Waterproof electric push rod

Abstract

The utility model discloses a waterproof electric push rod which comprises a gear box, a motor, a transmission mechanism, an outer pipe, a lead screw, an inner pipe and a transmission nut, the motor and the transmission mechanism are respectively installed in the gear box, the inner pipe is arranged in the outer pipe, the lead screw is arranged in the inner pipe, the motor is in transmission connection with the lead screw through the transmission mechanism, and the lead screw is in threaded connection with the transmission nut. The outer side of the transmission nut is fixedly connected with the inner pipe, the gearbox comprises a bottom cover and a top cover, the bottom cover and the top cover are matched with each other, an installation cavity used for installing a motor and a transmission mechanism is formed between the bottom cover and the top cover, a first groove distributed longitudinally is formed in the bottom cover, a second groove distributed longitudinally is formed in the top cover, and the first groove and the second groove are matched with each other. The first groove and the second groove are matched to form a limiting groove, and the first sealing ring is embedded in the limiting groove and arranged on the outer pipe in a sleeving mode. The waterproof electric push rod has the advantages that the overall waterproof performance of the electric push rod is enhanced on the premise of not influencing the original mechanical performance, so that the electric push rod can reliably operate in a harsh environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of electric push rod, in particular to a kind of waterproof electric push rod. BACKGROUND

[0002] As an important part of automation control, electric push rod plays an indispensable role in many industrial applications. However, in some special use environments, such as outdoor facilities, medical equipment, ship equipment and other occasions susceptible to moisture, the waterproof performance of electric push rod becomes a crucial design consideration. Traditional electric push rod has many deficiencies in waterproof design, which not only limits its application range, but also affects the overall reliability of the product.

[0003] Most of the electric push rods on the market currently perform well in mechanical performance, but when moisture enters, the internal electronic components are easily damaged. Especially for those applications that need to be in high humidity or directly exposed to rain, the waterproof ability of electric push rod directly affects the safety and service life of the system. Existing waterproof measures, such as simple rubber sealing ring or waterproof coating, may fail due to aging or wear during long-term use, and cannot provide continuous and effective protection.

[0004] In addition, in the daily maintenance of electric push rod, the process of disassembly and reassembly may also damage the original waterproof structure, resulting in a decrease in waterproof performance. Therefore, it is particularly important to develop an electric push rod that can work stably in various humid environments for a long time. SUMMARY

[0005] The utility model aims to provide a kind of waterproof electric push rod, under the premise of not affecting original mechanical performance, enhance the overall waterproof performance of electric push rod, so that it can reliably operate in more severe environments.

[0006] To achieve the above object, the utility model provides the following technical scheme: a waterproof electric push rod, including gear box, motor, transmission mechanism, outer tube, screw rod, inner tube and transmission nut, the motor and transmission mechanism are installed in gear box respectively, the inner tube is located in the outer tube, the screw rod is located in the inner tube, the motor is connected with the screw rod transmission through transmission mechanism, the screw rod is connected with the transmission nut, the outside of transmission nut is fixedly connected with the inner tube, still include first sealing washer, the gear box includes bottom cover and top cover, the bottom cover and the top cover cooperate with each other, and the installation cavity for installing the motor and the transmission mechanism is formed between the two, a longitudinal distribution's first recess is arranged on the bottom cover, a longitudinal distribution's second recess is arranged on the top cover, the first recess and the second recess cooperate and form the limiting groove, the first sealing washer is embedded in the limiting groove, and is sleeved on the outer tube, the upper surface of bottom cover is concave downward and forms first U type groove, the lower surface of top cover is concave upward and forms second U type groove, the first U type groove and the second U type groove cooperate and form the sealing area for waterproof adhesive injection.

[0007] Preferably, it further comprises a cover and a second sealing ring, the cover is fixed on one end of the outer tube, and a through hole is formed on the cover for the inner tube to pass through, and an installation groove is formed on the inner wall of the through hole, and the second sealing ring is embedded in the installation groove and tightly contacts with the outer wall of the inner tube.

[0008] Preferably, a flange is further arranged on the cover and extends into the outer tube, and an annular clamping groove is formed between the flange and the inner wall of the cover, so that the outer tube can be clamped into the annular clamping groove, and waterproof adhesive is filled in the annular clamping groove.

[0009] Preferably, mounting plates are fixed on both sides of the bottom cover or the top cover, and mounting holes are formed on the mounting plates.

[0010] Preferably, the waterproof electric push rod further comprises a stroke limiting assembly, the stroke limiting assembly comprises an FPC circuit board, a metal contact piece and limiting points, the FPC circuit board is attached to the inner wall of the outer tube, the metal contact piece is fixed on the transmission nut, and the limiting points are arranged at both ends of the FPC circuit board; under the driving of the motor, the screw rod rotates and drives the inner tube to make linear reciprocating motion through the transmission nut, when the transmission nut moves to the extreme position, the metal contact piece touches the corresponding limiting point, so that the circuit is interrupted, thereby limiting the stroke of the inner tube.

[0011] Preferably, the metal contact piece is riveted on the outer side wall of the transmission nut.

[0012] Preferably, the transmission mechanism comprises a gear frame, a first gear, a second gear, a third gear and a fourth gear, the first gear, the second gear, the third gear and the fourth gear are rotatably installed on the gear frame respectively, the first gear is connected with the motor output shaft, the second gear is meshed with the first gear, the third gear is meshed with the second gear, the fourth gear is meshed with the third gear, the center of the fourth gear is connected with a flat transmission shaft, one end of the flat transmission shaft extends to the outside of the gear frame and is fixed with the lead screw to realize that the motor drives the lead screw to rotate through four-stage gear deceleration.

[0013] Compared with the prior art, the utility model has the advantages that the recess structure on the bottom cover and the top cover and the U-shaped groove are utilized, multiple functional components are formed, and the waterproof performance and structural stability of the electric push rod are effectively improved.

[0014] Specifically, the first recess and the second recess distributed longitudinally and arranged on the bottom cover and the top cover respectively form a limiting groove in cooperation, and the limiting groove is used for embedding the first sealing ring, the position of the first sealing ring can be effectively fixed, displacement of the sealing ring due to vibration or other factors in the use process is avoided, and the sealing effect is ensured.

[0015] The first U-shaped groove recessed downward and the second U-shaped groove recessed upward arranged on the bottom cover and the top cover respectively form a sealing area for injecting waterproof glue, the waterproof glue can be effectively fixed at the connecting position of the bottom cover and the top cover, a sealing barrier is formed, external water vapor is prevented from penetrating into the electric push rod, and the waterproof performance is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0017] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0018] Figure 2 It is a sectional view of the utility model;

[0019] Figure 3 It is a three-dimensional structure schematic view of the internal structure of the gear box in the utility model;

[0020] Figure 4 It is a three-dimensional structure schematic view of the bottom cover in the utility model;

[0021] Figure 5 It is the three-dimensional structure schematic view of the top cover in the utility model;

[0022] Figure 6 It is the three-dimensional structure schematic view of the gear box in the utility model;

[0023] Figure 7 It is the three-dimensional structure schematic view of the sealing cover in the utility model;

[0024] Figure 8 It is the three-dimensional structure schematic view of the transmission mechanism in the utility model;

[0025] Figure 9 It is the three-dimensional structure schematic view of the FPC circuit board in the utility model;

[0026] In the figure, 1, gear box;2, motor;3, transmission mechanism;4, outer tube;5, screw;6, inner tube;7, transmission nut;8, first sealing ring;9, bottom cover;10, top cover;11, first recess;12, second recess;13, limit groove;14, first U-shaped groove;15, second U-shaped groove;16, sealing cover;17, second sealing ring;18, flange;19, annular clamping groove;20, mounting plate;21, mounting hole;22, stroke limit assembly;23, self-tapping screw;24, FPC circuit board;25, metal contact piece;26, limit point;27, gear carrier;28, first gear;29, second gear;30, third gear;31, fourth gear;32, flat transmission shaft. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0028] Embodiment one: as shown, a waterproof electric push rod, including gear box 1, motor 2, transmission mechanism 3, outer tube 4, screw rod 5, inner tube 6 and transmission nut 7, motor 2 and transmission mechanism 3 are installed in gear box 1 respectively, inner tube 6 is arranged in outer tube 4, screw rod 5 is arranged in inner tube 6, motor 2 is connected with screw rod 5 through transmission mechanism 3, screw rod 5 is connected with transmission nut 7, the outside of transmission nut 7 is fixedly connected with inner tube 6, further including first sealing ring 8, gear box 1 includes bottom cover 9 and top cover 10, bottom cover 9 and top cover 10 cooperate with each other, and the installation cavity for installing motor 2 and transmission mechanism 3 is formed between the two, a first groove 11 is arranged on the bottom cover 9, a second groove 12 is arranged on the top cover 10, the first groove 11 and the second groove 12 cooperate to form a limiting groove 13, the first sealing ring 8 is embedded in the limiting groove 13 and is sleeved on the outer tube 4, the upper surface of the bottom cover 9 is concave downward to form a first U-shaped groove 14, the lower surface of the top cover 10 is concave upward to form a second U-shaped groove 15, the first U-shaped groove 14 and the second U-shaped groove 15 cooperate to form a sealing area for injecting waterproof glue.

[0029] The waterproof electric push rod effectively isolates external moisture and pollutants through multiple sealing measures, ensures the long-term reliable operation of the internal core components, and the whole device is composed of gear box 1, motor 2, transmission mechanism 3, outer tube 4, screw rod 5, inner tube 6 and transmission nut 7, wherein the motor 2 and the transmission mechanism 3 are installed in the gear box 1, the inner tube 6 is arranged in the outer tube 4, and the screw rod 5 is arranged in the inner tube 6. The motor 2 is connected with the screw rod 5 through the transmission mechanism 3, the screw rod 5 is connected with the transmission nut 7, and the outside of the transmission nut 7 is fixedly connected with the inner tube 6.

[0030] The key of the design lies in the sealing structure of the gear box 1, the gear box 1 includes bottom cover 9 and top cover 10, the two are locked with each other through self-tapping screw 23, and a sealed installation cavity for installing motor 2 and transmission mechanism 3 is formed, the first groove 11 is arranged on the bottom cover 9, the second groove 12 is arranged on the top cover 10, the two grooves cooperate to form a limiting groove 13, the first sealing ring 8 is embedded in the limiting groove 13 and is sleeved on the outer tube 4, which plays a double sealing role on the outer tube 4. At the same time, the upper surface of the bottom cover 9 is concave downward to form a first U-shaped groove 14, the lower surface of the top cover 10 is concave upward to form a second U-shaped groove 15, the two U-shaped grooves cooperate to form a sealing area for injecting waterproof glue, so as to form reliable sealing at the interface of the motor 2, the transmission mechanism 3 and the outer tube 4.

[0031] When working, the motor 2 drives the screw rod 5 to rotate through the transmission mechanism 3, the screw rod 5 drives the transmission nut 7 connected with it to move linearly, since the transmission nut 7 is fixed with the inner tube 6, therefore the inner tube 6 also moves linearly, the power is output through the outer tube 4 with good sealing, realizing the telescopic function of the push rod.

[0032] Example 2: As shown in the figure, unlike Example 1, it also includes a cap 16 and a second sealing ring 17. The cap 16 is fixed to one end of the outer tube 4, and a through hole is opened on the cap 16 for the inner tube 6 to pass through. The inner wall of the through hole is also provided with an installation groove. The second sealing ring 17 is embedded in the installation groove and is in close contact with the outer wall of the inner tube 6.

[0033] In the above structure, the cap 16 seals the entire outer tube 4, preventing direct exposure and thus enhancing the sealing performance. The mounting groove on the inner wall of the through hole and the embedded second sealing ring 17 provide a double seal for the inner tube 6. The through hole of the inner tube 6 is the most prone to leakage, but the second sealing ring 17 effectively avoids this problem. The second sealing ring 17 is in close contact with the outer wall of the inner tube 6, maintaining a good seal even during the long-stroke reciprocating motion of the inner tube 6, preventing liquid leakage along the gaps. Thus, this structure, together with the sealing structure on the bottom cover 9 and the top cover 10, forms a multi-layered effect, comprehensively sealing the internal and external gaps of the entire push rod device, greatly improving its water resistance, dustproof and other protective performance, and ensuring the long-term reliable operation of the core components in harsh environments such as humidity and dust.

[0034] In this embodiment, the cap 16 is also provided with a flange 18 that extends into the outer tube 4. An annular groove 19 is formed between the flange 18 and the inner wall of the cap 16, so that the outer tube 4 can be inserted into it. The annular groove 19 is filled with waterproof adhesive.

[0035] In the above structure, the annular groove 19 formed by the flange 18 and the inner wall provides a precise insertion position for the outer tube 4, so that the outer tube 4 and the cap 16 can be precisely connected and maintain their relative positions without shifting. The waterproof adhesive filled in the annular groove 19 fills the gap between the outer tube 4 and the cap 16, forming a completely seamless sealing ring, which can effectively prevent liquid and moisture from seeping in along the gap. In addition, the waterproof adhesive has a certain degree of elasticity, so it can maintain a good sealing state even when the outer tube 4 is slightly displaced.

[0036] In this embodiment, mounting plates 20 are fixed on both sides of the bottom cover 9 or the top cover 10, and mounting holes 21 are provided on the mounting plates 20.

[0037] In the above structure, the mounting plate 20 serves as a connector, allowing it to be connected to other structural components, such as being fixed to a machine tool or installed on other equipment. This effectively improves the installation flexibility and fixation of the electric linear actuator, enhances the stability of its overall structure, and provides greater convenience for a wider range of application scenarios.

[0038] The mounting hole 21 on the mounting plate 20 facilitates the use of bolts, screws or other fixing methods to firmly fix the electric push rod at the target position. This design not only facilitates installation and operation, but also effectively prevents the electric push rod from loosening or falling off during operation, thereby improving the safety of the device.

[0039] In this embodiment, the waterproof electric push rod further comprises a stroke limiting assembly 22. The stroke limiting assembly 22 comprises an FPC circuit board 24, a metal contact piece 25 and limiting points 26. The FPC circuit board 24 is attached to the inner wall of the outer tube 4, the metal contact piece 25 is fixed to the transmission nut 7, and the limiting points 26 are arranged at both ends of the FPC circuit board 24. Under the drive of the motor 2, the screw rod 5 rotates and drives the inner tube 6 to move linearly. When the transmission nut 7 moves to the extreme position at both ends, the metal contact piece 25 touches the corresponding limiting point 26, which interrupts the circuit, thereby limiting the stroke of the inner tube 6.

[0040] The working principle of the structure is as follows: under the drive of the motor 2, the screw rod 5 rotates to drive the transmission nut 7 connected thereto to move linearly. Since the outer side of the transmission nut 7 is fixedly connected with the inner tube 6, the inner tube 6 also moves linearly. When the inner tube 6 moves to the extreme position at both ends, the movable metal contact piece 25 touches the limiting points 26 at both ends of the FPC circuit board 24, which interrupts the circuit, thereby cutting off the power supply of the motor 2 and achieving limiting protection of the stroke of the inner tube 6.

[0041] This limiting mechanism design has many advantages. First, the movement of the inner tube 6 is controlled by interrupting the circuit, which is fast and can avoid damage caused by the inner tube 6 hitting the end. Second, the limiting points 26 are arranged at both ends of the circuit board, which can accurately control the end of the stroke and adjust the stroke. Third, the entire mechanism is small in size and is installed inside the outer tube 4, which avoids affecting the appearance. The contact between the metal contact piece 25 and the limiting point 26 is simple and reliable, and has strong anti-interference ability.

[0042] When it is necessary to restart the electric push rod and perform reverse movement, first, confirm that the motor is completely stopped and wait for a predetermined delay time (for example, several milliseconds to tens of milliseconds) to ensure that the motor is completely stopped. After that, the electric push rod changes the current direction of the motor through the H-bridge drive circuit to reverse the motor, thereby driving the inner tube 6 to move in the opposite direction. In the entire process, once the inner tube 6 approaches the extreme position at the other end, the above process is repeated to ensure that the electric push rod can operate safely and reliably in any case.

[0043] In this embodiment, the metal contact piece 25 is riveted to the outer side wall of the transmission nut 7.

[0044] In the structure, the metal contact piece 25 is fixed on the outer side wall of the transmission nut 7 in the form of riveting, effectively reducing the friction and wear between the contact piece and the inner tube 6, simplifying the installation steps, and improving the accuracy and reliability of the limiting function.

[0045] In the embodiment, the transmission mechanism 3 comprises a gear frame 27, a first gear 28, a second gear 29, a third gear 30 and a fourth gear 31, the first gear 28, the second gear 29, the third gear 30 and the fourth gear 31 are rotatably installed on the gear frame 27 respectively, the first gear 28 is connected with the output shaft of the motor 2, the second gear 29 is in meshing connection with the first gear 28, the third gear 30 is in meshing connection with the second gear 29, the fourth gear 31 is in meshing connection with the third gear 30, the center of the fourth gear 31 is connected with a flat transmission shaft 32, one end of the flat transmission shaft 32 extends to the outside of the gear frame 27 and is fixed with the lead screw 5, so as to realize the rotation of the lead screw 5 driven by the motor 2 through four-stage gear reduction.

[0046] The transmission mechanism 3 is designed with four-stage gear reduction, realizing the conversion from high-speed rotation of the motor 2 to low-speed rotation of the lead screw 5, and transmitting power to the lead screw 5 through the flat transmission shaft 32, the flat transmission shaft 32 is matched with the flat hole on the lead screw 5, thereby ensuring the thrust, efficiency and stability of the electric push rod, the motor 2 drives the first gear 28 through the output shaft, the first gear 28 drives the second gear 29, and so on, finally the power is transmitted to the lead screw 5 through the flat transmission shaft 32 connected with the center of the fourth gear 31, the four-stage gear reduction design effectively reduces the rotation speed of the motor 2, amplifies the thrust, and makes it more suitable for the working requirements of the push rod, the flat transmission shaft 32 can effectively transmit power to the lead screw 5, while ensuring the stability of the transmission process and preventing the transmission shaft from deviating due to vibration, in addition, the design of the flat transmission shaft 32 makes the whole transmission mechanism 3 more compact, saves space and is convenient to install.

[0047] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A waterproof electric push rod, comprising a gear box, a motor, a transmission mechanism, an outer tube, a lead screw, an inner tube and a transmission nut, the motor and the transmission mechanism are respectively installed in the gear box, the inner tube is arranged in the outer tube, the lead screw is arranged in the inner tube, the motor is in transmission connection with the lead screw through the transmission mechanism, the lead screw is in threaded connection with the transmission nut, and the transmission nut is in fixed connection with the inner tube, characterized in that: Further comprise a first sealing ring, the gear box comprises a bottom cover and a top cover, the bottom cover and the top cover are matched with each other, and an installation cavity for installing the motor and the transmission mechanism is formed between the two, a first longitudinal groove is arranged on the bottom cover, a second longitudinal groove is arranged on the top cover, the first groove and the second groove are matched to form a limiting groove, the first sealing ring is embedded in the limiting groove, and is sleeved on the outer pipe, the upper surface of the bottom cover is concave downward to form a first U-shaped groove, the lower surface of the top cover is concave upward to form a second U-shaped groove, and the first U-shaped groove and the second U-shaped groove are matched to form a sealing area for injecting waterproof glue. ​ 2. A waterproof electric push rod according to claim 1, characterized in that: Further comprise a cover and a second sealing ring, the cover is fixed on one end of the outer pipe, a through hole is formed in the cover for the inner pipe to pass through, and an installation groove is arranged on the inner wall of the through hole; the second sealing ring is embedded in the installation groove, and is in close contact with the outer wall of the inner pipe.

3. A waterproof electric push rod according to claim 2, characterized in that: The cover is further provided with a flange extending into the outer pipe, and an annular clamping groove is formed between the flange and the inner wall of the cover, so that the outer pipe can be clamped into the annular clamping groove, and the annular clamping groove is filled with waterproof glue.

4. The waterproof electric push rod according to claim 1, characterized in that: The bottom cover or the top cover is respectively fixed with an installation plate on both sides, and the installation plate is provided with an installation hole.

5. The waterproof electric push rod according to claim 1, characterized in that: The waterproof electric push rod further comprises a stroke limiting assembly, the stroke limiting assembly comprises an FPC circuit board, a metal contact piece and a limiting point, the FPC circuit board is attached to the inner wall of the outer pipe, the metal contact piece is fixed on the transmission nut, and the limiting point is arranged at both ends of the FPC circuit board; under the driving of the motor, the lead screw rotates and drives the inner pipe to make linear reciprocating motion through the transmission nut, when the transmission nut moves to the extreme position, the metal contact piece touches the corresponding limiting point, so that the circuit is interrupted, thereby limiting the stroke of the inner pipe.

6. A waterproof electric push rod according to claim 5, characterized in that: The metal contact piece is riveted on the outer side wall of the transmission nut.

7. A waterproof electric push rod according to claim 5, characterized in that: The transmission mechanism comprises a gear frame, a first gear, a second gear, a third gear and a fourth gear, the first gear, the second gear, the third gear and the fourth gear are rotatably installed on the gear frame, the first gear is connected with the motor output shaft, the second gear is meshed and connected with the first gear, the third gear is meshed and connected with the second gear, the fourth gear is meshed and connected with the third gear, a flat transmission shaft is connected at the center of the fourth gear, one end of the flat transmission shaft extends to the outside of the gear frame and is fixed with the lead screw, so that the motor drives the lead screw to rotate through four-stage gear reduction.

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