Mechanical locking hydraulic cylinder

Abstract

The invention provides a mechanical locking hydraulic cylinder which comprises a cylinder barrel assembly, a motor mounting plate, a cylinder barrel, a cylinder bottom, a lead screw rotating seal, a supporting bearing pair, a sealing ring, a lead screw reducing sleeve and a bearing oil cylinder. The piston assembly comprises a piston, a first supporting ring, a piston seal and a compression nut; the guide sleeve assembly comprises a guide sleeve, a guide sleeve seal, a guide sleeve clamping ring, a guide sleeve check ring, a second supporting ring, a piston rod seal and a dustproof ring. The driving locking assembly comprises a hydraulic motor, a fixing pin, a trapezoidal pressing nut, a locking lead screw and a locking nut. The piston rod penetrates through the guide sleeve of the piston assembly to be fixed to the piston, limiting is achieved based on the cylinder barrel and the guide sleeve, an oil inlet and an oil outlet of the hydraulic cylinder supply oil to drive the piston rod to do axial telescopic motion, the hydraulic cylinder is locked at any position without an additional oil source, and the electric cylinder is low in structural complexity, good in reliability and convenient to use. Movement, hovering and locking at any position can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic transmission, and in particular to a mechanical locking hydraulic cylinder. Background Art

[0002] At present, in various types of hydraulic leveling and flipping equipment, most of the various types of hydraulic cylinders used are locked by hydraulic locks. Due to the inherent characteristics of hydraulic locks and hydraulic cylinders, long-term locking functions cannot be achieved. Other forms of mechanical locking hydraulic cylinders require an oil source for unlocking, which increases the complexity of the system. When unlocking, there is rigid scraping between the cylinder or piston rod and the locker, which can easily cause surface failure, low reliability, high parts processing accuracy requirements, and high hydraulic cylinder costs. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a mechanical locking hydraulic cylinder and system to solve the technical problems that various types of hydraulic cylinders in the prior art are mostly locked by hydraulic locking. Due to the inherent characteristics of the hydraulic lock and the hydraulic cylinder, the 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. When unlocking, there is rigid scraping between the cylinder or piston rod and the locker, which can easily cause surface failure, low reliability, high requirements on parts processing accuracy, and high cost of the hydraulic cylinder.

[0004] The present invention provides a mechanical locking hydraulic cylinder, comprising:

[0005] Cylinder assembly, piston assembly, guide sleeve assembly, drive locking assembly and piston rod;

[0006] Cylinder assembly, including motor mounting plate, cylinder, cylinder bottom, screw rotating seal, support bearing pair, sealing ring, screw adapter sleeve and bearing oil cylinder;

[0007] A piston assembly, comprising a piston, a first support ring, a piston seal and a compression nut;

[0008] A guide sleeve assembly, including a guide sleeve, a guide sleeve seal, a guide sleeve clamp ring, a guide sleeve retaining ring, a second support ring, a piston rod seal, and a dust ring;

[0009] A driving locking assembly, including a hydraulic motor, a fixing pin, a trapezoidal compression nut, a locking screw, and a locking nut;

[0010] One end of the cylinder bottom is connected to the cylinder barrel through the sealing ring, and a support bearing pair and a bearing oil cylinder connected to the support bearing pair are arranged inside the cylinder bottom. The other end of the cylinder bottom is connected to the motor mounting plate, and the screw rod adapter sleeve sequentially passes through the motor mounting plate and the cylinder bottom to connect the support bearing pair. The screw rod rotary seal is arranged on the circumference of the screw rod adapter sleeve, and the piston is close to the bearing oil cylinder and arranged at one end inside the cylinder barrel, and a first support ring and a piston seal are arranged on its circumference, and a compression nut is arranged on the internal connection of the piston. The guide sleeve is arranged at the other end inside the cylinder barrel, and a guide sleeve seal, a guide sleeve clamp ring and a guide sleeve retaining ring are arranged on its circumference, and a second support ring, a piston rod seal and a dust ring are arranged inside the piston. The locking screw passes through the trapezoidal compression nut to fix the output shaft of the hydraulic motor, and is connected to the cylinder barrel through the fixing pin. The hydraulic motor is connected to the cylinder bottom through the motor mounting plate, and the locking nut is fixedly connected to the piston rod. The piston rod sequentially passes through the guide sleeve and the piston, and is fixedly connected to the locking screw through the locking nut.

[0011] Optionally, the locking screw passes through the trapezoidal compression nut to fix the output shaft of the hydraulic motor, comprising:

[0012] The output shaft of the hydraulic motor is connected to the locking screw through a coupling or a key.

[0013] Optionally, the locking screw passes through the trapezoidal compression nut to fix the output shaft of the hydraulic motor, and further comprises:

[0014] The output shaft of the hydraulic motor is connected to the locking screw through a gear or a belt.

[0015] Optionally, the fixing and connecting the locking screw rod by the locking nut comprises:

[0016] The locking screw and the locking nut form a kinematic pair, and the helix angle of the kinematic pair is smaller than the friction angle of the locking screw.

[0017] Optionally, the locking screw passes through the trapezoidal compression nut to fix the output shaft of the hydraulic motor, and further comprises:

[0018] The locking screw is fixedly connected to the support bearing pair.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The piston rod is fixed through the guide sleeve and piston of the piston assembly, and is limited based on the cylinder barrel and the guide sleeve. The hydraulic cylinder's oil inlet and outlet ports supply oil to drive the piston rod to perform axial telescopic movement, thereby realizing locking the hydraulic cylinder at any position without the need for an additional oil source. The electric cylinder has a low structural complexity and good reliability, and can achieve movement, hovering and locking at any position. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the cylinder assembly of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the piston assembly of the present invention;

[0026] Figure 4 It is a schematic structural diagram of the guide sleeve assembly of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the drive locking assembly of the present invention;

[0028] Figure 6 It is a schematic diagram of the mechanical principle of the hydraulic cylinder of the present invention.

[0029] Description of reference numerals:

[0030] 1. Cylinder assembly; 101. Motor mounting plate; 102. Cylinder; 103. Cylinder bottom; 104. Screw rotary seal; 105. Support bearing pair; 106. Seal 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; 302. Guide sleeve Seal; 303, guide sleeve clamp ring; 304, guide sleeve retaining ring; 305, second support ring; 306, piston rod seal; 307, dust 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 reversing valve; 9, overflow valve; 10, oil tank. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The functional units with the same labels in the examples of the present invention have the same and similar structures and functions.

[0032] See also Figure 1 The present invention provides a mechanical locking hydraulic cylinder, comprising:

[0033] Cylinder assembly 1, piston assembly 2, guide sleeve assembly 3, drive locking assembly 4 and piston rod 5;

[0034] The cylinder assembly 1 includes a motor mounting plate 101, a cylinder 102, a cylinder bottom 103, a screw rotating seal 104, a support bearing pair 105, a sealing ring 106, a screw adapter sleeve 107 and a bearing oil cylinder 108;

[0035] The piston assembly 2 comprises a piston 201, a first support ring 202, a piston seal 203 and a compression nut;

[0036] The guide sleeve assembly 3 includes a guide sleeve 301, a guide sleeve seal 302, a guide sleeve clamp ring 303, a guide sleeve retaining ring 304, a second support ring 305, a piston rod seal 306, and a dust ring 307;

[0037] The driving locking assembly 4 includes a hydraulic motor 401, a fixing pin 402, a trapezoidal compression nut 403, a locking screw 404, and a locking nut 405;

[0038] One end of the cylinder bottom 103 is connected to the cylinder barrel 102 through the sealing ring 106, and a support bearing pair 105 and a bearing cylinder 108 connected to the support bearing pair 105 are provided inside the cylinder bottom 103, and the other end of the cylinder bottom 103 is connected to the motor mounting plate 101, and the screw rod adapter sleeve 107 sequentially penetrates the motor mounting plate 101 and the cylinder bottom 103 to connect the support bearing pair 105, and the screw rod rotary seal 104 is arranged on the circumference of the screw rod adapter sleeve 107, and the piston 201 is arranged at one end of the cylinder barrel 102 near the bearing cylinder 108, and a first support ring 202 and a piston seal 203 are respectively provided on its circumference, and a compression nut is provided inside the piston 201. The guide sleeve 301 is arranged at the other end of the cylinder 102, and a guide sleeve seal 302, a guide sleeve retaining ring 303 and a guide sleeve retaining ring 304 are respectively arranged around the circumference thereof, and a second support ring 305, a piston rod seal 306 and a dust ring 307 are arranged inside the sleeve, 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, and the piston rod 5 passes through the guide sleeve 301 and the piston 201 in turn, and is fixedly connected to the locking screw 404 through the locking nut 405.

[0039] See also Figure 2 - Figure 5 In this embodiment, the driving locking assembly 4 is mainly used to provide additional push / pull force when the mechanical locking hydraulic cylinder moves; when the mechanical locking hydraulic cylinder stops moving, it automatically provides sufficient mechanical locking force. When the cylinder assembly 1, the piston assembly 2, the guide sleeve assembly 3, and the driving locking assembly 4 are all coaxially installed and the pressure oil is input in the same direction, the movement direction of the cylinder assembly 1, the piston assembly 2, the guide sleeve assembly 3, the driving locking assembly 4 is consistent with the movement direction of the locking nut 405 in the driving locking assembly 4.

[0040] Specifically, see 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 through the locking nut 405. Since the guide sleeve 301 and the cylinder 102 limit the piston rod 5, the oil inlet and outlet of the hydraulic cylinder supply oil to drive the piston rod 5 to perform axial telescopic movement. At the same time, when the hydraulic motor 401 drives the locking screw 404 to rotate, it drives the locking nut 405 to move forward and backward on the axis.

[0041] See also Figure 6When the present invention is in use, the hydraulic motor 401 is also connected to the oil filter 6, the hydraulic pump 7, the electromagnetic reversing valve 8, the overflow valve 9 and the oil tank 10 respectively. When the pressure oil of 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, and the speed is slightly faster than the running speed of the hydraulic cylinder. At the same time, an additional push (pull) force can be provided, and the mechanical load moves simultaneously under the drive of the hydraulic cylinder; when the push (pull) provided by the pressure oil is not enough to drive the mechanical load to move, the locking screw 404 and the locking nut 405 are self-locked. Since the locking screw 404 is in a fixed state axially, the locking nut 405 cannot be driven to move axially, and the piston rod 5 fixed to the locking nut 405 is also locked synchronously. The mechanical locking hydraulic cylinder can be extended with movement and self-locked at any position, which increases the load capacity of the hydraulic cylinder, has a wide range of applications and a reliable structure.

[0042] In another embodiment, the hydraulic motor 401 and the locking screw 404 may be coaxially connected, and the output shaft of the hydraulic motor 401 is connected to the locking screw 404 via a coupling or a key.

[0043] In another embodiment, the hydraulic motor 401 and the locking screw 404 may be coaxially connected, and the output shaft of the hydraulic motor 401 is connected to the locking screw 404 via a gear or a belt.

[0044] In another embodiment, the locking screw 404 and the locking nut 405 form a kinematic pair, and the helix angle of the locking screw 404 is smaller than the friction angle of the locking screw 404, so that effective self-locking can be achieved.

[0045] In another embodiment, the locking screw 404 is fixedly connected to the supporting bearing pair 105 to ensure that the locking screw 404 can rotate freely while being able to withstand a sufficiently large axial push / pull force.

[0046] In the present invention, the piston rod 5 is fixed by passing through the guide sleeve 301 and the piston 201 of the piston assembly 2, and the limiting is achieved based on the cylinder barrel 102 and the guide sleeve 301. The oil inlet and outlet of the hydraulic cylinder supply oil to drive the piston rod 5 to perform axial telescopic movement, thereby realizing locking the hydraulic cylinder at any position without the need for an additional oil source. The electric cylinder has a low structural complexity and good reliability, and can realize movement, hovering and locking at any position.

[0047] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the existence of other identical elements in the process, article or device including the elements.

[0048] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be 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 the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A mechanical locking hydraulic cylinder, characterized in that: include: Cylinder assembly, piston assembly, guide sleeve assembly, drive locking assembly and piston rod; Cylinder assembly, including motor mounting plate, cylinder, cylinder bottom, screw rotating seal, support bearing pair, sealing ring, screw adapter sleeve and bearing oil cylinder; A piston assembly, comprising a piston, a first support ring, a piston seal and a compression nut; A guide sleeve assembly, including a guide sleeve, a guide sleeve seal, a guide sleeve clamp ring, a guide sleeve retaining ring, a second support ring, a piston rod seal, and a dust ring; A driving locking assembly, including a hydraulic motor, a fixing pin, a trapezoidal compression nut, a locking screw, and a locking nut; One end of the cylinder bottom is connected to the cylinder barrel through the sealing ring, and a support bearing pair and a bearing oil cylinder connected to the support bearing pair are arranged inside the cylinder bottom. The other end of the cylinder bottom is connected to the motor mounting plate, and the screw rod adapter sleeve sequentially passes through the motor mounting plate and the cylinder bottom to connect the support bearing pair. The screw rod rotary seal is arranged on the circumference of the screw rod adapter sleeve, and the piston is close to the bearing oil cylinder and arranged at one end inside the cylinder barrel, and a first support ring and a piston seal are arranged on its circumference, and a compression nut is arranged on the internal connection of the piston. The guide sleeve is arranged at the other end inside the cylinder barrel, and a guide sleeve seal, a guide sleeve clamp ring and a guide sleeve retaining ring are arranged on its circumference, and a second support ring, a piston rod seal and a dust ring are arranged inside the piston. The locking screw passes through the trapezoidal compression nut to fix the output shaft of the hydraulic motor, and is connected to the cylinder barrel through the fixing pin. The hydraulic motor is connected to the cylinder bottom through the motor mounting plate, and the locking nut is fixedly connected to the piston rod. The piston rod sequentially passes through the guide sleeve and the piston, and is fixedly connected to the locking screw through the locking nut.

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

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

4. The mechanical locking hydraulic cylinder according to claim 1, characterized in that: The method of fixing and connecting the locking screw rod by the locking nut comprises: The locking screw and the locking nut form a kinematic pair, and the helix angle of the kinematic pair is smaller than the friction angle of the locking screw.

5. The mechanical locking hydraulic cylinder according to claim 1, characterized in that: The locking screw passes through the trapezoidal compression nut to fix the output shaft of the hydraulic motor, and further comprises: The locking screw is fixedly connected to the support bearing pair.

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