Explosion-proof hydraulic oil cylinder

Abstract

The utility model belongs to the technical field of hydraulic oil cylinders, and particularly relates to an anti-explosion hydraulic oil cylinder which comprises a cylinder body. A cylinder seat and a piston are arranged in the cylinder body; an oil inlet / outlet is formed in the cylinder body; a main oil way and an auxiliary oil way are arranged in the cylinder base. A buffer seat is further arranged on the outer side of the oil inlet / outlet; the buffer seat is connected with the auxiliary oil way through a branch; and an opening and closing mechanism is arranged in the branch. According to the design, peak pressure and temperature generated by hydraulic oil in the cylinder body can be effectively relieved. In other words, when the piston works aiming at an object with the limit weight and moves to the maximum stroke, the hydraulic oil is in the state with the highest oil pressure and the highest oil temperature, the high oil pressure can push the opening and closing mechanism to be opened during oil outlet, and part of the hydraulic oil enters the buffer seat through the branch; the other part of hydraulic oil normally returns to the oil inlet / outlet through the main oil path; and hydraulic oil entering the buffer seat cannot immediately return to the oil inlet / outlet, so that the oil outlet pressure and temperature are greatly relieved.

Description

Technical Field

[0001] This utility model relates to a hydraulic cylinder, specifically an explosion-proof hydraulic cylinder, and belongs to the field of hydraulic cylinder technology. Background Technology

[0002] In a hydraulic cylinder, hydraulic oil circulates between the cylinder body and the hydraulic pump, thereby driving the piston rod. During the oil inlet process, the hydraulic oil is subjected to significant pressure within the cylinder, especially when lifting a large target weight and the piston needs to extend or retract to its maximum stroke, causing a rapid increase in temperature. Therefore, during the oil outlet process, the high temperature and high pressure of the hydraulic oil can easily cause the inlet / outlet ports and joint connections to burst, resulting in hydraulic oil leakage. To solve this problem, Chinese patent document CN220319998U discloses an explosion-proof hydraulic cylinder, which uses a channel made inside the nut of the external oil pipe and introduces gas into the channel to provide a buffering effect. This method requires creating a channel inside the nut, resulting in extremely high manufacturing precision and high production costs. Furthermore, the strength of the external pipe joint is far lower than that of the nut; merely providing a buffering measure for the nut means that even if the nut can withstand the high temperature and pressure of the hydraulic oil, the external pipe joint may still burst.

[0003] Therefore, further improvements are needed. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose an explosion-proof hydraulic cylinder that reduces oil pressure and temperature, reduces the load on external pipelines, has a simple and reasonable structure, and reduces the risk of pipeline rupture.

[0005] An explosion-proof hydraulic cylinder includes a cylinder body; a cylinder seat and a piston are disposed within the cylinder body; an oil inlet and an oil outlet are disposed on the cylinder body; a guide block is disposed on the edge of the end face of the cylinder seat; a main oil passage is disposed within the cylinder seat; a secondary oil passage is also disposed on the cylinder seat; an opening and closing mechanism is disposed within the secondary oil passage; a buffer seat is disposed outside the oil outlet; the buffer seat is connected to the secondary oil passage via a branch.

[0006] Furthermore, the opening and closing mechanism includes a plunger disposed in the secondary oil passage; the plunger has first protrusions on both sides; the inner wall of the secondary oil passage has a first guide groove; the first protrusions are slidably disposed in the first guide groove and are connected to the first spring.

[0007] Furthermore, the bottom cross-section of the plunger is inverted trapezoidal; the end of the auxiliary oil passage near the main oil passage is trapezoidal; the bottom of the plunger is in close contact with or separate from the trapezoidal end of the auxiliary oil passage.

[0008] Furthermore, the branch has openings at both ends relative to the auxiliary oil circuit and the buffer seat, and is connected to the auxiliary oil circuit and the buffer seat through the openings.

[0009] Furthermore, the buffer seat surrounds the outside of the oil outlet; an inclined base is provided inside the buffer seat; the oil inlet / outlet passes through the inclined base from bottom to top and opens onto the surface of the inclined base.

[0010] Furthermore, the upper part of the inclined base is a buffer cavity; the side of the oil outlet is provided with a strip hole; the oil outlet is connected to the buffer cavity through the strip hole.

[0011] Furthermore, the perforation is arranged around the oil outlet.

[0012] This invention offers the following advantages: This design effectively alleviates the peak pressure and temperature generated by the hydraulic oil within the cylinder. Specifically, when the piston operates on an object of extreme weight and reaches its maximum stroke, the hydraulic oil is at its highest pressure and temperature. Upon discharge, the high oil pressure pushes the opening and closing mechanism open, allowing some hydraulic oil to enter the buffer seat through a branch line; the remaining hydraulic oil returns normally to the inlet / outlet port through the main oil circuit. The hydraulic oil entering the buffer seat does not immediately return to the inlet / outlet port, significantly reducing discharge pressure and temperature. The hydraulic oil in the buffer seat slowly enters the outlet port under gravity, releasing heat and pressure in the process. This invention ensures that the cylinder can operate normally under extreme conditions, and the hose connected to the outlet port will not burst. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a structural diagram of the opening and closing mechanism, auxiliary oil circuit, and branch circuit.

[0015] Figure 3 This is a schematic diagram of the buffer seat.

[0016] In the diagram: 1 is the cylinder block, 2 is the cylinder seat, 3 is the piston, 5 is the oil inlet / outlet, 5-1 is the strip hole, 7 is the auxiliary oil passage, 8 is the buffer seat, 8-1 is the inclined base, 8-2 is the buffer cavity, 9 is the branch passage, 10 is the plunger, 11 is the first protrusion, 12 is the first guide groove, and 13 is the main oil passage. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] See Figures 1-3This application discloses an explosion-proof hydraulic cylinder, including a cylinder body 1; a cylinder seat 2 and a piston 3 are provided inside the cylinder body 1; an oil inlet / outlet port 5 is provided on the cylinder body 1; a main oil passage 13 and a secondary oil passage 7 are provided inside the cylinder seat 2; an opening and closing mechanism is provided inside the branch passage 9; a buffer seat 8 is also provided outside the oil outlet 5; the buffer seat 8 is connected to the secondary oil passage 7 through the branch passage 9.

[0019] Furthermore, the opening and closing mechanism includes a plunger 10 disposed in the branch 9; the plunger 10 has first protrusions 11 on both sides; the inner wall of the branch 9 has a first guide groove 12; the first protrusions 11 are slidably disposed in the first guide groove 12 and are connected to the first spring.

[0020] Furthermore, the bottom cross-section of the plunger 10 is inverted trapezoidal; the end of the branch 9 near the main oil passage 13 is trapezoidal; the bottom of the plunger 10 is in close contact with or separate from the trapezoidal end of the branch 9.

[0021] Furthermore, the buffer seat 8 surrounds the outside of the oil outlet 5; the buffer seat 8 is provided with an inclined base 8-1; the oil inlet / outlet 5 passes through the inclined base 8-1 from bottom to top and opens on the surface of the inclined base 8-1.

[0022] Furthermore, the upper part of the inclined base 8-1 is a buffer cavity 8-2; the side of the oil outlet 5 is provided with a strip hole 5-1; the oil outlet 5 is connected to the buffer cavity 8-2 through the strip hole 5-1.

[0023] Furthermore, the groove 5-1 is arranged around the oil outlet 5.

[0024] Working Principle: When the piston acts on an object of extreme weight and moves to its maximum stroke, the hydraulic oil pressure and temperature are at their maximum. This overcomes the force of the first spring, pushing the plunger 10 upwards, causing the two trapezoidal surfaces to separate. Part of the hydraulic oil can then enter branch 9 from the auxiliary oil passage 7, and from branch 9 into the surface of the inclined base 8-1 of the buffer seat 8. The remaining hydraulic oil will directly enter the inlet / outlet port 5. Because some hydraulic oil is inside the buffer seat 8 and does not immediately enter the inlet / outlet port 5, the required oil pressure within the inlet / outlet port 5 is significantly reduced. Furthermore, the hydraulic oil in the buffer seat 8 flows slowly along the inclined base 8-1 into the inlet / outlet port 5, effectively reducing the oil temperature. Finally, the oil is collected and discharged from the inlet / outlet port 5 and recovered by the pump body. This effectively ensures the stability of the connection between the outlet and the external pipeline under extreme conditions.

[0025] When the oil pressure inside the cylinder is insufficient under non-maximum weight conditions, the plunger 10 cannot be pushed upwards, and thus cannot enter the branch circuit and buffer seat 8; even when the maximum stroke is not reached, the connection cannot be established.

[0026] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An explosion-proof hydraulic cylinder, comprising a cylinder body (1); a cylinder seat (2) and a piston (3) are disposed inside the cylinder body (1); an oil inlet / outlet (5) is disposed on the cylinder body (1), characterized in that: The cylinder seat (2) is provided with a main oil passage (13) and a secondary oil passage (7); a buffer seat (8) is also provided on the outside of the oil inlet / outlet (5); the buffer seat (8) is connected to the secondary oil passage (7) through a branch (9); an opening and closing mechanism is provided in the branch (9).

2. The explosion-proof hydraulic cylinder according to claim 1, characterized in that: The opening and closing mechanism includes a plunger (10) disposed in the branch (9); the plunger (10) has a first protrusion (11) on both sides; the inner wall of the branch (9) has a first guide groove (12); the first protrusion (11) is slidably disposed in the first guide groove (12) and is connected to the first spring.

3. The explosion-proof hydraulic cylinder according to claim 2, characterized in that: The bottom cross section of the plunger (10) is inverted trapezoidal; the end of the branch (9) near the auxiliary oil passage (7) is trapezoidal; the bottom of the plunger (10) is in close contact with or separate from the trapezoidal end of the branch (9).

4. The explosion-proof hydraulic cylinder according to claim 3, characterized in that: The buffer seat (8) surrounds the outside of the oil inlet / outlet (5); the buffer seat (8) is provided with an inclined base (8-1); the oil inlet / outlet (5) passes through the inclined base (8-1) from bottom to top and opens on the surface of the inclined base (8-1).

5. The explosion-proof hydraulic cylinder according to claim 4, characterized in that: The upper part of the inclined base (8-1) is a buffer cavity (8-2); the side of the oil inlet / outlet (5) is provided with a strip hole (5-1); the oil inlet / outlet (5) is connected to the buffer cavity (8-2) through the strip hole (5-1).

6. The explosion-proof hydraulic cylinder according to claim 5, characterized in that: The perforations (5-1) are arranged around the oil inlet / outlet (5).

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