Compact electric cylinder

Abstract

The utility model relates to the field of electric cylinders, in particular to a compact electric cylinder which comprises a cylinder barrel, the cylinder barrel is sleeved with a sleeve, and the cylinder barrel is rotationally connected with the sleeve; the speed reducing mechanism is arranged on the sleeve in a sleeving manner, and the speed reducing mechanism is in transmission connection with the sleeve; and the screw rod assembly is connected with the sleeve and is positioned in the cylinder barrel. According to the electric cylinder, the cylinder barrel is sleeved with the sleeve, transmission between the speed reducing mechanism and the lead screw assembly is achieved through the sleeve, the speed reducing mechanism is arranged on one side of the barrel body part of the cylinder barrel in the axial direction of the cylinder barrel, then the axial length of the electric cylinder is shortened, and the electric cylinder can be used in a small installation space.

Description

Technical Field

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

[0002] Electric cylinders generally include motors, reducers, and screws. Existing electric cylinders are the spatial superposition of these core components.

[0003] In the existing electric cylinder, the reducer is arranged at the rear end of the cylinder body, and the gear set for deceleration in the reducer is arranged at the rear end of the cylinder body. The gears in the gear set are axially superimposed one by one on the rear end of the cylinder body and driven by the lead screw, resulting in that the electric cylinder occupies a large axial space, limiting its use in application scenarios with limited space. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing electric cylinder is bulky, which limits its use in application scenarios with limited space.

[0005] To this end, the utility model provides a compact electric cylinder.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A compact electric cylinder comprising:

[0008] drive mechanism, and

[0009] A cylinder, wherein a sleeve is sleeved on the cylinder, and the cylinder and the sleeve are rotatably connected;

[0010] A speed reduction mechanism, wherein the speed reduction mechanism is sleeved on the sleeve, and the speed reduction mechanism and the sleeve are in transmission connection;

[0011] A screw rod assembly is connected to the sleeve and is located in the cylinder.

[0012] By adopting the above technical solution, the sleeve is sleeved on the cylinder, so that the reduction mechanism can be arranged on one side of the barrel part of the cylinder along the axial direction of the cylinder, thereby shortening the axial length of the electric cylinder. The electric cylinder can be used in a smaller installation space. At the same axial length, compared with the existing electric cylinder, the stroke of the piston in the electric cylinder of this structure is increased, thereby realizing efficient linear motion in a limited space.

[0013] Furthermore, a support block is connected to the sleeve, and the screw rod assembly is connected to the support block.

[0014] Furthermore, the screw assembly includes a screw and a nut, the screw is rigidly connected to the support block, and the nut is threadably matched with the screw and moves linearly along the axial direction of the cylinder.

[0015] Furthermore, a bearing seat is connected to one end of the cylinder located in the sleeve, and the screw rod passes through the bearing seat and is rotatably connected to the bearing seat through a bearing, and the screw rod and the bearing seat rotate relative to each other.

[0016] Furthermore, the cylinder and the sleeve are rotatably connected via a first bearing, and the bearing seat and the sleeve are rotatably connected via a second bearing.

[0017] By adopting the above technical solution, the sleeve and the cylinder are rotatably connected via the first bearing and the second bearing. The first bearing and the second bearing are used to maintain the balance of the connection of the cylinder in the sleeve, reduce the wear caused by the rotation between the sleeve and the cylinder, and increase their service life.

[0018] Furthermore, the reduction mechanism includes a gear box and a reduction assembly, the reduction assembly is arranged in the gear box, and the cylinder is connected to the gear box.

[0019] Furthermore, the reduction assembly includes a first transmission wheel and a second transmission wheel, the first transmission wheel is rotatably connected in the gear box and is transmission-connected to the driving mechanism through a connecting shaft, the second transmission wheel is coaxially sleeved on the sleeve, and the first transmission wheel is meshed with the second transmission wheel.

[0020] Furthermore, it also includes a shell, which is sleeved on the sleeve and connected to the gear box.

[0021] Furthermore, it also includes a micro switch assembly, which is arranged on a side of the bearing seat facing the nut.

[0022] Furthermore, the micro switch assembly includes a micro switch and an elastic member, the micro switch is arranged on a side of the bearing seat facing the nut, and the elastic member is arranged between the nut and the micro switch.

[0023] By adopting the above technical solution, an elastic member is arranged between the micro switch and the nut. The elastic member plays a buffering role between the contact sensor between the nut and the micro switch, thereby reducing the possibility of the micro switch being damaged by the impact of the nut, and increasing the service life of the micro switch, thereby reducing the maintenance times of the micro switch, and even achieving maintenance-free use of the micro switch.

[0024] Furthermore, the micro switch assembly also includes a stop block, which is slidably disposed in the cylinder along the axial direction of the cylinder, and the stop block is located between the elastic member and the nut.

[0025] Furthermore, a mounting groove is provided at one end of the bearing seat facing the piston, a receiving groove is provided at the bottom of the mounting groove, the micro switch is arranged in the receiving groove, the elastic member and the stop block are arranged in the mounting groove, and when the elastic member is in a natural state, one end of the stop block facing the nut protrudes from the end face of the bearing seat.

[0026] Furthermore, an anti-rotation strip is connected inside the cylinder, and a limiting groove adapted to the anti-rotation strip is provided on the outer side wall of the piston.

[0027] The beneficial effect of the present invention is that by arranging a sleeve on the cylinder barrel, the reduction mechanism and the driving mechanism are arranged above the middle position of the cylinder body of the actuating mechanism, so that the driving shaft and the screw rod are arranged parallel to each other, and the transmission wheel in the reduction mechanism is directly arranged on the sleeve. Therefore, compared with the electric cylinder in the prior art in which the transmission wheel groups in the reduction mechanism are axially installed one by one at the end of the cylinder body, the electric cylinder in the present application has a more compact structure, saves installation space, and can meet the user's special installation space requirements.

[0028] An elastic member is arranged between the micro switch and the nut, and the elastic member plays a buffering role between the contact sensor between the nut and the micro switch, thereby reducing the possibility of the micro switch being damaged by the impact of the nut, and increasing the service life of the micro switch, thereby reducing the maintenance times of the micro switch, and even achieving maintenance-free use of the micro switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0030] Figure 1 It is a structural schematic diagram of a compact electric cylinder in the utility model.

[0031] Figure 2 It is used to reflect Figure 1 An enlarged view of part A showing the positional relationship between the middle sleeve and the outer shell.

[0032] Figure 3 It is used to reflect Figure 1 Enlarged view of part B of the micro switch assembly structure.

[0033] In the figure: 1. driving mechanism; 2. reduction mechanism; 20. gear box; 201. box body; 202. box cover; 203. end cover; 21. first transmission wheel; 22. second transmission wheel; 23. connecting shaft; 3. actuating mechanism; 30. cylinder body; 301. outer shell; 302. cylinder barrel; 3021. anti-rotation strip; 3022. connecting ring; 303. sleeve; 31. screw rod; 32. nut; 33. piston; 34. piston rod; 35. support block; 36. bearing seat; 361. mounting groove; 362. accommodating groove; 37. first bearing; 38. second bearing; 39. guide ring; 4. micro switch assembly; 40. micro switch; 41. elastic member; 42. stop block. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Reference Figure 1-3 A compact electric cylinder comprises a driving mechanism 1, a reduction mechanism 2 and an actuating mechanism 3, wherein the reduction mechanism 2 is arranged between the driving mechanism 1 and the actuating mechanism 3, and the reduction mechanism 2 and the driving mechanism 1 are rigidly connected as a whole.

[0038] Among them, the reduction mechanism 2 includes a gear box 20 and a reduction assembly, the reduction assembly is arranged in the gear box 20, the gear box 20 includes a box cover 202, a box body 201 and an end cover 203, the box cover 202, the box body 201 and the end cover 203 are rigidly connected, the driving mechanism 1 is rigidly connected to the box cover 202, and the end cover 203 is connected to the side of the box body 201 away from the box cover 202 and opposite to the driving mechanism 1.

[0039] The actuating mechanism 3 includes a cylinder body 30, a screw assembly and a piston rod 33, and the screw assembly includes a screw 31 and a nut 32. It should be noted that the cylinder body 30 includes a housing 301 and a cylinder barrel 302, and the housing 301 and the cylinder barrel 302 are rigidly connected to the gear box 20 through screws. The housing 301 is connected to the side of the housing 201 where the end cover 203 is provided, and the sleeve 303 is rotatably connected to the housing 301 through a guide ring 39. There are at least two guide rings 39 between the sleeve 303 and the housing 301 along the axial direction of the sleeve 303. The sleeve 303 is internally threaded with a support block 35, and the support block 35 is located at one end of the sleeve 303 away from the cylinder barrel 302, and the sleeve 303 and the support block 35 are rigidly connected through a saddle screw.

[0040] One end of the cylinder 302 passes through the gear box 20 and is coaxially inserted in the sleeve 303. The box cover 202 is rigidly connected to the outer wall of the cylinder 302 by a connecting ring 3022. The cylinder 302 and the sleeve 303 are rotatably connected by a first bearing 37. The end of the cylinder 302 located in the sleeve 303 is connected to a bearing seat 36. The end of the bearing seat 36 away from the cylinder 302 is connected to a bearing pressure cover. The bearing seat 36 and the sleeve 303 are rotatably connected by a second bearing 38. A positioning step is provided at the end of the bearing seat 36 facing the cylinder 302, and the cylinder 302 is rigidly connected to the bearing seat 36 via the positioning step.

[0041] The screw rod 31 is coaxially arranged in the cylinder 302 and rotates with the cylinder 302. One end of the screw rod 31 passes through the cylinder 302, the bearing seat 36, the bearing cover and is threadedly connected to the support block 35. The screw rod 31 is rotationally connected to the bearing seat 36 through the bearing. The screw rod 21 and the bearing seat 36 rotate relative to each other. The bearing can be a tapered roller bearing.

[0042] The nut 32 is rotatably matched with the screw rod 31 through ball bearings or trapezoidal teeth. The nut 32 can telescopically move along the rotational axial direction of the screw rod 31. The nut 32 moves linearly along the axial direction of the cylinder 302. The piston rod 33 is connected to the nut 32 through the piston 33. The piston 33 is rigidly connected to the nut 32 through screws. The piston 33 is connected to the piston rod 33 through threads. Preferably, the piston 33 and the piston rod 33 can be welded as one. The piston rod 33 is arranged in the cylinder 302 and is sleeved on the screw rod 31.

[0043] At least one anti-rotation strip 3021 is connected to the inner wall of the cylinder 302 by bolts, and the anti-rotation strip 3021 is arranged along the axial direction of the cylinder 302. A limiting groove adapted to the anti-rotation strip 3021 is opened on the outer wall of the piston 33 along the axial direction of the cylinder 302. The piston 33 drives the piston rod 33 to move linearly in the cylinder 302 along the axial direction of the cylinder 302 through the engagement between the limiting groove and the anti-rotation strip 3021.

[0044] A compact electric cylinder also includes a micro switch assembly 4, which includes a micro switch 40, an elastic member 41 and a stop block 42. Specifically, a mounting groove 361 is provided at one end of the bearing seat 36 facing the piston 33, and a receiving groove 362 is provided at the bottom of the mounting groove 361. The axial directions of the mounting groove 361 and the receiving groove 362 are evenly arranged along the axial direction of the cylinder barrel 302. The micro switch 40 is arranged in the receiving groove 362 and is fixedly connected to the bearing seat 36. The elastic member 41 is connected to the bottom of the mounting groove 361. The elastic member 41 is a wave spring. The stop block 42 is slidably arranged in the mounting groove 361 along the axial direction of the mounting groove 361. The stop block 42 is slidably connected to the inner side wall of the mounting groove 361. One end of the stop block 42 abuts against the elastic member 41, and the other end abuts against the nut 32. In the natural state of the wave spring, the end of the stop block 42 abutting against the nut 32 protrudes from the end face of the bearing seat 36.

[0045] When the nut 32 retracts into place, it will hit the stop block 42, and the stop block 42 triggers the switch to move. Because there is a wave spring in the middle, it can be compressed to a certain volume, which can limit the displacement of the stop block 42 to a certain extent, and will not cause damage to the micro switch 40 due to excessive impact and compression. Moreover, when the nut 32 drives the piston rod 33 to extend, the wave spring rebounds to reset the stop block 42.

[0046] The wave spring acts as a buffer between the contact sensor between the nut 32 and the micro switch 40, reducing the possibility of the micro switch 40 being damaged by the impact of the nut 32, and increasing the service life of the micro switch 40, thereby reducing the maintenance frequency of the micro switch 40, and even achieving maintenance-free use of the micro switch 40.

[0047] The reduction assembly includes a first transmission wheel 21, a second transmission wheel 22 and a connecting shaft 23. The connecting shaft 23 is rotatably connected in the gear box 20 and is directly connected to the driving mechanism 1. The first transmission wheel 21 is coaxially connected to the connecting shaft 23. The second transmission wheel 22 is coaxially sleeved on the sleeve 303. The second transmission wheel 22 is rigidly connected to the sleeve 303. The first transmission wheel 21 is meshed with the second transmission wheel 22.

[0048] Start the driving mechanism 1, which drives the connecting shaft 23 to rotate. Through the transmission between the first transmission wheel 21 and the second transmission wheel 22, the sleeve 303, the support block 35, and the screw rod 31 rotate. The sleeve 303 and the housing 301 rotate relative to each other. The screw rod 31 rotates in the cylinder 302, and the nut 32 drives the piston 33 and the piston rod 33 to move linearly along the axial direction of the cylinder 302.

[0049] The reduction mechanism 2 and the driving mechanism 1 are arranged above the middle position of the cylinder body 30 of the actuating mechanism 3, so that the driving shaft and the screw rod 31 are arranged parallel to each other, and the transmission wheel in the reduction mechanism 2 is directly sleeved on the sleeve 303. Compared with the electric cylinder in the prior art in which the transmission wheel groups in the reduction mechanism 2 are axially installed one by one at the end of the cylinder body 30, the electric cylinder in the present application has a more compact structure, saves installation space, and can meet the user's special installation space requirements.

[0050] To sum up, an elastic member 41 and a stop block 42 are arranged between the micro switch 40 and the nut 32, and the wave spring plays a buffering role between the contact sensor between the nut 32 and the micro switch 40, thereby reducing the possibility of the micro switch 40 being damaged by the impact of the nut 32, and increasing the service life of the micro switch 40, thereby reducing the maintenance frequency of the micro switch 40, and even achieving maintenance-free use of the micro switch 40.

[0051] The sleeve 303 is sleeved on the cylinder 302, so that the reduction mechanism can be set on one side of the barrel part of the cylinder 302 along the axial direction of the cylinder 302, thereby shortening the axial length of the electric cylinder, and the electric cylinder can be used in a smaller installation space. The transmission wheel in the reduction mechanism 2 is directly sleeved on the sleeve 303, and the support block 35 and the screw rod 31 are driven to rotate by driving the sleeve 303 to rotate. Compared with the electric cylinder in the prior art, in which the transmission wheel groups in the reduction mechanism 2 are axially installed one by one at the end of the cylinder body 30, the electric cylinder in the present application has a more compact structure, saves installation space, and can meet the user's special installation space requirements. At the same axial length, compared with the existing electric cylinder, the stroke of the piston 33 in the electric cylinder of this structure is increased, thereby achieving efficient linear motion in a limited space.

[0052] 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 compact electric cylinder, characterized in that: include, a driving mechanism (1), and A cylinder (302), wherein a sleeve (303) is sleeved on the cylinder (302), and the cylinder (302) and the sleeve (303) are rotatably connected; A speed reduction mechanism (2), wherein the speed reduction mechanism (2) is sleeved on the sleeve (303), and the speed reduction mechanism (2) and the sleeve (303) are in transmission connection; A screw rod assembly is connected to the sleeve (303) and is located in the cylinder (302).

2. The compact electric cylinder according to claim 1, characterized in that: The sleeve (303) is connected to a support block (35), and the screw rod assembly is connected to the support block (35).

3. The compact electric cylinder according to claim 2, characterized in that: The screw assembly comprises a screw (31) and a nut (32); the screw (31) is rigidly connected to a support block (35); the nut (32) is threadedly matched with the screw (31) and moves linearly along the axial direction of the cylinder (302); and a piston (33) is sleeved on the nut (32).

4. The compact electric cylinder according to claim 3, characterized in that: A bearing seat (36) is connected to one end of the cylinder (302) located inside the sleeve (303); the screw rod (31) passes through the bearing seat (36) and is rotatably connected to the bearing seat (36) via a bearing; the screw rod (31) and the bearing seat (36) rotate relative to each other.

5. The compact electric cylinder according to claim 4, characterized in that: The cylinder (302) and the sleeve (303) are rotatably connected via a first bearing (37), and the bearing seat (36) and the sleeve (303) are rotatably connected via a second bearing (38).

6. The compact electric cylinder according to claim 1, characterized in that: The speed reduction mechanism (2) comprises a gear box (20) and a speed reduction assembly, wherein the speed reduction assembly is arranged in the gear box (20), and the cylinder (302) is connected to the gear box (20).

7. The compact electric cylinder according to claim 6, characterized in that: The reduction assembly comprises a first transmission wheel (21) and a second transmission wheel (22); the first transmission wheel (21) is rotatably connected in a gear box (20) and is transmission-connected to a driving mechanism (1) via a connecting shaft (23); the second transmission wheel (22) is coaxially sleeved on a sleeve (303); the first transmission wheel (21) meshes with the second transmission wheel (22).

8. The compact electric cylinder according to claim 6, characterized in that: It also includes a housing (301), wherein the housing (301) is sleeved on the sleeve (303), and the housing (301) is connected to the gear box (20).

9. The compact electric cylinder according to claim 3, characterized in that: It also includes a micro switch assembly (4), which is arranged on a side of the bearing seat (36) facing the nut (32).

10. The compact electric cylinder according to claim 9, characterized in that: The micro switch assembly (4) comprises a micro switch (40) and an elastic member (41); the micro switch (40) is arranged on a side of the bearing seat (36) facing the nut (32); and the elastic member (41) is arranged between the nut (32) and the micro switch (40).

11. The compact electric cylinder according to claim 10, characterized in that: The micro switch assembly (4) further comprises a stopper (42), wherein the stopper (42) is slidably disposed in the cylinder barrel (302) along the axial direction of the cylinder barrel (302), and the stopper (42) is located between the elastic member (41) and the nut (32).

12. The compact electric cylinder according to claim 10, characterized in that: The bearing seat (36) is provided with a mounting groove (361) at one end facing the piston (33), and a receiving groove (362) is provided at the bottom of the mounting groove (361). The micro switch (40) is arranged in the receiving groove (362), and the elastic member (41) and the stop block (42) are arranged in the mounting groove (361). When the elastic member (41) is in a natural state, one end of the stop block (42) facing the nut (32) protrudes from the end surface of the bearing seat (36).

13. The compact electric cylinder according to claim 3, characterized in that: An anti-rotation strip (3021) is connected inside the cylinder (302), and a limiting groove adapted to the anti-rotation strip (3021) is provided on the outer side wall of the piston (33).

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