CN113898706A

CN113898706A - Electric cylinder and engineering machinery

Info

Publication number: CN113898706A
Application number: CN202111216077.9A
Authority: CN
Inventors: 姜仁坤; 关闯; 吴建中
Original assignee: Sany Heavy Equipment Co Ltd
Current assignee: Sany Heavy Equipment Co Ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-01-07

Abstract

An embodiment of the present invention provides an electric cylinder and an engineering machine, wherein the electric cylinder includes: a cylinder barrel; the screw rod is rotatably arranged in the cylinder barrel in a penetrating way; the screw nut is arranged in the cylinder barrel and is in threaded connection with the screw rod; the guide sleeve is fixedly connected with the cylinder barrel; the push rod is connected with the nut and penetrates through the guide sleeve; the first sealing assembly is arranged between the guide sleeve and the push rod; and the second sealing assembly is arranged between the guide sleeve and the cylinder barrel. According to the technical scheme, the sealing performance between the guide sleeve and the cylinder barrel and between the guide sleeve and the push rod can be improved by arranging the sealing assembly, so that impurities such as external rainwater or dust are effectively prevented from entering the electric cylinder to corrode important parts such as a lead screw or a gear, and the reliability and the service life of the electric cylinder are improved. In addition, after the electric cylinder reaches the designated position, when the motor does not work any more, the screw rod and the screw nut can be in a self-locking state and keep relatively static, and the safety performance is improved.

Description

Electric cylinder and engineering machinery

Technical Field

The embodiment of the invention relates to the technical field of engineering machinery, in particular to an electric cylinder and engineering machinery.

Background

With the continuous development of the automation process of engineering machinery, the electric cylinder gradually replaces a hydraulic cylinder in the aspect of linear displacement driving, adopts lead screw transmission, is powered by a motor, runs stably, does not need to be externally provided with a hydraulic oil source, and has been widely applied to the fields of weaponry and industry.

There are various complicated operating modes in the engineering application, for example, high wind and rain etc. and ordinary electronic jar is hardly dealt with complicated operating mode, if inside rainwater or impurity entered into electronic jar, probably caused important spare part corruption or out of control influence electronic jar reliability and life-span, can harm operating personnel's personal safety even.

Disclosure of Invention

In order to solve or improve at least one of the above technical problems, an object of an embodiment of the present invention is to provide an electric cylinder.

Another object of an embodiment of the present invention is to provide a construction machine having the above electric cylinder.

To achieve the above object, an embodiment of a first aspect of the present invention provides an electric cylinder including: a cylinder barrel; the lead screw penetrates through the cylinder barrel and can rotate relative to the cylinder barrel; the screw nut is arranged in the cylinder barrel and is in threaded connection with the lead screw; the guide sleeve is connected with the cylinder barrel and is relatively fixed with the cylinder barrel; the push rod is connected with the nut and penetrates through the guide sleeve; the first sealing assembly is arranged between the guide sleeve and the push rod; and the second sealing assembly is arranged between the guide sleeve and the cylinder barrel.

According to the embodiment of the electric cylinder provided by the invention, the sealing performance between the guide sleeve and the cylinder barrel and between the guide sleeve and the push rod can be improved by arranging the sealing assembly, so that impurities such as external rainwater or dust are effectively prevented from entering the electric cylinder, important parts such as a lead screw or a gear are corroded, and the reliability and the service life of the electric cylinder are improved. In addition, after the electric cylinder reaches the designated position, when the motor does not work any more, the screw rod and the screw nut can be in a self-locking state and keep relatively static, so that the safety performance is improved, and the possibility of injuring operators under the condition of temporary power failure is greatly reduced.

Specifically, the electric cylinder includes a cylinder tube, a lead screw, a nut, a guide sleeve, a push rod, a first seal assembly, and a second seal assembly. Wherein, the cylinder is worn to locate by the lead screw, and the axis of lead screw and the axis coincidence of cylinder, the lead screw can rotate relative to the cylinder. The nut is arranged in the cylinder barrel and is in threaded connection with the lead screw, and the friction force between the threaded contact surfaces of the nut and the lead screw can meet the requirement of relative rest between the lead screw and the nut. In other words, after the electric cylinder reaches the designated position, when the motor does not work any more, the screw rod and the nut are in a self-locking state, namely the screw rod and the nut can be kept static at the moment.

Further, the guide sleeve is connected with the cylinder barrel. Specifically, the guide sleeve is connected with a port at one end of the cylinder barrel, and the guide sleeve and the cylinder barrel are relatively fixed. The guide sleeve can be fixedly connected with the cylinder barrel in a welding mode; alternatively, the guide sleeve is detachably connected with the cylinder barrel through bolts or other methods. Further, the push rod is connected with the screw nut, and the push rod penetrates through the guide sleeve. By arranging the guide sleeve, on one hand, the guide sleeve can play a role in guiding the push rod, and the end part of the push rod can be ensured to smoothly extend out of or retract into the cylinder barrel; on the other hand, the sealing function can be achieved to a certain extent, dust or other impurities are prevented from entering, and the service life of the electric dynamic effect is prolonged.

Further, first seal assembly is located between uide bushing and the push rod, through setting up first seal assembly, can improve the leakproofness between uide bushing and the push rod. The second seal assembly is arranged between the guide sleeve and the cylinder barrel, and the tightness between the guide sleeve and the cylinder barrel can be improved by arranging the second seal assembly.

In the technical scheme defined by the invention, the sealing performance between the guide sleeve and the cylinder barrel and between the guide sleeve and the push rod can be improved by arranging the sealing assembly, so that impurities such as external rainwater or dust are effectively prevented from entering the interior of the electric cylinder and corroding important parts such as a lead screw or a gear, and the reliability and the service life of the electric cylinder are favorably improved. In addition, after the electric cylinder reaches the designated position, when the motor does not work any more, the screw rod and the screw nut can be in a self-locking state and keep relatively static, so that the safety performance is improved, and the possibility of injuring operators under the condition of temporary power failure is greatly reduced.

In addition, the technical scheme provided by the invention can also have the following additional technical characteristics:

in above-mentioned technical scheme, one side that the uide bushing is close to the push rod is equipped with first standing groove and second standing groove, and first standing groove is located one side that the second standing groove deviates from the screw, and first seal assembly includes: the dustproof ring is arranged in the first placing groove and is abutted against the push rod; the first sealing element is arranged on the second placing groove and abuts against the push rod.

In this solution, the first seal assembly comprises a wiper and a first seal. Specifically, one side that the uide bushing is close to the push rod is equipped with first standing groove, and the dust ring is located in the first standing groove, and the dust ring offsets with the push rod. By arranging the dustproof ring, on one hand, the dustproof ring can play a role in sealing and dust prevention; on the other hand, in the working process, the push rod continuously extends out or retracts, and the dust ring can scrape attachments on the surface of the push rod, so that the cleaning effect is achieved to a certain extent.

Furthermore, a second placing groove is further formed in one side, close to the push rod, of the guide sleeve, the first sealing element is arranged in the second placing groove, and the first sealing element abuts against the push rod. Through setting up first sealing member, can improve the leakproofness between uide bushing and the push rod, prevent that rainwater etc. from entering into to corrode important spare part in the cylinder.

Further, the first placing groove is located on the side, away from the nut, of the second placing groove. It will be appreciated that the wiper and the first seal act as a two-layer sealing barrier between the cylinder and the push rod, with the wiper being on the outside (i.e. away from the trapezoidal nut) and the first seal being on the inside (i.e. close to the trapezoidal nut).

It is noted that the first seal may be an O-ring or other structure for sealing.

In above-mentioned technical scheme, one side that the uide bushing is close to the cylinder is equipped with the third standing groove, and second seal assembly includes: and the second sealing piece is arranged on the third placing groove and is abutted against the cylinder barrel.

In this aspect, the second seal assembly includes a second seal. Specifically, one side that the uide bushing is close to the cylinder is equipped with the third standing groove, and the second sealing member is located in the third standing groove, and the second sealing member offsets with the cylinder. Through setting up the second sealing member, can improve the leakproofness between uide bushing and the cylinder, prevent that rainwater etc. from entering into to corrode important spare part in the cylinder.

It is noted that the second seal may be an O-ring or other structure for sealing.

In above-mentioned technical scheme, one side that the uide bushing is close to the push rod still is equipped with oil storage tank and fourth standing groove, and oil storage tank and fourth standing groove all are located one side that the second standing groove is close to the screw, and the oil storage tank is located between second standing groove and the fourth standing groove, and electronic jar still includes: the first guide piece is arranged on the fourth placing groove and abuts against the push rod.

In this technical scheme, through set up the oil storage tank in the uide bushing one side that is close to the push rod, the oil storage tank can be stored lubricating grease when the assembly to the cylinder body is inside to be filled with oil gas when guaranteeing electronic jar action, effectively prevents to take place dry friction between push rod and uide bushing or the cylinder. Further, the oil storage tank is located the second standing groove and is close to one side of screw, and the oil storage tank is in the inboard of electronic jar promptly, greatly reduced the lubricating grease in the oil storage tank by the possibility of impurity pollution such as rainwater or dust.

Further, the electric cylinder further includes a first guide. Specifically, a fourth placing groove is further formed in one side, close to the push rod, of the guide sleeve. The fourth standing groove is located the second standing groove and is close to one side of screw, and the oil storage tank is located between second standing groove and the fourth standing groove. The first guide piece is arranged in the fourth placing groove and is abutted to the push rod. The first guide piece is made of self-lubricating materials, and on one hand, the first guide piece can play a role in guiding and supporting; on the other hand, the sealing function can be achieved, namely the sealing performance between the guide sleeve and the push rod is improved; moreover, the lubricating device can also play a role in auxiliary lubrication, and can be used for paving the lubricating grease coated on the surface of the push rod, so that dry friction between the push rod and the guide sleeve is effectively avoided.

It is noted that the first guide member may be a guide ring or other structure.

In the above technical solution, the method further comprises: the piston is arranged in the cylinder barrel and is connected with the nut, the outer wall of the piston abuts against the inner wall of the cylinder barrel, and a fifth placing groove is formed in the outer wall of the piston; and the second guide piece is arranged on the fifth placing groove and is abutted to the inner wall of the cylinder barrel.

In this technical solution, the electric cylinder further includes a piston and a second guide. Specifically, the piston is arranged in the cylinder barrel, the piston is connected with the screw nut, and the outer wall of the piston is abutted to the inner wall of the cylinder barrel. In the process of the rotation of the screw rod, the screw can drive the piston and the push rod to move, so that the rotary motion is converted into linear motion.

Further, the outer wall of the piston is provided with a fifth placing groove. Specifically, the second guide is arranged in the fifth placing groove, and the second guide abuts against the inner wall of the cylinder barrel. The second guide piece is made of self-lubricating materials, and on one hand, the second guide piece can play a role in guiding and supporting; on the other hand, the sealing function can be achieved, namely the sealing performance between the piston and the cylinder barrel is improved; moreover, the auxiliary lubrication function can be achieved, and dry friction between the piston and the inner wall of the cylinder barrel is effectively avoided.

In above-mentioned technical scheme, the push rod is equipped with and holds the chamber, and electronic jar still includes: the first bearing seat is arranged in the accommodating cavity, the lead screw penetrates through the accommodating cavity, the axis of the lead screw is superposed with the axis of the push rod, the lead screw and the push rod rotate relatively through the first bearing seat, and a sixth placing groove is formed in the outer wall of the first bearing seat; and the third guide piece is arranged on the sixth placing groove and is abutted against the cavity wall of the accommodating cavity.

In this technical solution, the electric cylinder further includes a first bearing housing and a third guide. Specifically, be equipped with in the push rod and hold the chamber, the lead screw wears to locate the chamber that holds of push rod, and the axis of lead screw and the axis coincidence of push rod can be understood as, lead screw, push rod and cylinder, the axis collineation of three. The lead screw rotates relative to the push rod through the first bearing seat.

Furthermore, a sixth placing groove is formed in the outer wall of the first bearing seat, a third guide piece is arranged in the sixth placing groove and abuts against the accommodating cavity of the push rod, and the third guide piece is made of a self-lubricating material, so that on one hand, the effects of guiding and supporting can be achieved; on the other hand, the auxiliary lubrication function can be achieved, and dry friction between the first bearing seat and the cavity wall of the accommodating cavity is effectively avoided.

In the technical scheme, the screw is provided with the press-fit type pressure filling oil cup and the oil through hole, and one end of the oil through hole is communicated with the press-fit type pressure filling oil cup.

In this technical scheme, through set up press-fit type pressure filling oil cup and oil through hole on the screw, and the one end and the press-fit type pressure filling oil cup intercommunication of oil through hole, through setting up press-fit type pressure filling oil cup, can realize that the outside injects lubricating grease between screw and the lead screw, ensures lead screw assembly's lubricating property.

Furthermore, a grease injection hole is formed in the cylinder barrel, and a respirator is arranged at the grease injection hole. When the push rod stretches out, the oil through hole is communicated with the grease injection hole, the breather can be detached at the moment, and lubricating grease is injected into the press-fit type pressure injection oil cup through the grease injection hole by using a push-type oil gun, so that the operation is quick and convenient. The screw is provided with the oil through hole and the press-fit type pressure filling oil cup, so that grease can be filled into the screw assembly without disassembling the electric cylinder for lubrication.

In the above technical solution, the method further comprises: the second bearing block is connected with the cylinder barrel, the lead screw penetrates through the second bearing block, the lead screw and the cylinder barrel rotate relatively through the second bearing block, and the second bearing block is provided with a seventh placing groove; and the third sealing element is arranged in the seventh placing groove and is abutted against the cylinder barrel.

In this solution, the electric cylinder further includes a second bearing housing and a third seal. Specifically, the second bearing block links to each other with the cylinder, and the lead screw wears to locate the second bearing block, and the lead screw passes through the second bearing block and realizes relative rotation with the cylinder.

Furthermore, a seventh placing groove is formed in the second bearing seat, the third sealing element is arranged in the seventh placing groove, and the third sealing element abuts against the cylinder barrel. Through setting up the third sealing member, can improve the leakproofness between second bearing frame and the cylinder, prevent that rainwater etc. from entering into to corrode important spare part in the cylinder.

In the above technical solution, the method further comprises: a gearbox, comprising: the first gear is arranged in the box body and connected with the lead screw; the second gear is arranged in the box body and is meshed with the first gear; and the motor is in transmission connection with the second gear.

In this technical scheme, the electronic jar still includes gear box and motor. Wherein, the gear box includes box, first gear and second gear. Specifically, the box is connected with the second bearing seat, and the junction of box and second bearing seat is equipped with the sealing member, can improve the leakproofness between second bearing seat and the box, prevents that rainwater etc. from entering into inside corroding important spare part of electronic jar. Further, first gear and second gear all locate in the box. The first gear is connected with the lead screw, the second gear is in transmission connection with the motor, and the first gear is meshed with the second gear. The motor during operation, the second gear drives first gear revolve, and first gear can make the lead screw rotate, and the lead screw is at the rotation in-process, and the screw can take piston and the relative cylinder of push rod to remove to change rotary motion into linear motion, in order to satisfy the working requirement.

An embodiment of the second aspect of the present invention provides a construction machine, including: a frame body; the electric cylinder in any one of the above embodiments is arranged on the frame body.

According to an embodiment of the construction machine of the present invention, the construction machine includes a frame body and the electric cylinder in any of the above embodiments, and the electric cylinder is provided in the frame body. According to the electric cylinder, a sealing system (namely a sealing assembly) is designed, so that external rainwater and the like are prevented from entering the electric cylinder body to corrode the electric cylinder body, and the service life and the reliability of the electric cylinder are improved; a lubricating system (an oil storage tank, a guide part and the like) is designed, a self-lubricating material guide ring and a grease storage tank are adopted to ensure the lubricating performance in the cylinder, and the purpose that lubricating grease is directly injected into the screw assembly without disassembling the cylinder can be realized, so that the insufficient lubrication is avoided, and the maintenance cost is reduced; the trapezoidal screw rod assembly (namely the screw nut and the screw rod) is designed, the electric cylinder can be automatically locked at any position, and the safety of the electric cylinder is improved. The electric cylinder has sealing, lubricating and self-locking functions, can adapt to complex working conditions and is beneficial to expanding the application range.

The construction machine includes any one of the electric cylinders in the first aspect, so that the beneficial effects of any one of the embodiments are achieved, and details are not repeated herein.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 shows a schematic view of an electric cylinder according to an embodiment of the present invention;

FIG. 2 shows a partially enlarged schematic view of portion A of FIG. 1;

FIG. 3 is an enlarged partial view of portion B of FIG. 1;

fig. 4 shows a schematic view of a working machine according to an embodiment of the invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 4 is:

100: an electric cylinder; 111: a cylinder barrel; 112: a grease injection hole; 113: a respirator; 121: a lead screw; 122: a nut; 123: a press-fit type pressure filling oil cup; 124: an oil through hole; 125: a piston; 126: a fifth placing groove; 127: a push rod; 128: an accommodating chamber; 130: a guide sleeve; 131: a first placing groove; 132: a second placing groove; 133: a third placing groove; 134: a fourth placing groove; 135: an oil storage tank; 140: a first seal assembly; 141: a dust ring; 142: a first seal member; 150: a second seal assembly; 151: a second seal member; 161: a first guide member; 162: a second guide member; 163: a third guide member; 164: a third seal member; 171: a first bearing housing; 172: a sixth placing groove; 173: a second bearing housing; 174: a seventh placing groove; 180: a gear case; 181: a box body; 182: a first gear; 183: a second gear; 190: a motor; 200: an engineering machine; 210: a shelf body.

Detailed Description

In order that the above objects, features and advantages of the embodiments of the present invention can be more clearly understood, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and detailed description. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, embodiments of the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

An electric cylinder 100 and a construction machine 200 provided according to some embodiments of the present invention are described below with reference to fig. 1 to 4.

Example one

As shown in fig. 1 and 2, an embodiment of the present invention provides an electric cylinder 100 including a cylinder tube 111, a lead screw 121, a nut 122, a guide sleeve 130, a push rod 127, a first seal assembly 140, and a second seal assembly 150. Wherein, lead screw 121 wears to locate cylinder 111, and the axis of lead screw 121 and the coincidence of the axis of cylinder 111, lead screw 121 can rotate relative to cylinder 111. The nut 122 is disposed in the cylinder 111, the nut 122 is in threaded connection with the lead screw 121, and the friction between the threaded contact surfaces of the nut 122 and the lead screw 121 can satisfy the relative stillness between the lead screw 121 and the nut 122. In other words, when the electric cylinder 100 reaches the designated position and the motor 190 does not work any more, the lead screw 121 and the nut 122 are in a self-locking state, that is, the lead screw 121 and the nut 122 can be kept still at this time.

Further, a guide sleeve 130 is connected to the cylinder 111. Specifically, the guide sleeve 130 is connected to a port at one end of the cylinder 111, and the guide sleeve 130 is fixed to the cylinder 111. The guide sleeve 130 can be fixedly connected with the cylinder barrel 111 in a welding mode; alternatively, the guide sleeve 130 may be removably attached to the cylinder 111 by bolts or other means. Further, the push rod 127 is connected with the nut 122, and the push rod 127 is arranged through the guide sleeve 130. By arranging the guide sleeve 130, on one hand, the guide sleeve can play a role in guiding the push rod 127, and the end part of the push rod 127 can be ensured to smoothly extend out of or retract into the cylinder 111; on the other hand, the sealing function can be achieved to a certain extent, dust or other impurities are prevented from entering, and the service life of the electric dynamic effect is prolonged.

Further, the first seal member 140 is provided between the guide sleeve 130 and the push rod 127, and the sealing property between the guide sleeve 130 and the push rod 127 can be improved by providing the first seal member 140. The second seal assembly 150 is provided between the guide sleeve 130 and the cylinder 111, and the second seal assembly 150 can improve the sealing property between the guide sleeve 130 and the cylinder 111.

There are various complicated operating modes in the engineering application, for example, high wind and rain, etc., and ordinary electronic jar 100 is difficult to deal with complicated operating mode, if rainwater or impurity enter into electronic jar 100 inside, may cause the corruption of important spare part or out of control influence electronic jar 100's reliability and life-span, can harm operating personnel's personal safety even.

In the technical scheme defined by the invention, the sealing performance between the guide sleeve 130 and the cylinder barrel 111 and between the guide sleeve 130 and the push rod 127 can be improved by arranging the sealing components, so that impurities such as external rainwater or dust are effectively prevented from entering the interior of the electric cylinder 100, and important parts such as the lead screw 121 or gears are corroded, thereby being beneficial to improving the reliability and prolonging the service life of the electric cylinder 100. In addition, after the electric cylinder 100 reaches the designated position, when the motor 190 does not work any more, the screw rod 121 and the nut can be in a self-locking state and keep relatively static, so that the safety performance is improved, and the possibility of injuring operators under the condition of temporary power failure is greatly reduced.

Example two

As shown in fig. 1 and 2, the first seal assembly 140 includes a dust ring 141 and a first seal 142. Specifically, a first placing groove 131 is formed on one side of the guide sleeve 130 close to the push rod 127, the dust ring 141 is arranged in the first placing groove 131, and the dust ring 141 abuts against the push rod 127. By arranging the dustproof ring 141, on one hand, the dustproof ring can play a role in sealing and dust prevention; on the other hand, during the operation, the push rod 127 is continuously extended or retracted, and the dust ring 141 can scrape off the attachments on the surface of the push rod 127, thereby playing a role in cleaning to a certain extent.

Further, a second placing groove 132 is further disposed on one side of the guide sleeve 130 close to the push rod 127, the first sealing element 142 is disposed in the second placing groove 132, and the first sealing element 142 abuts against the push rod 127. By providing the first seal 142, the sealing performance between the guide sleeve 130 and the push rod 127 can be improved, and rainwater and the like can be prevented from entering the cylinder 111 and corroding important parts.

Further, the first placement groove 131 is located on a side of the second placement groove 132 facing away from the nut 122. It will be appreciated that the wiper 141 and the first seal 142 act as a two-layer seal shield between the cylinder 111 and the push rod 127, with the wiper 141 on the outside (i.e., away from the stepped nut) and the first seal 142 on the inside (i.e., close to the stepped nut).

It is noted that the first seal 142 may be an O-ring or other structure for sealing.

Further, the second seal assembly 150 includes a second seal 151. Specifically, a third placing groove 133 is formed on a side of the guide sleeve 130 close to the cylinder 111, the second sealing member 151 is disposed in the third placing groove 133, and the second sealing member 151 abuts against the cylinder 111. By providing the second seal 151, the sealing performance between the guide sleeve 130 and the cylinder tube 111 can be improved, and rainwater and the like can be prevented from entering the cylinder tube 111 and corroding important parts.

It is noted that the second seal 151 may be an O-ring or other structure for sealing.

EXAMPLE III

As shown in fig. 1 and 2, an oil storage groove 135 is further formed at a side of the guide sleeve 130 close to the push rod 127. The oil reservoir 135 can store grease during assembly to ensure that the cylinder body is filled with oil gas during the operation of the electric cylinder 100, thereby effectively preventing dry friction between the push rod 127 and the guide sleeve 130 or the cylinder 111. Further, the oil storage groove 135 is located on the side of the second placement groove 132 close to the nut 122, that is, the oil storage groove 135 is located on the inner side of the electric cylinder 100, so that the possibility that the grease in the oil storage groove 135 is contaminated by impurities such as rainwater or dust is greatly reduced.

Further, the electric cylinder 100 further includes a first guide 161. Specifically, a fourth placing groove 134 is further provided on a side of the guide sleeve 130 close to the push rod 127. The fourth placement groove 134 is located on the side of the second placement groove 132 close to the nut 122, and the oil reservoir 135 is located between the second placement groove 132 and the fourth placement groove 134. The first guide 161 is disposed in the fourth placement groove 134, and the first guide 161 abuts against the push rod 127. The first guide 161 is made of self-lubricating material, and on one hand, can play a role in guiding and supporting; on the other hand, the sealing function can be achieved, namely, the sealing performance between the guide sleeve 130 and the push rod 127 is improved; in addition, the lubricating grease can also play a role in auxiliary lubrication, so that the lubricating grease coated on the surface of the push rod 127 is paved, and the dry friction between the push rod 127 and the guide sleeve 130 is effectively avoided.

It is noted that the first guide 161 may be a guide ring or other structure.

Example four

As shown in fig. 1 and 3, the electric cylinder 100 further includes a piston 125 and a second guide 162. Specifically, the piston 125 is disposed in the cylinder 111, the piston 125 is connected to the nut 122, and an outer wall of the piston 125 abuts against an inner wall of the cylinder 111. During the rotation of the screw rod, the nut 122 drives the piston 125 and the push rod 127 to move, so as to convert the rotation motion into a linear motion.

Further, the outer wall of the piston 125 is provided with a fifth disposition groove 126. Specifically, the second guide 162 is provided in the fifth placement groove 126, and the second guide 162 abuts against the inner wall of the cylinder tube 111. The second guide piece 162 is made of self-lubricating material, so that on one hand, the function of guiding and supporting can be achieved; on the other hand, the sealing function can be achieved, namely, the sealing performance between the piston 125 and the cylinder 111 is improved; moreover, the auxiliary lubrication function can be achieved, and dry friction between the piston 125 and the inner wall of the cylinder 111 can be effectively avoided.

EXAMPLE five

As shown in fig. 1 and 2, the electric cylinder 100 further includes a first bearing housing 171 and a third guide 163. Specifically, an accommodating cavity 128 is formed in the push rod 127, the lead screw 121 is arranged in the accommodating cavity 128 of the push rod 127 in a penetrating manner, and the axis of the lead screw 121 coincides with the axis of the push rod 127, and it can be understood that the axes of the lead screw 121, the push rod 127 and the cylinder 111 are collinear. The lead screw 121 rotates relative to the push rod 127 through the first bearing seat 171.

Furthermore, a sixth placement groove 172 is formed in the outer wall of the first bearing seat 171, the third guide 163 is disposed in the sixth placement groove 172, the third guide 163 abuts against the accommodating cavity 128 of the push rod 127, and the third guide 163 is made of a self-lubricating material, so that on one hand, the functions of guiding and supporting can be achieved; on the other hand, the auxiliary lubrication function can be performed, so that dry friction between the first bearing seat 171 and the wall of the accommodating cavity 128 is effectively avoided.

EXAMPLE six

As shown in fig. 1 and 3, the nut 122 is provided with a press-fit type pressure filling cup 123 and an oil passage hole 124, and one end of the oil passage hole 124 communicates with the press-fit type pressure filling cup 123. By arranging the press-fit type pressure filling oil cup 123, lubricating grease can be filled between the nut and the lead screw from the outside, and the lubricating performance of the lead screw 121 assembly is ensured. Furthermore, a grease injection hole 112 is formed in the cylinder 111, and a breather 113 is arranged at the grease injection hole 112. When the push rod 127 extends out, the oil through hole 124 is communicated with the grease injection hole 112, at this time, the breather 113 can be detached, and a push-type oil gun is used for injecting lubricating grease into the press-fit type pressure injection oil cup 123 through the grease injection hole 112, so that the operation is fast and convenient. The screw is provided with the oil through hole 124 and the press-fit type pressure filling oil cup 123, so that grease can be filled and lubricated for the screw rod 121 assembly without disassembling the electric cylinder 100.

EXAMPLE seven

As shown in fig. 1 and 3, the electric cylinder 100 further includes a second bearing housing 173 and a third seal 164. Specifically, the second bearing block 173 is connected to the cylinder 111, the lead screw 121 is inserted into the second bearing block 173, and the lead screw 121 and the cylinder 111 rotate relative to each other through the second bearing block 173.

Further, a seventh placement groove 174 is formed on the second bearing seat 173, the third sealing member 164 is disposed in the seventh placement groove 174, and the third sealing member 164 abuts against the cylinder 111. By providing the third seal 164, the sealing performance between the second bearing block 173 and the cylinder tube 111 can be improved, and rainwater and the like can be prevented from entering the cylinder tube 111 and corroding important parts.

Further, the electric cylinder 100 further includes a gear box 180 and a motor 190. The gear box 180 includes a box 181, a first gear 182, and a second gear 183. Specifically, the box body 181 is connected to the second bearing seat 173, and a sealing member is disposed at a connection position between the box body 181 and the second bearing seat 173, so that the sealing property between the second bearing seat 173 and the box body 181 can be improved, and rainwater and the like can be prevented from entering the electric cylinder 100 to corrode important parts. Further, the first gear 182 and the second gear 183 are both provided in the case 181. The first gear 182 is connected with the lead screw 121, the second gear 183 is in transmission connection with the motor 190, and the first gear 182 is meshed with the second gear 183. When the motor 190 works, the second gear 183 drives the first gear 182 to rotate, the first gear 182 enables the screw rod 121 to rotate, and in the rotating process of the screw rod 121, the nut 122 drives the piston 125 and the push rod 127 to move relative to the cylinder 111, so that the rotary motion is converted into the linear motion to meet the working requirement.

Example eight

As shown in fig. 4, a construction machine 200 according to an embodiment of the present invention includes a frame body 210 and the electric cylinder 100 in any of the embodiments, where the electric cylinder 100 is disposed on the frame body 210. In the electric cylinder 100 of the invention, a sealing system (namely a sealing assembly) is designed to prevent external rainwater and the like from entering the interior of the electric cylinder 100 to corrode the cylinder body, so that the service life and the reliability of the electric cylinder 100 are improved; a lubricating system (an oil storage tank 135, a guide part and the like) is designed, a self-lubricating material guide ring and a grease storage tank are adopted to ensure the lubricating performance in the cylinder, and lubricating grease can be directly injected into the screw rod 121 assembly without disassembling the cylinder, so that insufficient lubrication is avoided, and the maintenance cost is reduced; by designing the trapezoidal screw 121 assembly (i.e., the nut 122 and the screw 121), the electric cylinder 100 can be automatically locked at any position, and the safety of the electric cylinder 100 is improved. The electric cylinder 100 has sealing, lubricating and self-locking functions, can adapt to complex working conditions, and is beneficial to expanding the application range.

According to the embodiment of the electric cylinder and the engineering machinery, the sealing performance between the guide sleeve and the cylinder barrel and between the guide sleeve and the push rod can be improved by arranging the sealing assembly, so that impurities such as external rainwater or dust are effectively prevented from entering the electric cylinder, important parts such as a lead screw or a gear are corroded, and the reliability and the service life of the electric cylinder are improved. In addition, after the electric cylinder reaches the designated position, when the motor does not work any more, the screw rod and the screw nut can be in a self-locking state and keep relatively static, so that the safety performance is improved, and the possibility of injuring operators under the condition of temporary power failure is greatly reduced.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric cylinder (100), comprising:

a cylinder (111);

the lead screw (121) penetrates through the cylinder barrel (111), and the lead screw (121) can rotate relative to the cylinder barrel (111);

the screw nut (122) is arranged in the cylinder barrel (111), and the screw nut (122) is in threaded connection with the lead screw (121);

the guide sleeve (130) is connected with the cylinder barrel (111), and the guide sleeve (130) is relatively fixed with the cylinder barrel (111);

the push rod (127) is connected with the nut (122), and the push rod (127) penetrates through the guide sleeve (130);

a first sealing assembly (140) arranged between the guide sleeve (130) and the push rod (127);

and the second sealing assembly (150) is arranged between the guide sleeve (130) and the cylinder barrel (111).

2. The electric cylinder (100) according to claim 1, wherein a first placing groove (131) and a second placing groove (132) are provided on a side of the guide sleeve (130) close to the push rod (127), the first placing groove (131) is located on a side of the second placing groove (132) facing away from the nut (122), and the first sealing assembly (140) comprises:

a dust ring (141) provided in the first placement groove (131), the dust ring (141) abutting against the push rod (127);

and a first sealing member (142) provided in the second placement groove (132), wherein the first sealing member (142) abuts against the push rod (127).

3. The electric cylinder (100) according to claim 1, wherein a third placing groove (133) is provided on a side of the guide sleeve (130) close to the cylinder tube (111), and the second seal assembly (150) comprises:

and a second seal (151) provided in the third placement groove (133), wherein the second seal (151) abuts against the cylinder (111).

4. The electric cylinder (100) according to claim 2, wherein an oil storage groove (135) and a fourth placement groove (134) are further provided on a side of the guide sleeve (130) close to the push rod (127), the oil storage groove (135) and the fourth placement groove (134) are both located on a side of the second placement groove (132) close to the nut (122), the oil storage groove (135) is located between the second placement groove (132) and the fourth placement groove (134), and the electric cylinder (100) further comprises:

and a first guide (161) provided in the fourth placement groove (134), wherein the first guide (161) abuts against the push rod (127).

5. The electric cylinder (100) according to claim 1, further comprising:

the piston 125 is arranged in the cylinder barrel (111), the piston 125 is connected with the nut (122), the outer wall of the piston 125 abuts against the inner wall of the cylinder barrel (111), and a fifth placing groove 126 is formed in the outer wall of the piston 125;

and a second guide (162) provided in the fifth placement groove 126, wherein the second guide (162) abuts against the inner wall of the cylinder (111).

6. The electric cylinder (100) according to claim 1, wherein the push rod (127) is provided with a receiving chamber (128), and the electric cylinder (100) further comprises:

the first bearing seat (171) is arranged in the accommodating cavity (128), the lead screw (121) penetrates through the accommodating cavity (128), the axis of the lead screw (121) is overlapped with the axis of the push rod (127), the lead screw (121) and the push rod (127) relatively rotate through the first bearing seat (171), and a sixth placing groove (172) is formed in the outer wall of the first bearing seat (171);

and a third guide (163) provided in the sixth placement groove (172), wherein the third guide (163) abuts against the wall of the accommodation chamber (128).

7. The electric cylinder (100) according to claim 1, wherein the nut (122) is provided with a press-fit type press-filling oil cup (123) and an oil passage hole (124), and one end of the oil passage hole (124) communicates with the press-fit type press-filling oil cup (123).

8. The electric cylinder (100) according to claim 1, further comprising:

the second bearing seat (173) is connected with the cylinder barrel (111), the lead screw (121) penetrates through the second bearing seat (173), the lead screw (121) rotates relative to the cylinder barrel (111) through the second bearing seat (173), and the second bearing seat (173) is provided with a seventh placing groove (174);

and a third seal (164) provided in the seventh placement groove (174), wherein the third seal (164) abuts against the cylinder (111).

9. The electric cylinder (100) according to claim 8, further comprising:

a gearbox (180) comprising:

a box body (181) connected with the second bearing seat (173),

the first gear (182) is arranged in the box body (181), and the first gear (182) is connected with the lead screw (121);

a second gear (183) provided in the case (181), the second gear (183) being engaged with the first gear (182);

and the motor (190) is in transmission connection with the second gear (183).

10. A work machine (200), comprising:

a frame body (210);

the electric cylinder (100) according to any one of claims 1 to 9, provided to the frame body (210).