Electric cylinder suitable for marine environment

Abstract

The invention provides an electric cylinder suitable for a marine environment, the electric cylinder comprises a shell assembly, a power transmission device and a precision conversion device, the power transmission device is arranged on the shell assembly, and the power transmission device comprises an inner spline sleeve connected with the shell assembly; the ball nut and the lead screw are arranged in the inner spline sleeve; the ball nut is fixedly connected with the output shaft and can push the output shaft to output displacement; and the motor is fixed on the inner spline sleeve and is in driving connection with the lead screw through a precision conversion device. The self-locking hydraulic cylinder has the functions of self-locking, sealing reliability, repeated positioning precision and self-health management under the ocean water pressure environment, is small in size, light in weight, high in reliability and good in maintainability, can effectively improve the accessibility of operators, promotes the transformation of a full-electrochemical system, and thoroughly solves the problem that the ocean environment is polluted due to leakage of hydraulic oil of the hydraulic cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of design of electric equipment for a ship missile propulsion system, and in particular to an electric cylinder suitable for a marine environment. Background Art

[0002] The electric cylinder is an important device for the full electrification of the ship missile propulsion system, and provides a high-sealing actuator for linear motion and thrust in the marine environment. As a mechatronic product, the electric cylinder has the advantages of high precision, high efficiency, easy maintenance, and small size. It integrates the self-locking function, dynamic and static sealing performance, high-precision control function, and speed and torque output. It solves the problems of low precision, difficult operation and maintenance, and hydraulic oil leakage of hydraulic cylinders that pollute the environment, and realizes digital control of system integration. It can be widely used in linear motion structures that need to perform thrust in harsh environments. Summary of the invention

[0003] In view of this, the present invention provides an electric cylinder suitable for marine environment, so as to be widely used in linear motion structures that need to perform thrust in harsh environments.

[0004] The present invention provides the following technical solutions: an electric cylinder suitable for marine environment, comprising a housing assembly, a power transmission device and a precision conversion device, wherein the power transmission device is arranged on the housing assembly, and the power transmission device comprises: an internal spline sleeve connected to the housing assembly; a ball nut and a lead screw arranged in the internal spline sleeve; an output shaft, wherein the ball nut is fixedly connected to the output shaft and can push the output shaft to output displacement; and a motor fixed on the internal spline sleeve, wherein the motor is drive-connected to the lead screw through the precision conversion device.

[0005] Furthermore, a gear is provided on the output shaft of the motor, and the power transmission device includes: a second actuator, which is supported and installed on the housing assembly, and a plurality of planetary gear assemblies are installed on the second actuator; a first actuator, which is connected to the second actuator through steel ball supports, and a plurality of planetary gear assemblies are installed on the first actuator, and the first actuator is connected to the gears on the output shaft of the motor through steel ball supports; an inner ring gear, which is meshed with the planetary gear assemblies on the first actuator and the second actuator.

[0006] Furthermore, the power transmission device includes: a first gear connected to the second actuator; and a second gear meshed with the first gear and connected to the precision conversion device.

[0007] Furthermore, the precision conversion device includes: a first double gear meshing with the second gear, and the first double gear is connected to the lead screw.

[0008] Furthermore, the precision conversion device includes: a second duplex gear, one side of which is meshed with the first duplex gear; an anti-backlash gear assembly, which is meshed with the other side of the second duplex gear; and a rotary transformer, which is connected to the anti-backlash gear assembly and can generate an electrical signal of the rotation speed of the screw.

[0009] Furthermore, the housing assembly is provided with a groove, and the electric cylinder suitable for marine environment further comprises a driver assembly installed in the groove and electrically connected to the rotary transformer and the motor.

[0010] Furthermore, the housing assembly comprises a cylinder body and an end cover, and the end cover sealing cover is arranged on the cylinder body.

[0011] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above-mentioned technical solutions adopted by the present invention include at least the following: the present invention has self-locking, sealing reliability, repeated positioning accuracy and self-health management functions under marine water pressure environment, small size, light weight, high reliability, good maintainability, which can effectively improve the accessibility of operators, promote the transformation of the fully electrified system, and completely solve the problem of hydraulic cylinder hydraulic oil leakage and pollution of the marine environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a cross-sectional view of the electric cylinder of the present invention suitable for marine environment;

[0014] Figure 2 is a partial cross-sectional view of a housing assembly of the present invention;

[0015] Figure 3 is a cross-sectional view of the power transmission device of the present invention;

[0016] Figure 4 It is a schematic diagram of the installation position of the driver assembly of the present invention;

[0017] Figure 5 It is a partial cross-sectional view of the precision conversion device of the present invention.

[0018] Reference numerals in the figures:

[0019] 1. Shell assembly; 101. Cylinder body; 102. End cover; 103. First sealing ring; 104. Second sealing ring; 105. Spring energy storage sealing ring;

[0020] 2. Power transmission device; 201. First bearing; 202. First stop block; 203. Screw plug; 204. Ball nut; 205. Lead screw; 206. Internal spline sleeve; 207. Second stop block; 208. Cylindrical pin; 209. Copper bushing; 210. Output shaft; 211. Motor; 212. First screw; 213. Steel ball; 214. Planetary gear assembly; 215. Internal gear ring; 216. First actuator; 217. Second actuator; 218. Second screw; 219. Second bearing; 220. First gear; 221. First transmission key; 222. Second gear; 223. Third bearing;

[0021] 3. Driver assembly; 301. Gasket; 302. Driver plate; 303. Locking guide strip; 304. Wire assembly;

[0022] 4. Precision conversion device; 401. Second transmission key; 402. First duplex gear; 403. Stop washer; 404. Nut; 405. Second duplex gear; 406. Second bracket; 407. Bearing; 408. First anti-backlash gear; 409. Spring; 410. Spring retaining ring for shaft; 411. Second anti-backlash gear; 412. Bushing; 413. Rotary transformer; 414. Second screw; 415. Pressing plate; 416. First bracket; 417. Third screw. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] like Figures 1 to 5 As shown, the present invention provides an electric cylinder suitable for marine environment, comprising: a housing assembly 1, a power transmission device 2, a driver assembly 3, and a precision conversion device 4.

[0026] The housing assembly 1 includes a cylinder body 101 , an end cover 102 , a first sealing ring 103 , a second sealing ring 104 , and a spring energy storage sealing ring 105 .

[0027] The power transmission device 2 includes a first bearing 201, a first limit block 202, a screw plug 203, a ball nut 204, a lead screw 205, an internal spline sleeve 206, a second limit block 207, a cylindrical pin 208, a copper bushing 209, an output shaft 210, a motor 211, a first screw 212, a steel ball 213, a planetary gear assembly 214, an inner ring gear 215, a first guide 216, a second guide 217, a second screw 218, a second bearing 219, a first gear 220, a first transmission key 221, a second gear 222, and a third bearing 223. The torque is output from the motor 211, and the output shaft 210 outputs the displacement through the power transmission device.

[0028] The driver assembly 3 includes a pad strip 301, a driving plate 302, a locking guide strip 303 and a wire group 304. The driver assembly 3 can be directly installed in the groove of the housing assembly to achieve quick plugging and unplugging in a narrow space.

[0029] The precision conversion device 4 includes a second transmission key 401, a first double gear 402, a stop washer 403, a nut 404, a second double gear 405, a second bracket 406, a bearing 407, a first anti-backlash gear 408, a spring 409, a shaft spring retaining ring 410, a second anti-backlash gear 411, a bushing 412, a rotary transformer 413, a second screw 414, a pressing plate 415, a first bracket 416, and a third screw 417.

[0030] The static seal between the cylinder body 101 and the end cover 102 is achieved by the first sealing ring 103. In order to increase the path of fluid leakage and increase the flow resistance, the contact surface between the cylinder body and the end cover is designed to be a "J" shape; the dynamic seal at the output shaft 210 is achieved by the second sealing ring 104 and the spring energy storage sealing ring 105. The spring energy storage sealing ring 105 has self-storage and rebound capabilities, and is particularly suitable for use in water or water vapor with poor lubrication conditions. The dynamic and static seals of the electric cylinder both adopt a double redundancy design.

[0031] The ball nut 204 and the lead screw 205 form a ball screw pair, which is installed in the internal spline sleeve 206. The ball nut 204 is fixed to the output shaft 210 through the screw plug 203, and the ball nut 204 moves on the lead screw 205 to push the output shaft 210 to output displacement. In order to prevent the output shaft 210 from exceeding the maximum displacement of the working stroke, the first limit block 202 and the second limit block 207 are provided at both ends of the lead screw 205 to provide mechanical limit, and the first limit block 202 and the second limit block 207 are fixed to the lead screw 205 through a cylindrical pin 208. When the output shaft 210 moves, the first bearing 201 bears and transmits the force to the cylinder body 101, and the copper bushing 209 provides support when the output shaft 210 moves and forms a lubricating film when the output shaft 210 reciprocates to reduce friction.

[0032] The motor 211 is mounted on the inner spline sleeve 206 by the first screw 212, and the inner spline sleeve 206 is mounted on the middle partition of the cylinder body 101 by the second screw 218. The second actuator 217 is supported and mounted on the middle partition of the cylinder body 101 by the second bearing 219, and three planetary gear assemblies 214 are mounted on the second actuator 217, and are supported and connected to the first actuator 216 by the steel ball 213. The first actuator 216 is mounted on the three planetary gear assemblies 214, and are supported and connected to the gears on the output shaft of the motor 211 by the steel ball 213. The planetary gear assemblies 214 on the first actuator 216 and the second actuator 217 are meshed with the inner gear ring 215.

[0033] The first gear 220 is mounted on the second actuator 217 via a first transmission key 221 and meshes with the second gear 222 . The second gear 222 is supported on the middle partition of the cylinder body 101 via a third bearing 223 .

[0034] The second gear 222 meshes with the first duplex gear 402, and the first duplex gear 402 is fixedly connected to the lead screw 205 via the second transmission key 401. A stop washer 403 and a nut 404 are installed at the end of the lead screw 205 to prevent the first duplex gear 402 from falling out.

[0035] The first anti-backlash gear 408, the spring 409 and the second anti-backlash gear 411 form an anti-backlash gear assembly, a bushing 412 and a rotary transformer 413 are installed on the shaft of the second anti-backlash gear 411, three pressing plates 415 are evenly distributed around the rotary transformer 413 and fixed to the first bracket 416 by the second screw 414. The second double gear 405 is meshed with the first double gear 402 and the anti-backlash gear assembly at the same time, and the rotation speed of the lead screw 205 is transmitted to the rotary transformer 413, and the rotary transformer 413 converts the rotation speed into an accurate electrical signal.

[0036] The drive board 302 integrates the functions of stroke, forward rotation, reverse rotation, self-locking, current, voltage, lower limit, upper limit, temperature, and humidity monitoring. In order to improve the repeatability positioning accuracy requirements of the electric cylinder, the drive board 302 is designed with a soft start and soft stop circuit for the motor 211. The motor 211 and the rotary transformer 413 are connected through a wire group 304, which can effectively eliminate the influence of inertial slip on the accuracy. Due to limited installation space, it can only be laid out and installed in a space of 14 cm long, 9 cm wide and 1 cm high. For easy maintenance, locking guide strips 303 are installed on both sides of the drive board 302. It is only necessary to tighten or loosen the screws on the locking guide strips 303 during installation and removal.

[0037] The beneficial effects of the present invention are as follows: an electric cylinder suitable for deep sea is provided, which is designed with an electric motor, a power transmission device, a driver assembly, and a precision conversion device. It has self-locking, sealing reliability, repeated positioning accuracy and self-health management functions under marine water pressure environment. It is small in size, light in weight, highly reliable, and easy to maintain. It can effectively improve the accessibility of operators, promote the transformation of the fully electrified system, and completely solve the problem of hydraulic cylinder hydraulic oil leakage and pollution of the marine environment.

[0038] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention, should still fall within the scope of this patent. In addition, the technical features of the present invention can be freely combined with each other, with each other, and with each other.

Claims

1. An electric cylinder suitable for marine environment, characterized in that: The invention comprises a housing component (1), a power transmission device (2) and a precision conversion device (4), wherein the power transmission device (2) is arranged on the housing component (1), and the power transmission device (2) comprises: An internal spline sleeve (206) connected to the housing assembly (1); A ball nut (204) and a lead screw (205) are arranged in an internal spline sleeve (206); The output shaft (210) and the ball nut (204) are fixedly connected to the output shaft (210) and are capable of pushing the output shaft (210) to output displacement; The motor (211) is fixed on the internal spline sleeve (206), and the motor (211) is drivingly connected to the lead screw (205) through the precision conversion device (4).

2. The electric cylinder suitable for marine environment according to claim 1, characterized in that: The output shaft of the motor (211) is provided with a gear, and the power transmission device (2) comprises: A second actuator (217) is supported and mounted on the housing assembly (1), and a plurality of planetary gear assemblies (214) are mounted on the second actuator (217); A first actuator (216) is supported and connected to a second actuator (217) through a steel ball (213); a plurality of planetary gear assemblies (214) are mounted on the first actuator (216); and the first actuator (216) is supported and connected to a gear on an output shaft of the motor (211) through the steel ball (213); The inner gear ring (215) is meshed with the planetary gear assemblies (214) on the first actuator (216) and the second actuator (217).

3. The electric cylinder suitable for marine environment according to claim 2, characterized in that: The power transmission device (2) comprises: A first gear (220), the first gear (220) is connected to the second actuator (217); The second gear (222) is meshed with the first gear (220) and connected to the precision conversion device (4).

4. The electric cylinder suitable for marine environment according to claim 3, characterized in that: The precision conversion device (4) comprises: The first double gear (402) is meshed with the second gear (222), and the first double gear (402) is connected to the lead screw (205).

5. The electric cylinder suitable for marine environment according to claim 4, characterized in that: The precision conversion device (4) comprises: A second duplex gear (405), one side of which is meshed with the first duplex gear (402); an anti-backlash gear assembly meshing with the other side of the second duplex gear (405); A rotary transformer (413) is connected to the anti-backlash gear assembly and is capable of generating an electrical signal of the rotation speed of the lead screw (205).

6. The electric cylinder suitable for marine environment according to claim 5, characterized in that: The housing component (1) is provided with a groove, and the electric cylinder suitable for marine environment further comprises a driver component (3) which is installed in the groove and is electrically connected to the rotary transformer (413) and the motor (211).

7. The electric cylinder suitable for marine environment according to any one of claims 1 to 6, characterized in that: The housing assembly (1) comprises a cylinder body (101) and an end cover (102), wherein the end cover (102) is sealed and arranged on the cylinder body (101).

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