Pipe explosion-proof cylinder bottom structure of lifting oil cylinder
By designing the bottom structure of the explosion-proof pipe of the lifting cylinder, the combination of the rod-free cavity oil port and the oil-through hole is used to achieve slow pressure relief of the oil pressure, solving the problem of cumbersome installation and maintenance of the explosion-proof pipe in the prior art, and reducing system costs and maintenance costs.
Patent Information
- Application Number
- CN202422326079.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-09-24
AI Technical Summary
The existing lifting cylinders have problems such as cumbersome installation and maintenance and high cost in terms of explosion-proof pipes, resulting in increased system costs and maintenance costs.
A cylinder bottom structure of the lifting oil cylinder explosion-proof pipe is designed, including the cylinder bottom and the oil pipe joint. The side wall of the cylinder bottom is equipped with a rod-free oil port, and is connected to the oil pipe joint through the first and second oil-passing holes. The valve core limit part and the spring are combined to achieve slow pressure relief of the oil pressure.
The explosion-proof pipe function of the lifting cylinder is realized, while simplifying the installation and maintenance of parts, reducing costs and maintenance complexity.
Smart Images
Figure CN223019091U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an explosion-proof pipe cylinder bottom structure of a lifting oil cylinder, belonging to the technical field of hydraulic oil cylinders. Background Art
[0002] At present, in order to prevent the system risks caused by pipe explosion during the use of lifting cylinders, oil pipe explosion-proof valves are generally used to ensure the safety of lifting cylinders caused by sudden pipe explosions. However, the installation and maintenance of explosion-proof valves during use are cumbersome and expensive, which greatly increases the cost and maintenance costs of lifting cylinders. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a lifting oil cylinder explosion-proof pipe cylinder bottom structure which has a simple structure and is convenient to install and maintain.
[0004] The technical solution adopted by the utility model to solve its technical problems is: a lifting cylinder explosion-proof pipe cylinder bottom structure, including a cylinder bottom and an oil pipe joint, the side wall of the cylinder bottom is provided with a rodless chamber oil port, the cylinder bottom is provided with an oil hole for connecting the rodless chamber oil port and the rodless chamber of the cylinder, the oil pipe joint is connected to the outer end position of the rodless chamber oil port and combined to form an oil passage at the outer end of the oil port, the oil hole includes a first oil hole connected to the axial middle position of the rodless chamber oil port and a second oil hole connected to the inner end position of the rodless chamber oil port, the oil pipe joint has a valve core limiting part located in the rodless chamber oil port, a spring and a valve core are installed in the rodless chamber oil port, the valve core can reciprocate along the axial direction of the rodless chamber oil port, and the axial direction of the spring is aligned with the rodless chamber The oil port of the cavity is axially consistent, one end of the spring is connected to the valve core, and the other end is connected to the valve core limiting part. When the spring is in the natural state, the valve core is in the first state where the port inside the oil passage at the outer end of the oil port is not covered. At this time, the first oil hole is directly connected to the inner port of the oil passage at the outer end of the oil port to form a first oil passage. When the valve core compression spring moves toward the direction close to the valve core limiting part, the valve core can be in the second state of covering the port inside the oil passage at the outer end of the oil port. At this time, the first oil hole is connected to the port inside the oil passage at the outer end of the oil port through a flow limiting passage set on the valve core to form a second oil passage. The oil flow rate of the second oil passage is less than the oil flow rate of the first oil passage.
[0005] It is further preferred that the valve core limiting portion has a spring installation groove adapted to the spring.
[0006] It is further preferred that the flow limiting passage includes a central blind hole arranged on the outer end surface of the valve core facing the valve core limiting portion and a flow limiting ring groove arranged on the outer peripheral surface of the valve core, and the central blind hole and the flow limiting ring groove are connected through one or more radial flow limiting holes.
[0007] Further preferably, the spring is coaxially arranged within the central blind hole, and a spring positioning step surface for abutting against the end of the spring is provided on the inner wall of the central blind hole; a valve core positioning step surface is provided on the side wall of the rodless cavity oil port. When the valve core is in the first state, the end of the valve core away from the valve core limiting portion is in contact with the valve core positioning step surface.
[0008] Further preferably, when the valve core is in the second state, the flow-limiting annular groove is in a position aligned with the first oil passage hole.
[0009] Further preferably, the connection port of the first oil passage hole and the rodless cavity oil port is set as orifice A, and the connection port of the second oil passage hole and the rodless cavity oil port is set as orifice B. When the valve core is in the first state, the valve core is completely located within the interval area between the outer edge of orifice A close to orifice B and the outer edge of orifice B close to orifice A.
[0010] Further preferably, the axis of the rodless cavity oil port is arranged along the radial direction of the cylinder bottom, and the axes of the first oil passage hole and the second oil passage hole are both arranged along the axial direction of the cylinder bottom.
[0011] Further preferably, the oil pipe joint is connected to the rodless cavity oil port through a threaded connection structure, and a sealing ring is provided on the mating surface of the oil pipe joint and the rodless cavity oil port; the threaded connection structure includes a threaded column provided on the oil pipe joint and a threaded hole provided on the rodless cavity oil port, and the valve core limiting portion is coaxially arranged at the end of the threaded column close to the inner cavity of the rodless cavity oil port.
[0012] The working principle of the present utility model is as follows: When the oil cylinder is working normally, oil normally enters the rodless cavity of the oil cylinder from the oil pipe joint through the first oil passage, and the oil cylinder is lifted by the action of the piston. When a burst pipe occurs instantaneously, the instantaneous pressure relief at the outer end of the oil pipe joint is basically zero. Due to the combined action of the gravity of the piston and the piston rod, and the gravity generated by the lifted object, the piston moves downward to generate a reflux oil pressure. At this time, pressure relief occurs simultaneously through the circuits where the first oil passage hole and the second oil passage hole are located. Although the first oil passage hole and the second oil passage hole are both located at the cylinder bottom at this time and the burst pipe pressures are the same, since the first oil passage hole is directly connected to the oil passage at the outer end of the oil port, the circuit where the first oil passage hole is located will be instantaneously connected to the oil pipe joint when the valve core does not move, and the oil pressure will be quickly relieved to zero or slightly greater than zero; due to the blockage of the valve core, the circuit where the second oil passage hole is located cannot be instantaneously relieved of pressure, and a force will be generated to push the valve core towards the oil pipe joint direction, thereby causing the valve core to block the oil passage at the outer end of the oil port, and slow pressure relief is achieved through the second oil passage. During the pressure relief process, since the first oil passage hole and the second oil passage hole are in a communicating circuit, the oil pressures of the first oil passage hole and the second oil passage hole gradually reach a stable and identical state at this time. The present utility model mainly plays an explosion-proof role of instantaneously protecting the oil cylinder and the lifted object, and realizes the function of safe pressure relief and explosion prevention.
[0013] The beneficial effects of the present utility model are as follows: The explosion-proof pipe function of the lifting oil cylinder can be realized. Meanwhile, the installation and maintenance of components are simple, the number of components is small, and the structure is also simple and practical. Description of the Drawings
[0014] Figure 1 It is a schematic diagram of the overall structure of the present utility model.
[0015] Figure 2 It is a schematic diagram of the bottom structure of the cylinder of the present utility model.
[0016] Figure 3 It is a schematic cross-sectional view of the valve core.
[0017] Figure 4 It is a schematic diagram of the oil inlet route when the oil cylinder is working normally.
[0018] Figure 5 It is a schematic diagram of the valve core lifting and flow-limiting pressure-relieving routes after the pipe bursts.
[0019] The markings in the figure are: oil pipe joint 1, cylinder bottom 2, valve core limiting part 3, spring 4, valve core 5, first oil passage 6, second oil passage 7, valve core lifting oil circuit 8, rodless cavity oil port 201, first oil hole 202, second oil hole 203, valve core positioning step surface 204, flow-limiting ring groove 501, radial flow-limiting hole 502. Specific Embodiments
[0020] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0021] As Figures 1 to 5As shown, the utility model includes a cylinder bottom 2 and an oil pipe joint 1, the side wall of the cylinder bottom 2 is provided with a rodless chamber oil port 201, the cylinder bottom 2 is provided with an oil hole for connecting the rodless chamber oil port 201 and the rodless chamber of the cylinder, the oil pipe joint 1 is connected to the outer end position of the rodless chamber oil port 201 and is combined to form an oil passage at the outer end of the oil port, the oil hole includes a first oil hole 202 connected to the axial middle position of the rodless chamber oil port 201 and a second oil hole 203 connected to the inner end position of the rodless chamber oil port 201, the oil pipe joint 1 has a valve core limiting portion 3 located in the rodless chamber oil port 201, a spring 4 and a valve core 5 are installed in the rodless chamber oil port 201, the valve core 5 can reciprocate along the axial direction of the rodless chamber oil port 201, the axial direction of the spring 4 is aligned with the rodless chamber oil port 2 01 axially consistent, one end of the spring 4 is connected to the valve core 5, and the other end is connected to the valve core limit part 3. When the spring 4 is in the natural state, the valve core 5 is in the first state where the port inside the oil passage at the outer end of the oil port is not covered. At this time, the first oil hole 202 is directly connected to the inner port of the oil passage at the outer end of the oil port to form a first oil passage 6. When the valve core 5 compresses the spring 4 and moves toward the direction close to the valve core limit part 3, the valve core 5 can be in the second state of covering the port inside the oil passage at the outer end of the oil port. At this time, the first oil hole 202 is connected to the inner port of the oil passage at the outer end of the oil port through the flow limiting passage set on the valve core 5 to form a second oil passage 7. The oil flow rate of the second oil passage 7 is less than the oil flow rate of the first oil passage 6. Specifically, when the valve core 5 is in the second state of covering the port in the oil passage at the outer end of the oil port, the covering here should be understood in a broad sense, and a complete sealing effect is not mandatory, as long as the oil flow rate of the second oil passage 7 can be ensured to be less than the oil flow rate of the first oil passage 6, and the second oil passage 7 can achieve a slow pressure relief effect. Specifically, "the valve core 5 covers the port in the oil passage at the outer end of the oil port" can refer to blocking the rodless cavity oil port 201, or it can refer to blocking the oil pipe joint 1. For example, in the embodiment shown in the figure, the blocking object of the valve core 5 is the oil passage where the valve core limiter 3 is located.
[0022] The working principle of the utility model is as follows: When the oil cylinder works normally, oil enters the rodless cavity of the oil cylinder through the first oil passage 6 from the oil pipe joint 1 and pushes the oil cylinder to lift through the action of the piston. When a pipe burst occurs instantaneously, the instantaneous pressure relief at the outer end of the oil pipe joint 1 basically becomes 0. Due to the combined action of the gravity of the piston and the piston rod and the gravity generated by the lifted object, the piston moves downward to generate a reflux oil pressure. At this time, pressure relief occurs simultaneously through the circuits where the first oil hole 202 and the second oil hole 203 are located. Although the first oil hole 202 and the second oil hole 203 are both located on the bottom 2 of the cylinder at this time and the pipe burst pressure is the same, since the first oil hole 202 is directly connected to the oil passage at the outer end of the oil port, the circuit where the first oil hole 202 is located will be instantaneously connected to the oil pipe joint 1 when the valve core does not move, and the oil pressure will quickly relieve to 0 or slightly greater than 0; the circuit where the second oil hole 202 is located (i.e., the valve core jacking oil passage 8 shown in the figure) cannot relieve pressure instantaneously due to the blockage of the valve core 5, and a force will be generated to push the valve core 5 in the direction of the oil pipe joint 1, thereby causing the valve core 5 to block the oil passage at the outer end of the oil port, and slow pressure relief is achieved through the second oil passage 7.
[0023] For the convenience of assembly, the valve core limiting part 3 has a spring installation groove adapted to the spring 4. The valve core limiting part 3 can be designed as an integral structure with the oil pipe joint 1 or a split structure.
[0024] For the convenience of processing and assembly, the flow-limiting passage includes a central blind hole provided on the outer end face of the valve core 5 facing the valve core limiting part 3 and a flow-limiting ring groove 501 provided on the outer peripheral surface of the valve core 5. The central blind hole and the flow-limiting ring groove 501 are connected through one or more radial flow-limiting holes 502. The size and number of the radial flow-limiting holes 502 can be set according to the flow-limiting requirements. The cross-sectional form of the flow-limiting ring groove 501 can be rectangular, R-shaped, V-shaped, etc.
[0025] For the convenience of processing and assembly, the spring 4 is coaxially arranged in the central blind hole, and a spring positioning step surface for abutting against the end of the spring 4 is provided on the inner wall of the central blind hole; a valve core positioning step surface 204 is provided on the side wall of the rodless cavity oil port 201. When the valve core 5 is in the first state, the end of the valve core 5 far from the valve core limiting part 3 contacts the valve core positioning step surface 204. It can be understood that in some alternative embodiments, multiple springs 4 can also be arranged in parallel. In some alternative embodiments, both ends of the spring 4 can also be fixedly connected to the valve core 5 and the valve core limiting part 3 at the same time, and the valve core positioning step surface 204 may not be provided at this time.
[0026] For the convenience of controlling the flow-limiting effect, when the valve core 5 is in the second state, the flow-limiting ring groove 501 is in a position aligned with the first oil hole 202. Figure 1The orientation shown means that the upper edge position of the notch of the current-limiting ring groove 501 is lower than the upper edge position of the orifice of the first oil passage hole 202, and the lower edge position of the notch of the current-limiting ring groove 501 is higher than the lower edge position of the orifice of the first oil passage hole 202.
[0027] To effectively ensure the oil inlet flow rate during the normal operation of the oil cylinder, the preferred arrangement of the valve core 5 is as follows. The connection port between the first oil passage hole 202 and the rodless cavity oil port 201 is set as orifice A, and the connection port between the second oil passage hole 203 and the rodless cavity oil port 201 is set as orifice B. When the valve core 5 is in the first state, the valve core 5 is completely located within the interval area between the outer edge of orifice A close to orifice B and the outer edge of orifice B close to orifice A.
[0028] For the convenience of machining and assembly, the axis of the rodless cavity oil port 201 is arranged along the radial direction of the cylinder bottom 2, and the axes of the first oil passage hole 202 and the second oil passage hole 203 are both arranged along the axial direction of the cylinder bottom 2.
[0029] For the convenience of machining and assembly, the oil pipe joint 1 is connected to the rodless cavity oil port 201 through a threaded connection structure, and a sealing ring is provided on the mating surface of the oil pipe joint 1 and the rodless cavity oil port 201; the threaded connection structure includes a threaded post provided on the oil pipe joint 1 and a threaded hole provided on the rodless cavity oil port 201, and the valve core limiting part 3 is coaxially arranged at the end of the threaded post close to the inner cavity of the rodless cavity oil port 201.
Claims
1. A cylinder bottom structure of an explosion-proof pipe of a lifting cylinder, comprising a cylinder bottom (2) and an oil pipe joint (1), wherein a rodless chamber oil port (201) is arranged on a side wall of the cylinder bottom (2), and an oil hole for connecting the rodless chamber oil port (201) and the cylinder rodless chamber is arranged on the cylinder bottom (2), and the oil pipe joint (1) is connected to the outer end position of the rodless chamber oil port (201) and is combined to form an oil passage at the outer end of the oil port, characterized in that: The oil through hole comprises a first oil through hole (202) connected to the axial middle position of the rodless chamber oil port (201) and a second oil through hole (203) connected to the inner end position of the rodless chamber oil port (201). The oil pipe joint (1) has a valve core limiting portion (3) located in the rodless chamber oil port (201). A spring (4) and a valve core (5) are installed in the rodless chamber oil port (201). The valve core (5) can reciprocate along the axial direction of the rodless chamber oil port (201). The axial direction of the spring (4) is consistent with the axial direction of the rodless chamber oil port (201). One end of the spring (4) is connected to the valve core (5) and the other end is connected to the valve core limiting portion (3). When the spring (4) is in a natural state, When the valve core (5) is in the first state in which the inner port of the oil passage at the outer end of the oil port is not covered, the first oil hole (202) is directly connected to the inner port of the oil passage at the outer end of the oil port to form a first oil passage (6), and when the valve core (5) compresses the spring (4) and moves in a direction close to the valve core limit portion (3), the valve core (5) can be in the second state in which the inner port of the oil passage at the outer end of the oil port is covered, the first oil hole (202) is connected to the inner port of the oil passage at the outer end of the oil port through a flow limiting passage provided on the valve core (5) to form a second oil passage (7), and the oil flow rate of the second oil passage (7) is less than the oil flow rate of the first oil passage (6).
2. The explosion-proof pipe bottom structure of the lifting cylinder according to claim 1, characterized in that: The valve core limiting portion (3) has a spring installation groove adapted to the spring (4).
3. The explosion-proof pipe bottom structure of the lifting cylinder according to claim 1, characterized in that: The flow limiting passage comprises a central blind hole arranged on the outer end surface of the valve core (5) on the side facing the valve core limiting portion (3) and a flow limiting annular groove (501) arranged on the outer peripheral surface of the valve core (5); the central blind hole and the flow limiting annular groove (501) are connected via one or more radial flow limiting holes (502).
4. The explosion-proof pipe bottom structure of the lifting cylinder according to claim 3, characterized in that: The spring (4) is coaxially arranged in the central blind hole, and the inner wall of the central blind hole is provided with a spring positioning step surface for abutting against the end of the spring (4); the side wall of the rodless chamber oil port (201) is provided with a valve core positioning step surface (204), and when the valve core (5) is in the first state, one end of the valve core (5) away from the valve core limiting portion (3) contacts the valve core positioning step surface (204).
5. The explosion-proof pipe bottom structure of the lifting cylinder according to claim 3, characterized in that: When the valve core (5) is in the second state, the flow limiting annular groove (501) is in a position aligned with the first oil passage hole (202).
6. The explosion-proof pipe bottom structure of the lifting cylinder according to claim 1, characterized in that: The connection port between the first oil hole (202) and the rodless chamber oil port (201) is set as port A, and the connection port between the second oil hole (203) and the rodless chamber oil port (201) is set as port B. When the valve core (5) is in the first state, the valve core (5) is completely located in the interval area between the outer edge of port A on the side close to port B and the outer edge of port B on the side close to port A.
7. The explosion-proof pipe bottom structure of the lifting cylinder according to claim 1, characterized in that: The axis of the rodless chamber oil port (201) is arranged along the radial direction of the cylinder bottom (2), and the axis of the first oil hole (202) and the axis of the second oil hole (203) are both arranged along the axial direction of the cylinder bottom (2).
8. The explosion-proof pipe bottom structure of a lifting cylinder according to any one of claims 1 to 7, characterized in that: The oil pipe joint (1) is connected to the rodless chamber oil port (201) via a threaded connection structure, and a sealing ring is provided on the mating surfaces of the oil pipe joint (1) and the rodless chamber oil port (201); the threaded connection structure comprises a threaded column provided on the oil pipe joint (1) and a threaded hole provided on the rodless chamber oil port (201), and a valve core limiting portion (3) is coaxially provided at the end of the threaded column close to the inner cavity of the rodless chamber oil port (201).