Bidirectional oil cylinder

Abstract

The utility model discloses a bidirectional oil cylinder, and belongs to the technical field of hydraulic oil cylinders. Comprising a lower oil cylinder and an upper oil cylinder, the lower oil cylinder and the upper oil cylinder are reversely and fixedly connected through a mounting block, the upper oil cylinder comprises an upper piston rod and an upper cylinder barrel, and the upper piston rod is inserted into the upper cylinder barrel through the end of the upper cylinder barrel; the lower oil cylinder comprises a lower piston rod and a lower cylinder barrel, and the lower piston rod is inserted into the lower cylinder barrel through the end of the lower cylinder barrel. According to the two-way oil cylinder, the two oil cylinders are reversely arranged, the two hydraulic cylinders are reversely installed, the stroke which is double of that of a common oil cylinder is achieved, the two oil cylinders are reversely fixed into a whole, the two-way oil cylinder can be applied to small-space occasions, large-stroke movement can be achieved, and the two-way oil cylinder is convenient to use. The two-way oil cylinder can meet various movement requirements under multiple working conditions.

Description

Technical Field

[0001] This utility model relates to a two-way hydraulic cylinder, belonging to the field of hydraulic cylinder technology. Background Technology

[0002] Currently, the known stroke of a hydraulic cylinder is fixed. To achieve a long stroke, the only options are to increase the length of the cylinder barrel and piston rod or to temporarily fix and splice multiple hydraulic cylinders together. However, both of these methods have drawbacks. When the space reserved in the working environment is insufficient, the cylinder with increased cylinder barrel and piston rod length is prone to bending when achieving a long stroke. Temporarily fixing and splicing multiple hydraulic cylinders together requires a lot of space. Therefore, conventional hydraulic cylinders are not easy to meet the needs of various movements in space-constrained working conditions. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a two-way hydraulic cylinder, which solves the problem that conventional hydraulic cylinders are not easy to handle the needs of various movements under space-constrained working conditions.

[0004] The technical problem to be solved by this utility model is achieved by the following technical solution: a bidirectional oil cylinder, including a lower oil cylinder and an upper oil cylinder, the lower oil cylinder and the upper oil cylinder are fixedly connected in opposite directions by a mounting block, the upper oil cylinder includes an upper piston rod and an upper cylinder barrel, the upper piston rod is inserted into the upper cylinder barrel through the end of the upper cylinder barrel;

[0005] The lower cylinder includes a lower piston rod and a lower cylinder barrel, with the lower piston rod inserted into the lower cylinder barrel through the end of the lower cylinder barrel.

[0006] An oil supply section for transmitting oil is provided between the upper cylinder and the lower cylinder. A main connecting block is fixedly provided at the end of the lower piston rod away from the lower cylinder, and an oil port communicating with the lower cylinder is opened in the main connecting block.

[0007] External support plates are provided on the opposite surfaces of the main connecting block. The ends of the two external support plates away from the main connecting block are bent outward to form connecting flanges. The external support plates are provided with fixing parts for fixing the external support plates.

[0008] By adopting the above technical solution, and by setting two hydraulic cylinders in opposite directions and installing them in reverse, a stroke twice that of a normal hydraulic cylinder is achieved. This design of fixing two hydraulic cylinders in opposite directions as one unit enables the bidirectional hydraulic cylinder to be used in small spaces and to achieve a large stroke, allowing the bidirectional hydraulic cylinder to meet various motion requirements under multiple working conditions.

[0009] The present invention is further configured such that: the oil supply unit includes a plurality of oil pipes disposed between the lower oil cylinder and the upper oil cylinder, and a connector body is provided between adjacent oil pipes; the plurality of oil pipes and the connector body form an oil pipe group; and the oil pipe group is respectively connected to the upper cylinder and the lower cylinder.

[0010] By adopting the above technical solution, only one set of oil pipes is needed, which is connected to the upper cylinder and the lower cylinder respectively, simplifying the pipeline layout and reducing the risk of leakage.

[0011] The present invention is further configured such that the fixing part includes:

[0012] The first movable plate is fitted onto an external support plate.

[0013] The second movable plate is fitted onto another external support plate, with the opposite ends of the first and second movable plates abutting against each other.

[0014] Oil inlets are respectively located in the first and second movable plates.

[0015] The connector components are respectively disposed on the side of the first movable plate and the second movable plate facing the oil port. The connector components are used to connect the oil inlet hole and the oil port.

[0016] Fastening components are respectively installed on the first movable plate and the second movable plate. The fastening components are used to fix the external support plate, the first movable plate, and the second movable plate.

[0017] The first and second movable plates can abut against the connecting flange. The connecting flange and the first movable plate, as well as the connecting flange and the second movable plate, are both provided with threaded holes. The fastening components are either separable fastening components or abutment fastening components.

[0018] The present invention is further configured such that the joint component includes:

[0019] The fixed connector pipe is fixed to the first movable plate and the second movable plate respectively and is connected to the oil inlet hole.

[0020] The movable joint pipe is sleeved on the side of the fixed joint pipe away from the movable joint pipe, and the movable joint pipe slides along the axial direction of the fixed joint pipe. The connection between the movable joint pipe and the fixed joint pipe is sealed, and the end of the movable joint pipe away from the fixed joint pipe can be threaded to the oil port.

[0021] The movable cavity is formed along the circumference of the movable joint pipe on the inner wall of the movable joint pipe.

[0022] The limiting block is slidably set in the movable cavity. The limiting block is fixedly connected to the fixed joint pipe, and the connection between the movable cavity and the limiting block is sealed.

[0023] The present invention is further configured such that: the fastening member is a detachable fastening member, and the detachable fastening member includes:

[0024] The sealing bolts are threaded into the connecting threaded holes located on the first and second movable plates.

[0025] The support bolt has its threads set in the threaded hole located on the connecting flange, and the opposite ends of the sealing bolt and the support bolt abut against each other.

[0026] The present invention is further configured such that: the fastening member is an abutment-type fastening member, and the abutment-type fastening member includes:

[0027] The connecting post is threaded in the connecting threaded hole. The connecting post connects the connecting flange to the first movable plate and the connecting flange to the second movable plate. The end of the connecting post extends to the side of the connecting flange away from the main connecting block.

[0028] By adopting the above technical solution, when the bidirectional hydraulic cylinder is installed on the mounting surface with threaded holes, the positions of the first and second movable plates are adjusted so that the first and second movable plates abut against the connecting flange respectively. Then, the connecting column is screwed into the connecting threaded hole, and finally the end of the connecting column is screwed into the threaded hole on the mounting surface, thus completing the fixation of the external support plate to the mounting surface. Since the external support plate is connected to the main connecting block and there is a gap between the first and second movable plates and the oil port, the oil port can be connected to the external oil supply pipeline. At this time, the bidirectional hydraulic cylinder is in the installed state. When the double-acting hydraulic cylinder is installed in a position such as a strip plate, the strip plate is aligned with the main connecting block, ensuring the strip plate does not obstruct the oil port. Then, the external support plate is installed and fixed to the main connecting block. At this point, the strip plate is positioned between the first movable plate and the main connecting block. First, the sealing bolt is screwed into the threaded holes on the first and second movable plates. Then, the support bolt is screwed into the threaded holes on the connecting flange, causing the support bolt to abut against the sealing bolt. Continue rotating the support bolt; under the action of the threaded structure, the support bolt moves towards the main connecting block, thereby securing the first movable plate through the sealing bolt. The first and second movable plates are pushed towards the main connecting block, thereby pressing and fixing the strip plate to the main connecting block. At this time, the movable joint pipe is aligned with the oil port. Then, the movable joint pipe is slid so that its end abuts against the oil port. Then, the movable joint pipe is rotated to connect with the oil port via a thread, thus completing the connection between the fixed joint pipe and the oil port. At this point, after the external oil supply line is connected to the oil inlet, the oil can be sequentially transmitted to the lower cylinder through the oil inlet, fixed joint pipe, movable joint pipe, and oil port. The bidirectional hydraulic cylinder is now in the installed state. This improves the installation adaptability of the bidirectional hydraulic cylinder, allowing the cylinder to select the appropriate installation method according to the actual working conditions, maximizing the ability of the bidirectional hydraulic cylinder to meet various motion requirements.

[0029] The present invention is further configured such that: a pre-made threaded hole is provided on the surface where the main connecting block is installed with the external support plate, and a bolt connector is rotatably connected inside the external support plate, the end of the bolt connector extending into the pre-made threaded hole and threadedly connected to the pre-made threaded hole.

[0030] By adopting the above technical solution, the external support plate can be disassembled when it is not needed. The external support plate can be separated from the main connecting block by unscrewing the bolt connector out of the pre-drilled threaded hole. The disassembly is convenient and quick, which improves the ease of use of the two-way hydraulic cylinder.

[0031] The present invention is further configured such that: a second connecting block is fixedly provided at the end of the upper piston rod away from the upper cylinder, a third connecting block is fixedly provided at the end of the upper cylinder away from the upper piston rod, and a first connecting block is fixedly provided at the end of the lower cylinder away from the lower piston rod.

[0032] By adopting the above technical solution, multiple fixed points are set on the hydraulic cylinder, and the appropriate fixed point can be selected according to the actual stroke, which further improves the ability of the bidirectional hydraulic cylinder to cope with various motion requirements.

[0033] The beneficial effects of this utility model are: by setting two oil cylinders in opposite directions and installing them in reverse, the stroke of the two oil cylinders is doubled compared to that of a general oil cylinder. This design of fixing two oil cylinders in opposite directions as one unit enables the bidirectional oil cylinder to be used in small spaces and to achieve a large stroke movement, so that the bidirectional oil cylinder can meet a variety of motion requirements under multiple working conditions. Attached Figure Description

[0034] Figure 1 This is a cross-sectional view of the structure of this utility model from the front view;

[0035] Figure 2 This is a top view of the structure of this utility model;

[0036] Figure 3 This is a structural diagram of the fixing part of this utility model when a detachable fastening component is used;

[0037] Figure 4 This is a structural diagram of the fixing part of this utility model when an abutment-type fastening component is used;

[0038] Figure 5 This is a cross-sectional view of the connection between the fixed joint pipe and the movable joint pipe in this utility model.

[0039] In the diagram: 1. Lower cylinder; 2. Upper cylinder; 3. Mounting block; 4. Upper piston rod; 5. Upper cylinder barrel; 6. Oil port; 7. Connector body; 8. Lower piston rod; 9. Lower cylinder barrel; 10. Oil pipe; 11. Upper sealing end cap; 12. Lower sealing end cap; 13. First connecting block; 14. Second connecting block; 15. Third connecting block; 16. Main connecting block; 17. Pre-drilled threaded hole; 18. External support plate; 19. Bolt connector; 20. First movable plate; 21. Second movable plate; 22. Oil inlet; 23. Fixed connector pipe; 24. Movable connector pipe; 25. Movable cavity; 26. Limiting block; 27. Strip plate; 28. Mounting surface; 30. Sealing bolt; 31. Support bolt; 32. Connecting column; 33. Connecting threaded hole. Detailed Implementation

[0040] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this utility model, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0041] like Figure 1-2 As shown, a bidirectional hydraulic cylinder includes a lower hydraulic cylinder 1 and an upper hydraulic cylinder 2, which are fixedly connected in opposite directions by a mounting block 3. The upper hydraulic cylinder 2 includes an upper piston rod 4 and an upper cylinder 5. The upper piston rod 4 is inserted into the upper cylinder 5 through its end. An upper sealing end cap 11 is provided between the outer side of the upper piston rod 4 and the inner side of the upper cylinder 5, sealing the upper cylinder 5. The lower hydraulic cylinder 1 includes a lower piston rod 8 and a lower cylinder 9, which is inserted into the lower cylinder 9 through its end. A lower sealing end cap 12 is provided between the outer side of the lower piston rod 8 and the inner side of the lower cylinder 9, sealing the lower cylinder 9. An oil supply section for transmitting oil is provided between the upper cylinder 5 and the lower cylinder 9. A main connecting block 16 is fixedly provided at the end of the lower piston rod 8 away from the lower cylinder 9, and an oil port 6 communicating with the lower cylinder 9 is provided in the main connecting block 16. A reverse fixed connection means that the upper piston rod 4 and the lower piston rod 8 in the lower cylinder 1 and the upper cylinder 2 move in opposite directions when they extend.

[0042] like Figure 2-3 As shown, an external support plate 18 is provided on the opposite surface of the main connecting block 16. A pre-drilled threaded hole 17 is provided on the surface of the main connecting block 16 where the external support plate 18 is installed. A bolt connector 19 is rotatably connected inside the external support plate 18. The end of the bolt connector 19 extends into the pre-drilled threaded hole 17 and is threadedly connected to the pre-drilled threaded hole 17. The ends of the two external support plates 18 away from the main connecting block 16 are bent outward to form a connecting flange. A fixing part for fixing the external support plate 18 is provided on the external support plate 18.

[0043] like Figure 1As shown, the oil supply unit includes several oil pipes 10 disposed between the lower oil cylinder 1 and the upper oil cylinder 2. Adjacent oil pipes 10 are connected by connectors 7, forming an oil pipe group. This oil pipe group is connected to both the upper cylinder 5 and the lower cylinder 9. By providing an oil pipe group that connects to both the upper cylinder 5 and the lower cylinder 9, the pipeline layout is simplified, and the risk of leakage is reduced.

[0044] like Figure 3-4 As shown, the fixing part includes a first movable plate 20, a second movable plate 21, an oil inlet hole 22, a connector component, and a fastening component. The first movable plate 20 is sleeved on an external support plate 18, and the second movable plate 21 is sleeved on another external support plate 18. The opposite ends of the first movable plate 20 and the second movable plate 21 abut against each other. The opposite ends of the first movable plate 20 and the second movable plate 21 can be configured as a stepped structure that can be spliced ​​together to form a complete rectangle. The oil inlet hole 22 is respectively opened in the first movable plate 20 and the second movable plate 21. The connector component is respectively disposed on the side of the first movable plate 20 and the second movable plate 21 facing the oil port 6, and the connector component is used to connect the oil inlet hole 22 to the oil port 6. The first movable plate 20 and the second movable plate 21 can abut against the connecting flange. Connecting threaded holes 33 are aligned and pass through both the connecting flange and the first movable plate 20, as well as the connecting flange and the second movable plate 21. Fastening components are respectively disposed on the first movable plate 20 and the second movable plate 21. The fastening components fix the external support plate 18, the first movable plate 20, and the second movable plate 21 through the connecting threaded holes 33, and simultaneously fix the external support plate 18 to the external mounting surface 28 or the strip plate 27. Depending on the installation position, the fastening components can be either separate fastening components or abutment fastening components.

[0045] like Figure 3 and Figure 5 As shown, the connector components include a fixed connector tube 23, a movable connector tube 24, a movable cavity 25, and a limiting block 26. The fixed connector tube 23 is fixed on the first movable plate 20 and the second movable plate 21 respectively and communicates with the oil inlet hole 22. The movable connector tube 24 is sleeved on the side of the fixed connector tube 23 away from the fixed connector tube 23 and slides along the axial direction of the fixed connector tube 23. The connection between the movable connector tube 24 and the fixed connector tube 23 is sealed. The end of the movable connector tube 24 away from the fixed connector tube 23 can be threaded to the oil port 6. After the movable connector tube 24 is threaded to the oil port 6, the connection is sealed. The movable cavity 25 is opened circumferentially on the inner wall of the movable connector tube 24. The limiting block 26 is slidably disposed in the movable cavity 25 and is fixedly connected to the fixed connector tube 23. The connection between the movable cavity 25 and the limiting block 26 is sealed. The fixed connector tube 23 and the movable connector tube 24 can rotate relative to each other.

[0046] like Figure 3-4As shown, when the external support plate 18 needs to be installed on the strip plate 27, the fastening component is a detachable fastening component, which includes a sealing bolt 30 and a support bolt 31. The sealing bolt 30 is threaded in the connecting threaded hole 33 located on the first movable plate 20 and the second movable plate 21, and the support bolt 31 is threaded in the connecting threaded hole 33 located on the connecting flange. The opposite ends of the sealing bolt 30 and the support bolt 31 abut against each other, and the first movable plate 20 and the second movable plate 21 are spaced apart from the connecting flange. When the external support plate 18 needs to be installed on the planar mounting surface 28, the connecting flange abuts against the first movable plate 20 and the second movable plate 21, respectively. The fastening component is an abutment type fastening component, which includes a connecting post 32. The connecting post 32 is threaded in the connecting threaded hole 33. The connecting post 32 connects the connecting flange to the first movable plate 20 and the connecting flange to the second movable plate 21. The end of the connecting post 32 extends to the side of the connecting flange away from the main connecting block 16.

[0047] like Figure 1-2 As shown, a second connecting block 14 is fixedly installed at the end of the upper piston rod 4 away from the upper cylinder 5, a third connecting block 15 is fixedly installed at the end of the upper cylinder 5 away from the upper piston rod 4, and a first connecting block 13 is fixedly installed at the end of the lower cylinder 9 away from the lower piston rod 8.

[0048] By reversing the two hydraulic cylinders and installing them in the opposite direction, a stroke twice that of a typical hydraulic cylinder is achieved. This design, which fixes the two cylinders in reverse as one unit, enables the bidirectional hydraulic cylinder to be used in confined spaces and achieves a large stroke, allowing it to meet various motion requirements under multiple working conditions.

[0049] When the bidirectional hydraulic cylinder is installed on the mounting surface 28 with threaded holes, the positions of the first movable plate 20 and the second movable plate 21 are adjusted so that the first movable plate 20 and the second movable plate 21 abut against the connecting flange respectively. Then, the connecting column 32 is screwed into the connecting threaded hole 33, and finally the end of the connecting column 32 is screwed into the threaded hole on the mounting surface 28, thus completing the fixation of the external support plate 18 to the mounting surface 28. Since the external support plate 18 is connected to the main connecting block 16 and there is a gap between the first movable plate 20 and the second movable plate 21 and the oil port 6, the oil port 6 can be connected to the external oil supply pipeline. At this time, the bidirectional hydraulic cylinder is in the installed state.

[0050] When the bidirectional hydraulic cylinder is installed at the position of the strip plate 27, the strip plate 27 is attached to the main connecting block 16, and the strip plate 27 does not block the oil port 6. Then, the external support plate 18 is installed and fixed to the main connecting block 16. At this time, the strip plate 27 is located between the first movable plate 20 and the main connecting block 16. First, the sealing bolt 30 is screwed into the connecting threaded hole 33 on the first movable plate 20 and the second movable plate 21. Then, the support bolt 31 is screwed into the connecting threaded hole 33 on the connecting flange, so that the support bolt 31 abuts against the sealing bolt 30. Then, the support bolt 31 is rotated. Under the action of the threaded structure, the support bolt 31 moves towards the main connecting block 16, thereby pushing the first movable plate 20 and the second movable plate 21 towards the main connecting block 16 through the sealing bolt 30. In this way, the first movable plate 20 and the second movable plate 21 press and fix the strip plate 27 and the main connecting block 16, and fix the external support plate 18 to the strip plate 27. At this point, the movable connector tube 24 is aligned with the oil port 6. Then, the movable connector tube 24 is slid so that its end abuts against the oil port 6. Next, the movable connector tube 24 is rotated to thread it into the oil port 6, thus completing the connection between the fixed connector tube 23 and the oil port 6. With the external oil supply line now connected to the oil inlet 22, oil can be sequentially transferred through the oil inlet 22, the fixed connector tube 23, the movable connector tube 24, and the oil port 6 to the lower cylinder 9. At this point, the bidirectional hydraulic cylinder is fully installed. This improves the installation adaptability of the bidirectional hydraulic cylinder, allowing the cylinder to select the appropriate installation method according to actual working conditions, maximizing its ability to meet various motion requirements.

[0051] When the external support plate 18 is not needed, it can be disassembled. Separation of the external support plate 18 from the main connecting block 16 is achieved by unscrewing the bolt connector 19 out of the pre-drilled threaded hole 17. This quick and easy disassembly improves the usability of the bidirectional hydraulic cylinder. Furthermore, multiple fixing points are provided on the cylinder, allowing selection of appropriate fixing points based on the actual stroke, further enhancing the bidirectional hydraulic cylinder's ability to handle various motion requirements.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A bidirectional oil cylinder comprising a lower oil cylinder (1) and an upper oil cylinder (2), the lower oil cylinder (1) and the upper oil cylinder (2) being reversely fixedly connected through a mounting block (3), characterized in that: The upper cylinder (2) includes an upper piston rod (4) and an upper cylinder (5), and the upper piston rod (4) is inserted into the upper cylinder (5) through the end of the upper cylinder (5); The lower cylinder (1) includes a lower piston rod (8) and a lower cylinder (9), and the lower piston rod (8) is inserted into the lower cylinder (9) through the end of the lower cylinder (9); An oil supply section for transmitting oil is provided between the upper cylinder (5) and the lower cylinder (9). A main connecting block (16) is fixedly provided at the end of the lower piston rod (8) away from the lower cylinder (9). An oil port (6) communicating with the lower cylinder (9) is opened in the main connecting block (16). An external support plate (18) is provided on the opposite surface of the main connecting block (16). The two external support plates (18) are bent outward at the ends away from the main connecting block (16) to form a connecting flange. A fixing part for fixing the external support plate (18) is provided on the external support plate (18).

2. A bidirectional oil cylinder according to claim 1, characterized in that: The oil supply unit includes several oil pipes (10) disposed between the lower oil cylinder (1) and the upper oil cylinder (2). Adjacent oil pipes (10) are connected by a connector body (7). The several oil pipes (10) and the connector body (7) form an oil pipe group. The oil pipe group is connected to the upper cylinder (5) and the lower cylinder (9) respectively.

3. The bidirectional oil cylinder of claim 1, wherein: The fixing part includes: The first movable plate (20) is fitted onto an external support plate (18). The second movable plate (21) is fitted onto another external support plate (18), and the opposite ends of the first movable plate (20) and the second movable plate (21) abut against each other. Oil inlet holes (22) are respectively opened in the first movable plate (20) and the second movable plate (21). The connector components are respectively disposed on the side of the first movable plate (20) and the second movable plate (21) facing the oil port (6). The connector components are used to connect the oil inlet (22) and the oil port (6). Fastening components are respectively installed on the first movable plate (20) and the second movable plate (21). The fastening components are used to fix the external support plate (18), the first movable plate (20) and the second movable plate (21). The first movable plate (20) and the second movable plate (21) can abut against the connecting flange. The connecting flange and the first movable plate (20) and the connecting flange and the second movable plate (21) are both provided with connecting threaded holes (33) aligned and passing through. The fastening component is a separate fastening component or an abutment fastening component.

4. A bidirectional oil cylinder according to claim 3, characterized in that: The joint components include: The fixed connector pipe (23) is fixed on the first movable plate (20) and the second movable plate (21) respectively and communicates with the oil inlet hole (22). The movable joint pipe (24) is sleeved on the side of the fixed joint pipe (23) away from the movable joint pipe (24), and the movable joint pipe (24) slides along the axial direction of the fixed joint pipe (23). The connection between the movable joint pipe (24) and the fixed joint pipe (23) is sealed. The end of the movable joint pipe (24) away from the fixed joint pipe (23) can be threaded to the oil port (6). The movable cavity (25) is formed circumferentially on the inner wall of the movable joint tube (24). The limiting block (26) is slidably set in the movable cavity (25). The limiting block (26) is fixedly connected to the fixed connector tube (23), and the connection between the movable cavity (25) and the limiting block (26) is sealed.

5. A bidirectional oil cylinder according to claim 3, characterized in that: The fastening component is a detachable fastening component, which includes: The sealing bolt (30) is threaded in the connecting threaded hole (33) located on the first movable plate (20) and the second movable plate (21). The support bolt (31) is threaded in the connecting threaded hole (33) located on the connecting flange, and the opposite ends of the sealing bolt (30) and the support bolt (31) abut against each other.

6. A double acting ram as claimed in claim 3 wherein: The fastening component is a butt-fitting fastening component, which includes: The connecting post (32) is threaded in the connecting threaded hole (33). The connecting post (32) connects the connecting flange to the first movable plate (20) and the connecting flange to the second movable plate (21). The end of the connecting post (32) extends to the side of the connecting flange away from the main connecting block (16).

7. The bidirectional oil cylinder of claim 1, wherein: The main connecting block (16) has a pre-made threaded hole (17) on the side where the external support plate (18) is installed. A bolt connector (19) is rotatably connected inside the external support plate (18). The end of the bolt connector (19) extends into the pre-made threaded hole (17) and is threadedly connected to the pre-made threaded hole (17).

8. The bidirectional oil cylinder of claim 1, wherein: A second connecting block (14) is fixedly provided at the end of the upper piston rod (4) away from the upper cylinder (5), a third connecting block (15) is fixedly provided at the end of the upper cylinder (5) away from the upper piston rod (4), and a first connecting block (13) is fixedly provided at the end of the lower cylinder (9) away from the lower piston rod (8).

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