Full-automatic saw chain production equipment

Abstract

The invention relates to the technical field of saw chain production, and discloses full-automatic saw chain production equipment which comprises a main body, a conveyor is fixedly connected to the left side of the main body, and a driver is fixedly connected to the back face of the conveyor. According to the die plate, through outward supporting of the holes in the steel belt and pressure from top to bottom, the situation that when the die plate conducts blanking on the steel belt, due to the fact that large extrusion and shearing force are generated on the steel belt, the holes in the chain piece are twisted and deformed under the action of large extrusion acting force can be reduced, and the integrity of the chain piece during blanking is improved; and meanwhile, the accuracy during subsequent saw chain production and assembly and the production efficiency during production can be further improved.

Description

Technical Field

[0001] This invention relates to the field of saw chain production technology, specifically to a fully automatic saw chain production equipment. Background Technology

[0002] A chainsaw, also known as a chainsaw, is a hand-held saw powered by a gasoline engine. It is mainly used for logging and timber processing. Its working principle is to perform cutting action by moving the L-shaped blades on the saw chain laterally. Saw chain production requires punching steel strips into chain links, followed by heat treatment and assembly to complete the saw chain production. Generally, chain links are produced by first machining uniformly spaced round holes in the steel strip, then punching them again using a stamping die to take appropriate dimensions around the round holes. After heat treatment and assembly, the chain links are produced. When stamping the steel plate around the round holes, the stamping die generates significant extrusion and shearing forces on the surface of the steel strip around the round holes. This can easily cause the round holes on the chain links to twist or deform under the action of large extrusion and shearing forces, affecting the accuracy of subsequent assembly and production efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a fully automated saw chain production equipment to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a fully automatic saw chain production equipment, comprising a main body, a conveyor fixedly connected to the left side of the main body, a driver fixedly connected to the back of the conveyor, and further comprising: The fixing mechanism is installed on the side wall of the main body to prevent the chain from deforming during the punching process when the steel strip is punched into chain links. The auxiliary mechanism is installed at the bottom of the fixed mechanism to ensure the stable reset of the fixed mechanism and the centering of the auxiliary mechanism during punching when the fixed mechanism is working.

[0005] Furthermore, the main body includes: The drive component is installed on the side wall of the main body; The blanking assembly is mounted at the bottom of the drive assembly.

[0006] Furthermore, the fixing mechanism includes several fixing brackets disposed at the bottom of the punching assembly, and the fixing mechanism also includes: The limiting component is installed at the bottom of the mounting bracket; The sliding component is mounted on the side wall of the fixed frame.

[0007] Furthermore, the auxiliary mechanism includes a limiting shaft disposed at the bottom of the fixed frame, and the auxiliary mechanism also includes: Deformation component, which is installed at the bottom of the fixed frame.

[0008] Furthermore, the driving component includes a punching shaft rotatably connected to the inner wall of the top of the main body, a lower template is provided at the bottom of the punching shaft, the bottom of the lower template is fixedly connected to the inner wall of the bottom of the main body, and a number of round holes are provided at the top of the lower template. The outer surface of the punching shaft is connected to the output end of the driver via a belt.

[0009] Furthermore, the blanking assembly includes an upper die plate fixedly connected to the bottom of the blanking shaft, and several pattern plates are fixedly connected to the bottom of the upper die plate; Two round holes are made at the bottom of the upper template inside the model plate.

[0010] Furthermore, the fixing bracket is fixedly connected inside the circular hole; The limiting component includes a tapered shaft fixedly connected to the bottom of the mounting bracket, and the side wall of the tapered shaft has a sliding groove; A spring plate is provided on the outer surface of the tapered shaft, and the top of the spring plate is fixedly connected to the bottom of the fixing frame.

[0011] Furthermore, the sliding assembly includes two trapezoidal blocks slidably connected to the outer surface of the tapered shaft, and right-angle plates are fixedly connected to the side walls of the two trapezoidal blocks; Two trapezoidal blocks are fixedly connected to an L-plate on the side away from the right-angle plate. A return spring is fixedly connected to the side wall of the L-plate, and the end of the return spring away from the L-plate is fixedly connected to the top of the fixing frame.

[0012] Furthermore, the limiting shaft is slidably connected inside the sliding groove; The deformation assembly includes a fixing ring fixedly connected to the side wall of the limiting shaft, and a protruding plate is fixedly connected to the outer wall of the fixing ring near the right angle plate; Several elastic plates are fixedly connected to the bottom of the fixing ring; The sidewalls of the elastic plate are wavy.

[0013] Furthermore, a protrusion is fixedly connected to the outer wall of the elastic plate near the limiting shaft, and a torsion spring is slidably connected between several protrusions; The end of the torsion spring is fixedly connected to one of the protrusions.

[0014] The present invention has the following beneficial effects: This invention reduces the distortion and deformation of the holes in the chain links caused by the large extrusion and shearing forces on the steel strip during punching by the template plate. This improves the integrity of the chain links during punching and also further enhances the accuracy and production efficiency of the subsequent saw chain production and assembly.

[0015] This invention uses multiple protrusions to forcefully and uniformly expand multiple elastic plates, thereby ensuring that when the multiple elastic plates expand outward under downward pressure, the uneven expansion caused by friction or uneven downward pressure will not occur. By ensuring the synchronous outward expansion of multiple elastic plates, the uneven support force on the hole walls of the steel strip caused by uneven expansion of multiple elastic plates can be reduced, which would result in the holes exhibiting elliptical or irregular shapes under load. This further enhances the support strength and uniformity of the holes in the steel strip, and further improves the punching and production efficiency of the chain links during saw chain production.

[0016] This invention, through the deflection of the fixed ring driven by multiple elastic plates, ensures that the chain links after subsequent punching can be precisely separated from the elastic plates when pushed. This reduces the situation where the elastic plates are not separated from the holes of the chain links in time, thus preventing the chain links from sliding and causing chain link residue. In turn, it ensures the cleanliness of the bottom of the mold plate during subsequent steel strip conveying and punching, further improving the continuity and efficiency of chain link production, and further increasing the production intensity of saw chain production.

[0017] The torsional contraction potential energy of the torsion spring of this invention can drive the elastic plates to contract synchronously through the protrusions on multiple elastic plates, thereby ensuring the consistency of the multiple elastic plates when they contract and reset. This reduces the situation where the multiple elastic plates cannot fully retract and reset due to excessive stress concentration when they expand outward over a long period of time. At the same time, the contraction of multiple torsion springs can ensure both the consistency of the contraction of multiple elastic plates and the initial alignment after the multiple elastic plates have contracted and reset, thereby improving the controllability of the expansion and contraction of multiple elastic plates and improving the production efficiency of the saw chain.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall partial cross-sectional structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is a bottom view of the punching assembly of the present invention; Figure 5 This is a schematic diagram of the fixing mechanism of the present invention; Figure 6 This is a schematic diagram of a partial cross-sectional structure of the limiting component of the present invention; Figure 7 This is a partial cross-sectional schematic diagram of the deformation component of the present invention; Figure 8 This is a bottom view of the sliding component structure of the present invention; Figure 9 This is a schematic cross-sectional view of the auxiliary mechanism half of the present invention.

[0021] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Main body; 101. Conveyor; 102. Driver; 11. Drive assembly; 111. Punching shaft; 112. Lower die; 12. Punching assembly; 121. Upper die; 122. Model plate; 123. Circular hole; 2. Fixing mechanism; 201. Fixing frame; 21. Restriction assembly; 211. Tapered shaft; 212. Spring plate; 22. Sliding assembly; 221. Trapezoidal block; 222. Right angle plate; 3. Auxiliary mechanism; 301. Limiting shaft; 31. Deformation assembly; 311. Fixing ring; 312. Elastic plate; 313. Protrusion block; 314. Torsion spring. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1 - Figure 9 As shown, the present invention is a fully automatic saw chain production equipment, including a main body 1, a conveyor 101 fixedly connected to the left side of the main body 1, a driver 102 fixedly connected to the back of the conveyor 101, and also including a fixing mechanism 2 and an auxiliary mechanism 3.

[0024] The fixing mechanism 2 is installed on the side wall of the main body 1 to prevent the chain from deforming during the punching process when the steel strip is punched into chain pieces.

[0025] The auxiliary mechanism 3 is installed at the bottom of the fixed mechanism 2 to ensure the stable reset of the fixed mechanism 2 and the centering of the auxiliary mechanism 3 during punching when the fixed mechanism 2 is working.

[0026] Entity 1 includes: Drive component 11 is installed on the side wall of the main body 1; The blanking assembly 12 is mounted at the bottom of the drive assembly 11.

[0027] The fixing mechanism 2 includes several fixing brackets 201 disposed at the bottom of the punching assembly 12, and the fixing mechanism 2 also includes: Restriction component 21 is installed at the bottom of the fixing frame 201; Sliding component 22 is installed on the side wall of the fixed frame 201.

[0028] The auxiliary mechanism 3 includes a limiting shaft 301 disposed at the bottom of the fixed frame 201, and the auxiliary mechanism 3 also includes: Deformation component 31 is installed at the bottom of the fixing frame 201.

[0029] The drive assembly 11 includes a punching shaft 111 rotatably connected to the inner wall of the top of the main body 1. A lower template 112 is provided at the bottom of the punching shaft 111. The bottom of the lower template 112 is fixedly connected to the inner wall of the bottom of the main body 1. Several round holes are provided at the top of the lower template 112.

[0030] The outer surface of the punching shaft 111 is connected to the output end of the driver 102 via a belt. When the drive motor is working, the driver 102 will drive the punching shaft 111 to slide up and down via the belt. Then, the worker will place the steel strip to be punched into the conveyor 101. At this time, the operation of the conveyor 101 will drive the steel strip to move.

[0031] The blanking assembly 12 includes an upper template 121 fixedly connected to the bottom of the blanking shaft 111, and several model plates 122 are fixedly connected to the bottom of the upper template 121.

[0032] Two round holes 123 are opened at the bottom of the upper template 121 inside the model plate 122. When the steel strip moves, it will slide between the lower template 112 and the upper template 121. At the same time, when the punching shaft 111 drives the upper template 121 to slide up and down, the movement of the upper template 121 will punch the steel strip back and forth through the model plate 122.

[0033] The fixing frame 201 is fixedly connected to the inside of the circular hole 123; the limiting component 21 includes a tapered shaft 211 fixedly connected to the bottom of the fixing frame 201, and the side wall of the tapered shaft 211 is provided with a sliding groove. A spring plate 212 is provided on the outer surface of the tapered shaft 211. The top of the spring plate 212 is fixedly connected to the bottom of the fixed frame 201. When the fixed ring 311 slides upward, it will press the inclined surface of the right angle plate 222 through the protrusion plate. At this time, the right angle plate 222 will drive the two trapezoidal blocks 221 and the L plate to slide under the pressure of the protrusion plate and compress the return spring.

[0034] The sliding assembly 22 includes two trapezoidal blocks 221 that are slidably connected to the outer surface of the tapered shaft 211, and right-angle plates 222 are fixedly connected to the side walls of the two trapezoidal blocks 221.

[0035] Two trapezoidal blocks 221 are fixedly connected to an L-plate on the side away from the right-angle plate 222. A return spring is fixedly connected to the side wall of the L-plate. The end of the return spring away from the L-plate is fixedly connected to the top of the fixing frame 201.

[0036] The limiting shaft 301 is slidably connected inside the sliding groove; the deformation component 31 includes a fixing ring 311 fixedly connected to the side wall of the limiting shaft 301, and a protruding plate is fixedly connected to the outer wall of the fixing ring 311 near the right angle plate 222.

[0037] The bottom of the fixed ring 311 is fixedly connected to several elastic plates 312; the sidewalls of the elastic plates 312 are wavy. When the protrusions 313 on the multiple elastic plates 312 are squeezed by the conical shaft 211, the conical shaft 211 forces and evenly expands the multiple elastic plates 312 through the multiple protrusions 313. This ensures that when the multiple elastic plates 312 expand outward under the action of downward pressure, the expansion of the multiple elastic plates 312 is asynchronous and uneven due to friction or uneven downward pressure.

[0038] A protrusion 313 is fixedly connected to the outer wall of the elastic plate 312 near the limiting shaft 301, and a torsion spring 314 is slidably connected between several protrusions 313; wherein, the end of the torsion spring 314 is fixedly connected to one of the protrusions 313, and when the tapered shaft 211 presses against the multiple protrusions 313, the tapered tip of the tapered shaft 211 will insert into the middle region of the torsion spring 314 and generate an elastic expansion of the torsion spring 314 from the middle outward.

[0039] In use, first connect the output end of the driver 102 to the external drive motor, then start the drive motor. When the drive motor is working, it will drive the conveyor 101 to rotate. At the same time, when the drive motor is working, the driver 102 will drive the punching shaft 111 to slide up and down via the belt. Then, the operator puts the steel strip to be punched into the conveyor 101. At this time, the operation of the conveyor 101 will drive the steel strip to move. When the steel strip moves, it will slide between the lower template 112 and the upper template 121. At the same time, when the punching shaft 111 drives the upper template 121 to slide up and down, the movement of the upper template 121 will punch the steel strip back and forth through the mold plate 122. When the mold plate 122 punches the steel strip, it will punch the surface of the holes on the steel strip into the shape of the chain links on the saw chain. Afterwards, the chain links will fall into the collection equipment during the subsequent steel strip conveying, and the operator will perform heat treatment and assembly work on the chain links, thereby completing the production purpose of the saw chain.

[0040] When the upper template 121 moves downward, punching the steel strip through the mold plate 122 and turning it into chain links under the shearing force of the mold plate 122, the fixing frame 201 will drive multiple elastic plates 312 to move downward synchronously. As the multiple elastic plates 312 move downward, they will align with the holes on the steel strip. Simultaneously, as the upper template 121 slides downward, the multiple elastic plates 312 will insert themselves into the round holes on the steel strip before the mold plate 122 contacts the steel strip, thus aligning with the round holes on the mold plate 122. The bottom inner wall makes contact. Since the bottom of the elastic plate 312 is rolled outward, when the upper template 121 continues to move down through the model plate 122 to punch the steel strip, several elastic plates 312 will cause the fixing ring 311 to slide upward through the limiting shaft 301 in the sliding groove of the tapered shaft 211 as the upper template 121 slides down. When the fixing ring 311 slides upward, it will press the inclined surface of the right angle plate 222 through the protrusion plate. At this time, the right angle plate 222 will drive the two trapezoidal blocks 221 and under the pressure of the protrusion plate. As the L-plate slides and compresses the return spring, the trapezoidal block 221 slides to the top of the fixing ring 311. Then, as the upper mold plate 121 continues to move downwards, the downward sliding of the fixing ring 311 exerts downward pressure on the multiple elastic plates 312. At this time, the multiple elastic plates 312 expand outwards within the holes in the steel strip. When the multiple elastic plates 312 expand outwards within the holes of the steel strip, they generate an outward radial support force within the holes. Then, as the upper mold plate 121 continues to slide downwards, the upper mold... The downward movement of plate 121 also presses the steel strip sidewall around the hole through the elastic pushing action of spring plate 212. By supporting the steel strip from the inside out and applying pressure from top to bottom, the distortion and deformation of the hole on the chain link caused by the large extrusion and shearing force on the steel strip during punching by the mold plate 122 can be reduced. This improves the integrity of the chain link during punching and further enhances the accuracy and production efficiency during subsequent saw chain production and assembly.

[0041] When multiple elastic plates 312 slide downward on the upper template 121 and drive the fixing ring 311 to slide upward on the surface of the tapered shaft 211, the upward sliding of the elastic plates 312 will drive the protrusions 313 and the torsion spring 314 to slide upward synchronously. At this time, the tapered shaft 211 will squeeze the sidewalls of the multiple protrusions 313 as the multiple elastic plates 312 and the protrusions 313 slide upward. When the protrusions 313 on the multiple elastic plates 312 are squeezed by the tapered shaft 211, the tapered shaft 211 will exert a forced and uniform force on the multiple elastic plates 312 through the multiple protrusions 313. By spreading outwards, it is possible to ensure that when multiple elastic plates 312 expand outwards under downward pressure, the uneven expansion of multiple elastic plates 312 due to friction or uneven downward pressure can lead to asynchronous or uneven expansion. By ensuring that multiple elastic plates 312 expand outwards synchronously, it is possible to reduce the uneven support force on the hole walls of the steel strip caused by uneven expansion of multiple elastic plates 312, which would result in the holes exhibiting elliptical or irregular shapes under load. This further enhances the support strength and uniformity of the holes in the steel strip, and further improves the punching and production efficiency of the chain links during saw chain production.

[0042] When the upper template 121 slides upward to reset after punching the steel strip through the model plate 122, the fixing ring 311 and multiple elastic plates 312 slide downward during the upward sliding of the upper template 121. Simultaneously, the spring plate 212, under its own elasticity, pushes the multiple elastic plates 312 downward and assists in their reset and retraction. At the same time, when the fixing ring 311 slides downward, the protruding plate on the fixing ring 311 separates from the right-angle plate 222. At this time, the right-angle plate 222 and the trapezoidal block 221 reset under the elastic potential energy release force of the reset spring. When the trapezoidal block 221 and the right-angle plate 222 reset, the bottom of the trapezoidal block 221 is no longer in contact with the top of the fixing ring 311. At this time, the elastic plates 312 and the fixing ring 311 can... The limiting shaft 301 moves within the sliding groove on the tapered shaft 211. When the subsequent steel belt is conveyed and pushes the punched chain to move, the movement of the chain caused by the steel belt to cause the elastic plate 312, after shrinking and resetting, to deflect within the holes of the chain as the chain moves. The deflection of the fixed ring 311 driven by multiple elastic plates 312 ensures that the chain can be accurately separated from the elastic plate 312 when it is pushed. This reduces the possibility of the elastic plate 312 not separating from the holes in time, which would restrict the chain from sliding and cause chain residue. This ensures the cleanliness of the bottom of the mold plate 122 during subsequent steel belt conveying and punching, further improving the continuity and efficiency of chain production, and further increasing the production intensity of saw chain production.

[0043] When multiple elastic plates 312 drive the fixed ring 311 to slide upward, the sliding of the multiple elastic plates 312 will drive the elastic plates 312 to slide upward synchronously through the protrusions 313. At the same time, when the conical shaft 211 squeezes the multiple protrusions 313, the conical tip of the conical shaft 211 will insert into the middle region of the torsion spring 314 and generate an elastic expansion of the torsion spring 314 from the middle outward. Then, when the multiple elastic plates 312 drive the fixed ring 311 to slide downward, the torsion spring 314 will separate from the conical shaft 211. When the torsion spring 314 separates from the conical shaft 211, the torsional contraction potential energy of the torsion spring 314 is released. The protrusions 313 on the multiple elastic plates 312 can drive the elastic plates 312 to contract synchronously, thereby ensuring the consistency of the multiple elastic plates 312 when they contract and reset. This reduces the possibility of incomplete contraction and reset due to excessive stress concentration when the multiple elastic plates 312 expand outward over a long period of time and periodically. At the same time, the contraction of the multiple torsion springs 314 can ensure both the consistency of the contraction of the multiple elastic plates 312 and the initial alignment after the multiple elastic plates 312 have contracted and reset, thereby improving the controllability of the expansion and contraction of the multiple elastic plates 312 and improving the production efficiency of the saw chain.

[0044] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A fully automatic saw chain production equipment, comprising a main body (1), wherein a conveyor (101) is fixedly connected to the left side of the main body (1), and a driver (102) is fixedly connected to the back side of the conveyor (101), characterized in that, Also includes: Fixing mechanism (2), which is installed on the side wall of the main body (1) to prevent the chain from deforming during the punching process when the steel strip is punched into chain pieces; The auxiliary mechanism (3) is installed at the bottom of the fixed mechanism (2) to ensure the stable reset of the fixed mechanism (2) and the centering of the auxiliary mechanism (3) during punching when the fixed mechanism (2) is working.

2. The fully automatic saw chain production equipment according to claim 1, characterized in that: The main body (1) includes: A drive assembly (11) is mounted on the side wall of the main body (1); A blanking assembly (12) is mounted on the bottom of the drive assembly (11).

3. The fully automatic saw chain production equipment according to claim 2, characterized in that: The fixing mechanism (2) includes several fixing brackets (201) disposed at the bottom of the punching assembly (12), and the fixing mechanism (2) further includes: A limiting component (21) is mounted on the bottom of the fixing frame (201); A sliding component (22) is mounted on the side wall of the fixed frame (201).

4. The fully automatic saw chain production equipment according to claim 3, characterized in that: The auxiliary mechanism (3) includes a limiting shaft (301) disposed at the bottom of the fixed frame (201), and the auxiliary mechanism (3) further includes: Deformation component (31) is installed at the bottom of the fixing frame (201).

5. The fully automatic saw chain production equipment according to claim 3, characterized in that: The drive assembly (11) includes a punching shaft (111) rotatably connected to the inner wall of the top of the main body (1). A lower template (112) is provided at the bottom of the punching shaft (111). The bottom of the lower template (112) is fixedly connected to the inner wall of the bottom of the main body (1). Several round holes are provided at the top of the lower template (112). The outer surface of the punching shaft (111) is connected to the output end of the driver (102) via a belt.

6. The fully automatic saw chain production equipment according to claim 5, characterized in that: The punching assembly (12) includes an upper template (121) fixedly connected to the bottom of the punching shaft (111), and a plurality of template plates (122) are fixedly connected to the bottom of the upper template (121). Two round holes (123) are provided at the bottom of the upper template (121) located inside the model plate (122).

7. The fully automatic saw chain production equipment according to claim 6, characterized in that: The fixing bracket (201) is fixedly connected to the inside of the circular hole (123); The limiting component (21) includes a tapered shaft (211) fixedly connected to the bottom of the fixing frame (201), and the side wall of the tapered shaft (211) is provided with a sliding groove; A spring plate (212) is provided on the outer surface of the tapered shaft (211), and the top of the spring plate (212) is fixedly connected to the bottom of the fixing frame (201).

8. The fully automatic saw chain production equipment according to claim 7, characterized in that: The sliding assembly (22) includes two trapezoidal blocks (221) slidably connected to the outer surface of the tapered shaft (211), and right-angle plates (222) are fixedly connected to the side walls of the two trapezoidal blocks (221). The two trapezoidal blocks (221) are fixedly connected to an L-plate on the side away from the right angle plate (222). A return spring is fixedly connected to the side wall of the L-plate, and the end of the return spring away from the L-plate is fixedly connected to the top of the fixing frame (201).

9. The fully automatic saw chain production equipment according to claim 4, characterized in that: The limiting shaft (301) is slidably connected inside the sliding groove; The deformation component (31) includes a fixing ring (311) fixedly connected to the side wall of the limiting shaft (301), and a protruding plate is fixedly connected to the outer wall of the fixing ring (311) near the right angle plate (222); The bottom of the fixed ring (311) is fixedly connected to several elastic plates (312). The sidewall of the elastic plate (312) is wavy.

10. A fully automatic saw chain production equipment according to claim 9, characterized in that: The elastic plate (312) has a protrusion (313) fixedly connected to the outer wall of the side near the limiting shaft (301), and a torsion spring (314) is slidably connected between several of the protrusions (313). The end of the torsion spring (314) is fixedly connected to one of the protrusions (313).

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