A hydraulic cylinder with a dual piston rod balanced drive structure

Abstract

This utility model discloses a hydraulic cylinder with a dual-piston rod balanced drive structure, including a cylinder body. A left piston assembly and a right piston assembly are symmetrically slidably connected inside the cylinder body. A left connecting seat is installed on the left side of the outer wall of the left piston assembly, and a right connecting seat is installed on the right side of the outer wall of the right piston assembly. Connecting frames are fixedly connected to both sides of the outer wall of the cylinder body, and gears are rotatably connected inside the connecting frames. A rack plate one and a rack plate two are symmetrically arranged on both sides of the outer wall of the gears. This utility model connects the right connecting seat with rack plate one and the left connecting seat with rack plate two. The gears mesh with rack plates one and two, ensuring symmetrical bidirectional sliding of the left and right piston assemblies during movement, thus guaranteeing the balance of their movement. Furthermore, by setting three sets of simple pressure relief components, automatic oil discharge and pressure relief are achieved, preventing hydraulic failures and facilitating later maintenance.

Description

Technical Field

[0001] This utility model relates to the field of double piston rod hydraulic cylinders, and in particular to a hydraulic cylinder with a double piston rod balanced drive structure. Background Technology

[0002] A double-piston rod hydraulic cylinder is a hydraulic actuator with a special structure. Its core feature is that piston rods extend symmetrically from both sides of the piston. Through a bidirectional equal-area oil chamber design, it achieves bidirectional equal force output and constant speed motion, making it suitable for industrial scenarios that require high precision, high rigidity, and resistance to off-center loads.

[0003] While dual-piston rod hydraulic cylinders can achieve symmetrical piston rod extension to both sides during use, simply having bidirectional equal-area oil chambers and two piston rods of the same diameter and length does not fully guarantee bidirectional balanced symmetrical movement. Therefore, it cannot be fully ensured that the dual-piston rod hydraulic cylinder can achieve a balanced drive effect. In addition, the pressure relief device of existing cylinders has a complex structure, is costly, and is inconvenient for later maintenance and upkeep.

[0004] In view of this, we have studied and improved the existing structure and its shortcomings, and proposed a hydraulic cylinder with a dual piston rod balanced drive structure that is easy to use and maintain. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this invention is to provide a hydraulic cylinder with a dual-piston rod balanced drive structure.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a hydraulic cylinder with a dual-piston rod balanced drive structure, comprising a cylinder body, with a left end cap and a right end cap installed at both ends of the cylinder body. An oil pipe I and two oil pipes II are fixedly connected inside the cylinder body. The oil pipe I is located in the middle of the cylinder body's interior, and the two oil pipes II are located on both sides of the cylinder body's interior. A left piston assembly and a right piston assembly are symmetrically slidably connected inside the cylinder body. A left connecting seat is installed on the left side of the outer wall of the left piston assembly, and a right connecting seat is installed on the right side of the outer wall of the right piston assembly. The outer wall of the cylinder body... Connecting frames are fixedly connected to both sides. Gears are rotatably connected inside the connecting frames. A slider is slidably connected inside the connecting frames. A rack plate is fixedly connected to the lower surface of the slider. The rack plate meshes with the gear. The right end of the rack plate is installed inside the right connecting seat. A slider is slidably connected inside the connecting frames. A rack plate is fixedly connected to the upper surface of the slider. The rack plate meshes with the gear. The left end of the rack plate is installed inside the left connecting seat. The rack plate and rack plate are symmetrically arranged on both sides of the outer wall of the gear.

[0007] Furthermore, the left piston assembly consists of a rod and a piston plate, and the right piston assembly consists of a rod and a piston plate.

[0008] Furthermore, a left insert block is fixedly connected to the left side of the outer wall of the cylinder, and the left insert block is slidably connected to the inside of the left end cover. The rod part of the left piston assembly is slidably connected to the inside of the left end cover.

[0009] Furthermore, the left insert block is connected to the left end cover by internal threads with bolts, and a sealing ring is placed between the left end cover and the cylinder body.

[0010] Furthermore, a right insert block is fixedly connected to the right side of the outer wall of the cylinder, and the right insert block is slidably connected to the inside of the right end cover. The rod part of the right piston assembly is slidably connected to the inside of the right end cover.

[0011] Furthermore, the right insert block is connected to the right end cover by internal threads with bolts, and a sealing ring is placed between the right end cover and the cylinder body.

[0012] Furthermore, the left end of the left piston assembly is slidably connected to the inside of the left connecting seat, and the left piston assembly and the left connecting seat are fixedly connected by bolts and nuts. The left end of the rack plate II is fixedly connected to the left connecting seat by bolts and nuts. A groove I is provided inside the left piston assembly.

[0013] Furthermore, the right end of the right piston assembly is slidably connected to the inside of the right connecting seat, and the right piston assembly and the right connecting seat are fixedly connected by bolts and nuts. The right end of the rack plate is fixedly connected to the right connecting seat by bolts and nuts. The right piston assembly has a second groove inside.

[0014] Furthermore, the cylinder body is equipped with three sets of pressure relief components. Each pressure relief component includes an oil drain pipe, which is fixedly connected to the inside of the cylinder body. A knob sleeve is threadedly connected to the outer wall of the oil drain pipe, and a valve core is slidably connected to the inside of the oil drain pipe.

[0015] Furthermore, a slide rod is fixedly connected to the lower end of the valve core, the lower end of the slide rod is in contact with the inner wall of the knob sleeve, a spring is sleeved on the outer wall of the slide rod, one end of the spring is fixedly connected to the inside of the valve core, the other end of the spring is in contact with the inner wall of the knob sleeve, and an oil drain pipe is fixedly connected to the inside of the drain pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Rack plate one and rack plate two are symmetrically arranged on the outer wall of the gear. Hydraulic oil enters the cylinder through oil pipe one and pushes the left piston assembly and the right piston assembly to both sides respectively. During the movement, the left piston assembly and the right piston assembly drive the left connecting seat and the right connecting seat to move respectively. Since the left connecting seat is connected to rack plate two and the right connecting seat is connected to rack plate one, and rack plate one and rack plate two are symmetrically arranged on both sides of the outer wall of the gear, it is ensured that the left piston assembly and the right piston assembly slide symmetrically in both directions during the movement, thus ensuring the balance of the movement of the left piston assembly and the right piston assembly.

[0017] 2. By setting a detachable connecting seat and rack plate, when the left piston assembly and the right piston assembly need to slide in the same direction, the bolts between the left connecting seat and the second rack plate, or the bolts between the right connecting seat and the first rack plate, can be removed. This allows the left piston assembly and the right piston assembly to move to the left or to the right in the same direction without being affected by the synchronous movement of the gear, rack plate one, and rack plate two. This not only enables symmetrical bidirectional balanced movement of the left piston assembly and the right piston assembly, but also enables the left piston assembly and the right piston assembly to move to the left or to the right in the same direction, improving the practicality of the hydraulic cylinder and allowing for flexible adjustment according to different usage scenarios.

[0018] 3. By setting three sets of pressure relief components, automatic oil discharge and pressure relief can be achieved when the internal pressure of the cylinder is too high. Before use, rotate the knob sleeve to move it down a certain distance. When the internal pressure of the cylinder is too high, hydraulic oil will enter the oil drain pipe, and then push the valve core and knob sleeve down, so that the hydraulic oil can be discharged through the oil drain pipe. After the pressure decreases, the spring drives the valve core and knob sleeve to reset, so that the valve core position is higher than the oil drain pipe, thus realizing automatic oil discharge and pressure relief. This structure is simple, can avoid hydraulic failure, and is also convenient for later maintenance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram showing the assembly of the cylinder body, left end cover, and right end cover of this utility model. Figure 3 This is a schematic diagram showing the connection between the gear and rack plate one and rack plate two of this utility model; Figure 4 This is a schematic diagram of the structure of the left piston assembly and the right piston assembly of this utility model; Figure 5 This is a schematic diagram of the pressure relief component of this utility model.

[0020] Legend: 1. Cylinder block; 101. Left end cover; 102. Right end cover; 103. Oil pipe one; 104. Oil pipe two; 105. Left insert block; 106. Right insert block; 107. Sealing ring one; 108. Sealing ring two; 2. Left piston assembly; 201. Left connecting seat; 202. Groove one; 3. Right piston assembly; 301. Right connecting seat; 302. Groove two; 4. Connecting bracket; 401. Gear; 402. Rack plate one; 403. Slider one; 404. Rack plate two; 405. Slider two; 5. Pressure relief assembly; 501. Oil drain pipe; 502. Knob sleeve; 503. Valve core; 504. Slide rod; 505. Spring; 506. Oil drain pipe. Detailed Implementation

[0021] The technical solutions of the embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0022] Reference Figure 1-5 This embodiment of a hydraulic cylinder with a dual-piston rod balanced drive structure includes a cylinder body 1. A left end cap 101 and a right end cap 102 are installed at both ends of the cylinder body 1. The left end cap 101 is installed on the left side of the cylinder body 1 to seal the left side of the cylinder body 1, and the right end cap 102 is installed on the right side of the cylinder body 1 to seal the right side of the cylinder body 1. An oil pipe 103 and two oil pipes 104 are fixedly connected inside the cylinder body 1. The oil pipe 103 is located in the middle of the inside of the cylinder body 1, and the two oil pipes 104 are symmetrically arranged on both sides of the inside of the cylinder body 1, with the oil pipe 103 located in the middle of the two oil pipes 104. A left piston assembly 2 and a right piston assembly 3 are symmetrically slidably connected inside the cylinder body 1. The left piston assembly 2 is located on the left side of the inside of the cylinder body 1, and the right piston assembly 3 is located on the right side of the inside of the cylinder body 1. A left connecting seat 201 is installed on the left side of the outer wall of the left piston assembly 2, and a right connecting seat 301 is installed on the right side of the outer wall of the right piston assembly 3. Both the left connecting seat 201 and the right connecting seat 301 can be externally connected to objects that need to be moved. Connecting frames 4 are fixedly connected to both sides of the outer wall of the cylinder body 1. Gears 401 are rotatably connected inside the connecting frames 4, and gears 401 are limited to rotate inside the connecting frames 4. A slider 403 is slidably connected inside the connecting frames 4, and slider 403 is limited to slide inside the connecting frames 4. A rack 402 is fixedly connected to the lower surface of slider 403, and rack 402 meshes with gear 401. The right end of rack 402 is installed inside the right connecting seat 301. A slider 405 is slidably connected inside the connecting frames 4. The limiting slide is inside the connecting frame 4. The upper surface of the slider 2 405 is fixedly connected to the rack plate 2 404. The rack plate 2 404 meshes with the gear 401. The left end of the rack plate 2 404 is installed inside the left connecting seat 201. The rack plate 1 402 and the rack plate 2 404 are symmetrically arranged on both sides of the outer wall of the gear 401. When the rack plate 1 402 slides, it will drive the gear 401 to rotate. The rotation of the gear 401 will drive the rack plate 2 404 to slide. Since the rack plate 1 402 and the rack plate 2 404 are symmetrically arranged on both sides of the outer wall of the gear 401, the rack plate 1 402 can drive the rack plate 2 404 to slide an equal distance while sliding, thereby ensuring that the left piston assembly 2 and the right piston assembly 3 can maintain bidirectional synchronous and balanced sliding when sliding in both directions.

[0023] Specifically, in the above design, oil is added to the inside of the cylinder 1 through oil pipe 103, which causes the hydraulic oil to enter between the left piston assembly 2 and the right piston assembly 3. The oil inlet process pushes the left piston assembly 2 and the right piston assembly 3 to both sides. As the left piston assembly 2 slides to the left, it drives the left connecting seat 201 to slide and drives the rack plate 404 to slide. The sliding of the rack plate 404 causes the gear 401 to rotate, which in turn drives the rack plate 402 to slide synchronously. The rack plate 402 drives the right connecting seat 301 and the right piston assembly 3 to slide, ensuring that the left piston assembly 2 and the right piston assembly 3 move in a balanced and symmetrical manner when sliding to both sides.

[0024] Reference Figure 2 In this embodiment, the left piston assembly 2 is composed of a rod and a piston plate, and the right piston assembly 3 is composed of a rod and a piston plate. The piston plate of the left piston assembly 2 is located on the left side inside the cylinder 1 and slides in a sealed manner inside the cylinder 1. The piston plate of the right piston assembly 3 is located on the right side inside the cylinder 1 and slides in a sealed manner inside the cylinder 1. The two piston plates are symmetrically arranged.

[0025] Reference Figure 2A left insert block 105 is fixedly connected to the left side of the outer wall of the cylinder body 1. The left insert block 105 is slidably connected to the inside of the left end cover 101. The left insert block 105 is limited and locked inside the left end cover 101. In this embodiment, there are two left insert blocks 105. The two left insert blocks 105 are limited and locked inside the left end cover 101. The rod part of the left piston assembly 2 slides inside the left end cover 101, and the connection between the rod part of the left piston assembly 2 and the left end cover 101 is sealed.

[0026] Reference Figure 2 The left insert 105 is connected to the left end cover 101 by a bolt with internal threads. A sealing ring 107 is placed between the left end cover 101 and the cylinder body 1. In this embodiment, the two left inserts 105 are respectively limited and fixed inside the left end cover 101 by two bolts. The connection between the left end cover 101 and the cylinder body 1 is sealed by the sealing ring 107. The left end cover 101 is sealed and installed on the left end of the cylinder body 1 to facilitate disassembly work during subsequent maintenance or cleaning of the hydraulic cylinder.

[0027] Reference Figure 2 A right insert block 106 is fixedly connected to the right side of the outer wall of the cylinder body 1. The right insert block 106 is slidably connected to the inside of the right end cover 102. The rod part of the right piston assembly 3 is slidably connected to the inside of the right end cover 102. In this embodiment, there are two right insert blocks 106. The two right insert blocks 106 are limited and locked inside the right end cover 102. The rod part of the right piston assembly 3 is slidably connected to the inside of the right end cover 102, and the connection between the rod of the right piston assembly 3 and the right end cover 102 is sealed.

[0028] Reference Figure 2 The right insert 106 is connected to the right end cover 102 by a bolt with internal threads. A sealing ring 108 is placed between the right end cover 102 and the cylinder body 1. In this embodiment, the two right inserts 106 are respectively limited and fixed inside the right end cover 102 by two bolts, and the connection between the right end cover 102 and the cylinder body 1 is sealed by the sealing ring 108, so that the right end cover 102 is sealed and installed on the right end of the cylinder body 1, which facilitates disassembly work when the hydraulic cylinder is inspected or cleaned.

[0029] Reference Figure 3 and 4The left end of the left piston assembly 2 is slidably connected to the inside of the left connecting seat 201. The left piston assembly 2 and the left connecting seat 201 are fixedly connected by bolts and nuts. The left end of the left piston assembly 2 is limited and fixed inside the left connecting seat 201 by bolts and nuts. The left end of the rack plate 2 404 is fixedly connected to the left connecting seat 201 by bolts and nuts. The left end of the rack plate 2 404 is limited and fixed inside the left connecting seat 201. The left piston assembly 2 has a groove 202 inside. The groove 202 facilitates oil to enter the middle of the cylinder 1 through the oil inlet pipe 103. In this embodiment, the left connecting seat 201 is slidably placed on the outer wall of the left end of the left piston assembly 2. The left connecting seat 201 and the left piston assembly 2 are combined and fixed by bolts and nuts. The left end of the rack plate 2 404 is slidably placed inside the left connecting seat 201 and fixedly connected by bolts and nuts. This facilitates subsequent disassembly and allows the left piston assembly 2 to slide in the same direction as the right piston assembly 3.

[0030] Reference Figure 3 and 4 The right end of the right piston assembly 3 is slidably connected to the inside of the right connecting seat 301. The right piston assembly 3 and the right connecting seat 301 are fixedly connected by bolts and nuts, and the right end of the right piston assembly 3 is limited and fixed inside the right connecting seat 301 by bolts and nuts. The right end of the rack plate 402 is fixedly connected to the right connecting seat 301 by bolts and nuts, and the rack plate 402 is limited and fixed inside the right connecting seat 301. The inside of the right piston assembly 3 is provided with a groove 302, which facilitates oil to enter the middle of the cylinder 1 through the oil inlet pipe 103. In this embodiment, the right connecting seat 301 is slidably placed on the outer wall of the right end of the right piston assembly 3, and bolts are used to pass through the right piston assembly 3 and the right connecting seat 301, and the assembly is fixed by nuts. The right end of the rack plate 402 is slidably placed inside the right connecting seat 301 and fixedly connected by bolts and nuts. This facilitates subsequent disassembly and allows the right piston assembly 3 to slide in the same direction as the left piston assembly 1.

[0031] Reference Figure 2 and 5The cylinder body 1 is equipped with three sets of pressure relief components 5. The positions of the three sets of pressure relief components 5 are symmetrical with oil pipe 103 and two oil pipes 104 respectively. The pressure relief components 5 include an oil drain pipe 501, which is fixedly connected to the inside of the cylinder body 1. A knob sleeve 502 is threadedly connected to the outer wall of the oil drain pipe 501. The knob sleeve 502 can be moved down a certain distance by rotating. A valve core 503 is slidably connected inside the oil drain pipe 501. A slide rod 504 is fixedly connected to the lower end of the valve core 503. The lower end of the slide rod 504 is in contact with the inner wall of the knob sleeve 502. A spring 505 is sleeved on the outer wall of the slide rod 504. One end of the spring 505 is fixedly connected to the inside of the valve core 503, and the other end of the spring 505 is in contact with the inner wall of the knob sleeve 502. An oil drain pipe 506 is fixedly connected inside the oil drain pipe 501. The three sets of pressure relief components 5 enable automatic pressure relief when the internal pressure of the cylinder 1 is too high. Specifically, as the knob sleeve 502 moves down a certain distance by rotating, when the internal pressure of the cylinder 1 is too high, hydraulic oil can enter the interior of the drain pipe 501 through the cylinder 1 and push the valve core 503 and slide rod 504 to slide, causing the hydraulic oil to be discharged through the drain pipe 506. After the pressure decreases, the spring 505 drives the valve core 503 and slide rod 504 to reset, causing the position of the valve core 503 to be higher than the position of the drain pipe 506, thereby achieving automatic pressure relief. This can prevent hydraulic failures and facilitate later maintenance.

[0032] Working principle: During use, oil pipe 103 and two oil pipes 104 are connected to the oil pumping system. The oil pumping system pumps oil into the middle of the cylinder 1 through oil pipe 103. The hydraulic oil enters the middle of the cylinder 1 through groove 202 and groove 302. At the same time as the oil enters, it generates a thrust on the left piston assembly 2 and the right piston assembly 3, pushing them to both sides. The oil on both sides of the left piston assembly 2 and the right piston assembly 3 is discharged through the two oil pipes 104. Since the operating principle of the hydraulic oil in the cylinder 1 and the structural layout of each oil pipe are existing technologies and are not within the scope of protection of this utility model, they are not described in detail in the accompanying drawings and text.

[0033] During the movement of the left piston assembly 2 and the right piston assembly 3, the left connecting seat 201 and the right connecting seat 301 are moved to the left and right sides respectively. When the left connecting seat 201 moves to the left, it drives the rack plate 404 to move to the left simultaneously. During the movement, the rack plate 404 drives the gear 401 to rotate, which in turn drives the rack plate 402 to move to the right. The movement of the rack plate 402 to the right drives the right connecting seat 301 and the right piston assembly 3 to move to the right. Since the rack plate 402 and the rack plate 404 are symmetrically arranged on both sides of the outer wall of the gear 401, the rack plate 404, the gear 401, and the rack plate 402 achieve the synchronous bidirectional movement of the left connecting seat 201 and the left piston assembly 2 with the right connecting seat 301 and the right piston assembly 3. This ensures that the left piston assembly 2 and the right piston assembly 3 achieve a symmetrical balance during the bidirectional movement, thereby enabling the left piston assembly 2 and the right piston assembly 3 to move synchronously in both directions and move the components.

[0034] When the left piston assembly 2 and the right piston assembly 3 need to move in the same direction, the oil pumping system pumps oil into one side of the cylinder body 1 through the left oil pipe 2 104. At the same time, the right connecting seat 301 is separated from the rack plate 1 402. The left oil inlet pipe 2 104 is used to add oil to the left side of the cylinder body 1 and push the left piston assembly 2 to move to the right. During the movement of the left piston assembly 2 to the right, the oil in the middle of the cylinder body 1 is discharged through the oil outlet pipe 103, and the oil on the right side of the cylinder body 1 is discharged through the right oil pipe 2 104. During the movement of the left piston assembly 2 to the right, it also pushes the right piston assembly 3 to move to the right, so as to achieve the effect of the left piston assembly 2 and the right piston assembly 3 moving to the right at the same time.

[0035] Alternatively, the oil pumping system pumps oil into the cylinder 1 through the right oil pipe 2 104, while simultaneously separating the left connecting seat 201 from the rack plate 2 404. The right oil pipe 2 104 is used to add oil to the right side of the cylinder 1 and push the right piston assembly 3 to slide to the left. The oil in the middle of the cylinder 1 is discharged through the oil pipe 1 103, and the oil on the left side of the cylinder 1 is discharged through the left oil pipe 2 104. The sliding of the right piston assembly 3 to the left also pushes the left piston assembly 2 to slide to the left, achieving the effect of the left piston assembly 2 and the right piston assembly 3 sliding to the left synchronously.

[0036] When it is necessary to disassemble and clean the left piston assembly 2, the right piston assembly 3, and the cylinder 1, the oil inside the cylinder 1 should be completely drained through the oil pump system. Then, first, remove the bolts between the left end cover 101 and the cylinder 1, and then remove the bolts between the right end cover 102 and the cylinder 1. Slide the left end cover 101 and the right end cover 102 to the sides respectively, causing them to disengage from the left insert block 105 and the right insert block 106 respectively. Then, remove the sealing ring 107 and the sealing ring 2 108 for cleaning or replacement. Finally, clean the connection between the left piston assembly 2 and the left connecting seat 201. The bolts and nuts are removed. The bolts and nuts between the left connecting seat 201 and the rack plate 404 are removed. The bolts and nuts between the right piston assembly 3 and the right connecting seat 301 are removed. The bolts and nuts between the right connecting seat 301 and the rack plate 402 are removed. Then the left piston assembly 2 can be separated from the cylinder body 1 and the left end cover 101, and the right piston assembly 3 can be separated from the cylinder body 1 and the right end cover 102. This allows for cleaning, inspection, and replacement of the entire hydraulic cylinder interior, facilitating disassembly and cleaning. Regular maintenance of the hydraulic cylinder interior can be performed, thus extending its service life.

[0037] Before using the hydraulic cylinder, rotate the entire device 90 degrees and install it, ensuring that the drain pipe 506 is vertically downward. Connect the drain pipe 506 to the oil tank through a pipe. Rotate the knob sleeve 502 to move it down a certain distance. During use, if the internal pressure of the cylinder 1 is too high, hydraulic oil enters the drain pipe 501 and pushes the valve core 503 and slide rod 504 to move, causing the valve core 503 to move away from the drain pipe 506 and the oil to be discharged through the drain pipe 506, thus achieving oil discharge and pressure relief. After the pressure inside the cylinder decreases, the hydraulic oil no longer pushes the valve core 503. At this time, the spring 505 drives the valve core 503 and slide rod 504 to reset and causes the valve core 503 to move above the drain pipe 506, preventing the hydraulic oil from being discharged through the drain pipe 506, thereby achieving automatic oil discharge and pressure relief.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic cylinder with a dual-piston rod balanced drive structure, comprising a cylinder body (1), characterized in that: The cylinder body (1) is equipped with a left end cap (101) and a right end cap (102) at both ends. An oil pipe (103) and two oil pipes (104) are fixedly connected inside the cylinder body (1). The oil pipe (103) is located in the middle of the inside of the cylinder body (1), and the two oil pipes (104) are located on both sides of the inside of the cylinder body (1). A left piston assembly (2) and a right piston assembly (3) are symmetrically slidably connected inside the cylinder body (1). A left connecting seat (201) is installed on the left side of the outer wall of the left piston assembly (2), and a right connecting seat (301) is installed on the right side of the outer wall of the right piston assembly (3). Connecting brackets (4) are fixedly connected to both sides of the outer wall of the cylinder body (1). A gear (401) is rotatably connected inside the connecting bracket (4). The connecting frame (4) is internally connected to a slider 1 (403), and a rack plate 1 (402) is fixedly connected to the lower surface of the slider 1 (403). The rack plate 1 (402) meshes with the gear (401). The right end of the rack plate 1 (402) is installed inside the right connecting seat (301). The connecting frame (4) is internally connected to a slider 2 (405), and a rack plate 2 (404) is fixedly connected to the upper surface of the slider 2 (405). The rack plate 2 (404) meshes with the gear (401). The left end of the rack plate 2 (404) is installed inside the left connecting seat (201). The rack plate 1 (402) and the rack plate 2 (404) are symmetrically arranged on both sides of the outer wall of the gear (401).

2. The hydraulic cylinder with a dual-piston rod balanced drive structure according to claim 1, characterized in that: The left piston assembly (2) consists of a rod and a piston plate, and the right piston assembly (3) consists of a rod and a piston plate.

3. The hydraulic cylinder with a dual-piston rod balanced drive structure according to claim 2, characterized in that: A left insert block (105) is fixedly connected to the left side of the outer wall of the cylinder (1). The left insert block (105) is slidably connected to the inside of the left end cover (101). The rod part of the left piston assembly (2) is slidably connected to the inside of the left end cover (101). The left insert block (105) is threadedly connected to the inside of the left end cover (101) with a bolt. A sealing ring (107) is placed between the left end cover (101) and the cylinder (1).

4. The hydraulic cylinder with a dual-piston rod balanced drive structure according to claim 3, characterized in that: A right insert block (106) is fixedly connected to the right side of the outer wall of the cylinder (1). The right insert block (106) is slidably connected to the inside of the right end cover (102). The rod part of the right piston assembly (3) is slidably connected to the inside of the right end cover (102). The right insert block (106) is threadedly connected to the inside of the right end cover (102) with a bolt. A sealing ring (108) is placed between the right end cover (102) and the cylinder (1).

5. A hydraulic cylinder with a dual-piston rod balanced drive structure according to claim 1, characterized in that: The left end of the left piston assembly (2) is slidably connected to the inside of the left connecting seat (201). The left piston assembly (2) and the left connecting seat (201) are fixedly connected by bolts and nuts. The left end of the rack plate (404) is fixedly connected to the left connecting seat (201) by bolts and nuts. The left piston assembly (2) has a groove (202) inside.

6. A hydraulic cylinder with a dual-piston rod balanced drive structure according to claim 5, characterized in that: The right end of the right piston assembly (3) is slidably connected to the inside of the right connecting seat (301). The right piston assembly (3) and the right connecting seat (301) are fixedly connected by bolts and nuts. The right end of the rack plate (402) is fixedly connected to the right connecting seat (301) by bolts and nuts. The inside of the right piston assembly (3) is provided with a groove (302).

7. A hydraulic cylinder with a dual-piston rod balanced drive structure according to claim 1, characterized in that: The cylinder body (1) is equipped with three pressure relief components (5). The pressure relief components (5) include an oil drain pipe (501). The oil drain pipe (501) is fixedly connected to the inside of the cylinder body (1). A knob sleeve (502) is threadedly connected to the outer wall of the oil drain pipe (501). A valve core (503) is slidably connected inside the oil drain pipe (501).

8. A hydraulic cylinder with a dual-piston rod balanced drive structure according to claim 7, characterized in that: The lower end of the valve core (503) is fixedly connected to a slide rod (504). The lower end of the slide rod (504) is in contact with the inner wall of the knob sleeve (502). A spring (505) is sleeved on the outer wall of the slide rod (504). One end of the spring (505) is fixedly connected to the inside of the valve core (503), and the other end of the spring (505) is in contact with the inner wall of the knob sleeve (502). An oil drain pipe (506) is fixedly connected to the inside of the oil drain pipe (501).

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