Flexible bidirectional buffering electric cylinder

Abstract

The utility model relates to the field of electric cylinders, in particular to a flexible two-way buffering electric cylinder which comprises an output assembly, a buffering assembly and a buffering assembly. The end, located in the cylinder body, of the piston rod is connected with a nut base. The driving assembly is used for driving the output assembly to operate; one end of the control shaft is connected with the driving assembly, and the other end of the control shaft is in threaded fit with the nut seat; the spring assembly is arranged on the cylinder body and used for providing buffering protection for the output rod. On one hand, the lead screw and the driving shaft are integrally arranged to be the control shaft to achieve linear connection between the driving assembly and the output assembly, the precision of the whole electric cylinder is improved, the energy consumption of the electric cylinder is reduced, and on the other hand, two-way buffering is achieved through a set of spring mechanisms at the cylinder opening.

Description

Technical Field

[0001] The present application relates to the field of electric cylinders, and in particular to a flexible bidirectional buffer electric cylinder. Background Art

[0002] At present, electric cylinders are being adopted by more and more industries due to their high efficiency, high precision and high load. With the popularity of electric cylinders, customers have higher and higher requirements for electric cylinders, mainly developing in the direction of high precision and high safety. For example, on the six-degree-of-freedom simulation platform for aerospace, simulation control often requires high-precision and high-response control, and flexible buffer protection test equipment is also required.

[0003] At present, the traditional electric cylinder structure is: the motor is connected to the screw through indirect transmission parts (such as gears, synchronous wheels, synchronous belts, keys, elastic couplings, etc.), and the piston rod is extended and retracted by driving the screw to rotate. Because there is a gap after the indirect transmission parts are assembled or the gap becomes larger after a period of use, the rotation gap of the entire electric cylinder will become larger and larger, affecting the accuracy of the electric cylinder.

[0004] In terms of buffer protection, electric cylinders are often designed with flexible materials (such as aluminum alloy, polyurethane, etc.) installed at both ends of the cylinder as a buffer for load bottoming out. However, in actual use, these flexible materials often cause the electric cylinder to bottom out and collide due to insufficient deformation distance (such as aluminum alloy) or insufficient damping force (such as polyurethane), which may cause damage to the load equipment. Utility Model Content

[0005] The utility model aims to solve one of the problems in the prior art.

[0006] To this end, the utility model provides a flexible bidirectional buffer electric cylinder.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] A flexible bidirectional buffer electric cylinder, comprising:

[0009] An output assembly, the output assembly comprising a cylinder body and a piston rod linearly movably arranged in the cylinder body;

[0010] Wherein, one end of the piston rod located in the cylinder body is connected to a nut seat;

[0011] A driving component, wherein the driving component is used to drive the output component to operate;

[0012] A control shaft, one end of which is connected to the driving assembly and the other end of which is threadedly engaged with the nut seat;

[0013] A spring assembly is arranged on the cylinder body to provide buffer protection for the output rod.

[0014] By adopting the above technical solution, one end of the control shaft is used as a screw rod and cooperates with the nut seat to control the linear movement of the piston rod, and the other end is used as a motor shaft connected to the rotor to become the output shaft of the motor, so that the screw rod and the output shaft are set as a whole, and the indirect transmission components (such as gears, synchronous wheels, synchronous belts, keys, couplings, etc.) are abandoned, and the direct torque transmission from the motor to the screw rod is realized, and the transmission efficiency from the motor to the screw rod can be close to 100%. Thereby improving the accuracy of the entire electric cylinder and reducing the energy consumption of the electric cylinder.

[0015] Furthermore, the driving assembly includes a stator assembly, a rotor assembly and a mounting shell, the mounting shell is connected to the tail of the cylinder body, the stator assembly is connected inside the mounting shell, the rotor assembly is connected to the control shaft, and the stator assembly and the rotor assembly can rotate relative to each other.

[0016] Furthermore, the control shaft is connected to the rotor assembly via a clamping hoop.

[0017] By adopting the above technical solution, expansion sleeve clamps are provided on both sides of the inner ring of the rotor assembly. After cooperating with the screw rod part, the side screws of the expansion sleeve clamps are tightened to deform the two sides of the inner ring of the rotor assembly, thereby fixing the rotor assembly to the control shaft and transmitting a larger torque.

[0018] Furthermore, one end of the mounting shell away from the cylinder body is connected to a rear hook, and one end of the control shaft away from the output assembly is connected to the rear hook via a bearing.

[0019] Furthermore, one end of the control shaft away from the output assembly is connected to a rotary encoder.

[0020] Furthermore, the output assembly also includes a cylinder body and a piston rod, one end of the piston rod located in the cylinder body is connected to a nut seat, the nut seat and the cylinder body are linearly movably connected, and the nut seat is sleeved on the control shaft and cooperates with the control shaft thread.

[0021] Furthermore, the piston rod is connected with a front hook, and the spring assembly is connected to the cylinder mouth end of the cylinder body and is located between the front hook and the cylinder body.

[0022] Furthermore, the spring assembly includes a spring seat, a spring guide rod and an elastic member. The spring seat is fixedly arranged at the cylinder mouth end of the cylinder body, one end of the spring guide rod is inserted in the spring tube, and the other end is connected to the front hinge. The elastic member is sleeved on the spring guide rod.

[0023] Furthermore, a plurality of the spring assemblies are provided, and the plurality of the spring assemblies are circumferentially arranged around the periphery of the piston rod.

[0024] Furthermore, a plurality of the spring assemblies constitute a buffer mechanism, which also includes a buffer cylinder, a buffer cylinder retaining ring and a pressure cover, wherein the buffer cylinder is connected to the cylinder mouth end of the cylinder body, the pressure cover is slidably connected to the buffer cylinder, the pressure cover is located at an end of the spring assembly away from the buffer seat, the buffer cylinder retaining ring is connected to an end of the buffer cylinder away from the cylinder body by screws, and the buffer cylinder retaining ring can limit the axial movement of the pressure cover.

[0025] By adopting the above technical solution, when the piston rod approaches the limit to the left, the piston rod drives the front hinge to move to the bottom of the cylinder body and contacts the pressure cover, and the pressure cover presses the spring assembly to move until the pressure cover contacts the spring seat; similarly, when the piston rod approaches the limit to the right, the right side of the big end of the piston rod contacts the spring seat, and the spring seat presses the spring assembly to move to the right until the pressure cover contacts the spring seat. When the pressure cover contacts the spring assembly seat, the speed is also zero. There is no hard collision in the whole process, and safe two-way flexible buffering can be achieved. Only a set of spring mechanisms are provided at the cylinder mouth of the cylinder body to achieve two-way buffering. There is no need to add a set of springs on both sides of the cylinder body. The structure is compact and the buffer mechanism is easy to repair.

[0026] Furthermore, the cylinder body is connected with an air pipe interface and a breathable valve, and the air pipe interface and the breathable valve are respectively located on two sides of the nut seat.

[0027] By adopting the above technical solution, the left side and the right side of the nut seat in the cylinder body are both closed cavities, which can pass high-pressure gas. On the one hand, it serves as an auxiliary power source to reduce the power consumption of the motor when the electric cylinder extends out; on the other hand, the compressed gas can also be used as a buffer protection for the load after the electric cylinder retracts, especially on a vertically mounted multi-degree-of-freedom platform. Of course, when there is no air source assistance, the air pipe interface can be equipped with a muffler as an exhaust port, which cooperates with the breathable valve to balance the air pressure in the left and right cavities of the piston rod.

[0028] Furthermore, a sealing ring is provided between the nut seat and the cylinder body.

[0029] The beneficial effect of the utility model is that the setting of the control shaft enables a linear connection between the drive assembly and the output assembly, abandoning transmission structures such as gears, synchronous wheels, synchronous belts and keys, and avoiding the reduction in the overall electric cylinder accuracy caused by transmission clearance. Secondly, two expansion sleeve clamps are provided on both sides of the inner ring of the rotor assembly. After matching with the control shaft, the side screws of the expansion sleeve clamps are tightened to deform the two sides of the inner ring of the rotor assembly, thereby fixing the rotor assembly and the control shaft and transmitting a large torque. This structure also abandons the coupling structure of the traditional linear electric cylinder, realizes the direct torque transmission from the drive assembly to the screw, and the transmission efficiency of the drive assembly to the screw can be close to 99.1-99.9%. Thereby improving the accuracy of the entire electric cylinder and reducing the energy consumption of the electric cylinder.

[0030] In the flexible buffer part, when the piston rod approaches the limit to the left, the piston rod drives the front twist to move to the bottom of the cylinder body and contact the gland, and the gland presses the spring assembly to move until the gland contacts the spring seat; similarly, when the piston rod approaches the limit to the right, the right side of the piston rod big head contacts the spring seat, and the spring seat presses the spring assembly to move to the right until the gland contacts the spring seat. Because the number and specifications of the springs can be adapted according to the output of the electric cylinder, when the gland contacts the spring assembly seat, the speed is also zero, and there is no hard collision in the whole process, which can achieve safe two-way flexible buffering. Another advantage of this structure is that a set of spring mechanisms can achieve two-way buffering, without adding a set of springs on both sides of the cylinder body, and the structure is compact. At the same time, maintenance is also very convenient. Just move the piston rod to the right for a distance, loosen the screws between the buffer cylinder retaining ring and the buffer cylinder, move the gland to the right, and the spring assembly can be taken out.

[0031] The air pipe interface and the breathable valve are used to ventilate the cylinder body. On the one hand, it serves as an auxiliary power source to reduce the power consumption of the motor when the electric cylinder is extended; on the other hand, the compressed gas can also be used as a buffer protection for the load after the electric cylinder retracts, especially on a vertically mounted multi-degree-of-freedom platform. When there is no air source assistance, the air pipe interface can be equipped with a muffler as an exhaust port to cooperate with the breathable valve to balance the air pressure in the left and right chambers of the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0033] Figure 1 It is a structural schematic diagram of the utility model.

[0034] Figure 2 It is used to reflect Figure 1 Enlarged view of section A of the middle buffer mechanism.

[0035] Figure 3 It is a structural schematic diagram of the spring assembly in the utility model.

[0036] In the figure: 1. output assembly; 10. cylinder body; 11. piston rod; 12. nut seat; 13. retaining ring; 14. bearing seat; 15. bearing cover; 16. tapered roller bearing; 17. air pipe interface; 18. breather valve; 2. drive assembly; 20. stator assembly; 21. rotor assembly; 22. mounting shell; 23. rear twist; 24. deep groove ball bearing; 25. rotary encoder; 26. expansion sleeve clamp; 27. aviation socket; 3. buffer mechanism; 30. buffer cylinder; 31. buffer cylinder retaining ring; 32. cover; 33. buffer seat; 34. spring assembly; 340. spring seat; 341. spring guide rod; 342. elastic member; 343. guide rod retaining ring; 35. slider; 4. control shaft; 40. front twist. DETAILED DESCRIPTION

[0037] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0038] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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.

[0040] Reference Figure 1-Figure 3 A flexible bidirectional buffer electric cylinder comprises a driving assembly 2, an output assembly 1, a control shaft 4 and a buffer mechanism 3. The output assembly 1 comprises a cylinder body 10 and a piston rod 11, the piston rod 11 is inserted into the cylinder body 10 and slides with the cylinder body 10 along its axial direction, a nut seat 12 is connected to one end of the piston rod 11 located in the cylinder body 10, the nut seat 12 is coaxially embedded on the inner wall of the piston rod 11, one end of the nut seat 12 is exposed at the end of the piston rod 11, and a sealing ring is arranged between the piston rod 11 and the inner wall of the cylinder body 10.

[0041] The driving assembly 2 includes a stator assembly 20, a rotor assembly 21 and a mounting shell 22. The mounting shell 22 is fixedly connected to the bottom of the cylinder body 10 through a bearing seat 14 and a bearing cover 15. The bearing seat 14 is connected to the mounting shell 22. The bearing cover 15 is connected to the side of the bearing seat 14 close to the cylinder body 10. The bearing cover 15 is connected to the cylinder body 10, and the stator assembly 20 is fixedly connected to the inner wall of the mounting shell 22.

[0042] One end of the control shaft 4 passes through the rotor assembly 21 and is connected to the rotor assembly 21, and the other end is set as a screw. One end of the control shaft 4 set as a screw passes through the nut seat 12 and is inserted into the piston rod 11. The control shaft 4 is connected to the rotor assembly 21 through a clamping hoop 26. The control shaft 4 is threadedly connected to the nut seat 12. A retaining ring 13 is set between the nut seat 12 and the control shaft 4 and the cylinder body 10. The control shaft 4 is connected to the bearing seat 14 through a tapered roller bearing 16. A sealing ring is connected between the control shaft 4 and the bearing cover 15.

[0043] The end of the mounting shell 22 away from the output assembly 1 is connected to the rear hinge 23, and one end of the control shaft 4 passing through the rotor assembly 21 is connected to the rear hinge 23 through a deep groove ball bearing 24. The end of the control shaft 4 away from the output assembly 1 is also connected to a rotary encoder 25, and the lead of the rotary encoder 25 is connected to the external aviation socket 27 through the side hole of the rear hinge.

[0044] One end of the control shaft 4 is used as a screw rod and cooperates with the nut seat 12 to control the linear movement of the piston rod 11, and the other end is used as a motor shaft connected to the rotor assembly 21 to become the output shaft of the motor, so that the screw rod and the output shaft are set as a whole, and the indirect transmission components (such as gears, synchronous wheels, synchronous belts, keys, couplings, etc.) are abandoned, and the direct torque transmission from the motor to the screw rod is realized. The transmission efficiency from the motor to the screw rod can be close to 99.1-99.9%. Thereby improving the accuracy of the entire electric cylinder and reducing the energy consumption of the electric cylinder, that is, the integrated design of the control shaft 4 can not only improve the transmission efficiency of the electric cylinder, but also reduce costs and facilitate maintenance.

[0045] In addition, the inner ring of the rotor assembly 21 is provided with a clamping sleeve 26 on both sides. After cooperating with the screw part, the side screws of the clamping sleeve 26 are tightened to deform the inner ring of the rotor assembly 21, thereby fixing the rotor assembly 21 to the control shaft 4 and transmitting a larger torque.

[0046] The buffer mechanism 3 includes a buffer cylinder 30, a buffer cylinder retaining ring 31, a pressure cover 32, and multiple spring assemblies 34. The buffer cylinder 30 is coaxially connected to the cylinder mouth end of the cylinder body 10. The buffer cylinder 30 is connected to a buffer seat 33. The buffer seat 33 is used to install the spring assembly 34. There are multiple spring assemblies 34, and the multiple spring assemblies 34 are circumferentially arranged in the buffer cylinder 30. The pressure cover 32 is connected to a slider 35. The slider 35 is slidably connected to the inner wall of the buffer cylinder 30 so that the pressure cover 32 is axially slidably connected to the buffer cylinder 30. The pressure cover 32 is located at the end of the spring assembly 34 away from the buffer seat 33. The buffer cylinder retaining ring 31 is connected to the end of the buffer cylinder 30 away from the cylinder body 10 by screws, and the slider 35 is limited in the buffer cylinder 30.

[0047] The spring assembly 34 includes a spring seat 340, an elastic member 342, a spring guide rod 341 and a guide rod retaining ring 343. The spring seat 340 is fixedly connected to the buffer seat 33. The spring guide rod 341 is slidably connected to the spring seat 340 along the axial direction of the buffer seat 33. One end of the spring guide rod 341 is inserted into the spring seat 340, and the other end is connected to the pressure cover 32. The guide rod retaining ring 343 is arranged at the bottom of the spring seat 340. The elastic member 342 is a spring, preferably a rectangular spring. Compared with ordinary circular springs, the rectangular spring has a larger elastic coefficient and a better buffering effect. The rectangular spring is sleeved on the spring guide rod 341. One end of the rectangular spring is connected to the inner bottom of the spring seat 340, and the other end is connected to the end of the spring guide rod 341 away from the buffer seat 33. The piston rod 11 is connected to a front twist 40 , which is located on the side of the buffer tube 30 away from the cylinder body 10 . The end of the piston rod 11 away from the nut seat 12 passes through the buffer seat 33 and the front twist 40 . A plurality of spring assemblies 34 are circumferentially arranged on the periphery of the piston rod 11 .

[0048] Along the axial direction of the cylinder body 10, with the side of the drive assembly 2 as the left and the side of the buffer mechanism 3 as the right, when the piston rod 11 approaches the limit to the left, the piston rod 11 drives the front twist 40 to move to the bottom of the cylinder body 10 and contact the pressure cover 32, and the pressure cover 32 presses the spring assembly 34 to move until the pressure cover 32 contacts the spring seat 340; similarly, when the piston rod 11 approaches the limit to the right, the right side of the big end of the piston rod 11 contacts the spring seat 340, and the spring seat 340 presses the spring assembly 34 to move to the right until the pressure cover 32 contacts the spring seat 340. Because the number and specifications of the springs can be adapted according to the output of the electric cylinder, when the pressure cover 32 contacts the spring assembly 34 seat, the speed is also zero, and there is no hard collision in the whole process, which can achieve safe two-way flexible buffering. Another advantage of this structure is that only one set of buffer mechanisms 3 needs to be set on one side of the cylinder body 10 to achieve two-way buffering, and the structure is compact. Meanwhile, maintenance is also very convenient. It is only necessary to move the piston rod 11 to the right for a certain distance, loosen the screws between the buffer cylinder retaining ring 31 and the buffer cylinder 30, move the pressure cover 32 to the right, and then the spring assembly 34 can be taken out.

[0049] In addition, the cylinder body 10 can also be connected to an air pipe interface 17 and a breather valve 18. The air pipe interface 17 is arranged on the side wall of the cylinder body 10 near the bottom of the cylinder body 10, and the breather valve 18 is arranged on the side wall of the cylinder body 10 near the bottom of the cylinder mouth. The air pipe interface 17 and the breather valve 18 are respectively located on both sides of the nut seat 12.

[0050] The left side and the right side of the nut seat 12 in the cylinder body 10 are both closed cavities, which can pass high-pressure gas. On the one hand, it can serve as an auxiliary power source to reduce the power consumption of the motor when the electric cylinder is extended; on the other hand, the compressed gas can also serve as a buffer protection for the load after the electric cylinder retracts, especially on a vertically mounted multi-degree-of-freedom platform. Of course, when there is no air source assistance, the air pipe interface 17 can be equipped with a muffler as an exhaust port, and cooperate with the air vent valve 18 to balance the air pressure in the left and right cavities of the piston rod 11.

[0051] The implementation principle of this embodiment is:

[0052] When the power is on, the stator assembly 20 drives the rotor assembly 21 to rotate, the rotor assembly 21 drives the control shaft 4 to rotate, and the control shaft 4 drives the nut seat 12 and the piston rod 11 to perform left and right linear motion in the cylinder body 10 .

[0053] When the piston rod 11 approaches the limit to the left, the piston rod 11 drives the front hook 40 to move toward the bottom of the cylinder body 10 and contact the gland 32, and the gland 32 presses the spring assembly 34 to move until the gland 32 contacts the spring seat 340; similarly, when the piston rod 11 approaches the limit to the right, the right side of the big end of the piston rod 11 contacts the spring seat 340, and the spring seat 340 presses the spring assembly 34 to move to the right until the gland 32 contacts the spring seat 340, thereby achieving two-way buffering. At the same time, maintenance is also very convenient, just move the piston rod 11 to the right for a distance, loosen the screws between the buffer cylinder retaining ring 31 and the buffer cylinder 30, move the gland 32 to the right, and the spring assembly 34 can be taken out.

[0054] In summary, firstly, the setting of the control shaft 4 enables a linear connection between the drive assembly 2 and the output assembly 1, abandoning transmission structures such as gears, synchronous wheels, synchronous belts and keys, and avoiding the reduction in overall electric cylinder accuracy caused by transmission clearance. Secondly, two expansion sleeve clamps 26 are provided on both sides of the inner ring of the rotor assembly 21. After matching with the control shaft 4, the side screws of the expansion sleeve clamps 26 are tightened to deform the inner ring of the rotor assembly 21, so that the rotor assembly 21 is fixed to the control shaft 4 and can transmit a large torque. This structure also abandons the coupling structure of the traditional linear electric cylinder, realizes the direct torque transmission from the drive assembly 2 to the screw, and the transmission efficiency of the drive assembly 2 to the screw can be close to 99.1-99.9%. Thereby improving the accuracy of the entire electric cylinder and reducing the energy consumption of the electric cylinder.

[0055] Flexible buffering part, when the piston rod 11 approaches the limit to the left, the piston rod 11 drives the front twist 40 to move to the bottom of the cylinder body 10 and contact the pressure cover 32, and the pressure cover 32 presses the spring assembly to move until the pressure cover 32 contacts the spring seat 340; similarly, when the piston rod 11 approaches the limit to the right, the right side of the big head of the piston rod 11 contacts the spring seat 340, and the spring seat 340 presses the spring assembly to move to the right until the pressure cover 32 contacts the spring seat 340. Because the number and specifications of the springs can be adapted according to the output of the electric cylinder, when the pressure cover 32 contacts the spring assembly seat, the speed is also zero, and there is no hard collision in the whole process, which can achieve safe two-way flexible buffering. Another advantage of this structure is that only one set of buffer mechanisms 3 needs to be set on one side of the cylinder body 10 to achieve two-way buffering (in the prior art, buffer structures need to be set at both ends of the cylinder body 10 to achieve two-phase buffering), and the structure is compact. Meanwhile, maintenance is also very convenient. It is only necessary to move the piston rod 11 to the right for a certain distance, loosen the screws between the buffer cylinder retaining ring 31 and the buffer cylinder 30, move the pressure cover 32 to the right, and then the spring assembly can be taken out.

[0056] The air pipe interface 17 and the air vent valve 18 are used to ventilate the cylinder body 10. On the one hand, it serves as an auxiliary power source to reduce the power consumption of the motor when the electric cylinder is extended; on the other hand, the compressed gas can also be used as a buffer protection for the load after the electric cylinder retracts, especially on a vertically mounted multi-degree-of-freedom platform. When there is no air source assistance, the air pipe interface 17 can be equipped with a muffler as an exhaust port to cooperate with the air vent valve 18 to balance the air pressure in the left and right chambers of the piston rod 11.

[0057] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A flexible bidirectional buffer electric cylinder, characterized in that: include: An output assembly (1), the output assembly (1) comprising a cylinder (10) and a piston rod (11) linearly movably arranged in the cylinder (10); Wherein, one end of the piston rod (11) located in the cylinder body (10) is connected to a nut seat (12); A driving component (2), wherein the driving component (2) is used to drive the output component (1) to operate; A control shaft (4), one end of which is connected to the driving assembly (2), and the other end of which is threadedly engaged with the nut seat (12); A spring assembly (34) is arranged on the cylinder body (10) and is used to provide buffer protection for the output rod.

2. The flexible bidirectional buffer electric cylinder according to claim 1, characterized in that: The driving assembly (2) comprises a stator assembly (20), a rotor assembly (21) and a mounting shell (22); the mounting shell (22) is connected to the rear end of the cylinder body (10); the stator assembly (20) is connected inside the mounting shell (22); the rotor assembly (21) is connected to the control shaft (4); and the stator assembly (20) and the rotor assembly (21) are capable of relative rotation.

3. The flexible bidirectional buffer electric cylinder according to claim 2, characterized in that: The control shaft (4) is connected to the rotor assembly (21) via a tightening sleeve clamp (26).

4. The flexible bidirectional buffer electric cylinder according to claim 2, characterized in that: One end of the mounting shell (22) away from the cylinder body (10) is connected to a rear hinge (23), and one end of the control shaft (4) away from the output assembly (1) is connected to the rear hinge (23) via a bearing.

5. The flexible bidirectional buffer electric cylinder according to claim 1, characterized in that: One end of the control shaft (4) away from the output assembly (1) is connected to a rotary encoder (25).

6. The flexible bidirectional buffer electric cylinder according to claim 1, characterized in that: The piston rod (11) is connected to a front hinge (40), and the spring assembly (34) is connected to the cylinder mouth end of the cylinder body (10) and is located between the front hinge (40) and the cylinder body (10).

7. The flexible bidirectional buffer electric cylinder according to claim 6, characterized in that: The spring assembly (34) comprises a spring seat (340), a spring guide rod (341) and an elastic member (342); the spring seat (340) is fixedly arranged at the cylinder mouth end of the cylinder body (10); one end of the spring guide rod (341) is inserted into the spring seat (340) and the other end is connected to the front hinge (40); the elastic member (342) is sleeved on the spring guide rod (341).

8. The flexible bidirectional buffer electric cylinder according to claim 6, characterized in that: A plurality of the spring assemblies (34) are provided, and the plurality of the spring assemblies (34) are circumferentially arranged on the periphery of the piston rod (11).

9. The flexible bidirectional buffer electric cylinder according to claim 8, characterized in that: The invention also comprises a buffer mechanism (3), wherein the buffer mechanism (3) further comprises a buffer cylinder (30), a buffer cylinder retaining ring (31) and a pressure cover (32), wherein the buffer cylinder (30) is connected to the cylinder mouth end of the cylinder body (10), the pressure cover (32) is slidably connected to the buffer cylinder (30), the pressure cover (32) is located at the end of the spring assembly (34) away from the buffer seat (33), the buffer cylinder retaining ring (31) is connected to the end of the buffer cylinder (30) away from the cylinder body (10) by screws, and the buffer cylinder retaining ring (31) can limit the axial movement of the pressure cover (32).

10. The flexible bidirectional buffer electric cylinder according to claim 1, characterized in that: The cylinder body (10) is connected to an air pipe interface (17) and an air vent valve (18), and the air pipe interface (17) and the air vent valve (18) are respectively located on two sides of the nut seat (12).

11. The flexible bidirectional buffer electric cylinder according to claim 10, characterized in that: A sealing ring is provided between the nut seat (12) and the cylinder body (10).

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