Automatic press-fitting device for middle shell

Abstract

The utility model relates to the technical field of turbochargers, in particular to an automatic press-fitting device for a middle shell, which comprises a stand, a rotary table mounted on the stand and a supporting part positioned below the rotary table, a plurality of bearing components are mounted on the rotary table, and a feeding component and a press-fitting component are mounted on the stand; the bearing assembly comprises double racks fixed to the rotary table. According to the automatic press-fitting device for the middle shell, the middle shell is placed in the bearing assembly in sequence through the feeding assembly, the bottom of a product is supported through the supporting cylinder, and then the pushing part drives the two inner blocks to be relatively fixed until the inner blocks are located above the sides of the middle shell, so that the limiting effect is achieved; and then the feeding assembly places the bearing seat to the designated position of the middle shell, and the rotary table rotates to drive a product to be located below the press-fitting assembly to complete press-fitting operation, so that automatic operation can be achieved, meanwhile, the production efficiency and the press-fitting quality are improved, and safety can also be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of turbochargers, and particularly relates to an automatic intermediate housing pressing device. Background Art

[0002] A turbocharger is a device used to increase the intake pressure of an engine. By utilizing the exhaust gas discharged from the engine to drive a turbine to compress the intake air, the power output of the engine is improved. VNT technology allows the turbocharger to change the opening degree of its nozzles at different engine speeds to optimize the supercharging effect. The intermediate housing is an important component in the turbocharger. It connects the turbine and the compressor parts and usually contains bearings for supporting the turbine shaft. During the assembly process, the intermediate housing needs to be precisely fitted and fixed with other components to ensure the stable operation and efficient work of the turbocharger.

[0003] During the pressing process, it is necessary to manually press the intermediate housing and the bearing housing. Therefore, it is necessary to manually clamp and fix the intermediate housing, and at the same time, it is also necessary to place the bearing housing in the designated position to complete the pressing. Manual operation takes a long time and reduces production efficiency. Manual installation may lead to unstable installation quality, such as uneven installation, insufficient fastening force, etc. At the same time, manual operation may cause hand injuries or other safety problems to workers. Content of the Utility Model

[0004] To achieve the above object, the utility model provides the following technical solution: an automatic intermediate housing pressing device, which includes a frame and a turntable installed on the frame, and a support part arranged below the turntable. A plurality of bearing components are installed on the turntable, and a feeding component and a pressing component are installed on the frame;

[0005] The bearing component includes a double-stage frame fixed on the turntable. A support cylinder is fixed on the top of the lower stage of the double-stage frame, and two side blocks are fixed on the top of the upper stage and a hole opposite to the support cylinder is provided. A sleeve block is fixed on one side of each of the two side blocks facing each other. An inner block is slidably connected to the inside of the sleeve block, and a pushing part connected to the two inner blocks is installed on the back of the upper stage.

[0006] Further, the pushing part includes a linear module installed on the back of the upper stage. A moving plate is fixed to the moving end of the linear module. Two inclined rods are hinged to the moving plate. A convex block penetrating through the sleeve block is formed on one side of the inner block, and the convex block is hinged to one end of the inclined rod.

[0007] Further, a table block is fixed on the top of the lower stage of the double-stage frame. An inserting block and a jacking block are slidably connected inside the table block, and the jacking block is located above the inserting block. The opposite sides of the jacking block and the inserting block are both in a matching inclined shape. A pushing block cylinder connected to the inserting block is installed on one side of the table block.

[0008] Further, the feeding component includes a top plate fixed to the bottom of the top table of the stand. A lower pushing cylinder is installed on the top plate. A front pushing cylinder is installed at the ejecting end of the lower pushing cylinder. A pushing plate is fixed at the ejecting end of the front pushing cylinder. A clamping cylinder is installed at the bottom of the pushing plate.

[0009] Further, the press-fitting component includes a vertical plate fixed to the bottom of the upper table of the double table stand. A jacking cylinder is installed on the back of the vertical plate. The ejecting end of the jacking cylinder is fixed with a jacking plate that slides with the vertical plate. A lower pushing block is fixed on the front of the jacking plate. A detection pressing head is installed at the top of the lower pushing block.

[0010] Further, a fixing plate is installed at the top of the jacking plate. A side pushing cylinder is installed on the fixing plate. The ejecting end of the side pushing cylinder is fixed with a side pushing plate connected to the lower pushing block. The lower pushing block is slidably connected to the jacking plate.

[0011] Further, a plurality of through holes are formed in the table surface of the turntable, and a positioning cylinder that can extend into the through holes is installed on the lower table surface of the turntable. The supporting part includes a plurality of vertical frames fixed to the top of the lower table of the stand. A supporting cylinder is installed on the vertical frame. The top of the supporting cylinder is fixed with a supporting plate.

[0012] Further, a rotation detection component is installed on the stand. The rotation detection component is divided into a lower pushing detection group and an upper pushing rotation group. The lower pushing detection group is installed at the bottom of the upper table of the stand, and the upper pushing rotation group is installed at the top of the lower table of the stand.

[0013] Further, the lower pushing detection group includes a connecting plate fixed to the bottom of the upper table of the stand. A back pushing cylinder is installed on the back of the connecting plate. The ejecting end of the back pushing cylinder is fixed with a back pushing plate that slides with the connecting plate. A plate table and two groups of visual detection devices extending downward are fixed at the top of the back pushing plate. A ejecting cylinder is rotatably installed at the top of the plate table. The ejecting end of the ejecting cylinder is fixed with a ejecting rod passing through the back pushing plate. A ejecting head is installed at the bottom of the ejecting rod.

[0014] Further, the upper pushing rotation group includes a bottom plate fixed to the top of the lower table of the stand. A bottom pushing cylinder is installed on the bottom plate. The ejecting end of the bottom pushing cylinder is fixed with a T-shaped plate that slides with the bottom plate. A double plate is fixed on the T-shaped plate. A driving motor is installed on the double plate. The rotating end of the driving motor is fixed with a rotating head that can extend into the inside of the support cylinder.

[0015] Compared with the prior art, the technical solution of the present application has the following beneficial effects:

[0016] This intermediate shell automatic press-fitting device places the intermediate shell into the bearing component through the feeding component successively. The bottom of the product is supported by the support cylinder, and then the pushing part drives the two inner blocks to move relative to each other until the inner blocks are above the side of the intermediate shell, thus playing a limiting role. Then the feeding component places the bearing seat at the designated position of the intermediate shell, and the turntable rotates to drive the product to be located below the press-fitting component to complete the press-fitting operation, which can achieve automatic operation, improve the production efficiency and the quality of press-fitting, and also improve the safety. Brief Description of the Drawings

[0017] Figure 1 Structural schematic diagram of the present invention;

[0018] Figure 2 3D view of the bearing component in the present invention;

[0019] Figure 3 3D view of the feeding component in the present invention;

[0020] Figure 4 3D view of the press-fitting component in the present invention;

[0021] Figure 5 3D view of the upper part of the rotation detection component in the present invention;

[0022] Figure 6 3D view of the lower part of the rotation detection component in the present invention;

[0023] Figure 7 3D view of the vertical frame connection structure in the present invention.

[0024] In the figure: 1. Stand; 2. Turntable; 3. Loading component; 301. Double platform; 302. Support cylinder; 303. Side block; 304. Sleeve block; 305. Inner block; 306. Linear module; 307. Moving plate; 308. Diagonal bar; 309. Convex block; 310. Platform block; 311. Insert block; 312. Top block; 313. Pusher cylinder; 4. Loading component; 401. Top plate; 402. Lower pushing cylinder; 403. Front pushing cylinder; 404. Pushing plate; 405. Clamping cylinder; 5. Pressing component; 501. Vertical plate; 502. Lifting cylinder; 503. Lifting plate; 504. Fixed plate; 505. Side pushing cylinder; 506. Side pushing plate; 507. Lower pushing block; 508. Detection pressure head; 6. Rotating detection component; 601. Connecting plate; 602. Back pushing cylinder; 603. Back pushing plate; 604. Plate platform; 605. Ejecting cylinder; 606. Ejecting head; 607. Ejecting rod; 608. Bottom plate; 609. Bottom pushing cylinder; 610. T-shaped plate; 611. Double plate; 612. Driving motor; 613. Rotating head; 614. Visual detection device; 8. Positioning cylinder; 9. Vertical stand; 10. Support cylinder; 11. Supporting plate. Detailed implementation

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figure 1 and 7 As shown in the figure, an automatic press-fitting device for an intermediate shell in this embodiment includes a stand 1. The stand 1 is divided into an upper stage and a lower stage. A turntable 2 is installed on the top of the lower stage, and a plurality of vertical stands 9 are installed at the bottom of the turntable 2. A support cylinder 10 is installed on the top of the vertical stand 9, and a supporting plate 11 is fixed on the top of the support cylinder 10. A plurality of loading components 3 are installed on the top of the turntable 2. An upper loading component 4 and a pressing component 5 located above the tabletop of the turntable 2 are installed at the bottom of the upper stage. A plurality of through holes are opened on the tabletop of the turntable 2, and a positioning cylinder 8 that can extend into the through holes is fixed at the bottom.

[0027] In the above structure, the upper loading component can complete the loading of the intermediate shell and the bearing seat successively. First, the intermediate shell is limited by the loading component. Then, the position of the loading component is adjusted by rotating the turntable so that the product to be press-fitted moves along. Until it moves below the pressing component, the positioning cylinder jacks up to limit the turntable. With the cooperation of the vertical stand, the support cylinder and the supporting plate, the tabletop of the turntable is supported, facilitating the pressing operation of the intermediate shell and the bearing by the pressing component.

[0028] As Figure 3 shown in the direction, the loading component 4 includes a top plate 401 fixed to the bottom of the upper table. A lower pushing cylinder 402 is installed on the front surface of the top plate 401. A front pushing cylinder 403 is installed at the ejecting end of the lower pushing cylinder 402. A push plate 404 is fixed at the ejecting end of the front pushing cylinder 403. The push plate 404 is L-shaped. A clamping cylinder 405 is installed at the bottom of the push plate 404. The clamping ends of the clamping cylinder 405 are two L-shaped clamping plates. By driving the clamping cylinder forward through the front pushing cylinder, the clamping cylinder can be moved above the intermediate shell. Then, by ejecting through the lower pushing cylinder, the intermediate shell is positioned between the two pairs of L-shaped clamping plates. By operating the clamping cylinder, the clamping of the intermediate shell is completed. By retracting, the product can be placed on the bearing component, and then the above operations are repeated to load the bearing seat.

[0029] As Figure 2 shown in the direction, the bearing component 3 includes a plurality of double brackets 301 fixed on the table top of the turntable 2. The double brackets 301 are divided into an upper table plate and a lower table plate. A support cylinder 302 is fixed to the top of the lower table plate. Through holes are provided on the upper table plate and are distributed opposite to the support cylinder 302. Edge blocks 303 are fixed to the top of the upper table plate and are distributed oppositely. Sleeve blocks 304 are fixed to one side of the opposite edge blocks 303. The sleeve blocks 304 are hollow inside, and waist holes are provided on both the front and rear sides. An inner block 305 is sleeved inside the sleeve block 304. The tops of the two opposite inner blocks 305 are inclined, and a convex block 309 located in the waist hole is fixed to the back of the inner block 305. A linear module 306 is installed on the back of the upper table plate. A T-shaped moving plate 307 is fixed to the moving end of the linear module 306. Diagonal rods 308 are hinged to the tops of both ends of the moving plate 307. The other end of the diagonal rod 308 is hinged to the convex block 309. First, the loading component clamps and moves the intermediate shell above the corresponding upper table plate, places and supports the intermediate shell through the through hole for limiting and the support cylinder, and then the linear module will push the moving block. Through the linkage of the moving block and the diagonal rod, the inner block is driven to move in the sleeve block through the convex block until one end of the convex block is located above the side of the intermediate shell to realize the function of limiting the intermediate shell.

[0030] Among them, a table block 310 is fixedly installed on the top of the lower platen at the left side of the support cylinder 2. The inner side of the table block 310 is hollowed out, and sockets are provided on the front, rear, top, and left sides of the table block 310. An insertion block 311 is inserted into the front socket, the protruding end of the insertion block 311 is located in the left socket, a top block 312 is inserted into the top socket, and the top block 312 penetrates through the upper platen. A push block cylinder 313 fixedly connected to the protruding end of the insertion block 311 is installed on the left side of the table block 310. The bottom of the top block 312 and the side opposite to the insertion block 311 are both adapted to be inclined. After the middle shell is placed and the inner block limits the position of the middle shell at the same time, the push block cylinder pushes the inner block to move. Through the contact between the inclined surface of the inner block and the inclined surface of the top block, the top block can be jacked up, so that the left inner block and the top block clamp and position the middle shell, improving the stability during press-fitting.

[0031] As Figure 4 As shown in the direction, a vertical plate 501 is fixedly installed at the bottom of the upper stage of the frame 1. A lifting cylinder 502 is installed on the back of the vertical plate 501, and an adjustment hole is provided on the vertical plate 501. The ejecting end of the lifting cylinder 502 is fixedly connected to a lifting plate 503 slidably connected to the vertical plate 501. A lower push block 507 is installed on the lifting plate 503. The connection end between the back of the lifting plate 503 and the back of the lifting cylinder 502 is located in the adjustment hole. A detection press head 508 is installed at the bottom of the lower push block 507, and a pressure plate is fixedly installed at the middle section on the outer side of the detection press head 508. Two buffers and a baffle located between the two buffers are installed on the front of the vertical plate 501 below the lower push block 507. By driving the lower push block to move through the lifting cylinder, the detection press head can be driven to move downward, and the press-fitting operation of the bearing seat can be completed through the pressure plate. During downward pressing, the buffers and the baffle can limit the lower push block to prevent excessive downward pressing, playing a role in limiting the lower push block.

[0032] Among them, a fixing plate 504 is installed on the top of the lifting plate 503. The vertical plate 501 is L-shaped. A side push cylinder 505 is installed on the fixing plate 504. The ejecting end of the side push cylinder 505 is fixedly connected to a side push plate 506. The bottom of the side push plate 506 is fixedly connected to the top of the lower push block 507, and the back of the lower push block 507 is slidably connected to the lifting plate 503. The bottom end of the detection press head 508 is a visual detection sensor head. By pushing the side push plate through the side push cylinder, the lower push block can be driven to move left and right, so as to detect whether the position of the bearing seat placed in the middle shell is neat. After detection, press-fitting can improve the quality of the press-fitting of the bearing seat and the middle shell.

[0033] As Figure 5-6For the shown direction, in order to detect the product after press-fitting, a rotary detection component 6 is installed on the gantry 1. The rotary detection component 6 includes a connecting plate 601 fixed to the bottom of the upper platform of the gantry 1. A back-pushing cylinder 602 is installed on the right side of the connecting plate 601, and a moving hole is formed in the connecting plate 601. The ejecting end of the back-pushing cylinder 602 is fixed with a back-pushing plate 603. The back-pushing plate 603 is slidably connected to the connecting plate 601. A plate platform 604 is fixed to the top of the back-pushing plate 603. An ejecting cylinder 605 is rotatably connected to the upper plate of the plate platform 604. The ejecting end of the ejecting cylinder 605 is fixed with a ejecting rod 607 that passes through the lower plate of the plate platform 604 and the back-pushing plate 603. A limiting disk is fixed to the outer side of the ejecting rod 607. A ejecting head 606 is installed at the bottom of the ejecting rod 607. Two sets of visual detection devices 614 are installed on the top of the back-pushing plate 603 and are distributed opposite to the ejecting head 606. A bottom plate 608 is fixed to the top of the upper platform of the gantry 1. A bottom ejecting cylinder 609 is installed on the bottom plate 608. The ejecting end of the bottom ejecting cylinder 609 is fixed with a T-shaped plate 610 that is slidably connected to the bottom plate 608. A double plate 611 is fixed to the left side of the T-shaped plate 610. A driving motor 12 is installed on the lower plate of the double plate 611. The rotating end of the driving motor 12 is fixed with a rotating head 613 that passes through the upper plate of the double plate 611. The rotating head 613 can extend into the interior of the support cylinder 302 and be in contact with the bottom of the product. A limiting disk is also fixed to the outer side of the rotating head 613. When the press-fitted product moves between the ejecting head and the rotating head, the inner block and the ejecting block are reset. At the same time, the back-pushing cylinder and the bottom ejecting cylinder operate simultaneously. The T-shaped plate and the double plate drive the rotating head to extend into the support cylinder and closely adhere to the bottom of the intermediate shell and lift it to a certain height. The back-pushing plate moves to drive the ejecting head to move down a certain distance. Then, the ejecting cylinder drives the ejecting head to first extend into the inner side of the bearing seat, and then presses the bearing seat through the outer circle. At the same time, the visual detection device is aligned with the press-fitting position. The driving motor operates. Then, under the follow-up of the ejecting cylinder, it can drive the press-fitted product to rotate. Then, the visual detection device detects whether the press-fitting position is qualified to complete the detection operation.

[0034] The working principle of the above embodiment is as follows:

[0035] Through the cooperation of the forward push cylinder and the lower push cylinder, the intermediate housing or the bearing seat is successively located between the clamping ends of the clamping cylinder, and is clamped and transferred to the double bench in sequence and placed thereon, and is supported by the support cylinder. Then, the linear module drives two inclined rods through the moving plate to make the two inner blocks move relatively, so as to limit the intermediate housing. Then, the push block cylinder pushes the insert block to jack up the top block to closely adhere to the bottom of the intermediate housing, and cooperates with the inner block to complete the clamping and positioning of the intermediate housing. Then, the turntable rotates to make the product located under the detection indenter. The side push cylinder drives the lower push block to move left and right, so as to detect whether the position of the detection indenter at the bottom of the bearing seat placed in the intermediate housing is appropriate. After being appropriate, the detection indenter resets. Then, the jacking cylinder drives the detection indenter to extend into the bearing seat and complete the pressing of the product. After the pressing is completed, the inner block and the top block reset, and the product is transferred to under the top head and the rotating head. At this time, the bottom push cylinder jacks up, so that the rotating head extends into the support cylinder and jacks up the product to an appropriate height. Then, the back push cylinder and the ejecting cylinder drive the back push plate and the top head to move downwards, which can press down the product. By running the driving motor and following the ejecting cylinder, the product can be driven to rotate. Through the vision detection device, the qualified detection of the completed pressing of the product can be completed.

[0036] In summary, it can realize the automatic pressing of the product, thereby effectively improving the production efficiency, and can also automatically detect whether the pressing is qualified and the placement is qualified. Therefore, it can improve the production quality, and at the same time can also improve the safety of the workers.

[0037] The entire work process is completed, and the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0038] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a..." does not exclude the existence of other identical elements in the process, method, article or device including the said element.

[0039] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic intermediate shell press-fitting device, characterized in that: It includes a stand (1), a turntable (2) installed on the stand (1), and a support part arranged below the turntable (2). A plurality of bearing components (3) are installed on the turntable (2), and a feeding component (4) and a pressing component (5) are installed on the stand (1). The bearing component (3) includes a double-stage frame (301) fixed on the turntable (2). A support cylinder (302) is fixed on the top of the lower stage of the double-stage frame (301), and two side blocks (303) are fixed on the top of the upper stage and a hole opposite to the support cylinder (302) is provided. On the opposite sides of the two side blocks (303), sleeve blocks (304) are fixed. An inner block (305) is slidably connected to the inside of the sleeve block (304), and a pushing part connected to the two inner blocks (305) is installed on the back of the upper stage.

2. The automatic press-fitting device for an intermediate shell according to claim 1, wherein: The pushing part includes a linear module (306) installed on the back of the upper stage. A moving plate (307) is fixed to the moving end of the linear module (306). Two inclined rods (308) are hinged to the moving plate (307). A convex block (309) passing through the sleeve block (304) is formed on one side of the inner block (305), and the convex block (309) is hinged to one end of the inclined rod (308).

3. An automatic intermediate shell pressing device according to claim 2, characterized in that: A table block (310) is fixed on the top of the lower stage of the double-stage frame (301). An insertion block (311) and a top block (312) are slidably connected inside the table block (310), and the top block (312) is located on the top of the insertion block (311). The opposite sides of the top block (312) and the insertion block (311) are both in a matching inclined shape. A push block cylinder (313) connected to the insertion block (311) is installed on one side of the table block (310).

4. The automatic press-fitting device for an intermediate housing according to claim 1, characterized in that: The feeding component (4) includes a top plate (401) fixed to the bottom of the top stage of the stand (1). A lower pushing cylinder (402) is installed on the top plate (401). A forward pushing cylinder (403) is installed at the ejecting end of the lower pushing cylinder (402). A push plate (404) is fixed to the ejecting end of the forward pushing cylinder (403). A clamping cylinder (405) is installed at the bottom of the push plate (404).

5. An automatic intermediate housing press-fitting device according to claim 1, characterized in that: The pressing component (5) includes a vertical plate (501) fixed to the bottom of the upper stage of the double-stage frame (301). A lifting cylinder (502) is installed on the back of the vertical plate (501). A lifting plate (503) sliding with the vertical plate (501) is fixed to the ejecting end of the lifting cylinder (502). A lower pushing block (507) is fixed to the front of the lifting plate (503). A detection pressing head (508) is installed on the top of the lower pushing block (507).

6. The automatic press-fitting device for an intermediate housing according to claim 5, wherein: A fixing plate (504) is installed on the top of the lifting plate (503). A side pushing cylinder (505) is installed on the fixing plate (504). A side pushing plate (506) connected to the lower pushing block (507) is fixed to the ejecting end of the side pushing cylinder (505). The lower pushing block (507) is slidably connected to the lifting plate (503).

7. An automatic intermediate shell pressing device according to claim 1, characterized in that: A plurality of through holes are formed in the tabletop of the turntable (2), and a positioning cylinder (8) that can extend into the through holes is installed on the lower tabletop of the turntable (2). The supporting part includes a plurality of vertical frames (9) fixed to the top of the lower part of the frame (1). A supporting cylinder (10) is installed on the vertical frame (9), and a supporting plate (11) is fixed to the top of the supporting cylinder (10).

8. An automatic press-fitting device for an intermediate housing according to claim 1, characterized in that: A rotation detection assembly (6) is installed on the frame (1). The rotation detection assembly (6) is divided into a lower top detection group and an upper top rotation group. The lower top detection group is installed at the bottom of the upper part of the frame (1), and the upper top rotation group is installed at the top of the lower part of the frame (1).

9. An automatic intermediate shell pressing device according to claim 8, characterized in that: The lower top detection group includes a connecting plate (601) fixed to the bottom of the upper part of the frame (1). A back-pushing cylinder (602) is installed on the back surface of the connecting plate (601). The ejecting end of the back-pushing cylinder (602) is fixed with a back-pushing plate (603) that slides on the connecting plate (601). A plate platform (604) and two groups of visual detection devices (614) extending downward are fixed to the top of the back-pushing plate (603). A top cylinder (605) is rotatably installed on the top of the plate platform (604). The ejecting end of the top cylinder (605) is fixed with a top rod (607) that passes through the back-pushing plate (603). A top head (606) is installed at the bottom of the top rod (607).

10. An automatic intermediate housing press-fitting device according to claim 9, characterized in that: The upper top rotation group includes a bottom plate (608) fixed to the top of the lower part of the frame (1). A bottom pushing cylinder (609) is installed on the bottom plate (608). The ejecting end of the bottom pushing cylinder (609) is fixed with a T-shaped plate (610) that slides on the bottom plate (608). A double plate (611) is fixed to the T-shaped plate (610). A driving motor (612) is installed on the double plate (611). The rotating end of the driving motor (612) is fixed with a rotating head (613) that can extend into the inside of the support cylinder (302).

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