Double-nut high-frequency heavy-load bidirectional reciprocating electric cylinder

Abstract

The utility model discloses a double nut high frequency heavy load bidirectional reciprocating electric cylinder, including lead screw, left nut, right nut, left drive subassembly, right drive subassembly and box cover body, the left nut and right nut symmetrical suit in the lead screw, the left nut and right nut symmetry install in the box cover body, left drive subassembly and right drive subassembly symmetry install on the box cover body, left drive subassembly is used for driving left nut rotation, right drive subassembly is used for driving right nut rotation. The utility model discloses can balance bidirectional load, restrain high frequency wear and promote the electric cylinder structure of motion accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of electric cylinder technology, and in particular relates to a double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder. Background Technology

[0002] In the field of industrial automation, electric cylinders, as key linear actuators, are widely used in high-precision positioning, heavy-duty push-pull applications, and other scenarios. Traditional electric cylinders generally adopt a single-nut drive structure, that is, a single motor drives a lead screw or nut to rotate, converting rotational motion into linear motion. However, under high-frequency, heavy-duty bidirectional reciprocating motion conditions (such as driving reciprocating pumps), this structure has significant limitations: due to continuous unidirectional force, the contact surface between the nut and the lead screw is prone to rapid wear, leading to increased transmission clearance and decreased positioning accuracy; at the same time, single-point drive generates vibration due to inertial impact during high-speed reversal, affecting motion stability and even causing overheating failure. Existing improvement solutions (such as optimizing the lead screw material or increasing lubrication) can alleviate wear, but cannot fundamentally solve the problems of unbalanced bidirectional loads and high-frequency reversal stability, limiting the reliability and lifespan of electric cylinders under extreme conditions. Therefore, there is an urgent need for an electric cylinder structure that can balance bidirectional loads, suppress high-frequency wear, and improve motion accuracy. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder that can balance bidirectional load, suppress high-frequency wear and improve motion accuracy, in order to address the shortcomings of the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder, including a lead screw, a left nut, a right nut, a left drive assembly, a right drive assembly, and a housing cover; The left and right nuts are symmetrically mounted on the lead screw; The left and right nuts are symmetrically installed inside the box cover; The left drive assembly and the right drive assembly are symmetrically mounted on the box cover; The left drive assembly is used to drive the left nut to rotate; The right drive assembly is used to drive the right nut to rotate.

[0005] The aforementioned double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder has a left push rod and a right push rod symmetrically arranged at both ends of the lead screw.

[0006] The aforementioned double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder has its left push rod, right push rod, and lead screw all machined as a single unit. The aforementioned double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder has a left dustproof cylinder and a right dustproof cylinder symmetrically installed at both ends of the housing cover. The left dustproof cylinder and the right dustproof cylinder are sleeved on the outer sides of both ends of the lead screw, and the left push rod and the right push rod can extend out from the free ends of the left dustproof cylinder and the right dustproof cylinder, respectively.

[0007] The aforementioned double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder has dustproof rings at the free ends of both the left and right dustproof cylinders. The aforementioned double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder also includes a left limit guide block and a right limit guide block; The left limiting guide block is connected to the left end of the lead screw and is used to limit the rotation of the left end of the lead screw. The left dustproof cylinder is equipped with a guide rail for the linear sliding of the left limiting guide block; The right limiting guide block is connected to the right end of the lead screw and is used to limit the rotation of the right end of the lead screw. The right dustproof cylinder is equipped with a guide rail for the linear sliding of the right limit guide block.

[0008] The aforementioned double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder, wherein both the left drive assembly and the right drive assembly include a motor and a multi-stage gear pair; The multi-stage gear pair includes a first gear, a second gear, a third gear, and a fourth gear; The first gear is mounted on the motor shaft, and the second and third gears are mounted on the same synchronous shaft; the synchronous shaft is mounted inside the housing. The fourth gear of the left drive assembly is mounted on the outer ring side of the left nut and is used to drive the left nut to rotate; The fourth gear of the right drive assembly is installed on the outer ring side of the right nut and is used to drive the right nut to rotate. The first gear and the second gear mesh, and the third gear and the fourth gear mesh.

[0009] The aforementioned double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder has a left motor cover and a right motor cover symmetrically installed at both ends of the housing cover.

[0010] The aforementioned double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder has multiple heat dissipation fins on the outer sides of both the left and right dustproof cylinders.

[0011] In the aforementioned dual-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder, both the left and right nuts are mounted inside the housing via thrust bearings located at their respective ends. This utility model has the following advantages compared with the prior art: 1. By symmetrically mounting the left and right nuts onto the lead screw and controlling them separately by independent left and right drive components, a balanced load distribution for bidirectional motion is achieved. During high-frequency reciprocating motion, the bidirectional load force is evenly distributed to the two nuts, avoiding the problem of localized wear aggravation caused by continuous force on a single point, significantly extending the service life of the lead screw pair, while reducing transmission backlash caused by wear and maintaining high-precision positioning capability.

[0012] 2. The left and right nuts and drive components are symmetrically installed inside the housing, forming an integrated rigid structure. This design significantly improves the overall rigidity of the system, effectively suppressing deformation and vibration under heavy loads. In particular, it reduces vibration and noise caused by inertial impact during high-speed reversal, ensuring smooth movement and thus solving the problem of accuracy reduction caused by insufficient rigidity in traditional split-type supports.

[0013] 3. The left and right drive components independently drive their respective nuts, supporting rapid response and precise coordination of bidirectional motion. Under frequent reversing conditions (such as high-frequency reciprocating strokes), the dual drive components can synchronously or asynchronously adjust the rotational speed and direction of the nuts to achieve instantaneous torque balance. This avoids the delay and jitter during reversing in a single drive system, significantly improving motion stability and dynamic response accuracy, and meeting the stringent requirements for bidirectional control reliability in heavy-load scenarios.

[0014] 4. The double-nut structure reduces the temperature rise rate of a single nut by sharing the load. Combined with the closed design of the cover, it can integrate forced heat dissipation or lubrication channels (such as centralized lubrication through the oil injection port reserved in the cover), further reducing frictional heat accumulation and preventing material fatigue and precision failure caused by overheating. It solves the overheating and jamming problem that is common in traditional single-nut systems during long-term high-frequency operation.

[0015] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is the left view of the present invention.

[0018] Figure 3 for Figure 2 AA sectional view.

[0019] Figure 4 for Figure 3 BB cross-sectional view.

[0020] Figure 5 This is a schematic diagram of the structure of this utility model after removing the box cover and motor cover.

[0021] Explanation of reference numerals in the attached figures: Detailed Implementation

[0022] like Figure 1-5 As shown, a dual-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder includes a lead screw 1, a left nut 2, a right nut 3, a left drive assembly, a right drive assembly, and a housing cover 6. The left nut 2 and the right nut 3 are symmetrically mounted on the lead screw 1; The left nut 2 and the right nut 3 are symmetrically installed inside the box cover 6; The left drive assembly and the right drive assembly are symmetrically mounted on the box cover 6; The left drive assembly is used to drive the left nut 2 to rotate; The right drive assembly is used to drive the right nut 3 to rotate.

[0023] It should be noted that, through the symmetrical arrangement of the double nuts, the left and right nuts 3 are symmetrically mounted on the lead screw 1, and the left and right drive components are symmetrically installed inside the housing 6, allowing each drive component to independently drive the corresponding nut to rotate. This layout fundamentally changes the force distribution mode of the traditional single-nut drive, achieving independent control of bidirectional motion through a symmetrical structure. This effectively avoids the inertial impact and backlash problems of unidirectional drive, laying the structural foundation for high-frequency response.

[0024] In high-frequency, heavy-load scenarios, this combination of features exhibits significant advantages: independent control allows the dual-side driving force to be distributed in real time according to load changes, avoiding structural deformation caused by unilateral overload in traditional asymmetrical layouts; the integrated design ensures the synchronization of movement of each component through rigid frame constraints, reducing the impact of vibration on positioning accuracy.

[0025] In summary, by organically combining the symmetrical layout of the double nuts, independent drive control, and integrated design of the housing body 6, the problems of load concentration, spatial interference, and response lag in traditional electric cylinders under high-frequency heavy-load scenarios are systematically solved, forming a technical solution with significant innovation.

[0026] In this embodiment, the two ends of the lead screw 1 are symmetrically provided with a left push rod 4 and a right push rod 5.

[0027] In this embodiment, the left push rod 4, the right push rod 5, and the lead screw 1 are machined as a single unit.

[0028] The integrated molding structure of the push rod and lead screw 1 fundamentally eliminates the transmission error caused by assembly gaps in traditional split connections, significantly improving the transmission rigidity of the system. Simultaneously, the symmetrical arrangement ensures uniform force distribution during bidirectional force application (pushing on one side and pulling on the other), effectively avoiding eccentric load problems caused by unilateral force application, and providing a structural foundation for high-frequency, heavy-duty bidirectional reciprocating motion.

[0029] In this embodiment, a left dustproof cylinder 7 and a right dustproof cylinder 8 are symmetrically installed at both ends of the box cover 6. The left dustproof cylinder 7 and the right dustproof cylinder 8 are sleeved on the outer sides of both ends of the lead screw 1. The left push rod 4 and the right push rod 5 can extend from the free ends of the left dustproof cylinder 7 and the right dustproof cylinder 8, respectively.

[0030] In this embodiment, dustproof rings 9 are provided at the free ends of both the left dustproof cylinder 7 and the right dustproof cylinder 8.

[0031] The dustproof system employs a two-tiered protection design with a dustproof cylinder and a dustproof ring 9. The polyurethane dustproof ring 9 is installed at the port of the dustproof cylinder via an interference fit, forming the first sealing barrier. This combination of material selection and fitting method utilizes the elastic deformation of the polyurethane material to compensate for gaps, while ensuring static sealing performance through the interference fit. The dustproof cylinder serves as the second barrier, using its overall structural design to prevent the intrusion of large particulate contaminants, while also providing rigid support for the dustproof ring 9. Together, these two elements effectively isolate external dust, oil, and other contaminants, preventing them from entering core transmission components such as the lead screw 1 and nut pair.

[0032] In this embodiment, a left limiting guide block 10 and a right limiting guide block 11 are also included; The left limiting guide block 10 is connected to the left end of the lead screw 1 and is used to limit the rotation of the left end of the lead screw 1. The left dustproof cylinder 7 is provided with a guide rail 20 for the linear sliding of the left limiting guide block 10; The right limiting guide block 11 is connected to the right end of the lead screw 1 and is used to limit the rotation of the right end of the lead screw 1. The right dustproof cylinder 8 is equipped with a guide rail 20 for the linear sliding of the right limit guide block 11.

[0033] The synergistic design of limit guidance and dust protection is the core innovation in resolving the contradiction between pollution protection and guidance accuracy under heavy-load conditions. This design, through the organic combination of a two-stage protective barrier and a high-precision guidance mechanism, achieves a dual improvement in environmental adaptability and motion accuracy, breaking through the performance bottleneck of traditional single structures.

[0034] In this embodiment, both the left drive assembly and the right drive assembly include a motor 12 and a multi-stage gear pair; The multi-stage gear pair includes a first gear 13, a second gear 14, a third gear 15, and a fourth gear 16; The first gear 13 is mounted on the rotating shaft of the motor 12, and the second gear 14 and the third gear 15 are mounted on the same synchronous shaft 17; the synchronous shaft 17 is installed inside the housing 6. The fourth gear 16 of the left drive assembly is mounted on the outer ring side of the left nut 2 and is used to drive the left nut 2 to rotate. The fourth gear 16 of the right drive assembly is installed on the outer ring side of the right nut 3 and is used to drive the right nut 3 to rotate. The first gear 13 and the second gear 14 mesh, and the third gear 15 and the fourth gear 16 mesh.

[0035] Multi-stage gear pairs are the core component for achieving efficient power transmission in dual-nut high-frequency heavy-duty bidirectional reciprocating electric cylinders. Their optimized configuration directly determines the equipment's heavy-duty capacity and dynamic response characteristics. The four-gear transmission structure effectively resolves the contradiction between the high-speed motor 12 and the demand for high torque output through progressive speed reduction and torque increase, while precision design ensures transmission accuracy and system stability.

[0036] In this embodiment, a left motor cover and a right motor cover are symmetrically installed at both ends of the box cover 6.

[0037] Both the left and right motor covers are metal covers, which shield the motors from interference (such as inverter harmonics) and ensure the stability of the encoder signal. In this embodiment, multiple heat sinks 18 are provided on the outer sides of both the left dustproof cylinder 7 and the right dustproof cylinder 8.

[0038] In this embodiment, the left nut 2 and the right nut 3 are both installed inside the box cover 6 through thrust bearings 19 provided at their respective ends.

[0039] The thrust bearing 19 directly bears the axial load of the nut (instead of the lead screw 1), so that the lead screw 1 is only subjected to torque, thus solving the problem of lead screw 1 bending in traditional electric cylinders.

[0040] In this embodiment, an oil lubrication system is provided on the outside of the cover body 6. The oil lubrication system includes a circulation pump 21, multiple oil outlet pipes 22, and at least one oil return pipe 23. One end of the oil return pipe 23 is connected to the oil collection pool at the bottom of the cover body 6, and the other end is connected to the circulation pump 21. The oil outlet of the circulation pump 21 is connected to multiple oil outlet pipes 22, and the oil outlets of the multiple oil outlet pipes 22 are respectively used to spray oil lubrication onto multiple thrust bearings 19.

[0041] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder, characterized in that, Includes lead screw, left nut, right nut, left drive assembly, right drive assembly, and housing cover; The left and right nuts are symmetrically mounted on the lead screw; The left and right nuts are symmetrically installed inside the box cover; The left drive assembly and the right drive assembly are symmetrically mounted on the box cover; The left drive assembly is used to drive the left nut to rotate; The right drive assembly is used to drive the right nut to rotate.

2. A double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder according to claim 1, characterized in that, The lead screw is symmetrically equipped with a left push rod and a right push rod at both ends.

3. A double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder according to claim 2, characterized in that, The left push rod, right push rod, and lead screw are machined as a single unit.

4. A double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder according to claim 2, characterized in that, The left and right dustproof cylinders are symmetrically installed at both ends of the box cover. The left and right dustproof cylinders are sleeved on the outer sides of both ends of the lead screw. The left push rod and the right push rod can extend from the free ends of the left and right dustproof cylinders, respectively.

5. A double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder according to claim 4, characterized in that, Dustproof rings are provided at the free ends of both the left and right dustproof cylinders.

6. A double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder according to claim 4, characterized in that, It also includes a left limit guide block and a right limit guide block; The left limiting guide block is connected to the left end of the lead screw and is used to limit the rotation of the left end of the lead screw. The left dustproof cylinder is equipped with a guide rail for the linear sliding of the left limiting guide block; The right limiting guide block is connected to the right end of the lead screw and is used to limit the rotation of the right end of the lead screw. The right dustproof cylinder is equipped with a guide rail for the linear sliding of the right limit guide block.

7. A double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder according to claim 4, characterized in that, Both the left drive assembly and the right drive assembly include a motor and a multi-stage gear pair; The multi-stage gear pair includes a first gear, a second gear, a third gear, and a fourth gear; The first gear is mounted on the motor shaft, and the second and third gears are mounted on the same synchronous shaft; the synchronous shaft is mounted inside the housing. The fourth gear of the left drive assembly is mounted on the outer ring side of the left nut and is used to drive the left nut to rotate; The fourth gear of the right drive assembly is installed on the outer ring side of the right nut and is used to drive the right nut to rotate. The first gear and the second gear mesh, and the third gear and the fourth gear mesh.

8. A double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder according to claim 7, characterized in that, The left motor cover and the right motor cover are symmetrically installed at both ends of the box cover.

9. A double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder according to claim 4, characterized in that, Multiple heat sinks are provided on the outer sides of both the left and right dustproof cylinders.

10. A double-nut high-frequency heavy-duty bidirectional reciprocating electric cylinder according to claim 1, characterized in that, Both the left and right nuts are mounted inside the housing via thrust bearings located at their respective ends.

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