Combined piston rod type support oil cylinder

Abstract

The invention discloses a combined piston rod type support oil cylinder which comprises a cylinder barrel, a mounting flange, a first rod body, a locking nut, a second rod body, a guide sleeve, a sleeve, a front gland and a rear gland, wherein the second rod body, the guide sleeve, the sleeve, the front gland and the rear gland are mounted in the cylinder barrel. The first rod body and the second rod body are in threaded connection to form a piston rod, trapezoidal threads are arranged on a rod body of the first rod body, the locking nut is in threaded connection with the first rod body, and the mounting flange is arranged on a barrel body of the cylinder barrel in a sleeving mode. The problem that the whole piston rod is difficult to maintain is solved, and quick replacement of the threaded section is achieved; hydraulic pressure maintaining is replaced by mechanical locking, and the oil leakage risk of the system is eliminated. The structure is particularly suitable for industrial equipment, oil drilling equipment and other high-load scenes needing long-term stable supporting, and the maintainability and reliability are remarkably improved while the bearing capacity is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic cylinders, and more particularly to a combined piston rod type outrigger cylinder. Background Art

[0002] As a core actuator that converts hydraulic energy into mechanical energy, hydraulic cylinders play an important role in the fields of construction machinery, industrial equipment, oil drilling, etc. There are generally three technical pain points in traditional outrigger cylinders: First, the integral piston rod structure leads to strict requirements for the length of raw materials. Especially for piston rods with trapezoidal threads, the processing difficulty is great. Once the thread is damaged, the whole piston rod must be replaced, resulting in high maintenance costs. Second, complex positioning stop mouths need to be machined on the inner wall of the cylinder barrel to fix the guide sleeve. For long-stroke cylinders, it is difficult to ensure the machining accuracy. Third, the existing outrigger cylinders rely on the continuous pressure maintaining of the hydraulic system to maintain the extended state, which is prone to internal leakage and oil leakage failures. Although some industrial equipment uses piston rods with trapezoidal threads to achieve mechanical locking, the integral structure makes the maintenance work extremely cumbersome after the thread is damaged. In addition, the disassembly and assembly of the guide sleeve must completely withdraw the piston rod, bringing great inconvenience to daily maintenance. These structural defects seriously restrict the reliability and service life of outrigger cylinders under heavy load conditions. Summary of the Invention

[0003] In view of this, the present invention provides a combined piston rod type outrigger cylinder, which has the advantages of reasonable structural design, convenient disassembly, maintenance and mechanical self-locking function.

[0004] To achieve the above object, the present invention provides the following technical solutions: A combined piston rod type outrigger cylinder, comprising: a cylinder barrel, a mounting flange, a first rod body, a locking nut, and a second rod body, a guide sleeve, a sleeve, a front gland and a rear gland installed in the cylinder barrel.

[0005] Wherein, the first rod body is threadedly connected to the second rod body to form a piston rod. A trapezoidal thread is provided on the rod body of the first rod body. The locking nut is screwed on the first rod body. The mounting flange is sleeved on the barrel of the cylinder barrel. When the oil cylinder works, the locking nut extends out together with the first rod body. When the first rod body extends to a predetermined position, rotate the locking nut in the reverse direction of the extending direction of the rod body until the locking nut abuts against the right end face of the cylinder body of the cylinder barrel. When the first rod body retracts, first rotate the locking nut away from the right end face of the cylinder body of the cylinder barrel until the locking nut rotates to the limit position. Secondly, the locking nut retracts together with the first rod body. Finally, after the first rod body completely retracts, rotate the locking nut again to abut against the right end face of the cylinder body of the cylinder barrel.

[0006] Preferably, the guide sleeve is threadedly connected to the left end of the sleeve.

[0007] Preferably, the right end of the sleeve is threadedly connected to the front gland, the rear gland is located on the right side of the front gland and abuts against the front gland, and both the front gland and the rear gland are fixed to the inner wall of the cylinder barrel by threaded connection.

[0008] Preferably, the combined piston rod type outrigger cylinder further includes: a chain assembly, the chain assembly includes a chain and a chain support, the chain support is installed on the barrel body of the cylinder barrel, one end of the chain is fixedly connected to the chain support, and when the piston rod is fully retracted and the lock nut is screwed to abut against the right end face of the cylinder body of the cylinder barrel, the other end of the chain fixes the lock nut.

[0009] Preferably, an oil inlet and an oil return port are provided on the cylinder barrel, the oil inlet is provided on the left end face of the cylinder body of the cylinder barrel and communicates with the rodless cavity of the oil cylinder, and the oil return port is provided on the barrel body of the cylinder barrel and communicates with the rod cavity of the oil cylinder; when the piston rod extends, the oil inlet intakes oil, the oil flows into the rodless cavity, the oil return port returns oil, and the oil flows out of the rod cavity, and when the piston rod retracts, the oil inlet returns oil, the oil flows out of the rodless cavity, the oil return port intakes oil, and the oil flows into the rod cavity.

[0010] The beneficial effects of the present invention are as follows: Compared with the prior art, the present application solves the problem of difficult maintenance of the integral piston rod and realizes the rapid replacement of the threaded section; by replacing hydraulic pressure holding with mechanical locking, the risk of system oil leakage is eliminated. This structure is particularly suitable for high-load scenarios such as industrial equipment and oil drilling equipment that require long-term stable support, significantly improving maintainability and reliability while ensuring bearing capacity.

[0011] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0012] Figure 1 is a cross-sectional view of the combined piston rod type outrigger cylinder of the present invention.

[0013] Reference Signs: 1, cylinder barrel; 2, first rod body; 3, mounting flange; 4, guide sleeve; 5, sleeve; 6, second rod body; 7, chain assembly; 8, front gland; 9, rear gland; 10, lock nut; 11, oil inlet; 12, oil return port. Detailed Embodiments

[0014] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0015] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0016] The following refers to Figure 1 Describe the combined piston rod type outrigger cylinder in the embodiments of the present invention.

[0017] An embodiment of the present application discloses a combined piston rod type outrigger cylinder, including: a cylinder barrel 1, a mounting flange 3, a first rod body 2, a locking nut 10, and a second rod body 6, a guide sleeve 4, a sleeve 5, a front gland 8, and a rear gland 9 installed in the cylinder barrel 1.

[0018] The first rod body 2 is threadedly connected to the second rod body 6 to form a piston rod. A trapezoidal thread is provided on the rod body of the first rod body 2. The locking nut 10 is screwed onto the first rod body 2. The mounting flange 3 is sleeved on the barrel body of the cylinder barrel 1. When the oil cylinder works, the locking nut 10 extends out together with the first rod body 2. When the first rod body 2 extends to a predetermined position, the locking nut 10 is rotated in the reverse direction of the extending direction of the rod body until the locking nut 10 abuts against the right end face of the cylinder body of the cylinder barrel 1. When the first rod body 2 retracts, first, the locking nut 10 is rotated away from the right end face of the cylinder body of the cylinder barrel 1 until the locking nut 10 rotates to the limit position. Second, the locking nut 10 retracts together with the first rod body 2. Finally, after the first rod body 2 completely retracts, the locking nut 10 is rotated again to abut against the right end face of the cylinder body of the cylinder barrel 1.

[0019] Specifically, when the piston rod extends, the hydraulic oil pushes the combined rod body to move outward, and the locking nut 10 moves synchronously. After reaching the set stroke, the operator rotates the locking nut 10 in the reverse direction to make it close to the cylinder body end face, and uses the self-locking of the trapezoidal thread to achieve position fixation, and the system can be completely depressurized. When retracting, first rotate the nut in the forward direction to the limit position to release the locking, the hydraulic oil flows reversely to drive the piston rod to retract, and the nut follows and retracts. After completely retracting, the nut is tightened again, and the self-weight sliding is prevented by fixing with the chain assembly 7.

[0020] Compared with the prior art, traditional outrigger cylinders rely on integral piston rods and hydraulic pressure holding, having the defects of high replacement cost after thread damage, complex machining of the inner hole of the cylinder body, and high risk of oil leakage. This solution realizes modular maintenance through a combined piston rod, and only by replacing the damaged section can the function be restored, significantly shortening the maintenance cycle. The sleeve 5 and the gland assembly simplify the machining process of the inner hole of the cylinder body, effectively improving the machining efficiency. The mechanical locking structure completely eliminates the need for hydraulic pressure holding, avoiding the hidden dangers of internal leakage and oil leakage.

[0021] Through the above technical solution, this application solves the problem of difficult maintenance of the integral piston rod and realizes the rapid replacement of the threaded section; by replacing hydraulic pressure holding with mechanical locking, the risk of system oil leakage is eliminated. This structure is particularly suitable for high-load scenarios such as industrial equipment and oil drilling equipment that require long-term stable support, significantly improving maintainability and reliability while ensuring bearing capacity.

[0022] In some embodiments, for example Figure 1 As shown, the guide sleeve 4 is threadedly connected to the left end of the sleeve 5, the right end of the sleeve 5 is threadedly connected to the front gland 8, the rear gland 9 is located on the right side of the front gland 8 and abuts against the front gland 8, and both the front gland 8 and the rear gland 9 are fixedly connected to the inner wall of the cylinder barrel 1 by threaded connection.

[0023] Specifically, the guide sleeve 4 is fixed through the cooperation of the external thread at the left end and the internal thread at the left end of the sleeve 5. The right end of the sleeve 5 is connected to the inner thread of the front gland 8 by an external thread, and the front gland 8 and the rear gland 9 are fixed to the inner wall of the cylinder barrel 1 by threads. This structure enables the positioning of the guide sleeve 4 not to rely on the positioning stop of the inner wall of the cylinder barrel 1, but to complete the overall fixation through the combined connection of the sleeve 5, the front gland 8, and the rear gland 9. During the machining process, the inner hole of the cylinder barrel 1 does not need to be turned with a mating step, and only standard internal threads need to be machined to meet the installation requirements. When the guide sleeve 4 needs to be disassembled, only the sleeve 5 assembly needs to be screwed out to remove the guide sleeve 4 from the cylinder barrel 1, without completely withdrawing the piston rod.

[0024] Compared with the prior art, traditional outrigger cylinders need to machine a long-stroke positioning stop in the inner hole of the cylinder barrel to fix the guide sleeve, resulting in complex machining processes and high requirements for equipment accuracy. In this solution, the threaded connection method between the sleeve 5 assembly and the guide sleeve 4 is adopted, completely eliminating the machining link of the positioning stop in the inner hole of the cylinder barrel 1. At the same time, in the prior art, when replacing the guide sleeve 4, the piston rod needs to be completely pulled out of the cylinder barrel 1, while in this solution, the maintenance operation of the guide sleeve 4 can be completed by disassembling the sleeve 5 assembly.

[0025] Through the above technical solution, this application solves the problem of difficult machining of the positioning stop in the inner hole of the cylinder body, reduces the complexity of the machining process of the inner hole of the long-stroke cylinder, and at the same time realizes the rapid disassembly and assembly of the guide sleeve 4 and the sleeve 5 assembly, avoiding the cumbersome operation of completely pulling out the piston rod from the cylinder barrel 1, and significantly improving the maintenance efficiency.

[0026] In some embodiments, for example Figure 1 As shown, the combined piston rod type outrigger cylinder further includes: a chain assembly 7, the chain assembly 7 includes a chain and a chain support, the chain support is installed on the barrel body of the cylinder barrel 1, one end of the chain is fixedly connected to the chain support, and when the piston rod is fully retracted and the lock nut 10 is screwed to abut against the right end face of the cylinder body of the cylinder barrel 1, the other end of the chain is fixed to the lock nut 10.

[0027] Specifically, when the piston rod is fully retracted into the cylinder barrel 1, the lock nut 10 abuts against the right end face of the cylinder body through a reverse rotation action. At this time, the free end of the chain is fixed to the lock nut 10. The rigid connection of the chain support causes the chain to be in a tensioned state, applying an axial restraint force to the lock nut 10 to counteract the axial load caused by the self-weight of the piston rod. The thread self-locking of the lock nut 10 and the mechanical restraint of the chain constitute a dual locking mechanism to prevent the piston rod from displacing due to vibration or gravity during the non-working state. The external installation method of the chain support on the barrel body avoids machining additional structures inside the cylinder barrel 1, ensuring the integrity of the cylinder body seal.

[0028] Compared with the prior art, the traditional outrigger cylinder only relies on thread self-locking to prevent the piston rod from falling, but long-term vibration or impact may cause the lock nut to loosen. In this solution, an external mechanical restraint is formed through the chain assembly 7, adding an additional fixing effect after the lock nut 10 is self-locked, significantly improving the anti-displacement ability during the non-working state. There is no publicly disclosed solution in the prior art where an external restraint device cooperates with thread self-locking. In this solution, a dual locking is achieved through the detachable chain assembly 7 while avoiding modifications to the internal structure of the cylinder body.

[0029] Through the above technical solution, the present application effectively solves the problem that the outrigger cylinder falls due to the self-weight of the piston rod during the non-working state. The synergistic effect of the chain assembly 7 and the lock nut 10 forms a redundant locking mechanism, which can still maintain the position of the piston rod through mechanical restraint even when the thread self-locking fails. The external installation method of the chain support simplifies the structural modification, avoids affecting the cylinder body seal, and at the same time, the detachable design of the chain facilitates maintenance operations.

[0030] In some embodiments, for example Figure 1 As shown, an oil inlet 11 and an oil return port 12 are provided on the cylinder barrel 1. The oil inlet 11 is provided on the left end face of the cylinder body of the cylinder barrel 1 and is communicated with the rodless cavity of the oil cylinder, and the oil return port 12 is provided on the barrel body of the cylinder barrel 1 and is communicated with the rod chamber of the oil cylinder; when the piston rod extends, the oil inlet 11 admits oil, the oil flows into the rodless cavity, and the oil return port 12 returns oil, and the oil flows out of the rod chamber. When the piston rod retracts, the oil inlet 11 returns oil, the oil flows out of the rodless cavity, and the oil return port 12 admits oil, and the oil flows into the rod chamber.

[0031] Specifically, during the process of the piston rod extending, hydraulic oil is injected into the rodless cavity through the oil inlet 11 on the left end face, pushing the piston rod to move outward. At the same time, the oil in the rod chamber is discharged to the fuel tank through the oil return port 12 on the cylinder body. At this time, the oil flow direction is in a single-direction drive mode, and the system does not need to maintain a high-pressure state. When the piston rod retracts, the hydraulic oil enters the rod chamber through the oil return port 12, reversely pushing the piston rod to retract inward, while the oil in the rodless cavity flows back through the oil inlet 11, forming a reverse oil circuit. During this process, the switching of the oil flow direction is only achieved through an external valve control system, and the internal oil circuit of the cylinder body maintains a fixed structure, and the oil chamber pressure is automatically adjusted with the movement of the piston rod.

[0032] Compared with the prior art, traditional outrigger cylinders rely on continuous hydraulic pressure holding to maintain the position of the piston rod, resulting in the risk of internal leakage due to the seals being under high pressure for a long time, and at the same time, the energy consumption is relatively high. In this solution, mechanical self-locking is used to replace hydraulic pressure holding. After the piston rod reaches the position, the pressure is immediately relieved, and the oil chamber pressure drops to the ambient pressure level. The seals only need to withstand short-term pressure during the movement process, significantly reducing the probability of oil leakage. In addition, the one-way flow characteristic of the oil circuit structure prevents the oil from staying in the high-pressure area during the non-working state, further reducing energy loss.

[0033] Through the above technical solutions, this application eliminates the risk of seal failure caused by the need for hydraulic system pressure holding, reduces the probability of internal leakage of the outrigger cylinder; through the optimization of the oil flow path, the continuous pressurization time of the hydraulic system is reduced, achieving energy consumption savings; a fixed oil port layout is adopted to avoid complex oil circuit switching mechanisms and simplify the cylinder body processing technology.

[0034] The other components and operations of the combined piston rod type outrigger cylinder according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0035] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0036] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A combined piston rod type outrigger cylinder, characterized in that, Comprising: A cylinder barrel, a mounting flange, a first rod body, a locking nut, and a second rod body, a guide sleeve, a sleeve, a front gland, and a rear gland mounted inside the cylinder barrel; The first rod body is threadedly connected to the second rod body to form a piston rod. A trapezoidal thread is provided on the rod body of the first rod body. The locking nut is screwed onto the first rod body, and the mounting flange is sleeved on the barrel body of the cylinder barrel; When the oil cylinder works, the locking nut extends together with the first rod body. When the first rod body extends to a predetermined position, rotate the locking nut in the reverse direction of the extending direction of the rod body until the locking nut abuts against the right end face of the cylinder body of the cylinder barrel; when the first rod body retracts, first rotate the locking nut away from the right end face of the cylinder body of the cylinder barrel until the locking nut rotates to the limit position. Secondly, the locking nut retracts together with the first rod body. Finally, after the first rod body completely retracts, rotate the locking nut again until it abuts against the right end face of the cylinder body of the cylinder barrel.

2. The guide sleeve is threadedly connected to the left end of the sleeve.

3. The combined piston rod type outrigger cylinder according to claim 2, wherein, The right end of the sleeve is threadedly connected to the front gland. The rear gland is located on the right side of the front gland and abuts against the front gland. Both the front gland and the rear gland are fixed to the inner wall of the cylinder barrel by threaded connection.

4. The combined piston rod type outrigger cylinder according to claim 1, wherein Further comprising: A chain assembly, which includes a chain and a chain support. The chain support is mounted on the barrel body of the cylinder barrel. One end of the chain is fixedly connected to the chain support. When the piston rod completely retracts and the locking nut rotates to abut against the right end face of the cylinder body of the cylinder barrel, the other end of the chain fixes the locking nut.

5. The combined piston rod type outrigger cylinder according to claim 1, wherein, An oil inlet and an oil return port are provided on the cylinder barrel. The oil inlet is provided on the left end face of the cylinder body of the cylinder barrel and communicates with the rodless cavity of the oil cylinder. The oil return port is provided on the barrel body of the cylinder barrel and communicates with the rod chamber of the oil cylinder; when the piston rod extends, the oil inlet admits oil, and the oil flows into the rodless cavity, and the oil return port returns oil, and the oil flows out of the rod chamber. When the piston rod retracts, the oil inlet returns oil, and the oil flows out of the rodless cavity, and the oil return port admits oil, and the oil flows into the rod chamber.

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