A fine machining system for precision cutting chain track links

Abstract

The present invention discloses a fine cutting and finishing system for chain track links, belonging to the technical field of machining machine tools. It includes a milling frame, on the top of which a milling component is fixedly connected. An operation shell is fixedly connected to the top of the milling frame. Inside the operation shell, an upper blanking module and a lower blanking module are arranged in an up-and-down distribution. The lower blanking module includes a lower support seat and a stepped support block. The stepped support block is positioned inside the operation shell through the lower support seat. In the present invention, the chain track link is positioned stably between four hole area alignment modules. Four water diversion positioning rings in the upper and lower positions respectively fasten the tread surface and the plate joint surface of the chain track link. Flushing water and gas are directly released to different areas of the surface of the chain track link through the densely distributed release holes on the lower blanking module and the upper blanking module, to stage-process the flaw detection magnetic powder on the surface of the chain track link and dry the chain track link. The chain track link remains in a state where the end face and the slot holes are largely exposed, improving the pre-treatment and milling and finishing effects of the chain track link.

Description

Technical Field

[0001] The invention relates to the technical field of machining machine tools, and in particular to a precision-cutting chain track segment finishing system. Background Art

[0002] The chain track segment is made by cutting, die forging, punching and trimming, heat treatment, magnetic particle inspection, milling tread and plate joint, milling two end holes and middle square slot, etc. After the magnetic particle inspection, the chain track segment is moved to the milling machine for finishing of the tread, plate joint and each slot hole. The chain track segment is an asymmetric part with one end horizontal and one end raised, so that after the magnetic particle inspection, some magnetic particles of flaw detection remain on the tread, plate joint and each slot of the chain track segment. After being washed together in large quantities, the chain track segment is transported to the milling machine for finishing of the surface. The chain track segment is clamped and fixed from the outside by a clamping piece with an adapted shape, so that the surface of the chain track segment is covered in a large area, which is easy to cause regional obstruction of the tread, plate joint and the edge of the slot hole of the chain track segment. In the existing public patent CN114434186A (a clamping device for finishing of track links), the support assembly clamps and positions the track links from different areas through the operation of each hydraulic cylinder. In the existing public document (push cutting and fixture design of square groove of track links of engineering machinery), the track links are clamped and positioned from the outside and the middle square groove is milled by a matching special pusher and special fixture, so as to improve the effect of milling the tread, plate joint and slot of the track links. However, the pretreatment of the track links before milling the tread, plate joint and slot is still carried out in batches outside the machine tool, and it is impossible to effectively pretreat the surface of the track links and the slot before milling the track links. At the same time, the exposed area during the finishing process of the track links is insufficient, so that it is impossible to effectively finish the different surfaces of the track links and the various parts of the slot, thereby affecting the milling effect of the tread, plate joint and slot of the track links, and affecting the finishing efficiency of the track links. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a precision cutting chain track segment finishing system, which separates an independent space above the milling frame by setting an operating shell for the fine processing of the chain track segment after magnetic particle flaw detection, and the lower ejection module and the upper ejection module adapted to the shape of the chain track segment cooperate with multiple side clamps on the outside to keep the chain track segment in a stable state and positioned between the four hole area alignment modules. The four water diversion positioning rings in the upper and lower positions respectively tighten the chain track segment tread and the plate interface, effectively positioning and tightening the chain track segment, and through the dense release The hole directly releases flushing water and gas to different areas of the chain track segment surface, stages the chain track segment surface flaw detection magnetic powder and dries the chain track segment, effectively pre-treats the chain track segment, and the upper ejection module is driven by the flipping and positioning module to flip over in the operating shell, changing the state of the chain track segment to keep the end face and the slot hole exposed over a large area. After milling is completed, the chain track segment can be stably reset between the upper ejection module and the lower ejection module for post-milling processing, thereby improving the pre-treatment and milling finishing effects of the chain track segment to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A precision-cutting chain rail segment finishing system comprises a milling frame, a milling part is fixedly connected to the top of the milling frame, an operating shell is fixedly connected to the top of the milling frame, an upper ejecting module and a lower ejecting module distributed up and down are arranged inside the operating shell, the lower ejecting module comprises a lower supporting seat and a step supporting block, the step supporting block is positioned inside the operating shell through the lower supporting seat, the upper ejecting module comprises a first ejecting shell, a second ejecting shell, a connecting shell and a square groove processing bellows, the second ejecting shell is positioned on the side of the first ejecting shell through the connecting shell, the square groove processing bellows is fixed to the first ejecting shell The outer wall of the shell; the lower lifting module and the upper lifting module are each provided with two hole area alignment modules, the hole area alignment modules include a water diversion positioning ring and a connecting pipe, and the water diversion positioning ring is positioned between the lower lifting module and the upper lifting module through the connecting pipe; the operating shell is provided with a flipping and positioning module, the flipping and positioning module includes a side plate, a flipping driving member and a rotating frame, the rotating frame rotates inside the operating shell through the side plate and the flipping driving member, the rotating frame is fixedly connected to the first lifting shell, and the top of the milling frame is fixedly connected with symmetrically distributed water pumps and air pumps.

[0006] Furthermore, the lower supporting seat is fixedly connected to the inside of the operating shell, and the stepped supporting block is fixedly connected to the top of the lower supporting seat.

[0007] Further, the first top shell corresponds to being directly above the protruding portion of the step support block, the connecting shell is fixedly connected to the outer wall of the first top shell, and the other end of the connecting shell is fixedly connected to the outer wall of the second top shell.

[0008] Furthermore, the two side panels are symmetrically fixed on the outer wall of the operating shell, the rotating frame is rotatably connected between the two side panels, the flip driving member is fixedly connected to the outer wall of the side panel, and the output end of the flip driving member is fixedly connected to the corresponding end of the rotating frame.

[0009] Furthermore, the connecting pipe is fixedly connected to the outer wall of the water diversion positioning ring, and the four water diversion positioning rings are respectively fixedly connected to the lower supporting seat, the stepped supporting block, the first top shell and the second top shell.

[0010] Furthermore, the hole area alignment module on the upper lifting module is aligned with the hole area alignment module on the lower lifting module from above, the four water diversion positioning rings correspond to the sleeve holes and pin shaft holes of the chain track segments respectively, and the opening parts of the water diversion positioning rings are close to the edge areas of the corresponding holes.

[0011] Furthermore, the lower supporting seat, the first top shell, the second top shell and the outer wall of the connecting shell are all fixedly connected with side clamping plates, and the ends of the two corresponding side clamping plates are tightly attached to each other.

[0012] Furthermore, a corrugated baffle shell is fixedly connected to the top of the operating shell, and the corrugated baffle shell shields the lower ejection module and the upper ejection module from the outside.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention separates an independent space above the milling frame by arranging an operating shell for fine processing of the chain track segment after magnetic particle flaw detection. The lower ejection module and the upper ejection module adapted to the shape of the chain track segment cooperate with multiple side clamps on the outside to adjust the state and clamp the entered chain track segment, so that the chain track segment can be kept in a stable state and positioned between the four hole area alignment modules. The four water diversion positioning rings in the upper and lower positions respectively tighten the tread of the chain track segment and the plate interface, effectively positioning and tightening the chain track segment. The output ends of the water pump and the air pump are respectively connected to the lower ejection module and the upper ejection module. Through the densely distributed release The holes are directly released to release flushing water and gas to different areas of the chain track segment surface, and the surface of the chain track segment is processed by magnetic powder for flaw detection in stages and the chain track segment is dried. The chain track segment can be effectively pre-processed before milling the end face and slot hole of the chain track segment. The upper ejection module can be flipped in the operating shell through the drive of the flipping and positioning module, and the state of the chain track segment is changed to keep the end face and slot hole of the chain track segment exposed in a large area. After milling, the chain track segment can be stably reset between the upper ejection module and the lower ejection module, and each area of ​​the chain track segment is post-milled to improve the pre-treatment and milling finishing effect of the chain track segment, and improve the finishing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution in the embodiment, the drawings in the embodiment are briefly introduced below.

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure inside the operating shell of the present invention;

[0018] Figure 3 It is a schematic diagram of the partially separated structure of the present invention;

[0019] In the figure: 1. milling frame; 11. milling part; 12. operating shell; 13. corrugated baffle shell; 2. lower ejector module; 21. lower support seat; 22. step support block; 3. upper ejector module; 31. first ejector shell; 32. second ejector shell; 33. connecting shell; 34. square groove processing bellows; 4. hole area alignment module; 41. water diversion positioning ring; 42. connecting pipe; 5. flip adjustment module; 51. side plate; 52. flip drive member; 53. rotating frame; 6. water pump; 7. air pump; 8. side clamp. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solution in the embodiment of the present invention in conjunction with the accompanying drawings in the embodiment of the present invention. Figures 1 to 3 The detailed description of the structure will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0021] See also Figure 1 to Figure 3In an embodiment of the present invention, a precision-cutting chain rail segment finishing system includes a milling frame 1, a milling part 11 is fixedly connected to the top of the milling frame 1, an operating shell 12 is fixedly connected to the top of the milling frame 1, an upper ejecting module 3 and a lower ejecting module 2 are arranged inside the operating shell 12, the lower ejecting module 2 includes a lower support seat 21 and a step support block 22, the step support block 22 is positioned inside the operating shell 12 through the lower support seat 21, the upper ejecting module 3 includes a first ejecting shell 31, a second ejecting shell 32, a connecting shell 33 and a square groove processing bellows 34, the second ejecting shell 32 is positioned on the side of the first ejecting shell 31 through the connecting shell 33, and the square groove processing bellows 34 4 is fixed on the outer wall of the first top shell 31, two hole area alignment modules 4 are respectively provided on the lower top material module 2 and the upper top material module 3, the hole area alignment module 4 includes a water diversion positioning ring 41 and a connecting pipe 42, the water diversion positioning ring 41 is positioned between the lower top material module 2 and the upper top material module 3 through the connecting pipe 42, a flip adjustment module 5 is provided on the operating shell 12, the flip adjustment module 5 includes a side plate 51, a flip driving member 52 and a rotating frame 53, the rotating frame 53 is rotated inside the operating shell 12 through the side plate 51 and the flip driving member 52, the rotating frame 53 is fixedly connected to the first top shell 31, and a symmetrically distributed water pump 6 and an air pump 7 are fixedly connected to the top of the milling frame 1.

[0022] The milling frame 1 cooperates with the milling part 11 fixed on the top, and the milling part 11 performs milling finishing on the tread, plate joint and slot of the chain track segment placed on the milling frame 1. The top of the milling frame 1 is fixedly connected to the operating shell 12, and the operating shell 12 separates an independent space above the milling frame 1 for finishing of the chain track segment after magnetic particle inspection. The top of the operating shell 12 is fixedly connected to the corrugated baffle shell 13, and the corrugated baffle shell 13 can stretch when subjected to force to adjust the shielding area of ​​the corrugated baffle shell 13, so that the corrugated baffle shell 13 can shield the lower ejection module 2 and the upper ejection module 3 from the outside, and at the same time, the corrugated baffle shell 13 can shield the chain track segment, so as to effectively perform finishing of the chain track segment at various stages in an independent space.

[0023] The lower ejection material module 2 and the upper ejection material module 3 are both arranged inside the operating shell 12, and the lower ejection material module 2 is composed of a lower support seat 21 and a stepped support block 22. The lower support seat 21 is fixedly connected inside the operating shell 12, and the stepped support block 22 is fixedly connected to the top of the lower support seat 21, so that the lower ejection material module 2 is stably positioned inside the operating shell 12. The upper ejection material module 3 is arranged directly above the lower ejection material module 2, and the upper ejection material module 3 is composed of a first ejection shell 31, a second ejection shell 32, a connecting shell 33 and a square groove processing bellows 34. The first ejection shell 31 corresponds to the protruding part of the stepped support block 22, and the connecting shell 33 is fixedly connected to the outer wall of the first ejection shell 31, and the other end of the connecting shell 33 is fixedly connected to the outer wall of the second ejection shell 32, and the square groove processing bellows 34 is fixed on the outer wall of the first ejection shell 31, and the first ejection shell 31, the second ejection shell 32, the connecting shell 33 and the square groove processing bellows 34 are stably combined.

[0024] The flipping and positioning module 5 is located at the rear of the upper ejecting module 3 and the lower ejecting module 2, and is used to connect and position the upper ejecting module 3. The flipping and positioning module 5 is composed of a side plate 51, a flipping driving member 52 and a rotating frame 53. The two side plates 51 are symmetrically fixed on the outer wall of the operating shell 12, the rotating frame 53 is rotatably connected between the two side plates 51, the flipping driving member 52 is fixedly connected to the outer wall of the side plate 51, the output end of the flipping driving member 52 is fixedly connected to the corresponding end of the rotating frame 53, and the rotating frame 53 is fixedly connected to the first ejecting shell 31, so that the flipping and positioning module 5 is stably connected to the upper ejecting module 3. When the flipping drive member 52 is started, it can control the rotating frame 53 to rotate inside the operating shell 12, so that the upper lifting material module 3 follows the rotating frame 53 to flip inside the operating shell 12, thereby achieving the effect of flexibly adjusting the position of the upper lifting material module 3 inside the operating shell 12, and can position the upper lifting material module 3 directly above the lower lifting material module 2, and at the same time can allow the upper lifting material module 3 to flip backwards to move away from the lower lifting material module 2.

[0025] The four hole area alignment modules 4 are symmetrically distributed up and down, the two upper hole area alignment modules 4 are connected to the upper ejection module 3, and the two lower hole area alignment modules 4 are connected to the lower ejection module 2. The hole area alignment module 4 is composed of a water diversion positioning ring 41 and a connecting pipe 42, the connecting pipe 42 is fixedly connected to the outer wall of the water diversion positioning ring 41, and the four water diversion positioning rings 41 are respectively fixedly connected to the lower support seat 21, the stepped support block 22, the first ejection shell 31 and the second ejection shell 32, so that the four water diversion positioning rings 41 are sequentially positioned in the corresponding area between the lower ejection module 2 and the upper ejection module 3 through the corresponding connecting pipes 42. The hole area alignment module 4 on the upper ejection module 3 is aligned with the hole area alignment module 4 on the lower ejection module 2 from above, and the four water diversion positioning rings 41 correspond to the shaft sleeve hole and the pin shaft hole of the chain track section respectively, so that the four water diversion positioning rings 41 in the upper and lower positions can be close to the chain track section tread and the plate interface from the shaft sleeve hole and the pin shaft hole area of ​​the chain track section, so as to effectively tighten the chain track section from the two end positions of the chain track section through the four hole area alignment modules 4, thereby effectively positioning the chain track section between the upper ejection module 3 and the lower ejection module 2, ensuring that the chain track section is stably processed and finished. The outer walls of the lower support seat 21, the first ejection shell 31, the second ejection shell 32 and the connecting shell 33 are fixedly connected with side clamps 8, and the ends of the two corresponding side clamps 8 above and below are close to each other. The multiple side clamps 8 cooperate with each other to clamp the chain track section from the outside of the chain track section, thereby improving the clamping and positioning effect of the chain track section.

[0026] The water pump 6 and the air pump 7 are symmetrically fixed on the top of the milling machine frame 1. The two flushing pipes at the output end of the water pump 6 are respectively connected to the lower support seat 21 and the second top shell 32. When the water pump 6 is started, flushing water can be released into the lower support seat 21 and the second top shell 32, so that the flushing water flows in the lower top material module 2 and the upper top material module 3, and the flushing water is directly released to the positioned chain track section through the release holes densely distributed on the lower top material module 2 and the upper top material module 3, so as to effectively deal with the residual flaw detection magnetic powder in various areas of the chain track section surface. The two air pipes at the output end of the air pump 7 are respectively connected to the step support block 22 and the first top shell 31. When the air pump 7 is started, gas can be released into the step support block 22 and the first top shell 31, so that the gas flows in the lower top material module 2 and the upper top material module 3, and the gas is directly released to the chain track section through the release holes densely distributed on the lower top material module 2 and the upper top material module 3, so as to dry the chain track section after the residual flaw detection magnetic powder is treated. The connecting pipe 42 can guide flushing water and gas into the water diversion positioning ring 41, which is released by the water diversion positioning ring 41. The opening part of the water diversion positioning ring 41 is close to the edge area of ​​the corresponding hole. The water diversion positioning ring 41 can effectively process the corresponding area from the edge area of ​​the sleeve hole and the pin shaft hole. The vertical pipe head part of the square groove processing bellows 34 extends to the middle square groove of the chain track segment to effectively process the square groove area from the inside of the middle square groove of the chain track segment, which can improve the effect of the pre-milling treatment of the chain track segment.

[0027] The chain track segment after magnetic particle flaw detection is finely processed in an independent space in the operating shell 12. The lower ejector module 2 and the upper ejector module 3 adapted to the shape of the chain track segment cooperate with multiple side clamps 8 on the outside to adjust the state and clamp the incoming chain track segment, so that the chain track segment is positioned between the four hole area alignment modules 4 in a stable state. The four water diversion positioning rings 41 in the upper and lower positions respectively tighten the chain track segment tread and the plate interface, which can effectively position and tighten the chain track segment. The water pump 6 and the air pump 7 operate to transport flushing water and gas into the lower ejector module 2 and the upper ejector module 3, and release flushing water and gas directly to different areas of the chain track segment surface through the densely distributed release holes on the lower ejector module 2 and the upper ejector module 3, so as to effectively stage the flaw detection magnetic powder on the chain track segment surface and dry the chain track segment, and can effectively pre-treat the chain track segment before milling the end face and slot of the chain track segment. The upper feed module 3 can be flipped in the operating shell 12 by the drive of the flipping and positioning module 5, so that the chain track segment remains positioned above the lower feed module 2 and the tread of the chain track segment is exposed for milling of the tread and the slot. The chain track segment can be flipped backward along with the upper feed module 3, so that the chain track segment is flipped over to expose the plate interface and stably positioned on the upper feed module 3, and the chain track segment maintains a state in which the end face and the slot are exposed over a large area, so that the milling part 11 can effectively perform milling operations on various end face areas and slots of the chain track segment. After the milling and finishing of the chain track segment is completed, the flipping drive part 52 re-drives the rotating frame 53 to operate, so that the chain track segment can be stably reset between the upper feed module 3 and the lower feed module 2, so as to re-process various areas of the chain track segment, improve the pretreatment and milling finishing effects of the chain track segment, and improve the finishing efficiency.

[0028] The working principle of the present invention is as follows: the chain track segment after magnetic particle flaw detection moves to the top of the lower ejection material module 2, the two water diversion positioning rings 41 on the lower ejection material module 2 hold the chain track segment from the bottom, the upper ejection material module 3 flips over to the top of the chain track segment, the two water diversion positioning rings 41 on the upper ejection material module 3 press the chain track segment from the top, the multiple side clamping plates 8 on the sides of the upper ejection material module 3 and the lower ejection material module 2 clamp the chain track segment from the side, the four water diversion positioning rings 41 in the upper and lower positions respectively tighten the chain track segment tread and the plate interface, and position and tighten the chain track segment inside the operating shell 12, the water pump 6 and the air pump 7 work in sequence, and convey flushing water and gas into the lower ejection material module 2 and the upper ejection material module 3 in sequence, and release the flushing water and gas directly to different areas on the surface of the chain track segment through the densely distributed release holes on the lower ejection material module 2 and the upper ejection material module 3. Gas, stage-by-stage treatment of the track segment surface flaw detection magnetic powder and drying of the track segment, pre-treatment of the track segment before milling the track segment end face and slot hole, the upper ejector module 3 flips backward in the operating shell 12, so that the track segment remains positioned above the lower ejector module 2 and exposes the tread of the track segment for milling of the tread and slot hole, and after the upper ejector module 3 is reset, it flips backward with the track segment, so that the track segment is flipped over to expose the plate joint and repositioned, the track segment keeps the end face and slot hole exposed in a large area, and the milling part 11 performs milling operations on various areas of the track segment end face and the slot hole, and after the fine milling of the track segment is completed, the flipping drive part 52 re-drives the rotating frame 53 to operate, so that the track segment is reset between the upper ejector module 3 and the lower ejector module 2, and various areas of the track segment are post-milled.

[0029] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A precision cutting rail segment finishing system, comprising a milling frame (1), a milling part (11) being fixedly connected to the top of the milling frame (1), characterized in that: The top of the milling machine frame (1) is fixedly connected to an operating shell (12), and an upper ejection module (3) and a lower ejection module (2) are arranged inside the operating shell (12) and are distributed up and down. The lower ejection module (2) comprises a lower support seat (21) and a step support block (22), and the step support block (22) is positioned inside the operating shell (12) through the lower support seat (21). The upper ejection module (3) comprises a first ejection shell (31), a second ejection shell (32), a connecting shell (33) and a square groove processing bellows (34), and the second ejection shell (32) is positioned on the side of the first ejection shell (31) through the connecting shell (33), and the square groove processing bellows (34) is fixed to the outer wall of the first ejection shell (31); The lower ejection module (2) and the upper ejection module (3) are each provided with two hole area alignment modules (4), the hole area alignment module (4) comprising a water diversion positioning ring (41) and a connecting pipe (42), the water diversion positioning ring (41) being positioned between the lower ejection module (2) and the upper ejection module (3) via the connecting pipe (42); The operating shell (12) is provided with a flipping and positioning module (5), the flipping and positioning module (5) comprising a side plate (51), a flipping driving member (52) and a rotating frame (53), inside the operating shell (12), the rotating frame (53) rotates with the flipping driving member (52) via the side plate (51), the rotating frame (53) is fixedly connected to the first top shell (31), and a symmetrically distributed water pump (6) and an air pump (7) are fixedly connected to the top of the milling machine frame (1).

2. A precision cutting rail segment finishing system according to claim 1, characterized in that: The lower support seat (21) is fixedly connected to the inside of the operating shell (12), and the stepped support block (22) is fixedly connected to the top of the lower support seat (21).

3. A precision cutting rail segment finishing system according to claim 1, characterized in that: The first top shell (31) corresponds to being located directly above the protruding portion of the step support block (22); the connecting shell (33) is fixedly connected to the outer wall of the first top shell (31); and the other end of the connecting shell (33) is fixedly connected to the outer wall of the second top shell (32).

4. A precision cutting rail segment finishing system according to claim 1, characterized in that: The two side panels (51) are symmetrically fixed on the outer wall of the operating shell (12); the rotating frame (53) is rotatably connected between the two side panels (51); the flip driving member (52) is fixedly connected to the outer wall of the side panel (51); and the output end of the flip driving member (52) is fixedly connected to the corresponding end of the rotating frame (53).

5. A precision cutting rail segment finishing system according to claim 1, characterized in that: The connecting pipe (42) is fixedly connected to the outer wall of the water diversion positioning ring (41), and the four water diversion positioning rings (41) are respectively fixedly connected to the lower support seat (21), the stepped support block (22), the first top shell (31) and the second top shell (32).

6. A precision cutting rail segment finishing system according to claim 1, characterized in that: The hole area alignment module (4) on the upper material lifting module (3) is aligned with the hole area alignment module (4) on the lower material lifting module (2) from above, and the four water diversion positioning rings (41) respectively correspond to the shaft sleeve holes and the pin shaft holes of the chain track segments, and the opening parts of the water diversion positioning rings (41) are closely attached to the edge areas of the corresponding holes.

7. A precision cutting rail segment finishing system according to claim 1, characterized in that: The outer walls of the lower support seat (21), the first top shell (31), the second top shell (32) and the connecting shell (33) are all fixedly connected with side clamping plates (8), and the ends of the two corresponding side clamping plates (8) are tightly attached to each other.

8. A precision cutting rail segment finishing system according to claim 1, characterized in that: The top of the operating shell (12) is fixedly connected to a corrugated baffle shell (13), and the corrugated baffle shell (13) shields the lower ejection module (2) and the upper ejection module (3) from the outside.

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