Electric cylinder with built-in floating joint
By incorporating a floating joint electric cylinder into the piston rod, the problems of increased push rod length and insufficient angle caused by the later addition of the floating joint are solved, resulting in a compact structure and increased correction angle, thus broadening the application scenarios.
Patent Information
- Application Number
- CN202520161061.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-01-23
AI Technical Summary
The floating joint on the existing electric cylinder was added later, which increased the length of the push rod and limited the correction angle, thus failing to meet the actual production needs.
Design an electric cylinder with built-in floating joint. By opening a rotating cavity on the piston rod, the ball head and swing section are directly built into the piston rod. The pressure ring is used to achieve detachable installation, thereby increasing the swing angle of the floating joint.
It enables direct integration of floating joints, saving installation time, has a compact structure, increases the correction angle, and broadens application scenarios.
Smart Images
Figure CN223613161U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electric cylinder technical field, specifically, it relates to a built-in floating joint electric cylinder. BACKGROUND
[0002] The electric cylinder is a kind of electric power drive device that the rotary motion of motor is changed into the linear reciprocating motion of push rod, it is driven by motor, realizes accurate position control and strength output, is widely used in automation production line, robot, medical equipment and other fields.
[0003] In order to solve the problem that eccentric angle exists between electric cylinder push rod and driven body, the existing electric cylinder is provided with floating joint on its push rod to eliminate displacement error between push rod and driven body, reaches the effect of vibration reduction and improves shaft dynamic performance, ensures the stable operation of equipment.But nowadays floating joint on electric cylinder is all extra installed in later period, and the floating joint installed in later period can cause the length of original push rod to increase significantly, and the angle that can be rotated to correct deviation by conventional floating joint is smaller, and it is only about 5 °, cannot satisfy actual production demand. UTILITY MODEL CONTENTS
[0004] In view of the deficiency of prior art, the application provides a built-in floating joint electric cylinder.
[0005] The built-in floating joint electric cylinder disclosed by the application includes a driving member, a cylinder barrel, a lead screw, a nut, a piston rod and a floating joint, the driving member is arranged at one end of the cylinder barrel, the lead screw is arranged in the cylinder barrel and connected with the driving end of the driving member, the nut is sleeved outside the lead screw, the piston rod is sleeved outside the lead screw, one end of the piston rod is connected with the nut, the other end of the piston rod extends outward after passing through the cylinder barrel, the floating joint includes a ball head, a swing section and a connecting part, the other end of the piston rod is provided with a rotating cavity matched with the ball head, the ball head is rotatably arranged in the rotating cavity, and part of the ball head is exposed outside the rotating cavity through the opening of the rotating cavity, one end of the swing section is connected with the exposed part of the ball head, the other end of the swing section extends away from the piston rod, the connecting part is connected to the other end of the swing section, and the diameter of the opening of the rotating cavity is smaller than the diameter of the ball head.
[0006] Preferably, the matching gap between the ball head and the inner wall of the rotating cavity is 0.02mm-0.04mm.
[0007] Preferably, the built-in floating joint electric cylinder further includes a compression ring, the other end of the piston rod is provided with a rotating groove, the compression ring is detachably installed in the rotating groove and cooperates with the rotating groove to form the rotating cavity, and the compression ring is sleeved outside the ball head and limits the ball head in the rotating cavity.
[0008] Preferably, the outer ring of the compression ring is provided with a first thread, the inner wall of the rotating groove is provided with a second thread, and the compression ring is detachably installed in the rotating groove through cooperation of the first thread and the second thread.
[0009] Preferably, the compression ring comprises a fixed ring and two semicircular compression rings, the two semicircular compression rings can be connected end to end to form a circular compression ring, the circular compression ring is sleeved outside the ball head and cooperates with the rotating groove to form a rotating cavity, the outer ring of the fixed ring is provided with a first thread, the fixed ring is sleeved outside the circular compression ring, and the fixed ring is detachably installed in the rotating groove through cooperation of the first thread and the second thread and limits the circular compression ring between the fixed ring and the ball head.
[0010] Preferably, the outer wall of the circular compression ring is provided with an annular inclined surface, and when the fixed ring is sleeved outside the annular inclined surface, the fixed ring fixes the two semicircular compression rings into the circular compression ring.
[0011] Preferably, the compression ring comprises two semicircular ball head compression rings, one of the two semicircular ball head compression rings is provided with a protrusion, the other of the two semicircular ball head compression rings is provided with a groove matched with the protrusion, the two semicircular ball head compression rings are connected through cooperation of the protrusion and the groove to form a spherical compression ring, the outer ring of the spherical compression ring is provided with a first thread, and the spherical compression ring is detachably installed in the rotating groove through cooperation of the first thread and the second thread and cooperates with the rotating groove to form a rotating cavity, the spherical compression ring is sleeved outside the ball head and limits the ball head in the rotating cavity.
[0012] Preferably, the ball head, the swing section and the connecting part are integrally formed.
[0013] Preferably, the connecting part is a flange.
[0014] Preferably, the surface of the connecting part is provided with a circular-arc-shaped protrusion.
[0015] The application has the beneficial effects that: a rotating cavity matched with the ball head is formed at the other end of the piston rod, the ball head is rotatably arranged in the rotating cavity, the floating joint is directly arranged on the piston rod, the floating joint does not need to be additionally arranged on the piston rod in the later stage, the installation time is saved, the structure is more compact, the convenience of use is improved, the other end of the swing section and the connecting part can swing in a large range relative to the other end of the piston rod because part of the ball head is exposed outside the rotating cavity and the other end of the swing section is connected with the ball head exposed outside, the angle of swing and correction of the floating joint is increased relative to the traditional floating joint arranged in the later stage, and the application scenarios are widened. BRIEF DESCRIPTION OF DRAWINGS
[0016] The drawings described herein are used to provide further understanding of the application, constitute a part of the application, and the illustrative embodiments of the application and the description thereof are used to explain the application, and do not constitute improper limitations on the application. In the drawings:
[0017] Figure 1A sectional view of the built-in floating joint electric cylinder in Example One;
[0018] Figure 2 A sectional view of the built-in floating joint electric cylinder in Example One; Figure 1 An enlarged view of Part A in Example One;
[0019] Figure 3 A sectional view of the built-in floating joint electric cylinder in Example One after the floating joint is disassembled;
[0020] Figure 4 Another sectional view of the built-in floating joint electric cylinder in Example One after the floating joint is disassembled;
[0021] Figure 5 A structural schematic view of the half-circle compression ring in Example One;
[0022] Figure 6 A sectional view of the half-circle compression ring in Example One;
[0023] Figure 7 A structural schematic view of the built-in floating joint electric cylinder in Example Two;
[0024] Figure 8 A sectional view of the ball-head half-circle compression ring in Example Two.
[0025] Reference signs:
[0026] 1, driving member; 11, driver; 12, synchronous wheel; 13, bearing seat; 14, bearing; 2, cylinder; 3, screw rod; 4, nut; 5, piston rod; 51, rotating cavity; 6, floating joint; 61, ball head; 62, swing section; 63, connecting part; 631, circular-arc protrusion; 7, compression ring member; 71, fixed ring; 72, half-circle compression ring; 721, annular inclined surface; 73, ball-head half-circle compression ring; 731, protrusion; 732, groove. DETAILED DESCRIPTION
[0027] The embodiments of the present application will be described herein below with reference to the drawings. In order to clearly illustrate the present application, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the present application. That is, in some embodiments of the present application, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be shown in the drawings in a simple schematic manner.
[0028] It should be noted that all directional references, such as upper, lower, left, right, front, rear, etc., are in relation to the specific embodiment shown in the drawings and are used only to illustrate the present application. If the specific orientation of the embodiment is changed, the directional references will also be changed accordingly.
[0029] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and is not intended to particularly indicate the order or sequence, nor to limit the present application, which is merely to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of a person skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.
[0030] In order to further understand the application content, characteristics and effects of the present application, the following examples are given, and are described in detail as follows with reference to the accompanying drawings.
[0031] Example one:
[0032] Referring to Figures 1-4 , Figure 1 is a sectional view of the built-in floating joint electric cylinder in example one, Figure 2 is Figure 1 an enlarged view of part A, Figure 3 is a sectional view of the built-in floating joint electric cylinder after disassembling the floating joint in example one, Figure 4 is another sectional view of the built-in floating joint electric cylinder after disassembling the floating joint in example one, the built-in floating joint electric cylinder in the embodiment includes a driving member 1, a cylinder barrel 2, a lead screw 3, a nut 4, a piston rod 5 and a floating joint 6, the driving member 1 is arranged at one end of the cylinder barrel 2, the lead screw 3 is arranged in the cylinder barrel 2 and connected with the driving end of the driving member 1, the nut 4 is sleeved outside the lead screw 3, the piston rod 5 is sleeved outside the lead screw 3, one end of the piston rod 5 is connected with the nut 4, the other end of the piston rod 5 extends out of the cylinder barrel 2 and extends towards the outside, the floating joint 6 includes a ball head 61, a swing section 62 and a connecting part 63, the other end of the piston rod 5 is provided with a rotating cavity 51 matched with the ball head 61, the ball head 61 is rotatably arranged in the rotating cavity 51, and part of the ball head 61 is exposed outside the rotating cavity 51 through the opening of the rotating cavity 51, one end of the swing section 62 is connected with the exposed part of the ball head 61, the other end of the swing section 62 extends away from the piston rod 5, the connecting part 63 is connected to the other end of the swing section 62, and the diameter of the opening of the rotating cavity 51 is smaller than the diameter of the ball head 61.
[0033] By opening a rotating cavity 51 matched with the ball head 61 at the other end of the piston rod 5, the ball head 61 can be rotated and arranged in the rotating cavity 51, so as to realize that the floating joint is directly built-in on the piston rod 5, without the need of additionally installing the floating joint on the piston rod 5 later, saving the installation time, the structure is more compact, and the convenience of use is improved. At the same time, since part of the ball head 61 is exposed outside the rotating cavity 51, and one end of the swing section 62 is connected with the exposed part of the ball head 61, the other end of the swing section 62 and the connecting part 63 can swing in a larger range relative to the other end of the piston rod 5. Compared with the traditional floating joint installed later, the angle of swing and correction is increased, and the application scene is widened.
[0034] With reference back to Figure 1 Preferably, the driving member 1 comprises a driver 11, two synchronous wheels 12 and a synchronous belt. The driver 11 comprises a driving motor and a speed reducer. The motor shaft of the driving motor is in transmission connection with the speed reducer. The output shaft of the speed reducer is arranged in one of the synchronous wheels 12. One end of the lead screw 3 is rotatably arranged in the cylinder barrel 5. The other end of the lead screw 3 away from the piston rod 5 is arranged in the other synchronous wheel 12. The synchronous belt is sequentially arranged outside the two synchronous wheels 12. In specific application, the driving motor drives one of the synchronous wheels 12 to rotate through the speed reducer. The rotation of one of the synchronous wheels 12 drives the synchronous belt to rotate. The rotation of the synchronous belt drives the other synchronous wheel 12 to rotate. The rotation of the other synchronous wheel 12 drives the lead screw 3 to rotate. The rotation of the lead screw 3 drives the nut 4 to move linearly on the lead screw 3. The linear movement of the nut 4 drives the piston rod 5 to move linearly synchronously. The driving end of the driving member 1 in the present application refers to the other synchronous wheel 12, which drives the lead screw 3 to rotate through the rotation of the other synchronous wheel 12. Specifically, the driving member 1 further comprises a bearing seat 13 and a bearing 14. The bearing 14 is sleeved outside the lead screw 3. The bearing seat 13 is sleeved outside the bearing 14. It can be understood that the part of the lead screw 3 outside the bearing 14 and the synchronous wheel 12 in the present embodiment is not threaded, while the outer wall of the part close to the piston rod 5 is threaded, which is used for cooperating with the nut 4 to realize the linear movement of the nut 4.
[0035] With reference back to Figure 1, preferably, the fitting gap between the ball head 61 and the inner wall of the rotating cavity 51 is 0.02mm~0.04mm. In specific application, the fitting gap between the ball head 61 and the inner wall of the rotating cavity 51 in this embodiment is 0.03mm, which can ensure the ball head 61 has a certain degree of rotational freedom in the rotating cavity 51, avoid the ball head 61 from being stuck in the rotating cavity 51, and avoid the ball head 61 from being deviated in the radial direction due to the too large fitting gap. Specifically, most of the ball head 61 is located in the rotating cavity 51, and a small part of the ball head 61 is exposed outside the opening of the rotating cavity 51, that is, exposed outside the other end of the piston rod 5. Since the diameter of the opening of the rotating cavity 51 is smaller than the diameter of the ball head 61, the ball head 61 is ensured to be built-in in the rotating cavity 51, avoiding the ball head 61 from being separated from the other end of the piston rod 5, and improving the stability. The diameter of the cross section of the swing section 62 is smaller than the diameter of the opening of the rotating cavity 51.
[0036] Referring to Figure 5 and Figure 6 , Figure 5 is a structure diagram of the half-circle pressure ring in embodiment one, Figure 6 is a sectional view of the half-circle pressure ring in embodiment one, preferably, the built-in floating joint electric cylinder further comprises a pressure ring piece 7, the other end of the piston rod 5 is provided with a rotating groove, the pressure ring piece 7 is detachably installed in the rotating groove and cooperates with the rotating groove to form the rotating cavity 51, and the pressure ring piece 7 is sleeved outside the ball head 61 and limits and presses the ball head 61 in the rotating cavity 51. In specific application, the groove bottom of the rotating groove in this embodiment is a spherical groove matched with the ball head 61, the diameter of the groove opening of the rotating groove is larger than the diameter of the ball head 61, the inner wall of the pressure ring piece 7 is a spherical surface matched with the ball head 61, so that when the pressure ring piece 7 is installed in the rotating groove, the rotating groove cooperates with the inner wall of the pressure ring piece 7 to form the rotating cavity 51, and at this time, the center hole of the pressure ring piece 7 is the opening of the rotating cavity 51. At the same time, since the ball head 61 cannot pass through the opening of the rotating cavity 51, the ball head 61 can be detached from the other end of the piston rod 5 together with the pressure ring piece 7 by detaching and separating the pressure ring piece 7 from the rotating groove, which is convenient for disassembling, maintaining or replacing the floating ball head 6. Specifically, the outer ring of the pressure ring piece 7 is provided with a first thread, the inner wall of the rotating groove is provided with a second thread, and the pressure ring piece 7 is detachably installed in the rotating groove through the cooperation of the first thread and the second thread. The pressure ring piece 7 can be detached from the rotating groove by rotating the pressure ring piece 7.
[0037] Referring to Figure 5 and Figure 6Preferably, the pressure ring 7 comprises a fixed ring 71 and two semicircular pressure rings 72 which can be connected end to end to form a circular pressure ring, the circular pressure ring is sleeved outside the ball head 61 and cooperates with the rotating groove to form the rotating cavity 51, the outer ring of the fixed ring 71 is provided with a first screw thread, the fixed ring 71 is sleeved outside the circular pressure ring, and the fixed ring 71 is detachably installed in the rotating groove through cooperation of the first screw thread and a second screw thread, and the circular pressure ring is limited and pressed between the fixed ring 71 and the ball head 61. In specific application, the diameter of the center hole of the fixed ring 71 is greater than the diameter of the ball head 61. In the embodiment, since the diameter of the center hole of the pressure ring 7 is smaller than the diameter of the ball head 61, the pressure ring 7 cannot be directly sleeved outside the ball head 61. Through the arrangement of the two semicircular pressure rings 72, the fixed ring 71 can be first sleeved outside the ball head 61 and placed in the rotating groove, and then the two separated semicircular pressure rings 72 are sleeved outside the swing section 62 and connected end to end to form a circular pressure ring, the fixed ring 71 is sleeved outside the circular pressure ring to fix the two semicircular pressure rings 72, and finally the fixed ring 71 and the circular pressure ring are rotated to screw the first screw thread and the second screw thread. At this time, the fixed ring 71 is fixedly installed in the rotating groove, and the circular pressure ring is limited and pressed between the fixed ring 71 and the ball head 61. The inner wall of the circular pressure ring is a spherical surface matched with the ball head 61, which cooperates with the rotating groove to form the rotating cavity 51. If the floating ball head 6 needs to be disassembled, only the fixed ring 71 needs to be rotated to be separated from the rotating groove, and then the fixed ring 71 is separated from the circular pressure ring, and the two semicircular pressure rings 72 can be separated and taken out. The fixed ring 71 can pass through the ball head 61 to separate from the floating ball head 6, so that the floating ball head 6 can be disassembled, and the fixed ring 71 and the two semicircular pressure rings 72 can be separated one by one. Specifically, the outer wall of the circular pressure ring is provided with an annular inclined surface 721, and when the fixed ring 71 is sleeved outside the annular inclined surface 721, the fixed ring 71 fixes the two semicircular pressure rings 72 into a circular pressure ring. Through the arrangement of the annular inclined surface 721, the shape of the inner wall of the fixed ring 71 is matched with the annular inclined surface 721, which further improves the stability of the fixed ring 71 when fixing the two semicircular pressure rings 72 into a circular pressure ring. The end face of the fixed ring 71 is provided with a twisting hole for inserting a twisting tool to facilitate twisting the fixed ring 71.
[0038] Preferably, the ball head 61, the swing section 62 and the connecting part 63 are integrally formed. In specific application, the integrally formed structure of the floating ball head 6 can improve the strength of the overall structure and ensure the stability of the connecting part 63 when connected with the external driven body. Specifically, in the embodiment, the connecting part 63 is a flange for connecting with the external driven body.
[0039] Embodiment two:
[0040] Referring to Figure 7 and Figure 8 , Figure 7Structure diagram of the built-in floating joint electric cylinder in Example Two, Figure 8 The cross-sectional view of the spherical head semi-circular pressure ring in Example Two, the built-in floating joint electric cylinder in this embodiment is different from that in Example One in that the pressure ring piece 7 in this embodiment includes two spherical head semi-circular pressure rings 73, one of which is provided with a protrusion 731, and the other of which is provided with a groove 732 matched with the protrusion 731, the two spherical head semi-circular pressure rings 73 are matched to form a spherical pressure ring through the protrusion 731 and the groove 732, the outer ring of the spherical pressure ring is provided with a first thread, and the spherical pressure ring is detachably installed in the rotating groove and cooperates with the rotating groove to form a rotating cavity 51 through the cooperation of the first thread and the second thread, and the spherical pressure ring is sleeved on the spherical head 61 and limits the spherical head 61 in the rotating cavity 51. It can be understood that the pressure ring piece 7 in this embodiment only includes two components: two spherical head semi-circular pressure rings 73, and the two spherical head semi-circular pressure rings 73 in this embodiment are connected and fixed to form a spherical pressure ring through the protrusion 731 and the groove 732, wherein the inner wall of the spherical pressure ring is a spherical surface matched with the spherical head 61, the spherical pressure ring cooperates with the rotating groove to form a rotating cavity 51, and the central hole of the spherical pressure ring is the opening of the rotating cavity 51. Compared with Example One, the number of components is further reduced and the structure is simplified. During installation, only the two spherical head semi-circular pressure rings 73 need to be sleeved on the swing section 62 and matched to form a spherical pressure ring through the protrusion 731 and the groove 732, and then screwed and fixed in the rotating groove through the cooperation of the first thread and the second thread. Specifically, the connecting part 63 in this embodiment is not a flange, and the connecting part 63 in this embodiment is a support block, the surface of which is provided with a circular-arc protrusion 631. It can be understood that through the provision of the circular-arc protrusion 631, the built-in floating joint electric cylinder in this embodiment can be used as a support leg cylinder, and the circular-arc protrusion 631 is used to adjust the central stress point of the support leg cylinder, thereby widening the application scenarios of this embodiment.
[0041] In summary, by opening the rotating cavity 51 matched with the spherical head 61 at the other end of the piston rod 5, the spherical head 61 can be rotated and arranged in the rotating cavity 51, so as to realize the direct built-in of the floating joint on the piston rod 5, without the need for additional installation of the floating joint on the piston rod 5 later, saving installation time, making the structure more compact, and improving the convenience of use. At the same time, since part of the spherical head 61 is exposed outside the rotating cavity 51, and one end of the swing section 62 is connected with the exposed part of the spherical head 61, the other end of the swing section 62 and the connecting part 63 can swing a larger amplitude relative to the other end of the piston rod 5. Compared with the traditional floating joint installed later, the angle of swing and correction is increased, and the application scenarios are widened.
[0042] The above merely provides an embodiment of the present application, but not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of claims of the present application.
Claims
1. An electric cylinder with built-in floating joint, characterized by, The utility model relates to a piston rod floating joint, including: Drive piece (1), cylinder barrel (2), screw rod (3), nut (4), piston rod (5) and floating joint (6), drive piece (1) is located one end of cylinder barrel (2), screw rod (3) is located in cylinder barrel (2) and is connected with the drive end of drive piece (1), nut (4) is set up in the screw rod (3) outside, piston rod (5) is set up in the screw rod (3) outside, and one end of piston rod (5) is connected with nut (4), the other end of piston rod (5) is extended to the outside after going out cylinder barrel (2), floating joint (6) includes ball head (61), swing section (62) and connecting portion (63), the other end of piston rod (5) is provided with the rotation cavity (51) of being adapted with ball head (61), ball head (61) is rotatably arranged in rotation cavity (51), and part ball head (61) is exposed outside rotation cavity (51) through the opening of rotation cavity (51), one end of swing section (62) is connected with exposed part ball head (61), the other end of swing section (62) extends to the direction away from piston rod (5), connecting portion (63) is connected to the other end of swing section (62), the diameter of rotation cavity (51) opening is less than the diameter of ball head (61).
2. The built-in floating joint electrodynamic cylinder according to claim 1, characterized in that The cooperation gap between the ball head (61) and the inner wall of the rotation cavity (51) is 0.02mm~0.04mm.
3. The built-in floating joint electrodynamic cylinder according to claim 1, characterized in that It further includes a compression ring (7), the other end of the piston rod (5) is provided with a rotation groove, the compression ring (7) can be detachably installed in the rotation groove and cooperated with the rotation groove to form the rotation cavity (51), the compression ring (7) is sleeved outside the ball head (61) and is limited to press the ball head (61) in the rotation cavity (51).
4. The built-in floating joint electrodynamic cylinder according to claim 3, characterized in that The outer ring of the compression ring (7) is provided with a first thread, and the inner wall of the rotation groove is provided with a second thread. The compression ring (7) is detachably installed in the rotation groove through the cooperation of the first thread and the second thread.
5. The built-in floating joint electrodynamic cylinder according to claim 4, characterized in that The compression ring (7) includes a fixed ring (71) and two semicircular compression rings (72). The two semicircular compression rings (72) can be connected end to end to form a circular compression ring. The circular compression ring is sleeved outside the ball head (61) and cooperated with the rotation groove to form the rotation cavity (51). The outer ring of the fixed ring (71) is provided with a first thread. The fixed ring (71) is sleeved outside the circular compression ring and detachably installed in the rotation groove through the cooperation of the first thread and the second thread. The circular compression ring is limited between the fixed ring (71) and the ball head (61).
6. The built-in floating joint electrodynamic cylinder according to claim 5, characterized in that The outer wall of the circular compression ring is provided with an annular inclined surface (721). When the fixed ring (71) is sleeved outside the annular inclined surface (721), the fixed ring (71) fixes the two semicircular compression rings (72) as the circular compression ring.
7. The built-in floating joint electrodynamic cylinder according to claim 4, characterized in that The compression ring piece (7) comprises two ball head semi-circular compression rings (73), one of which is provided with a protrusion (731), and the other is provided with a groove (732) matched with the protrusion (731), and the two ball head semi-circular compression rings (73) form a spherical compression ring through the cooperation of the protrusion (731) and the groove (732), the outer ring of the spherical compression ring is provided with a first thread, and the spherical compression ring is detachably installed in the rotating groove and cooperates with the rotating groove to form the rotating cavity (51) through the cooperation of the first thread and the second thread, and the spherical compression ring is sleeved outside the ball head (61) and limits and compresses the ball head (61) in the rotating cavity (51).
8. The built-in floating joint electrodynamic cylinder according to claim 1, characterized in that The ball head (61), the swing section (62) and the connecting part (63) are integrally formed.
9. The built-in floating joint electrodynamic cylinder according to claim 1, characterized in that The connecting part (63) is a flange.
10. The built-in floating joint electrodynamic cylinder according to claim 1, characterized in that The connecting part (63) is provided with a circular-arc-shaped protrusion (631) on the surface.