Mechanical locking hydraulic cylinder

Abstract

Provided is a mechanical locking hydraulic cylinder, comprising: a cylinder barrel assembly (1), comprising a motor mounting plate (101), a cylinder barrel (102), a cylinder bottom (103), a lead screw rotary seal (104), a support bearing pair (105), a sealing ring (106), a lead screw adapter sleeve (107) and a bearing oil cylinder (108); a piston assembly (2), comprising a piston (201), a first support ring (202), a piston seal (203) and a compression nut (204); a guide sleeve assembly (3), comprising a guide sleeve (301), a guide sleeve seal (302), a guide sleeve retaining ring (303), a guide sleeve stop ring (304), a second support ring (305), a piston rod seal (306) and a dustproof ring (307); and a driving and locking assembly (4), comprising a hydraulic motor (401), a fixing pin (402), a trapezoidal compression nut (403), a locking lead screw (404), and a locking nut (405). A piston rod (5) passes through the guide sleeve (301) and the piston (201) of the piston assembly (2) so as to be fixed, and is limited on the basis of the cylinder barrel (102) and the guide sleeve (301). Oil supply at an oil inlet and an oil outlet of the hydraulic cylinder drives the piston rod (5) to perform axial extension and retraction movement, realizing the locking of the hydraulic cylinder at any position without the need for an additional oil source. The hydraulic cylinder has low structural complexity and good reliability, and can realize movement, hovering and locking at any position.

Description

A mechanical locking hydraulic cylinder Technical Field

[0001] This application relates to the field of hydraulic transmission technology, specifically to a mechanical locking hydraulic cylinder. Background Technology

[0002] Currently, most hydraulic cylinders used in various hydraulic leveling and tilting equipment employ hydraulic locks for fastening. Due to the inherent characteristics of hydraulic locks and hydraulic cylinders, they cannot achieve long-term fastening. Other forms of mechanical locking hydraulic cylinders require an unlocking oil source, which increases the complexity of the system. During unlocking, there is rigid friction between the cylinder or piston rod and the locking device, which can easily cause surface failure, resulting in low reliability. Furthermore, the parts require high machining precision, making the hydraulic cylinder very expensive. Summary of the Invention

[0003] To address the problems existing in the prior art, this application provides a mechanical locking hydraulic cylinder and system to solve the technical problems that most hydraulic cylinders in the prior art use hydraulic locks for locking. Due to the inherent characteristics of hydraulic locks and hydraulic cylinders, long-term locking function cannot be achieved. Other forms of mechanical locking hydraulic cylinders require an unlocking oil source, which increases the complexity of the system. During unlocking, there is rigid friction between the cylinder or piston rod and the locking device, which can easily cause surface failure, resulting in low reliability. In addition, the parts require high machining precision, and the hydraulic cylinder is very expensive.

[0004] This application provides a mechanical locking hydraulic cylinder, including a cylinder assembly, a piston assembly, a guide sleeve assembly, a drive locking assembly, and a piston rod; the cylinder assembly includes a motor mounting plate, a cylinder barrel, a cylinder bottom, a lead screw rotary seal, a support bearing pair, a sealing ring, a lead screw adapter sleeve, and a bearing cylinder; the piston assembly includes a piston, a first support ring, a piston seal, and a clamping nut; the guide sleeve assembly includes a guide sleeve, a guide sleeve seal, a guide sleeve retaining ring, a guide sleeve retaining ring, a second support ring, a piston rod seal, and a dustproof ring; the drive locking assembly includes a hydraulic motor, a fixing pin, a trapezoidal clamping nut, a locking lead screw, and a locking nut; one end of the cylinder bottom is connected to the cylinder barrel through the sealing ring, the cylinder bottom has a support bearing pair and a bearing cylinder connected to the support bearing pair inside, the other end of the cylinder bottom is connected to the motor mounting plate, and the lead screw adapter sleeve sequentially passes through... The motor mounting plate and cylinder bottom are connected to the support bearing assembly. The screw rotation seal is located on the periphery of the screw adapter sleeve. The piston is located at one end of the cylinder near the bearing cylinder, and its periphery is provided with a first support ring and a piston seal. A clamping nut is connected inside the piston. The guide sleeve is located at the other end of the cylinder, and its periphery is provided with a guide sleeve seal, a guide sleeve retaining ring, and a guide sleeve retaining ring. Its interior is provided with a second support ring, a piston rod seal, and a dustproof ring. The locking screw passes through the trapezoidal clamping nut to fix the output shaft of the hydraulic motor and is connected to the cylinder through the fixing pin. The hydraulic motor is connected to the cylinder bottom through the motor mounting plate. The locking nut fixes the piston rod. The piston rod passes through the guide sleeve and the piston in sequence and is fixedly connected to the locking screw through the locking nut.

[0005] In one embodiment, the locking screw passes through the trapezoidal clamping nut to fix the output shaft of the hydraulic motor, including: the output shaft of the hydraulic motor is connected to the locking screw via a coupling or key.

[0006] In one embodiment, the locking screw passes through the trapezoidal clamping nut to fix the output shaft of the hydraulic motor, and further includes: the output shaft of the hydraulic motor is connected to the locking screw via a gear or belt.

[0007] In one embodiment, the locking screw is fixedly connected by the locking nut, comprising: the locking screw and the locking nut forming a kinematic pair, wherein the helix angle is smaller than the friction angle of the locking screw.

[0008] In one embodiment, the locking screw passes through the trapezoidal clamping nut to fix the output shaft of the hydraulic motor, and further includes: the locking screw being fixedly connected to the support bearing pair.

[0009] A mechanical locking hydraulic cylinder system includes an oil filter, a hydraulic pump, a solenoid directional valve, a relief valve, an oil tank, and the mechanical locking hydraulic cylinder described in any one of the above.

[0010] Compared to existing technologies, this application:

[0011] The piston rod is fixed by passing through the guide sleeve and piston of the piston assembly, and is limited by the cylinder and guide sleeve. The oil supply from the inlet and outlet of the hydraulic cylinder drives the piston rod to perform axial extension and retraction, realizing the locking of the hydraulic cylinder at any position without the need for an additional oil source. This hydraulic cylinder has low structural complexity and high reliability, and can achieve arbitrary position movement, hovering and locking. It solves the technical problems of existing hydraulic cylinders, most of which use hydraulic locks for locking. Due to the inherent characteristics of hydraulic locks and hydraulic cylinders, they cannot achieve long-term locking function. Other forms of mechanical locking hydraulic cylinders require an unlocking oil source, which increases the complexity of the system. When unlocking, there is rigid friction between the cylinder or piston rod and the locking device, which can easily cause surface failure, resulting in low reliability. In addition, the parts require high machining precision, and the hydraulic cylinder is very expensive. Attached Figure Description

[0012] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 is a schematic diagram of the overall structure of the mechanical locking hydraulic cylinder disclosed in some embodiments of this application;

[0015] Figure 2 is a schematic diagram of the cylinder assembly structure disclosed in some embodiments of this application;

[0016] Figure 3 is a schematic diagram of the piston assembly structure disclosed in some embodiments of this application;

[0017] Figure 4 is a schematic diagram of the guide sleeve assembly structure disclosed in some embodiments of this application;

[0018] Figure 5 is a schematic diagram of the drive locking component structure disclosed in some embodiments of this application;

[0019] Figure 6 is a schematic diagram of the mechanical principle of the hydraulic cylinder disclosed in some embodiments of this application.

[0020] Explanation of reference numerals in the attached drawings: 100. Mechanical locking hydraulic cylinder; 1. Cylinder assembly; 101. Motor mounting plate; 102. Cylinder barrel; 103. Cylinder bottom; 104. Screw rotary seal; 105. Support bearing pair; 106. Sealing ring; 107. Screw adapter sleeve; 108. Bearing cylinder; 2. Piston assembly; 201. Piston; 202. First support ring; 203. Piston seal; 204. Compression nut; 3. Guide sleeve assembly; 301. Guide sleeve; 3 02. Guide sleeve seal; 303. Guide sleeve retaining ring; 304. Guide sleeve retaining ring; 305. Second support ring; 306. Piston rod seal; 307. Dustproof ring; 4. Drive locking assembly; 401. Hydraulic motor; 402. Fixing pin; 403. Trapezoidal clamping nut; 404. Locking screw; 405. Locking nut; 5. Piston rod; 6. Oil filter; 7. Hydraulic pump; 8. Solenoid directional valve; 9. Relief valve; 10. Oil tank. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other implementation cases obtained by those skilled in the art without creative effort are within the scope of protection of this application. Functional units with the same reference numerals in the examples of this application have the same and similar structures and functions.

[0022] Referring to Figure 1, this application provides a mechanical locking hydraulic cylinder 100, including a cylinder assembly 1, a piston assembly 2, a guide sleeve assembly 3, a drive locking assembly 4, and a piston rod 5; the cylinder assembly 1 includes a motor mounting plate 101, a cylinder 102, a cylinder bottom 103, a lead screw rotary seal 104, a support bearing pair 105, a sealing ring 106, a lead screw adapter sleeve 107, and a bearing cylinder 108; the piston assembly 2 includes a piston 201, a first support ring 202, a piston seal 203, and a clamping nut; the guide sleeve assembly 3 includes a guide sleeve 301 and a guide sleeve seal 301. 2. Guide sleeve retaining ring 303, guide sleeve retaining ring 304, second support ring 305, piston rod seal 306, and dustproof ring 307; drive locking assembly 4 includes hydraulic motor 401, fixing pin 402, trapezoidal clamping nut 403, locking screw 404, and locking nut 405; one end of cylinder bottom 103 is connected to cylinder barrel 102 through sealing ring 106, the inside of cylinder bottom 103 is provided with support bearing pair 105 and bearing cylinder 108 connected to support bearing pair 105, the other end of cylinder bottom 103 is connected to motor mounting plate 101, and screw adapter sleeve 107 is sequentially... A through-mount plate 101 and cylinder bottom 103 connects to a support bearing pair 105. A screw rotary seal 104 is located on the periphery of the screw adapter sleeve 107. A piston 201 is located at one end inside the cylinder 102 near the bearing cylinder 108, as shown in Figure 3. A first support ring 202 and a piston seal 203 are respectively provided on the outer periphery of the piston 201. A clamping nut 204 is connected inside the piston 201, as shown in Figure 4. A guide sleeve 301 is located at the other end inside the cylinder 102. A guide sleeve seal 302 and a guide sleeve retaining ring are respectively provided around the outer periphery of the guide sleeve 301. 303 and guide sleeve retaining ring 304, the guide sleeve 301 is internally fitted with a second support ring 305, piston rod seal 306 and dustproof ring 307, as shown in Figure 5, the locking screw 404 passes through the trapezoidal clamping nut 403 to fix the output shaft of the hydraulic motor 401, and is connected to the cylinder 102 through the fixing pin 402. The hydraulic motor 401 is connected to the cylinder bottom 103 through the motor mounting plate 101. The locking nut 405 is fixedly connected to the piston rod 5. The piston rod 5 passes through the guide sleeve 301 and piston 201 in sequence, and is fixedly connected to the locking screw 404 through the locking nut 405.

[0023] Referring to Figures 2-5, in some embodiments, the drive locking assembly 4 is mainly used to provide additional pushing / pulling force when the mechanical locking hydraulic cylinder 100 moves; and automatically provides sufficient mechanical locking force when the mechanical locking hydraulic cylinder 100 stops moving. The cylinder assembly 1, piston assembly 2, guide sleeve assembly 3, and drive locking assembly 4 are all coaxially mounted. When pressure oil is input in the same direction, the movement direction of the cylinder assembly 1, piston assembly 2, guide sleeve assembly 3, and drive locking assembly 4 is consistent with the movement direction of the locking nut 405 in the drive locking assembly 4.

[0024] Specifically, referring to Figure 1, the piston rod 5 is connected to the piston assembly 2, the guide sleeve assembly 3, and the cylinder assembly 1, respectively. The piston rod 5 passes through the guide sleeve 301 and the piston 201 in sequence, and is fixedly connected to the locking screw 404 by the locking nut 405. Since the guide sleeve 301 and the cylinder 102 limit the piston rod 5, the hydraulic cylinder inlet and outlet oil supply drives the piston rod 5 to perform axial extension and retraction. At the same time, when the hydraulic motor 401 drives the locking screw 404 to rotate, it drives the locking nut 405 to perform back-and-forth movement along the axis.

[0025] Referring to Figure 6, in use, the hydraulic motor 401 is also connected to the oil filter 6, hydraulic pump 7, solenoid directional valve 8, relief valve 9, and oil tank 10. When the pressure oil from the hydraulic pump 7 drives the hydraulic cylinder to move outward (inward), the locking screw 404, driven by the hydraulic motor 401, pushes the locking nut 405 to move outward (inward) synchronously, at a speed slightly faster than the hydraulic cylinder's operating speed. This provides an additional pushing (pulling) force, and the mechanical load moves simultaneously under the drive of the hydraulic cylinder. When the pushing (pulling) force provided by the pressure oil is insufficient to drive the mechanical load, the locking screw 404 and locking nut 405 self-lock. Since the locking screw 404 is axially fixed, it cannot drive the locking nut 405 to move axially, and the piston rod 5, which is fixed integrally with the locking nut 405, also locks synchronously. This mechanical locking hydraulic cylinder 100 can extend automatically and self-lock at any position, increasing the hydraulic cylinder's load capacity. It has a wide range of applications and a reliable structure.

[0026] In another embodiment, the hydraulic motor 401 and the locking screw 404 can be coaxially connected, and the output shaft of the hydraulic motor 401 and the locking screw 404 can be connected by a coupling or a key.

[0027] In another embodiment, the hydraulic motor 401 and the locking screw 404 can be coaxially connected, and the output shaft of the hydraulic motor 401 is connected to the locking screw 404 via gears or belts.

[0028] In another embodiment, the locking screw 404 and the locking nut 405 are threaded together to form a kinematic pair (also called a threaded pair). The helix angle of the threaded pair is smaller than the friction angle of the threaded pair, which can achieve effective self-locking.

[0029] In another embodiment, the locking screw 404 is fixedly connected to the support bearing assembly 105 to ensure that the locking screw 404 can rotate freely while also being able to withstand a sufficiently large axial push / pull force.

[0030] In this application, the piston rod 5 is fixed by passing through the guide sleeve 301 of the guide sleeve assembly 3 and the piston 201 of the piston assembly 2, and is limited by the cylinder 102 and the guide sleeve 301. The hydraulic cylinder inlet and outlet oil supply drives the piston rod 5 to perform axial extension and retraction movement, realizing the locking of the hydraulic cylinder at any position without the need for an additional oil source. The hydraulic cylinder has low structural complexity, good reliability, and can realize arbitrary position movement, hovering and locking.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes said element.

[0032] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A mechanical locking hydraulic cylinder, characterized in that, include: Piston rod; The cylinder assembly includes a motor mounting plate, cylinder barrel, cylinder bottom, lead screw rotary seal, support bearing pair, sealing ring, lead screw adapter sleeve, and bearing cylinder; Piston assembly, including piston, first support ring, piston seal and clamping nut; The guide sleeve assembly includes a guide sleeve, a guide sleeve seal, a guide sleeve retaining ring, a guide sleeve retaining ring, a second support ring, a piston rod seal, and a dustproof ring; The drive locking assembly includes a hydraulic motor, a retaining pin, a trapezoidal clamping nut, a locking screw, and a locking nut; One end of the cylinder bottom is connected to the cylinder barrel via the sealing ring. The cylinder bottom contains the supporting bearing assembly and the bearing cylinder connecting to the supporting bearing assembly. The other end of the cylinder bottom is connected to the motor mounting plate. The lead screw adapter sleeve passes through the motor mounting plate and the cylinder bottom, connecting to the supporting bearing assembly. The lead screw rotary seal is located on the periphery of the lead screw adapter sleeve. The piston is located near the bearing cylinder at one end inside the cylinder barrel. The piston periphery is provided with the first support ring and the piston seal. The piston interior is connected to the clamping nut. The guide sleeve is located on... At the other end of the cylinder, the outer periphery of the guide sleeve is respectively provided with a guide sleeve seal, a guide sleeve retaining ring, and a guide sleeve retaining ring. Inside the guide sleeve, the second support ring, the piston rod seal, and the dustproof ring are provided. The locking screw passes through the trapezoidal clamping nut to fix the output shaft of the hydraulic motor and is connected to the cylinder through the fixing pin. The hydraulic motor is connected to the cylinder bottom through the motor mounting plate. The locking nut is fixedly connected to the piston rod. The piston rod passes through the guide sleeve and the piston in sequence and is fixedly connected to the locking screw through the locking nut.

2. The mechanical locking hydraulic cylinder as described in claim 1, characterized in that, The locking screw passes through the trapezoidal clamping nut to fix the output shaft of the hydraulic motor, including: the output shaft of the hydraulic motor is connected to the locking screw via a coupling or key.

3. The mechanical locking hydraulic cylinder as described in claim 1, characterized in that, The locking screw passes through the trapezoidal clamping nut to fix the output shaft of the hydraulic motor, and further includes: the output shaft of the hydraulic motor is connected to the locking screw via a gear or belt.

4. The mechanical locking hydraulic cylinder as described in claim 1, characterized in that, The method of fixing the locking screw through the locking nut includes: the locking screw and the locking nut forming a kinematic pair, the helix angle of which is smaller than the friction angle of the locking screw.

5. The mechanical locking hydraulic cylinder as described in claim 1, characterized in that, The locking screw passes through the trapezoidal clamping nut to fix the output shaft of the hydraulic motor, and also includes: the locking screw is fixedly connected to the support bearing pair.

6. A mechanical locking hydraulic cylinder system, characterized in that, It includes an oil filter, a hydraulic pump, a solenoid directional valve, a relief valve, an oil tank, and a mechanical locking hydraulic cylinder as described in any one of claims 1 to 5.

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