Electric cylinder with lubrication mechanism and use method

Abstract

The present invention belongs to the technical field of electric cylinders, and in particular to an electric cylinder with a lubrication mechanism and a method of using the same. In view of the problem that it is difficult to replenish the grease at the ball screw of the existing electric cylinder, and the dust and fine impurities on the push rod are easily introduced into the cylinder barrel along with the push rod, the following scheme is proposed, which comprises a top cover and a bottom cover, and the top cover and the bottom cover are fixedly connected by a plurality of bolts, and a cavity is formed between the top cover and the bottom cover; a cylinder barrel is fixed on the top of the top cover, a push rod is slidably connected in the cylinder barrel, a front dumpling ear is fixed on the top end of the push rod, and a screw nut is fixed in the push rod. In the present invention, the push rod is driven by the ball screw to make a linear reciprocating movement, so that lubricating oil can be injected between the ball screw and the screw nut, and at the same time, under the action of the third through hole and the U-shaped oil delivery channel, the cylinder barrel, the push rod, the ball screw and the rotating bearing can be intermittently lubricated, thereby improving the stability of operation and reducing the links of manual intervention.

Description

Technical Field

[0001] The present invention relates to the technical field of electric cylinders, and in particular to an electric cylinder with a lubrication mechanism and a use method thereof. Background Art

[0002] The electric cylinder is an electric drive device that converts the rotational motion of the motor into the linear reciprocating motion of the push rod. It is easy to use and has precise positioning. It is widely used in military, electric power, machinery, metallurgy, transportation, mining, petroleum, chemical industry, lifting, transportation, construction and food processing industries.

[0003] Electric cylinders have many advantages, such as reliable performance, sensitive movement, smooth operation, equal push and pull force, and good adaptability to the environment.

[0004] However, the existing electric cylinders have some shortcomings when used:

[0005] Due to the structural limitations of the electric cylinder, the push rod and the front ear are driven by the ball screw and the ball screw nut to make precise reciprocating linear motion. The ball screw is generally lubricated by a one-time pre-filled grease. As the working time increases, it is difficult to replenish the grease, which can easily increase the failure rate of the electric cylinder and reduce its lifespan.

[0006] During use, external dust and fine impurities are easily attached to the outer wall of the push rod. Since the push rod is driven to move back and forth in a straight line, the dust and fine impurities on the push rod are easy to enter the cylinder with the push rod over a long period of time, affecting the smooth reciprocating linear motion of the push rod in the later stage.

[0007] In view of the above problems, the present invention document proposes an electric cylinder with a lubrication mechanism and a method of use. Summary of the invention

[0008] The purpose of the present invention is to solve the shortcomings that it is difficult to replenish grease at the existing ball screw and dust and fine impurities on the push rod can easily enter the cylinder barrel along with the push rod, and to propose an electric cylinder with a lubrication mechanism and a method of use.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] An electric cylinder with a lubrication mechanism comprises a top cover and a bottom cover, wherein the top cover and the bottom cover are fixedly connected by a plurality of bolts, and a cavity is formed between the top cover and the bottom cover;

[0011] A cylinder barrel is fixed on the top of the top cover, a push rod is slidably connected in the cylinder barrel, a front dumpling ear is fixed on the top of the push rod, and a screw nut is fixed in the push rod;

[0012] A ball screw, the ball screw is rotatably connected to the bottom inner wall of the cavity, the top end of the ball screw rotates through the top cover and extends into the screw nut, and the screw nut cooperates with the ball screw;

[0013] The driving structure is arranged on the top of the top cover, and the driving structure includes a planetary gear reduction box and a motor. The motor is connected to the input shaft of the planetary gear reduction box through a coupling, and the output shaft of the planetary gear reduction box drives the ball screw to rotate through the first gear and the second gear and drives the push rod to reciprocate linear motion;

[0014] An oil injection structure is arranged on the top inner wall of the cavity, and the oil injection structure includes a first fixing ring, which is connected to a first through hole in the ball screw; the first fixing ring is connected to a lubricating oil injection bin of a planetary gear reducer through an oil delivery pipe, and is used for intermittent lubricating oil injection operation;

[0015] The impurity removal structure is arranged at the top of the cylinder, and includes a closing cover and an incomplete gasket fixed on the closing cover. The closing cover is passed through the top of the push rod, and an incomplete hollow ring is welded on the inner wall of the incomplete gasket. Multiple air outlets are arranged in the incomplete hollow ring to blow away dust and fine impurities on the outer wall of the push rod.

[0016] In a possible design, the planetary gear reducer is fixed on the top of the top cover, the motor is fixed to one side of the cylinder by bolts, the output shaft of the planetary gear reducer rotates and extends into the cavity and is fixed to the first gear, the outer wall of the ball screw is fixed to the second gear, and the second gear is meshed with the first gear, the bottom inner wall of the cavity is provided with a rotating bearing, and the bottom end of the ball screw passes through the rotating bearing and cooperates with the rotating bearing, a protective cover for protecting the planetary gear reducer and the motor is fixed on the top of the top cover, and one side of the protective cover is fixedly connected to the cylinder; the rotational power generated by the operation of the motor is decelerated by the planetary gear reducer, and then drives the ball screw to rotate through the cooperation of the first gear and the second gear, the ball screw cooperates with the screw nut, and the screw nut drives the push rod and the front dumpling ear to perform reciprocating linear motion.

[0017] In a possible design, the first fixing ring is fixed to the top inner wall of the cavity, and the first fixing ring is rotatably sleeved on the outer wall of the ball screw, there are multiple first through holes in the ball screw, the oil delivery pipe is arranged on one side of the first fixing ring, the bottom of the front dumpling ear is rotatably connected with a hollow piston rod, the bottom end of the hollow piston rod is sealed and slidably extended into the ball screw, a second one-way valve is fixed in the hollow piston rod, a first one-way valve matched with the second one-way valve is fixed in the ball screw, and the first one-way valve is located below the second one-way valve, the first one-way valve is located above the first through hole, and multiple second through holes are arranged in the hollow piston rod; When the lead screw nut drives the push rod to move upward, the push rod drives the hollow piston rod to move upward. At this time, the first one-way valve opens and the second one-way valve is closed. The ball screw is in a negative pressure state at this time. As the hollow piston rod moves upward, the lubricating oil in the lubricating oil injection tank in the planetary gear reduction box can be drawn into the ball screw through the first through hole and the oil pipe. At this time, the lubricating oil is below the second one-way valve. When the push rod and the hollow piston rod move downward, the first one-way valve is closed and the second one-way valve is opened. The lubricating oil in the ball screw moves upward through the second one-way valve into the hollow piston rod, and the lubricating oil is injected between the ball screw and the lead screw nut through the second through hole, thereby achieving uninterrupted lubrication.

[0018] In a possible design, the closing cover is fixed to the top of the cylinder, the incomplete gasket is fixedly connected to the cylinder and the closing cover by a plurality of fastening bolts, the air ejected from the air outlet is used to blow away the dust and fine impurities attached to the outer wall of the push rod, an air pipe is provided on one side of the cylinder, and the bottom end of the air pipe is located below the push rod, the top end of the air pipe extends into the incomplete hollow ring, a second fixing ring is fixed to the outer wall of the air pipe, and the second fixing ring is fixedly connected to the incomplete hollow ring by bolts, a filter is provided near the top end of the air pipe, and the cylinder A plurality of limit guide blocks are fixed on one side, and the limit guide blocks are used to limit the air pipe; when the push rod moves downward, the first sealing ring injects the air inside the cylinder into the incomplete hollow ring, and the air outlet sprays the air to the push rod, which is used to blow away the dust and fine impurities attached to the push rod to ensure the cleanliness of the outer wall of the push rod. In addition, the incomplete hollow ring and the incomplete gasket ring are both provided with openings, and dust and fine impurities are blown to the outside through the openings. In addition, the second fixing ring and the incomplete hollow ring can be disassembled to take out the air pipe, and the filter in the air pipe can be replaced to avoid clogging of the filter.

[0019] In a possible design, a plurality of third through holes are provided in the push rod, and the third through holes cooperate with the lead screw nut; when the push rod moves down to the bottom end, the lubricating oil between the lead screw nut and the ball screw flows into between the push rod and the cylinder barrel through the third through holes, so as to lubricate the push rod and the cylinder barrel.

[0020] In one possible design, a second sealing ring is fixed to the bottom end of the hollow piston rod to increase the sealing between the hollow piston rod and the ball screw, and the bottom of the push rod and the screw nut are fixed with the same first sealing ring to increase the sealing between the push rod and the cylinder.

[0021] In a possible design, an annular oil storage groove is provided on the inner wall of the bottom of the cavity, an oil drain passage connected to the annular oil storage groove is provided in the bottom cover, a sealing plug is threadedly connected to the oil drain passage, and the sealing plug is used to block the oil drain passage; excess lubricating oil can be collected through the annular oil storage groove, and the collected lubricating oil can flow to the outside through the oil drain passage for collection.

[0022] In a possible design, the bottom of the bottom cover is detachably fixed with a rear dumpling ear, the top of the top cover is provided with an annular positioning groove, and the bottom end of the cylinder extends into the annular positioning groove, and a plurality of U-shaped oil passages are provided in the ball screw, and the plurality of U-shaped oil passages are alternately arranged with the plurality of first through holes, and the bottom end of the U-shaped oil passage is located above the rotating bearing; the cylinder can be positioned by the annular positioning groove so that the cylinder can be more stably fixed on the top of the top cover; when the push rod moves down to the lowest point, the lubricating oil between the ball screw and the screw nut is injected into the space between the ball screw and the rotating bearing through the U-shaped oil passage, further lubricating the ball screw and the rotating bearing, and ensuring a good rotation effect between the rotating bearing and the ball screw.

[0023] In a possible design, a sliding rod is sealed and slidably penetrated through the bottom inner wall of the annular oil storage tank, and the bottom end of the sliding rod extends to the bottom of the bottom cover, the outer wall of the sliding rod is sleeved with a spring fixedly connected to the bottom of the bottom cover, and the bottom end of the spring is fixedly connected to the outer wall of the sliding rod, and an oiling cotton layer located in the annular oil storage tank is fixed to the top of the sliding rod, and the oiling cotton layer is located below the meshing position of the first gear and the second gear; by pushing the sliding rod and the oiling cotton layer, the oiling cotton layer can apply lubricating oil to the first gear and the second gear at the same time.

[0024] In the present application, a method for using an electric cylinder with a lubrication mechanism comprises the following steps:

[0025] S1. The rotational power generated by the motor is decelerated by the planetary gear reducer, and then the first gear and the second gear cooperate to drive the ball screw to rotate. The ball screw cooperates with the screw nut, and the screw nut drives the push rod and the front dumpling ear to perform reciprocating linear motion;

[0026] S2. When the screw nut drives the push rod to move upward, the push rod drives the hollow piston rod to move upward. At this time, the first one-way valve is opened and the second one-way valve is closed. The ball screw is in a negative pressure state at this time. As the hollow piston rod moves upward, the lubricating oil in the lubricating oil injection bin in the planetary gear reduction box can be drawn into the ball screw through the first through hole and the oil delivery pipe. At this time, the lubricating oil is below the second one-way valve. When the push rod and the hollow piston rod move downward, the first one-way valve is closed and the second one-way valve is opened. The lubricating oil in the ball screw moves upward through the second one-way valve into the hollow piston rod, and the lubricating oil is injected between the ball screw and the screw nut through the second through hole, thereby achieving uninterrupted lubrication.

[0027] S3, and the lubricating oil between the ball screw and the screw nut is injected into the space between the ball screw and the rotating bearing through the U-shaped oil delivery channel, so as to further lubricate the ball screw and the rotating bearing, and ensure a good rotation effect between the rotating bearing and the ball screw;

[0028] S4. When the push rod moves downward, the first sealing ring injects the air inside the cylinder into the incomplete hollow ring, and the air outlet sprays the air toward the push rod, so as to blow away the dust and fine impurities attached to the push rod, thereby ensuring the cleanliness of the outer wall of the push rod. In addition, both the incomplete hollow ring and the incomplete gasket ring are provided with openings, and the dust and fine impurities are blown to the outside through the openings. In addition, the second fixing ring and the incomplete hollow ring can be disassembled, the air pipe can be taken out, and the filter in the air pipe can be replaced to avoid clogging of the filter.

[0029] S5. Excess lubricating oil can be collected through the annular oil storage tank, and the collected lubricating oil can flow to the outside through the oil discharge channel for collection. By pushing the sliding rod and the oiling cotton layer, the oiling cotton layer can apply lubricating oil to the first gear and the second gear at the same time.

[0030] Beneficial effects:

[0031] In the present invention, the bottom end of the hollow piston rod is sealed and slidably extended into the ball screw, a second one-way valve is fixed in the hollow piston rod, a first one-way valve matched with the second one-way valve is fixed in the ball screw, and a plurality of second through holes are provided in the hollow piston rod; when the hollow piston rod moves upward, the first one-way valve is opened and the second one-way valve is closed, so that the lubricating oil in the cavity can be drawn into the ball screw; when the push rod and the hollow piston rod move downward, the first one-way valve is closed and the second one-way valve is opened, and the lubricating oil in the ball screw moves upward into the hollow piston rod through the second one-way valve, and the lubricating oil is injected between the ball screw and the screw nut through the second through hole, so as to play an uninterrupted lubrication role;

[0032] In the present invention, a plurality of U-shaped oil delivery channels are provided in the ball screw, the bottom end of the U-shaped oil delivery channels is located above the rotating bearing, a plurality of third through holes are provided in the push rod, and the third through holes are matched with the screw nut; when the push rod moves down to the bottom end, the lubricating oil between the screw nut and the ball screw flows into the space between the push rod and the cylinder barrel through the third through holes, and is used to lubricate the push rod and the cylinder barrel, and the lubricating oil is also injected into the space between the ball screw and the rotating bearing through the U-shaped oil delivery channel, and the ball screw and the rotating bearing are further lubricated, so as to ensure a good rotation effect between the rotating bearing and the ball screw;

[0033] In the present invention, an incomplete gasket is fixed on the top of the closure cover, an incomplete hollow ring is welded on the inner wall of the incomplete gasket, a plurality of air outlets are arranged on the inner wall of the incomplete hollow ring, an air pipe is arranged on one side of the cylinder, and the top end of the air pipe extends into the incomplete hollow ring; when the push rod moves downward, the first sealing ring injects the air inside the cylinder into the incomplete hollow ring, and the air outlet sprays the air toward the push rod, so as to blow away the dust and fine impurities attached to the push rod, thereby ensuring the cleanliness of the outer wall of the push rod; in addition, both the incomplete hollow ring and the incomplete gasket are provided with openings, and the dust and fine impurities are blown to the outside through the openings;

[0034] In the present invention, a sliding rod is sealingly and slidingly penetrated through the bottom inner wall of the annular oil storage groove, and the bottom end of the sliding rod extends to the bottom of the bottom cover, the outer wall of the sliding rod is sleeved with a spring fixedly connected to the bottom of the bottom cover, and the bottom end of the spring is fixedly connected to the outer wall of the sliding rod, and an oiling cotton layer located in the annular oil storage groove is fixed to the top of the sliding rod, and the oiling cotton layer is located below the meshing position of the first gear and the second gear; by pushing the sliding rod and the oiling cotton layer, the oiling cotton layer can apply lubricating oil to the first gear and the second gear at the same time.

[0035] In the present invention, the push rod is driven to make linear reciprocating movement by the ball screw, and the lubricating oil can be injected between the ball screw and the screw nut with the cooperation of the first one-way valve and the second one-way valve, thereby achieving uninterrupted lubrication. At the same time, under the action of the third through hole and the U-shaped oil delivery channel, intermittent lubrication can be performed on the cylinder, the push rod, the ball screw, and the rotating bearing, thereby improving the stability of operation and reducing the links of manual intervention. In addition, when the push rod moves up and down, the dust and fine impurities attached to the push rod can be blown away, thereby ensuring the cleanliness of the outer wall of the push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the three-dimensional structure of an electric cylinder with a lubrication mechanism provided in Example 1 of the present invention;

[0037] Figure 2 A schematic diagram of a three-dimensional exploded structure of an electric cylinder with a lubrication mechanism provided in Example 1 of the present invention;

[0038] Figure 3 A schematic diagram of a three-dimensional cross-sectional structure of an electric cylinder with a lubrication mechanism provided in Example 1 of the present invention;

[0039] Figure 4 A schematic diagram of a three-dimensional cross-sectional structure of a top cover, a bottom cover and a protective cover of an electric cylinder with a lubrication mechanism provided in Example 1 of the present invention;

[0040] Figure 5 A schematic diagram of a partial three-dimensional cross-sectional structure of a ball screw and a first fixing ring of an electric cylinder with a lubrication mechanism provided in Example 1 of the present invention;

[0041] Figure 6 A schematic diagram of a three-dimensional cross-sectional structure of a cylinder barrel and a push rod of an electric cylinder with a lubrication mechanism provided in Example 1 of the present invention;

[0042] Figure 7 A schematic three-dimensional cross-sectional structure diagram of a ball screw and a first fixing ring of an electric cylinder with a lubrication mechanism provided in Example 1 of the present invention;

[0043] Figure 8 A schematic diagram of the three-dimensional structure of an incomplete hollow ring, an air pipe and an incomplete gasket ring of an electric cylinder with a lubrication mechanism provided in Example 1 of the present invention;

[0044] Fig. 9 This is a schematic diagram of the front and cross-sectional structure of a top cover and a bottom cover of an electric cylinder with a lubrication mechanism provided in Example 2 of the present invention.

[0045] In the figure: 1, top cover; 2, bottom cover; 3, cavity; 4, first gear; 5, ball screw; 6, second gear; 7, rotating bearing; 8, planetary gear reduction box; 9, motor; 10, protective cover; 11, cylinder; 12, push rod; 13, screw nut; 14, hollow piston rod; 15, front dumpling ear; 16, closing cover; 17, first fixing ring; 18, first through hole; 19, oil pipeline; 20, first one-way valve; 21, second one-way valve; 22 , second through hole; 23, third through hole; 24, U-shaped oil delivery channel; 25, incomplete gasket; 26, fastening bolt; 27, incomplete hollow ring; 28, air outlet; 29, air pipe; 30, limiting guide block; 31, second fixing ring; 32, first sealing ring; 33, second sealing ring; 34, annular oil storage tank; 35, oil drain channel; 36, sealing plug; 37, rear dumpling ear; 38, annular positioning groove; 39, sliding rod; 40, oiling cotton layer; 41, spring. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0047] Example 1

[0048] Reference Figure 1-Figure 8 , an electric cylinder with a lubrication mechanism, which is used in the field of electric cylinders, comprises a top cover 1 and a bottom cover 2, wherein the top cover 1 and the bottom cover 2 are fixedly connected by a plurality of bolts, and a cavity 3 is formed between the top cover 1 and the bottom cover 2;

[0049] The cylinder barrel 11 is fixed on the top of the top cover 1, and a push rod 12 is slidably connected in the cylinder barrel 11. A front dumpling ear 15 is fixed on the top of the push rod 12, and a screw nut 13 is fixed in the push rod 12;

[0050] The ball screw 5 is rotatably connected to the bottom inner wall of the cavity 3 , and the top end of the ball screw 5 rotates through the top cover 1 and extends into the screw nut 13 , and the screw nut 13 cooperates with the ball screw 5 .

[0051] Reference Figure 2 and Figure 4 An annular oil storage groove 34 is provided on the inner wall of the bottom of the cavity 3, and an oil discharge passage 35 connected to the annular oil storage groove 34 is provided in the bottom cover 2. A sealing plug 36 is threadedly connected to the oil discharge passage 35, and the sealing plug 36 is used to block the oil discharge passage 35; excess lubricating oil can be collected through the annular oil storage groove 34, and the collected lubricating oil can flow to the outside through the oil discharge passage 35 for collection.

[0052] Reference Figure 2-Figure 4 The electric cylinder also includes a driving structure arranged on the top of the cover 1, which is used to drive the ball screw 5 to rotate and drive the push rod 12 to reciprocate linearly; the driving structure includes a planetary gear reduction box 8 fixed to the top of the top cover 1, a motor 9 is fixed to one side of the cylinder barrel 11 by bolts, and the output shaft of the motor 9 is fixedly connected to the input shaft of the planetary gear reduction box 8 through a coupling, the output shaft of the planetary gear reduction box 8 rotates and extends into the cavity 3 and is fixed with a first gear 4, the outer wall of the ball screw 5 is fixed with a second gear 6, and the second gear 6 is meshed with the first gear 4, and the cavity 3 A rotating bearing 7 is provided on the inner wall of the bottom, and the bottom end of the ball screw 5 passes through the rotating bearing 7 and cooperates with the rotating bearing 7. A protective cover 10 for protecting the planetary gear reduction box 8 and the motor 9 is fixed on the top of the top cover 1, and one side of the protective cover 10 is fixedly connected to the cylinder 11; the rotational power generated by the operation of the motor 9 is decelerated by the planetary gear reduction box 8, and then driven to rotate by the cooperation of the first gear 4 and the second gear 6, and the ball screw 5 cooperates with the screw nut 13, and the screw nut 13 drives the push rod 12 and the front dumpling ear 15 to perform reciprocating linear motion.

[0053] Reference Figure 3-Figure 7The electric cylinder also includes an oil injection structure arranged on the inner wall of the top of the cavity 3, which is used for intermittent lubricating oil injection operation; the oil injection structure includes a first fixed ring 17 fixed to the inner wall of the top of the cavity 3, and the first fixed ring 17 is rotatably sleeved on the outer wall of the ball screw 5, a plurality of first through holes 18 are provided in the ball screw 5, and the ball screw 5 is connected to the first fixed ring 17 through the first through holes 18, an oil delivery pipe 19 is provided on one side of the first fixed ring 17, and the oil delivery pipe 19 is connected to the lubricating oil injection bin in the planetary gear reduction box 8, the bottom of the front dumpling ear 15 is rotatably connected with a hollow piston rod 14, the bottom end of the hollow piston rod 14 is sealed and slidably extended into the ball screw 5, a second one-way valve 21 is fixed in the hollow piston rod 14, a first one-way valve 20 matched with the second one-way valve 21 is fixed in the ball screw 5, and the first one-way valve 20 is located below the second one-way valve 21, and the first one-way valve 20 is located below the second one-way valve 21. The one-way valve 20 is located above the first through hole 18, and a plurality of second through holes 22 are provided in the hollow piston rod 14; when the screw nut 13 drives the push rod 12 to move upward, the push rod 12 drives the hollow piston rod 14 to move upward, at this time, the first one-way valve 20 is opened, and the second one-way valve 21 is closed, and the ball screw 5 is in a negative pressure state at this time. As the hollow piston rod 14 moves upward, the lubricating oil in the lubricating oil injection warehouse in the planetary gear reduction box 8 can be drawn into the ball screw 5 through the first through hole 18 and the oil delivery pipe 19. At this time, the lubricating oil is below the second one-way valve 21, and when the push rod 12 and the hollow piston rod 14 move downward, the first one-way valve 20 is closed, and the second one-way valve 21 is opened, and the lubricating oil in the ball screw 5 moves upward into the hollow piston rod 14 through the second one-way valve 21, and the lubricating oil is injected between the ball screw 5 and the screw nut 13 through the second through hole 22, thereby playing an uninterrupted lubrication role.

[0054] Reference Figure 6 , a plurality of third through holes 23 are provided in the push rod 12, and the third through holes 23 cooperate with the screw nut 13; when the push rod 12 moves down to the bottom end, the lubricating oil between the screw nut 13 and the ball screw 5 flows into between the push rod 12 and the cylinder barrel 11 through the third through holes 23, so as to lubricate the push rod 12 and the cylinder barrel 11.

[0055] Reference Figure 6 A second sealing ring 33 is fixed to the bottom end of the hollow piston rod 14 to increase the sealing between the hollow piston rod 14 and the ball screw 5. The bottom of the push rod 12 and the screw nut 13 are fixed with the same first sealing ring 32 to increase the sealing between the push rod 12 and the cylinder 11.

[0056] Reference Figure 2 and Figure 7The bottom of the bottom cover 2 is detachably fixed with a rear dumpling ear 37, the top of the top cover 1 is provided with an annular positioning groove 38, and the bottom end of the cylinder 11 extends into the annular positioning groove 38, and a plurality of U-shaped oil delivery passages 24 are provided in the ball screw 5, and the plurality of U-shaped oil delivery passages 24 are arranged alternately with the plurality of first through holes 18, and the bottom end of the U-shaped oil delivery passage 24 is located above the rotating bearing 7; the cylinder 11 can be positioned through the annular positioning groove 38, so that the cylinder 11 can be more stably fixed on the top of the top cover 1; when the push rod 12 moves down to the lowest point, the lubricating oil between the ball screw 5 and the screw nut 13 is injected into the space between the ball screw 5 and the rotating bearing 7 through the U-shaped oil delivery passage 24, and the ball screw 5 and the rotating bearing 7 are further lubricated, so as to ensure that the rotation effect between the rotating bearing 7 and the ball screw 5 is good.

[0057] Reference Figure 3 , Figure 6 and Figure 8 The electric cylinder also includes a debris removal structure arranged at the top of the cylinder barrel 11, which is used to remove dust and fine impurities attached to the outer wall of the push rod 12; the debris removal structure includes a closing cover 16 fixed to the top of the cylinder barrel 11, the top of the push rod 12 slides through the closing cover 16, an incomplete gasket 25 is fixed to the top of the closing cover 16, the incomplete gasket 25 is fixedly connected to the cylinder barrel 11 and the closing cover 16 by a plurality of fastening bolts 26, an incomplete hollow ring 27 is welded to the inner wall of the incomplete gasket 25, and a plurality of air outlets 28 are provided on the inner wall of the incomplete hollow ring 27, and the air ejected from the air outlet 28 is used to blow away the dust and fine impurities attached to the outer wall of the push rod 12, an air pipe 29 is provided on one side of the cylinder barrel 11, and the bottom end of the air pipe 29 is located below the push rod 12, the top end of the air pipe 29 extends into the incomplete hollow ring 27, and the outer wall of the air pipe 29 A second fixing ring 31 is fixed, and the second fixing ring 31 is fixedly connected to the incomplete hollow ring 27 by bolts. A filter is provided near the top of the air pipe 29. A plurality of limiting guide blocks 30 are fixed on one side of the cylinder 11, and the limiting guide blocks 30 are used to limit the air pipe 29. When the push rod 12 moves downward, the first sealing ring 32 injects the air inside the cylinder 11 into the incomplete hollow ring 27, and the air outlet 28 sprays air to the push rod 12, which is used to blow away the dust and fine impurities attached to the push rod 12 to ensure the cleanliness of the outer wall of the push rod 12. In addition, the incomplete hollow ring 27 and the incomplete gasket ring 25 are both provided with openings, and dust and fine impurities are blown to the outside along the openings. In addition, the second fixing ring 31 and the incomplete hollow ring 27 can be disassembled, the air pipe 29 can be taken out, and the filter in the air pipe 29 can be replaced to avoid clogging of the filter.

[0058] Example 2

[0059] refer to Fig. 9, an improvement on the basis of Example 1: a sliding rod 39 is sealingly and slidingly penetrated through the bottom inner wall of the annular oil storage groove 34, and the bottom end of the sliding rod 39 extends to the bottom of the bottom cover 2, and the outer wall of the sliding rod 39 is sleeved with a spring 41 fixedly connected to the bottom of the bottom cover 2, and the bottom end of the spring 41 is fixedly connected to the outer wall of the sliding rod 39, and an oiling cotton layer 40 located in the annular oil storage groove 34 is fixed to the top of the sliding rod 39, and the oiling cotton layer 40 is located below the meshing position of the first gear 4 and the second gear 6; by pushing the sliding rod 39 and the oiling cotton layer 40, the oiling cotton layer 40 can apply lubricating oil to the first gear 4 and the second gear 6 at the same time.

[0060] A method for using an electric cylinder with a lubrication mechanism comprises the following steps:

[0061] The rotational power generated by the operation of S1, the motor 9 is decelerated by the planetary gear reducer 8, and then the first gear 4 and the second gear 6 cooperate to drive the ball screw 5 to rotate, the ball screw 5 cooperates with the screw nut 13, and the screw nut 13 drives the push rod 12 and the front dumpling ear 15 to perform reciprocating linear motion;

[0062] S2. When the screw nut 13 drives the push rod 12 to move upward, the push rod 12 drives the hollow piston rod 14 to move upward. At this time, the first one-way valve 20 is opened and the second one-way valve 21 is closed. The ball screw 5 is in a negative pressure state at this time. As the hollow piston rod 14 moves upward, the lubricating oil in the lubricating oil injection bin in the planetary gear reduction box 8 can be drawn into the ball screw 5 through the first through hole 18 and the oil delivery pipe 19. At this time, the lubricating oil is below the second one-way valve 21. When the push rod 12 and the hollow piston rod 14 move downward, the first one-way valve 20 is closed and the second one-way valve 21 is opened. The lubricating oil in the ball screw 5 moves upward through the second one-way valve 21 into the hollow piston rod 14, and the lubricating oil is injected between the ball screw 5 and the screw nut 13 through the second through hole 22, thereby achieving uninterrupted lubrication.

[0063] S3, and the lubricating oil between the ball screw 5 and the screw nut 13 is injected into the space between the ball screw 5 and the rotating bearing 7 through the U-shaped oil delivery channel 24, so as to further lubricate the ball screw 5 and the rotating bearing 7, thereby ensuring a good rotation effect between the rotating bearing 7 and the ball screw 5;

[0064] S4. When the push rod 12 moves downward, the first sealing ring 32 injects the air inside the cylinder 11 into the incomplete hollow ring 27, and the air outlet 28 sprays the air toward the push rod 12, so as to blow away the dust and fine impurities attached to the push rod 12, thereby ensuring the cleanliness of the outer wall of the push rod 12. In addition, both the incomplete hollow ring 27 and the incomplete gasket ring 25 are provided with openings, and the dust and fine impurities are blown to the outside through the openings. In addition, the second fixing ring 31 and the incomplete hollow ring 27 can be disassembled, and the air pipe 29 can be taken out, so that the filter in the air pipe 29 can be replaced to avoid clogging of the filter.

[0065] S5. Excess lubricating oil can be collected through the annular oil storage groove 34, and the collected lubricating oil can flow to the outside through the oil discharge channel 35 for collection. By pushing the sliding rod 39 and the oiling cotton layer 40, the oiling cotton layer 40 can apply lubricating oil to the first gear 4 and the second gear 6 at the same time.

[0066] However, as is well known to those skilled in the art, the working principle and wiring method of the motor 9 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make any selections according to their needs or convenience.

[0067] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electric cylinder with a lubrication mechanism, characterized in that: It comprises a top cover (1) and a bottom cover (2), wherein the top cover (1) and the bottom cover (2) are fixedly connected by a plurality of bolts, and a cavity (3) is formed between the top cover (1) and the bottom cover (2); A cylinder barrel (11) is fixed on the top of the top cover (1), a push rod (12) is slidably connected inside the cylinder barrel (11), a front dumpling ear (15) is fixed on the top end of the push rod (12), and a screw nut (13) is fixed inside the push rod (12); A ball screw (5), the ball screw (5) being rotatably connected to the bottom inner wall of the cavity (3), the top end of the ball screw (5) being rotatably passed through the top cover (1) and extending into the screw nut (13), and the screw nut (13) being matched with the ball screw (5); A drive structure is arranged on the top of the top cover (1), the drive structure comprising a planetary gear reduction box (8) and a motor (9), the motor (9) being connected to an input shaft of the planetary gear reduction box (8) via a coupling, and the output shaft of the planetary gear reduction box (8) drives the ball screw (5) to rotate via a first gear (4) and a second gear (6) and drives the push rod (12) to reciprocate linearly; An oil injection structure is arranged on the top inner wall of the cavity (3), the oil injection structure comprising a first fixing ring (17), the first fixing ring (17) being in communication with a first through hole (18) in the ball screw (5); the first fixing ring (17) is connected to a lubricating oil injection chamber of a planetary gear reduction box (8) via an oil delivery pipe (19), and is used for intermittently performing a lubricating oil injection operation; The impurity removal structure is arranged at the top of the cylinder (11), and comprises a closing cover (16) and an incomplete gasket (25) fixed on the closing cover (16). The closing cover (16) is passed through the top of the push rod (12). An incomplete hollow ring (27) is welded on the inner wall of the incomplete gasket (25). The incomplete hollow ring (27) is provided with a plurality of air outlets (28) for blowing away dust and fine impurities on the outer wall of the push rod (12).

2. The electric cylinder with a lubrication mechanism according to claim 1, characterized in that: A planetary gear reduction box (8) is fixed on the top of the top cover (1), and the motor (9) is fixed to one side of the cylinder (11) by bolts. The output shaft of the planetary gear reduction box (8) rotates and extends into the cavity (3) and is fixed to the first gear (4). The outer wall of the ball screw (5) is fixed to the second gear (6), and the second gear (6) is meshed with the first gear (4). A rotating bearing (7) is provided on the inner wall of the bottom of the cavity (3), and the bottom end of the ball screw (5) passes through the rotating bearing (7) and cooperates with the rotating bearing (7). A protective cover (10) for protecting the planetary gear reduction box (8) and the motor (9) is fixed to the top of the top cover (1), and one side of the protective cover (10) is fixedly connected to the cylinder (11).

3. The electric cylinder with a lubrication mechanism according to claim 2, characterized in that: A first fixing ring (17) is fixed to the top inner wall of the cavity (3), and the first fixing ring (17) is rotatably sleeved on the outer wall of the ball screw (5). The ball screw (5) has a plurality of first through holes (18). An oil delivery pipe (19) is arranged on one side of the first fixing ring (17). The bottom of the front dumpling ear (15) is rotatably connected to a hollow piston rod (14). The bottom end of the hollow piston rod (14) extends into the ball screw (5) in a sealing and sliding manner. A second one-way valve (21) is fixed in the hollow piston rod (14). A first one-way valve (20) matched with the second one-way valve (21) is fixed in the ball screw (5), and the first one-way valve (20) is located below the second one-way valve (21). The first one-way valve (20) is located above the first through hole (18). The hollow piston rod (14) is provided with a plurality of second through holes (22).

4. The electric cylinder with a lubrication mechanism according to claim 3, characterized in that: The closing cover (16) is fixed to the top of the cylinder (11); the incomplete gasket (25) is fixedly connected to the cylinder (11) and the closing cover (16) by a plurality of fastening bolts (26); the air ejected from the air outlet (28) is used to blow away dust and fine impurities attached to the outer wall of the push rod (12); an air pipe (29) is provided on one side of the cylinder (11); the bottom end of the air pipe (29) is located below the push rod (12); the top end of the air pipe (29) extends into the incomplete hollow ring (27); a second fixing ring (31) is fixed to the outer wall of the air pipe (29); the second fixing ring (31) is fixedly connected to the incomplete hollow ring (27) by bolts; a filter is provided near the top of the air pipe (29); a plurality of limiting guide blocks (30) are fixed on one side of the cylinder (11); and the limiting guide blocks (30) are used to limit the air pipe (29).

5. The electric cylinder with a lubrication mechanism according to claim 4, characterized in that: A plurality of third through holes (23) are provided in the push rod (12), and the third through holes (23) match the screw rod nut (13).

6. The electric cylinder with a lubrication mechanism according to claim 5, characterized in that: A second sealing ring (33) is fixed to the bottom end of the hollow piston rod (14) for increasing the sealing performance between the hollow piston rod (14) and the ball screw (5); and a first sealing ring (32) is fixed to the bottom of the push rod (12) and the screw nut (13) for increasing the sealing performance between the push rod (12) and the cylinder barrel (11).

7. The electric cylinder with a lubrication mechanism according to claim 6, characterized in that: An annular oil storage groove (34) is provided on the inner wall of the bottom of the cavity (3), an oil discharge passage (35) connected to the annular oil storage groove (34) is provided in the bottom cover (2), a sealing plug (36) is connected to the inner thread of the oil discharge passage (35), and the sealing plug (36) is used to block the oil discharge passage (35).

8. The electric cylinder with a lubrication mechanism according to claim 7, characterized in that: The bottom of the bottom cover (2) is detachably fixed with a rear dumpling ear (37), the top of the top cover (1) is provided with an annular positioning groove (38), and the bottom end of the cylinder barrel (11) extends into the annular positioning groove (38), a plurality of U-shaped oil delivery passages (24) are provided in the ball screw (5), and the plurality of U-shaped oil delivery passages (24) and the plurality of first through holes (18) are arranged in an alternating manner, and the bottom end of the U-shaped oil delivery passage (24) is located above the rotating bearing (7).

9. The electric cylinder with a lubrication mechanism according to claim 8, characterized in that: A sliding rod (39) is sealingly and slidably penetrated through the inner wall of the bottom of the annular oil storage groove (34), and the bottom end of the sliding rod (39) extends to the bottom of the bottom cover (2). The outer wall of the sliding rod (39) is sleeved with a spring (41) fixedly connected to the bottom of the bottom cover (2), and the bottom end of the spring (41) is fixedly connected to the outer wall of the sliding rod (39). An oiling cotton layer (40) located in the annular oil storage groove (34) is fixed to the top of the sliding rod (39), and the oiling cotton layer (40) is located below the meshing position of the first gear (4) and the second gear (6).

10. The method for using the electric cylinder with a lubrication mechanism according to claim 9, characterized in that: The following steps are involved: The rotational power generated by the operation of the S1 motor (9) is decelerated by the planetary gear reducer (8), and then driven by the cooperation of the first gear (4) and the second gear (6) to rotate the ball screw (5), the ball screw (5) cooperates with the screw nut (13), and the screw nut (13) drives the push rod (12) and the front dumpling ear (15) to perform reciprocating linear motion; S2. When the screw nut (13) drives the push rod (12) to move upward, the push rod (12) drives the hollow piston rod (14) to move upward. At this time, the first one-way valve (20) is opened, and the second one-way valve (21) is closed. The ball screw (5) is in a negative pressure state. As the hollow piston rod (14) moves upward, the lubricating oil in the lubricating oil injection tank in the planetary gear reduction box (8) can be pumped into the ball screw (5) through the first through hole (18) and the oil delivery pipe (19). At this time, the lubricating oil is below the second one-way valve (21). When the push rod (12) and the hollow piston rod (14) move downward, the first one-way valve (20) is closed and the second one-way valve (21) is opened. The lubricating oil in the ball screw (5) moves upward through the second one-way valve (21) into the hollow piston rod (14), and is injected between the ball screw (5) and the screw nut (13) through the second through hole (22), thereby achieving an uninterrupted lubrication effect. S3, the lubricating oil between the ball screw (5) and the screw nut (13) is injected into the space between the ball screw (5) and the rotating bearing (7) through the U-shaped oil delivery passage (24), thereby further lubricating the ball screw (5) and the rotating bearing (7); S4. When the push rod (12) moves downward, the first sealing ring (32) injects air inside the cylinder (11) into the incomplete hollow ring (27), and the air outlet (28) sprays air toward the push rod (12), so as to blow away dust and fine impurities attached to the push rod (12) and ensure the cleanliness of the outer wall of the push rod (12). In addition, the incomplete hollow ring (27) and the incomplete gasket ring (25) are both provided with openings, and dust and fine impurities are blown to the outside through the openings. In addition, the second fixing ring (31) and the incomplete hollow ring (27) can be disassembled, the air pipe (29) can be taken out, and the filter in the air pipe (29) can be replaced; S5. Excess lubricating oil can be collected through the annular oil storage groove (34), and the collected lubricating oil can flow to the outside through the oil discharge channel (35) for collection. By pushing the sliding rod (39) and the oiling cotton layer (40), the oiling cotton layer (40) can simultaneously apply lubricating oil to the first gear (4) and the second gear (6).

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