Oil cylinder stroke-increasing type stepless retaining mechanism

Abstract

The utility model discloses a range-extending type stepless retaining mechanism of an oil cylinder. The range-extending type stepless retaining mechanism comprises a universal head, a piston rod, a retaining nut, a retaining nut seat and an oil cylinder main body, the piston end of the piston rod is slidably mounted in the oil cylinder body, the retaining nut seat is of a hollow columnar structure, and the bottom of the retaining nut seat is rotatably arranged at a top opening of the oil cylinder body. Internal threads are formed on the inner wall of the retaining nut seat, external threads are formed on the outer wall of the retaining nut, the retaining nut is screwed in the retaining nut seat through matching of the internal threads and the external threads, and the bottom of the retaining nut is mounted at the other end of the piston rod; and the height of the retaining nut seat is greater than that of the retaining nut, so that when the piston rod is pushed out of the oil cylinder main body, the retaining nut synchronously moves in the retaining nut seat through the internal thread and the external thread. The utility model relates to the technical field of oil cylinder equipment, and can solve the problem that a piston rod of an oil cylinder in the prior art fails and retracts.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder equipment technology, and in particular to a hydraulic cylinder range extender stepless anti-reverse mechanism. Background Technology

[0002] In the construction of deep foundation pit projects adjacent to subways and tunnels, support axial force servo systems are often used. The main loading component of the support axial force servo system is the hydraulic cylinder. The hydraulic cylinder consists of a cylinder body and a piston rod. Under the action of hydraulic pressure, the piston rod extends out of the cylinder body or retracts into the cylinder body.

[0003] In existing hydraulic cylinders, when the piston rod is extended under load and pressure, the piston rod may fail to maintain the required force due to internal leakage or malfunction of the hydraulic power mechanism supporting the axial force servo system, causing it to retract and affecting the normal loading operation of the cylinder. Therefore, a piston rod extension-type continuously variable anti-retraction mechanism is needed to solve the piston rod retraction problem in existing hydraulic cylinders. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic cylinder range extender stepless retraction mechanism, which can solve the problem of piston rod failure and retraction in existing hydraulic cylinders.

[0005] This utility model is implemented as follows:

[0006] A hydraulic cylinder-type stepless anti-reverse mechanism includes a universal joint, a piston rod, an anti-reverse nut, an anti-reverse nut seat, and a hydraulic cylinder body. The piston end of the piston rod is slidably installed inside the hydraulic cylinder body. The anti-reverse nut seat is a hollow cylindrical structure, and its bottom is rotatably located at the top opening of the hydraulic cylinder body. An internal thread is formed on the inner wall of the anti-reverse nut seat, and an external thread is formed on the outer wall of the anti-reverse nut. The anti-reverse nut is screwed into the anti-reverse nut seat through the matching of the internal and external threads, and the bottom of the anti-reverse nut is installed on the other end of the piston rod. The height of the anti-reverse nut seat is greater than the height of the anti-reverse nut, so that when the piston rod pushes out of the hydraulic cylinder body, the anti-reverse nut moves synchronously within the anti-reverse nut seat through the internal and external threads.

[0007] When the piston rod's extension stroke exceeds the range of movement of the anti-reverse nut within the anti-reverse nut seat, the bottom of the anti-reverse nut seat disengages from the top of the cylinder body, and the anti-reverse pad is matched and locked in the gap between the anti-reverse nut seat and the cylinder body. Several anti-reverse pads are arranged at intervals along the circumference of the cylinder body.

[0008] The bottom of the anti-reverse pad has an inverted L-shaped structure, so that the horizontal bottom surface of the anti-reverse pad is attached to the top opening end face of the cylinder body, and the vertical side of the anti-reverse pad is attached to the outer side wall of the cylinder body; the top of the anti-reverse pad has a flat structure and is attached to the bottom surface of the anti-reverse nut seat.

[0009] The top of the anti-reverse nut is provided with a universal head seat, and the ball shaft end of the universal head is rotatably embedded in the ball shaft groove of the universal head seat. The connecting end of the universal head is located outside the universal head seat.

[0010] The universal head seat has several through holes. The fixing member is inserted into the through holes and penetrates the bottom surface of the universal head seat, so that the universal head seat is detachably fixed to the top of the anti-reverse nut by the fixing member.

[0011] The top of the universal head is fitted with a pressure cap by a fastener, which covers the edge of the through hole and the ball joint groove.

[0012] The cylinder body is equipped with a positioning ring coaxially. The outer ring of the positioning ring is fixed to the inner wall of the cylinder body, and the inner ring of the positioning ring slides in contact with the piston rod.

[0013] The cylinder body is provided with a limiting ring coaxially. The outer ring of the ring-shaped limiting ring is fixed to the inner wall of the cylinder body, the inner ring of the limiting ring slides in contact with the piston rod, and the top surface of the limiting ring is flush with the top opening end face of the cylinder body.

[0014] The universal joint, piston rod, anti-reverse nut, anti-reverse nut seat, and cylinder body are coaxially arranged.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] 1. This utility model, by incorporating a stop nut and a stop nut seat, allows the stop nut seat to rotate during the piston rod extension process. The internal and external threads then drive the stop nut to move axially within the stop nut seat and extend synchronously with the piston rod. The high precision of the thread rotation adjustment ensures the stepless stop function of the piston rod through the engagement of the internal and external threads, guaranteeing reliable piston rod thrust and cylinder safety. This effectively solves the problem of piston rod failure and retraction in existing hydraulic cylinders.

[0017] 2. Because this utility model is equipped with a backstop pad, when the piston rod has a large extension stroke, the backstop pad of the corresponding height can be used to support the piston rod between the backstop nut seat and the cylinder body, ensuring the transmission of the cylinder loading force and its reaction force, thereby increasing the piston rod extension stroke and reducing the length of the cylinder. It is especially suitable for construction applications in confined spaces. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the structure of the hydraulic cylinder range extender stepless anti-reverse mechanism of this utility model (piston rod not extended);

[0019] Figure 2 This is a schematic diagram of the structure of the hydraulic cylinder range extender stepless anti-reverse mechanism of this utility model (piston rod extended).

[0020] In the diagram, 1 is the universal head, 2 is the piston rod, 3 is the anti-reverse nut, 31 is the external thread, 4 is the anti-reverse nut seat, 41 is the internal thread, 5 is the universal head seat, 51 is the through hole, 6 is the anti-reverse pad, 7 is the pressure cap, 8 is the fixing part, 9 is the positioning ring, 10 is the cylinder body, and 11 is the limit ring. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Please see the appendix Figure 1 and attached Figure 2 A hydraulic cylinder-type stepless anti-reverse mechanism includes a universal joint 1, a piston rod 2, an anti-reverse nut 3, an anti-reverse nut seat 4, and a hydraulic cylinder body 10. The piston end of the piston rod 2 is slidably installed inside the hydraulic cylinder body 10. The anti-reverse nut seat 4 is a hollow cylindrical structure, and its bottom is rotatably located at the top opening of the hydraulic cylinder body 10. An internal thread 41 is formed on the inner wall of the anti-reverse nut seat 4, and an external thread 31 is formed on the outer wall of the anti-reverse nut 3. The anti-reverse nut 3 is screwed into the anti-reverse nut seat 4 through the matching of the internal thread 41 and the external thread 31, and the bottom of the anti-reverse nut 3 is installed on the other end of the piston rod 2. The height of the anti-reverse nut seat 4 is greater than the height of the anti-reverse nut 3, so that when the piston rod 2 pushes out of the hydraulic cylinder body 10, the anti-reverse nut 3 moves synchronously within the anti-reverse nut seat 4 through the internal thread 41 and the external thread 31.

[0023] Universal joint 1 connects to the component requiring pressure. When piston rod 2 is pushed out of cylinder body 10 by hydraulic pressure, piston rod 2 is loaded with force. If internal leakage occurs in the cylinder or the hydraulic power mechanism of the supporting shaft force servo system fails, piston rod 2 will be unable to maintain the corresponding pressure, or may even fail and retract. Therefore, while piston rod 2 is pushed out under hydraulic pressure, the anti-reverse nut seat 4 is rotated, and the anti-reverse nut 3 is pushed out synchronously with piston rod 2 by the thread transmission of internal thread 41 and external thread 31.

[0024] Preferably, in the initial state, i.e., when the piston rod 2 is fully retracted into the cylinder body 10, the retaining nut 3 is located at the bottom of the retaining nut seat 4, and the bottom surface of the retaining nut 3, the bottom surface of the retaining nut seat 4, and the top surface of the cylinder body 10 are flush. In the working state, the retaining nut 3 can be rotated and adjusted to any position within the retaining nut seat 4 to accommodate different extension lengths of the piston rod 2. The height of the retaining nut seat 4 can be adaptively selected according to the extension stroke of the piston rod 2, so that the movement of the retaining nut 3 from the bottom to the top of the retaining nut seat 4 can meet the extension stroke of the piston rod 2.

[0025] The top pressure reaction force of the universal joint 1 acts on the anti-reverse nut seat 4 and the anti-reverse nut 3, causing the anti-reverse nut seat 4 to press against the top opening of the cylinder body 10. The engagement of the internal thread 41 and the external thread 31 provides reliable support for the piston rod 2, ensuring reliable piston rod extension. The thread pitch of the internal thread 41 and the external thread 31 can be set to 1mm, thus achieving stepless anti-reverse function and higher safety. The internal thread 41 and the external thread 31 are located inside the anti-reverse nut seat 4, making them less susceptible to scratches, resulting in a long service life and high safety and reliability.

[0026] Preferably, lubricating oil can be applied between the bottom of the anti-reverse nut seat 4 and the top opening of the cylinder body 10 to ensure that the anti-reverse nut seat 4 can rotate smoothly under the condition of the universal head 1 being loaded.

[0027] Please see the appendix Figure 2 When the extension stroke of the piston rod 2 is greater than the movement range of the stop nut 3 within the stop nut seat 4, the bottom of the stop nut seat 4 disengages from the top of the cylinder body 10, and the stop pad 6 is matched and locked in the gap between the stop nut seat 4 and the cylinder body 10. Several stop pads 6 are arranged at intervals along the circumference of the cylinder body 10.

[0028] When the piston rod 2 has a large extension stroke, the reaction force of the universal head 1 can be transmitted to the cylinder body 10 through the anti-reverse nut 3, anti-reverse nut seat 4 and anti-reverse nut 6 by adding a backstop pad 6. The engagement of the internal thread 41 and the external thread 31 ensures the reliability of the piston rod 2 extension, and the extension stroke of the piston rod 2 is increased by using the backstop pad 6.

[0029] Meanwhile, by setting the anti-reverse pad 6, the overall length of the hydraulic cylinder can be reduced by utilizing the stroke extension function, which is especially suitable for construction applications in confined spaces.

[0030] Please see the appendix Figure 1 and attached Figure 2 The top of the anti-reverse nut 3 is provided with a universal head seat 5, and the ball shaft end of the universal head 1 is rotatably embedded in the ball shaft groove of the universal head seat 5. The connecting end of the universal head 1 is located outside the universal head seat 5.

[0031] The universal head seat 5 facilitates the installation of the universal head 1 on top of the anti-reverse nut 3. The ball shaft end of the universal head 1 can rotate relative to the ball shaft groove, which can prevent the cylinder from being subjected to uneven load and can meet the support requirements of the universal head 1 in different directions.

[0032] Please see the appendix Figure 1 and attached Figure 2 The universal head seat 5 has several through holes 51. The fixing member 8 is inserted into the through holes 51 and passes through the bottom surface of the universal head seat 5, so that the universal head seat 5 is detachably fixed to the top of the anti-reverse nut 3 by the fixing member 8.

[0033] Preferably, the fastener 8 can be made of high-strength bolts, which facilitates the connection between the universal head 5 and the anti-reverse nut 3, making disassembly and assembly convenient and the connection reliable. The number of through holes 51 can be adjusted according to actual installation requirements, and each through hole 51 is equipped with one fastener 8.

[0034] Please see the appendix Figure 1 and attached Figure 2 The top of the universal head seat 5 is fitted with a pressure cover 7 via a fastener 8, which covers the through hole 51 and the edge of the ball joint groove.

[0035] After adjusting the angle of the universal head 1 by rotation, the pressure cap 7 can be installed using high-strength bolts, i.e., fasteners 8. The pressure cap 7 restricts the rotation of the universal head 1, thereby ensuring the stability of the universal head 1 under load support. At the same time, the pressure cap 7 covers the through hole 51, which facilitates the protection of the fasteners 8 that connect the anti-reverse nut and the universal head seat 5.

[0036] Please see the appendix Figure 2 The bottom of the anti-reverse pad 6 is inverted L-shaped, so that the horizontal bottom surface of the anti-reverse pad 6 is attached to the top opening end face of the cylinder body 10, and the vertical side of the anti-reverse pad 6 is attached to the outer side wall of the cylinder body 10; the top of the anti-reverse pad 6 is flat and is attached to the bottom surface of the anti-reverse nut seat 4.

[0037] The height of the anti-reverse pad 6 can be selected according to the distance between the anti-reverse nut seat 4 and the cylinder body 10. Preferably, the anti-reverse pad 6 can be made of metal block, which provides high support stability. The inverted L-shaped structure at the bottom of the anti-reverse pad 6 can better fit the top of the cylinder body 10, increase the contact area, and improve support stability.

[0038] Please see the appendix Figure 1 and attached Figure 2 The cylinder body 10 is provided with a positioning ring 9 coaxially inside. The outer ring of the positioning ring 9 is fixed on the inner wall of the cylinder body 10, and the inner ring of the positioning ring 9 is in sliding contact with the piston rod 2.

[0039] The positioning ring 9 provides guidance and limitation for the extension and retraction of the piston rod 2, ensuring the linearity of the piston rod 2's movement and its coaxiality with the cylinder body 10. The position of the positioning ring 9 within the cylinder body 10 can be adaptively adjusted according to actual needs.

[0040] Please see the appendix Figure 1 and attached Figure 2 The cylinder body 10 is provided with a limiting ring 11 coaxially inside. The outer ring of the ring-shaped limiting ring 11 is fixed on the inner wall of the cylinder body 10. The inner ring of the limiting ring 11 slides in contact with the piston rod 2. The top surface of the limiting ring 11 is flush with the top opening end face of the cylinder body 10.

[0041] Preferably, a portion of the horizontal bottom surface of the anti-reverse pad 6 can be attached to the top surface of the limiting ring 11, thereby further improving the support stability of the anti-reverse pad 6. At the same time, the limiting ring 11 can be used to limit the downward movement range of the anti-reverse nut 3, preventing the anti-reverse nut 3 from falling out of the anti-reverse nut seat 4 and entering the cylinder body 10.

[0042] Please see the appendix Figure 1 and attached Figure 2 The universal joint 1, piston rod 2, anti-reverse nut 3, anti-reverse nut seat 4 and cylinder body 10 are coaxially arranged to ensure stress stability and prevent the cylinder from being subjected to uneven load.

[0043] Please see the appendix Figure 1 and attached Figure 2 The working process and working principle of this utility model are as follows:

[0044] The universal joint 1 is connected to a component that needs to be pressed. When the cylinder is working, the oil pressure in the cylinder body 10 pushes the piston rod 2 out of the cylinder body 10, and the anti-reverse nut seat 4 abuts against the top opening of the cylinder body 10 under the reaction force.

[0045] As the piston rod 2 is pushed out, the anti-reverse nut seat 4 can be rotated manually or with mechanical tools. Since the anti-reverse nut 3 is restricted by the piston rod 2 and cannot rotate, the rotation of the anti-reverse nut seat 4 is converted into the axial linear motion of the anti-reverse nut 3 within the anti-reverse nut seat 4 by the thread transmission of the external thread 31 and the internal thread 41. This allows the anti-reverse nut 3 to be pushed out synchronously with the piston rod 2, and the thread transmission of the external thread 31 and the internal thread 41 can adapt to different extension lengths of the piston rod 2.

[0046] When the extension stroke of piston rod 2 does not exceed the maximum stroke of the stop nut 3 within the stop nut seat 4 (i.e., the stop nut 3 moves from the bottom to the top of the stop nut seat 4), the thread engagement of the external thread 31 and the internal thread 41 can be used to ensure the loading stability of piston rod 2. This prevents the piston rod 2 from failing to maintain the corresponding top force due to internal leakage of the oil cylinder or failure of the hydraulic power mechanism of the support shaft force servo system, thus preventing the piston rod 2 from retracting due to failure. This ensures the normal loading operation of the oil cylinder.

[0047] When the piston rod 2's extension stroke exceeds the maximum travel of the anti-reverse nut 3 within the anti-reverse nut seat 4, the bottom of the anti-reverse nut seat 4 disengages from the cylinder body 10. An anti-reverse pad 6 of appropriate height is used to support the bottom of the anti-reverse nut seat 4 between the top opening of the cylinder body 10. The engagement of the external thread 31 and the internal thread 41, along with the support of the anti-reverse pad 6, ensures the stability of the piston rod 2's extension and loading, as well as the normal operation of the cylinder.

[0048] After the hydraulic cylinder has finished working, remove the anti-reverse pad 6 in reverse as described above, and then retract the piston rod 2 and the anti-reverse nut 3.

[0049] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A hydraulic cylinder-type stepless anti-reverse mechanism, characterized in that: The cylinder includes a universal joint (1), a piston rod (2), a retaining nut (3), a retaining nut seat (4), and a cylinder body (10). The piston end of the piston rod (2) is slidably installed inside the cylinder body (10). The retaining nut seat (4) is a hollow cylindrical structure, and the bottom of the retaining nut seat (4) is rotatably set at the top opening of the cylinder body (10). An internal thread (41) is formed on the inner wall of the retaining nut seat (4), and an internal thread (41) is formed on the outer wall of the retaining nut (3). The external thread (31) and the anti-reverse nut (3) are screwed into the anti-reverse nut seat (4) through the matching of the internal thread (41) and the external thread (31), and the bottom of the anti-reverse nut (3) is installed on the other end of the piston rod (2); the height of the anti-reverse nut seat (4) is greater than the height of the anti-reverse nut (3), so that when the piston rod (2) pushes out of the cylinder body (10), the anti-reverse nut (3) moves synchronously in the anti-reverse nut seat (4) through the internal thread (41) and the external thread (31).

2. The hydraulic cylinder-type stepless anti-reverse mechanism according to claim 1, characterized in that: When the extension stroke of the piston rod (2) is greater than the movement range of the anti-reverse nut (3) within the anti-reverse nut seat (4), the bottom of the anti-reverse nut seat (4) disengages from the top of the cylinder body (10), and the anti-reverse pad (6) is matched and locked in the gap between the anti-reverse nut seat (4) and the cylinder body (10). Several anti-reverse pads (6) are arranged at intervals along the circumference of the cylinder body (10).

3. The hydraulic cylinder-type stepless anti-reverse mechanism according to claim 2, characterized in that: The bottom of the anti-reverse pad (6) is inverted L-shaped, so that the horizontal bottom surface of the anti-reverse pad (6) is attached to the top opening end face of the cylinder body (10), and the vertical side of the anti-reverse pad (6) is attached to the outer side wall of the cylinder body (10); the top of the anti-reverse pad (6) is flat and is attached to the bottom surface of the anti-reverse nut seat (4).

4. The hydraulic cylinder-type continuously variable anti-reverse mechanism according to claim 1 or 2, characterized in that: The top of the anti-reverse nut (3) is provided with a universal head seat (5), and the ball shaft end of the universal head (1) is rotatably embedded in the ball shaft groove of the universal head seat (5). The connecting end of the universal head (1) is located outside the universal head seat (5).

5. The hydraulic cylinder-type continuously variable anti-reverse mechanism according to claim 4, characterized in that: The universal head seat (5) has several through holes (51) formed inside. The fixing member (8) is inserted into the through holes (51) and passes through the bottom surface of the universal head seat (5), so that the universal head seat (5) is detachably fixed to the top of the anti-reverse nut (3) by the fixing member (8).

6. The hydraulic cylinder-type stepless anti-reverse mechanism according to claim 5, characterized in that: The top of the universal head (5) is fitted with a pressure cap (7) by a fastener (8), which covers the edge of the through hole (51) and the ball joint groove.

7. The hydraulic cylinder-type stepless anti-reverse mechanism according to any one of claims 1-3, characterized in that: The cylinder body (10) is provided with a positioning ring (9) coaxially inside. The outer ring of the positioning ring (9) is fixed on the inner wall of the cylinder body (10), and the inner ring of the positioning ring (9) slides in contact with the piston rod (2).

8. The hydraulic cylinder-type stepless anti-reverse mechanism according to claim 7, characterized in that: The cylinder body (10) is provided with a limiting ring (11) coaxially. The outer ring of the ring-shaped limiting ring (11) is fixed on the inner wall of the cylinder body (10). The inner ring of the limiting ring (11) slides in contact with the piston rod (2). The top surface of the limiting ring (11) is flush with the top opening end face of the cylinder body (10).

9. The hydraulic cylinder-type stepless anti-reverse mechanism according to claim 1, characterized in that: The universal joint (1), piston rod (2), anti-reverse nut (3), anti-reverse nut seat (4) and cylinder body (10) are coaxially arranged.

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