A single-drive and double-drive switching electric cylinder group

Abstract

An electric cylinder group with single-drive and double-drive switching relates to the field of electric cylinders, including a motor assembly, a clutch transmission assembly, an electric cylinder assembly, and an electric cylinder housing; the present invention adopts a clutch transmission assembly to flexibly switch the driving mode according to different working conditions. The present invention adopts a frameless torque motor drive to ensure the efficient transmission of driving force, reduce energy loss during power transmission, improve transmission efficiency, and reduce the size of the power part, making the design more compact. The present invention adopts a two-stage planetary roller screw subassembly set design. While bearing a higher load, the two-stage push rods can be quickly extended at the same time, greatly shortening the response time, and adjusting the posture of the mechanism efficiently and accurately. The present invention adopts two guide rails to ensure the linearity of the electric cylinder during movement, reduce friction and wear, and improve the smoothness of movement and service life.

Description

Technical Field

[0001] The present invention relates to the field of electric cylinders, and in particular to a single-drive and double-drive switchable electric cylinder group. Background Art

[0002] Electric cylinders are actuators that convert electrical energy into mechanical energy and achieve linear reciprocating motion. They are widely used in various fields. In particular, in pitch angle adjustment or height adjustment of lifting mechanisms, the electric cylinder is installed at the bottom of the mechanism, and the pitch angle and height adjustment of the mechanism can be achieved by extending and retracting the electric cylinder push rod.

[0003] At present, in the process of adjusting the pitch angle or the height of the lifting mechanism, the common methods are to use a single electric cylinder for adjustment and to use multiple electric cylinders for independent control. Although the single electric cylinder adjustment method has a relatively simple structure, it has the problem of insufficient power when facing a large load, and cannot meet the complex working conditions that require simultaneous height and pitch angle adjustment; and although the method of independently controlling multiple electric cylinders can achieve complex motion combinations, the synchronization accuracy is low, and it is difficult to ensure that the telescopic movements of multiple electric cylinders are completely synchronized.

[0004] At the same time, the existing electric cylinder driving mode is relatively simple and cannot flexibly switch the driving mode according to actual working conditions. For example, in some cases, only one electric cylinder is needed to meet the requirements, while sometimes two electric cylinders are needed to cooperate in extension and retraction to meet the requirements.

[0005] In addition, in order to improve the synchronization accuracy of the dual electric cylinders, mechanical methods are often used to achieve a hard connection between the two electric cylinders, and various intermediate transmission mechanisms are used to transmit power to the lead screws in the cylinder bodies on both sides, thereby achieving synchronous extension and retraction of the dual electric cylinder push rods. However, the complex intermediate transmission link will lose power transmission efficiency, thereby affecting the response speed, load capacity and stability of the extension and retraction of the electric cylinder push rods. Summary of the invention

[0006] The purpose of the present invention is to solve the problems existing in the background technology and to provide an electric cylinder group with single-drive and double-drive switching.

[0007] A single-drive and double-drive switchable electric cylinder assembly, characterized in that it comprises a motor assembly, a clutch transmission assembly, an electric cylinder assembly, and an electric cylinder housing;

[0008] The motor assembly includes a frameless torque motor stator and a frameless torque motor rotor; one end of the frameless torque motor stator abuts against the shoulder of the primary lead screw to achieve the positioning of the frameless torque motor stator; the frameless torque motor rotor is fixed to the outer wall of the primary lead screw by structural adhesive, and is fixedly connected to the primary lead screw to transmit power;

[0009] The clutch transmission assembly comprises an electromagnetic clutch active part, an electromagnetic clutch driven part, and a gear set; wherein the electromagnetic clutch active part and the electromagnetic clutch driven part are positioned by the shaft shoulder of the primary lead screw respectively, wherein the electromagnetic clutch driven part and the primary lead screw are connected by a key, rotate synchronously and transmit power; when the coil of the electromagnetic clutch active part is energized, a magnetic field is generated, thereby attracting the armature of the electromagnetic clutch driven part to overcome the elastic force of the spring, so that the electromagnetic clutch driven part moves toward the electromagnetic clutch active part, and finally compresses the active friction plate and the driven friction plate installed between the active part and the driven part, so that the electromagnetic clutch active part and the electromagnetic clutch driven part rotate synchronously through friction force;

[0010] The active part of the electromagnetic clutch includes a coil, an iron core, a sleeve, and an active friction plate; the iron core is used to strengthen the magnetic field, so that the clutch responds more quickly, and to strengthen the friction between the friction plates to improve the transmission efficiency; the sleeve is fixedly connected to the active gear to transmit power; the active friction plate cooperates with the driven friction plate to transmit power;

[0011] The driven part of the electromagnetic clutch comprises an armature, a driven friction plate, and a spring; one end of the spring is fixedly connected to the primary lead screw, and the other end is fixedly connected to the lower end of the driven part of the electromagnetic clutch. When the power is off, the magnetic field disappears, and the elastic force of the spring pulls the driven part of the electromagnetic clutch back to its original position, thereby disconnecting the connection between the driven part of the electromagnetic clutch and the active part of the electromagnetic clutch;

[0012] The gear set includes a driving gear, an idler gear, an idler gear shaft, and a driven gear; wherein the driving gear is fixedly connected to the sleeve of the active part of the electromagnetic clutch to transmit power; the driven gear is connected to the primary lead screw of the electric cylinder on the other side through a key to transmit power; wherein the idler gear is installed on the idler gear shaft, positioned by the shoulder of the idler gear shaft, and meshed with the driving gear and the driven gear respectively to realize power transmission, while increasing the center distance between the driving gear and the driven gear, making the distance between the two electric cylinders more reasonable;

[0013] The electric cylinder assembly comprises a primary planetary roller screw pair, a secondary planetary roller screw pair, and a bearing group;

[0014] The first-level planetary roller screw pair comprises a first-level screw, a first-level planetary roller, a first-level support frame, a first-level retaining ring, a first-level nut, a first-level push rod, a first-level push rod front end cover, and a first-level guide rail; a first-level support frame is arranged on the first-level nut, two ends of the first-level planetary roller are respectively connected to the first-level support frame, the first-level planetary roller is threadedly connected to the first-level nut, the first-level screw is threadedly connected to the first-level planetary roller, the first-level retaining ring is fixedly arranged on the inner wall of the first-level nut to fix the first-level support frame, the first-level push rod is correspondingly installed on the first-level nut by bolts, the track of the first-level guide rail is arranged on the outer wall of the first-level push rod, and the keyway of the first-level guide rail is arranged inside the front end cover of the first-level push rod;

[0015] The secondary planetary roller screw pair comprises a secondary hollow screw, a secondary planetary roller, a secondary support frame, a secondary retaining ring, a secondary nut, a secondary push rod, a secondary push rod front end cover, and a secondary guide rail; a secondary support frame is arranged on the secondary nut, two ends of the secondary planetary roller are respectively connected to the secondary support frame, the secondary planetary roller is threadedly connected to the secondary nut, the secondary hollow screw is threadedly connected to the secondary planetary roller, the secondary retaining ring is fixedly arranged on the inner wall of the secondary nut to fix the secondary support frame, the secondary push rod is correspondingly installed on the secondary nut by bolts, the track of the secondary guide rail is arranged on the outer wall of the secondary push rod, and the keyway of the secondary guide rail is arranged inside the front end cover of the secondary push rod;

[0016] The lower half of the primary lead screw is a stepped shaft, which is used for positioning and installing various parts on the shaft;

[0017] The first-stage push rod is hollow inside, and a through hole is opened in the center of the bottom of the push rod, so that the first-stage screw passes through the first-stage push rod and is set inside the second-stage hollow screw.

[0018] The lower half of the secondary hollow lead screw is a smooth axis section, and the bottom shaft end abuts against the inner wall of the bottom of the primary push rod. When the primary push rod rises along the primary lead screw, the secondary hollow lead screw also rises accordingly. The secondary hollow lead screw is processed with an internal spline, which cooperates with the external spline at the top of the primary lead screw, so that the secondary hollow lead screw rises and rotates at the same time.

[0019] The bearing group includes a first bearing and a second bearing; wherein the first bearing is installed in the bearing fixing seat of the electric cylinder base to support the rotational movement of the primary screw; the second bearing is installed at the bottom end of the secondary hollow screw to support the rotational movement of the secondary hollow screw;

[0020] The electric cylinder housing comprises a front end cover of the electric cylinder and an outer shell of the electric cylinder; wherein the front end cover of the electric cylinder is provided with a round hole, which cooperates with the front end cover of the primary push rod to prevent dust and other impurities from entering the interior of the electric cylinder; the front end cover of the electric cylinder is connected to the outer shell of the electric cylinder by screws;

[0021] The electric cylinder housing includes a bearing fixing seat and an idler shaft fixing seat, which are used to install and position the first bearing and the idler shaft respectively;

[0022] The electric cylinder housing is provided with radial holes for passing wires.

[0023] Working process and working principle of the present invention:

[0024] By using the transmission mode of electromagnetic clutch and gear set, the working mode switching between single motor controlling two screws to rotate synchronously and single motor controlling one screw to rotate or dual motor controlling two screws to rotate is realized. When two electric cylinders need to work synchronously, the rotor of the frameless torque motor on the left drives the primary screw to rotate, and the primary screw transmits the rotational motion to the driven part of the electromagnetic clutch through the key connection. At this time, the coil of the electromagnetic clutch is energized, and the active part of the electromagnetic clutch generates a magnetic field, which attracts the driven part of the electromagnetic clutch to move toward the active part of the electromagnetic clutch and presses the friction plate, so that the rotational motion of the primary screw is transmitted to the active part of the electromagnetic clutch. The active part of the electromagnetic clutch is fixedly connected to the active gear. Through the transmission of the gear set, the rotational motion of the left primary screw is transmitted to the right primary screw, so that the synchronous rotation of the two screws is realized, so that the two electric cylinder push rods are synchronously extended and retracted, and the height of the mechanism is adjusted. When only a single electric cylinder is required to work or the two electric cylinder push rods need to be extended and retracted to different lengths to adjust the pitch angle, the coil of the electromagnetic clutch is de-energized. At this time, the rotational motion of the driven part of the electromagnetic clutch will not be transmitted to the active part of the electromagnetic clutch, so that the two electric cylinders can work independently and flexibly face different complex working conditions.

[0025] Working principle of electric cylinder: The primary screw converts the rotational motion of the primary screw into the linear motion of the primary nut through the primary planetary roller, and the primary nut is fixedly connected to the primary push rod by bolts, thereby realizing the linear motion of the primary push rod. The interior of the primary push rod is hollow, and a through hole is opened in the center of the bottom of the primary push rod, so that the primary screw passes through the primary push rod and is set inside the secondary hollow screw. The top of the primary screw is processed with an external spline, which cooperates with the internal spline of the secondary hollow screw to transmit the rotational motion of the primary screw to the secondary hollow screw; the bottom end face of the secondary hollow screw abuts against the inner wall of the bottom of the primary push rod. When the primary push rod rises along the primary screw, the secondary hollow screw also rises with it. The secondary hollow screw is processed with an internal spline, which cooperates with the external spline at the top of the primary screw, so that the secondary hollow screw rises and rotates at the same time, and the rotational motion of the secondary hollow screw is converted into the linear motion of the secondary nut through the secondary planetary roller. The secondary nut is fixedly connected to the secondary push rod by bolts, thereby realizing the linear motion of the secondary push rod.

[0026] Beneficial effects of the present invention:

[0027] The present invention adopts a clutch transmission component to flexibly switch the driving mode according to different working conditions. When the dual electric cylinders need to be extended and retracted synchronously to adjust the height, a single motor can be used to control the synchronous rotation of the two screws; when only a single electric cylinder needs to be extended or the dual electric cylinders need to be extended to different lengths to adjust the pitch angle, two motors can be used to independently control the rotation of the two screws.

[0028] The present invention adopts a frameless torque motor drive, which ensures efficient transmission of driving force, reduces energy loss in the power transmission process, improves transmission efficiency, and reduces the size of the power part, making the design more compact.

[0029] The present invention adopts a two-stage planetary roller screw subassembly set design. While bearing a higher load, the two-stage push rods can be quickly extended at the same time, greatly shortening the response time and adjusting the mechanism posture efficiently and accurately.

[0030] The present invention adopts two guide slide rails to ensure the linearity of the electric cylinder during movement, reduce friction and wear, and improve the stability of movement and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a cross-sectional view of an embodiment of the present invention.

[0032] Figure 2 A cross-sectional view of an electric cylinder assembly according to an embodiment of the present invention

[0033] Figure 3 A cross-sectional view of the electromagnetic clutch.

[0034] In the figure: 1-motor assembly; 11-frameless torque motor stator; 12-frameless torque motor rotor; 2-clutch transmission assembly; 21-electromagnetic clutch active part; 211-coil; 212-iron core; 213-sleeve; 214-active friction plate; 22-electromagnetic clutch driven part; 221-armature; 222-driven friction plate; 223-spring; 23-gear set; 231-active gear; 232-idler; 233-idler shaft; 234-driven gear; 3-electric cylinder assembly; 31-first-stage planetary roller screw pair; 311-first-stage screw; 312-first-stage planetary roller; 313-first-stage support frame; 3 14-primary retaining ring; 315-primary nut; 316-primary push rod; 317-primary push rod front end cover; 318-primary guide rail; 32-secondary planetary roller screw pair; 321-secondary hollow screw; 322-secondary planetary roller; 323-secondary support frame; 324-secondary retaining ring; 325-secondary nut; 326-secondary push rod; 327-secondary push rod front end cover; 328-secondary guide rail; 33-bearing group; 331-first bearing; 332-second bearing; 4-electric cylinder housing; 41-electric cylinder front end cover; 42-electric cylinder housing; 421-bearing fixing seat; 422-idle shaft fixing seat. DETAILED DESCRIPTION

[0035] See also Figure 1 , Figure 2 and Figure 3 Shown is an embodiment of the present invention.

[0036] A single-drive and double-drive switchable electric cylinder assembly, comprising a motor assembly 1, a clutch transmission assembly 2, an electric cylinder assembly 3, and an electric cylinder housing 4;

[0037] The motor assembly 1 includes a frameless torque motor stator 11 and a frameless torque motor rotor 12; one end of the frameless torque motor stator 11 abuts against the shoulder of the primary lead screw 311 to achieve positioning of the frameless torque motor stator 11; the frameless torque motor rotor 12 is fixed to the outer wall of the primary lead screw 311 by structural adhesive, and is fixedly connected to the primary lead screw 311 to transmit power;

[0038] The clutch transmission assembly 2 comprises an electromagnetic clutch active part 21, an electromagnetic clutch driven part 22 and a gear set 23; wherein the electromagnetic clutch active part 21 and the electromagnetic clutch driven part 22 are respectively positioned by the shaft shoulder of the primary lead screw 311, wherein the electromagnetic clutch driven part 22 and the primary lead screw 311 are connected by a key, and rotate synchronously and transmit power; when the coil 211 of the electromagnetic clutch active part 21 is energized, a magnetic field is generated, thereby attracting the armature 221 of the electromagnetic clutch driven part 22 to overcome the elastic force of the spring 223, so that the electromagnetic clutch driven part 22 moves toward the electromagnetic clutch active part 21, and finally compresses the active friction plate 214 and the driven friction plate 222 installed between the active part and the driven part, and the electromagnetic clutch active part 21 and the electromagnetic clutch driven part 22 rotate synchronously through friction;

[0039] The active part 21 of the electromagnetic clutch comprises a coil 211, an iron core 212, a sleeve 213 and an active friction plate 214; wherein the iron core 212 is used to strengthen the magnetic field, so that the clutch responds more quickly, and to strengthen the friction between the friction plates, thereby improving the transmission efficiency; the sleeve 213 is fixedly connected to the active gear 231 to transmit power; wherein the active friction plate 214 cooperates with the driven friction plate 222 to transmit power;

[0040] The electromagnetic clutch driven part 22 comprises an armature 221, a driven friction plate 222, and a spring (223; one end of the spring 223 is fixedly connected to the primary lead screw 311, and the other end is fixedly connected to the lower end of the electromagnetic clutch driven part 22. When the power is off, the magnetic field disappears, and the elastic force of the spring pulls the electromagnetic clutch driven part 22 back to its original position, thereby disconnecting the electromagnetic clutch driven part 22 from the electromagnetic clutch active part 21.

[0041] The gear set 23 includes a driving gear 231, an idler gear 232, an idler gear shaft 233 and a driven gear 234; wherein the driving gear 231 is fixedly connected to the sleeve 213 of the electromagnetic clutch driving part 21 to transmit power; the driven gear 234 is connected to the primary lead screw 311 of the electric cylinder on the other side through a key to transmit power; wherein the idler gear 232 is installed on the idler gear shaft 233, positioned by the shoulder of the idler gear shaft 233, and meshed with the driving gear 231 and the driven gear 234 respectively to realize power transmission, while increasing the center distance between the driving gear and the driven gear, so that the distance between the two electric cylinders is more reasonable;

[0042] The electric cylinder assembly 3 includes a primary planetary roller screw pair 31, a secondary planetary roller screw pair 32, and a bearing group 33;

[0043] The first-level planetary roller screw pair 31 comprises a first-level screw 311, a first-level planetary roller 312, a first-level support frame 313, a first-level retaining ring 314, a first-level nut 315, a first-level push rod 316, a first-level push rod front end cover 317, and a first-level guide rail 318; a first-level support frame 313 is provided on the first-level nut 315, two ends of the first-level planetary roller 312 are respectively connected to the first-level support frame 313, the first-level planetary roller 312 is threadedly connected to the first-level nut 315, the first-level screw 311 is threadedly connected to the first-level planetary roller 312, the first-level retaining ring 314 is fixedly arranged on the inner wall of the first-level nut 315 to fix the first-level support frame 313, the first-level push rod 316 is correspondingly installed on the first-level nut 315 by bolts, the track of the first-level guide rail 318 is arranged on the outer wall of the first-level push rod 316, and the keyway of the first-level guide rail 318 is arranged inside the first-level push rod front end cover 317;

[0044] The secondary planetary roller screw pair 32 comprises a secondary hollow screw 321, a secondary planetary roller 322, a secondary support frame 323, a secondary retaining ring 324, a secondary nut 325, a secondary push rod 326, a secondary push rod front end cover 327, and a secondary guide rail 328; a secondary support frame 323 is provided on the secondary nut 325, two ends of the secondary planetary roller 322 are respectively connected to the secondary support frame 323, the secondary planetary roller 322 is threadedly connected to the secondary nut 325, the secondary hollow screw 321 is threadedly connected to the secondary planetary roller 322, the secondary retaining ring 324 is fixedly arranged on the inner wall of the secondary nut 325 to fix the secondary support frame 323, the secondary push rod 326 is correspondingly installed on the secondary nut 325 by bolts, the track of the secondary guide rail 328 is arranged on the outer wall of the secondary push rod 326, and the keyway of the secondary guide rail 328 is arranged inside the secondary push rod front end cover 327;

[0045] The lower half of the primary lead screw 311 is a stepped shaft, which is used for positioning and installing various parts on the shaft;

[0046] The first-stage push rod 316 is hollow inside, and a through hole is provided at the center of the bottom of the push rod, so that the first-stage screw 311 passes through the first-stage push rod 316 and is sleeved inside the second-stage hollow screw 321.

[0047] The lower half of the secondary hollow lead screw 321 is a smooth axis section, and the bottom shaft end abuts against the bottom inner wall of the primary push rod 316. When the primary push rod 316 rises along the primary lead screw 311, the secondary hollow lead screw 321 also rises accordingly. The secondary hollow lead screw 321 is processed with an internal spline, which cooperates with the external spline at the top of the primary lead screw 311, so that the secondary hollow lead screw 321 rises and rotates at the same time.

[0048] The bearing group 33 includes a first bearing 331 and a second bearing 332; wherein the first bearing 331 is installed in the bearing fixing seat 421 of the electric cylinder base to support the rotational movement of the primary screw 311; the second bearing 332 is installed at the bottom end of the secondary hollow screw 321 to support the rotational movement of the secondary hollow screw 321;

[0049] The electric cylinder housing 4 includes an electric cylinder front end cover 41 and an electric cylinder housing 42; wherein the electric cylinder front end cover 41 is provided with a round hole, which cooperates with the first-stage push rod front end cover 317 to prevent dust and other impurities from entering the interior of the electric cylinder; the electric cylinder front end cover 41 and the electric cylinder housing 42 are connected by screws;

[0050] The electric cylinder housing 42 includes a bearing fixing seat 421 and an idler shaft fixing seat 422, which are used to install and position the first bearing 331 and the idler shaft 233 respectively;

[0051] The electric cylinder housing 4 is provided with radial holes for passing wires.

[0052] Working process and working principle of the present invention:

[0053] The clutch transmission assembly 2 is used to realize the switching of the working modes of controlling the synchronous rotation of two lead screws with a single motor and controlling the rotation of one lead screw with a single motor or controlling the rotation of two lead screws with two motors respectively. When the two electric cylinders need to work synchronously, the frameless torque motor rotor 12 on the left drives the primary lead screw 311 to rotate, and the primary lead screw 311 transmits the rotational motion to the driven part 22 of the electromagnetic clutch through the key connection. At this time, the coil 211 of the electromagnetic clutch is energized, and the active part 21 of the electromagnetic clutch generates a magnetic field, attracting the driven part 22 of the electromagnetic clutch to move toward the active part 21 of the electromagnetic clutch and pressing the friction plate, so that the rotational motion of the primary lead screw 311 is transmitted to the active part 21 of the electromagnetic clutch, and the active part 21 of the electromagnetic clutch is fixedly connected to the active gear 231. Through the transmission of the gear set 23, the rotational motion of the primary lead screw 311 on the left is transmitted to the primary lead screw on the right, so that the synchronous rotation of the two lead screws is realized, so that the two electric cylinder push rods are synchronously extended and retracted, and the height of the mechanism is adjusted. When only a single electric cylinder is required to work or the two electric cylinder push rods need to be extended or retracted to different lengths to adjust the pitch angle, the coil 211 of the electromagnetic clutch is de-energized. At this time, the rotational motion of the electromagnetic clutch driven part 22 will not be transmitted to the electromagnetic clutch active part 21, thereby realizing the independent operation of the two electric cylinders and flexibly dealing with different complex working conditions.

[0054] Working principle of electric cylinder: The primary screw 311 converts the rotational motion of the primary screw 311 into the linear motion of the primary nut 315 through the primary planetary roller 312. The primary nut 315 is fixedly connected to the primary push rod 316 by bolts, thereby realizing the linear motion of the primary push rod 316. The primary push rod 316 is hollow inside, and a through hole is provided at the bottom center of the primary push rod 316, so that the primary screw 311 passes through the primary push rod 316 and is sleeved inside the secondary hollow screw 321. The top of the primary screw 311 is processed with an external spline, which cooperates with the internal spline of the secondary hollow screw 321 to transmit the rotational motion of the primary screw 311 to the secondary hollow screw 321; the bottom end face of the secondary hollow screw 321 abuts against the bottom inner wall of the primary push rod 316. When the primary push rod 316 moves along As the primary lead screw 311 rises, the secondary hollow lead screw 321 also rises accordingly. The secondary hollow lead screw 321 is machined with an internal spline, which cooperates with the external spline on the top of the primary lead screw 311, so that the secondary hollow lead screw 321 rises and rotates at the same time. The rotational motion of the secondary hollow lead screw 321 is converted into linear motion of the secondary nut 325 through the secondary planetary roller 322. The secondary nut 325 is fixedly connected to the secondary push rod 326 by bolts, thereby realizing the linear motion of the secondary push rod 326.

Claims

1. A single-drive and double-drive switchable electric cylinder group, characterized in that: It comprises a motor assembly (1), a clutch transmission assembly (2), an electric cylinder assembly (3), and an electric cylinder housing (4); The motor assembly (1) comprises a frameless torque motor stator (11) and a frameless torque motor rotor (12); wherein one end of the frameless torque motor stator (11) abuts against a shaft shoulder of a primary lead screw (311) to achieve positioning of the frameless torque motor stator (11); the frameless torque motor rotor (12) is fixed to the outer wall of the primary lead screw (311) by means of structural adhesive, and is fixedly connected to the primary lead screw (311) to transmit power; The clutch transmission assembly (2) comprises an electromagnetic clutch active part (21), an electromagnetic clutch driven part (22), and a gear set (23); wherein the electromagnetic clutch active part (21) and the electromagnetic clutch driven part (22) are respectively positioned by using the shaft shoulder of the primary lead screw (311), wherein the electromagnetic clutch driven part (22) and the primary lead screw (311) are connected by a key, and rotate synchronously and transmit power; when the coil (211) of the electromagnetic clutch active part (21) is energized, a magnetic field is generated, thereby attracting the armature (221) of the electromagnetic clutch driven part (22) to overcome the elastic force of the spring (223), so that the electromagnetic clutch driven part (22) moves toward the electromagnetic clutch active part (21), and finally compresses the active friction plate (214) and the driven friction plate (222) installed between the active part and the driven part, so that the electromagnetic clutch active part (21) and the electromagnetic clutch driven part (22) rotate synchronously by friction force; The electromagnetic clutch active part (21) comprises a coil (211), an iron core (212), a sleeve (213), and an active friction plate (214); wherein the iron core (212) is used to strengthen the magnetic field, so that the clutch responds more quickly, and to strengthen the friction between the friction plates, thereby improving the transmission efficiency; the sleeve (213) is fixedly connected to the active gear (231) to transmit power; wherein the active friction plate (214) cooperates with the driven friction plate (222) to transmit power; The electromagnetic clutch driven part (22) comprises an armature (221), a driven friction plate (222), and a spring (223); wherein one end of the spring (223) is fixedly connected to the primary lead screw (311), and the other end is fixedly connected to the lower end of the electromagnetic clutch driven part (22); when the power is off, the magnetic field disappears, and the elastic force of the spring pulls the electromagnetic clutch driven part (22) back to its original position, thereby disconnecting the electromagnetic clutch driven part (22) from the electromagnetic clutch active part (21); The gear set (23) comprises a driving gear (231), an idler gear (232), an idler gear shaft (233), and a driven gear (234); wherein the driving gear (231) is fixedly connected to the sleeve (213) of the active part (21) of the electromagnetic clutch to transmit power; the driven gear (234) is connected to the primary lead screw (311) of the electric cylinder on the other side via a key to transmit power; wherein the idler gear (232) is mounted on the idler gear shaft (233), positioned via the shoulder of the idler gear shaft (233), and meshed with the driving gear (231) and the driven gear (234) respectively to achieve power transmission, while increasing the center distance between the driving gear and the driven gear, making the distance between the two electric cylinders more reasonable; The electric cylinder assembly (3) comprises a primary planetary roller screw pair (31), a secondary planetary roller screw pair (32), and a bearing assembly (33); The primary planetary roller screw pair (31) comprises a primary screw (311), a primary planetary roller (312), a primary support frame (313), a primary retaining ring (314), a primary nut (315), a primary push rod (316), a primary push rod front end cover (317), and a primary guide rail (318); a primary support frame (313) is arranged on the primary nut (315), two ends of the primary planetary roller (312) are respectively connected to the primary support frame (313), and the primary planetary roller (312) The primary screw (311) is threadedly connected to the primary nut (315), the primary lead screw (311) is threadedly connected to the primary planetary roller (312), the primary retaining ring (314) is fixedly arranged on the inner wall of the primary nut (315) to fix the primary support frame (313), the primary push rod (316) is correspondingly mounted on the primary nut (315) by bolts, the track of the primary guide rail (318) is arranged on the outer wall of the primary push rod (316), and the keyway of the primary guide rail (318) is arranged inside the front end cover (317) of the primary push rod; The secondary planetary roller screw pair (32) comprises a secondary hollow screw (321), a secondary planetary roller (322), a secondary support frame (323), a secondary retaining ring (324), a secondary nut (325), a secondary push rod (326), a secondary push rod front end cover (327), and a secondary guide rail (328); a secondary support frame (323) is arranged on the secondary nut (325), two ends of the secondary planetary roller (322) are respectively connected to the secondary support frame (323), and the secondary planetary roller (322) The secondary nut (325) is threadedly connected to the secondary hollow lead screw (321) and the secondary planetary roller (322). The secondary retaining ring (324) is fixedly arranged on the inner wall of the secondary nut (325) to fix the secondary support frame (323). The secondary push rod (326) is correspondingly mounted on the secondary nut (325) by bolts. The track of the secondary guide rail (328) is arranged on the outer wall of the secondary push rod (326). The keyway of the secondary guide rail (328) is arranged inside the front end cover (327) of the secondary push rod. The lower half of the primary lead screw (311) is a stepped shaft, which is used for positioning and installing various parts on the shaft; The first-stage push rod (316) is hollow inside, and a through hole is provided at the center of the bottom of the push rod, so that the first-stage lead screw (311) passes through the first-stage push rod (316) and is sleeved inside the second-stage hollow lead screw (321); The lower half of the secondary hollow lead screw (321) is a smooth axis section, and the bottom shaft end abuts against the bottom inner wall of the primary push rod (316). When the primary push rod (316) rises along the primary lead screw (311), the secondary hollow lead screw (321) also rises accordingly. The secondary hollow lead screw (321) is processed with an internal spline, which cooperates with the external spline at the top of the primary lead screw (311), so that the secondary hollow lead screw (321) rises and rotates at the same time. The bearing group (33) comprises a first bearing (331) and a second bearing (332); wherein the first bearing (331) is mounted in a bearing fixing seat (421) of the electric cylinder base to support the rotational movement of the primary lead screw (311); and the second bearing (332) is mounted at the bottom end of the secondary hollow lead screw (321) to support the rotational movement of the secondary hollow lead screw (321); The electric cylinder housing (4) comprises an electric cylinder front end cover (41) and an electric cylinder housing (42); wherein the electric cylinder front end cover (41) is provided with a circular hole, which cooperates with the first-stage push rod front end cover (317) to prevent dust and other impurities from entering the interior of the electric cylinder; the electric cylinder front end cover (41) and the electric cylinder housing (42) are connected by screws; The electric cylinder housing (42) comprises a bearing fixing seat (421) and an idler shaft fixing seat (422), which are used to install and position the first bearing (331) and the idler shaft (233), respectively.

2. The electric cylinder group with single-drive and double-drive switching according to claim 1, characterized in that: The electric cylinder housing (4) is provided with radial holes for passing wires.

Images