Cleaning tool for cleaning attachments on inner wall of circular hole

Abstract

The utility model discloses a removing tool for removing attachments on the inner wall of a round hole. The removing tool comprises a rotary driving device, a removing rod and abrasive paper. The abrasive paper is clamped on the cleaning rod, the cleaning rod is connected with the rotary output end through the connecting section, then the cleaning rod clamped with the abrasive paper extends into a chamber to be cleaned, the operating rod is rotated, the operating rod drives the rotary output end to rotate, the rotary output end drives the cleaning rod to rotate, and the cleaning rod drives the abrasive paper to rotate. Therefore, the gunpowder residues in the chamber to be removed are removed. The operating rod of the rotary driving device is perpendicular to the rotary output end, so that a large space is not needed in the axial direction of the cartridge chamber, the operating rod is rotated within the range with the large space in the circumferential direction of the cartridge chamber, and gunpowder residues in the cartridge chamber can be conveniently removed. By the adoption of the removing tool for removing the attachments on the inner wall of the round hole, gunpowder residues of a chamber can be removed without disassembling an aircraft gun, the time for disassembling and assembling the aircraft gun is saved, and therefore the removing efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of cleaning tools, and in particular to a cleaning tool for removing deposits from the inner wall of a circular hole. Background Technology

[0002] The high-temperature, high-pressure propellant gases produced during the charging of aircraft cannons contain propellant residue. Some of this residue forms a layer between the chamber and the surface of the projectile. This layer increases the resistance of the charging circuit, potentially causing charging failure. Therefore, the propellant residue layer in the chamber must be removed after charging.

[0003] refer to Figure 1 The cannon 6 is attached to the aircraft and electrically connected to it via cable 62. The propellant cartridge case 61 is located in the narrow space between the two cannon barrels 63. (Reference) Figure 2 The gunpowder cartridge chamber 61 has a chamber 611. In related technologies, removing the gunpowder residue layer from the chamber 611 requires removing the cannon 6 and cable 62 from the aircraft and using tools to grind the gunpowder residue into the chamber 611. Although this method of removal has no obstructions along the axial direction of the chamber 611, the time required for removing and installing the cannon 6 and cable 62 is relatively long, resulting in low removal efficiency. This affects the completion rate of increasingly frequent combat training missions and consequently affects the overall combat efficiency of the aircraft.

[0004] Therefore, it is necessary to remove the gunpowder residue without removing the cannon 6 and cable 62. In this case, the contactor box 64, which is hinged to the mouth of the chamber 611, can only be opened. However, one end of the contactor box 64 is hinged to the gunpowder chamber 61, and the other end is connected to the aircraft via cable 62. Therefore, when the contactor box 64 is opened, there is only 50-60mm of operating space along the axial direction of the chamber 611, and the original cleaning tools cannot be used. Utility Model Content

[0005] This application provides a cleaning tool for removing deposits from the inner wall of a circular hole, which can solve the technical problem of low efficiency in removing gunpowder residue from the chamber of a projectile in the prior art. The technical solution is as follows:

[0006] A cleaning tool for removing deposits from the inner wall of a round hole, comprising:

[0007] A rotary drive device has a rotary output end and an operating rod perpendicular to the rotary output end, the operating rod being used to drive the rotary output end to rotate;

[0008] The cleaning rod includes a connecting section and a working section, the connecting section being used to connect to the rotary output end, and the working section having a snap-fit ​​structure;

[0009] And sandpaper, the sandpaper includes a card joint and an erasing part, the card joint is connected with the card joint structure, and the erasing part is used for removing the attachments on the inner wall of the round hole.

[0010] Optionally, the card joint structure is a linear slot penetrating the working section in the radial direction; the card joint is a card joint strip; the erasing part is an erasing strip; the card joint strip and the erasing strip are connected as a whole; the card joint strip is located in the linear slot; and the erasing strip is wound at least one turn on the removing rod.

[0011] Optionally, the card joint structure is a cross slot arranged on the working section, the central axis of the cross slot coincides with the central axis of the removing rod, the cross slot includes a left horizontal slot, a right horizontal slot, an upper vertical slot and a lower vertical slot which constitute a cross; the left horizontal slot and the upper vertical slot constitute a first right-angle slot, the left horizontal slot and the lower vertical slot constitute a second right-angle slot, the right horizontal slot and the upper vertical slot constitute a third right-angle slot, and the right horizontal slot and the lower vertical slot constitute a fourth right-angle slot; the card joint is a card joint strip; the erasing part is an erasing strip; and the card joint strip is located in any one of the first right-angle slot, the second right-angle slot, the third right-angle slot and the fourth right-angle slot.

[0012] Optionally, the card joint structure is a cross slot arranged on the working section, the central axis of the cross slot coincides with the central axis of the removing rod, the cross slot includes a left horizontal slot, a right horizontal slot, an upper vertical slot and a lower vertical slot which constitute a cross; the card joint is a cross strip; the erasing part is an erasing cylinder; the cross strip is located in the erasing cylinder and connected as a whole with the erasing cylinder; and the cross strip is located in the cross slot.

[0013] Optionally, the rotating driving device has a clockwise driving working mode and an anticlockwise driving working mode; in the clockwise driving working mode, the operating rod is rotated clockwise, and the rotating output end has a rotating driving force; and in the anticlockwise driving working mode, the operating rod is rotated anticlockwise, and the rotating output end has a rotating driving force.

[0014] Optionally, the rotating driving device is a ratchet wrench, the ratchet wrench has a clockwise driving working mode and an anticlockwise driving working mode, and the ratchet wrench switches the clockwise driving working mode and the anticlockwise driving working mode through a reversing button.

[0015] Optionally, the working section has a tapered head at the end away from the connecting section.

[0016] Optionally, the connecting section has a hexagonal prism insertion hole, and the rotating output end is a hexagonal prism insertion plug matched with the hexagonal prism insertion hole.

[0017] The technical scheme provided by the embodiment has at least the following beneficial effects:

[0018] The application discloses a cleaning tool for cleaning the attachment on the inner wall of a round hole, which comprises a rotating driving device, a cleaning rod and sandpaper. The sandpaper is clamped on the cleaning rod, the cleaning rod is connected with the rotating output end of the rotating driving device through a connecting section, the cleaning rod with the sandpaper clamped thereon is inserted into the barrel to be cleaned, the rotating output end is rotated by rotating the operating lever, the cleaning rod is rotated by the rotating output end, and the sandpaper is rotated by the cleaning rod, so that the gunpowder residues in the barrel to be cleaned are removed. The operating lever of the rotating driving device is perpendicular to the rotating output end, so that the operating lever can be rotated in the range of the larger space along the circumference of the barrel. Compared with the cleaning method of moving along the axis of the barrel in the prior art, the cleaning tool for cleaning the attachment on the inner wall of a round hole can be rotated along the circumference of the barrel, so that the gunpowder residues in the barrel can be conveniently removed.

[0019] Other features and advantages of the present disclosure will be described in detail in the following detailed description section. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a three-dimensional schematic view of the contactor box of the aircraft gun in a closed state;

[0022] Figure 2 is Figure 1 a three-dimensional schematic view of the gunpowder cartridge chamber in the

[0023] Figure 3 is a three-dimensional schematic view of the contactor box of the aircraft gun in an open state and the cleaning of gunpowder residues by using the cleaning tool of the present application;

[0024] Figure 4 is a three-dimensional schematic view of the rotating driving device in the cleaning tool for cleaning the attachment on the inner wall of a round hole provided by the present application;

[0025] Figure 5 is a three-dimensional schematic view of the cleaning tool for cleaning the attachment on the inner wall of a round hole provided by the present application;

[0026] Figure 6This is a three-dimensional schematic diagram of the first cleaning rod of the cleaning tool for removing deposits from the inner wall of a circular hole provided in the embodiments of this application;

[0027] Figure 7 This is a schematic diagram of the first type of sandpaper used to remove deposits from the inner wall of a circular hole, as provided in the embodiments of this application.

[0028] Figure 8 yes Figure 7 The first type of sandpaper clip is attached to Figure 6 A three-dimensional schematic diagram of the first type of cleaning rod;

[0029] Figure 9 This is a schematic diagram showing the combined state of the first type of sandpaper and the first type of cleaning stick;

[0030] Figure 10 This is a three-dimensional schematic diagram of the second type of cleaning rod provided in the embodiments of this application for removing deposits from the inner wall of a circular hole;

[0031] Figure 11 This is a three-dimensional schematic diagram of the second type of sandpaper used as a cleaning tool for removing deposits from the inner wall of a circular hole, as provided in the embodiments of this application.

[0032] Figure 12 This is a schematic diagram showing the combination of the second type of sandpaper and the second type of cleaning stick;

[0033] Figure 13 This is a stereoscopic view of the second type of cleaning rod from another perspective.

[0034] Explanation of reference numerals in the attached figures

[0035] 1- Rotary drive device; 11- Rotary output end; 12- Operating lever; 13- Reversing button;

[0036] 2-Clearing rod; 21-Connecting section; 22-Working section; 23-Slotted groove; 24-Cross groove; 241-Left horizontal groove; 242-Right horizontal groove; 243-Upper vertical groove; 244-Lower vertical groove; 25-Conical head; 26-Hexagonal prism socket;

[0037] 3-Sandpaper; 31-Snap-fit ​​strip; 32-Erasing strip; 33-Cross strip; 34-Erasing cartridge;

[0038] 6-Cannon; 61-Gunpowder shell chamber; 611-Bow chamber; 62-Cable; 63-Cannon barrel; 64-Contaminator box. Detailed Implementation

[0039] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0040] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the relative positions of the corresponding components in the direction of gravity when they are in use, and "inner" and "outer" refer to their relative positions to the contours of the corresponding components themselves. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. In the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements.

[0041] refer to Figure 1 and Figure 2 The cannon 6 is connected to the aircraft and electrically connected to the aircraft via cable 62. The propellant shell chamber 61 is located in the narrow space between the two cannon barrels 63. The propellant shell chamber 61 has a chamber 611. In related technologies, removing the propellant residue layer requires removing the cannon 6 and cable 62 from the aircraft and using tools to reach into the chamber 611 to remove the propellant residue along the axial direction of the chamber 611. Although this method of removal has no obstructions along the axial direction of the chamber, the time required for removing and installing the cannon 6 and cable 62 is relatively long, resulting in low removal efficiency. This affects the completion rate of increasingly frequent combat training missions and, consequently, the overall combat efficiency of the aircraft.

[0042] Therefore, it is necessary to remove the gunpowder residue without removing the cannon 6 and cable 62. In this case, the contactor box 64, which is hinged to the mouth of the chamber 611, can only be opened. However, one end of the contactor box 64 is hinged to the gunpowder chamber, and the other end is connected to the aircraft via cable 62. Therefore, when the contactor box 64 is opened, there is only 50-60 mm of operating space along the axial direction of the chamber 611, while there is a large space along the circumference of the chamber 611. The original cleaning tools cannot be used, and there is an urgent need for a tool that is suitable for confined spaces and can effectively and quickly remove gunpowder residue.

[0043] According to the embodiments of this application, refer to Figure 4 and Figure 5 As shown, a cleaning tool for removing deposits from the inner wall of a circular hole is provided, comprising: a rotary drive device 1, a cleaning rod 2, and sandpaper 3.

[0044] Among them, reference Figure 4 and Figure 5 As shown, the rotary drive device 1 has a rotary output end 11 and an operating lever 12 perpendicular to the rotary output end 11, the operating lever 12 being used to drive the rotary output end 11 to rotate; Reference Figure 5 , Figure 6 and Figure 10 As shown, the cleaning rod 2 includes a connecting section 21 and a working section 22. The connecting section 21 is used to connect the rotating output end 11, and the working section 22 has a snap-fit ​​structure.

[0045] refer to Figure 7 , Figure 8 and Figure 11 As shown, the sandpaper 3 includes a snap-fit ​​part and a wiping part that are connected as one piece. The snap-fit ​​part is snapped into the snap-fit ​​structure, and the wiping part is used to remove the adhering material from the inner wall of the circular hole.

[0046] In the above embodiment, since it is not necessary to remove the cannon 6, and the cannon 6 is connected to the aircraft by a cable 62, the space along the axial direction of the chamber 611 is small when the contactor box 64 is opened, and conventional tools cannot be used. First, the sandpaper 3 is attached to the cleaning rod 2. The cleaning rod 2 is connected to the rotary output end 11 of the rotary drive device 1 through the connecting section 21. Then, the cleaning rod 2 with the sandpaper 3 attached is inserted into the chamber 611 to be cleaned. By rotating the operating lever 12, the operating lever 12 drives the rotary output end 11 to rotate, the rotary output end 11 drives the cleaning rod 2 to rotate, and the cleaning rod 2 drives the sandpaper 3 to rotate, thereby removing the gunpowder residue in the chamber 611 to be cleaned. The operating lever 12 of the rotary drive device 1 in this application is perpendicular to the rotary output end 11, so the operating lever 12 can be rotated within a range where a large space is not required along the axial direction of the chamber 611, but a large space is available along the circumference of the chamber 611. Compared to the cleaning methods in related technologies that involve axial movement along the chamber 611, the cleaning tool of this application for removing deposits from the inner wall of the circular hole can rotate circumferentially along the chamber 611, thus facilitating the removal of gunpowder residues within the chamber 611. Using the cleaning tool of this application, the gunpowder residues in the chamber 611 can be removed without disassembling the cannon 6 from the aircraft, saving time on disassembling and reassembling the cannon 6, and thus improving cleaning efficiency.

[0047] According to the embodiments of this application, refer to Figure 6 As shown, the snap-fit ​​structure is a slot 23 that radially penetrates the working section 22; Reference Figure 7 and Figure 8 As shown, the snap-fit ​​part of the sandpaper 3 is a snap-fit ​​strip 31, and the wiping part of the sandpaper 3 is a wiping strip 32. The snap-fit ​​strip 31 and the wiping strip 32 are integrated. The snap-fit ​​strip 31 is located within the slot 23, and the wiping strip 32 is wound around the cleaning rod 2 at least once. Preferably, the rotation direction of the cleaning rod 2 is opposite to the winding direction of the sandpaper 3, so that the sandpaper 3 will not wrinkle during the rotation of the cleaning rod 2. (Reference) Figure 9 As shown, in the above embodiment, since the snap-fit ​​strip 31 is inserted into the slot 23, a small angle is formed between the snap-fit ​​strip 31 and the wiping strip 32, which can reliably snap the snap-fit ​​part of the sandpaper 3 into the snap-fit ​​structure of the cleaning rod 2, and the length of the wiping strip 32 is at least one turn around the cleaning rod 2.

[0048] According to the embodiments of this application, refer toFigure 10 As shown, the snap-fit ​​structure is a cross groove 24 disposed in the working section 22. The central axis of the cross groove 24 coincides with the central axis of the cleaning rod 2. The cross groove 24 includes a left horizontal groove 241, a right horizontal groove 242, an upper vertical groove 243, and a lower vertical groove 244 forming a cross. The left horizontal groove 241 and the upper vertical groove 243 form a first right-angle groove, the left horizontal groove 241 and the lower vertical groove 244 form a second right-angle groove, the right horizontal groove 242 and the upper vertical groove 243 form a third right-angle groove, and the right horizontal groove 242 and the lower vertical groove 244 form a fourth right-angle groove. The snap-fit ​​part is a snap-fit ​​strip 31, and the wiping part is a wiping strip 32. The snap-fit ​​strip 31 is located in any one of the first right-angle groove, the second right-angle groove, the third right-angle groove, and the first right-angle groove. In this case, the snap-fit ​​strip 31 forms two bends in the cross groove 24, thus making the connection between the sandpaper 3 and the cleaning rod 2 more reliable and stable.

[0049] Alternatively, the snap-fit ​​structure is a cross groove 24 provided in the working section 22, the central axis of the cross groove 24 coinciding with the central axis of the cleaning rod 2, the cross groove 24 including a left horizontal groove 241, a right horizontal groove 242, an upper vertical groove 243, and a lower vertical groove 244 forming a cross; Reference Figure 11 and Figure 12 As shown, the engaging part is a cross bar 33, and the wiping part is a wiping cylinder 34. The cross bar 33 is located inside the wiping cylinder 34 and is integrally connected to the wiping cylinder 34; the cross bar 33 is located within the cross groove 24. In this case, the sandpaper 3 can reliably engage with the cleaning rod 2. When installing the sandpaper 3, simply align the cross bar 33 with the cross groove 24 and place the wiping cylinder 34 onto the cleaning rod 2. In this case, the sandpaper 3 needs to be customized to fit the diameter of the cleaning rod 2.

[0050] In the embodiments of this application, the rotary drive device 1 has a clockwise drive mode and a counterclockwise drive mode. In the clockwise drive mode, the operating lever 12 is rotated clockwise, and the rotary output end 11 has a rotary drive force. In the counterclockwise drive mode, the operating lever 12 is rotated counterclockwise, and the rotary output end 11 has a rotary drive force.

[0051] Example, reference Figure 4 and Figure 5As shown, the rotary drive device 1 is a ratchet wrench, which has a clockwise drive mode and a counterclockwise drive mode. The ratchet wrench switches between these modes via a reversing button 13. Taking the clockwise drive mode as an example, rotating the operating lever 12 clockwise rotates the output end 11, which in turn rotates the cleaning rod 2 to remove gunpowder residue. Rotating the operating lever 12 counterclockwise unlocks the output end 11, preventing the cleaning rod 2 from rotating to remove gunpowder residue. When using the ratchet wrench to rotate the cleaning rod 2, after the operating lever 12 rotates from the starting position to the ending position, there is no need to remove the ratchet wrench. Simply rotate the operating lever 12 in the opposite direction to return it to the initial position for a second rotation. This process can be repeated to quickly clear the chamber 611. When it is necessary to switch the working mode of the ratchet wrench, simply press the reversing button 13 to switch from one working mode to another.

[0052] Because the chamber 611 has a tapered hole, therefore, in the embodiments of this application, reference is made to... Figure 6 and Figure 10 The working section 22 has a tapered head 25 at one end opposite to the connecting section 21. In this way, when the cleaning rod 2 with the tapered head 25 is inserted into the chamber 611, and the operator applies a force inward along the axial direction of the chamber 611 to the cleaning rod 2, the cleaning rod 2 can automatically be centered in the chamber 611, thereby making the force uniform and the cleaning force consistent throughout the chamber 611.

[0053] In the embodiments of this application, reference is made to Figure 13 The connecting section 21 of the cleaning rod 2 has a hexagonal prism socket 26, and the rotating output end 11 is a hexagonal prism plug that matches the hexagonal prism socket 26. In other embodiments, the rotating output end 11 can also be a plug of other shapes, and correspondingly, the connecting section 21 of the cleaning rod 2 has a socket that matches the rotating output end 11. This application does not limit this.

[0054] The following detailed operating steps illustrate the implementation principle of the cleaning tool used in this application for removing deposits from the inner wall of a circular hole:

[0055] First, open the contactor box 64 of the aircraft cannon 6;

[0056] The second step is to insert the snap strip 31 of the sandpaper 3 into the slot 23 of the cleaning rod 2, wrap the wiping strip 32 of the sandpaper 3 around the cleaning rod 2 once, and cut off the excess wiping strip 32.

[0057] The third step is to connect the connecting section 21 of the cleaning rod 2 to the rotating output end 11 of the ratchet wrench;

[0058] The fourth step is to insert the cleaning rod 2, which is attached to the sandpaper 3, into the chamber 611 and rotate the operating rod 12 in the opposite direction to the winding direction of the sandpaper 3 to clean the chamber 611.

[0059] Fifth step: After cleaning is complete, close contactor box 64.

[0060] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0061] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0062] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A cleaning tool for removing deposits from the inner wall of a round hole, characterized in that, include: A rotary drive device (1) has a rotary output end (11) and an operating rod (12) perpendicular to the rotary output end (11), the operating rod (12) being used to drive the rotary output end (11) to rotate; The cleaning rod (2) includes a connecting section (21) and a working section (22), wherein the connecting section (21) is used to connect the rotating output end (11), and the working section (22) has a snap-fit ​​structure; And sandpaper (3), the sandpaper (3) includes a snap-fit ​​part and a wiping part that are integrated together, the snap-fit ​​part is snapped into the snap-fit ​​structure, and the wiping part is used to remove the adhering material on the inner wall of the round hole.

2. The cleaning tool for removing deposits from the inner wall of a circular hole according to claim 1, characterized in that, The snap-fit ​​structure is a slot (23) that radially penetrates the working section (22); The snap-fit ​​part is a snap-fit ​​strip (31), the wiping part is a wiping strip (32), the snap-fit ​​strip (31) and the wiping strip (32) are connected as one piece, the snap-fit ​​strip (31) is located in the slot (23), and the wiping strip (32) is wrapped around the cleaning rod (2) at least once.

3. The cleaning tool for removing deposits from the inner wall of a circular hole according to claim 1, characterized in that, The snap-fit ​​structure is a cross groove (24) provided in the working section (22). The central axis of the cross groove (24) coincides with the central axis of the cleaning rod (2). The cross groove (24) includes a left horizontal groove (241), a right horizontal groove (242), an upper vertical groove (243), and a lower vertical groove (244) that form a cross. The left horizontal groove (241) and the upper vertical groove (243) form a first right-angle groove. The left horizontal groove (241) and the lower vertical groove (244) form a second right-angle groove. The right horizontal groove (242) and the upper vertical groove (243) form a third right-angle groove. The right horizontal groove (242) and the lower vertical groove (244) form a fourth right-angle groove. The snap-fit ​​part is a snap-fit ​​strip (31), and the erasing part is an erasing strip (32); the snap-fit ​​strip (31) is located in any one of the first right-angle groove, the second right-angle groove, the third right-angle groove and the first right-angle groove.

4. The cleaning tool for removing deposits from the inner wall of a circular hole according to claim 1, characterized in that, The snap-fit ​​structure is a cross groove (24) provided in the working section (22). The central axis of the cross groove (24) coincides with the central axis of the cleaning rod (2). The cross groove (24) includes a left horizontal groove (241), a right horizontal groove (242), an upper vertical groove (243), and a lower vertical groove (244) that form a cross. The snap-fit ​​part is a cross bar (33), the wiping part is a wiping cylinder (34), the cross bar (33) is located inside the wiping cylinder (34) and is integrated with the wiping cylinder (34); The cross bar (33) is located within the cross groove (24).

5. The cleaning tool for removing deposits from the inner wall of a circular hole according to claim 1, characterized in that, The rotary drive device (1) has a clockwise drive mode and a counterclockwise drive mode. In the clockwise drive mode, the operating lever (12) is rotated clockwise, and the rotary output end (11) has a rotary drive force. In the counterclockwise drive mode, the operating lever (12) is rotated counterclockwise, and the output end (11) has a rotational driving force.

6. The cleaning tool for removing deposits from the inner wall of a circular hole according to claim 5, characterized in that, The rotary drive device (1) is a ratchet wrench, which has a clockwise drive mode and a counterclockwise drive mode. The ratchet wrench can switch between the clockwise drive mode and the counterclockwise drive mode by means of a reversing button (13).

7. The cleaning tool for removing deposits from the inner wall of a circular hole according to claim 1, characterized in that, The working section (22) has a tapered head (25) at one end away from the connecting section (21).

8. The cleaning tool for removing deposits from the inner wall of a circular hole according to claim 1, characterized in that, The connecting section (21) has a hexagonal prism socket (26), and the rotating output end (11) is a hexagonal prism plug that matches the hexagonal prism socket (26).

Images