Straight seam welding device for cylinder machining

Abstract

The straight seam welding device comprises a machining table, an assembling base and blocking frames, the pair of blocking frames are arranged on the machining table in a telescopic movement mode, a machining barrel is installed on the machining table in a telescopic movement mode, and the machining barrel is located in the middle of the pair of blocking frames; a lower bearing module is arranged on the machining table, the lower bearing module comprises a linkage frame, a linkage column, a worm and a worm gear, the linkage frame telescopically moves in the machining table, continuous alveolar groove lines are arranged on one side of the linkage frame, a guide pad is fixedly connected to the end of the linkage frame, and a first elastic part is arranged on one side of the guide pad. According to the straight seam welding device for cylinder machining, the inner bearing module is controlled through the pre-tightening force of the second elastic piece, so that the bearing rollers are radially unfolded along the inner wall of the cylinder to form self-adaptive enveloping bearing, it is guaranteed that the surface of the machining cylinder is in a full state when the machining cylinder is subjected to straight seam welding, and the precision of the machining cylinder is improved when the machining cylinder is subjected to straight seam welding.

Description

Technical Field

[0001] The present invention belongs to the technical field of straight seam welding, and specifically relates to a straight seam welding device for cylinder body processing. Background Art

[0002] When a cylinder body is subjected to straight seam welding, since the cylinder body is hollow, the cylinder body will be deformed when placed on a welding tooling or after being produced and pressed. At this time, there will be a difference in the distance from the surface of the cylinder body to the welding device, thus affecting the welding effect of the cylinder body.

[0003] In view of this, a straight seam welding device for cylinder body processing is proposed. Summary of the Invention

[0004] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title. However, such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the following technical problems in the prior art: When a cylinder body is subjected to straight seam welding, since the cylinder body is hollow, the cylinder body will be deformed when placed on a welding tooling or after being produced and pressed. At this time, there will be a difference in the distance from the surface of the cylinder body to the welding device, thus affecting the welding effect of the cylinder body.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: A straight seam welding device for cylinder body processing, including a processing table, an assembly seat, and a retaining frame. A pair of retaining frames are telescopically moved on the processing table, and a processing cylinder is telescopically and movably installed on the processing table, and the processing cylinder is located at the middle position between the pair of retaining frames;

[0007] The processing table is configured with a lower bearing module, and the lower bearing module includes a linkage frame, a linkage column, a worm, and a worm gear. The linkage frame is telescopically moved in the processing table. A continuous tooth groove pattern is arranged on one side of the linkage frame. A guide pad is fixedly connected to the end of the linkage frame, and an elastic member I is arranged on one side of the guide pad;

[0008] An inner bearing module is arranged on the retaining frame. The inner bearing module includes a bearing cylinder, a guide cylinder, a bearing arm I, and a fixed cylinder. The bearing cylinder is fixedly connected to the side of the retaining frame facing the processing cylinder. An extension cylinder is fixedly connected to the part of the bearing cylinder facing the processing cylinder. The guide cylinder is telescopically moved in the bearing cylinder and the extension cylinder;

[0009] An adjustment module is arranged on the retaining frame. A motor II is arranged on the back of the retaining frame. The movable part of the motor II is connected to a lead screw II. A cylinder is arranged on the side of the extension cylinder facing the processing cylinder.

[0010] As a preferred technical solution of a straight-seam welding device for cylinder processing, an H-shaped frame is installed on the processing table, an assembly seat is installed on the H-shaped frame, and a welding gun moves telescopically on the assembly seat.

[0011] As a preferred technical solution of a straight-seam welding device for cylinder processing, the linkage column is hinged to the processing table, the outer contour of the upper section of the linkage column is provided with equally angled tooth groove patterns, the worm is hinged to the processing table, and the lower position of the linkage column and the lower position of the worm are linked by a conveyor belt.

[0012] As a preferred technical solution of a straight-seam welding device for cylinder processing, a worm gear is externally engaged with the upper position of the worm, the worm gear is hinged to the processing table, irregular wheels are installed at two extreme positions of the worm gear, and the irregular wheels are hinged to the processing table.

[0013] As a preferred technical solution of a straight-seam welding device for cylinder processing, a displacement module is installed at the center line position of the processing table. The displacement module includes a motor 1 and a bidirectional lead screw. The motor 1 is fixedly connected to one side of the processing table, the input part of the bidirectional lead screw is butted against the output part of the motor 1, and the bidirectional lead screw is hinged to the processing table.

[0014] As a preferred technical solution of a straight-seam welding device for cylinder processing, a retaining frame is threadedly connected to the bidirectional lead screw. Three protrusions are installed below the retaining frame. An internal thread groove channel is milled on the protrusion at the central position, and the protrusions on both sides are connected to an elastic member 1.

[0015] As a preferred technical solution of a straight-seam welding device for cylinder processing, a number of load-bearing arms 1 are equally angled and hinged to the outer contour of the part where the guiding cylinder extends out of the bearing cylinder. A load-bearing roller is hinged to the load-bearing arm 1.

[0016] As a preferred technical solution of a straight-seam welding device for cylinder processing, a movable cylinder moves telescopically on the circumferential surface of the guiding cylinder. A fixed cylinder is fixedly connected to the circumferential surface of the movable cylinder. A load-bearing arm 2 is fixedly connected to the fixed cylinder. The part of the load-bearing arm 2 deviating from the fixed cylinder is movably butted against the load-bearing arm 1. An elastic member 2 is installed at the middle position between the fixed cylinder and the guiding cylinder.

[0017] As a preferred technical solution of a straight-seam welding device for cylinder processing, an irregular column is threadedly connected to the lead screw 2. The irregular column is in spline fit with the guiding cylinder. An expansion disk is installed at the part where the irregular column extends into the guiding cylinder. A notch is milled on the guiding cylinder.

[0018] As a preferred technical solution of a straight seam welding device for cylinder processing, the adjustment module includes a barbed hook frame, an I-shaped column, an elastic member III, and a notch. The barbed hook frame is hinged in the recess of the guide cylinder. The I-shaped column moves telescopically in the recess of the guide cylinder. An elastic member III is wound around the outer periphery of the part of the I-shaped column extending into the middle of the guide cylinder. The notch is milled on the inner edge of the bearing cylinder. The barbed hook frame is fitted with the notch.

[0019] Advantages of the present invention:

[0020] 1. The straight seam welding device for cylinder processing relies on the internal bearing module to be controlled by the pre-tightening force of the elastic member II, so that the bearing rollers are radially unfolded along the inner wall of the cylinder to form an adaptive envelope bearing, thereby ensuring that the surface of the processing cylinder is in a plump state during straight seam welding. And a pair of retaining frames move synchronously, which can center the processing cylinder, so as to improve the accuracy of the processing cylinder during straight seam welding.

[0021] 2. The straight seam welding device for cylinder processing relies on the adjustment module to adopt the mechanical interlock design of the barbed hook frame and the notch, so that the first bearing arm and the bearing rollers can be further adjusted after being in the position of the processing cylinder, ensuring the best state contact between the first bearing arm and the bearing rollers and the processing cylinder, and can adjust the processing cylinder with a sunken position to a certain extent, so that the best welding effect can be obtained at the straight seam of the processing cylinder.

[0022] 3. The straight seam welding device for cylinder processing relies on the lower bearing module based on the linkage of the bidirectional lead screw and the worm and worm gear. Through the deformation feedback of the elastic member I, it drives the irregular wheel to perform dynamic lifting and positioning on the processing cylinder, so that the axis of the cylinder automatically coincides with the center of the retaining frame, ensuring the accuracy of the processing cylinder during welding, and facilitating the loading and unloading operation of the processing cylinder.

[0023] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained through the structures specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them:

[0025] Figure 1 is the overall structural schematic diagram of the present invention.

[0026] Figure 2 is based on the present inventionFigure 1 Schematic plan view.

[0027] Figure 3 Based on the present invention Figure 1 Schematic view after the processing cylinder is hidden.

[0028] Figure 4 Based on the present invention Figure 3 Schematic sectional view.

[0029] Figure 5 Based on the present invention Figure 4 Enlarged schematic view of X in

[0030] Figure 6 Schematic structural view of the guiding cylinder of the present invention.

[0031] Figure 7 Exploded schematic view of the retaining frame of the present invention.

[0032] Figure 8 Schematic sectional view of the retaining frame of the present invention.

[0033] Figure 9 Schematic structural view of the processing table of the present invention.

[0034] Figure 10 Based on the present invention Figure 9 Enlarged schematic view of Y in

[0035] Reference numerals:

[0036] 100, processing cylinder; 101, assembly seat; 102, welding gun; 200, processing table; 201, displacement module; 202, motor 1; 203, bidirectional lead screw; 204, lower bearing module; 205, elastic member 1; 206, guiding pad; 207, linkage frame; 208, linkage column; 209, worm; 210, conveyor belt; 211, worm gear; 212, irregular wheel; 300, retaining frame; 301, inner bearing module; 302, bearing cylinder; 303, extension cylinder; 304, guiding cylinder; 305, bearing arm 1; 306, bearing roller; 307, movable cylinder; 308, fixed cylinder; 309, bearing arm 2; 310, elastic member 2; 311, adjustment module; 312, motor 2; 313, lead screw 2; 314, cylinder; 315, irregular column; 316, barb frame; 317, I-shaped column; 318, elastic member 3; 319, notch. Detailed implementation manners

[0037] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given with reference to the accompanying drawings of the specification.

[0038] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, the present invention may be practiced in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0039] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or selectively exclusive embodiments from other embodiments.

[0040] Thirdly, the present invention is described in detail in conjunction with schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally in a non-general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0041] Embodiment, referring to Figure 1 and 2 , a straight seam welding device for cylinder body processing, including a processing table 200, an assembly seat 101, and a stop frame 300. An H-shaped frame is installed on the processing table 200, and the assembly seat 101 is installed on the H-shaped frame in a telescopic movement manner. Among them, the assembly seat 101 is driven by an X-axis movement mechanism on the H-shaped frame, and the X-axis movement mechanism can be commonly purchased on the market. A pair of stop frames 300 are telescopically moved on the processing table 200, and a processing cylinder 100 is installed on the processing table 200, and the processing cylinder 100 is located at the middle position between the pair of stop frames 300;

[0042] A welding gun 102 is telescopically moved on the assembly seat 101, and the welding gun 102 is used for straight seam welding;

[0043] Referring to Figure 7 , 910, a lower bearing module 204 is arranged on the processing table 200, and the lower bearing module 204 includes a linkage frame 207, a linkage column 208, a worm 209 and a worm wheel 211, the linkage frame 207 telescopically moves in the processing table 200, one side of the linkage frame 207 is provided with a continuous alveolar pattern, the end of the linkage frame 207 is fixedly connected with a guide pad 206, one side of the guide pad 206 is provided with an elastic member 205, the linkage column 208 is hinged in the processing table 200, and the outer contour of the upper part of the linkage column 208 is provided with an equal angle alveolar pattern The worm 209 is hinged in the processing table 200, and the lower section of the linkage column 208 and the lower section of the worm 209 are linked by the conveyor belt 210, wherein the lower section of the linkage column 208 and the lower section of the worm 209 are both provided with pulleys to ensure that the conveyor belt 210 can smoothly link the two, and the upper section of the worm 209 is externally engaged with a worm wheel 211, which is hinged in the processing table 200, and irregular wheels 212 are installed at the two extreme positions of the worm wheel 211, and the irregular wheel 212 is hinged on the processing table 200;

[0044] Reference Figure 4 , 8 9, a displacement module 201 is installed at the center line position of the processing table 200, and the displacement module 201 includes a motor 202 and a bidirectional lead screw 203. The motor 202 is fixedly connected to one side of the processing table 200, and the input part of the bidirectional lead screw 203 is connected to the output part of the motor 202. The bidirectional lead screw 203 is hinged on the processing table 200, and the bidirectional lead screw 203 is externally threaded with a retaining frame 300. Three protrusions are installed below the retaining frame 300. The protrusion at the center position is milled with an inner thread pattern channel for threaded transmission with the bidirectional lead screw 203, and the protrusions on both sides are connected with the elastic member 205;

[0045] Through the above, the following can be achieved: control the first motor 202 so that the bidirectional lead screw 203 can drive a pair of retaining frames 300 to move away from each other under the action of the screw connection. The space between the pair of retaining frames 300 expands. The retaining frames 300 no longer act on the first elastic member 205 due to the protrusions on both sides, and the first elastic member 205 expands. When reaching the appropriate position, the guiding pad 206 also moves towards the protruding directions on both sides of the retaining frame 300. The linkage frame 207 moves together with the guiding pad 206. The linkage frame 207 drives the linkage column 208 to perform a revolving motion under the action of engagement. The linkage column 208 drives the worm 209 to perform a revolving operation relying on the conveyor belt 210. The worm 209 drives the worm gear 211, and the worm gear 211 drives the irregular wheel 212 to turn. At this time, the processing cylinder 100 is placed on the processing table 200. Thereafter, the first motor 202 is operated to make the bidirectional lead screw 203 drive a pair of retaining frames 300 to move towards each other. During this process, the retaining frames 300 press on the first elastic member 205. Subsequently, the guiding pad 206 acts to move towards the central position of the processing table 200. Under the action of the linkage frame 207, the linkage column 208, the conveyor belt 210, the worm 209, and the worm gear 211, the irregular wheel 212 can be turned over. The irregular wheel 212 can jack up the processing cylinder 100 towards the upper position, can carry the processing cylinder 100, so that the center of the processing cylinder 100 can coincide with the center of the retaining frame 300, improving the welding accuracy. With the gradual movement of the retaining frame 300, relying on the worm gear 211 and the worm 209, it can prevent the irregular wheel 212 from loosening due to the automatic action of the processing cylinder 100, improving the load-bearing stability of the irregular wheel 212 for the processing cylinder 100.

[0046] Referring to Figure 3 、 4 Figures 6, 7, and 8, an inner load-bearing module 301 is installed on the retaining frame 300. The inner load-bearing module 301 includes a load-bearing cylinder 302, a guiding cylinder 304, a first load-bearing arm 305, and a fixed cylinder 308. The load-bearing cylinder 302 is fixedly connected to the side of the retaining frame 300 facing the processing cylinder 100. An extension cylinder 303 is fixedly connected to the part of the load-bearing cylinder 302 facing the processing cylinder 100. The guiding cylinder 304 performs telescopic movement in the load-bearing cylinder 302 and the extension cylinder 303. The outer contour of the part of the guiding cylinder 304 extending out of the load-bearing cylinder 302 is hinged with a plurality of first load-bearing arms 305 at equal angles. A load-bearing roller 306 is hinged on the first load-bearing arm 305. A movable cylinder 307 performs telescopic movement on the circumferential surface of the guiding cylinder 304. A fixed cylinder 308 is fixedly connected to the circumferential surface of the movable cylinder 307. A second load-bearing arm 309 is fixedly connected to the fixed cylinder 308. The part of the second load-bearing arm 309 deviating from the fixed cylinder 308 is movably butted on the first load-bearing arm 305. An elastic member 310 is installed at the middle position between the fixed cylinder 308 and the guiding cylinder 304;

[0047] Through the above, the following can be achieved: when the blocking frame 300 moves towards the processing cylinder 100, the bearing cylinder 302 and the extension cylinder 303 move synchronously with the blocking frame 300 at this moment. When the guiding cylinder 304 is driven by the extension cylinder 303 to extend into the processing cylinder 100, the first bearing arm 305 and the bearing roller 306 will flip under the action of the opening position of the processing cylinder 100. As the guiding cylinder 304 continuously extends, the bearing roller 306 corresponds to the inner edge of the processing cylinder 100. During the flipping process of the first bearing arm 305, the second bearing arm 309 will drive the movable cylinder 307 to perform telescopic movement on the guiding cylinder 304. At this moment, the second elastic member 310 undergoes a deformation of unfolding. When the bearing roller 306 moves in the processing cylinder 100, it can carry different parts of the processing cylinder 100, improving the precision effect during the longitudinal seam welding of the processing cylinder 100.

[0048] Referring to Figure 4 、 5 、6, 7 and 8, an adjustment module 311 is installed on the blocking frame 300. The adjustment module 311 includes a barb frame 316, an I-shaped column 317, a third elastic member 318 and a notch 319. A second motor 312 is installed on the back of the blocking frame 300. The movable part of the second motor 312 is connected to a second lead screw 313. A cylinder 314 is installed on the side of the extension cylinder 303 facing the processing cylinder 100. An irregular column 315 is threadedly connected to the second lead screw 313. The irregular column 315 is in spline fit with the guiding cylinder 304, and an extension disc is installed at the part of the irregular column 315 extending into the guiding cylinder 304. A notch is milled on the guiding cylinder 304. The barb frame 316 is hinged in the notch of the guiding cylinder 304. The I-shaped column 317 performs telescopic movement in the notch of the guiding cylinder 304. The third elastic member 318 is wound around the outer periphery of the part of the I-shaped column 317 extending into the middle of the guiding cylinder 304. The notch 319 is milled on the inner edge of the bearing cylinder 302. The barb frame 316 is engaged with the notch 319;

[0049] The above can be achieved as follows: When the blocking frame 300 moves telescopically, the inner bearing module 301 extends into the processing cylinder 100. When the processing cylinder 100 touches the blocking frame 300, a pair of blocking frames 300 limit the processing cylinder 100 to ensure that the position of the processing cylinder 100 can be centered and determined. Then, the second motor 312 can be controlled and operated. Under the action of screw connection, the second lead screw 313 will drive the irregular column 315 to move telescopically in the guiding cylinder 304. During this process, the irregular column 315 moves towards the position of the blocking frame 300. The expansion disc of the irregular column 315 directly acts on the I-shaped column 317, causing the third elastic member 318 to deform. The I-shaped column 317 drives the barb frame 316 to flip, so that the barb frame 316 disengages from the notch 319. At this time, there is no restrictive effect between the bearing cylinder 302 and the guiding cylinder 304. Subsequently, the continuous movement of the irregular column 315 will drive the guiding cylinder 304 together. When the guiding cylinder 304 moves to a suitable position and the cylinder 314 touches the fixed cylinder 308, during the movement of the guiding cylinder 304, relying on the second bearing arm 309 and the second elastic member 310, the first bearing arm 305 can be driven to expand appropriately, so that the bearing roller 306 touches the inner edge of the processing cylinder 100 with a better effect, adjusting and shaping the processing cylinder 100 to a full state, and ensuring the best effect during the straight seam welding of the processing cylinder 100.

[0050] It should be understood that in the development process of any actual implementation, in any engineering or design project, a large number of specific implementation decisions can be made. Such development efforts may be complex and time-consuming, but for those ordinary technical personnel who benefit from this disclosure, without excessive experimentation, the development efforts will be a routine task of design, manufacturing, and production.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A straight seam welding device for cylinder body processing, characterized in that: It includes a processing table, an assembly seat and a retaining frame. A pair of retaining frames are telescopically moved on the processing table. A processing cylinder is telescopically installed on the processing table, and the processing cylinder is located at the middle position between the pair of retaining frames; A lower bearing module is arranged on the processing table. The lower bearing module includes a linkage frame, a linkage column, a worm and a worm gear. The linkage frame is telescopically moved in the processing table. A continuous alveolar texture is arranged on one side of the linkage frame. A guiding pad is fixedly connected to the end of the linkage frame. An elastic member I is arranged on one side of the guiding pad; An inner bearing module is arranged on the retaining frame. The inner bearing module includes a bearing cylinder, a guiding cylinder, a bearing arm I and a fixed cylinder. The bearing cylinder is fixedly connected to the side of the retaining frame facing the processing cylinder. An extension cylinder is fixedly connected to the part of the bearing cylinder facing the processing cylinder. The guiding cylinder is telescopically moved in the bearing cylinder and the extension cylinder; An adjustment module is arranged on the retaining frame. A motor II is arranged on the back of the retaining frame. The movable part of the motor II is butted with a lead screw II. A cylinder is arranged on the side of the extension cylinder facing the processing cylinder.

2. The straight seam welding device for cylinder body processing according to claim 1, characterized in that: An H-shaped frame is arranged on the processing table. An assembly seat is arranged on the H-shaped frame. A welding gun is telescopically moved on the assembly seat.

3. The straight seam welding device for cylinder processing according to claim 1, characterized in that: The linkage column is hinged in the processing table. An alveolar texture with equal included angles is arranged on the outer contour of the upper part of the linkage column. The worm is hinged in the processing table. The lower part of the linkage column and the lower part of the worm are linked by a conveyor belt.

4. The straight seam welding device for cylinder body processing according to claim 1, characterized in that: The upper part of the worm is externally meshed with a worm gear. The worm gear is hinged in the processing table. Irregular wheels are arranged at both extreme positions of the worm gear. The irregular wheels are hinged on the processing table.

5. The straight seam welding device for cylinder body processing according to claim 1, characterized in that: A displacement module is arranged at the center line position of the processing table. The displacement module includes a motor I and a bidirectional lead screw. The motor I is fixedly connected to one side of the processing table. The input part of the bidirectional lead screw is butted with the output part of the motor I. The bidirectional lead screw is hinged on the processing table.

6. The straight seam welding device for cylinder body processing according to claim 5, wherein: The bidirectional lead screw is externally threaded with a retaining frame. Three protrusions are arranged below the retaining frame. An internal thread texture channel is milled on the protrusion at the center position. The protrusions on both sides are connected with the elastic member I.

7. The straight seam welding device for cylinder processing according to claim 1, characterized in that: A number of bearing arms I are equally-angularly hinged on the outer contour of the part where the guiding cylinder extends out of the bearing cylinder. A bearing roller is hinged on the bearing arm I.

8. The straight seam welding device for cylinder processing according to claim 1, characterized in that: A movable cylinder is telescopically moved on the circumferential surface of the guiding cylinder. A fixed cylinder is fixedly connected to the circumferential surface of the movable cylinder. A bearing arm II is fixedly connected to the fixed cylinder. The part of the bearing arm II deviating from the fixed cylinder is movably butted on the bearing arm I. An elastic member II is arranged at the middle position between the fixed cylinder and the guiding cylinder.

9. The straight seam welding device for cylinder body processing according to claim 1, characterized in that: An irregular column is threaded on the lead screw II. The irregular column is spline-fitted in the guiding cylinder. An expansion disk is arranged at the part where the irregular column extends into the guiding cylinder. A notch is milled on the guiding cylinder.

10. The straight seam welding device for cylinder processing according to claim 1, characterized in that: The adjustment module includes a barb frame, a shaped column, an elastic member III and a notch. The barb frame is hinged in the notch of the guiding cylinder. The shaped column is telescopically moved in the notch of the guiding cylinder. An elastic member III is wound around the outer circumference of the part where the shaped column extends into the middle of the guiding cylinder. The notch is milled on the inner edge of the bearing cylinder. The barb frame is fitted with the notch.

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