk is provided with a plurality of positioning base plates, and clamping arms are slidably installed on both sides of the positioning base plates. An annular adjustment frame is rotatably connected to the inside of the clamping disk, and a plurality of arc-shaped transmission sheets are fixedly installed on the outer side of the annular adjustment frame. A telescopic support is fixedly installed on one end of the clamping arm located inside the clamping disk, and a sliding frame is fixedly installed on the end of the telescopic support. A conical member is fixedly installed on the outer side of the sliding frame, and a spherical body is rotatably connected to the end of the conical member. The spherical body and the arc-shaped transmission sheet are fitted together, and are used to adjust the extension length of the clamping arm through the arc-shaped transmission sheet running with the annular adjustment frame;

[0006] The inner side of the clamping arm is rotatably connected to a plurality of clamping plates, a plurality of voice coil clamping motors are fixedly installed inside the clamping arm, a driving frame is fixedly installed on the output end of the voice coil clamping motor, and the driving frame is in contact with the outer sides of the plurality of clamping plates to push the plurality of clamping plates to move toward the workpiece to clamp the workpiece.

[0007] Preferably, a driving assembly is provided inside the clamping disk for driving the positioning base plate and the corresponding clamping arm to rotate so as to adjust the clamping angle. Arc-shaped extension plates are fixedly installed on the upper and lower sides of the arc-shaped transmission plate, so that the conical part can move along the arc-shaped extension plate through the cooperation of the spherical body when the clamping angle is adjusted.

[0008] Preferably, the driving assembly includes an adjusting shaft, an annular limit frame is rotatably connected between the positioning substrate and the clamping disk, the adjusting shaft is fixedly connected to the middle part of the positioning substrate, the end of the adjusting shaft penetrates into the clamping disk and is rotatably connected to the clamping disk, a plurality of angle adjustment motors are fixedly installed inside the clamping disk, and the output end of the angle adjustment motor and the end of the adjusting shaft are fixedly sleeved with adjusting gears, and the two adjusting gears are meshed with each other.

[0009] Preferably, voice coil drive motors are provided on both sides of the clamping plate to drive the annular adjustment frame to rotate inside the clamping plate, and a plurality of limit shafts are fixedly installed on the top surface of the annular adjustment frame, and the limit shafts are slidably connected to the inner top of the clamping plate. The voice coil drive motor is fixedly installed on the inner top of the clamping plate, and the output end of the voice coil drive motor is fixedly connected to the corresponding limit shaft.

[0010] Preferably, elastic plates are fixedly mounted on both sides of the interior of the plurality of positioning substrates, the elastic plates are in contact with the corresponding clamping arms, and negative pressure positioning rings are fixedly mounted on the exteriors of the plurality of positioning substrates.

[0011] Preferably, a detection and identification module is fixedly installed on the bottom of the clamping plate, and a sensing module is fixedly installed inside each of the plurality of positioning substrates.

[0012] Preferably, a control module is fixedly mounted on the top surface of the clamping plate.

[0013] Preferably, the adjustment assembly includes a connecting shaft, the end of the connecting shaft is fixedly connected to the clamping disk, the end of the connecting shaft away from the clamping disk is rotatably sleeved with a positioning ring frame, a connecting flange is fixedly installed on the top of the positioning ring frame, a driving motor is fixedly installed inside the positioning ring frame, and the output end of the driving motor and the end of the connecting shaft are fixedly sleeved with a driving gear, and the two driving gears are meshed with each other to drive the connecting shaft and the positioning ring frame to rotate relative to each other.

[0014] Preferably, a fixing plate is fixedly connected to the outer side of the connecting flange, and the fixing plate is used to be assembled to the robotic arm. Fixing plates are fixedly installed on both sides of the interior of the fixing plate, and connecting plate frames are fixedly installed inside the fixing plate and the connecting flange.

[0015] Preferably, an electromagnet is fixedly mounted on one side of the fixing plate close to the connecting flange.

[0016] The present invention provides a material loading and unloading grabbing mechanism for a CNC machining center. Compared with the prior art, it has the following beneficial effects:

[0017] (1) The loading and unloading grasping mechanism based on the CNC machining center can adjust the extension length of the clamping arm during the loading and unloading grasping of the workpiece through the cooperation between the positioning base plate and the clamping arm. On the one hand, it can ensure the clamping effect and can be suitable for clamping workpieces of different sizes. At the same time, it can adjust the distance between the workpiece and the positioning base plate during the transportation process to facilitate placement. And through the cooperation of the driving component, during the operation process, it can drive the positioning base plate and the corresponding clamping arm to rotate to adjust the clamping angle, which effectively improves the application range and operation efficiency of the equipment.

[0018] (2) The loading and unloading grasping mechanism based on the CNC machining center can drive the connecting shaft and the clamping disk to rotate through the cooperation of the driving motor and the driving gear when the robot arm drives the clamping disk to approach the workpiece to be clamped, until the matching clamping arm completes the clamping of the workpiece to be clamped. On the one hand, the clamping convenience is improved, and at the same time, the loading and unloading efficiency of the equipment is improved. At the same time, the connection flange is used to cooperate with the fixed disk to further improve the convenience of disassembly and assembly of the clamping disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 Look at the structural diagram;

[0021] Figure 3 It is a schematic diagram of the structure of the present invention;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the fixing plate and the connecting flange plate of the present invention;

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the clamping disk of the present invention;

[0024] Figure 6 For the present invention Figure 5 The enlarged structural diagram at A in the middle;

[0025] Figure 7 This is a schematic diagram of the positioning substrate and the annular adjustment frame structure of the present invention;

[0026] Figure 8 It is a schematic diagram of the cross-sectional structure of the positioning substrate and the clamping arm of the present invention.

[0027] In the figure: 1. clamping plate; 2. connecting flange; 3. connecting shaft; 301. positioning ring frame; 4. fixed plate; 401. fixing plate; 402. connecting plate frame; 403. electromagnet; 5. driving motor; 6. driving gear; 7. control module; 8. positioning substrate; 801. negative pressure positioning ring; 9. clamping arm; 901. clamping plate; 902. elastic plate; 10. adjusting shaft; 1001. adjusting gear; 11. annular adjusting frame; 1101. limiting shaft; 1102. arc-shaped transmission plate; 1103. arc-shaped extension plate; 12. voice coil driving motor; 13. telescopic support; 14. sliding frame; 15. conical member; 1501. spherical body; 16. annular limiting frame; 17. detection and identification module; 18. voice coil clamping motor; 1801. driving frame. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. 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.

[0029] See also Figure 1-Figure 8 The present invention provides two technical solutions, which specifically include the following embodiments:

[0030] Embodiment 1:

[0031] In an embodiment of the present invention, a material loading and unloading grasping mechanism for a CNC machining center includes a clamping plate 1, a connecting flange 2 is provided above the clamping plate 1, and the connecting flange 2 is used to connect to a mechanical arm; the mechanical arm is an existing device and will not be described in detail here;

[0032] In the embodiment of the present invention, a plurality of positioning substrates 8 are provided on the outer side of the clamping disk 1, and clamping arms 9 are slidably installed on both sides of the interior of the positioning substrate 8. An annular adjustment frame 11 is rotatably connected inside the clamping disk 1, and a plurality of arc-shaped transmission sheets 1102 are fixedly installed on the outer side of the annular adjustment frame 11. A telescopic support member 13 is fixedly installed on one end of the clamping arm 9 located inside the clamping disk 1, and a sliding frame 14 is fixedly installed on the end of the telescopic support member 13. A conical member 15 is fixedly installed on the outer side of the sliding frame 14, and a spherical body 1501 is rotatably connected to the end of the conical member 15. The spherical body 1501 and the arc-shaped transmission sheet 1102 are fitted together, and are used to adjust the extension length of the clamping arm 9 through the arc-shaped transmission sheet 1102 running with the annular adjustment frame 11;

[0033] In the embodiment of the present invention, specifically, refer to Figure 5-Figure 7 The spherical body 1501 at the end of the conical member 15 fits with the arc-shaped transmission piece 1102, and the clamping arm 9 can be supported by the telescopic support member 13. When adjusting the length, as the annular adjustment frame 11 rotates clockwise, it can simultaneously drive multiple arc-shaped transmission pieces 1102 to rotate clockwise, so that the conical member 15 can drive the clamping arm 9 to retract through the telescopic support member 13, so as to adjust the extension distance of the clamping arm 9, thereby ensuring the clamping effect and being suitable for clamping workpieces of different sizes;

[0034] In the embodiment of the present invention, the spherical body 1501 at the end of the conical member 15 is slidably connected to the arc-shaped transmission sheet 1102, and an arc-shaped notch adapted to the spherical body 1501 is provided on the outer side of the arc-shaped transmission sheet 1102, and the spherical body 1501 is slidably connected inside the arc-shaped notch;

[0035] In the embodiment of the present invention, specifically, the inner side of the clamping arm 9 is rotatably connected with a plurality of clamping plates 901, a plurality of voice coil clamping motors 18 are fixedly installed inside the clamping arm 9, a driving frame 1801 is fixedly installed at the output end of the voice coil clamping motor 18, and the driving frame 1801 is mutually attached to the outer sides of the plurality of clamping plates 901, so as to push the plurality of clamping plates 901 to move toward the workpiece, so as to clamp the workpiece;

[0036] In the embodiment of the present invention, the voice coil clamping motor 18 is an existing device, which is used to push out the corresponding driving frame 1801. When the mechanical arm drives the clamping plate 1 and the clamping arm 9 to move to the position to be clamped, the voice coil clamping motor 18 is operated to drive the frame 1801 and the clamping plate 901 to operate, thereby realizing the clamping operation of the workpiece.

[0037] In the embodiment of the present invention, the clamping sheet 901 is connected to the end of the clamping arm 9 via a rotating shaft, which is not shown in the figure. When the voice coil clamping motor 18 runs through the frame 1801 to drive the clamping arm 9 to move, the clamping arm 9 can be rotated along the corresponding rotating shaft to achieve the clamping operation of the workpiece.

[0038] In the embodiment of the present invention, a driving assembly is provided inside the clamping disk 1, which is used to drive the positioning base plate 8 and the corresponding clamping arm 9 to rotate, so as to adjust the clamping angle. The upper and lower sides of the arc-shaped transmission sheet 1102 are fixedly mounted with arc-shaped extension sheets 1103, which are used to enable the cone 15 to move along the arc-shaped extension sheet 1103 through the cooperation of the spherical body 1501 when adjusting the clamping angle.

[0039] In the embodiment of the present invention, specifically, the outer side of the arc-shaped extension piece 1103 is provided with an arc-shaped notch which is the same as the outer side of the arc-shaped transmission piece 1102, and the installation position of the arc-shaped extension piece 1103 is located at the end of the arc-shaped transmission piece 1102. When the clamping arm 9 is extended to the limit position, as the positioning substrate 8 and the corresponding clamping arm 9 rotate, the spherical body 1501 at the end of the conical member 15 can slide to the inside of the arc-shaped notch on the outer side of the arc-shaped extension piece 1103, so as to achieve the angle adjustment of the clamped workpiece;

[0040] In the embodiment of the present invention, specifically, the driving assembly includes an adjusting shaft 10, an annular limit frame 16 is rotatably connected between the positioning substrate 8 and the clamping disk 1, the adjusting shaft 10 is fixedly connected to the middle part of the positioning substrate 8, the end of the adjusting shaft 10 penetrates into the clamping disk 1 and is rotatably connected to the clamping disk 1, a plurality of angle adjustment motors are fixedly installed inside the clamping disk 1, the output end of the angle adjustment motor and the end of the adjusting shaft 10 are fixedly sleeved with an adjusting gear 1001, and the two adjusting gears 1001 are meshed with each other;

[0041] In the embodiment of the present invention, specifically, the angle adjustment motor is an existing forward and reverse motor, which is used to drive the adjustment shaft 10 to perform forward or reverse operation, and will not be described in detail here;

[0042] In the embodiment of the present invention, voice coil drive motors 12 are provided on both sides of the inside of the clamping plate 1, which are used to drive the annular adjustment frame 11 to rotate inside the clamping plate 1. A plurality of limit shafts 1101 are fixedly installed on the top surface of the annular adjustment frame 11. The limit shafts 1101 are slidably connected to the inner top of the clamping plate 1. The voice coil drive motor 12 is fixedly installed on the inner top of the clamping plate 1, and the output end of the voice coil drive motor 12 is fixedly connected to the corresponding limit shafts 1101.

[0043] In the embodiment of the present invention, the voice coil drive motor 12 is an existing device, which is used to drive the limiting shaft 1101 to slide along the axis direction of the annular adjustment frame 11, and will not be described in detail here;

[0044] In the embodiment of the present invention, the annular adjustment frame 11 is connected to the inside of the clamping plate 1 through the coordinated rotation of the limiting shaft rod 1101;

[0045] In the embodiment of the present invention, elastic plates 902 are fixedly installed on both sides of the interior of the plurality of positioning substrates 8, the elastic plates 902 are in contact with the corresponding clamping arms 9, and negative pressure positioning rings 801 are fixedly installed on the outer sides of the plurality of positioning substrates 8;

[0046] In the embodiment of the present invention, the elastic plate 902 is provided to avoid affecting the operation of the clamping piece 901 and ensure the clamping effect on the workpiece;

[0047] In the embodiment of the present invention, a detection and identification module 17 is fixedly installed at the bottom of the clamping plate 1, and a sensing module is fixedly installed inside each of the plurality of positioning substrates 8. The detection and identification module 17 is an existing shooting module, which is controlled based on the control module 7 and is used to shoot and identify the label of the workpiece, which will not be described in detail here;

[0048] In the embodiment of the present invention, a control module 7 is fixedly mounted on the top surface of the clamping plate 1 , and the control module 7 implements control based on an existing PLC control module.

[0049] Embodiment 2: Based on Embodiment 1, in the embodiment of the present invention, further, an adjustment component is provided between the clamping plate 1 and the connecting flange 2, for adjusting the clamping position of the clamping plate 1;

[0050] In the embodiment of the present invention, the adjustment assembly includes a connecting shaft 3, the end of the connecting shaft 3 is fixedly connected to the clamping disk 1, the end of the connecting shaft 3 away from the clamping disk 1 is rotatably sleeved with a positioning ring frame 301, the top of the positioning ring frame 301 is fixedly installed with a connecting flange 2, the inside of the positioning ring frame 301 is fixedly installed with a driving motor 5, the output end of the driving motor 5 and the end of the connecting shaft 3 are both fixedly sleeved with a driving gear 6, the two driving gears 6 are meshed with each other, and are used to drive the connecting shaft 3 and the positioning ring frame 301 to rotate relative to each other;

[0051] In the embodiment of the present invention, when the robot arm drives the clamping plate 1 to approach the workpiece to be clamped, the driving motor 5 and the driving gear 6 can be used to drive the connecting shaft 3 and the clamping plate 1 to rotate until the adapted clamping arm 9 completes the clamping of the workpiece to be clamped, thereby improving the clamping convenience and the loading and unloading efficiency of the equipment. At the same time, the connecting flange 2 is used to cooperate with the fixing plate 4 to further improve the convenience of disassembly and assembly of the clamping plate 1.

[0052] In the embodiment of the present invention, specifically, a fixing plate 4 is fixedly connected to the outer side of the connecting flange 2, and the fixing plate 4 is used to be assembled to the robot arm. The fixing plates 401 are fixedly installed on both sides of the inside of the fixing plate 4, and the fixing plate 4 and the connecting flange 2 are fixedly installed with a connecting plate frame 402; an electromagnet 403 is fixedly installed on one side of the fixing plate 4 close to the connecting flange 2, and the electromagnet 403 is an existing device and will not be described in detail here;

[0053] In the embodiment of the present invention, the connection between the fixing plate 4 and the connecting flange plate 2 is realized by the electromagnet 403, so that the disassembly and assembly of the clamping plate 1 can be facilitated.

[0054] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0055] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A material loading and unloading grabbing mechanism for a CNC machining center, comprising a clamping plate (1), characterized in that: A connecting flange (2) is provided above the clamping plate (1), and the connecting flange (2) is used to be connected to the mechanical arm. An adjustment component is provided between the clamping plate (1) and the connecting flange (2), and is used to adjust the clamping position of the clamping plate (1); A plurality of positioning substrates (8) are provided on the outer side of the clamping disk (1), and clamping arms (9) are slidably installed on both sides of the positioning substrates (8). The clamping disk (1) is rotatably connected with an annular adjustment frame (11) inside, and a plurality of arc-shaped transmission sheets (1102) are fixedly installed on the outer side of the annular adjustment frame (11). A telescopic support member (13) is fixedly installed on one end of the clamping arm (9) located inside the clamping disk (1), and a sliding frame (14) is fixedly installed on the end of the telescopic support member (13). A conical member (15) is fixedly installed on the outer side of the sliding frame (14), and a spherical body (1501) is rotatably connected to the end of the conical member (15). The spherical body (1501) and the arc-shaped transmission sheet (1102) are fitted together and are used to adjust the extension length of the clamping arm (9) through the arc-shaped transmission sheet (1102) running along with the annular adjustment frame (11); The inner side of the clamping arm (9) is rotatably connected to a plurality of clamping plates (901); a plurality of voice coil clamping motors (18) are fixedly installed inside the clamping arm (9); a driving frame (1801) is fixedly installed at the output end of the voice coil clamping motor (18); the driving frame (1801) is in contact with the outer sides of the plurality of clamping plates (901) to push the plurality of clamping plates (901) to move toward a workpiece, thereby clamping the workpiece.

2. The material loading and unloading grabbing mechanism for a CNC machining center according to claim 1 is characterized in that: The clamping disk (1) is provided with a driving assembly inside, which is used to drive the positioning base plate (8) and the corresponding clamping arm (9) to rotate, so as to adjust the clamping angle. The upper and lower sides of the arc-shaped transmission plate (1102) are fixedly mounted with arc-shaped extension plates (1103), which are used to enable the conical member (15) to move along the arc-shaped extension plate (1103) through the cooperation of the spherical body (1501) when adjusting the clamping angle.

3. The material loading and unloading grabbing mechanism for a CNC machining center according to claim 2 is characterized in that: The driving assembly comprises an adjusting shaft (10), an annular limiting frame (16) is rotatably connected between the positioning base plate (8) and the clamping plate (1), the adjusting shaft (10) is fixedly connected to the middle part of the positioning base plate (8), the end of the adjusting shaft (10) penetrates into the clamping plate (1) and is rotatably connected to the clamping plate (1), a plurality of angle adjustment motors are fixedly installed inside the clamping plate (1), the output end of the angle adjustment motor and the end of the adjusting shaft (10) are both fixedly sleeved with an adjusting gear (1001), and the two adjusting gears (1001) are meshed with each other.

4. The material loading and unloading grabbing mechanism for a CNC machining center according to claim 1 is characterized in that: Voice coil drive motors (12) are provided on both sides of the clamping plate (1) for driving the annular adjustment frame (11) to rotate inside the clamping plate (1); a plurality of limit shafts (1101) are fixedly installed on the top surface of the annular adjustment frame (11); the limit shafts (1101) are slidably connected to the inner top of the clamping plate (1); the voice coil drive motor (12) is fixedly installed on the inner top of the clamping plate (1); and the output end of the voice coil drive motor (12) is fixedly connected to the corresponding limit shafts (1101).

5. The material loading and unloading grabbing mechanism for a CNC machining center according to claim 1 is characterized in that: Elastic plates (902) are fixedly mounted on both sides of the interior of the plurality of positioning substrates (8), the elastic plates (902) and the corresponding clamping arms (9) are in contact with each other, and negative pressure positioning rings (801) are fixedly mounted on the exteriors of the plurality of positioning substrates (8).

6. The material loading and unloading grabbing mechanism for a CNC machining center according to claim 1, characterized in that: A detection and identification module (17) is fixedly mounted on the bottom of the clamping plate (1), and a sensing module is fixedly mounted inside each of the plurality of positioning substrates (8).

7. The material loading and unloading grabbing mechanism for a CNC machining center according to claim 1 is characterized in that: A control module (7) is fixedly mounted on the top surface of the clamping plate (1).

8. The material loading and unloading grabbing mechanism for a CNC machining center according to claim 1 is characterized in that: The adjustment assembly comprises a connecting shaft (3), the end of which is fixedly connected to the clamping disk (1), the end of which away from the clamping disk (1) is rotatably sleeved with a positioning ring frame (301), the top of which is fixedly mounted with a connecting flange (2), the interior of which is fixedly mounted with a driving motor (5), the output end of the driving motor (5) and the end of the connecting shaft (3) are both fixedly sleeved with a driving gear (6), the two driving gears (6) are meshed with each other, and are used to drive the connecting shaft (3) and the positioning ring frame (301) to rotate relative to each other.

9. The material loading and unloading grabbing mechanism for a CNC machining center according to claim 8, characterized in that: A fixing plate (4) is fixedly connected to the outer side of the connecting flange (2), and the fixing plate (4) is used to be assembled to the robot arm. Fixing plates (401) are fixedly installed on both sides of the interior of the fixing plate (4), and connecting plate frames (402) are fixedly installed inside the fixing plate (4) and the connecting flange (2).

10. The material loading and unloading grabbing mechanism for a CNC machining center according to claim 9, characterized in that: An electromagnet (403) is fixedly mounted on one side of the fixed plate (4) close to the connecting flange (2).

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