Stretching and swinging combined motion air cylinder

Abstract

The stretching and swinging combined motion air cylinder comprises a body, a stretching mechanism, a rotating mechanism and a connecting mechanism, wherein the stretching mechanism and the rotating mechanism are arranged in the body, and the connecting mechanism is connected with the stretching mechanism and the rotating mechanism. The telescopic mechanism comprises a guide rod, the guide rod is parallel to the center axis of the telescopic piston rod, and the guide rod is located in a guide hole of the piston so that the piston can move in the axial direction. A telescopic piston rod of the telescopic mechanism is installed in a piston through hole of a piston, the piston and the telescopic piston rod are in axial limiting connection so that the piston can drive the telescopic piston rod to do telescopic motion, and the telescopic piston rod can rotate relative to the piston. A square hole is formed in the inner end of the telescopic piston rod, the connecting mechanism is located in the square hole, and a rotating shaft of the rotating mechanism is fixedly connected with the connecting mechanism so as to drive the piston rod to rotate through the connecting mechanism. The composite motion cylinder can realize independent operation of telescoping and rotation without mutual interference, solves the phenomenon of blocking in the telescoping and rotation processes, and meets the requirement of automatic use.

Description

Technical Field

[0001] The present invention relates to the technical field of cylinders, and in particular to an extension-swing compound motion cylinder. Background Art

[0002] The beverage filling equipment uses an extension-swing composite motion cylinder (fake cup cylinder) to achieve self-cleaning. The extension-swing composite cylinder structure adopts a reciprocating cylinder plus a slide groove swing structure to achieve this function. The Chinese patent with publication number CN208474231U discloses an extension and rotation clamping cylinder, which is connected by nesting the front and rear piston rods and cooperates with two spiral grooves to achieve step-by-step movement of the extension and rotation steps. Utility Model Content

[0003] The existing extension and swing compound cylinder can only perform different steps of the two steps of extension and rotation according to the action sequence set by the spiral groove, and cannot achieve simultaneous or cross-action without interfering with each other. In addition, the existing extension and swing compound cylinder often freezes during use due to structural defects and processing accuracy problems, and cannot meet the requirements of automated use.

[0004] In view of the above problems, the present invention is proposed to provide an extension-swing compound motion cylinder that overcomes the above problems or at least partially solves the above problems.

[0005] The embodiment of the present invention provides an extension-swing compound motion cylinder, comprising: a body, a telescopic mechanism and a rotating mechanism arranged in the body, and a connecting mechanism connecting the telescopic mechanism and the rotating mechanism;

[0006] The telescopic mechanism comprises a guide rod, the guide rod is arranged parallel to the central axis of the telescopic piston rod, and the guide rod is located in the guide hole of the piston so that the piston can move axially;

[0007] The telescopic piston rod of the telescopic mechanism is installed in the piston through hole of the piston, and the piston and the telescopic piston rod are axially limitedly connected, so that the piston can drive the telescopic piston rod to telescope, and the telescopic piston rod can rotate relative to the piston;

[0008] A square hole is provided at the inner end of the telescopic piston rod, the connecting mechanism is located in the square hole, and the rotating shaft of the rotating mechanism is fixedly connected to the connecting mechanism so as to drive the telescopic piston rod to rotate through the connecting mechanism.

[0009] Further, the body comprises: a front end cover, a telescopic cylinder body, a rear end cover, a rotating cylinder body and a rotating cylinder cover which are connected in sequence;

[0010] The front end cover has a piston rod hole for installing a telescopic piston rod; the front end cover is provided with a retractable air inlet channel;

[0011] The telescopic cylinder is used to accommodate the telescopic mechanism;

[0012] The front cover and the rear cover are provided with guide rod mounting holes for mounting the guide rods; the rear cover is provided with an air inlet passage extending out;

[0013] The rotating cylinder is used to accommodate the rotating mechanism;

[0014] The rotating cylinder cover is provided with a left-handed air intake passage and a right-handed air intake passage.

[0015] In some optional embodiments, a sleeve is provided between the telescopic piston rod of the telescopic mechanism and the piston rod hole of the front end cover; a first seal is provided between the front end cover and the telescopic piston rod, and a second seal is provided between the rear end cover and the telescopic piston rod.

[0016] In some optional embodiments, the connecting mechanism has a square structure that matches the square hole. The connecting mechanism is provided with a connecting hole through which it is interference-connected with the rotating shaft. At least one annular groove is provided on the connecting structure.

[0017] In some optional embodiments, the material of the connecting mechanism is different from the material of the piston rod, and is different from the material of the rotating shaft of the rotating mechanism.

[0018] In some optional embodiments, the connecting mechanism is made of copper alloy.

[0019] In some optional embodiments, the rotating mechanism includes a swinging body and a rotating shaft;

[0020] The swing body is arranged in the rotating cylinder body, and the rotating shaft is fixedly connected to the swing body so as to swing along with the swing body.

[0021] In some optional embodiments, a stretch-swing compound motion cylinder further includes: a limit pin;

[0022] A limiting slide groove is provided on the rear end cover of the body;

[0023] A connecting block is provided between the rear end cover and the rotating mechanism;

[0024] One end of the limiting pin is installed on the connecting block, and the other end is located in the limiting sliding groove to limit the swing angle of the rotating mechanism.

[0025] In some optional embodiments, a telescopic and swinging combined motion cylinder further includes: an axial positioning block arranged between the rotating mechanism and the rear end cover of the main body, so that the swing body of the rotating mechanism remains coaxial with the rotating axis of the main body and the telescopic mechanism.

[0026] In some optional embodiments, a cylinder for combined extension and swing motion further includes: a fixed pin shaft;

[0027] A pin through hole is provided on the swinging body and the rotating cylinder cover of the rotating mechanism, and a pin connecting hole is provided on the rear end cover. The fixed pin passes through the pin through hole and is connected to the pin connecting hole.

[0028] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0029] The extension and swing compound motion cylinder provided by the embodiment of the present invention realizes the extension and rotation motion of the piston rod through the extension mechanism and the rotation mechanism arranged in the body, and the connection mechanism connecting the extension mechanism and the rotation mechanism, and the extension and rotation motion can be realized independently without interfering with each other; wherein, the extension piston rod drives the extension and contraction of the extension piston rod along the axial direction under the cooperation of the guide rod and the piston of the extension mechanism; the rotation mechanism drives the extension piston rod to rotate and swing through the connection mechanism arranged in the square hole of the extension piston rod. The connection mechanism can move axially in the square hole, therefore, the extension and contraction and rotation of the extension piston rod can be realized separately or simultaneously without interfering with each other, and no jamming will occur, which can meet the requirements of automated use.

[0030] The connecting mechanism of the compound motion cylinder can adopt a square elastic design to ensure the effective transmission of rotational power. Even if the telescopic piston rod and the rotating axis of the rotating mechanism have a certain eccentricity, the effective and smooth transmission of rotational power can be guaranteed, so that the rotation and telescopic transportation of the cylinder will not be stuck; and further, the swing amplitude can be limited by limiting the sliding groove and the pin.

[0031] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0032] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the extension-swing compound motion cylinder in an embodiment of the present invention;

[0035] Figure 2 It is a cross-sectional view of the rear end cover of the extension-swing compound motion cylinder in an embodiment of the present invention;

[0036] Figure 3It is a cross-sectional view of the extension-swing compound motion cylinder HH in an embodiment of the present invention;

[0037] Figure 4 It is a right side view of the rear end cover in the embodiment of the present invention;

[0038] Figure 5 It is a schematic diagram of the three-dimensional structure of the connecting mechanism in an embodiment of the present invention.

[0039] In the attached picture:

[0040] 1. Front cover; 2. Bushing; 3. Rear cover; 4. Telescopic cylinder; 5. Guide rod;

[0041] 11. Rotating cylinder body; 12. Rotating cylinder cover; 13. Fixed pin shaft; 14. Swinging body; 15. Rotating shaft; 16. Connecting mechanism; 17. Connecting block; 18. Axial positioning block; 19. Limiting pin; 22. Telescopic piston rod; 23. Piston;

[0042] 101, retract the air inlet channel; 301, extend the air inlet channel; 302, limit slide groove;

[0043] 701, a first sealing member; 702, a second sealing member;

[0044] 121. Left-handed air intake passage; 122. Right-handed air intake passage;

[0045] 161. Connecting hole; 162. Annular groove. DETAILED DESCRIPTION

[0046] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0047] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In order to solve the problems existing in the prior art, the embodiment of the present invention provides a stretch-swing compound motion cylinder. The structure of the stretch-swing compound motion cylinder is shown in FIG. Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, Figure 1 is a schematic diagram of the three-dimensional structure of the cylinder. Figure 2 This is a cross-sectional view of the rear end cover of the cylinder. Figure 3 This is the HH section of the cylinder. Figure 4 The right side view of the rear end cover of the cylinder; the extension and swing compound motion cylinder comprises: a body, a telescopic mechanism and a rotating mechanism arranged in the body, and a connecting mechanism 16 connecting the telescopic mechanism and the rotating mechanism;

[0050] The telescopic mechanism includes a guide rod 5, which is arranged parallel to the central axis of the telescopic piston rod 22, and is located in the guide hole of the piston 23 so that the piston 23 can move axially; the telescopic piston rod 22 of the telescopic mechanism is installed in the piston through hole of the piston 23, and the piston 23 and the telescopic piston rod 22 are axially limited and fixed by a clamping ring, so that the piston 23 can drive the telescopic piston rod 22 to telescopically move; and the telescopic piston rod 22 can rotate relative to the piston 23;

[0051] A square hole is provided at the inner end of the telescopic piston rod 22 , and the connecting mechanism 16 is located in the square hole. The rotating shaft 15 of the rotating mechanism is fixedly connected to the connecting mechanism 16 , so as to drive the telescopic piston rod 22 to rotate through the connecting mechanism 16 .

[0052] Optionally, the above-mentioned main body includes: a front end cover 1, a telescopic cylinder body 4, a rear end cover 3, a rotating cylinder body 11 and a rotating cylinder cover 12 connected in sequence; the front end cover 1 has a piston rod hole to install the telescopic piston rod 22; the front end cover 1 is provided with a retracting air inlet channel 101; the telescopic cylinder body 4 is used to accommodate the telescopic mechanism; the front end cover 1 and the rear end cover 3 are provided with guide rod mounting holes to install the guide rod 5; the rear end cover is provided with an extending air inlet channel 301; the rotating cylinder body 11 is used to accommodate the rotating mechanism; the rotating cylinder cover 12 is provided with a left-handed air inlet channel 121 and a right-handed air inlet channel 122.

[0053] Optionally, the telescopic mechanism includes a telescopic piston rod 22, a guide rod 5 and a piston 23. The guide rod 5 of the telescopic mechanism is passed through the piston 23 to fix and guide. The piston 23 and the telescopic piston rod 22 are axially limited and fixed by a retaining ring, and the piston 23 is rotatably connected to the telescopic piston rod 22 by the retaining ring. The influence of the eccentric load on the piston seal ring can be avoided. The telescopic piston rod 22 is hollow, and the connecting sleeve can slide in it. A shaft sleeve 2 is provided between the telescopic piston rod 22 of the telescopic mechanism and the piston rod hole of the front end cover 1; a first seal 701 is provided between the front end cover 1 and the telescopic piston rod 22, and a second seal 702 is provided between the rear end cover 3 and the telescopic piston rod 22.

[0054] Optionally, the rotating mechanism includes a swinging body 14 and a rotating shaft 15 ; the swinging body 14 is disposed in the rotating cylinder body 11 , and the rotating shaft 15 is fixedly connected to the swinging body 14 so as to swing along with the swinging body 14 .

[0055] See also Figure 1 As shown, the above-mentioned extension and swing compound motion cylinder, the rotating mechanism, the rotating cylinder body 11 and the rotating cylinder cover 12 can form a rotating cylinder unit, that is, Figure 1 telescopic mechanism, telescopic cylinder 4, front cover 1 and rear cover 3 can form a telescopic cylinder unit, that is Figure 1 B unit is provided with a left-handed air intake channel 121 and a right-handed air intake channel 122, and A unit is provided with a retracted air intake channel 101 and an extended air intake channel 301.

[0056] Optionally, the connecting mechanism 16 has a square shape matching the square hole, and the connecting mechanism 16 is provided with a connecting hole 161, through which the connecting hole is interference-connected with the rotating shaft 15; and the connecting mechanism 16 is provided with at least one annular groove 162. Figure 5 As shown, the connection mechanism is a connection sleeve, which is a square columnar structure with a circular chamfer; one end of the connection mechanism is provided with a connection hole to install the rotating shaft, and three annular grooves are provided on the upper side. The annular grooves are spiral grooves. The spiral grooves are provided to make the connection sleeve elastic and can transmit power eccentrically, which can make the connection sleeve flexible and ensure that its rigidity is sufficient to transmit torque; the connection sleeve can also be provided with a threaded hole to install a locking screw. The connection sleeve can rotate with the rotating shaft of the rotating mechanism, and can drive the telescopic piston rod to rotate through the cooperation of the square structure and the square hole on the telescopic piston rod. At the same time, because its square structure can move axially in the square hole, it does not affect the telescopic piston rod. Through the connection sleeve, the rotation and telescopic motion can be realized without affecting each other, and the rotation and telescopic motion can be realized at the same time, or they can be realized independently. The composite motion cylinder realizes the integrated structure design of fastening and guiding through the composite structure of A and B units and the connection transmission of the elastic quadrilateral, and its A and B units can be disordered and single-acting.

[0057] Preferably, the material of the connection mechanism 16 is different from the material of the telescopic piston rod 22, and is also different from the material of the rotating shaft 15 of the rotating mechanism. Preferably, the material of the connection mechanism 16 is copper alloy.

[0058] Optionally, the above-mentioned extension and swing compound motion cylinder further includes a limit pin 19; a limit slide groove 302 is provided on the rear end cover 3 of the body, see Figure 4 As shown in the figure, a connecting block 17 is provided between the rear end cover 3 and the rotating mechanism; one end of the limiting pin 19 is mounted on the connecting block 17, and the other end is located in the limiting slide groove 302 to limit the swing angle of the rotating mechanism. The connecting block 17 can be nested in one end of the connecting mechanism 16 close to the swing body 14. The connecting block 17 and the connecting mechanism 16 can be connected by interference fit or by a set screw.

[0059] Optionally, the above-mentioned extension and swing compound motion cylinder further includes: an axial positioning block 18 disposed between the rotating mechanism and the rear end cover of the body, so that the swing body of the rotating mechanism and the body and the telescopic piston 23 of the telescopic mechanism remain coaxial. The axial positioning block 18 can be installed on the swing body 14, located between the connecting block 17 and the swing body 14.

[0060] Optionally, the above-mentioned extension and swing compound motion cylinder also includes a fixed pin 13; a pin through hole is provided on the swing body and the rotating cylinder cover of the rotating mechanism, and a pin connecting hole is provided on the rear end cover, and the fixed pin 13 passes through the pin through hole and is connected to the pin connecting hole.

[0061] The actions that can be achieved by the above-mentioned extension and swing compound motion cylinder are described as follows:

[0062] Taking the main body as the reference, the main body is stationary;

[0063] The telescopic piston rod 22 realizes telescopic movement driven by the piston 23;

[0064] The telescopic piston rod 22 is driven by the rotating mechanism to swing under the transmission of the connecting mechanism 16;

[0065] Since the limiting pin 19 connected to the swing connection block 17 is limited by the limiting slot in the rear end cover, the swing amplitude of the telescopic piston rod 22 during the swinging process is limited within a certain angle range, thereby achieving swing angle limitation.

[0066] For example, the extension and swing compound motion cylinder is usually limited to the piston rod retracting left rotation. According to the external air supply, it realizes the combined action based on the following 4 action conditions:

[0067] Action 1: Supply air to the air inlet passage of unit A, and the telescopic piston rod extends;

[0068] The A unit is extended to the air inlet passage to inlet air, and the telescopic piston 23 moves along the guide rod toward the front end cover 1, driving the telescopic piston rod 22 to extend.

[0069] Action 2: supply air to the retracting air inlet passage of unit A, and the telescopic piston rod retracts;

[0070] Air is supplied to the retracted air inlet passage of unit A, and the telescopic piston 23 moves along the direction of the guide rear end cover 3, driving the telescopic piston rod 22 to retract.

[0071] Action 3: Supply air to the right-handed air inlet passage of unit B, and the telescopic piston rod rotates right;

[0072] The B unit is fed with air into the right-handed inlet channel, and the swing body 14 drives the rotating shaft 15 to rotate right-handed, and the rotating shaft drives the telescopic piston rod 22 to rotate right-handed through the connecting mechanism 16 .

[0073] Action 4: Supply air to the left-handed air inlet passage of unit B, and the telescopic piston rod rotates left;

[0074] The air inlet passage 121 of the B unit is rotated counterclockwise, and the swing body 14 drives the rotating shaft 15 to rotate counterclockwise, and the rotating shaft drives the telescopic piston rod 22 to rotate counterclockwise through the connecting mechanism 16.

[0075] The above actions between the AB units do not affect each other. That is, the air intake through the rotating air intake channel of the B unit and the air intake through the telescopic air intake channel of the A unit can realize the independent rotation and telescopic operation of the telescopic piston rod 22 without affecting each other.

[0076] The above-mentioned extension and swing compound motion cylinder can realize extension and rotation independently through the extension mechanism and the rotation mechanism respectively. Through the setting of the connecting sleeve and the cooperation of the extension mechanism and the rotation mechanism, the extension and rotation can be carried out at any time without interfering with each other, thereby better realizing the cleaning of the filling bottle.

[0077] The extension and swing compound motion cylinder adopts the structure of telescopic cylinder plus swing cylinder. This structure is not affected by processing accuracy and assembly accuracy, and can avoid problems such as poor accuracy caused by spiral groove wear. The extension and swing compound motion cylinder solves the eccentricity problem that may be caused by the coupling through the cooperation of the connection mechanism and the axial positioning block mechanism. The structure is simple and ingenious; the product is smooth and coherent during use, with good stability, and can meet the high-intensity automation requirements of the beverage production industry.

[0078] The above-mentioned extension and swing compound motion cylinder can use a stainless steel shell to completely cover the swing cylinder, so that the entire product surface is made of stainless steel, meeting the requirements of food engineering equipment.

[0079] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0080] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A cylinder with extension and swing combined motion, characterized in that: include: A body, a telescopic mechanism and a rotating mechanism disposed in the body, and a connecting mechanism connecting the telescopic mechanism and the rotating mechanism; The telescopic mechanism comprises a guide rod and a telescopic piston rod, wherein the guide rod is arranged parallel to the central axis of the telescopic piston rod and is located in the guide hole of the piston so that the piston can move axially; The telescopic piston rod of the telescopic mechanism is installed in the piston through hole of the piston, and the piston and the telescopic piston rod are axially limitedly connected, so that the piston can drive the telescopic piston rod to telescope, and the telescopic piston rod can rotate relative to the piston; A square hole is provided at the inner end of the telescopic piston rod, the connecting mechanism is located in the square hole, and the rotating shaft of the rotating mechanism is fixedly connected to the connecting mechanism so as to drive the telescopic piston rod to rotate through the connecting mechanism.

2. The extension-swing compound motion cylinder according to claim 1, characterized in that: The body comprises: a front end cover, a telescopic cylinder body, a rear end cover, a rotating cylinder body and a rotating cylinder cover which are connected in sequence; The front end cover has a piston rod hole for installing a telescopic piston rod; the front end cover is provided with a retractable air inlet channel; The telescopic cylinder is used to accommodate the telescopic mechanism; The front cover and the rear cover are provided with guide rod mounting holes for mounting the guide rods; the rear cover is provided with an extended air inlet passage; The rotating cylinder is used to accommodate the rotating mechanism; The rotating cylinder cover is provided with a left-handed air intake passage and a right-handed air intake passage.

3. The extension-swing compound motion cylinder according to claim 2, characterized in that: A shaft sleeve is provided between the telescopic piston rod of the telescopic mechanism and the piston rod hole of the front end cover; a first sealing member is provided between the front end cover and the telescopic piston rod, and a second sealing member is provided between the rear end cover and the telescopic piston rod.

4. The extension-swing compound motion cylinder according to claim 1, characterized in that: The connecting mechanism has a square shape that matches the square hole. The connecting mechanism is provided with a connecting hole, and is interference-connected with the rotating shaft through the connecting hole. At least one annular groove is provided on the connecting structure.

5. The extension-swing compound motion cylinder according to claim 1, characterized in that: The material of the connecting mechanism is different from that of the piston rod, and is also different from that of the rotating shaft of the rotating mechanism.

6. The extension-swing compound motion cylinder according to claim 1, characterized in that: The connecting mechanism is made of copper alloy.

7. The extension-swing compound motion cylinder according to claim 1, characterized in that: The rotating mechanism comprises a swinging body and a rotating shaft; The swing body is arranged in the rotating cylinder body, and the rotating shaft is fixedly connected to the swing body so as to swing along with the swing body.

8. The extension-swing compound motion cylinder according to claim 1, characterized in that: Also included are limit pins; A limiting slide groove is provided on the rear end cover of the body; A connecting block is provided between the rear end cover and the rotating mechanism; One end of the limiting pin is installed on the connecting block, and the other end is located in the limiting sliding groove to limit the swing angle of the rotating mechanism.

9. The extension-swing compound motion cylinder according to claim 1, characterized in that: Also includes: An axial positioning block is arranged between the rotating mechanism and the rear end cover of the body, so that the swing body of the rotating mechanism keeps a coaxial state with the rotating axis of the body and the telescopic mechanism.

10. The extension-swing compound motion cylinder according to claim 1, characterized in that: Also includes: Fixed pin; A pin through hole is provided on the swinging body and the rotating cylinder cover of the rotating mechanism, and a pin connecting hole is provided on the rear end cover. The fixed pin passes through the pin through hole and is connected to the pin connecting hole.

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