Electric push rod

Abstract

The invention relates to the technical field of push rods, in particular to an electric push rod which comprises a shell, a bottom box is mounted at the bottom of the shell, a motor is mounted on the side wall of the shell, a driving gear is arranged at the output end of the motor, and a plurality of driven gears are rotationally connected into the bottom box. The multiple driven gears are connected with the driving gear in a meshed mode, the driven gear on the outer side is provided with a driving gear in a meshed mode, the driving gear is provided with a lead screw, the outer side wall of the lead screw is in threaded connection with a base, and the base is provided with a push rod. When the push rod is pushed out to be close to the limit length, the friction piece can make contact with the protruding block at the moment, friction force is gradually generated, the push rod is slowly decelerated, the situation that the driving gear, the driven gear and the driving gear are impacted by inertia generated by too high retraction speed of the push rod is avoided, and safe use of the whole equipment is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of push rods, in particular to an electric push rod. Background Art

[0002] An electric push rod is an electric drive device that converts the rotational motion of an electric motor into linear reciprocating motion of a push rod. An electric push rod, also known as a linear drive, is a new type of actuator that can convert the rotational power of a motor into linear motion. It drives the lead screw nut structure through the internal gear or worm gear reduction system to achieve linear reciprocating motion of the push rod. This conversion mechanism makes electric push rods widely used in a variety of industrial and life fields.

[0003] When the electric push rod is in use, the existing electric push rod usually does not have a deceleration device. When a heavy object is connected to the end of the electric push rod and the heavy object moves under the action of the electric push rod, it has a certain inertia. When the electric push rod reaches the limit length and starts to retract, if the speed is too fast or there is no appropriate buffering measure, the heavy object will continue to move forward due to inertia, thereby impacting the push rod, causing the gears inside the electric push rod to clash, affecting the use of the entire electric push rod. In addition, the existing electric push rod lacks a cleaning device inside. When the electric push rod is used externally, the surface of the extended push rod portion is usually stained with dust and other impurities. Although an oil seal is provided at the end of the existing push rod, if these impurities are not cleaned, the push rod will continue to accumulate dust on the oil seal when it retracts. When a lot of dust and impurities accumulate on the surface of the oil seal, the friction between the oil seal and the push rod will increase, which may cause the entire push rod to become stuck. At the same time, the existing push rod does not have an automatic maintenance device. When the push rod is maintained, it is still necessary to manually apply lubricant to the surface of the push rod, which is time-consuming and laborious. Summary of the invention

[0004] The purpose of the present invention is to provide an electric push rod to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electric push rod comprises a shell, a bottom box is installed at the bottom of the shell, a motor is installed at the side wall of the shell, a driving gear is arranged at the output end of the motor, a driven gear and a side gear are rotatably arranged inside the bottom box, a driving gear is also rotatably connected inside the bottom box, the driving gear and the side gear are meshed with each other, the side gear is meshed with the driven gear, the driven gear is meshed with the driving gear, a screw rod is installed on the driving gear, a base is threadedly connected on the outer side wall of the screw rod, a push rod is arranged on the base, a limiting member is installed on the bottom box, and the side wall of the base is slidably connected to the limiting member;

[0006] The deceleration mechanism is arranged on both sides of the base to prevent the push rod from retracting too quickly and causing inertial shaking;

[0007] The cooling mechanism cools down the inside of the shell while the push rod reciprocates and retracts, preventing the entire device from shutting down due to overheating caused by high temperature inside the shell;

[0008] The cleaning mechanism scrapes and cleans the surface of the push rod to prevent the push rod from getting stuck when it is extended.

[0009] Preferably, the deceleration mechanism includes friction parts fixedly connected to both sides of the base, the top of the outer shell is fixedly connected to a maintenance box, both sides of the bottom of the maintenance box are fixedly connected to external brackets, the outer side wall of the external bracket is fixedly connected to an elastic telescopic rod, and the end of the elastic telescopic rod is fixedly connected to a protrusion.

[0010] Preferably, the cooling mechanism includes a plurality of mounting columns fixedly connected to the outside of the maintenance box, the ends of the mounting columns are fixedly connected to positioning rings, the side walls of the positioning rings are fixedly connected to a plurality of mounting platforms, the interiors of the plurality of mounting platforms are fixedly connected to spray barrels, the inner side wall of the spray barrel is slidably connected to a piston rod, a pressure spring is sleeved on the outer side wall of the piston rod, an end of the spray barrel away from the piston rod is connected to an injection pipe, the other end of the injection pipe is connected to the interior of the outer shell, and the interior of the spray barrel is connected to an air intake hole.

[0011] Preferably, the cleaning mechanism includes a cleaning box fixedly connected in the maintenance box, a plurality of pressing plates are fixedly connected to the outside of the cleaning box, the plurality of pressing plates are respectively in contact with the ends of a plurality of piston rods, electric adjusting rods are fixedly connected on both sides of the interior of the cleaning box, a scraper is fixedly connected to the end of the electric adjusting rod, and the scraper is in sliding contact with the surface of the push rod.

[0012] Preferably, both sides of the maintenance box are fixedly connected with mounting plates, the outer side wall of the mounting plate is fixedly connected with a driving motor, the output end of the driving motor is provided with a rotating wheel, the rotating wheel is rotatably connected with a swing arm, the end of the swing arm away from the rotating wheel is rotatably connected to the outer side wall of the cleaning box, a plurality of side boxes are fixedly connected to the outer side wall of the rotating wheel, the inner side walls of the plurality of side boxes are slidably connected with pushing magnets, a pressure spring is fixedly connected to the outer side wall of the pushing magnet, and the end of the pressure spring away from the pushing magnet is connected to the inner wall of the side box.

[0013] Preferably, a scraping sponge is slidably connected to both sides of the interior of the positioning ring, a connecting plate is fixedly connected to the outer wall of the scraping sponge, an extrusion rod is fixedly connected to the outer wall of the connecting plate, the extrusion rod extends to the outside of the positioning ring, a damping spring is sleeved on the extrusion rod, the end of the extrusion rod away from the protrusion is fixedly connected to a side plate, a trigger magnet is fixedly connected to the outer wall of the side plate, and the magnetic poles of the trigger magnet are the same as those of the pushing magnet.

[0014] Preferably, trigger members are fixedly connected to both sides of the scraping sponge, a limiting track is provided on the trigger member, a dripping hole is provided on the limiting track, a liquid storage cavity is provided above the positioning ring, a plurality of slide bars corresponding to the trigger member are slidably connected to the inner wall of the liquid storage cavity, a return spring is sleeved on the outer wall of the slide bar, a circulation hole is provided inside the return spring, a side of the slide bar close to the liquid storage cavity is sealed, a liquid filling tube is provided in communication with the inside of the liquid storage cavity, and the liquid filling tube extends to the outside of the maintenance box.

[0015] Preferably, the outer shell is provided with a dustproof and heat dissipation port, the maintenance box is provided with a flip door, and the flip door is hollowed out.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Through the setting of friction parts, convex blocks and other mechanisms, when the push rod is loaded with heavy objects and pushed out to a length close to the limit, the friction parts will come into contact with the convex blocks, gradually generating friction force, and decelerating the push rod more gently, avoiding the push rod from retracting too fast and generating inertial impact on the driving gear, driven gear and driving gear, thus ensuring the safe use of the entire equipment.

[0018] 2. Through the setting of mechanisms such as scrapers and spray guns, when the push rod extends or retracts, the scraper will scrape the surface of the push rod back and forth to clean the impurities on the surface of the push rod to prevent dust and impurities from causing the push rod to become stuck. While the scraper scrapes the surface of the push rod back and forth, the spray gun will blow air into the outer shell to cool down the inside of the outer shell to prevent the entire equipment from overloading due to high temperature. When the surface of the push rod needs to be maintained, it is only necessary to increase the speed of the drive motor. At this time, under the action of magnetic force, the scraping sponge will absorb the lubricating liquid and evenly apply it to the surface of the push rod. Compared with manual application, it is more efficient and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0021] Figure 3It is a schematic diagram of the bottom structure of the present invention;

[0022] Figure 4 It is a schematic diagram of the base structure of the present invention;

[0023] Figure 5 Schematic diagram of the internal structure of the maintenance box of the present invention Figure 1 ;

[0024] Figure 6 Schematic diagram of the internal structure of the maintenance box of the present invention Figure 2 ;

[0025] Figure 7 Schematic diagram of the internal structure of the maintenance box of the present invention Figure 3 ;

[0026] Figure 8 It is a schematic diagram of the planar structure of the present invention;

[0027] Fig. 9 It is a schematic diagram of the local structure of the positioning ring of the present invention;

[0028] Fig.10 for Fig. 9 A magnified view of middle;

[0029] Fig.11 It is a schematic diagram of the internal structure of the positioning ring of the present invention;

[0030] Fig.12 It is a schematic diagram of the local structure of the present invention

[0031] In the attached drawings, the parts represented by the reference numerals are as follows: 1. housing; 2. dust-proof heat dissipation port; 3. maintenance box; 4. motor; 5. push rod; 6. limiter; 7. screw rod; 8. bottom box; 9. base; 10. driven gear; 11. driving gear; 12. driving gear; 13. outer bracket; 14. bump; 15. elastic telescopic rod; 16. friction member; 17. driving motor; 18. rotating wheel; 19. side box; 20. swing arm; 21. cleaning box; 22. scraper; 23. electric adjustment lever; 24. press Plate; 25, positioning ring; 26, spray gun; 27, spray tube; 28, pressing spring; 29, piston rod; 30, filling tube; 31, extrusion rod; 32, side plate; 33, liquid storage chamber; 34, scraping sponge; 35, trigger; 36, limit track; 37, drip hole; 38, slide bar; 39, reset spring; 40, flow hole; 41, connecting plate; 42, trigger magnet; 43, push magnet; 44, pressure spring; 45, suction hole; 46, damping spring; 47, flip door; 48, side gear. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1: Please refer to Figure 1 - Fig.12 , an electric push rod shown in the figure includes a shell 1, a bottom box 8 is installed at the bottom of the shell 1, a motor 4 is installed on the side wall of the shell 1, a driving gear 11 is provided at the output end of the motor 4, a driven gear 10 and a side gear 48 are rotated inside the bottom box 8, and a driving gear 12 is also rotatably connected inside the bottom box 8, the driving gear 11 and the side gear 48 are meshed and connected with each other, the side gear 48 is meshed and connected with the driven gear 10, and the driven gear 10 is meshed and connected with the driving gear 12, a screw rod 7 is installed on the driving gear 12, a base 9 is threadedly connected on the outer wall of the screw rod 7, a push rod 5 is provided on the base 9, a limiting member 6 is installed on the bottom box 8, and the side wall of the base 9 is slidably connected to the limiting member 6; a speed reduction mechanism is arranged on both sides of the base 9 to prevent the push rod 5 from retracting too quickly and causing inertial shaking, and the speed reduction mechanism includes friction members 16 (such as Figure 4 As shown in the figure, a maintenance box 3 is fixedly connected to the top of the shell 1, and both sides of the bottom of the maintenance box 3 are fixedly connected to an outer bracket 13, and an elastic telescopic rod 15 is fixedly connected to the outer wall of the outer bracket 13, and a protrusion 14 is fixedly connected to the end of the elastic telescopic rod 15; a cooling mechanism cools the inside of the shell 1 while the push rod 5 reciprocates to extend and retract, so as to prevent the high temperature in the shell 1 from causing the entire equipment to heat up and shut down, and the cooling mechanism includes a plurality of mounting columns fixedly connected to the outside of the maintenance box 3, and the ends of the mounting columns are fixedly connected to a positioning ring 25, and the side walls of the positioning ring 25 are fixedly connected to a plurality of mounting platforms, and the interiors of the plurality of mounting platforms are fixedly connected to a spray gun 26, and the inner side wall of the spray gun 26 is slidably connected to a piston rod 29, and a pressing spring 28 is sleeved on the outer side wall of the piston rod 29, and the end of the spray gun 26 away from the piston rod 29 is connected to a spray pipe 27, and the other end of the spray pipe 27 is connected to the interior of the shell 1, and the interior of the spray gun 26 is connected to an air suction hole 45 (as shown in the figure). Figure 8 shown).

[0034] In this embodiment, when in use, the operator can first turn on the motor 4 to drive the driving gear 11 to rotate. When the driving gear 11 rotates, the driving gear 12 drives the screw rod 7 to rotate under the transmission of the side gear 48 and the driven gear 10. The mutual meshing transmission of the side gear 48, the driven gear 10 and the driving gear 11 can better transmit the power generated by the motor 4 to the driving gear 12, thereby increasing the torque of the driving gear 12. When the screw rod 7 rotates, the base 9 pushes the push rod 5 to reciprocate. When the base 9 pushes the push rod 5 to extend to a length close to the limit, the friction members 16 on both sides of the base 9 will contact the protrusions 14. Since the contact ends of the friction members 16 are inclined (such as Figure 4 As shown in the figure, as the base 9 is pushed, the protrusion 14 slowly contacts the friction member 16 along the bevel, and under the elastic pressure of the elastic telescopic rod 15, the contact with the friction member 16 becomes tighter and tighter. Since the contact ends of the protrusion 14 and the friction member 16 are both made of frosted material, when the two contact each other more and more tightly, the friction force generated will gradually increase. When the power of the motor 4 is constant, when the base 9 is subjected to the friction force, the speed of pushing the push rod 5 will gradually slow down accordingly, thereby performing a relatively gentle deceleration on the push rod 5, avoiding the push rod 5 from retracting too fast to generate inertial impact on the driving gear 11, the driven gear 10 and the driving gear 12, thereby ensuring the safe use of the entire equipment.

[0035] Example 2: Please refer to Figure 1 - Fig.12, the cleaning mechanism shown in the figure scrapes and cleans the surface of the push rod 5 to prevent the push rod 5 from getting stuck when it is extended. The cleaning mechanism includes a cleaning box 21 fixedly connected to the maintenance box 3, and a plurality of pressing plates 24 are fixedly connected to the outside of the cleaning box 21. The plurality of pressing plates 24 are respectively in contact with the ends of a plurality of piston rods 29. Both sides of the interior of the cleaning box 21 are fixedly connected to electric adjustment rods 23, and the ends of the electric adjustment rods 23 are fixedly connected to scrapers 22. The scrapers 22 are in sliding contact with the surface of the push rod 5. Both sides of the maintenance box 3 are fixedly connected to mounting plates, and a driving motor 17 is fixedly connected to the outer wall of the mounting plate. A rotating wheel 18 is provided at the output end of the driving motor 17, and a swing arm 20 is rotatably connected to the rotating wheel 18, and the swing arm 20 is away from the rotating wheel. One end of the wheel 18 is rotatably connected to the outer wall of the cleaning box 21, and a plurality of side boxes 19 are fixedly connected to the outer wall of the rotating wheel 18. The inner walls of the plurality of side boxes 19 are slidably connected with a pushing magnet 43, and a pressure spring 44 is fixedly connected to the outer wall of the pushing magnet 43. One end of the pressure spring 44 away from the pushing magnet 43 is connected to the inner wall of the side box 19, and a scraping sponge 34 is slidably connected to both sides of the interior of the positioning ring 25. A connecting plate 41 is fixedly connected to the outer wall of the scraping sponge 34, and an extrusion rod 31 is fixedly connected to the outer wall of the connecting plate 41. The extrusion rod 31 penetrates to the outside of the positioning ring 25, and a damping spring 46 is sleeved on the extrusion rod 31. The end of the extrusion rod 31 away from the connecting plate 41 is fixedly connected to the side plate 32.

[0036] A trigger magnet 42 is fixedly connected to the outer wall of the side plate 32, and the magnetic poles of the trigger magnet 42 are the same as those of the pushing magnet 43. Trigger members 35 are fixedly connected to both sides of the scraping sponge 34. A limit track 36 is provided on the trigger member 35, and a drip hole 37 is provided on the limit track 36. A liquid storage chamber 33 is provided above the positioning ring 25. A plurality of slide bars 38 corresponding to the trigger member 35 are slidably connected to the inner wall of the liquid storage chamber 33. A reset spring 39 is sleeved on the outer wall of the slide bar 38, and a flow hole 40 is provided inside the reset spring 39. The side of the slide bar 38 close to the liquid storage chamber 33 is sealed, and a liquid adding pipe 30 is provided in communication with the inside of the liquid storage chamber 33. The liquid adding pipe 30 extends to the outside of the maintenance box 3. A dustproof and heat dissipation port 2 is provided on the outer shell 1. A flip door 47 is flipped on the maintenance box 3, and the flip door 47 is hollow.

[0037] In this embodiment, when the surface of the push rod 5 needs to be cleaned, the operator can turn on the drive motor 17 to drive the rotating wheel 18 to rotate. When the rotating wheel 18 rotates, the cleaning box 21 is driven to reciprocate up and down through the swing arm 20 (refer to Figure 5), when the cleaning box 21 reciprocates, the scraper 22 will reciprocate to scrape the surface of the push rod 5, and the dust and impurities on the surface of the push rod 5 will be scraped off and left in the cleaning box 21. When the cleaning box 21 reciprocates, the multiple pressing plates 24 fixed on the surface of the cleaning box 21 will also reciprocate to press the piston rod 29, so that the piston rod 29 performs a reciprocating suction movement in the nozzle 26. When the piston rod 29 performs a reciprocating suction movement in the nozzle 26, air will be sucked into the nozzle 26 through the suction hole 45, and finally sprayed into the interior of the shell 1 through the jet pipe 27, so as to cool down the inside of the shell 1. (It should be noted that both the jet pipe 27 and the suction hole 45 are provided with a one-way valve to ensure that the jet pipe 27 only sprays air and the suction hole 45 only inhales air).

[0038] During use, when the push rod 5 needs to be maintained, the operator can control the electric adjustment rod 23 to retract, so that the scraper 22 is divided into two and out of contact with the push rod 5. Then the operator can increase the power of the drive motor 17 to drive the wheel 18 to rotate rapidly. When the wheel 18 rotates rapidly, the large centrifugal force generated will cause the pushing magnet 43 to overcome the elastic force of the pressure spring 44 and move to the outside of the side box 19. When the pushing magnet 43 moves to the outside of the side box 19 and as the wheel 18 rotates to the positive side of the triggering magnet 42, the distance between the two becomes closer. Under the action of the repelling magnetic force, the extrusion rods 31 on both sides will overcome the elastic force of the damping spring 46 and push the scraping sponge 34 to close to the middle of the positioning ring 25 and contact with the surface of the push rod 5. When the scraping sponge When the trigger member 35 pushes the slide bar 38, the slide bar 38 will slowly move toward the inside of the liquid storage chamber 33 along its contact bevel until the circulation hole 40 enters the liquid storage chamber 33. After the circulation hole 40 enters the liquid storage chamber 33, as the trigger member 35 continues to push, the bottom open end of the slide bar 38 will coincide with the drip hole 37. At this time, the lubricating liquid stored in the liquid storage chamber 33 will enter the slide bar 38 through the circulation hole 40, and finally enter the drip hole 37 through the transportation of the slide bar 38, and finally be absorbed by the scraping sponge 34. When the scraping sponge 34 absorbs the lubricating liquid, it will smear the lubricating liquid on the surface of the push rod 5 when it contacts with the push rod 5, so as to maintain the push rod 5.

[0039] It should be noted that the damping spring 46 contracts quickly and rebounds slowly. When the pushing magnet 43 that is thrown to the outside of the side box 19 comes to the front side of the trigger magnet 42, under the above principle, a repulsive magnetic force will be generated to push the extrusion rod 31 to move. On the contrary, when the pushing magnet 43 rotates with the side box 19 to move away from the front side of the trigger magnet 42, the slower rebound speed of the damping spring 46 will not be able to return the extrusion rod 31 to its original position, and the pushing magnet 43 will come to the side of the trigger magnet 42 again. Therefore, as long as the rotating wheel 18 rotates quickly, the extrusion rod 31 will continue to push the scraping sponge 34 to close in the middle of the positioning ring 25 to maintain the push rod 5.

[0040] It should be noted that observation Fig.10 The bottom opening end of the slide bar 38 is much larger than the dripping hole 37, so when the two overlap, the slide bar 38 will not be inserted into the dripping hole 37, and the slide bar 38 can be separated from the dripping hole 37 at any time.

[0041] It should be noted that when the cleaning box 21 is full of impurities, the flip door 47 can be flipped open for cleaning.

[0042] 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. An electric push rod, comprising a housing (1), characterized in that: A bottom box (8) is installed at the bottom of the shell (1), a motor (4) is installed on the side wall of the shell (1), a driving gear (11) is provided at the output end of the motor (4), a driven gear (10) and a side gear (48) are rotatably provided inside the bottom box (8), a driving gear (12) is also rotatably connected inside the bottom box (8), the driving gear (11) and the side gear (48) are meshedly connected with each other, the side gear (48) is meshedly connected with the driven gear (10), the driven gear (10) is meshedly connected with the driving gear (12), a screw rod (7) is installed on the driving gear (12), a base (9) is threadedly connected on the outer side wall of the screw rod (7), a push rod (5) is provided on the base (9), a limiting member (6) is installed on the bottom box (8), and the side wall of the base (9) is slidably connected with the limiting member (6); The deceleration mechanism is arranged on both sides of the base (9) to prevent the push rod (5) from retracting too quickly and causing inertial shaking; The cooling mechanism cools the inside of the housing (1) while the push rod (5) reciprocates to extend and retract, thereby preventing the entire device from shutting down due to overheating caused by high temperature inside the housing (1); The cleaning mechanism scrapes and cleans the surface of the push rod (5) to prevent the push rod (5) from getting stuck when it is extended.

2. The electric push rod according to claim 1, characterized in that: The deceleration mechanism comprises a friction member (16) fixedly connected to both sides of the base (9); the top of the housing (1) is fixedly connected to a maintenance box (3); both sides of the bottom of the maintenance box (3) are fixedly connected to an external bracket (13); an elastic telescopic rod (15) is fixedly connected to the outer wall of the external bracket (13); and a protrusion (14) is fixedly connected to the end of the elastic telescopic rod (15).

3. The electric push rod according to claim 1, characterized in that: The cooling mechanism comprises a plurality of mounting columns fixedly connected to the outside of the maintenance box (3), the ends of the mounting columns being fixedly connected to positioning rings (25), the side walls of the positioning rings (25) being fixedly connected to a plurality of mounting platforms, the interiors of the plurality of mounting platforms being fixedly connected to spray barrels (26), the inner side walls of the spray barrels (26) being slidably connected to a piston rod (29), the outer side walls of the piston rods (29) being sleeved with a pressing spring (28), the end of the spray barrel (26) away from the piston rod (29) being connected to an injection pipe (27), the other end of the injection pipe (27) being connected to the interior of the housing (1), and the interior of the spray barrel (26) being connected to an air intake hole (45).

4. The electric linear actuator according to claim 1, characterized in that: The cleaning mechanism comprises a cleaning box (21) fixedly connected in the maintenance box (3); a plurality of pressing plates (24) are fixedly connected to the outside of the cleaning box (21); the plurality of pressing plates (24) are respectively in contact with the ends of a plurality of piston rods (29); both sides of the inside of the cleaning box (21) are fixedly connected with electric adjustment rods (23); the ends of the electric adjustment rods (23) are fixedly connected with scrapers (22); the scrapers (22) are in sliding contact with the surface of the push rod (5).

5. The electric push rod according to claim 2, characterized in that: Both sides of the maintenance box (3) are fixedly connected with mounting plates, the outer side wall of the mounting plate is fixedly connected with a driving motor (17), the output end of the driving motor (17) is provided with a rotating wheel (18), the rotating wheel (18) is rotatably connected with a swing arm (20), one end of the swing arm (20) away from the rotating wheel (18) is rotatably connected to the outer side wall of the cleaning box (21), a plurality of side boxes (19) are fixedly connected to the outer side wall of the rotating wheel (18), the inner side walls of the plurality of side boxes (19) are slidably connected with a pushing magnet (43), the outer side wall of the pushing magnet (43) is fixedly connected with a pressure spring (44), and one end of the pressure spring (44) away from the pushing magnet (43) is connected to the inner wall of the side box (19).

6. The electric push rod according to claim 3, characterized in that: Both sides of the interior of the positioning ring (25) are slidably connected with a scraping sponge (34); a connecting plate (41) is fixedly connected to the outer wall of the scraping sponge (34); an extrusion rod (31) is fixedly connected to the outer wall of the connecting plate (41); the extrusion rod (31) passes through the outside of the positioning ring (25); a damping spring (46) is sleeved on the extrusion rod (31); an end of the extrusion rod (31) away from the connecting plate (41) is fixedly connected to a side plate (32); a trigger magnet (42) is fixedly connected to the outer wall of the side plate (32); the magnetic pole of the trigger magnet (42) is the same as the magnetic pole of the pushing magnet (43).

7. The electric push rod according to claim 6, characterized in that: A trigger member (35) is fixedly connected to both sides of the scraping sponge (34), a limit track (36) is provided on the trigger member (35), a dripping hole (37) is provided on the limit track (36), a liquid storage chamber (33) is provided above the positioning ring (25), a plurality of slide bars (38) corresponding to the trigger member (35) are slidably connected to the inner wall of the liquid storage chamber (33), a reset spring (39) is sleeved on the outer wall of the slide bar (38), a flow hole (40) is provided inside the reset spring (39), a side of the slide bar (38) close to the liquid storage chamber (33) is sealed, and a liquid adding pipe (30) is provided inside the liquid storage chamber (33), and the liquid adding pipe (30) passes through the outside of the maintenance box (3).

8. The electric linear actuator according to claim 2, characterized in that: The outer shell (1) is provided with a dustproof heat dissipation port (2), and the maintenance box (3) is provided with a flip door (47) which is flipped over, and the flip door (47) is hollowed out.

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