Electric cylinder and construction machinery

Abstract

Embodiments of the present invention provide an electric cylinder and a construction machinery. The electric cylinder includes: a cylinder barrel; a lead screw rotatably passing through the cylinder barrel; a nut provided in the cylinder barrel and threadedly connected to the lead screw; a guide sleeve fixedly connected to the cylinder barrel; a push rod connected to the nut and passing through the guide sleeve; a first sealing assembly provided between the guide sleeve and the push rod; and a second sealing assembly provided between the guide sleeve and the cylinder barrel. In the technical solution of the present invention, by providing the sealing assemblies, the sealing performance between the guide sleeve and the cylinder barrel, and between the guide sleeve and the push rod can be improved, effectively preventing external impurities such as rainwater or dust from entering the interior of the electric cylinder and corroding important components such as the lead screw or gears, which is beneficial to improving the reliability and service life of the electric cylinder. In addition, after the electric cylinder reaches the designated position and the motor stops working, the lead screw and the nut can be in a self-locking state and remain relatively stationary, which is beneficial to improving the safety performance.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of construction machinery, and more particularly, to an electric cylinder and a construction machinery. Background Art

[0002] With the continuous development of the automation process of construction machinery, electric cylinders have gradually replaced hydraulic cylinders in linear displacement drive. Electric cylinders use screw drives, powered by motors, operate stably, and do not require external hydraulic oil sources, and have been widely used in weaponry and industrial fields.

[0003] In engineering applications, there are various complex working conditions, such as strong winds and heavy rains. Ordinary electric cylinders are difficult to cope with complex working conditions. If rainwater or impurities enter the interior of the electric cylinder, it may cause corrosion or out-of-control of important components, affecting the reliability and lifespan of the electric cylinder, and even endangering the personal safety of operators. Summary of the Invention

[0004] 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.

[0005] Another object of an embodiment of the present invention is to provide a construction machinery having the above electric cylinder.

[0006] To achieve the above object, an embodiment of the first aspect of the present invention provides an electric cylinder, including: a cylinder barrel; a lead screw passing through the cylinder barrel, the lead screw being capable of rotating relative to the cylinder barrel; a nut provided in the cylinder barrel, the nut being threadedly connected to the lead screw; a guide sleeve connected to the cylinder barrel, the guide sleeve being relatively fixed to the cylinder barrel; a push rod connected to the nut, the push rod passing through the guide sleeve; a first sealing assembly provided between the guide sleeve and the push rod; and a second sealing assembly provided between the guide sleeve and the cylinder barrel.

[0007] According to the embodiment of the electric cylinder provided by the present invention, by providing a sealing assembly, the sealing performance between the guide sleeve and the cylinder barrel, and between the guide sleeve and the push rod can be improved, effectively preventing external rainwater, dust and other impurities from entering the interior of the electric cylinder, corroding important components such as the lead screw or gears, and being beneficial to improving the reliability and service life of the electric cylinder. In addition, after the electric cylinder reaches the specified position and the motor stops working, the lead screw and the nut can be in a self-locking state and remain relatively stationary, which is beneficial to improving safety performance and greatly reducing the possibility of injuring operators in the case of temporary power failure.

[0008] Specifically, the electric cylinder includes a cylinder barrel, a lead screw, a nut, a guide sleeve, a push rod, a first sealing assembly, and a second sealing assembly. Among them, the lead screw is disposed through the cylinder barrel, the axis of the lead screw coincides with the axis of the cylinder barrel, and the lead screw can rotate relative to the cylinder barrel. The nut is disposed inside the cylinder barrel, the nut is threadedly connected to the lead screw, and the frictional force between the nut and the threaded contact surface of the lead screw can satisfy the relative rest between the lead screw and the nut. In other words, after the electric cylinder reaches the specified position and the motor stops working, the lead screw and the nut are in a self-locking state, that is, the lead screw and the nut can remain stationary at this time.

[0009] Further, the guide sleeve is connected to the cylinder barrel. Specifically, the guide sleeve is connected to the port at one end of the cylinder barrel, and the guide sleeve is relatively fixed to the cylinder barrel. The guide sleeve can be fixedly connected to the cylinder barrel by welding; or, the guide sleeve is detachably connected to the cylinder barrel by bolts or other means. Further, the push rod is connected to the nut, and the push rod is disposed through the guide sleeve. By providing the guide sleeve, on the one hand, it can play a guiding role for the push rod to ensure that the end of the push rod can smoothly extend or retract from the cylinder barrel; on the other hand, it can also play a sealing role to a certain extent, preventing dust or other impurities from entering, which is beneficial to improving the service life of the electric cylinder.

[0010] Further, the first sealing assembly is disposed between the guide sleeve and the push rod. By providing the first sealing assembly, the sealing performance between the guide sleeve and the push rod can be improved. The second sealing assembly is disposed between the guide sleeve and the cylinder barrel. By providing the second sealing assembly, the sealing performance between the guide sleeve and the cylinder barrel can be improved.

[0011] There are various complex working conditions in engineering applications, such as strong winds and heavy rains. Ordinary electric cylinders are difficult to cope with complex working conditions. If rainwater or impurities enter the inside of the electric cylinder, it may cause corrosion or out-of-control of important components, affecting the reliability and service life of the electric cylinder, and even endangering the personal safety of operators.

[0012] In the technical solution defined by the present invention, by providing a sealing assembly, the sealing performance between the guide sleeve and the cylinder barrel, and between the guide sleeve and the push rod can be improved, effectively preventing external rainwater, dust and other impurities from entering the inside of the electric cylinder, corroding important components such as lead screws or gears, which is beneficial to improving the reliability and service life of the electric cylinder. In addition, after the electric cylinder reaches the specified position and the motor stops working, the lead screw and the nut can be in a self-locking state and remain relatively stationary, which is beneficial to improving the safety performance and greatly reducing the possibility of injuring operators in the case of temporary power failure.

[0013] In addition, the above technical solution provided by the present invention may also have the following additional technical features:

[0014] In the above technical solution, a first placement groove and a second placement groove are provided on a side of the guide sleeve close to the push rod, and the first placement groove is located on a side of the second placement groove away from the nut. The first sealing assembly includes: a dust ring, which is provided in the first placement groove, and the dust ring is against the push rod; a first sealing member, which is provided in the second placement groove, and the first sealing member is against the push rod.

[0015] In this technical solution, the first sealing assembly includes a dust ring and a first sealing member. Specifically, a first placement groove is provided on the side of the guide sleeve close to the push rod, and the dust ring is provided in the first placement groove, and the dust ring abuts against the push rod. By providing the dust ring, on the one hand, it can play a role of sealing and dust prevention; on the other hand, during the working process, the push rod is constantly extended or retracted, and the dust ring can scrape off the attachments on the surface of the push rod, playing a cleaning role to a certain extent.

[0016] Furthermore, a second placement groove is provided on one side of the guide sleeve close to the push rod, and the first seal is provided in the second placement groove, and the first seal abuts against the push rod. By providing the first seal, the sealing performance between the guide sleeve and the push rod can be improved, and rainwater and the like can be prevented from entering the cylinder and corroding important parts.

[0017] Further, the first placement groove is located on the side of the second placement groove away from the nut. It can be understood that the dust ring and the first sealing member serve as two layers of sealing protection between the cylinder barrel and the push rod, the dust ring is on the outside (i.e. away from the trapezoidal nut), and the first sealing member is on the inside (i.e. close to the trapezoidal nut).

[0018] It is worth noting that the first sealing member may be an O-ring or other sealing structure.

[0019] In the above technical solution, a third placement groove is provided on one side of the guide sleeve close to the cylinder barrel, and the second sealing assembly includes: a second sealing member provided in the third placement groove, and the second sealing member abuts against the cylinder barrel.

[0020] In this technical solution, the second sealing assembly includes a second sealing member. Specifically, a third placement groove is provided on the side of the guide sleeve close to the cylinder barrel, and the second sealing member is provided in the third placement groove, and the second sealing member abuts against the cylinder barrel. By providing the second sealing member, the sealing between the guide sleeve and the cylinder barrel can be improved, and rainwater and the like can be prevented from entering the cylinder barrel to corrode important parts.

[0021] It is worth noting that the second sealing member may be an O-ring or other sealing structure.

[0022] In the above technical solution, an oil storage tank and a fourth placement tank are also provided on the side of the guide sleeve close to the push rod. The oil storage tank and the fourth placement tank are both located on the side of the second placement tank close to the nut. The oil storage tank is located between the second placement tank and the fourth placement tank. The electric cylinder also includes: a first guide member, which is arranged in the fourth placement tank, and the first guide member is against the push rod.

[0023] In this technical solution, an oil storage groove is provided on one side of the guide sleeve close to the push rod. The oil storage groove can store grease during assembly to ensure that there is oil and gas inside the cylinder body when the electric cylinder operates, effectively preventing dry friction between the push rod and the guide sleeve or the cylinder barrel. Further, the oil storage groove is located on one side of the second placement groove close to the lead nut, that is, the oil storage groove is inside the electric cylinder, greatly reducing the possibility of the grease in the oil storage groove being contaminated by impurities such as rainwater or dust.

[0024] Further, the electric cylinder further includes a first guiding member. Specifically, a fourth placement groove is further provided on one side of the guide sleeve close to the push rod. The fourth placement groove is located on one side of the second placement groove close to the lead nut, and the oil storage groove is located between the second placement groove and the fourth placement groove. The first guiding member is disposed in the fourth placement groove and abuts against the push rod. The first guiding member is made of a self-lubricating material. On the one hand, it can play a guiding and supporting role; on the other hand, it can play a sealing role, that is, improve the sealing performance between the guide sleeve and the push rod; furthermore, it can also play an auxiliary lubricating role, spreading the grease coated on the surface of the push rod, effectively avoiding dry friction between the push rod and the guide sleeve.

[0025] It should be noted that the first guiding member can be a guide ring or other structures.

[0026] In the above technical solution, it further includes: a piston disposed in the cylinder barrel, the piston is connected to the lead nut, the outer wall of the piston abuts against the inner wall of the cylinder barrel, and a fifth placement groove is provided on the outer wall of the piston; a second guiding member disposed in the fifth placement groove, and the second guiding member abuts against the inner wall of the cylinder barrel.

[0027] In this technical solution, the electric cylinder further includes a piston and a second guiding member. Specifically, the piston is disposed in the cylinder barrel, the piston is connected to the lead nut, and the outer wall of the piston abuts against the inner wall of the cylinder barrel. During the rotation of the lead screw, the lead nut will drive the piston and the push rod to move, thereby converting the rotational motion into a linear motion.

[0028] Further, a fifth placement groove is provided on the outer wall of the piston. Specifically, the second guiding member is disposed in the fifth placement groove, and the second guiding member abuts against the inner wall of the cylinder barrel. The second guiding member is made of a self-lubricating material. On the one hand, it can play a guiding and supporting role; on the other hand, it can play a sealing role, that is, improve the sealing performance between the piston and the cylinder barrel; furthermore, it can also play an auxiliary lubricating role, effectively avoiding dry friction between the piston and the inner wall of the cylinder barrel.

[0029] In the above technical solution, the push rod is provided with a receiving cavity, and the electric cylinder further includes: a first bearing seat disposed in the receiving cavity, a lead screw passing through the receiving cavity, the axis of the lead screw coinciding with the axis of the push rod, the lead screw being relatively rotatable with respect to the push rod through the first bearing seat, and a sixth placement groove being provided on the outer wall of the first bearing seat; a third guiding member disposed in the sixth placement groove, the third guiding member abutting against the wall of the receiving cavity.

[0030] In this technical solution, the electric cylinder further includes a first bearing seat and a third guiding member. Specifically, a receiving cavity is provided inside the push rod, the lead screw passes through the receiving cavity of the push rod, and the axis of the lead screw coincides with the axis of the push rod. It can be understood that the axes of the lead screw, the push rod, and the cylinder barrel are collinear. The lead screw is relatively rotatable with respect to the push rod through the first bearing seat.

[0031] Furthermore, a sixth placement groove is provided on the outer wall of the first bearing seat, the third guiding member is disposed in the sixth placement groove, and the third guiding member abuts against the receiving cavity of the push rod. The third guiding member is made of a self-lubricating material. On the one hand, it can play a guiding and supporting role; on the other hand, it can also play an auxiliary lubricating role, effectively avoiding dry friction between the first bearing seat and the wall of the receiving cavity.

[0032] In the above technical solution, the nut is provided with a press-fitted grease cup and an oil passage hole, and one end of the oil passage hole communicates with the press-fitted grease cup.

[0033] In this technical solution, by providing a press-fitted grease cup and an oil passage hole on the nut, and one end of the oil passage hole communicating with the press-fitted grease cup, by providing the press-fitted grease cup, it is possible to inject grease from the outside between the nut and the lead screw, ensuring the lubrication performance of the lead screw assembly.

[0034] Furthermore, a grease injection hole is provided on the cylinder barrel, and a breather is provided at the grease injection hole. When the push rod extends, the oil passage hole and the grease injection hole communicate. At this time, the breather can be removed, and a hand-pushed oil gun can be used to inject grease into the press-fitted grease cup through the grease injection hole, which is fast and convenient. The nut is designed with an oil passage hole and a press-fitted grease cup installed, so that it is possible to grease and lubricate the lead screw assembly without disassembling the electric cylinder.

[0035] In the above technical solution, it further includes: a second bearing seat connected to the cylinder barrel, a lead screw passing through the second bearing seat, the lead screw being relatively rotatable with respect to the cylinder barrel through the second bearing seat, and a seventh placement groove being provided on the second bearing seat; a third sealing member disposed in the seventh placement groove, the third sealing member abutting against the cylinder barrel.

[0036] In this technical solution, the electric cylinder further includes a second bearing seat and a third sealing member. Specifically, the second bearing seat is connected to the cylinder barrel, the lead screw passes through the second bearing seat, and the lead screw is relatively rotatable with respect to the cylinder barrel through the second bearing seat.

[0037] Further, a seventh placement groove is provided on the second bearing block, and a third seal is disposed in the seventh placement groove and abuts against the cylinder barrel. By providing the third seal, the sealing performance between the second bearing block and the cylinder barrel can be improved, preventing rainwater and the like from entering the cylinder barrel to corrode important components.

[0038] In the above technical solution, it further includes: a gearbox, including: a box body connected to the second bearing block, a first gear disposed in the box body and connected to the lead screw; a second gear disposed in the box body and meshing with the first gear; and a motor drivingly connected to the second gear.

[0039] In this technical solution, the electric cylinder further includes a gearbox and a motor. Among them, the gearbox includes a box body, a first gear, and a second gear. Specifically, the box body is connected to the second bearing block, and a seal is provided at the connection between the box body and the second bearing block, which can improve the sealing performance between the second bearing block and the box body and prevent rainwater and the like from entering the interior of the electric cylinder to corrode important components. Further, both the first gear and the second gear are disposed in the box body. The first gear is connected to the lead screw, the second gear is drivingly connected to the motor, and the first gear meshes with the second gear. When the motor operates, the second gear drives the first gear to rotate, and the first gear can cause the lead screw to rotate. During the rotation of the lead screw, the nut will drive the piston and the push rod to move relative to the cylinder barrel, thereby converting the rotational motion into a linear motion to meet the working requirements.

[0040] An embodiment of the second aspect of the present invention provides a construction machinery, including: a frame body; and the electric cylinder in any of the above embodiments disposed on the frame body.

[0041] According to the embodiment of the construction machinery of the present invention, the construction machinery includes a frame body and the electric cylinder in any of the above embodiments, and the electric cylinder is disposed on the frame body. The electric cylinder in the present invention designs a sealing system (i.e., a sealing component) to prevent external rainwater and the like from entering the interior of the electric cylinder body to corrode the cylinder body, improving the service life and reliability of the electric cylinder; designs a lubrication system (oil storage groove and guide members, etc.), uses self-lubricating material guide rings and grease storage grooves to ensure the lubrication performance in the cylinder, and can directly inject grease into the lead screw assembly without disassembling the cylinder, avoiding insufficient lubrication and reducing maintenance costs; designs a trapezoidal lead screw assembly (i.e., a nut and a lead screw), and the electric cylinder can be automatically locked at any position, improving the safety of the electric cylinder. The electric cylinder has the functions of sealing, lubrication, and self-locking, can adapt to complex working conditions, and is beneficial to expanding the scope of application.

[0042] Among them, since the construction machinery includes any of the electric cylinders in the above first aspect, it has the beneficial effects of any of the above embodiments, which will not be elaborated here.

[0043] The additional aspects and advantages of the embodiments of the present invention will become apparent in the following description part or be understood through the practice of the present invention. Brief Description of the Drawings

[0044] Figure 1 A schematic diagram of an electric cylinder according to an embodiment of the present invention is shown;

[0045] Figure 2 It shows Figure 1 A partial enlarged schematic diagram of part A in

[0046] Figure 3 It shows Figure 1 A partial enlarged schematic diagram of part B in

[0047] Figure 4 A schematic diagram of a construction machine according to an embodiment of the present invention is shown.

[0048] Wherein, Figures 1 to 4 The corresponding relationship between the reference numerals and the component names in

[0049] 100: Electric cylinder; 111: Cylinder barrel; 112: Grease injection hole; 113: Breather; 121: Lead screw; 122: Nut; 123: Press-fit type grease cup; 124: Oil passage hole; 125: Piston; 126: Fifth placement groove; 127: Push rod; 128: Accommodation cavity; 130: Guide sleeve; 131: First placement groove; 132: Second placement groove; 133: Third placement groove; 134: Fourth placement groove; 135: Oil storage tank; 140: First sealing assembly; 141: Dust seal; 142: First seal; 150: Second sealing assembly; 151: Second seal; 161: First guide; 162: Second guide; 163: Third guide; 164: Third seal; 171: First bearing seat; 172: Sixth placement groove; 173: Second bearing seat; 174: Seventh placement groove; 180: Gear box; 181: Housing; 182: First gear; 183: Second gear; 190: Motor; 200: Construction machine; 210: Frame. Detailed Description of the Embodiments

[0050] In order to more clearly understand the above-mentioned objects, features and advantages of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0051] In the following description, many specific details are set forth in order to fully understand the present invention. However, the embodiments of the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the limitations of the specific embodiments disclosed below.

[0052] Next, refer to Figures 1 to 4Describe the electric cylinder 100 and the construction machinery 200 provided according to some embodiments of the present invention.

[0053] Embodiment 1

[0054] As Figure 1 And Figure 2 As shown, the electric cylinder 100 provided by an embodiment of the present invention includes a cylinder barrel 111, a lead screw 121, a lead nut 122, a guide sleeve 130, a push rod 127, a first sealing assembly 140, and a second sealing assembly 150. Among them, the lead screw 121 is disposed through the cylinder barrel 111, the axis of the lead screw 121 coincides with the axis of the cylinder barrel 111, and the lead screw 121 can rotate relative to the cylinder barrel 111. The lead nut 122 is disposed inside the cylinder barrel 111, the lead nut 122 is threadedly connected to the lead screw 121, and the frictional force between the lead nut 122 and the threaded contact surface of the lead screw 121 can satisfy the relative rest between the lead screw 121 and the lead nut 122. In other words, after the electric cylinder 100 reaches the specified position and the motor 190 stops working, the lead screw 121 and the lead nut 122 are in a self-locking state, that is, the lead screw 121 and the lead nut 122 can remain stationary at this time.

[0055] Further, the guide sleeve 130 is connected to the cylinder barrel 111. Specifically, the guide sleeve 130 is connected to the port of one end of the cylinder barrel 111, and the guide sleeve 130 is relatively fixed to the cylinder barrel 111. The guide sleeve 130 can be fixedly connected to the cylinder barrel 111 by welding; or, the guide sleeve 130 is detachably connected to the cylinder barrel 111 by bolts or other means. Further, the push rod 127 is connected to the lead nut 122, and the push rod 127 is disposed through the guide sleeve 130. By providing the guide sleeve 130, on the one hand, it can play a guiding role for the push rod 127 to ensure that the end of the push rod 127 can smoothly extend or retract from the cylinder barrel 111; on the other hand, it can also play a sealing role to a certain extent, preventing dust or other impurities from entering, which is beneficial to improving the service life of the electric cylinder.

[0056] Further, the first sealing assembly 140 is disposed between the guide sleeve 130 and the push rod 127. By providing the first sealing assembly 140, the sealing performance between the guide sleeve 130 and the push rod 127 can be improved. The second sealing assembly 150 is disposed between the guide sleeve 130 and the cylinder barrel 111. By providing the second sealing assembly 150, the sealing performance between the guide sleeve 130 and the cylinder barrel 111 can be improved.

[0057] There are various complex working conditions in engineering applications, such as strong winds and heavy rains. Ordinary electric cylinders 100 are difficult to cope with complex working conditions. If rainwater or impurities enter the inside of the electric cylinder 100, it may cause corrosion or out-of-control of important components, affecting the reliability and life of the electric cylinder 100, and even endangering the personal safety of operators.

[0058] In the technical solution defined in the present 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 setting a sealing component, effectively preventing external impurities such as rainwater or dust from entering the interior of the electric cylinder 100 and corroding important parts such as the lead screw 121 or gears, which is beneficial to improving the reliability and service life of the electric cylinder 100. In addition, after the electric cylinder 100 reaches the specified position and the motor 190 is no longer working, the lead screw 121 and the nut can be in a self-locking state and remain relatively still, which is beneficial to improving safety performance and greatly reducing the possibility of injuring operators in the event of a temporary power outage.

[0059] Embodiment 2

[0060] like Figure 1 and Figure 2 As shown, the first sealing assembly 140 includes a dust ring 141 and a first sealing member 142. Specifically, a first placement groove 131 is provided on one side of the guide sleeve 130 close to the push rod 127, and the dust ring 141 is provided in the first placement groove 131, and the dust ring 141 abuts against the push rod 127. By providing the dust ring 141, on the one hand, it can play a role of sealing and dust prevention; on the other hand, during the working process, 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, playing a cleaning role to a certain extent.

[0061] Furthermore, a second placement groove 132 is further provided on one side of the guide sleeve 130 close to the push rod 127, and a first sealing member 142 is provided in the second placement groove 132, and the first sealing member 142 abuts against the push rod 127. By providing the first sealing member 142, the sealing performance between the guide sleeve 130 and the push rod 127 can be improved, and rainwater and the like are prevented from entering the cylinder 111 to corrode important parts.

[0062] Further, the first placement groove 131 is located on the side of the second placement groove 132 away from the nut 122. It can be understood that the dust ring 141 and the first sealing member 142 serve as two layers of sealing protection between the cylinder barrel 111 and the push rod 127, the dust ring 141 is located on the outside (i.e., away from the trapezoidal nut), and the first sealing member 142 is located on the inside (i.e., close to the trapezoidal nut).

[0063] It is worth noting that the first sealing member 142 may be an O-ring or other sealing structure.

[0064] Furthermore, the second sealing assembly 150 includes a second seal 151. Specifically, a third placement groove 133 is provided on one side of the guide sleeve 130 close to the cylinder barrel 111. The second seal 151 is disposed in the third placement groove 133 and abuts against the cylinder barrel 111. By providing the second seal 151, the sealing performance between the guide sleeve 130 and the cylinder barrel 111 can be improved, preventing rainwater and the like from entering the cylinder barrel 111 to corrode important components.

[0065] It should be noted that the second seal 151 can be an O-ring or other structures for sealing.

[0066] Embodiment III

[0067] As Figure 1 and Figure 2 shown, an oil storage groove 135 is further provided on one side of the guide sleeve 130 close to the push rod 127. The oil storage groove 135 can store grease during assembly to ensure that there is oil and gas inside the cylinder body when the electric cylinder 100 operates, effectively preventing dry friction between the push rod 127 and the guide sleeve 130 or the cylinder barrel 111. Further, the oil storage groove 135 is located on one side of the second placement groove 132 close to the lead nut 122, that is, the oil storage groove 135 is inside the electric cylinder 100, greatly reducing the possibility of the grease in the oil storage groove 135 being contaminated by impurities such as rainwater or dust.

[0068] Furthermore, the electric cylinder 100 further includes a first guiding member 161. Specifically, a fourth placement groove 134 is further provided on one side of the guide sleeve 130 close to the push rod 127. The fourth placement groove 134 is located on one side of the second placement groove 132 close to the lead nut 122, and the oil storage groove 135 is located between the second placement groove 132 and the fourth placement groove 134. The first guiding member 161 is disposed in the fourth placement groove 134 and abuts against the push rod 127. The first guiding member 161 is made of a self-lubricating material. On the one hand, it can play a guiding and supporting role; on the other hand, it can play a sealing role, that is, improve the sealing performance between the guide sleeve 130 and the push rod 127; furthermore, it can also play an auxiliary lubricating role, spreading the grease coated on the surface of the push rod 127, effectively avoiding dry friction between the push rod 127 and the guide sleeve 130.

[0069] It should be noted that the first guiding member 161 can be a guide ring or other structures.

[0070] Embodiment IV

[0071] As Figure 1 and Figure 3As shown, the electric cylinder 100 further includes a piston 125 and a second guide member 162. Specifically, the piston 125 is disposed within the cylinder barrel 111. The piston 125 is connected to the nut 122, and the outer wall of the piston 125 abuts against the inner wall of the cylinder barrel 111. During the rotation of the lead screw, the nut 122 drives the piston 125 and the push rod 127 to move, thereby converting the rotational motion into a linear motion.

[0072] Furthermore, a fifth placement groove 126 is provided on the outer wall of the piston 125. Specifically, the second guide member 162 is disposed within the fifth placement groove 126, and the second guide member 162 abuts against the inner wall of the cylinder barrel 111. The second guide member 162 is made of a self-lubricating material. On the one hand, it can play a role in guiding and supporting; on the other hand, it can play a sealing role, that is, improve the sealing performance between the piston 125 and the cylinder barrel 111; furthermore, it can also play an auxiliary lubricating role, effectively avoiding dry friction between the piston 125 and the inner wall of the cylinder barrel 111.

[0073] Embodiment Five

[0074] As Figure 1 and Figure 2 shown, the electric cylinder 100 further includes a first bearing seat 171 and a third guide member 163. Specifically, a receiving cavity 128 is provided within the push rod 127, and the lead screw 121 passes through the receiving cavity 128 of the push rod 127. The axis of the lead screw 121 coincides with the axis of the push rod 127. It can be understood that the axes of the lead screw 121, the push rod 127, and the cylinder barrel 111 are collinear. The lead screw 121 rotates relative to the push rod 127 through the first bearing seat 171.

[0075] Furthermore, a sixth placement groove 172 is provided on the outer wall of the first bearing seat 171. The third guide member 163 is disposed within the sixth placement groove 172, and the third guide member 163 abuts against the receiving cavity 128 of the push rod 127. The third guide member 163 is made of a self-lubricating material. On the one hand, it can play a role in guiding and supporting; on the other hand, it can also play an auxiliary lubricating role, effectively avoiding dry friction between the first bearing seat 171 and the cavity wall of the receiving cavity 128.

[0076] Embodiment Six

[0077] As Figure 1 and Figure 3As shown in the figure, the nut 122 is provided with a press-fitted grease cup 123 and an oil passage hole 124. One end of the oil passage hole 124 communicates with the press-fitted grease cup 123. By providing the press-fitted grease cup 123, it is possible to inject grease between the nut and the lead screw from the outside, ensuring the lubrication performance of the lead screw 121 assembly. Further, the cylinder block 111 is provided with a grease injection hole 112, and a breather 113 is provided at the grease injection hole 112. When the push rod 127 extends out, the oil passage hole 124 and the grease injection hole 112 communicate. At this time, the breather 113 can be removed, and a hand-held grease gun can be used to inject grease into the press-fitted grease cup 123 through the grease injection hole 112, which is fast and convenient. The nut is designed with an oil passage hole 124 and a press-fitted grease cup 123 installed, so that the lead screw 121 assembly can be greased without disassembling the electric cylinder 100.

[0078] Embodiment Seven

[0079] As Figure 1 and Figure 3 shown in the figure, the electric cylinder 100 further includes a second bearing seat 173 and a third seal 164. Specifically, the second bearing seat 173 is connected to the cylinder block 111, and the lead screw 121 passes through the second bearing seat 173. The lead screw 121 realizes relative rotation with the cylinder block 111 through the second bearing seat 173.

[0080] Further, the second bearing seat 173 is provided with a seventh placement groove 174, the third seal 164 is arranged in the seventh placement groove 174, and the third seal 164 abuts against the cylinder block 111. By providing the third seal 164, the sealing performance between the second bearing seat 173 and the cylinder block 111 can be improved, preventing rainwater, etc. from entering the cylinder block 111 to corrode important components.

[0081] Further, the electric cylinder 100 further includes a gearbox 180 and a motor 190. Among them, the gearbox 180 includes a box body 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 seal is provided at the connection between the box body 181 and the second bearing seat 173, which can improve the sealing performance between the second bearing seat 173 and the box body 181, preventing rainwater, etc. from entering the inside of the electric cylinder 100 to corrode important components. Further, the first gear 182 and the second gear 183 are both arranged inside the box body 181. The first gear 182 is connected to the lead screw 121, the second gear 183 is in transmission connection with the motor 190, and the first gear 182 meshes with the second gear 183. When the motor 190 works, the second gear 183 drives the first gear 182 to rotate, and the first gear 182 can make the lead screw 121 rotate. During the rotation of the lead screw 121, the nut 122 will drive the piston 125 and the push rod 127 to move relative to the cylinder block 111, thereby converting the rotational motion into a linear motion to meet the working requirements.

[0082] Example VIII

[0083] As Figure 4 shown, a construction machinery 200 provided by an embodiment of the present invention includes a frame body 210 and the electric cylinder 100 in any of the above embodiments, and the electric cylinder 100 is arranged on the frame body 210. For the electric cylinder 100 in the present invention, a sealing system (i.e., a sealing component) is designed to prevent external rainwater, etc. from entering the inside of the electric cylinder 100 body to corrode the cylinder body, improving the service life and reliability of the electric cylinder 100; a lubrication system (an oil storage tank 135 and guide members, etc.) is designed, and a self-lubricating material guide ring and a grease storage groove are used to ensure the lubrication performance in the cylinder, and it is possible to directly inject grease into the lead screw 121 assembly without disassembling the cylinder, avoiding insufficient lubrication and reducing the maintenance cost; a trapezoidal lead screw 121 assembly (i.e., a nut 122 and a lead screw 121) is designed, and the electric cylinder 100 can be automatically locked at any position, improving the safety of the electric cylinder 100. The electric cylinder 100 has the functions of sealing, lubrication and self-locking, can adapt to complex working conditions, and is beneficial to expanding the applicable range.

[0084] According to the embodiments of the electric cylinder and the construction machinery of the present invention, by providing a sealing component, the sealing performance between the guide sleeve and the cylinder barrel, and between the guide sleeve and the push rod can be improved, effectively preventing external rainwater or dust and other impurities from entering the inside of the electric cylinder, corroding important components such as the lead screw or gears, and being beneficial to improving the reliability and service life of the electric cylinder. In addition, after the electric cylinder reaches the specified position and the motor stops working, the lead screw and the nut can be in a self-locking state and remain relatively stationary, which is beneficial to improving the safety performance and greatly reducing the possibility of injuring the operator in the case of temporary power failure.

[0085] In the present invention, the terms "first", "second", "third" are only used for the purpose of description and cannot be understood as indicating or implying relative importance; the term "plurality" means two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation to the present invention.

[0087] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0088] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric cylinder (100), characterized in that, Comprising: A cylinder barrel (111); A lead screw (121) inserted through the cylinder barrel (111), the lead screw (121) being capable of rotating relative to the cylinder barrel (111); A lead nut (122) disposed within the cylinder barrel (111), the lead nut (122) being threadedly connected to the lead screw (121), and the frictional force between the threaded contact surfaces of the lead nut (122) and the lead screw (121) being capable of keeping the lead screw (121) and the lead nut (122) relatively stationary, so that the lead screw (121) and the lead nut (122) can be in a self-locking state; A guide sleeve (130) connected to the cylinder barrel (111), the guide sleeve (130) being relatively fixed to the cylinder barrel (111); A push rod (127) connected to the lead nut (122), the push rod (127) being inserted through the guide sleeve (130); A first sealing assembly (140) disposed between the guide sleeve (130) and the push rod (127); A second sealing assembly (150) disposed between the guide sleeve (130) and the cylinder barrel (111); A piston (125) disposed within the cylinder barrel (111), the piston (125) being connected to the lead nut (122), the outer wall of the piston (125) abutting against the inner wall of the cylinder barrel (111), and a fifth placement groove (126) being provided on the outer wall of the piston (125); A second guiding member (162) disposed within the fifth placement groove (126), the second guiding member (162) abutting against the inner wall of the cylinder barrel (111); The material of the second guiding member (162) is a self-lubricating material; The push rod (127) is provided with a receiving cavity (128), and the electric cylinder (100) further comprises: A first bearing seat (171) disposed within the receiving cavity (128), the lead screw (121) being inserted through the receiving cavity (128), the axis of the lead screw (121) coinciding with the axis of the push rod (127), the lead screw (121) being capable of relatively rotating with respect to the push rod (127) through the first bearing seat (171), and a sixth placement groove (172) being provided on the outer wall of the first bearing seat (171); A third guiding member (163) disposed within the sixth placement groove (172), the third guiding member (163) abutting against the wall of the receiving cavity (128); The material of the third guiding member (163) is a self-lubricating material; The lead nut (122) is provided with a press-fitted grease cup (123) and an oil passage hole (124), one end of the oil passage hole (124) being in communication with the press-fitted grease cup (123); A grease injection hole (112) is provided on the cylinder barrel (111), and a breather (113) is provided at the grease injection hole (112). When the push rod (127) extends, the oil passage hole (124) is in communication with the grease injection hole (112).

2. The electric cylinder (100) according to claim 1, characterized in that, On one side of the guide sleeve (130) close to the push rod (127), there are a first placement groove (131) and a second placement groove (132). The first placement groove (131) is located on the side of the second placement groove (132) away from the lead nut (122). The first sealing assembly (140) includes: A dust-proof ring (141) is arranged in the first placement groove (131), and the dust-proof ring (141) abuts against the push rod (127); A first seal (142) is arranged in the second placement groove (132), and the first seal (142) abuts against the push rod (127).

3. The electric cylinder (100) according to claim 1, characterized in that, On one side of the guide sleeve (130) close to the cylinder barrel (111), there is a third placement groove (133). The second sealing assembly (150) includes: A second seal (151) is arranged in the third placement groove (133), and the second seal (151) abuts against the cylinder barrel (111).

4. The electric cylinder (100) according to claim 2, characterized in that, On one side of the guide sleeve (130) close to the push rod (127), there are also an oil storage groove (135) and a fourth placement groove (134). Both the oil storage groove (135) and the fourth placement groove (134) are located on the side of the second placement groove (132) close to the lead nut (122). The oil storage groove (135) is located between the second placement groove (132) and the fourth placement groove (134). The electric cylinder (100) further includes: A first guiding member (161) is arranged in the fourth placement groove (134), and the first guiding member (161) abuts against the push rod (127).

5. The electric cylinder (100) according to claim 1, characterized in that, It further includes: A second bearing seat (173) is connected to the cylinder barrel (111). The lead screw (121) passes through the second bearing seat (173). The lead screw (121) rotates relative to the cylinder barrel (111) through the second bearing seat (173). The second bearing seat (173) is provided with a seventh placement groove (174); A third seal (164) is arranged in the seventh placement groove (174), and the third seal (164) abuts against the cylinder barrel (111).

6. The electric cylinder (100) according to claim 5, characterized in that, It further includes: A gearbox (180), including: A box body (181) is connected to the second bearing seat (173), A first gear (182) is arranged inside the box body (181), and the first gear (182) is connected to the lead screw (121); A second gear (183) is arranged inside the box body (181), and the second gear (183) meshes with the first gear (182); A motor (190) is in transmission connection with the second gear (183).

7. An engineering machinery (200), characterized in that, It includes: A frame body (210); The electric cylinder (100) according to any one of claims 1 to 6 is arranged on the frame body (210).

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