Precise secondary bevel gear electric cylinder

Abstract

The utility model relates to the field of electric cylinders, in particular to a precise two-stage bevel gear electric cylinder. The device comprises a mounting assembly, a second-stage screw rod, an outer cylinder barrel, a first-stage telescopic assembly, a second-stage telescopic assembly, a connecting seat and a driving mechanism, a first-stage screw rod is rotationally mounted on the mounting assembly and is provided with an external spline; the outer cylinder barrel is arranged at the top of the mounting assembly; the first-stage telescopic assembly is in threaded connection with the first-stage lead screw and is arranged on the outer air cylinder barrel in the vertical direction in a sliding mode. The second-stage screw rod is of a hollow structure, is provided with an internal spline matched with the external spline and is arranged on the first-stage screw rod in a sleeving manner; the second-stage telescopic assembly is in threaded connection with the second-stage lead screw and is arranged on the first-stage telescopic assembly in the vertical direction in a sliding mode. The connecting base is connected to the top end of the second-stage telescopic assembly. The driving mechanism is used for driving the first-stage lead screw to rotate. The two-stage electric cylinder can achieve two-stage transmission, and the stroke obtained by the two-stage electric cylinder is far larger than the stroke obtained by a single-stage electric cylinder in the same installation space.

Description

Technical Field

[0001] The utility model relates to the field of electric cylinders, in particular to a precision two-stage bevel gear electric cylinder. Background Art

[0002] An electric cylinder is a mechanism that converts the rotary motion of a servo motor into the linear motion of a piston rod. It is widely used in the fields of medical, aerospace, industrial automation, etc. At present, most electric cylinders on the market are single-stage transmissions, which are limited in use in places where small installation space requirements and long actual output strokes are required. For example, the initial installation length of a single-stage electric cylinder is L, and its maximum stroke must be less than L. Utility Model Content

[0003] The utility model aims to solve the problems existing in the background technology and proposes a precision two-stage bevel gear electric cylinder to realize two-stage transmission. In the same installation space, the stroke obtained by the two-stage electric cylinder is much greater than the stroke of the single-stage electric cylinder.

[0004] The technical solution of the utility model is a precision two-stage bevel gear electric cylinder, comprising a mounting assembly, a two-stage screw, an outer cylinder barrel, a first-stage telescopic assembly, a second-stage telescopic assembly, a connecting seat and a driving mechanism; a first-stage screw is rotatably mounted on the mounting assembly, and the first-stage screw has an external spline; the outer cylinder barrel is arranged on the top of the mounting assembly; the first-stage telescopic assembly is threadedly connected to the first-stage screw and is vertically slidably arranged on the outer cylinder barrel; the second-stage screw is a hollow structure, has an internal spline adapted to the external spline, and is sleeved on the first-stage screw; the second-stage telescopic assembly is threadedly connected to the second-stage screw and is vertically slidably arranged on the first-stage telescopic assembly; the connecting seat is connected to the top of the second-stage telescopic assembly; the driving mechanism is used to drive the first-stage screw to rotate.

[0005] Preferably, the mounting assembly includes a base, a housing, a machine cover and a transition flange connected in sequence from bottom to top, and a guide copper sleeve arranged on the machine cover and rotatably connected to the primary screw; a locking nut a is connected to the bottom end of the primary screw, a tapered roller bearing b is installed between the housing and the primary screw, and a skeleton oil seal b is connected to the primary screw.

[0006] Preferably, the driving mechanism includes a servo motor, an angular planetary reducer, a bearing chamber, a driving bevel gear and a driven bevel gear. The output end of the servo motor is connected to the input end of the angular planetary reducer, the output end of the angular planetary reducer is connected to the driving bevel gear, the driving bevel gear is meshed with the driven bevel gear, a tapered roller bearing a is installed between the driving bevel gear and the bearing chamber, the two ends of the bearing chamber are respectively connected to the angular planetary reducer and the housing, a flat key is connected between the driven bevel gear and the skeleton oil seal b, and the driven bevel gear is coaxially distributed with the primary screw.

[0007] Preferably, a skeleton oil seal a is provided between the bearing chamber and the active bevel gear, and a shaft elastic retaining ring a is provided between the active bevel gear and the side surface of the tapered roller bearing a.

[0008] Preferably, the first-level telescopic assembly includes a first-level nut, a nut seat, a guide ring and a first-level piston rod. The first-level nut is threadedly connected to the first-level screw rod. The first-level nut is arranged on the nut seat. The nut seat is arranged on the inner side of the outer cylinder barrel through the guide ring. A thrust ball bearing is installed between the nut seat and the second-level screw rod. A tapered roller bearing c is installed between the second-level screw rod and the first-level piston rod. The first-level piston rod is connected to the nut seat. A keyway a is axially arranged on the inner wall of the outer cylinder barrel. A guide key a is arranged on the outer peripheral surface of the nut seat. The guide key a is slidably connected to the keyway a.

[0009] Preferably, the secondary telescopic assembly includes a secondary nut and a secondary piston rod. The secondary nut is threadedly connected to the secondary screw rod, and the secondary nut is connected to the secondary piston rod. A keyway b is axially arranged on the outer peripheral surface of the secondary nut, and a guide key b is axially connected on the inner side surface of the primary piston rod. The guide key b is slidably connected to the keyway b.

[0010] Preferably, a front support seat a is connected to the top of the outer cylinder barrel, a dust ring a and a guide belt are connected between the front support seat a and the primary piston rod, a deep groove ball bearing is installed on the top of the secondary piston rod, an elastic retaining ring b for the shaft is connected between the secondary piston rod and the side of the deep groove ball bearing, the deep groove ball bearing is connected to a secondary screw guide seat, a phenolic cloth guide ring is connected between the secondary screw guide seat and the secondary piston rod, the front support seat b is connected to the top of the primary piston rod, and a dust ring b is connected between the front support seat b and the secondary piston rod.

[0011] Preferably, the connecting seat includes a joint, a locking nut b and a flange which are sequentially connected from bottom to top, and the joint is connected to the top end of the secondary piston rod.

[0012] Compared with the prior art, the utility model has the following beneficial technical effects:

[0013] The utility model can realize two-stage transmission. In the same installation space, the stroke of the two-stage electric cylinder is much greater than that of the single-stage electric cylinder. The two-stage lifting of the two-stage piston rod is realized by the rotation of the first-stage screw rod and the rotary lifting of the second-stage screw rod, thereby realizing the two-stage lifting of the connecting seat, so that the stroke of the entire electric cylinder is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front structural sectional view of an embodiment of the utility model;

[0015] Figure 2 for Figure 1 AA section view in the figure;

[0016] Figure 3for Figure 1 A magnified view of the structure at point B.

[0017] Figure numerals: 1, servo motor; 2, angular planetary reducer; 3, skeleton oil seal a; 4, bearing chamber; 5, shaft elastic ring a; 6, tapered roller bearing a; 7, driving bevel gear; 8, base; 9, housing; 10, locking nut a; 11, primary screw rod; 12, tapered roller bearing b; 13, driven bevel gear; 14, flat key; 15, skeleton oil seal b; 16, machine cover; 17, transition flange; 18, guide copper sleeve; 19, primary nut; 20, nut seat; 21, guide ring; 22, thrust ball shaft Bearing; 23. Tapered roller bearing c; 24. Secondary screw; 25. Secondary nut; 26. Outer cylinder; 271. Guide key a; 272. Guide key b; 28. Secondary piston rod; 29. ​​Primary piston rod; 30. Front support seat a; 31. Dust ring a; 32. Phenolic cloth guide ring; 33. Deep groove ball bearing; 34. Guide belt; 35. Secondary screw guide seat; 36. Elastic retaining ring b for shaft; 37. Front support seat b; 38. Dust ring b; 39. Joint; 40. Lock nut b; 41. Flange. DETAILED DESCRIPTION

[0018] Embodiment 1

[0019] like Figure 1-Figure 3 As shown, the precision two-stage bevel gear electric cylinder proposed in this embodiment includes a mounting assembly, a two-stage screw rod 24, an outer cylinder barrel 26, a first-stage telescopic assembly, a second-stage telescopic assembly, a connecting seat and a driving mechanism.

[0020] A primary screw rod 11 is rotatably mounted on the mounting assembly, and the primary screw rod 11 has an external spline. The driving mechanism is used to drive the primary screw rod 11 to rotate.

[0021] The first-level telescopic assembly is threadedly connected to the first-level screw rod 11 and is vertically slidably arranged on the outer cylinder barrel 26; the first-level telescopic assembly includes a first-level nut 19, a nut seat 20, a guide ring 21 and a first-level piston rod 29, the first-level nut 19 is threadedly connected to the first-level screw rod 11, the first-level nut 19 is arranged on the nut seat 20, the nut seat 20 is arranged on the inner side of the outer cylinder barrel 26 through the guide ring 21, the guide ring 21 slides on the inner wall of the outer cylinder barrel 26, a thrust ball bearing 22 is installed between the nut seat 20 and the second-level screw rod 24, a tapered roller bearing c23 is installed between the second-level screw rod 24 and the first-level piston rod 29, the first-level piston rod 29 is connected to the nut seat 20, a keyway a is axially arranged on the inner wall of the outer cylinder barrel 26, a guide key a271 is arranged on the outer peripheral surface of the nut seat 20, and the guide key a271 is slidably connected to the keyway a to guide the vertical movement of the first-level piston rod 29. When the primary screw rod 11 rotates, it drives the primary nut 19 to rise and fall, the primary nut 19 drives the nut seat 20 to rise and fall, and the nut seat 20 drives the primary piston rod 29 to rise and fall.

[0022] The secondary screw rod 24 is a hollow structure with an internal spline that matches the external spline, and is mounted on the primary screw rod 11. When the primary screw rod 11 rotates, it can drive the secondary screw rod 24 to rotate. The secondary screw rod 24 will also rise and fall with the nut seat 20, thereby realizing the rotational lifting of the secondary screw rod 24.

[0023] The secondary telescopic assembly is threadedly connected to the secondary screw 24 and is slidably arranged on the primary telescopic assembly in the vertical direction; the secondary telescopic assembly includes a secondary nut 25 and a secondary piston rod 28, the secondary nut 25 is threadedly connected to the secondary screw 24, the secondary nut 25 is connected to the secondary piston rod 28, a keyway b is axially arranged on the outer peripheral surface of the secondary nut 25, a guide key b272 is axially connected on the inner side surface of the primary piston rod 29, and the guide key b272 is slidably connected to the keyway b. When the secondary screw 24 moves, it can drive the secondary nut 25 to rise and fall, and the secondary nut 25 drives the secondary piston rod 28 to rise and fall, and the guide key b272 is used to ensure that the secondary piston rod 28 rises and falls vertically, and the secondary piston rod 28 is superimposed on the primary piston rod 29 for lifting and falling, and the travel range is large.

[0024] The connecting seat is connected to the top of the secondary telescopic assembly. The connecting seat includes a joint 39, a locking nut b40 and a flange 41 connected in sequence from bottom to top. The joint 39 is connected to the top of the secondary piston rod 28. The flange 41 is used to connect to the target structure to be driven, and can drive the target structure to move linearly.

[0025] The outer cylinder barrel 26 is arranged at the top of the mounting assembly. The cross section of the outer cylinder barrel 26 is square, and there are through holes at the four corners, which are convenient for connection with other components after tapping. The top of the outer cylinder barrel 26 is connected with a front support seat a30, and a dust ring a31 and a guide belt 34 are connected between the front support seat a30 and the primary piston rod 29. The primary piston rod 29 slides on the guide belt 34. A deep groove ball bearing 33 is installed on the top of the secondary piston rod 28. A shaft elastic retaining ring b36 is connected between the secondary piston rod 28 and the side of the deep groove ball bearing 33. The deep groove ball bearing 33 is connected with a secondary screw guide seat 35. A phenolic cloth guide ring 32 is connected between the secondary screw guide seat 35 and the secondary piston rod 28. The outer circle of the phenolic cloth guide ring 32 matches the inner hole of the secondary piston rod 28 to ensure the stability of the extension and retraction of the secondary screw rod 24. The top end of the primary piston rod 29 is connected to a front support seat b37 , and a dust ring b38 is connected between the front support seat b37 and the secondary piston rod 28 .

[0026] This embodiment can realize two-stage transmission. In the same installation space, the stroke of the two-stage electric cylinder is much greater than that of the single-stage electric cylinder. On the one hand, the first-stage screw rod 11 rotates under the driving action of the driving mechanism, and the first-stage screw rod 11 realizes the lifting and lowering of the first-stage piston rod 29 through the first-stage telescopic assembly; on the other hand, the first-stage screw rod 11 drives the second-stage screw rod 24 to perform rotary lifting. The second-stage screw rod 24 uses rotary motion to realize the lifting and lowering of the second-stage piston rod 28 through the second-stage telescopic assembly. The second-stage piston rod 28 drives the lifting and lowering of the connecting seat. By superimposing the lifting and lowering of the first-stage piston rod 29 and the second-stage piston rod 28, the second-stage lifting and lowering of the connecting seat can be realized, so that the stroke of the entire electric cylinder is increased, and the effective stroke is greater than or equal to its initial installation length.

[0027] Embodiment 2

[0028] Compared with the first embodiment, the precision two-stage bevel gear electric cylinder proposed in this embodiment has the following advantages: Figure 1 As shown, the installation assembly includes a base 8, a box body 9, a machine cover 16 and a transition flange 17 connected in sequence from bottom to top, and a guide copper sleeve 18 arranged on the machine cover 16 and rotatably connected to the primary screw 11. The inner hole of the guide copper sleeve 18 and the outer diameter of the primary screw 11 are matched with a small gap to improve the stability of the primary screw 11 when moving and reduce shaking. A locking nut a10 is connected to the bottom end of the primary screw 11, a tapered roller bearing b12 is installed between the box body 9 and the primary screw 11, and a skeleton oil seal b15 is connected to the primary screw 11 to ensure sealing.

[0029] The driving mechanism includes a servo motor 1, an angular planetary reducer 2, a bearing chamber 4, a driving bevel gear 7 and a driven bevel gear 13. The output end of the servo motor 1 is connected to the input end of the angular planetary reducer 2, the output end of the angular planetary reducer 2 is connected to the driving bevel gear 7, the driving bevel gear 7 is meshed with the driven bevel gear 13, a tapered roller bearing a6 is installed between the driving bevel gear 7 and the bearing chamber 4, the two ends of the bearing chamber 4 are respectively connected to the angular planetary reducer 2 and the housing 9, a flat key 14 is connected between the driven bevel gear 13 and the skeleton oil seal b15, and the driven bevel gear 13 is coaxially distributed with the primary screw 11. The servo motor 1 drives the driving bevel gear 7 to rotate through the angular planetary reducer 2, the driving bevel gear 7 drives the driven bevel gear 13 to rotate, and the driven bevel gear 13 drives the primary screw 11 to rotate through the flat key 14 and the skeleton oil seal b15. The output end of the servo motor 1 can rotate forward and reverse, and the primary screw 11 can rotate forward and reverse, which can realize the extension and retraction of the entire electric cylinder.

[0030] A skeleton oil seal a3 is provided between the bearing chamber 4 and the active bevel gear 7 to ensure sealing performance. A shaft elastic retaining ring a5 is provided between the active bevel gear 7 and the side of the tapered roller bearing a6 to ensure position stability.

[0031] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. Precision two-stage bevel gear electric cylinder, characterized in that: include: A mounting assembly on which a primary screw rod (11) is rotatably mounted, wherein the primary screw rod (11) has an external spline; An outer cylinder barrel (26) disposed on top of the mounting assembly; A first-stage telescopic assembly, which is threadedly connected to the first-stage screw rod (11) and is vertically slidably disposed on the outer cylinder barrel (26); The secondary screw rod (24) is a hollow structure, has an internal spline adapted to the external spline, and is sleeved on the primary screw rod (11); A secondary telescopic assembly, which is threadedly connected to the secondary screw rod (24) and is slidably arranged on the primary telescopic assembly along a vertical direction; A connecting seat connected to the top of the secondary telescopic assembly; A driving mechanism for driving the primary screw rod (11) to rotate.

2. The precision two-stage bevel gear electric cylinder according to claim 1, characterized in that: The mounting assembly comprises a base (8), a housing (9), a machine cover (16) and a transition flange (17) which are connected in sequence from bottom to top, and a guide copper sleeve (18) which is arranged on the machine cover (16) and is rotatably connected to a primary screw rod (11); a locking nut a (10) is connected to the bottom end of the primary screw rod (11); a tapered roller bearing b (12) is installed between the housing (9) and the primary screw rod (11); and a skeleton oil seal b (15) is connected to the primary screw rod (11).

3. The precision two-stage bevel gear electric cylinder according to claim 2, characterized in that: The driving mechanism comprises a servo motor (1), an angular planetary reducer (2), a bearing chamber (4), a driving bevel gear (7) and a driven bevel gear (13); the output end of the servo motor (1) is connected to the input end of the angular planetary reducer (2); the output end of the angular planetary reducer (2) is connected to the driving bevel gear (7); the driving bevel gear (7) is meshedly connected to the driven bevel gear (13); a tapered roller bearing a (6) is installed between the driving bevel gear (7) and the bearing chamber (4); two ends of the bearing chamber (4) are respectively connected to the angular planetary reducer (2) and a housing (9); a flat key (14) is connected between the driven bevel gear (13) and a skeleton oil seal b (15); and the driven bevel gear (13) is coaxially distributed with a primary screw (11).

4. The precision two-stage bevel gear electric cylinder according to claim 3 is characterized in that: A skeleton oil seal a (3) is arranged between the bearing chamber (4) and the driving bevel gear (7), and a shaft elastic retaining ring a (5) is arranged between the driving bevel gear (7) and the side surface of the tapered roller bearing a (6).

5. The precision two-stage bevel gear electric cylinder according to claim 1, characterized in that: The first-stage telescopic assembly comprises a first-stage nut (19), a nut seat (20), a guide ring (21) and a first-stage piston rod (29). The first-stage nut (19) is threadedly connected to the first-stage screw rod (11). The first-stage nut (19) is arranged on the nut seat (20). The nut seat (20) is arranged on the inner side of the outer cylinder barrel (26) through the guide ring (21). A thrust ball bearing (22) is installed between the nut seat (20) and the second-stage screw rod (24). A tapered roller bearing c (23) is installed between the second-stage screw rod (24) and the first-stage piston rod (29). The first-stage piston rod (29) is connected to the nut seat (20). A keyway a is axially arranged on the inner wall of the outer cylinder barrel (26). A guide key a (271) is arranged on the outer peripheral surface of the nut seat (20). The guide key a (271) is slidably connected to the keyway a.

6. The precision two-stage bevel gear electric cylinder according to claim 5, characterized in that: The secondary telescopic assembly comprises a secondary nut (25) and a secondary piston rod (28). The secondary nut (25) is threadedly connected to the secondary screw rod (24). The secondary nut (25) is connected to the secondary piston rod (28). A keyway b is axially arranged on the outer peripheral surface of the secondary nut (25). A guide key b (272) is axially connected to the inner side surface of the primary piston rod (29). The guide key b (272) is slidably connected to the keyway b.

7. The precision two-stage bevel gear electric cylinder according to claim 1, characterized in that: The top of the outer cylinder barrel (26) is connected to a front support seat a (30), a dust ring a (31) and a guide belt (34) are connected between the front support seat a (30) and the primary piston rod (29), a deep groove ball bearing (33) is installed on the top of the secondary piston rod (28), an elastic retaining ring b (36) for the shaft is connected between the secondary piston rod (28) and the side of the deep groove ball bearing (33), the deep groove ball bearing (33) is connected to a secondary screw guide seat (35), a phenolic cloth guide ring (32) is connected between the secondary screw guide seat (35) and the secondary piston rod (28), the top of the primary piston rod (29) is connected to a front support seat b (37), and a dust ring b (38) is connected between the front support seat b (37) and the secondary piston rod (28).

8. The precision two-stage bevel gear electric cylinder according to claim 1, characterized in that: The connecting seat comprises a joint (39), a locking nut b (40) and a flange (41) which are sequentially connected from bottom to top, and the joint (39) is connected to the top end of the secondary piston rod (28).

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