Waterproof structure of electric push rod

Abstract

The utility model provides a waterproof structure of an electric push rod, which relates to the technical field of electric drive, and comprises an outer tube, an inner tube and a front end cover, the front end cover is fixed at the front end of the outer tube, the inner tube is arranged on the front end cover in a penetrating manner, the front end cover comprises a front cover base, the side wall of the front cover base is provided with an installation through hole, and the installation through hole is communicated with the interior of the outer tube. A pressure adjusting assembly is installed in the installation groove hole and comprises an installation sleeve, a pressure adjusting spring, a pressure adjusting screw rod, a pressure adjusting piece and a pressure adjusting sliding piece, and the pressure adjusting spring abuts against the position between the pressure adjusting piece and the pressure adjusting sliding piece. Pressure difference between the inside and the outside of the outer tube is adjusted through the pressure adjusting sliding sheet, pressure inside the outer tube is kept constant, and outside air is prevented from entering the outer tube to corrode an electric push rod circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of electric drive, in particular to a waterproof structure of an electric push rod. Background Art

[0002] In the current field of linear drive, electric linear actuators are widely used due to their unique advantages over pneumatic or hydraulic linear actuators. In some applications that require a very high level of waterproofing, the waterproofing requirements for electric linear actuators are high. The usual means of waterproofing are to apply waterproof coatings on the exterior and add sealing rings for sealing and waterproofing. However, in the process of using the electric linear actuator, a large amount of friction heat will be generated under the reciprocating action of the lead screw and the drive nut, and the friction heat will cause the air pressure in the relatively closed outer tube to increase, and this pressure increase will form a pressure difference with the outside of the linear actuator. The long-term existence of this pressure difference will cause the air in the outer tube to gradually escape from the installation gap, resulting in a decrease in the amount of air in the outer tube. After the electric linear actuator stops working and cools down internally, the temperature returns to the same level as the outside temperature, and the lack of air will cause negative pressure inside the outer tube. At this time, the atmospheric pressure outside the electric linear actuator will be greater than the pressure inside the outer tube, so it may cause the possibility of external air entering the outer tube again. In an environment with high humidity, humid air will bring some water vapor into the electric linear actuator and corrode the electric linear actuator circuit. Utility Model Content

[0003] 1. Technical issues to be solved

[0004] In view of the deficiencies in the prior art, the utility model provides a waterproof structure for an electric push rod, which solves the problems raised in the above-mentioned background technology.

[0005] (II) Technical solution

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A waterproof structure of an electric push rod comprises an outer tube, an inner tube and a front end cover, wherein the front end cover is fixed at the front end of the outer tube, the inner tube is passed through the front end cover, the front end cover comprises a front cover base, a mounting through hole is provided on the side wall of the front cover base, the mounting through hole is communicated with the inside of the outer tube, a pressure regulating assembly is installed in the mounting slot hole, the pressure regulating assembly comprises a mounting sleeve and a pressure regulating slide, the mounting sleeve comprises a constant pressure cavity and a pressure regulating cavity which are interconnected and formed, the pressure regulating slide is slidably fitted in the constant pressure cavity, and a constant pressure hole is provided on the lower side of the side wall of the constant pressure cavity.

[0008] Preferably, the pressure regulating assembly also includes a pressure regulating spring, which is in contact between the constant pressure plate and the pressure regulating chamber. A fixed plate is fixed to the top of the pressure regulating chamber, and the upper and lower ends of the pressure regulating spring are respectively in contact between the fixed plate and the pressure regulating slide.

[0009] Preferably, a connecting rod is fixed on the upper side of the pressure regulating slide, a guide plate is fixed on the top of the connecting rod, the guide plate is slidably installed in the pressure regulating cavity, and the two ends of the pressure regulating spring are respectively located between the fixed plate and the guide plate.

[0010] Preferably, a plurality of limiting grooves are arranged on the outer edge of the guide piece, a plurality of guide strips are vertically distributed on the inner wall of the pressure regulating cavity, and the guide strips are arranged in a concave-convex manner in the limiting grooves.

[0011] Preferably, a threaded pressure regulating hole is provided on the fixing plate, a pressure regulating screw is threadedly connected to the threaded pressure regulating hole, a pressure regulating plate is provided at the lower end of the pressure regulating screw, the pressure regulating plate abuts against the top of the pressure regulating spring, a limiting block is provided at the top of the pressure regulating screw, and the limiting block abuts against the top of the fixing plate.

[0012] Preferably, a limit plate is provided between the constant pressure chamber and the pressure regulating chamber, a limit hole is provided in the middle of the limit plate, and the inner diameter of the limit hole is larger than the outer diameter of the connecting rod.

[0013] Preferably, a plurality of communication holes are provided on the fixing plate and the guide plate.

[0014] Preferably, a sealing groove is provided at the front end of the front cover base, and sealing ring 1, sealing ring 2, sealing ring 3 and a buckle cover are installed in the sealing groove, the sealing ring 1 includes a ring body 1, a support ring 1 is extended upward from the top of the ring body 1, the cross-sectional side wall of the support ring 1 is inclined, and a plug-in clamping ring is provided on the top of the support ring 1, the sealing ring 2 includes a ring body 2, a deformation ring groove is provided at the bottom of the ring body 2, and a plug-in clamping groove is provided on the top of the deformation ring groove, the sealing ring 2 is stacked and plugged above the sealing ring 1, and the support ring 1 is plugged into the deformation ring groove Inside, the plug-in clamp is inserted in the plug-in slot, the inclined extrusion deformation ring groove of the support ring one faces the side wall of the inner tube, and the side wall of the extrusion deformation ring groove facing the inner tube side abuts against the outer wall of the inner tube, the top of the sealing ring two extends obliquely toward the inner tube with a sealing toothed ring, and the sealing delay abuts against the outer wall of the inner tube, the sealing ring three includes a ring body three, an extrusion ring is provided on the lower side of the inner wall of the ring body three, and the extrusion ring abuts against the side wall of the sealing toothed ring, the snap-fit ​​cover is threadedly installed on the front cover base, and the snap-fit ​​cover abuts against the upper side of the ring body three.

[0015] Preferably, a threaded hole is provided on the front cover base, and the front cover base is connected to the front end of the outer cover through a threaded hole bolt. A sealing groove is provided at the threaded hole position of the front cover base, and a U-shaped sealing ring gasket and an extrusion support ring are arranged in the sealing groove. The extrusion support ring is inserted in the middle part of the U-shaped sealing ring gasket, and the snap-on cover is in contact with the extrusion support ring.

[0016] (III) Beneficial effects

[0017] The utility model provides a waterproof structure of an electric push rod, which has the following beneficial effects:

[0018] 1. In the utility model, sealing ring 1, sealing ring 2 and sealing ring 3 are installed in the sealing groove at the same time, ring body 1 is placed at the bottom of the sealing groove, support ring 1 is arranged upward, ring body 2 of sealing ring 2 is stacked on ring body 1, support ring 1 extends into the deformation ring groove, and the cross section of support ring 1 is arranged obliquely to extrude the deformation ring groove, so that the deformation ring groove is deformed toward the inner tube direction and is tightly attached to the outer wall of the inner tube, and the angle at which the deformation ring groove abuts against the inner tube is inclined downward, which has a good sealing effect during the contraction process of the inner tube, and the plug-in clamping ring extends into the plug-in clamping ring, and the raised plug-in clamping ring can play a positioning role to ensure that the installation positions of sealing ring 1 and sealing ring 2 are aligned; the sealing toothed ring is tightly attached to the outer wall of the inner tube under the action of the extrusion ring, and the angle at which the sealing toothed ring abuts against the inner tube is inclined upward, which plays a good role during the elongation of the inner tube; at the same time, the U-shaped sealing ring gasket and the extrusion support ring are arranged to squeeze each other, so as to seal and protect the connecting screw hole between the front cover base and the outer tube.

[0019] 2. On the premise that the outer tube, inner tube and front cover base of the electric push rod are sealed by the above technical scheme, a pressure regulating assembly connected to the inside of the outer tube is installed on the front cover base to adjust the pressure inside the outer tube. First, the upper side of the pressure regulating slide is in contact with the outside air through the connecting holes of the fixing plate and the guide plate and the limiting holes of the limiting plate, while the lower side of the pressure regulating slide is in contact with the inside of the outer tube. The pressure inside the outer tube is balanced by the up and down sliding of the pressure regulating slide, so that the pressure difference between the inside of the outer tube and the external air is kept constant, thereby avoiding the situation where the pressure difference between the inside and the outside is too large and air escapes.

[0020] 3. In the utility model, the pressure-regulating screw can be rotated at the same time, so that the pressure-regulating sheet connected to the pressure-regulating screw squeezes the pressure-regulating spring, and the lower end of the pressure-regulating spring contacts the guide sheet, that is, indirectly pressurizing the pressure-regulating slide, so that the top of the pressure-regulating slide receives the compensating pressure from the pressure-regulating spring in addition to the atmospheric pressure. Through the pressure balance of the pressure-regulating slide, the air pressure inside the outer tube is maintained at the sum of the atmospheric pressure and the pressure of the pressure-regulating spring, and the pressure inside the outer tube can always be maintained at a slightly greater than atmospheric pressure, that is, positive pressure, so that even if the air inside the outer tube forms an outward trend, it will not escape from the installation gap, so that the outside air cannot enter the inner part of the outer tube.

[0021] 4. At the same time, the pressure regulating component can be used to maintain high external pressure on the electric push rod from the outside. The high external air pressure replaces the atmospheric pressure and is connected to the upper side of the pressure regulating slide. Through the high pressure, the pressure regulating slide continues to slide downward and slides down to the constant pressure hole. The connection between the inside of the outer tube and the outside is completed, and the pressure of the outer tube is maintained. It can be used for the sealing detection of the electric push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an exploded schematic diagram of a waterproof structure of an electric push rod of the utility model;

[0023] Figure 2 It is an exploded schematic diagram of the front end cover in the utility model;

[0024] Figure 3 for Figure 2 A cross-sectional view of

[0025] Figure 4 It is a partial cross-sectional view of the front end cover seat in the utility model;

[0026] Figure 5 It is a cross-sectional view of the front cover base in the utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the voltage regulating assembly in the utility model;

[0028] Figure 7 for Figure 6 sectional view of .

[0029] In the figure: 1. outer tube; 2. inner tube; 3. front cover base; 4. sealing ring 1; 5. sealing ring 2; 6. sealing ring 3; 7. support ring 1; 8. deformation ring groove; 9. snap-fit ​​cover; 10. extrusion ring; 11. sealing gear ring; 12. U-shaped sealing ring gasket; 13. extrusion support ring; 14. pressure-regulating slide; 15. pressure-regulating spring; 16. constant pressure chamber; 17. pressure-regulating chamber; 18. fixing plate; 19. pressure-regulating screw; 20. pressure-regulating plate; 21. connecting rod; 22. guide plate; 23. limit plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] The utility model provides a waterproof structure of an electric push rod.

[0032] like Figure 1 , 2As shown in , it comprises an outer tube 1, an inner tube 2 and a front end cover, the front end cover is fixed at the front end of the outer tube 1, the inner tube 2 is inserted into the front end cover, the front end cover comprises a front cover base 3, a sealing groove is provided at the front end of the front cover base 3, a sealing ring 4, a sealing ring 5, a sealing ring 6 and a buckle cover 9 are installed in the sealing groove, the sealing ring 4 comprises a ring body 1, a support ring 7 is extended upward from the top of the ring body 1, the cross-sectional side wall of the support ring 7 is inclined, a plug-in clamping ring is provided on the top of the support ring 7, the sealing ring 2 5 comprises a ring body 2, a deformation ring groove 8 is provided at the bottom of the ring body 2, a plug-in clamping groove is provided on the top of the deformation ring groove 8, the sealing ring 2 5 is stacked and plugged above the sealing ring 4, the support ring 1 7 is plugged in the deformation ring groove 8, the plug-in clamping ring is plugged in the plug-in clamping groove, the support ring 1 7 is inclined to extrude the deformation ring groove 8 toward the inner tube 2. The side wall of the inner tube 2 is formed on the side wall of the inner tube 2, and the side wall of the extrusion deformation ring groove 8 is in contact with the outer wall of the inner tube 2. The top of the sealing ring 2 5 is obliquely extended toward the inner tube 2 with a sealing tooth ring 11, and the sealing tooth is in contact with the outer wall of the inner tube 2. The sealing ring 3 6 includes a ring body 3, and an extrusion ring 10 is provided on the lower side of the inner wall of the ring body 3. The extrusion ring 10 is in contact with the side wall of the sealing tooth ring 11. The snap-fit ​​cover 9 is threadedly installed on the front cover base 3, and the snap-fit ​​cover 9 is in contact with the upper side of the ring body 3. A threaded hole is provided on the front cover base 3, and the front cover base 3 is connected to the front end of the outer cover base 3 through a threaded hole bolt. A sealing groove is provided at the threaded hole position of the front cover base 3, and a U-shaped sealing ring gasket 12 and an extrusion support ring 13 are arranged in the sealing groove. The extrusion support ring 13 is inserted in the middle of the U-shaped sealing ring gasket 12, and the snap-fit ​​cover 9 is in contact with the extrusion support ring 13.

[0033] like Figure 1 , 4, 5, 6, and 7, a mounting through hole is provided on the side wall of the front cover base 3, and the mounting through hole includes a constant pressure through hole with a smaller aperture and a pressure regulating through hole with a larger aperture, the mounting through hole is connected to the interior of the outer tube 1, and a pressure regulating assembly is installed in the mounting slot, and the pressure regulating assembly includes a mounting sleeve, a pressure regulating slide 14, and a pressure regulating spring 15. The mounting sleeve includes a constant pressure chamber 16 and a pressure regulating chamber 17 that are interconnected and formed, and the outer diameter of the constant pressure chamber 16 is smaller than the outer diameter of the pressure regulating chamber 17, and the constant pressure chamber 16 is plugged into the constant pressure through hole The pressure regulating chamber 17 is inserted into the pressure regulating through hole, and two annular grooves are provided on the outer wall of the pressure regulating chamber 17. A sealing ring is clamped on the annular groove, and the sealing ring abuts against the inside of the pressure regulating through hole. The pressure regulating through hole and the pressure regulating chamber 17 are provided with mutually connected threads, and the pressure regulating slide 14 is slidably mounted in the constant pressure chamber 16. The outer aid of the pressure regulating slide 14 is provided with a slide groove, and a sliding sealing ring is provided on the outer ring of the slide groove, and the sliding sealing ring abuts against the inner wall of the constant pressure chamber 16, and the side wall of the constant pressure chamber 16 A constant pressure hole is provided on the lower side, a fixing plate 18 is fixed on the top of the pressure regulating chamber 17, a plurality of connecting holes are provided on the fixing plate 18, a threaded pressure regulating hole is provided on the fixing plate 18, a pressure regulating screw 19 is threadedly connected to the threaded pressure regulating hole, a pressure regulating plate 20 is provided at the lower end of the pressure regulating screw 19, the pressure regulating plate 20 abuts against the top of the pressure regulating spring 15, a limiting block is provided at the top of the pressure regulating screw 19, a connecting rod 21 is fixed on the upper side of the pressure regulating slide 14, a guide plate 22 is fixed on the top of the connecting rod 21, and the guide plate A plurality of connecting holes are provided on 22, the guide piece 22 is slidably installed in the pressure regulating chamber 17, a plurality of limiting grooves are provided on the outer edge of the guide piece 22, a plurality of guide strips are vertically distributed on the inner wall of the pressure regulating chamber 17, the guide strips are concave-convexly provided in the limiting grooves, the two ends of the pressure regulating spring 15 are respectively located between the pressure regulating plate 20 and the guide piece, a limiting plate 23 is provided between the constant pressure chamber 16 and the pressure regulating chamber 17, a limiting hole is provided in the middle of the limiting plate 23, and the inner diameter of the limiting hole is larger than the outer diameter of the connecting rod 21.

[0034] Working principle: In the utility model, during the practical use of the electric push rod, the friction heat generated will cause the air in the outer tube 1 to expand, thereby increasing the pressure in the outer tube 1. When the pressure in the outer tube 1 increases, the pressure imbalance received at both ends of the pressure-regulating slide 14 will push the pressure-regulating slide 14 to rise in the constant-pressure chamber 16. When the pressure-regulating slide rises, the volume of the constant-pressure chamber 16 connected to the inside of the outer tube 1 increases, so as to increase the pressure in the smaller space, reduce the pressure difference between the inside and outside of the outer tube 1, and avoid air escape caused by long-term high pressure difference. Rotating the pressure-regulating screw 19 can make the pressure-regulating slide squeeze the pressure-regulating spring 15 downward, and the pressure-regulating spring 15 is pressurized on the upper side of the pressure-regulating slide 14 through the guide plate 22 and the connecting rod 21, so that the force on the upper side of the pressure-regulating slide 14 is the sum of the atmospheric pressure and the pressure of the pressure-regulating spring 15, so that the pressure inside the outer tube 1 is slightly higher than the external atmospheric pressure without causing air escape, so that the air inside the outer tube 1 tends to move outward, and outside air is prevented from entering the outer tube 1.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waterproof structure of an electric push rod, comprising an outer tube, an inner tube and a front end cover, wherein the front end cover is fixed to the front end of the outer tube, and the inner tube is passed through the front end cover, characterized in that: The front end cover includes a front cover base, a side wall of the front cover base is provided with a mounting hole, the mounting hole is connected to the interior of the outer tube, a pressure regulating assembly is installed in the mounting hole, the pressure regulating assembly includes a mounting sleeve and a pressure regulating slide, the mounting sleeve includes a constant pressure cavity and a pressure regulating cavity which are connected to each other, the pressure regulating slide is slidably installed in the constant pressure cavity, and a constant pressure hole is provided on the lower side of the side wall of the constant pressure cavity.

2. The waterproof structure of an electric push rod according to claim 1, characterized in that: The pressure regulating assembly also includes a pressure regulating spring, which is in contact between the constant pressure plate and the pressure regulating cavity. A fixing plate is fixed to the top of the pressure regulating cavity. The upper and lower ends of the pressure regulating spring are respectively in contact between the fixing plate and the pressure regulating sliding plate.

3. The waterproof structure of an electric push rod according to claim 2, characterized in that: A connecting rod is fixed on the upper side of the pressure regulating slide, a guide piece is fixed on the top of the connecting rod, the guide piece is slidably mounted in the pressure regulating cavity, and the two ends of the pressure regulating spring are respectively located between the fixed piece and the guide piece.

4. The waterproof structure of an electric push rod according to claim 3, characterized in that: The outer edge of the guide piece is provided with a plurality of limiting grooves, and the inner wall of the pressure regulating cavity is vertically provided with a plurality of guide strips, and the guide strips are arranged in a concave-convex manner in the limiting grooves.

5. The waterproof structure of an electric push rod according to claim 4, characterized in that: A threaded pressure regulating hole is provided on the fixing plate, a pressure regulating screw is threadedly connected to the threaded pressure regulating hole, a pressure regulating plate is provided at the lower end of the pressure regulating screw, the pressure regulating plate abuts against the top of the pressure regulating spring, a limiting block is provided at the top of the pressure regulating screw, and the limiting block abuts against the top of the fixing plate.

6. The waterproof structure of an electric push rod according to claim 5, characterized in that: A limit plate is arranged between the constant pressure chamber and the pressure regulating chamber, a limit hole is arranged in the middle of the limit plate, and the inner diameter of the limit hole is larger than the outer diameter of the connecting rod.

7. The waterproof structure of an electric push rod according to claim 6, characterized in that: A plurality of communication holes are provided on the fixing plate and the guide plate.

8. The waterproof structure of an electric push rod according to claim 1, characterized in that: The front end of the front cover base is provided with a sealing groove, in which sealing ring 1, sealing ring 2, sealing ring 3 and a buckle cover are installed, the sealing ring 1 includes a ring body 1, the top of the ring body 1 extends upward with a support ring 1, the cross-sectional side wall of the support ring 1 is inclined, and a plug-in clamping ring is provided on the top of the support ring 1, the sealing ring 2 includes a ring body 2, the bottom of the ring body 2 is provided with a deformation ring groove, the top of the deformation ring groove is provided with a plug-in clamping groove, the sealing ring 2 is stacked and plugged above the sealing ring 1, and the support ring 1 is plugged into the deformation ring groove, The plug-in clamp is inserted in the plug-in clamping groove, the inclined extrusion deformation ring groove of the support ring one faces the side wall of the inner tube, and the side wall of the extrusion deformation ring groove facing the inner tube side abuts against the outer wall of the inner tube, the top of the sealing ring two is inclinedly extended toward the inner tube with a sealing toothed ring, and the sealing toothed ring abuts against the outer wall of the inner tube, the sealing ring three includes a ring body three, an extrusion ring is provided on the lower side of the inner wall of the ring body three, and the extrusion ring abuts against the side wall of the sealing toothed ring, and the snap-fit ​​cover is threadedly installed on the front cover base, and the snap-fit ​​cover abuts against the upper side of the ring body three.

9. The waterproof structure of an electric push rod according to claim 8, characterized in that: A threaded hole is provided on the front cover base, and the front cover base is connected to the front end of the outer cover through a threaded hole bolt. A sealing groove is provided at the threaded hole position of the front cover base, and a U-shaped sealing ring gasket and an extrusion support ring are arranged in the sealing groove. The extrusion support ring is inserted in the middle part of the U-shaped sealing ring gasket, and the snap-on cover is in contact with the extrusion support ring.

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