An electric cylinder for underwater applications

Abstract

The application discloses an underwater electric cylinder, which comprises a shell, an outer pipe, a driving motor, a ball screw, a power pipe, a power pipe guiding device, a front end cover and a joint.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric cylinders, and more particularly, to an electric cylinder for underwater application. BACKGROUND

[0002] An electric cylinder is a product that converts the rotary motion of a motor into linear motion. At present, linear motion products for underwater environments are mostly hydraulic products. However, due to the complexity of the marine environment and the strong corrosiveness of seawater, hydraulic cylinders are prone to damage. In addition, the precision of hydraulic control is difficult to meet the increasingly high positioning accuracy requirements. SUMMARY

[0003] The purpose of the present application is to design and develop an electric cylinder for underwater application. The sealing property of the electric cylinder is improved through a fully sealed structure, realizing the underwater application of the electric cylinder. Meanwhile, the stability of the power pipe is realized through the combination of the power pipe and the power pipe guiding device.

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

[0005] An electric cylinder for underwater application comprises:

[0006] a housing; and

[0007] an outer pipe, one end of which is connected to the housing;

[0008] a driving motor, which is arranged in the housing;

[0009] a ball screw, which is arranged in the outer pipe, and a screw rod of the ball screw is connected to an output end of the driving motor;

[0010] a power pipe, one end of which is connected to a nut of the ball screw, and the other end of which extends to the outside of the outer pipe;

[0011] a power pipe guiding device, which is sleeved on the outside of the power pipe, and one end of the power pipe guiding device is connected to the other end of the outer pipe;

[0012] a front end cover, which is sleeved on the outside of the power pipe, and the front end cover is connected to the other end of the power pipe guiding device;

[0013] a joint, one end of which is connected to the other end of the power pipe, and the other end of which is connected to an external load;

[0014] Among them, the housing, the outer pipe, the power pipe guiding device, the front end cover, the joint and the power pipe are all sealed structures.

[0015] Preferably, the housing comprises:

[0016] a motor shield; and

[0017] a motor shield rear cover arranged at one end of the motor shield;

[0018] a bearing seat arranged at the other end of the motor shield, and a first accommodating cavity and a second accommodating cavity arranged in the bearing seat in communication;

[0019] wherein the diameter of the first accommodating cavity is smaller than the diameter of the second accommodating cavity, the driving motor is fixed in the motor shield, and one end of the outer pipe is connected with the bearing seat.

[0020] Preferably, it further comprises:

[0021] a fixed collar arranged between one end of the screw rod of the ball screw and the output shaft of the driving motor.

[0022] Preferably, it further comprises:

[0023] two bearings arranged in the first accommodating cavity;

[0024] a bearing gland coaxial with the two bearings arranged in the second accommodating cavity, for pressing the outer rings of the two bearings;

[0025] a bearing nut coaxial with the bearing gland arranged at one side of the inside of the bearing gland, for pressing the inner rings of the two bearings;

[0026] a rotary oil seal coaxial with the bearing nut arranged at the other side of the inside of the bearing gland;

[0027] wherein one end of the screw rod of the ball screw passes through the two bearings, the bearing nut is fixed on the screw rod of the ball screw, and the rotary oil seal is sleeved on the screw rod of the ball screw.

[0028] Preferably, the power pipe guiding device comprises:

[0029] a power pipe guiding sleeve sleeved on the outside of the power pipe;

[0030] a power pipe guiding sleeve mounting seat arranged on the outside of the power pipe guiding sleeve, and the power pipe guiding sleeve mounting seat is connected with the outer pipe and the front end cover.

[0031] Preferably, it further comprises:

[0032] a first piston sealing ring arranged in the inside of the front end cover, and the first piston sealing ring is interference connected with the power pipe;

[0033] a second piston sealing ring arranged at the end of the front end cover, and the second piston sealing ring is interference connected with the power pipe.

[0034] Preferably, further comprising:

[0035] A magnetic ring is sleeved outside the power pipe.

[0036] Preferably, further comprising:

[0037] An aviation plug is fixed outside the motor shield rear cover;

[0038] A cable sheath plug is connected with the aviation plug.

[0039] The beneficial effects of the present application are:

[0040] The underwater application electric cylinder designed and developed by the present application is provided with full sealing between the shell, the outer pipe, the power pipe guide device, the front end cover, the joint and the power pipe, so as to prevent seawater from entering the inside of the electric cylinder and affecting the normal operation of the electric cylinder, improve the sealing property of the electric cylinder, realize the underwater application of the electric cylinder, and have excellent seawater corrosion resistance. Meanwhile, the combination of the power pipe and the power pipe guide device realizes the stability of the power pipe and guarantees the axial movement of the power pipe. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 The figure is a structural schematic view of the underwater application electric cylinder.

[0042] Figure 2 The figure is a sectional structure schematic view of the underwater application electric cylinder.

[0043] Figure 3 The figure is an assembly sectional structure schematic view of the driving motor.

[0044] Figure 4 The figure is a sectional structure schematic view of the bearing seat.

[0045] Figure 5 The figure is an assembly sectional structure schematic view of the bearing seat.

[0046] Figure 6 The figure is an assembly sectional structure schematic view of the power pipe guide device. DETAILED DESCRIPTION

[0047] The present application will be further described in detail below, so that those skilled in the art can implement the present application according to the description.

[0048] As shown in Figure 1 , Figure 2 The present application provides an underwater application electric cylinder, which comprises:

[0049] Motor housing 101, bearing seat 102, motor housing back cover 103, stud 104, spring washer 105, nut 106, drive motor 107, fixed collar 108, cable gland 111, aviation plug 112, first screw 113, outer tube 120, power tube 130, front end cover 140, power tube guide sleeve mounting seat 151, power tube guide sleeve 152, first threaded joint 160, first O-ring 171, second O-ring 172, third O-ring 173, fourth O-ring 174, fifth O-ring 175, sixth O-ring 176, seventh O-ring 177, first piston seal ring 178, second piston seal ring 179, screw rod of ball screw 181, lifting nut 182, fourth screw 183, magnetic ring 184, two bearings 191, bearing gland 192, third screw 193, bearing nut 194 and rotary oil seal 195.

[0050] Motor housing 101 is a cylindrical structure with both ends open, motor housing back cover 103 and bearing seat 102 are arranged at both ends of motor housing 101 respectively, bearing seat 102, motor housing 101 and motor housing back cover 103 are connected and fixed together through stud 104, spring washer 105 and nut 106, and the motor housing 101 is sealed, as shown in Figure 3 Drive motor 107 is fixedly installed on bearing seat 102 through stud 104 and placed in motor housing 101, and the purpose is to cover drive motor 107 through the arrangement of motor housing 101, so as to prevent water from entering drive motor 107.

[0051] Third O-ring 173 is installed at the clamping part between bearing seat 102 and motor housing 101, and second O-ring 172 is installed at the clamping part between motor housing back cover 103 and motor housing 101, which is used for sealing the gap in motor housing 101.

[0052] Aviation plug 112 is fixed on motor housing back cover 103 through first screw 113, first O-ring 171 is installed on motor housing back cover 103, which is used for sealing the gap formed between aviation plug 112 and motor housing back cover 103, and cable gland 111 is inserted into aviation plug 112.

[0053] As shown in Figure 4 , Figure 5As shown, the bearing seat 102 is provided with a first accommodating cavity 201 and a second accommodating cavity 202 in communication, the diameter of the first accommodating cavity 201 is smaller than that of the second accommodating cavity 202, the first accommodating cavity 201 is provided with an inwardly extending flange relative to the other side connected with the second accommodating cavity 202, two bearings 191 are installed back-to-back in the first accommodating cavity 201, and one side of the two bearings 191 is axially fixed through the flange, the bearing gland 192 is concentrically installed with the bearing 191 in the second accommodating cavity 202, the bearing gland 192 is installed on the bearing seat 102 with the third screw 193, for pressing the other side outer ring of the two bearings 191, the bearing nut 194 is coaxially arranged with the two bearings 191 on the inner side of the bearing gland 192, for pressing the inner ring of the two bearings 191.

[0054] The outer tube 120 is a hollow cylindrical structure, the right end of the outer tube 120 is concentrically connected with the bearing seat 102 through threads, the fourth O-ring 174 is used to seal the gap between the outer tube 120 and the bearing seat 102, the left end of the outer tube 120 is fixedly installed with the right end of the power tube guide sleeve mounting seat 151 through threads, and the fifth O-ring 175 is used to seal the gap between the outer tube 120 and the power tube guide sleeve mounting seat 151.

[0055] The screw rod 181 of the ball screw is coaxially arranged in the outer tube 120, and the right end of the screw rod 181 of the ball screw is concentrically installed at the two back-to-back installed bearings 191, which are rotatably supported in the bearing seat 102 through the bearings 191, the bearing nut 194 is fixed on the screw rod 181 of the ball screw through threads and rotates concentrically with the screw rod 181 of the ball screw, the rotary oil seal 195 is coaxially arranged with the bearing nut 194 on the other side of the inner side of the bearing gland 192, and the rotary oil seal 195 is sleeved on the screw rod 181 of the ball screw, the right end of the screw rod 181 of the ball screw passes through the rotary oil seal 195, is concentrically installed with the motor shaft of the driving motor 107, and is fixed with the fixed collar 108, the rotary oil seal 195 can prevent external dust from entering the internal part of the electric cylinder, and prevent the loss of oil in the internal part of the electric cylinder.

[0056] The lifting nut 182 is located in the outer tube 120 and is matched and installed on the screw rod 181 of the ball screw, the power tube 130 is a hollow structure and is coaxially sleeved on the left end of the screw rod 181 of the ball screw, one end (right end) of the power tube 130 is fixedly connected with the lifting nut 182 through the fourth screw 183, the other end (left end) extends to the outside of the outer tube 120 to the left, the external thread joint 160 is concentrically installed with the power tube 130 (left end) through threads, and the seventh O-ring is used to seal the gap between the power tube 130 and the external thread joint 160.

[0057] As Figure 6As shown, the power tube guide device is sleeved outside the power tube 130, and the power tube guide device comprises a power tube guide sleeve 152 and a power tube guide sleeve mounting seat 151, wherein the left end of the power tube guide sleeve mounting seat 151 is connected with the front end cover 140 in a threaded concentric manner, and a sixth O-shaped ring 176 is used to seal the gap between the left end of the power tube guide sleeve mounting seat 151 and the front end cover 140; the power tube guide sleeve 152 is concentrically mounted outside the power tube 130, and the power tube guide sleeve 152 is arranged inside the guide sleeve mounting seat 151, so as to enable the power tube 130 to normally expand and contract.

[0058] The front end cover 140 is provided with a first piston sealing ring 178 and a second piston sealing ring 179, the first piston sealing ring 178 is arranged inside the front end cover 140 and is connected with the power tube 130 in an interference fit, and the second piston sealing ring 179 is arranged at the end of the front end cover 140 and is connected with the power tube 130 in an interference fit; the first piston sealing ring 178 and the second piston sealing ring 179 are used to seal the gap formed between the front end cover 140 and the power tube 130, so as to prevent external dust and other impurities from entering the inside of the electric cylinder and improve the protection level of the electric cylinder.

[0059] The left end of the power tube 130 is also connected with an external threaded joint 160, which is used to be connected with an external load of the electric cylinder, the external threaded joint 160 is located outside the outer tube 120 and is connected with the power tube 130 in a threaded manner.

[0060] In the embodiment, a magnetic ring 184 is sleeved outside the power tube 130, which can trigger a magnetic induction switch outside the electric cylinder.

[0061] In the embodiment, thread sealant is coated between the stud 104, the spring washer 105 and the nut 106, so as to ensure sealing and prevent external water from entering the inside of the electric cylinder through the holes on the motor cover back cover 103.

[0062] All exposed components in the application are made of 022Cr25Ni6Mo2N duplex stainless steel.

[0063] The electric cylinder for underwater application designed and developed in the application is provided with full sealing between the shell, the outer tube, the power tube guide device, the front end cover, the joint and the power tube, so as to improve the sealing performance of the electric cylinder, realize underwater application of the electric cylinder, and have excellent seawater corrosion resistance, and meanwhile, the combination of the power tube and the power tube guide device realizes stability of the power tube and guarantees axial movement of the power tube.

[0064] While embodiments of the application have been disclosed in connection with the above specification, it will be apparent to those skilled in the art that numerous modifications can be made thereto without departing from the overall concept of the application. Accordingly, it is intended that all such modifications be included within the scope of the claims and their equivalents.

Claims

1. An electrically powered cylinder for underwater applications, characterized in that, The utility model relates to a kind of telescopic drive mechanism, including: Shell; And Outer tube, one end is connected with the shell; Driving motor, it is arranged in the shell; Ball screw, it is arranged in the outer tube, and the screw rod one end of the ball screw is connected with the output end of the driving motor; Power tube, one end is connected with the nut of the ball screw, and the other end extends to the outside of the outer tube; Power tube guide device, it is sleeved in the outside of the power tube, and one end of the power tube guide device is connected with the other end of the outer tube; Front end cover, it is sleeved in the outside of the power tube, and the front end cover is connected with the other end of the power tube guide device; Joint, one end is connected with the other end of the power tube, and the other end is connected with external load; The shell includes: Motor shield;And Motor shield back cover, it is arranged in one end of the motor shield; Bearing seat, it is arranged in the other end of the motor shield, and first accommodating cavity and second accommodating cavity that are connected are arranged in the inside of the bearing seat; Two bearings, it is arranged in the first accommodating cavity; Bearing gland, it is coaxial with the two bearings and arranged in the second accommodating cavity, for pressing the outer ring of the two bearings; Bearing nut, it is coaxial with the bearing gland and arranged in the inside one side of the bearing gland, for pressing the inner ring of the two bearings; Rotary oil seal, it is coaxial with the bearing nut and arranged in the inside other side of the bearing gland; Wherein, the shell, outer tube, power tube guide device, front end cover, joint and power tube are all sealed structure between, the diameter of the first accommodating cavity is less than the diameter of second accommodating cavity, the driving motor is fixed in the motor shield, one end of the outer tube is connected with the bearing seat, the screw rod one end of the ball screw passes through the two bearings, the bearing nut is fixed on the screw rod of the ball screw, the rotary oil seal is sleeved on the screw rod of the ball screw.

2. The electrically powered cylinder for underwater applications of claim 1, wherein, Also include: Fixed collar, it is arranged between the screw rod one end of the ball screw and the output shaft of the driving motor.

3. The electrically powered cylinder for underwater applications of claim 2, wherein, The power tube guide device includes: Power tube guide sleeve, it is sleeved in the outside of the power tube; Power tube guide sleeve mounting seat, it is arranged in the outside of the power tube guide sleeve, and the power tube guide sleeve mounting seat is connected with the outer tube and front end cover.

4. The electrically powered cylinder for underwater applications of claim 3, wherein, Also include: First piston sealing ring, it is arranged in the inside of the front end cover, and the first piston sealing ring is connected with the power tube interference; Second piston sealing ring, it is arranged in the end of the front end cover, and the second piston sealing ring is connected with the power tube interference.

5. The electrically powered cylinder for underwater applications of claim 4, wherein, Also include: Magnetic ring, it is sleeved in the outside of the power tube.

6. The electrically powered cylinder for underwater applications of claim 5, wherein, Also include: Aviation plug, it is fixed in the outside of the motor shield back cover; Cable sheath plug, it is connected with the aviation plug.

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