Output shaft and servo electric cylinder

Abstract

According to the output shaft and the servo electric cylinder, a first permanent magnet and a second permanent magnet are arranged between a first connecting part and a second connecting part of the output shaft, and the first connecting part and the second connecting part are detachably connected through magnetic force between the first permanent magnet and the second permanent magnet; a third permanent magnet and a fourth permanent magnet are arranged between a second connecting part and a third connecting part of the output shaft, and the second connecting part and the third connecting part are detachably connected through magnetic force between the third permanent magnet and the second permanent magnet; impact on other parts in the electric cylinder when the output shaft is stressed excessively can be reduced, and the effect of protecting the whole electric cylinder is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of electric cylinders, and in particular to an output shaft and a servo electric cylinder. Background Art

[0002] At present, electric cylinders have been widely used in various fields. The common form of electric cylinders includes a motor, a screw nut mechanism and an output shaft connected in sequence; electric cylinders are usually used to achieve precise linear motion. In the electric cylinder, the motor provides power, and the screw nut mechanism transmits the power to the output shaft, so that the output shaft can achieve linear motion.

[0003] In actual use, the structural strength of the output shaft is relatively high. When the output shaft is overloaded, although the high-strength output shaft is not easy to break, it is easy to damage the motor and other parts such as the screw nut mechanism inside the electric cylinder, thereby causing damage to the electric cylinder. Summary of the invention

[0004] In order to solve the above problems, the purpose of the embodiments of the present application is to provide an output shaft and a servo cylinder.

[0005] In a first aspect, an embodiment of the present application provides an output shaft, comprising: an output shaft body, a first permanent magnet, a second permanent magnet, a third permanent magnet, and a fourth permanent magnet;

[0006] The output shaft body comprises: a first connecting portion, a second connecting portion and a third connecting portion;

[0007] The first permanent magnet is fixed to one end of the first connection part close to the second connection part, and the second permanent magnet is fixed to one end of the second connection part close to the first connection part, and the first permanent magnet and the second permanent magnet are arranged opposite to each other after being fixed;

[0008] The third permanent magnet is fixed to one end of the second connection part close to the third connection part, and the fourth permanent magnet is fixed to one end of the third connection part close to the second permanent magnet;

[0009] The first connecting portion and the second connecting portion are detachably connected via the magnetic force between the first permanent magnet and the second permanent magnet;

[0010] The second connecting portion and the third connecting portion are detachably connected via the magnetic force between the third permanent magnet and the second permanent magnet;

[0011] When the separation force between the first permanent magnet and the second permanent magnet is greater than the magnetic force between the first permanent magnet and the second permanent magnet, the first permanent magnet is separated from the second permanent magnet, so that the first connecting portion is disconnected from the second connecting portion;

[0012] When the separation force between the third permanent magnet and the fourth permanent magnet is greater than the magnetic force between the third permanent magnet and the fourth permanent magnet, the third permanent magnet is separated from the fourth permanent magnet, so that the second connection part is disconnected from the third connection part.

[0013] In a second aspect, an embodiment of the present application further provides a servo electric cylinder, comprising: a mounting housing, and a gear transmission mechanism, a thrust screw, a nut, a thrust bearing, and the output shaft described in the first aspect arranged in the mounting housing;

[0014] The installation housing comprises: an output shaft end cover, a first installation housing, a second installation housing and a cover body which are fixedly connected in sequence;

[0015] The driver is arranged in the accommodation space formed by the first installation shell and the second installation shell;

[0016] The nut is sleeved on the thrust screw and is threadedly connected with the thrust screw;

[0017] The gear transmission mechanism is arranged in the accommodating space and is fixed to the driver and the thrust screw respectively;

[0018] The thrust screw is also rotatably mounted in the accommodation space via the thrust bearing, and the driver drives the thrust screw to rotate via the gear transmission mechanism;

[0019] An accommodating hole is formed in one end of the first connecting portion away from the second connecting portion;

[0020] One end of the first connection portion having the receiving hole is sleeved on the thrust screw, and the third connection portion passes through the bottom of the output shaft end cover and is exposed outside the output shaft end cover;

[0021] One end of the output shaft body having the receiving hole is fixedly connected to the end surface of the nut, and the nut carries the output shaft body to perform linear motion.

[0022] In the solutions provided in the first aspect to the second aspect of the embodiments of the present application, a first permanent magnet and a second permanent magnet are arranged between the first connecting portion and the second connecting portion of the output shaft, and the first connecting portion and the second connecting portion are detachably connected through the magnetic force between the first permanent magnet and the second permanent magnet; and a third permanent magnet and a fourth permanent magnet are arranged between the second connecting portion and the third connecting portion of the output shaft, and the second connecting portion and the third connecting portion are detachably connected through the magnetic force between the third permanent magnet and the second permanent magnet; when the separation force between the first permanent magnet and the second permanent magnet is greater than the separation force between the first permanent magnet and the second permanent magnet, the first permanent magnet and the second permanent magnet are detachably connected. When the magnetic force between the third permanent magnet and the fourth permanent magnet is greater than the magnetic force between the third permanent magnet and the fourth permanent magnet, the first permanent magnet is separated from the second permanent magnet, so that the first connecting part is disconnected from the second connecting part; when the separation force between the third permanent magnet and the fourth permanent magnet is greater than the magnetic force between the third permanent magnet and the fourth permanent magnet, the third permanent magnet is separated from the fourth permanent magnet, so that the second connecting part is disconnected from the third connecting part; the impact of excessive force on other parts in the electric cylinder when the output shaft is subjected to the electric cylinder can be reduced, thereby protecting the entire electric cylinder; moreover, after the output shaft is disconnected, the multiple connecting parts connected by the permanent magnets can be reused repeatedly, thereby improving the utilization rate of the output shaft.

[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 An exploded schematic diagram of an output shaft provided in an embodiment of the present application is shown;

[0026] Figure 2 A cross-sectional schematic diagram of an output shaft provided in an embodiment of the present application is shown;

[0027] Figure 3 A schematic diagram of the three-dimensional structure of the output shaft provided in an embodiment of the present application is shown;

[0028] Figure 4 A schematic diagram of the three-dimensional structure of the third permanent magnet provided in the embodiment of the present application is shown;

[0029] Figure 5 A schematic diagram of the structure of an output shaft with a spring and a limiting ball provided in an embodiment of the present application is shown;

[0030] Figure 6A schematic cross-sectional structure diagram of a servo electric cylinder provided in an embodiment of the present application is shown;

[0031] Figure 7 An exploded schematic diagram of the servo electric cylinder provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection 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 this application can be understood according to specific circumstances.

[0035] At present, electric cylinders have been widely used in various fields. The common form of electric cylinders includes a motor, a screw nut mechanism and an output shaft connected in sequence; electric cylinders are usually used to achieve precise linear motion. In the electric cylinder, the motor provides power, and the screw nut mechanism transmits the power to the output shaft, so that the output shaft can achieve linear motion.

[0036] In actual use, the structural strength of the output shaft is relatively high. When the output shaft is overloaded, although the high-strength output shaft is not easy to break, it is easy to damage the motor and other parts such as the screw nut mechanism inside the electric cylinder, thereby causing damage to the electric cylinder.

[0037] Based on this, the following embodiments of the present application propose an output shaft and a servo electric cylinder, wherein a first permanent magnet and a second permanent magnet are arranged between a first connecting portion and a second connecting portion of the output shaft, and the first connecting portion and the second connecting portion are detachably connected through the magnetic force between the first permanent magnet and the second permanent magnet; and a third permanent magnet and a fourth permanent magnet are arranged between the second connecting portion and the third connecting portion of the output shaft, and the second connecting portion and the third connecting portion are detachably connected through the magnetic force between the third permanent magnet and the second permanent magnet; when the separation force between the first permanent magnet and the second permanent magnet is greater than the separation force between the first permanent magnet and the second permanent magnet, When the magnetic force between the first permanent magnet and the second permanent magnet is greater than the magnetic force between the third permanent magnet and the fourth permanent magnet, the third permanent magnet is separated from the fourth permanent magnet, so that the second connecting part is disconnected from the third connecting part; when the separation force between the third permanent magnet and the fourth permanent magnet is greater than the magnetic force between the third permanent magnet and the fourth permanent magnet, the third permanent magnet is separated from the fourth permanent magnet, so that the second connecting part is disconnected from the third connecting part; the impact of excessive force on other parts in the electric cylinder can be reduced, thereby protecting the entire electric cylinder; moreover, after the output shaft is disconnected, the multiple connecting parts connected by the permanent magnets can be reused repeatedly, thereby improving the utilization rate of the output shaft.

[0038] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0039] Example

[0040] See also Figure 1 Exploded view of the output shaft shown, see Figure 2 The cross-sectional view of the output shaft shown in FIG. Figure 3 As shown in the three-dimensional structural diagram of the output shaft, this embodiment proposes an output shaft, including: an output shaft body 1, a first permanent magnet 3, a second permanent magnet 5, a third permanent magnet 8 and a fourth permanent magnet 9.

[0041] The output shaft body 1 includes a first connection portion 101 , a second connection portion 102 and a third connection portion 103 .

[0042] The first permanent magnet 3 is fixed to one end of the first connection part 101 close to the second connection part 102 , and the second permanent magnet 5 is fixed to one end of the second connection part 102 close to the first connection part 101 . After being fixed, the first permanent magnet 3 and the second permanent magnet 5 are arranged opposite to each other.

[0043] The third permanent magnet 8 is fixed to one end of the second connection portion 102 close to the third connection portion 103 , and the fourth permanent magnet 9 is fixed to one end of the third connection portion 103 close to the second connection portion 102 .

[0044] The first connection portion 101 and the second connection portion 102 are detachably connected via the magnetic force between the first permanent magnet 3 and the second permanent magnet 5 .

[0045] The second connection portion 102 and the third connection portion 103 are detachably connected via the magnetic force between the third permanent magnet 8 and the second permanent magnet 9 .

[0046] When the separation force between the first permanent magnet 3 and the second permanent magnet 5 is greater than the magnetic force between the first permanent magnet 3 and the second permanent magnet 5 , the first permanent magnet 3 is separated from the second permanent magnet 5 , so that the first connecting portion 101 is disconnected from the second connecting portion 102 .

[0047] When the separation force between the third permanent magnet 8 and the fourth permanent magnet 9 is greater than the magnetic force between the third permanent magnet 8 and the fourth permanent magnet 9, the third permanent magnet 8 is separated from the fourth permanent magnet 9, so that the second connecting portion 102 is disconnected from the third connecting portion 103.

[0048] Here, the above separation force can be divided into: the separation force between the first connection part 101 and the second connection part 102 is a pressure; and the separation force between the second connection part 102 and the third connection part 103 is a tension.

[0049] The first connection part 101 and the second connection part 102 are disconnected because the pressure on the output shaft is too large, that is, at this time, the pressure between the first permanent magnet 3 and the second permanent magnet 5 is greater than the magnetic force between the first permanent magnet 3 and the second permanent magnet 5 .

[0050] The second connection part 102 is disconnected from the third connection part 103 because the pulling force on the output shaft is too large, that is, the pulling force between the third permanent magnet 8 and the fourth permanent magnet 9 is greater than the magnetic force between the third permanent magnet 8 and the fourth permanent magnet 9 .

[0051] In order to fix the first permanent magnet 3 on the first connecting portion 101 and the second permanent magnet 5 on the second connecting portion 102 , the output shaft provided in this embodiment further includes: a first mounting groove 2 and a second mounting groove 4 .

[0052] A first connection protrusion 1011 is disposed at one end of the first connection portion 101 close to the second connection portion 102 , and the first mounting groove 2 is fixed on the first connection protrusion 1011 . After being fixed, the opening of the first mounting groove 2 faces the first connection portion 101 .

[0053] A second connection protrusion 1021 is disposed at one end of the second connection portion 102 close to the first connection portion 101 , and the second installation groove 4 is fixed on the second connection protrusion 1021 . After being fixed, the opening of the second installation groove 4 faces the second connection portion 102 .

[0054] The first connecting protrusion 1011 is connected to the second connecting protrusion 1021 .

[0055] The first permanent magnet 3 is fixed in the first installation groove 2 , and the second permanent magnet 5 is fixed in the second installation groove 4 . The first permanent magnet 3 and the second permanent magnet 5 are connected by magnetic force.

[0056] Here, the first connecting protrusion 1011 and the second connecting protrusion 1021 are connected by the magnetic force generated between the first permanent magnet (3) and the second permanent magnet (5).

[0057] like Figure 1 and Figure 3 As shown, the number of the first connecting protrusions 1011 is two and they are symmetrically arranged about the axis of the first connecting part 101, the number of the second connecting protrusions 1021 is two and they are symmetrically arranged about the axis of the second connecting part 102, and the first connecting protrusions 1011 and the second connecting protrusions 1021 are both quarter-circular ring structures with the same radius. Firstly, the symmetrical structure design of the first connecting protrusion 1011 and the second connecting protrusion 1021 makes the force uniform, and the position change between the installation groove and the connecting protrusion is not easy to occur; secondly, after the first connecting part 101 is connected to the second connecting part 102, the first connecting protrusion 1011 and the second connecting protrusion 1021 can form a plug-in circular ring structure, which plays a positioning role in the installation of the first connecting part 101 and the second connecting part 102.

[0058] In order to fix the third permanent magnet 8 on the second connection part 102 and the fourth permanent magnet 9 on the third connection part 103 , the output shaft provided in this embodiment further includes: a first mounting ring 6 and a second mounting ring 7 .

[0059] A first connection boss 1022 is disposed at one end of the second connection portion 102 close to the third connection portion 103 , and a second connection boss 1031 is disposed at one end of the third connection portion 103 close to the second connection portion 102 .

[0060] The first mounting ring 6 is sleeved on the first connecting boss 1022 . The height of the first mounting ring 6 is higher than that of the first connecting boss 1022 . The first mounting ring 6 and the first connecting boss 1022 form a first permanent magnet accommodating cavity.

[0061] The second mounting ring 7 is mounted on the second connecting boss 1031, and the height of the second mounting ring 7 is higher than the height of the second connecting boss 1031. The second mounting ring 7 and the first connecting boss 1031 form a second permanent magnet accommodating cavity; wherein, the opening of the second permanent magnet accommodating cavity faces the first permanent magnet accommodating cavity, and the second permanent magnet accommodating cavity is arranged opposite to the first permanent magnet accommodating cavity.

[0062] The third permanent magnet 8 is fixed in the first permanent magnet accommodating cavity, and the fourth permanent magnet 9 is fixed in the second permanent magnet accommodating cavity.

[0063] The third permanent magnet 8 is connected to the fourth permanent magnet 9 through magnetic force.

[0064] like Figure 2 and Figure 3 As shown, when the first connecting part 101 is magnetically connected to the second connecting part 102, the opposite end surfaces of the first mounting groove 2 and the second mounting groove 4 will contact; when the second connecting part 102 is magnetically connected to the third connecting part 103, the opposite end surfaces of the first mounting ring 6 and the second mounting ring 7 will contact, and the first mounting groove 2, the second mounting groove 4, the first mounting ring 6 and the second mounting ring 7 are all made of magnetic shielding materials.

[0065] The magnetic shielding material includes, but is not limited to, Permalloy, silicon steel sheet (silicon steel sheet) and soft iron.

[0066] The first mounting groove 2, the second mounting groove 4, the first mounting ring 6 and the second mounting ring 7 are all made of magnetic shielding materials, which can prevent the magnetism of the permanent magnet from interfering with the outside world and also prevent external impurities from being adsorbed on the permanent magnet.

[0067] In order to position the second connection portion 102 and the third connection portion 103, in one embodiment, see Figure 4 As shown in the three-dimensional structural diagram of the third permanent magnet, the output shaft proposed in this embodiment has a positioning hole 801 provided on the surface where the third permanent magnet 8 contacts the fourth permanent magnet 9; and a positioning protrusion 901 is provided on the surface where the fourth permanent magnet 9 contacts the third permanent magnet 8.

[0068] The current state of the positioning protrusion 901 matches the shape of the positioning hole 801 ; when the third permanent magnet 8 is connected to the fourth permanent magnet 9 by magnetic force, the positioning protrusion 901 is accommodated in the positioning hole 801 .

[0069] Among them, the number of positioning holes 801 and positioning protrusions 901 can be multiple. When the number of positioning holes 801 and positioning protrusions 901 is one respectively and their shapes are rotational bodies, the positioning hole 801 is not located in the middle part of the end face of the third permanent magnet 8; the design of the positioning hole 801 and the positioning protrusion 901 can play a positioning role in the installation of the second connecting part 102 and the third connecting part 103.

[0070] In order to position the second connection portion 102 and the third connection portion 103, in another embodiment, see Figure 5 The structural diagram of the output shaft with a spring and a limiting ball is shown. This embodiment proposes an output shaft, which also includes: a spring 17 and a limiting ball 18.

[0071] A positioning hole 801 is provided on the surface of the third permanent magnet 8 that contacts the fourth permanent magnet 9 .

[0072] A through hole 902 is formed on the surface of the fourth permanent magnet 9 that contacts the third permanent magnet 8 . The opening of the through hole 902 close to the third permanent magnet 8 is smaller than the opening close to the second connecting boss 1031 .

[0073] The opening of the through hole 902 close to the third permanent magnet 8 is set to be smaller than the opening close to the second connecting boss 1031 , so that the limiting ball 18 will not pop out after the second connecting part 102 and the third connecting part 103 are disconnected, thereby playing a limiting role for the limiting ball 18 .

[0074] One end of the spring 17 is connected to the second connecting boss 1031 , and the other end of the spring 17 is connected to the limiting ball 18 .

[0075] When the third permanent magnet 8 is connected to the fourth permanent magnet 9 by magnetic force, a part of the limiting ball 18 extends out of the through hole 902 and is accommodated in the positioning hole 801 under the action of the spring 17 .

[0076] This not only solves the problem of positioning, but also if an overload occurs during the process of the output shaft rotating, the third permanent magnet 8 will squeeze the limiting ball 18 and the spring 17 during the rotation relative to the fourth permanent magnet 9, so that the limiting ball 18 enters the through hole 902, without affecting the relative rotation of the third permanent magnet 8 and the fourth permanent magnet 9.

[0077] In one embodiment, the first permanent magnet 3 , the second permanent magnet 5 , the third permanent magnet 8 , and the fourth permanent magnet 9 are respectively coaxially arranged with the output shaft body 1 .

[0078] Since the force required to pull apart the permanent magnets that attract each other is greater than that required to pull apart the permanent magnets that attract each other in an offset manner, the first permanent magnet 3, the second permanent magnet 5, the third permanent magnet 8 and the fourth permanent magnet 9 are coaxial to fully utilize the magnetic force and reduce the requirement on the magnetic force of the permanent magnets.

[0079] The fixed connection methods between the above-mentioned mounting groove and the connecting protrusion, the mounting groove and the permanent magnet, the permanent magnet and the mounting ring, the mounting ring and the connecting boss, etc. can be clamping, gluing, screw connection, etc., which are not limited in this embodiment.

[0080] When the first connection part 101 and the second connection part 102 are installed, they can be positioned by the first connection protrusion 1011 and the second connection protrusion 1012, and when the second connection part 102 and the third connection part 103 are installed, they can be positioned by the positioning hole 801 and the positioning protrusion 901; firstly, it can avoid that the first connection part 101, the second connection part 102 and the third connection part 103 in the output shaft are not in the same axis after being connected; secondly, the output end of the output shaft has a specific connection structure or requires a specific connection angle. During installation, it can be positioned by the above-mentioned positioning structure to avoid a certain angle of deflection of the connection parts of the assembled output shaft, which affects the installation effect.

[0081] See also Figure 6 The cross-sectional structure diagram of the servo electric cylinder shown in Figure 7 The exploded schematic diagram of the servo electric cylinder shown in the figure, this embodiment also proposes a servo electric cylinder, including: a mounting shell 10, and a driver 11, a gear transmission mechanism 12, a thrust screw 13, a nut 14, a thrust bearing 16 and the above-mentioned output shaft arranged in the mounting shell 10.

[0082] The installation housing 10 comprises: an output shaft end cover 1001 , a first installation housing 1002 , a second installation housing 1003 and a cover body 1004 which are fixedly connected in sequence.

[0083] The driver 11 is disposed in an accommodating space formed by the first installation shell 1002 and the second installation shell 1003 .

[0084] Here, the driver 11 is arranged in the above-mentioned accommodating space by means of snap-fitting or threaded connection.

[0085] In one embodiment, the driver 11 may be a motor.

[0086] The nut 14 is sleeved on the thrust screw 13 and threadedly connected to the thrust screw 13 .

[0087] The gear transmission mechanism 12 is disposed in the accommodating space and is fixed to the driver 11 and the thrust screw 13 respectively.

[0088] The thrust screw 13 is also rotatably mounted in the accommodation space via the thrust bearing 16 , and the driver 11 drives the thrust screw 13 to rotate via the gear transmission mechanism 12 .

[0089] An accommodating hole 1012 is defined in one end of the first connecting portion 101 away from the second connecting portion 102 .

[0090] One end of the first connection portion 101 opening the accommodating hole 1012 is sleeved on the thrust screw 13 , and the third connection portion 103 passes through the bottom of the output shaft end cover 1001 and is exposed outside the output shaft end cover 1001 .

[0091] One end of the output shaft body 1 having the receiving hole 1012 is fixedly connected to the end surface of the nut 14 , and the nut 14 moves the output shaft body 1 linearly.

[0092] Specifically, the gear transmission mechanism 12 includes: a driving gear 1201 , a first gear 1202 , a second gear 1203 , a third gear 1204 , and a fourth gear 1205 .

[0093] The driving gear 1201 is fixed to the output end of the driver 11 , and the fourth gear 1205 is fixed to the thrust screw 13 .

[0094] The first gear 1202 is meshed with the driving gear 1201 ; the second gear 1203 is meshed with the first gear 1202 .

[0095] The third gear 1204 is coaxially arranged with the second gear 1203 and rotates synchronously with the second gear 1203 .

[0096] The fourth gear 1205 is meshed with the third gear 1204 .

[0097] The diameter of the third gear 1204 is smaller than the diameter of the second gear 1203 .

[0098] In one embodiment, the first gear 1202 , the second gear 1203 , and the third gear 1204 are rotatably connected to the mounting housing 10 , respectively.

[0099] Furthermore, the servo electric cylinder proposed in this embodiment also includes: a nut guide rail 15.

[0100] The nut guide rail 15 disposed in the accommodating space is fixed to a side of the third gear 1204 away from the second gear 1203 .

[0101] The nut 14 performs linear motion along the nut guide rail 15 .

[0102] In summary, this embodiment proposes an output shaft and a servo electric cylinder, wherein a first permanent magnet and a second permanent magnet are arranged between a first connecting portion and a second connecting portion of the output shaft, and the first connecting portion and the second connecting portion are detachably connected through the magnetic force between the first permanent magnet and the second permanent magnet; and a third permanent magnet and a fourth permanent magnet are arranged between the second connecting portion and the third connecting portion of the output shaft, and the second connecting portion and the third connecting portion are detachably connected through the magnetic force between the third permanent magnet and the second permanent magnet; when the separation force between the first permanent magnet and the second permanent magnet is greater than the separation force between the first permanent magnet and the third permanent magnet, the first permanent magnet and the second permanent magnet are detachably connected. When the magnetic force between the two permanent magnets is greater than the magnetic force between the third permanent magnet and the fourth permanent magnet, the third permanent magnet is separated from the fourth permanent magnet, so that the second connecting part is disconnected from the third connecting part; when the separation force between the third permanent magnet and the fourth permanent magnet is greater than the magnetic force between the third permanent magnet and the fourth permanent magnet, the third permanent magnet is separated from the fourth permanent magnet, so that the second connecting part is disconnected from the third connecting part; the impact on other parts in the electric cylinder when the output shaft is subjected to excessive force can be reduced, thereby protecting the entire electric cylinder; moreover, after the output shaft is disconnected, the multiple connecting parts connected by the permanent magnets can be reused repeatedly, thereby improving the utilization rate of the output shaft.

[0103] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An output shaft, characterized in that: include: An output shaft body (1), a first permanent magnet (3), a second permanent magnet (5), a third permanent magnet (8) and a fourth permanent magnet (9); The output shaft body (1) comprises: a first connecting portion (101), a second connecting portion (102) and a third connecting portion (103); The first permanent magnet (3) is fixed to one end of the first connecting portion (101) close to the second connecting portion (102), and the second permanent magnet (5) is fixed to one end of the second connecting portion (102) close to the first connecting portion (101), and the first permanent magnet (3) and the second permanent magnet (5) are arranged opposite to each other after being fixed; The third permanent magnet (8) is fixed to one end of the second connecting portion (102) close to the third connecting portion (103), and the fourth permanent magnet (9) is fixed to one end of the third connecting portion (103) close to the second connecting portion (102); The first connecting portion (101) and the second connecting portion (102) are detachably connected via the magnetic force between the first permanent magnet (3) and the second permanent magnet (5); The second connecting portion (102) and the third connecting portion (103) are detachably connected via the magnetic force between the third permanent magnet (8) and the second permanent magnet (9); When the separation force between the first permanent magnet (3) and the second permanent magnet (5) is greater than the magnetic force between the first permanent magnet (3) and the second permanent magnet (5), the first permanent magnet (3) and the second permanent magnet (5) are separated, so that the first connecting portion (101) and the second connecting portion (102) are disconnected; When the separation force between the third permanent magnet (8) and the fourth permanent magnet (9) is greater than the magnetic force between the third permanent magnet (8) and the fourth permanent magnet (9), the third permanent magnet (8) is separated from the fourth permanent magnet (9), so that the second connecting portion (102) is disconnected from the third connecting portion (103).

2. The output shaft according to claim 1, characterized in that: Also includes: A first mounting groove (2) and a second mounting groove (4); A first connection protrusion (1011) is provided at one end of the first connection portion (101) close to the second connection portion (102), the first installation groove (2) is fixed on the first connection protrusion (1011), and the opening of the first installation groove (2) after being fixed faces the first connection portion (101); A second connection protrusion (1021) is provided at one end of the second connection portion (102) close to the first connection portion (101), and the second mounting groove (4) is fixed on the second connection protrusion (1021), and the opening of the second mounting groove (4) after being fixed faces the second connection portion (102); The first connecting protrusion (1011) is connected to the second connecting protrusion (1021); The first permanent magnet (3) is fixed in the first mounting groove (2), and the second permanent magnet (5) is fixed in the second mounting groove (4); the first permanent magnet (3) and the second permanent magnet (5) are connected by magnetic force.

3. The output shaft according to claim 1, characterized in that: Also includes: A first mounting ring (6) and a second mounting ring (7); A first connection boss (1022) is provided at one end of the second connection portion (102) close to the third connection portion (103), and a second connection boss (1031) is provided at one end of the third connection portion (103) close to the second connection portion (102); The first mounting ring (6) is sleeved on the first connecting boss (1022), the height of the first mounting ring (6) is higher than the height of the first connecting boss (1022), and the first mounting ring (6) and the first connecting boss (1022) form a first permanent magnet accommodating cavity; The second mounting ring (7) is sleeved on the second connecting boss (1031); the height of the second mounting ring (7) is higher than the height of the second connecting boss (1031); the second mounting ring (7) and the first connecting boss (1031) form a second permanent magnet accommodating cavity; wherein the opening of the second permanent magnet accommodating cavity faces the first permanent magnet accommodating cavity, and the second permanent magnet accommodating cavity is arranged opposite to the first permanent magnet accommodating cavity; The third permanent magnet (8) is fixed in the first permanent magnet accommodating cavity, and the fourth permanent magnet (9) is fixed in the second permanent magnet accommodating cavity; The third permanent magnet (8) is connected to the fourth permanent magnet (9) through magnetic force.

4. The output shaft according to claim 2, characterized in that: The first connecting protrusion (1011) and the second connecting protrusion (1021) are connected via the magnetic force generated between the first permanent magnet (3) and the second permanent magnet (5).

5. The output shaft according to claim 3, characterized in that: A positioning hole (801) is provided on the surface of the third permanent magnet (8) in contact with the fourth permanent magnet (9); a positioning protrusion (901) is provided on the surface of the fourth permanent magnet (9) in contact with the third permanent magnet (8); The current state of the positioning protrusion (901) matches the shape of the positioning hole (801); When the third permanent magnet (8) and the fourth permanent magnet (9) are connected by magnetic force, the positioning protrusion (901) is accommodated in the positioning hole (801).

6. The output shaft according to claim 3, characterized in that: Also includes: Spring (17) and limiting ball (18); A positioning hole (801) is provided on the surface of the third permanent magnet (8) in contact with the fourth permanent magnet (9); A through hole (902) is provided on the surface of the fourth permanent magnet (9) in contact with the third permanent magnet (8); wherein the opening of the through hole (902) close to the third permanent magnet (8) is smaller than the opening close to the second connecting boss (1031); One end of the spring (17) is connected to the second connecting boss (1031), and the other end of the spring (17) is connected to the limiting ball (18); When the third permanent magnet (8) and the fourth permanent magnet (9) are connected by magnetic force, part of the limiting ball (18) extends out of the through hole (902) and is accommodated in the positioning hole (801) under the action of the spring (17).

7. The output shaft according to claim 1, characterized in that: The first permanent magnet (3), the second permanent magnet (5), the third permanent magnet (8) and the fourth permanent magnet (9) are respectively arranged coaxially with the output shaft body (1).

8. A servo electric cylinder, characterized in that: include: A mounting housing (10), a driver (11), a gear transmission mechanism (12), a thrust screw (13), a nut (14), a thrust bearing (16) and an output shaft according to any one of claims 1 to 7, arranged in the mounting housing (10); The installation housing (10) comprises: an output shaft end cover (1001), a first installation housing (1002), a second installation housing (1003) and a cover body (1004) which are fixedly connected in sequence; The driver (11) is arranged in a housing space formed by the first installation shell (1002) and the second installation shell (1003); The nut (14) is sleeved on the thrust screw (13) and is threadedly connected to the thrust screw (13); The gear transmission mechanism (12) is arranged in the accommodating space and is respectively fixed to the driver (11) and the thrust screw (13); The thrust screw (13) is also rotatably mounted in the accommodating space via the thrust bearing (16), and the driver (11) drives the thrust screw (13) to rotate via the gear transmission mechanism (12); An accommodating hole (1012) is provided at one end of the first connecting portion (101) away from the second connecting portion (102); One end of the first connecting portion (101) having the receiving hole (1012) is sleeved on the thrust screw (13), and the third connecting portion (103) passes through the bottom of the output shaft end cover (1001) and is exposed outside the output shaft end cover (1001); One end of the output shaft body (1) having a receiving hole (1012) is fixedly connected to the end surface of the nut (14), and the nut (14) moves the output shaft body (1) in a linear motion.

9. The servo electric cylinder according to claim 8, characterized in that: The gear transmission mechanism (12) comprises: a driving gear (1201), a first gear (1202), a second gear (1203), a third gear (1204), and a fourth gear (1205); The driving gear (1201) is fixed to the output end of the driver (11), and the fourth gear (1205) is fixed to the thrust screw (13); The first gear (1202) is meshed with the driving gear (1201); the second gear (1203) is meshed with the first gear (1202); The third gear (1204) is coaxially arranged with the second gear (1203) and rotates synchronously with the second gear (1203); The fourth gear (1205) meshes with the third gear (1204).

10. The servo electric cylinder according to claim 8, characterized in that: Also includes: Nut guide (15); The nut guide rail (15) is arranged in the accommodating space and is fixed on a side of the third gear (1204) away from the second gear (1203); The nut (14) performs linear motion along the nut guide rail (15).

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