A multi-stage cylinder with stepwise thickening

Abstract

The application discloses a multi-stage cylinder with gradually thickening stages, which comprises a first screw rod, a motor for driving the first screw rod to rotate, a second screw rod with a hollow structure, the second screw rod being matched and sleeved on the first screw rod through internal threads, a nut with one end matched and installed on the second screw rod through internal threads, a fixed pipe coaxially and fixedly sleeving the outside of the screw rod and the nut, a first protective pipe coaxially sleeving the outside of the fixed pipe and being axially movable along the fixed pipe, a second protective pipe coaxially sleeving the outside of the first protective pipe and being axially movable along the first protective pipe, a front end connector for connecting a load, the front end connector being fixedly connected with the other end of the nut and one end of the second protective pipe, and the first protective pipe and the second protective pipe being axially movable when the second screw rod and the nut are axially moved to make the multi-stage cylinder elongate or shorten, so that the protection of the multi-stage cylinder is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric cylinders, and particularly relates to a multi-stage cylinder with gradually thickened stages. BACKGROUND

[0002] An electric cylinder is a new revolutionary product for realizing high-precision linear motion series by converting the rotary motion of a motor into linear motion and converting the accurate speed control, accurate number of revolutions control and accurate torque control of the motor into accurate speed control, accurate position control and accurate thrust control. At present, the traditional electric cylinder structure is single-stage screw rod transmission, and the size of the single-stage electric cylinder often cannot meet the use requirements in the occasion where the installation space is limited. SUMMARY

[0003] The application provides a multi-stage cylinder with gradually thickened stages, which has multiple protective tubes, and the diameters of the multiple protective tubes gradually increase in the direction from the power input end to the load end of the multi-stage cylinder, so that the multi-stage cylinder has better waterproof effect.

[0004] The technical scheme provided by the application is as follows:

[0005] A multi-stage cylinder with gradually thickened stages comprises:

[0006] a first screw rod;

[0007] a motor for driving the first screw rod to rotate;

[0008] a second screw rod in a hollow structure, which is matched and connected to the first screw rod through internal threads;

[0009] a nut, one end of which is matched and installed on the second screw rod through internal threads;

[0010] a fixed pipe which is coaxially fixed and sleeved outside the screw rod and the nut;

[0011] a first protective tube which is coaxially sleeved outside the fixed pipe and can move in the axial direction of the fixed pipe;

[0012] a second protective tube which is coaxially sleeved outside the first protective tube and can move in the axial direction of the first protective tube;

[0013] a front end connector for connecting a load, which is fixedly connected with the other end of the nut and one end of the second protective tube;

[0014] When the second screw rod and the nut move axially to make the multi-stage cylinder elongate or shorten, the first protective tube and the second protective tube move axially to realize protection of the multi-stage cylinder.

[0015] Preferably, a first guide groove is formed on the outer wall of the fixed pipe in the axial direction; and a first anti-rotation pin is fixedly arranged on the first protective pipe and can move in the axial direction of the first guide groove.

[0016] Preferably, a second guide groove is formed on the outer wall of the first protective pipe in the axial direction; and a second anti-rotation pin is fixedly arranged on the second protective pipe and can move in the axial direction of the second guide groove.

[0017] Preferably, the two ends of the first guide groove and the second guide groove are respectively provided with limiting portions.

[0018] Preferably, the multi-stage cylinder with gradually increasing diameters further comprises:

[0019] A first screw rod guide support seat is fixedly installed on the first screw rod at one end close to the front end joint;

[0020] A first screw rod guide support bearing is sleeved on the first screw rod guide support seat, and the outer ring of the first screw rod guide support bearing is supported on the inner wall of the second screw rod.

[0021] Preferably, one end of the second screw rod is connected to the first screw rod through internal threads, and the other end is provided with a second screw rod guide support seat;

[0022] The second screw rod guide support seat is sleeved with a second guide support bearing, and the outer ring of the second guide support bearing is supported on the inner wall of the nut.

[0023] Preferably, a first end cover is fixedly connected to one end of the first protective pipe away from the front end joint, and a first sealing ring and a first protective pipe guide bearing are installed on the inner wall of the first end cover.

[0024] Preferably, a second end cover is fixedly connected to the other end of the second protective pipe, and a second sealing ring and a second protective pipe guide bearing are installed on the inner wall of the second end cover.

[0025] Preferably, a front end cover plate is integrated on the front end joint, which simultaneously blocks the end opening of the nut and the second protective pipe and is fixedly connected to the end of the nut and the second protective pipe.

[0026] The beneficial effects of the present application are:

[0027] The multi-stage cylinder with gradually increasing diameters provided by the present application has smaller shrinkage size and larger elongation size; and the diameters of the multiple protective pipes gradually increase in the direction from the power input end to the load end of the multi-stage cylinder, which can make the multi-stage cylinder have better waterproof effect. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 This is a schematic diagram of the overall structure of the multi-stage cylinder with progressively thicker cylinders as described in this invention.

[0029] Fig. 2 This is a cross-sectional schematic diagram of the multi-stage cylinder with progressively thicker sections as described in this invention, along the direction of the first guide groove. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0031] like Figs. 1-2 As shown, the present invention provides a multi-stage cylinder with progressively thicker diameters, comprising: a motor 1, a reducer 2, a gearbox 3, a drive wheel 4, a gearbox cover 5, an auxiliary bearing 6, a driven wheel 7, a bearing lock nut 8, a main bearing 9, a bearing chamber 10, a first lead screw 11, a stationary tube clamping nut 12, a first sealing ring 13, a first end cap 14, a first protective tube guide bearing 15, a first protective tube 16, a second sealing ring 17, a second protective tube guide bearing 18, a second end cap 19, a second anti-rotation pin 20, a second protective tube 21, a second lead screw 22, a nut 23, a stationary tube 24, a first guide groove 25, a first lead screw guide support seat 26, a first lead screw guide support bearing 27, a first lead screw guide support pressure block 28, a second lead screw guide support seat 29, a second guide support bearing 30, a second lead screw guide support pressure block 31, a front end cover plate 32, screws 33 and 34, a first anti-rotation pin 35, a lower fish ear 36, a second guide groove 37, and a front end connector 38.

[0032] The reducer 2 is a speed reduction and torque amplification structure, and its input end is connected to the output shaft of the motor 1. The motor 1 can be a servo motor, a three-phase asynchronous motor, or a DC motor, etc. In this embodiment, the reducer 2 is a planetary reducer. The driving wheel 4 is a gear structure, connected to the output shaft of the reducer 2 via a key. The reducer 2 reduces the motion of the motor 1 and then transmits it to the driving wheel 4. The driven wheel 7 is a gear structure, meshing with the driving wheel 4. The driven wheel 7 is connected to one end of the first lead screw 11 via a key, transmitting motion and power to the first lead screw 11. The gearbox 3 covers the driving wheel 4 and the driven wheel 7, accommodating them. The housing of the reducer 2 is fixedly mounted on the right end plate of the gearbox 3. The gearbox cover 5 is installed on the left end of the gearbox 3 for sealing. Two auxiliary bearings 6 are installed inside the gearbox cover 5, and an integrated lower fish-ear 36 is provided on its outer side. The lower fish ear 36 is used to fix the multi-stage cylinder and unload the load onto the external frame. Among them, two auxiliary bearings 6 are respectively set with the driving wheel 4 and the driven wheel 7, and are used to position and support the driving wheel 4 and the driven wheel 7.

[0033] The bearing chamber 10 is fixedly connected at one end of the gear box 3, and the main bearing 9 is installed in the bearing chamber.

[0034] The first screw rod 11 is rotatably supported in the main bearing 9, wherein the bearing chamber 10 is used for supporting and protecting the main bearing 9. The bearing lock nut 8 is installed in the bearing chamber 10 and is used for locking the inner ring of the main bearing 9. The main bearing 9 bears external load thrust or tension. The first screw rod 11 can be a trapezoidal screw rod, a ball screw rod or a roller screw rod. The first screw rod 11 transmits the final load to the main bearing 9, and then unloads the force through the bearing chamber 10, the gear box 3, the gear box cover 5 and the lower fish ear 36.

[0035] The second screw rod 22 is a hollow structure, and the left end of the second screw rod 22 is internally threaded and is matched and sleeved on the first screw rod 11. Meanwhile, the second screw rod 22 is externally threaded, and the left end of the nut 23 is internally threaded and is matched and installed on the second screw rod 22.

[0036] The first screw rod guide support seat 26 is fixedly installed on one end of the first screw rod 11 close to the front end joint 38. The first screw rod guide support bearing 27 is sleeved on the first screw rod guide support seat 26, and the outer ring of the first screw rod guide support bearing 27 is supported on the inner wall of the second screw rod 22. The first screw rod guide support pressing block 28 is screwed on the right end of the first screw rod 11 by threads and is used for pressing the first screw rod guide support seat 26. The first screw rod guide support bearing 27 is arranged and used for supporting the first screw rod 11.

[0037] As a preferred, the right end of the second screw rod 22 is provided with the second screw rod guide support seat 29; the second guide support bearing 30 is sleeved on the second screw rod guide support seat 29, and the outer ring of the second guide support bearing 30 is supported on the inner wall of the nut 23. The second screw rod guide support pressing block 31 is screwed on the right end of the second screw rod 22 by threads and is used for pressing the second screw rod guide support seat 29. The second guide support bearing 30 is arranged and used for supporting the second screw rod 22.

[0038] The fixed pipe 24 is coaxially sleeved outside the first screw rod 11, the second screw rod 22 and the nut 23; one end of the fixed pipe 24 is connected with the bearing chamber 10, and the first guide groove 25 is formed in the outer wall of the fixed pipe 24 in the axial direction. The fixed pipe clamping nut 12 is used for locking the fixed pipe 24 and can adjust the direction of the fixed pipe 24, that is, adjust the direction of the first guide groove 25.

[0039] The first protective pipe 16 is coaxially sleeved outside the fixed pipe 24 and is used for protecting the multi-stage cylinder; the first protective pipe 16 can move in the axial direction of the fixed pipe 24. The first anti-rotation pin 35 is installed on the first protective pipe 16 by threads, the first anti-rotation pin 35 can move along the first guide groove 25 and plays a role of anti-rotation.

[0040] The second protective pipe 21 is coaxially sleeved outside the first protective pipe 16, is used for protecting the multi-stage cylinder, and can move axially along the first protective pipe 16. Wherein, the outer wall of the first protective pipe 16 is provided with a second guide groove 37 in the axial direction; the second protective pipe 21 is provided with a second anti-rotation pin 20 which is installed through screw thread, and the second anti-rotation pin 20 can move along the second guide groove 37, and plays an anti-rotation role.

[0041] Wherein, the two ends of the first guide groove 25 and the second guide groove 37 are respectively provided with limit portions, which are used for limiting the moving range of the first protective pipe 16 and the second protective pipe 21.

[0042] The front end connector 38 is used for connecting the load; the front end connector 38 is fixedly connected with the other end (right end) of the nut 23 and one end (right end) of the second protective pipe 21. Wherein, when the multi-stage cylinder is elongated or shortened by the axial movement of the second screw rod 22 and the nut 23, the first protective pipe 16 and the second protective pipe 21 move axially, and the protection of the multi-stage cylinder is realized.

[0043] In the embodiment, the front end connector 38 is integrated with a front end cover plate 32, the front end cover plate 32 seals the end opening of the nut 23 and the second protective pipe 21 at the same time, and is fixedly connected with the end of the nut 23 and the second protective pipe 21 at the same time.

[0044] The first end cover 14 is arranged on the end of the first protective pipe 16 away from the front end connector 38 (the left end of the first protective pipe 16), and the first end cover 14 is connected on the first protective pipe 16 through screw, and the inner wall of the first end cover 14 is provided with the first sealing ring 13 and the first protective pipe guide bearing 15. The first sealing ring 13 can prevent the outside dust and water from entering the inside of the multi-stage cylinder, so that the inside of the multi-stage cylinder always keeps a clean environment, because the entry of impurities or water may cause the rapid wear of the screw rod and the nut, and then the multi-stage cylinder is scrapped. The first protective pipe guide bearing 15 is used for guiding the first protective pipe 16.

[0045] The left end of the second protective pipe 21 is fixedly connected with the second end cover 19 through screw, and the inner wall of the second end cover 19 is provided with the second sealing ring 17 and the second protective pipe guide bearing 18. The second sealing ring 17 prevents the outside dust and water from entering the inside of the multi-stage cylinder, so that the inside of the multi-stage cylinder always keeps a clean environment, because the entry of impurities or water may cause the rapid wear of the screw rod and the nut, and then the multi-stage cylinder is scrapped. The second protective pipe guide bearing 18 is used for guiding the movement of the second protective pipe.

[0046] The working process of the multi-stage cylinder with gradually thickening stages provided by the application is as follows:

[0047] The motor 1 is energized, the motor shaft rotates, the motor shaft transmits the motion to the planetary reducer 2 through the hoop or the key, the output shaft of the planetary reducer 2 starts to rotate, then the driven wheel 7 is driven to rotate through the key on the output shaft. The driven wheel 7 transmits the motion to the first lead screw 11 through the key, the first lead screw 11 rotates, the second lead screw 22 is provided with internal threads matched with the external threads of the first lead screw 11, at this time, the second lead screw 22 will do linear motion, until the internal thread end of the second lead screw 22 contacts the first lead screw guide support seat 26, at this time, the linear motion of the second lead screw is limited, but the first lead screw 11 still rotates, at this time, the second lead screw 22 will rotate with the first lead screw 11, the second nut 23 will do linear motion, at the same time, the front end joint 38 connected with the second nut 23 does linear motion.

[0048] The fixed pipe 24 is fixed on the bearing chamber 10 through threads, the fixed pipe 24 cannot rotate, and is provided with the first guide groove 25 and the first anti-rotation pin 35, the first guide groove 25 is screwed on the first guide pipe 16, and moves along the first guide groove 25 on the fixed pipe 24, the first guide pipe 16 also cannot rotate, the second anti-rotation pin 20 is screwed on the second guide pipe 21, and moves along the second guide groove 37 on the first guide pipe 16, to play the anti-rotation role.

[0049] The multi-stage cylinder retraction process is the reverse process of the above process, which will not be repeated here.

[0050] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, it can be fully applied to various fields suitable for the present application, and other modifications can be easily realized by those skilled in the art, therefore, the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A multi-stage cylinder with progressively increasing coarseness, characterized in that, include: First lead screw; The motor drives the first lead screw to rotate; The motor is a servo motor, a three-phase asynchronous motor, or a DC motor. The second lead screw has a hollow structure and is fitted onto the first lead screw via an internal thread. A nut, one end of which is fitted onto the second lead screw via an internal thread; The stationary tube is coaxially fixed and loosely sleeved on the outside of the lead screw and the nut; The first protective tube is coaxially sleeved on the outside of the stationary tube and is capable of moving along the axial direction of the stationary tube; The second protective tube is coaxially sleeved on the outside of the first protective tube and can move along the axial direction of the first protective tube; A front connector is used to connect a load; the front connector is simultaneously and fixedly connected to the other end of the nut and one end of the second protective tube. When the second lead screw and the nut move axially to extend or shorten the multi-stage cylinder, the first protective tube and the second protective tube move axially to protect the multi-stage cylinder. The first protective tube has a second guide groove axially formed on its outer wall; the second protective tube is fixedly provided with a second anti-rotation pin, which can move axially along the second guide groove. A first lead screw guide support is fixedly installed on the first lead screw at one end near the front end connector; The first lead screw guide support bearing is mounted on the first lead screw guide support seat, and the outer ring of the first lead screw guide support bearing is supported on the inner wall of the second lead screw. A first end cap is fixedly connected to the end of the first protective tube away from the front end connector, and a first sealing ring and a first protective tube guide bearing are installed on the inner wall of the first end cap.

2. The multi-stage cylinder with progressively coarser diameters according to claim 1, characterized in that, A first guide groove is provided on the outer wall of the stationary tube along the axial direction; a first anti-rotation pin is fixedly provided on the first protective tube, and the first anti-rotation pin can move axially along the first guide groove.

3. The multi-stage cylinder with progressively coarser diameters according to claim 2, characterized in that, The first guide groove and the second guide groove each have a limiting part at both ends.

4. The multi-stage cylinder with progressively coarser diameters according to claim 3, characterized in that, One end of the second lead screw is connected to the first lead screw via an internal thread, and the other end is equipped with a second lead screw guide support seat; The second lead screw guide support seat is fitted with a second guide support bearing, and the outer ring of the second guide support bearing is supported on the inner wall of the nut.

5. The multi-stage cylinder with progressively coarser diameters according to claim 4, characterized in that, The other end of the second protective tube is fixedly connected to a second end cap, and a second sealing ring and a second protective tube guide bearing are installed on the inner wall of the second end cap.

6. The multi-stage cylinder with progressively coarser diameters according to claim 5, characterized in that, The front end connector is integrated with a front end cover plate, which simultaneously blocks the end openings of the nut and the second protective tube, and is fixedly connected to the ends of the nut and the second protective tube.

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