Directional rotation hydraulic cylinder with rotation prevention function and using method

Abstract

According to the directional rotating hydraulic cylinder with the rotation preventing function and the using method, a guide rod is arranged in a rodless cavity of a cylinder barrel, one end of the guide rod is connected with the end of the cylinder barrel, and the other end of the guide rod extends into a piston rod; the piston rod is provided with a positioning knob, the positioning knob is connected with a steel ball, and the guide rod is provided with a U-shaped track groove; an oil port A and an oil port B are formed in the end of the cylinder barrel, the oil port A is communicated with a rodless cavity of the cylinder barrel, and the oil port B is communicated with a rod cavity of the cylinder barrel through a one-way valve, a guide rod and a piston rod. The oil port B is further provided with a hydraulic control one-way valve, and the hydraulic control end of the hydraulic control one-way valve is connected with the rodless cavity. The anti-rotation directional rotating hydraulic cylinder with the guide rail and the rotating mechanism can be replaced, the cost is reduced, and the space is saved; a directional rotating system consisting of a track U-shaped groove guide rod, a blind hole piston rod, a steel ball, a positioning knob and a cylinder barrel with a multifunctional cylinder bottom provides guarantee for smoothly passing through a narrow space, and is convenient to disassemble, assemble and maintain; the track U-shaped groove is good in adaptability and effect under any working condition, and the hydraulic structure is good in accuracy and high in reliability.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, in particular to a directional rotating hydraulic cylinder with anti-rotation function and a use method thereof. Background Art

[0002] As the actuator of the hydraulic system, rotary hydraulic cylinders at home and abroad have the characteristics of simple structure, flexible movement, simple and convenient installation, etc. They are widely used in engineering machinery equipment. However, due to the limited space of the equipment, it is necessary to run linearly through a small space and then rotate to the specified position. Ordinary rotary hydraulic cylinders can no longer achieve this function. In order to meet this working condition requirement, most methods are to use a single-stage cylinder to gradually extend and guide it with a guide rail mechanism to achieve anti-eccentric load and anti-rotation. After passing through a small space in a straight line, it is rotated to the required position through a rotating mechanism. The design and processing are very complicated and the cost is very high. It occupies a large space and the linear motion ability of the guide rail structure is very poor when it is pushed, which affects the working efficiency and safety of the equipment.

[0003] In addition, engineering machinery and equipment are generally used in large-scale projects, and the on-site maintainability is poor, so the reliability requirements are very high. As an important component, the hydraulic cylinder also has very high installation requirements. Its guide rail mechanism takes up a lot of space, and the installation is cumbersome, time-consuming, and inefficient. If the guide rail structure has problems during the operation of the engineering equipment, the hydraulic cylinder will be offset or fail to work, and the equipment will not be able to start or rise and fall, affecting the normal operation of the entire equipment, and in serious cases, safety accidents will occur.

[0004] The cylinder barrel refers to the hollow pressure-bearing part in which the hydraulic cylinder piston moves.

[0005] The piston and piston rod are cylinder parts that move in the cylinder bore and transmit mechanical force and motion by the action of fluid under pressure.

[0006] Seals are components used to prevent leakage and the ingress of contaminants.

[0007] Oil flows inside the rod: Oil holes are drilled inside the piston rod to serve as the oil inlet and outlet channels of the hydraulic cylinder.

[0008] Guide sleeve: The guiding and sealing part of the hydraulic cylinder piston rod, fixed at the end of the cylinder.

[0009] Guide rod: A guide component of a straight rod structure with a floating connection that allows it to run on any trajectory. Summary of the invention

[0010] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a directional rotating hydraulic cylinder with anti-rotation function which has a simple structure and good effect and a method of using the same.

[0011] The present invention is realized by the following technical scheme: a directional rotating hydraulic cylinder with anti-rotation, comprising a cylinder barrel, a piston rod is arranged in the cylinder barrel, one end of the piston rod is arranged in the cylinder barrel, and the other end of the piston rod is connected to a pressure block; a guide rod is arranged in the rodless cavity of the cylinder barrel, one end of the guide rod is connected to the end of the cylinder barrel, the other end of the guide rod extends into the piston rod, and the piston rod is provided with a blind hole for placing the guide rod; a positioning knob is radially provided at the piston end of the piston rod, the positioning knob is connected to a steel ball, and a U-shaped track groove used in conjunction with the steel ball is provided on the guide rod; an oil port A and an oil port B are arranged at the end of the cylinder barrel, the oil port A is connected to the rodless cavity of the cylinder barrel, the oil port B is connected to the rod cavity of the cylinder barrel through the guide rod and the piston rod, the guide rod is a hollow structure, and the blind hole of the piston rod is connected to the rod cavity of the cylinder barrel; the oil port B is also provided with a hydraulically controlled one-way valve, and the hydraulically controlled end of the hydraulically controlled one-way valve is connected to the rodless cavity, It is further provided with a positioning retaining ring outside the cylinder.

[0012] The pressing block is connected to the piston rod through screws, and a retaining ring is provided between the pressing block and the piston rod.

[0013] The open end of the cylinder is provided with a guide sleeve used in conjunction with the piston rod, and a pressure ring is provided outside the guide sleeve.

[0014] One end of the guide rod is connected to the cylinder barrel through a pin.

[0015] A sealing device is provided between the guide rod, the cylinder barrel and the piston rod.

[0016] The positioning knob is installed on the piston end of the piston rod through threads, and the steel ball is gap-matched with the inner ball wall of the positioning knob.

[0017] The U-shaped track groove is designed according to the actual installation space and the requirements of the working condition rising rotation, and includes a rotating curve segment and straight segments at the front and rear ends of the curve segment.

[0018] The cylinder barrel is provided with a blind hole for installing a hydraulically controlled one-way valve, and the hydraulically controlled one-way valve is fixed to the cylinder barrel through threads.

[0019] A method for using a directional rotating hydraulic cylinder with anti-rotation function comprises the following steps: S1, the rodless chamber of the cylinder barrel is filled with oil from the oil port A; S2, the piston rod drives the steel ball to rise vertically along the U-shaped track groove on the guide rod until the pressure block leaves the narrow space; S3, after the pressing block leaves the narrow space, the steel ball enters the set spiral track under the dual effects of the hydraulic cylinder thrust and the steel ball gravity, and the piston rod continues to drive the steel ball to rotate and rise along the set guide rod spiral groove; S4, when the pressing block reaches the predetermined position and angle, it rises straight along the U-shaped groove to the predetermined position; S5, oil enters port B, the piston rod moves back along the U-shaped track groove and is pressed and fixed, and the hydraulically controlled one-way valve is locked; S6. After the work is completed, oil enters port A, the hydraulically controlled one-way valve opens, and the piston rod rises slightly vertically along the U-shaped groove at the end; S7, oil enters port B, the piston rod first falls straight down along the U-groove track, then rotates along the track U-groove to the predetermined direction and falls back along the straight U-groove until the piston rod is fully retracted, and the work is completed.

[0020] The present invention has the following advantages: a directional rotating hydraulic cylinder with anti-rotation function and a method of using the same are provided inside the cylinder with a guide rod and a knob with a spherical groove for use together, and the piston rod drives the steel ball at the front end of the knob to move along the trajectory groove set on the guide rod, so as to achieve the purpose of making the pressure block move along the required trajectory; and the guide rod and the steel ball are both placed inside the hydraulic cylinder, so that the installation space and cost are greatly saved, and a small space can be linearly pushed forward and then seamlessly rotated to the required angle and then pressed down again smoothly, and the one-way valve is locked and fixed after pressing, so as to meet the multi-functional requirements of cost reduction, space saving, time and labor saving, environmental protection, energy saving, safety and reliability, and achieve the purpose of high-efficiency operation of the main engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0022] In the attached picture: Figure 1 It is a front view of the present invention; Figure 2 It is a left side view of the present invention; Figure 3 yes Figure 1 Local schematic diagram along direction A; Figure 4 yes Figure 1 Local schematic diagram along direction B; Figure 5 It is a structural schematic diagram of the lower end of the hydraulic cylinder of the present invention; Figure 6 and Figure 7 yes Figure 5 Cross-sectional view along DD and EE directions; Figure 8 It is a structural schematic diagram of the U-shaped track groove of the present invention; Fig. 9It is a structural schematic diagram of the hydraulically controlled one-way valve of the present invention; Fig.10 It is a principle diagram of the hydraulically controlled one-way valve of the present invention.

[0023] In the figure: 1. cylinder barrel, 2. pin, 3. guide rod, 4. piston rod, 5. guide sleeve, 6. pressure ring, 7. retaining ring, 8. pressure block, 9. screw, 10. positioning retaining ring, 11. steel ball, 12. positioning knob, 13. hydraulically controlled one-way valve, 14. screw plug.

[0024] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0026] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figures 1 to 10The directional rotary hydraulic cylinder with anti-rotation shown in the figure is characterized in that: it comprises a cylinder barrel 1, a piston rod 4 is arranged in the cylinder barrel 1, one end of the piston rod 4 is arranged in the cylinder barrel 1, and the other end of the piston rod 4 is connected to a pressure block 8; a guide rod 3 is arranged in the rodless cavity of the cylinder barrel 1, one end of the guide rod 3 is connected to the end of the cylinder barrel 1, and the other end of the guide rod 3 extends into the piston rod 4, and the piston rod 4 is provided with a blind hole for placing the guide rod 3; the piston end of the piston rod 4 is radially provided with a positioning Knob 12, the positioning knob 12 is connected to the steel ball 11, and the guide rod 3 is provided with a U-shaped track groove used in conjunction with the steel ball 11; the end of the cylinder 1 is provided with an oil port A and an oil port B, the oil port A is connected to the rodless chamber of the cylinder 1, and the oil port B is connected to the rod chamber of the cylinder 1 through the guide rod 3 and the piston rod 4, the guide rod 3 is a hollow structure, and the blind hole of the piston rod 4 is connected to the rod chamber of the cylinder 1; the oil port B is also provided with a hydraulically controlled one-way valve 13, and the hydraulically controlled end of the hydraulically controlled one-way valve 13 is connected to the rodless chamber. The cam is provided with a plurality of guide rods, each of which is connected to a plurality of guide rods, each of which is connected to a plurality of guide rods, each of which is connected to a plurality of guide rods. The blind hole is connected with the rod chamber, and the oil port B is connected with the rod chamber through the guide rod and the piston rod. This structure enables the inlet and outlet oil ports to be set at the bottom of the cylinder, with high integration and improved space utilization. A hydraulically controlled one-way valve is also provided at the oil port B. The oil inlet end of the hydraulically controlled one-way valve is connected to the oil port B, and the spring side of the hydraulically controlled one-way valve is connected to the rod chamber. The hydraulic end of the hydraulically controlled one-way valve is connected with the rodless chamber. Specifically, when in use, when oil enters the rodless chamber (port A), the pressure of the control port connected to the rodless chamber is greater than the spring pressure in the hydraulically controlled one-way valve, pushing the steel ball in the hydraulically controlled one-way valve, the hydraulically controlled one-way valve opens, the oil returns to the rod chamber, and the piston rod rises. When oil enters the rod chamber, the hydraulically controlled one-way valve is opened by pushing the valve core spring, and the oil enters the rod chamber through the one-way valve and the guide rod, and the piston rod descends. After the oil inlet stops, the reverse oil circuit is cut off and the rod chamber oil circuit is locked, which is safe and reliable.

[0029] like Figure 1 to Figure 2The directional rotating hydraulic cylinder with anti-rotation is shown, and the cylinder barrel 1 is provided with a positioning retaining ring 10. When the hydraulic cylinder main machine of the present invention is installed, a flange bracket is installed on the main machine outside the hydraulic cylinder, and the lower end is positioned by the positioning retaining ring and the upper end is tightened and fixed with a nut, so there is no need to measure the position size in a small space, which is convenient for installation.

[0030] like Figure 1 In the illustrated embodiment of a directional rotary hydraulic cylinder with anti-rotation function, the pressure block 8 is connected to the piston rod 4 via a screw 9 , and a retaining ring 7 is provided between the pressure block 8 and the piston rod 4 .

[0031] like Figure 1 to Figure 2 The illustrated embodiment shows a directional rotating hydraulic cylinder with anti-rotation function, wherein the open end of the cylinder barrel 1 is provided with a guide sleeve 5 used in conjunction with the piston rod 4, and the guide sleeve 5 is provided with a pressure ring 6 on the outside. The guide sleeve of the present invention cooperates with the cylinder barrel and the pressure ring, seals the front chamber oil circuit and provides piston rod guidance, while allowing the pressure ring to adjust the entire clamping device through threads, supplementing the inherent internal leakage defect of the hydraulic system, and forming a mechanical hydraulic auxiliary type fixing system, which is safe and reliable.

[0032] like Figure 1 to Figure 2 The illustrated directional rotary hydraulic cylinder with anti-rotation function has one end of the guide rod 3 connected to the cylinder barrel 1 through a pin 2. A sealing device is provided between the guide rod 3, the cylinder barrel 1 and the piston rod 4. The guide rod of the present invention is made of hard material to ensure its mechanical properties and avoid the problem of excessive rolling wear of the steel ball therein, thereby greatly improving its service life. In addition, the fixed pin hole structure and the combination of the sealing groove, the support groove and the inner hole oil circuit designed at both ends can ensure a good closed space and good guidance. The floating structure can be automatically corrected and will not cause eccentric wear due to non-concentric installation.

[0033] like Figure 2 The directional rotary hydraulic cylinder with anti-rotation is shown, the positioning knob 12 is installed on the piston end of the piston rod 4 by thread, and the steel ball 11 is clearance-matched with the inner ball wall of the positioning knob 12. The positioning knob of the present invention is installed on the piston end of the piston rod by thread, and the steel ball is clearance-matched with the inner ball wall of the positioning knob and the U-shaped track groove of the guide rod. The steel ball is suspended between the U-shaped track groove of the guide rod and the positioning knob, and moves freely along the track groove set on the outer wall under the drive of the piston rod.

[0034] like Figure 8The U-shaped track groove on the guide rod of the present invention can change the track design arbitrarily according to the different requirements of the actual installation space and the user's working condition rise and rotation. The design is flexible, and any stroke and rotation angle can find a track suitable for its actual requirements. It has the ability to adapt to various complex working conditions and variable space requirements, ensuring the adaptability of the entire equipment.

[0035] like Figure 1 to Figure 2 The illustrated embodiment shows a directional rotary hydraulic cylinder with anti-rotation function. The cylinder barrel 1 is provided with a blind hole for installing a hydraulically controlled one-way valve 13. The hydraulically controlled one-way valve 13 is fixed to the cylinder barrel 1 through its own external thread, and a screw plug 14 plays a protective and anti-fouling role.

[0036] A method for using a directional rotating hydraulic cylinder with anti-rotation function comprises the following steps: S1, the rodless chamber of the cylinder 1 is filled with oil from the oil port A; S2, the piston rod 4 drives the steel ball 11 to rise vertically along the U-shaped track groove on the guide rod 3 until the pressure block 8 leaves the narrow space; S3, after the pressing block 8 leaves the narrow space, the steel ball 11 enters the set spiral track under the dual effects of the hydraulic cylinder thrust and the weight of the steel ball 11, and the piston rod 4 continues to drive the steel ball to rotate and rise along the set guide rod spiral groove; S4, when the pressing block 8 reaches the predetermined position and angle, it rises straight along the U-shaped groove to the predetermined position; S5, oil enters port B, the piston rod 4 moves back along the U-shaped track groove and is pressed and fixed, and the hydraulically controlled one-way valve 13 is locked; S6. After the work is completed, oil enters the oil port A, the hydraulically controlled one-way valve 13 opens, and the piston rod 4 slightly rises vertically along the U-shaped groove at the end; S7, oil enters port B, the piston rod 4 first falls straight down along the U-shaped groove track, then rotates along the track U-shaped groove to a predetermined direction and falls back along the straight U-shaped groove until the piston rod 4 is fully retracted, and the work is completed.

[0037] The directional rotary hydraulic cylinder with anti-rotation function of the present invention has two working processes: the main rising of the steel ball and the main falling of the steel ball, which are as follows: The steel ball rises mainly: oil enters from port A, the piston rod moves upward, the steel ball first rises linearly along the straight section at the lower end of the U-shaped track groove, then rotates along the curved section to the predetermined direction, and then rises along the straight section at the upper end. After rising to the predetermined position, a cushion block is added (the distance between the pressure block and the main machine structure is fine-tuned for easy fastening), then the oil flow from port A stops, oil enters from port B, the spring in the hydraulically controlled one-way valve is pushed open, and oil enters at full flow. The steel ball falls slightly vertically along the straight line at the upper end until the pressure block presses the cushion block to fix it. After tightening, port B is unloaded, the spring in the hydraulically controlled one-way valve returns to its position, the oil inlet of the rod chamber is sealed, the hydraulically controlled one-way valve is locked, the reverse oil circuit is cut off, the pressure in the rod chamber is maintained, and the work is completed.

[0038] The main fall of the steel ball: oil flows into port A, the pressure of the hydraulic control port is greater than the spring pressure in the hydraulic control one-way valve, the steel ball in the hydraulic control one-way valve is pushed open, the hydraulic control one-way valve is unlocked, and the piston rod rises slightly along the upper linear guide groove. At the same time, the pressure block leaves the cushion block, and the cushion block is removed. Then the oil flow to port A stops, the oil flow to port B, and the oil returns to port A. The steel ball first falls straightly along the upper straight section, then rotates the curved section to the predetermined direction, and then falls back along the lower straight section until the piston rod is fully retracted and the work is completed.

[0039] The directional rotating hydraulic cylinder with anti-rotation function of the present invention can replace the directional rotating hydraulic cylinder with guide rail and rotating mechanism anti-rotation function, thereby reducing cost and saving space. The directional rotating system composed of the guide rod with track U-shaped groove, blind hole piston rod, steel ball, positioning knob and cylinder barrel with multifunctional cylinder bottom provides guarantee for smooth passage through narrow space and is convenient for disassembly and maintenance. The track U-shaped groove has adaptability to any working condition, good effect, good hydraulic structure accuracy and high reliability.

[0040] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0041] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0042] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A directional rotary hydraulic cylinder with anti-rotation function, characterized in that: The invention comprises a cylinder barrel (1), wherein a piston rod (4) is arranged in the cylinder barrel (1), one end of the piston rod (4) is arranged in the cylinder barrel (1), and the other end of the piston rod (4) is connected to a pressure block (8); a guide rod (3) is arranged in the rodless cavity of the cylinder barrel (1), one end of the guide rod (3) is connected to the end of the cylinder barrel (1), and the other end of the guide rod (3) extends into the piston rod (4), and the piston rod (4) is provided with a blind hole for accommodating the guide rod (3); a positioning knob (12) is radially provided at the piston end of the piston rod (4), and the positioning knob (12) is radially provided at the piston end of the piston rod (4). The knob (12) is connected to a steel ball (11), and the guide rod (3) is provided with a U-shaped track groove used in conjunction with the steel ball (11); an oil port A and an oil port B are provided at the end of the cylinder barrel (1), the oil port A is connected to the rodless chamber of the cylinder barrel (1), and the oil port B is connected to the rod chamber of the cylinder barrel (1) through the guide rod (3) and the piston rod (4), the guide rod (3) is a hollow structure, and the blind hole of the piston rod (4) is connected to the rod chamber of the cylinder barrel (1); the oil port B is also provided with a hydraulically controlled one-way valve (13), and the hydraulically controlled end of the hydraulically controlled one-way valve (13) is connected to the rodless chamber.

2. A directional rotary hydraulic cylinder with anti-rotation function as claimed in claim 1, characterized in that: A positioning retaining ring (10) is provided outside the cylinder barrel (1).

3. A directional rotating hydraulic cylinder with anti-rotation function as claimed in claim 1, characterized in that: The pressing block (8) is connected to the piston rod (4) via a screw (9), and a retaining ring (7) is provided between the pressing block (8) and the piston rod (4).

4. A directional rotating hydraulic cylinder with anti-rotation function as claimed in claim 1, characterized in that: The open end of the cylinder barrel (1) is provided with a guide sleeve (5) for use with the piston rod (4), and a pressure ring (6) is provided outside the guide sleeve (5).

5. A directional rotating hydraulic cylinder with anti-rotation function as claimed in claim 1, characterized in that: One end of the guide rod (3) is connected to the cylinder barrel (1) via a pin (2).

6. A directional rotating hydraulic cylinder with anti-rotation function as claimed in claim 1, characterized in that: A sealing device is provided between the guide rod (3), the cylinder barrel (1) and the piston rod (4).

7. A directional rotary hydraulic cylinder with anti-rotation function as claimed in claim 1, characterized in that: The positioning knob (12) is installed on the piston end of the piston rod (4) via a thread, and the steel ball (11) is gap-matched with the inner ball wall of the positioning knob (12).

8. A directional rotating hydraulic cylinder with anti-rotation function as claimed in claim 1, characterized in that: The U-shaped track groove is designed according to the actual installation space and the requirements of the rising rotation angle of the working condition, and includes a rotating curve segment and straight segments at the front and rear ends of the curve segment.

9. A directional rotating hydraulic cylinder with anti-rotation function as claimed in claim 1, characterized in that: The cylinder barrel (1) is provided with a blind hole for installing a hydraulically controlled one-way valve (13), and the hydraulically controlled one-way valve (13) is fixed to the cylinder barrel (1) via threads.

10. A method for using the directional rotary hydraulic cylinder with anti-rotation function according to claim 1, characterized in that: The steps include: S1, the rodless chamber of the cylinder (1) is supplied with oil from the oil port A; S2, the piston rod (4) drives the steel ball (11) to rise vertically along the U-shaped track groove on the guide rod (3) in the track direction until the pressure block (8) leaves the narrow space; S3, after the pressing block (8) leaves the narrow space, the steel ball (11) enters the set spiral track under the dual effects of the hydraulic cylinder thrust and the weight of the steel ball (11), and the piston rod (4) continues to drive the steel ball to rotate and rise along the set guide rod spiral groove; S4, when the pressing block (8) reaches the predetermined position and angle, it rises straight along the U-shaped groove to the predetermined position; S5, oil enters port B, the piston rod (4) moves back along the U-shaped track groove and is then pressed and fixed, and the hydraulically controlled non-return valve (13) is locked; S6. After the work is completed, oil enters the oil port A, the hydraulically controlled non-return valve (13) opens, and the piston rod (4) rises slightly vertically along the U-shaped groove at the end; S7, oil is supplied from port B, the piston rod (4) first falls straight down along the U-shaped groove track, then rotates along the track U-shaped groove to a predetermined direction, and then falls back along the straight U-shaped groove until the piston rod (4) is completely retracted, and the work is completed.

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