A drive shaft delivery device

Abstract

The utility model discloses a transmission shaft conveying device, including frame, the top of frame is connected with the conveying channel that is inclined to one end, the lowest end in conveying channel is equipped with the opening that is rectangular, and the top material mechanism is installed below the opening on the frame, the end portion of conveying channel is installed with the material pushing positioning mechanism close to the opening, and the material pushing positioning mechanism includes the mounting panel, guide slot, linear displacement mechanism, sliding seat, pressure bar, first cylinder, slide, positioning plate and positioning mechanism, the transmission shaft in conveying channel is pushed up by the opening through the top material mechanism, and transmission shaft is sent to the guide slot. This transmission shaft conveying device can orderly, efficiently convey transmission shaft, and can fix and rotate transmission shaft at the end of conveying, so that subsequent processing, improve the conveying efficiency of transmission shaft.

Description

Technical Field

[0001] This utility model relates to the field of transmission shaft conveying technology, specifically a transmission shaft conveying device. Background Technology

[0002] The drive shaft is a core component of a mechanical transmission system, primarily used to transmit rotational power and torque. When machining the surface of the drive shaft, such as grinding or cleaning, it's necessary to first move it to the machining station. Currently, this is typically done manually, followed by securing the drive shaft with positioning fixtures, and finally processing it using equipment. This process results in low efficiency. Furthermore, the conveying and positioning processes are separate and not integrated, leading to large space requirements and high manufacturing costs for the guiding equipment. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a drive shaft conveying device to solve the problem that the drive shaft must be manually placed in the processing position before processing.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] A drive shaft conveying device includes a frame, with a conveying channel inclined to one end connected to the top of the frame. The lowest end of the conveying channel has a rectangular opening, and a material-lifting mechanism is mounted on the frame below the opening. A material-pushing and positioning mechanism is mounted on the end of the conveying channel near the opening. The material-pushing and positioning mechanism includes a mounting plate, a guide groove, a linear displacement mechanism, a slide, a pressure rod, a first cylinder, a sliding plate, a positioning plate, and a positioning mechanism. The mounting plate is fixed to the conveying channel with screws, and the guide groove is fixed to the mounting plate with screws, with the guide groove near the opening. One end of both the mounting plate and the guide groove extends to the outside of the frame. The extended end of the guide groove has a notch on the side facing the conveying channel. The linear displacement mechanism is mounted on the mounting plate away from the opening. On one side, the slide is driven by a linear displacement mechanism, which drives the slide to move linearly on the mounting plate. The pressure rod is connected to the top of the slide by screws. A downward-extending push block is provided at the end of the pressure rod away from the slide. The lower end of the push block is movably set in the guide groove. The first cylinder is installed on the bottom surface of the mounting plate. The telescopic end of the first cylinder is connected to the slide plate. The positioning plate is fixed to the slide plate by screws. A rotating shaft is rotatably connected to the positioning plate. A pneumatic chuck is fixedly connected to the end of the rotating shaft facing the mounting plate. A drive mechanism for driving the rotating shaft to rotate is provided on the side of the positioning plate away from the mounting plate. A pressure groove is provided on the bottom surface of the push block facing the positioning plate. The top material mechanism pushes the drive shaft in the conveying channel upward from the opening and sends the drive shaft into the guide groove.

[0006] Preferably, the conveying channel includes a base plate, which is inclinedly and fixedly connected to the upper end of the frame. A partition is fixed in the middle of the base plate, and first screw holes are provided on both sides of the base plate. L-shaped limiting plates are provided on the base plate on both sides of the partition. First strip holes matching the first screw holes are provided on the limiting plates. The limiting plates are installed on the base plate by screws, the first strip holes and the first screw holes. Openings are provided on the base plate between the partition and the two limiting plates. A wall plate is connected to the lowest end of the base plate. The ends of the partition and the limiting plates are connected to the wall plate. The mounting plate is fixed to the side of the wall plate away from the partition by screws.

[0007] With the above technical solution, the limiting plate is connected to both sides of the base plate by screws. The position of the limiting plate and the partition can be adjusted according to the length of the drive shaft so that the drive shaft can roll down between the partition and the limiting plate and prevent the drive shaft from deviating during rolling. By setting two rolling positions for the drive shaft, alternating feeding can be achieved, improving feeding efficiency.

[0008] Preferably, the top material mechanism consists of two sets. The top material mechanism includes a side plate mounted to one end of the frame by screws, a first guide rail mounted on the side plate, a lifting plate slidably connected to the first guide rail, and a second cylinder mounted at the bottom of the side plate. The telescopic end of the second cylinder is connected to the bottom of the lifting plate. The top material mechanism also includes a top block mounted to the top of the lifting plate by screws. The top block is located directly below the opening. The top of the top block is inclined to one side of the guide groove. An upwardly protruding insert plate is connected to one side of the upper end of the top block. The lifting plate, the top block, and the insert plate have the same width, which is smaller than the width of the opening.

[0009] With the above technical solution, when the drive shaft rolls to the lowest end of the base plate, the drive shaft is located on the opening, where the length of the opening is less than the distance between the partition and the limiting plate, so that the length of the opening is less than the length of the drive shaft, to prevent the drive shaft from falling out of the opening. Then, the second cylinder is controlled to extend, driving the lifting plate to rise. The insert plate is first inserted through the opening. Through the cooperation of the insert plate and the wall plate, the drive shaft is restricted on the top block. Since the surface of the top block is inclined and tilted towards the guide groove, when the top block exceeds the guide groove, the drive shaft will roll towards the guide groove and fall into the guide groove.

[0010] Preferably, the linear displacement mechanism includes bearing seats fixedly connected to both ends of the mounting plate, a lead screw rotatably connected to the two bearing seats via a rotary bearing, a first motor installed at one end of the mounting base, and a second guide rail connected to one side of the guide groove. The first motor is drivenly connected to one end of the lead screw, and a slide block is threadedly connected to the lead screw. A first slide groove is provided on one side of the slide block, and it is slidably connected to the second guide rail through the first slide groove.

[0011] The above technical solution controls the first motor to work, drives the lead screw to rotate, and during the lead screw transmission process, drives the slide to move along the second guide rail, thereby driving the pressure rod and push block to move, so as to push the transmission axis positioning plate in the guide groove.

[0012] Preferably, the drive mechanism includes a second motor mounted on the outside of the positioning plate, a transmission rod connected to the second motor via a coupling, a first gear fixedly connected to the transmission rod, and a second gear fixedly connected to the rotating shaft, wherein the first gear meshes with the second gear.

[0013] The above technical solution controls the operation of the second motor, which, through the cooperation of the first and second gears, drives the rotating shaft to rotate, thereby driving the pneumatic chuck and its transmission shaft to rotate.

[0014] Preferably, the bottom surface of the mounting plate is connected to a slide bar, and the top of the slide plate is provided with a second slide groove that cooperates with the slide bar, and the slide bar is slidably disposed in the second slide groove.

[0015] Through the above technical solution, the stability of the skateboard can be improved by the cooperation of the slider and the second groove.

[0016] Preferably, the end of the slide plate away from the first cylinder is provided with a second screw hole, and a fastening screw is threadedly connected to the second screw hole. A second strip hole is opened at the lower part of the positioning plate, and the fastening screw is slidably disposed in the second strip hole. A fastening nut is threadedly connected to the outer end of the fastening screw.

[0017] By loosening the fastening nut, the positioning plate can be slid to adjust the height of the pneumatic chuck so that it can hold the drive shaft on the guide groove. Once the positioning plate is adjusted to the required height, the fastening nut can be tightened again.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) This transmission shaft conveying device can convey the transmission shaft in an orderly and efficient manner, and can fix and rotate the transmission shaft at the end of the conveying process so as to facilitate subsequent processing, thereby improving the conveying efficiency of the transmission shaft.

[0020] (2) By integrating the conveying and positioning of the drive shaft, the time interval between conveying and positioning of the drive shaft is shortened, while the area occupied by the equipment is reduced and the cost is lowered. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the present invention;

[0022] Figure 2 for Figure 1 There is a magnified view of a part;

[0023] Figure 3 This is a partial sectional view of the positioning plate.

[0024] Figure 4 This is a schematic diagram of the top-loading mechanism;

[0025] Figure 5 This is a schematic diagram of the present invention after removing the material pushing and positioning mechanism;

[0026] Figure 6 This is a schematic diagram of another aspect of the present invention;

[0027] Figure 7 A partial schematic diagram of the conveyor channel after removing one of the limiting plates;

[0028] In the diagram: 1-Frame, 2-Conveying channel, 201-Base plate, 202-Partition plate, 203-Limiting plate, 204-First strip hole, 205-Wall plate, 3-Opening, 4-Top material mechanism, 401-Side plate, 402-First guide rail, 403-Lifting plate, 404-Second cylinder, 405-Top block, 406-Insertion plate, 5-Pushing and positioning mechanism, 501-Mounting plate, 502-Guide groove, 503-Slide seat, 504-Pressure rod, 505-First Cylinder, 506-Slide plate, 507-Positioning plate, 508-Notch, 509-Push block, 510-Pneumatic chuck, 511-Pressure groove, 512-Bearing seat, 513-Lead screw, 514-First motor, 515-Second guide rail, 516-Second motor, 517-First gear, 518-Second gear, 519-Slide bar, 520-Second slide groove, 521-Fasting screw, 522-Second strip hole, 523-Fasting nut, 6-Drive shaft. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1

[0031] Please see Figures 1-7A drive shaft conveying device includes a frame 1. The top of the frame 1 is connected to a conveying channel 2 that is inclined to one end. The conveying channel 2 includes a base plate 201, which is inclinedly and fixedly connected to the upper end of the frame 1. A partition plate 202 is fixed in the middle of the base plate 201. First screw holes are provided on both sides of the base plate 201. L-shaped limiting plates 203 are provided on both sides of the partition plate on the base plate 201. First strip holes 204 that match the first screw holes are provided on the limiting plates 203. The limiting plates 203 are installed on the base plate 201 by screws, the first strip holes 204 and the first screw holes. An opening 3 is provided on the base plate between the partition plate 202 and the two limiting plates 203. The opening 3 is rectangular. A wall plate 205 is connected to the lowest end of the base plate 201. The ends of the partition plate 202 and the limiting plates 203 are connected to the wall plate 205. The limiting plate 203 is connected to both sides of the base plate 201 by screws. The position of the limiting plate 203 and the partition plate 202 can be adjusted according to the length of the drive shaft so that the drive shaft can roll down between the partition plate 202 and the limiting plate 203, and prevent the drive shaft from deviating when rolling. By setting the rolling position of the two drive shafts, alternating feeding can be achieved, improving feeding efficiency.

[0032] In addition, the length of opening 3 must be less than the distance between partition 202 and limiting plate 203, so that the length of opening 3 is less than the length of drive shaft, to prevent drive shaft from falling out of opening 3.

[0033] A top-feeding mechanism 4 is installed on the frame 1 below the opening 3. The top-feeding mechanism 4 consists of two sets. The top-feeding mechanism 4 includes a side plate 401 installed at one end of the frame by screws, a first guide rail 402 installed on the side plate, a lifting plate 403 slidably connected to the first guide rail, and a second cylinder 404 installed at the bottom of the side plate. The telescopic end of the second cylinder 404 is connected to the bottom of the lifting plate 403. The top-feeding mechanism 4 also includes a top block 405 connected to the top of the lifting plate 403 by screws. The top block 405 is located directly below the corresponding opening 3. The top of the top block 405 is inclined towards one side of the guide groove 502. An upwardly protruding insert plate 406 is connected to one side of the upper end of the top block 405. The lifting plate 403, the top block 405, and the insert plate 406 have the same width, which is smaller than the width of the opening 3, so that the lifting plate 403 can rise and fall within the opening 3. When the drive shaft rolls down to the lowest end of the base plate 201, the drive shaft is located on the opening 3. Then, the second cylinder 404 is controlled to extend, driving the lifting plate 403 to rise. The insert plate 406 is first inserted through the opening 3. Through the cooperation of the insert plate 406 and the wall plate 205, the drive shaft is restricted on the top block 405. Since the surface of the top block 405 is inclined and tilted towards the guide groove 502, when the top block 405 exceeds the guide groove 502, the drive shaft will roll towards the guide groove 502 and fall into the guide groove 502.

[0034] A material pushing and positioning mechanism 5 is installed on the wall panel of the conveying channel 2. The material pushing and positioning mechanism 5 includes a mounting plate 501, a guide groove 502, a linear displacement mechanism, a slide 503, a pressure rod 504, a first cylinder 505, a sliding plate 506, a positioning plate 507, and a positioning mechanism. The mounting plate 501 is fixed to the side of the wall panel 205 away from the partition by screws. The guide groove 502 is fixed to the mounting plate 501 by screws, and the guide groove 502 is close to the opening 3. One end of the mounting plate 501 and the guide groove 502 extends to the outside of the frame 1. The extended end of the guide groove 502 and the side facing the conveying channel are provided with a notch 508 to increase the machinable area of ​​the drive shaft surface. The linear displacement mechanism is set on the side of the mounting plate 501 away from the opening 3. The slide 503 is drivenly connected to the linear displacement mechanism. A linear displacement mechanism drives the slide 503 to move linearly on the mounting plate 501. The pressure rod 504 is connected to the top of the slide 503 by screws. A downwardly extending push block 509 is provided at the end of the pressure rod 504 away from the slide. The lower end of the push block 509 is movably disposed in the guide groove 502. The first cylinder 505 is installed on the bottom surface of the mounting plate 501. The telescopic end of the first cylinder 505 is connected to the slide plate 506. The positioning plate 507 is fixed to the slide plate 506 by screws. A rotating shaft is rotatably connected to the positioning plate 507. A pneumatic chuck 510 is fixedly connected to the end of the rotating shaft facing the mounting plate. A drive mechanism for driving the rotating shaft to rotate is provided on the side of the positioning plate 507 away from the mounting plate. A pressing groove 511 is provided on the bottom surface of the push block 509 facing the positioning plate 507. The pressing groove 511 can press one end of the drive shaft into the guide groove 502.

[0035] Specifically, the linear displacement mechanism includes bearing seats 512 fixedly connected to both ends of the mounting plate, a lead screw 513 rotatably connected to the two bearing seats via a rotary bearing, a first motor 514 mounted on one end of the mounting base, and a second guide rail 515 connected to one side of the guide groove. The first motor 514 is drivenly connected to one end of the lead screw 513, and a slide block 503 is threadedly connected to the lead screw 513. A first sliding groove is provided on one side of the slide block 503, and it is slidably connected to the second guide rail 515 through the first sliding groove. Controlling the first motor 514 to work drives the lead screw 513 to rotate. During the transmission process, the lead screw 513 drives the slide block 503 to move along the second guide rail 515, thereby driving the pressure rod 504 and the push block 509 to move, so as to push the transmission axial positioning plate 507 in the guide groove 502.

[0036] The drive mechanism includes a second motor 516 mounted on the outside of the positioning plate, a transmission rod connected to the second motor via a coupling, a first gear 517 fixedly connected to the transmission rod, and a second gear 518 fixedly connected to the rotating shaft. The first gear 517 and the second gear 518 mesh. Controlling the second motor 516 to operate, through the engagement of the first gear 517 and the second gear 518, drives the rotating shaft to rotate, thereby driving the pneumatic chuck 510 and its transmission shaft to rotate.

[0037] This embodiment also requires an air compressor to provide power to all cylinders and pneumatic chucks. The pneumatic chuck 510 uses compressed air to drive the jaws, enabling rapid clamping and release of workpieces; it is commonly found in lathes, CNC machine tools, and automated production lines.

[0038] The working principle of this embodiment is as follows:

[0039] Two belt conveyors are installed at one end of the frame 1, and the ends of the two belt conveyors are connected to the conveying channel 2, that is, the belt conveyors are connected to the partition plate 202 and the limiting plate 203. The belt conveyors convey the drive shaft 6 to the two conveying positions of the conveying channel 2. The drive shaft 6 rolls from the bottom plate 201 to its opening 2, and then the second cylinder 404 is controlled to extend, driving the lifting plate 403 to rise. The insert plate 406 is first inserted through the opening 3. Through the cooperation of the insert plate 406 and the wall plate 205, the drive shaft 6 is restricted on the top block 405. Since the surface of the top block 405 is inclined and tilted towards the guide groove 502, when the top block 405 exceeds the guide groove 502, the drive shaft will roll towards the guide groove 502 and fall into the guide groove 502. Then, the first motor 514 is controlled to operate, driving the lead screw 513 to rotate, which in turn moves the pressure rod 504 and the push block 509. The pressure groove 511 on the bottom surface of the push block 509 presses one end of the drive shaft 6, and pushes the drive shaft in the guide groove 502 to the positioning plate 507 until the drive shaft reaches the notch 508. Then, the first cylinder 505 is controlled to retract, causing the slide plate 506 to slide, so that the pneumatic chuck 510 clamps one end of the drive shaft 6, thus allowing the drive shaft to be processed. The second motor 516 is controlled to operate, and through the cooperation of the first gear 517 and the second gear 518, the rotating shaft is driven to rotate, thereby driving the pneumatic chuck 510 and the drive shaft on it to rotate, so as to perform comprehensive processing on the surface of the drive shaft. After processing, the drive shaft can be removed manually or by an external robotic arm.

[0040] Example 2

[0041] Based on Embodiment 1, the bottom surface of the mounting plate 501 is connected to a slide bar 519, and the top of the slide plate 506 is provided with a second slide groove 520 that cooperates with the slide bar. The slide bar 519 is slidably disposed within the second slide groove 520. The cooperation between the slide bar 519 and the second slide groove 520 improves the stability of the slide plate 506's movement.

[0042] The end of the slide plate 506 furthest from the first cylinder is provided with a second threaded hole, and a fastening screw 521 is threaded into the second threaded hole. The lower part of the positioning plate 507 is provided with a second strip-shaped hole 522, and the fastening screw 521 is slidably disposed in the second strip-shaped hole 522. The outer end of the fastening screw 521 is threadedly connected to a fastening nut 523. Loosening the fastening nut 523 allows the positioning plate 507 to slide, thereby adjusting the height of the pneumatic chuck 510 so that the pneumatic chuck 510 can clamp the drive shaft 6 on the guide groove 502. After the positioning plate 507 is adjusted to the required height, the fastening nut 523 is tightened again.

[0043] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A transmission shaft conveying device, characterized in that: Includes a frame (1), the top of the frame (1) is connected to a conveying channel (2) that is inclined to one end, the lowest end of the conveying channel (2) is provided with a rectangular opening (3), and a top material mechanism (4) is installed on the frame (1) below the opening (3). A material pushing and positioning mechanism (5) is installed at the end of the conveying channel (2) near the opening (3). The material pushing and positioning mechanism (5) includes a mounting plate (501), a guide groove (502), a linear displacement mechanism, a slide (503), a pressure rod (504), a first cylinder (505), a sliding plate (506), a positioning plate (507), and a positioning mechanism. The mounting plate (501) is fixed to the conveying channel (2) with screws, and the guide groove (502) is fixed to the mounting plate (501) with screws. The guide groove (502) is located on the side near the opening (3). One end of the mounting plate (501) and the guide groove (502) both extend to the outside of the frame (1). The extended end of the guide groove (502) and the side facing the conveying channel are provided with a notch (508). The linear displacement mechanism is located on the side of the mounting plate (501) away from the opening (3). The slide (503) is driven by the linear displacement mechanism. In the displacement mechanism, the slide (503) is driven to move linearly on the mounting plate (501) by a linear displacement mechanism. The pressure rod (504) is connected to the top of the slide (503) by screws. The end of the pressure rod (504) away from the slide is provided with a downwardly extending push block (509). The lower end of the push block (509) is movably set in the guide groove (502). The first cylinder (505) is installed on the bottom surface of the mounting plate (501). The telescopic end of the first cylinder (505) is connected to the slide plate (506). The positioning plate (507) is fixed on the slide plate (506) by screws. A rotating shaft is rotatably connected to the positioning plate (507). A pneumatic chuck (510) is fixedly connected to the end of the rotating shaft facing the mounting plate. A drive mechanism for driving the rotating shaft to rotate is provided on the side of the positioning plate (507) away from the mounting plate. A pressure groove (511) is provided on the side of the bottom surface of the push block (509) facing the positioning plate (507). The top material mechanism (4) pushes the drive shaft in the conveying channel (2) upward from the opening (3) and sends the drive shaft into the guide groove (502).

2. The transmission shaft conveying device according to claim 1, characterized in that: The conveying channel (2) includes a base plate (201), which is obliquely and fixedly connected to the upper end of the frame (1). A partition plate (202) is fixed in the middle of the base plate (201). First screw holes are provided on both sides of the base plate (201). L-shaped limiting plates (203) are provided on both sides of the partition plate on the base plate (201). First strip holes (204) matching the first screw holes are provided on the limiting plates (203). The mounting plate (501) is installed on the base plate (201) by the cooperation of screws, the first strip hole (204) and the first screw hole. An opening (3) is provided on the base plate between the partition (202) and the two limiting plates (203). The lowest end of the base plate (201) is connected to the wall plate (205). The ends of the partition (202) and the limiting plate (203) are connected to the wall plate (205). The mounting plate (501) is fixed to the side of the wall plate (205) away from the partition by screws.

3. The transmission shaft conveying device according to claim 2, characterized in that: The top material mechanism (4) consists of two sets. The top material mechanism (4) includes a side plate (401) installed on one end of the frame by screws, a first guide rail (402) installed on the side plate, a lifting plate (403) slidably connected to the first guide rail, and a second cylinder (404) installed at the bottom of the side plate. The telescopic end of the second cylinder (404) is connected to the bottom of the lifting plate (403). The top material mechanism (4) also includes a top block (405) connected to the top of the lifting plate (403) by screws. The top block (405) is located directly below the opening (3). The top of the top block (405) is inclined to one side of the guide groove (502). An upwardly protruding insert plate (406) is connected to one side of the upper end of the top block (405). The lifting plate (403), the top block (405), and the insert plate (406) have the same width and are smaller than the width of the opening (3).

4. The transmission shaft conveying device according to claim 3, characterized in that: The linear displacement mechanism includes bearing seats (512) fixedly connected to both ends of the mounting plate, a lead screw (513) rotatably connected to the two bearing seats via a rotary bearing, a first motor (514) installed at one end of the mounting base, and a second guide rail (515) connected to one side of the guide groove. The first motor (514) is connected to one end of the lead screw (513) via a transmission connection, and a slide block (503) is threadedly connected to the lead screw (513). A first sliding groove is provided on one side of the slide block (503), and it is slidably connected to the second guide rail (515) through the first sliding groove.

5. A transmission shaft conveying device according to claim 4, characterized in that: The drive mechanism includes a second motor (516) mounted on the outside of the positioning plate, a transmission rod connected to the second motor via a coupling, a first gear (517) fixedly connected to the transmission rod, and a second gear (518) fixedly connected to the rotating shaft, wherein the first gear (517) meshes with the second gear (518).

6. The transmission shaft conveying device according to claim 5, characterized in that: The bottom surface of the mounting plate (501) is connected to a slide bar (519), and the top of the slide plate (506) is provided with a second slide groove (520) that cooperates with the slide bar. The slide bar (519) is slidably disposed in the second slide groove (520).

7. A transmission shaft conveying device according to claim 6, characterized in that: The end of the slide plate (506) away from the first cylinder is provided with a second screw hole, and a fastening screw (521) is threadedly connected to the second screw hole. The lower part of the positioning plate (507) is provided with a second strip hole (522), and the fastening screw (521) is slidably disposed in the second strip hole (522). The outer end of the fastening screw (521) is threadedly connected with a fastening nut (523).

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