One-way oil passing mechanism for oil cylinder

Abstract

The one-way oil passing mechanism is arranged on a piston of the oil cylinder and comprises a copper sleeve and a valve element, the copper sleeve is connected to one end of the valve element in a sleeved mode, the valve element is provided with a containing cavity, a spring enabling the valve element to automatically reset is arranged in the containing cavity, an oil passing channel is arranged in the piston, and the copper sleeve and the valve element are embedded in the oil passing channel. According to the one-way oil passing mechanism for the oil cylinder, the piston pressing plate and the valve sleeve are simple in structure and easy to machine, in addition, the one-way oil passing mechanism for the oil cylinder is formed by directly installing the copper sleeve, the valve element and the spring into the piston, components are saved, the component machining precision is easier to control, and therefore the component machining and assembling difficulty and the machining cost are reduced. Due to the fact that the structure is simplified, occupation of the sectional area of the oil passing channel is reduced, the effective flow area of the oil passing channel is larger, and the oil passing flow and the acting output speed of the piston can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, and more specifically, to a one-way oil passing mechanism for an oil cylinder. Background Art

[0002] The oil cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs reciprocating motion. It drives the piston to move back and forth through the oil pressure difference conversion of the chambers on both sides of the internal piston, and outputs mechanical energy through the piston. In order to shorten the working cycle, some oil cylinders are provided with a one-way oil flow mechanism on the piston, so that the hydraulic oil can pass through the piston during the work output process of the piston, thereby quickly completing the oil volume change on both sides of the piston and accelerating the work output of the piston. In the prior art, the one-way oil flow mechanism is usually in the form of an integral one-way valve. The structure of the integral one-way valve is relatively complex, with many components, and the effective oil flow area is small within the same cross-sectional area. The oil flow rate is limited, which makes the piston work output speed increase limited. The invention patent with publication number CN108571554A discloses an electromagnetic adjustable damping oil cylinder. In this invention, a piston one-way valve is provided on the piston, and there is also the problem of limited oil flow and piston work output speed. Utility Model Content

[0003] Existing one-way oil flow mechanisms for oil cylinders mostly adopt the form of an integral one-way valve, which has a relatively complex structure and many components. The effective oil flow area is small within the same cross-sectional area, which affects the oil flow rate and the piston work output speed. To overcome this defect, the utility model provides a one-way oil flow mechanism for an oil cylinder, which can increase the oil flow rate and the piston work output speed.

[0004] The technical solution of the utility model is: a one-way oil-passing mechanism for an oil cylinder, which is arranged on the piston of the oil cylinder, and includes a copper sleeve and a valve core. The copper sleeve is sleeved on one end of the valve core, and the valve core has a cavity, and a spring is arranged in the cavity to automatically reset the valve core. An oil-passing channel is arranged in the piston, and the copper sleeve and the valve core are embedded in the oil-passing channel. The conventional integral one-way valve centrally assembles the copper sleeve, the valve core and the spring in a valve seat, and then the one-way valve is installed in the piston as a whole. The one-way oil-passing mechanism for the oil cylinder is formed by directly assembling the copper sleeve, the valve core and the spring into the piston. The piston replaces the valve seat of the conventional one-way valve, which not only saves parts, but also can be processed to a larger size, thereby reducing the difficulty of part processing and assembly, as well as the processing cost. Since the valve seat is streamlined, the occupation of the cross-sectional area of ​​the oil-passing channel is reduced, so that the effective flow area of ​​the oil-passing channel is larger, thereby increasing the oil flow rate and the piston work output speed.

[0005] Preferably, it also includes a piston pressure plate and a valve sleeve, the valve sleeve is built into the oil passage and close to one end face of the piston, and the piston pressure plate is installed on the end face of the piston where the valve sleeve is located. The piston pressure plate is used to block the opening of the oil passage on the piston end face, limit the valve sleeve, copper sleeve and valve core in the oil passage, and effectively prevent the components in the oil passage from falling out.

[0006] Preferably, a conical surface is provided on the outer peripheral surface of the valve core, and the inner edge of the copper sleeve port contacts the conical surface. The inner edge of the copper sleeve port abuts against the conical surface to form an annular line contact sealing structure, which is the opening and closing node when the piston passes oil. When the copper sleeve contacts the conical surface, the oil cannot pass through this point, the oil passage path is blocked, and the oil passage function of the piston is shielded; when the copper sleeve is separated from the conical surface, the oil can pass through this point, the oil passage path is connected, and the oil passage function of the piston is activated.

[0007] Preferably, the oil passage includes an axial oil passage and an oblique oil passage, the oblique oil passage connects the piston end face and the axial oil passage, the copper sleeve, the valve core, and the valve sleeve are all located in the axial oil passage. The axial oil passage is convenient for loading or removing the copper sleeve, the valve core, and the valve sleeve, and the oblique oil passage is convenient for oil inlet.

[0008] Preferably, a valve sleeve installation part is provided on the valve sleeve, the valve sleeve installation part is an inner hole type structure, and the valve sleeve installation part cooperates with the copper sleeve. The positioning structure formed by the valve sleeve installation part and the copper sleeve is used to fix the copper sleeve.

[0009] Preferably, the piston pressure plate is provided with a piston pressure plate mounting portion, which is stepped and matched with the valve sleeve. The positioning structure formed by the piston pressure plate mounting portion and the valve sleeve is used to fix the valve sleeve.

[0010] As a preferred embodiment, the piston pressing plate is provided with a plurality of connecting pieces, which penetrate the piston pressing plate and are fixed on the piston. The connecting pieces can be bolts, etc., and the piston pressing plate is fixed firmly and reliably with the connecting pieces, and is easy to disassemble and assemble.

[0011] Preferably, an O-ring is provided on the valve sleeve, and the O-ring is adapted to the valve sleeve, and the O-ring provides a seal between the piston, the piston pressure plate and the valve sleeve.

[0012] The beneficial effects of the utility model are:

[0013] The structure is simple, the processing is convenient, and the manufacturing cost is low. The piston pressure plate and the valve sleeve of the utility model have simple structures and are easy to process. In addition, the one-way oil-passing mechanism of the oil cylinder is formed by directly installing the copper sleeve, the valve core and the spring into the piston, which not only saves parts, but also makes the processing accuracy of the parts easier to control, thereby reducing the difficulty of processing and assembling parts, as well as the processing cost.

[0014] Improve the oil flow rate of the piston and the output speed of the piston's work. The utility model simplifies the structure and reduces the occupation of the cross-sectional area of ​​the oil passage, making the effective flow area of ​​the oil passage larger, thereby improving the oil flow rate and the output speed of the piston's work. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a structural schematic diagram of the piston pressure plate in the utility model.

[0017] Figure 3 It is a structural schematic diagram of the valve sleeve in the utility model.

[0018] Figure 4 It is a structural schematic diagram of the piston in the utility model.

[0019] Figure 5 The utility model is a structural schematic diagram of an oil cylinder.

[0020] In the figure, 1-piston pressure plate, 101-piston pressure plate mounting part, 2-valve sleeve, 201-valve sleeve mounting part, 202-auxiliary bolt hole, 3-copper sleeve, 4-valve core, 401-conical surface, 5-spring, 6-bolt, 7-O-ring, 8-piston, 801-axial oil channel, 802-oblique oil channel, 9-cylinder body, 901-rear baffle, 10-piston rod, 1001-center oil discharge chamber, 1002-oil discharge inlet, 1003-baffle, 11-power spring. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the specific embodiments of the drawings.

[0022] Embodiment 1:

[0023] like Figures 1 to 5As shown, a one-way oil flow mechanism for an oil cylinder is arranged on the piston 8 of the oil cylinder, and an oil flow channel is arranged in the piston 8. The two ends of the piston 8 are respectively a working end and a reset end, the working end faces the direction of piston power output, and the reset end faces the direction of piston 8 reset. The one-way oil flow mechanism for the oil cylinder includes a copper sleeve 3, a valve core 4, a spring 5, a piston pressure plate 1 and a valve sleeve 2. The copper sleeve 3, the valve core 4, the piston pressure plate 1 and the valve sleeve 2 are all rotating bodies, and the copper sleeve 3, the piston pressure plate 1 and the valve sleeve 2 all have a central through hole. The end of the valve core 4 facing the reset end of the piston 8 is inserted into the copper sleeve 3, forming a sleeve-insertion fit with the copper sleeve 3, and the valve core 4 and the copper sleeve 3 are clearance fits. The valve core 4 has a cavity with one end open, and a spring 5 is arranged in the cavity to enable the valve core 4 to automatically perform work output. The oil passage includes an axial oil passage 801 and two inclined oil passages 802. The axial oil passage 801 is located on the axis of the piston 8. The axial oil passage 801 axially penetrates the piston 8. The axial oil passage 801 is a multi-section structure, consisting of four sections, from the reset end of the piston 8 to the working end, which are the first section, the second section, the third section, and the fourth section, and the diameter of each section decreases in sequence, thereby forming three steps. The inclined oil passage 802 connects the end face of the piston 8 and the axial oil passage 801. The inner end of the inclined oil passage 802 is connected to the second section of the axial oil passage 801, and the outer ends of the two inclined oil passages 802 are connected to the intersection of the working end face of the piston 8 and the top surface of the piston 8 and the bottom surface of the piston 8. The copper sleeve 3, the valve core 4, the spring 5 and the valve sleeve 2 are all located in the axial oil passage 801. The end of the valve core 4 facing the working end of the piston 8 is adapted to be slidably inserted in the third section, the opening of the cavity faces the working end of the piston 8, one end of the spring 5 abuts on the closed end of the cavity, and the other end of the spring 5 abuts on the step between the third section and the fourth section. A conical surface 401 is provided on the circumference of the middle section of the valve core 4. Under normal conditions, the conical surface 401 is located near the junction of the first section and the second section. The inner edge of the port of the copper sleeve 3 abuts on the conical surface 401 to form an annular line contact sealing structure, which corresponds to the inner end of the inclined oil channel 802. The spring 5 allows the valve core 4 to automatically and elastically reset, maintaining the annular line contact sealing structure between the copper sleeve 3 and the conical surface 401.

[0024] The valve sleeve 2 is located in the first section of the axial oil passage 801 as a whole, and the outer diameter of the valve sleeve 2 is adapted to the inner diameter of the first section. The outer end face of the valve sleeve 2 is flush with the reset end face of the piston 8, and the inner end face of the valve sleeve 2 is in contact with the step between the first section and the second section. The piston pressure plate 1 is provided with 8 connecting parts, which are bolts 6. The bolts 6 penetrate the piston pressure plate 1 and are connected to the piston 8, so that the piston pressure plate 1 is installed and fixed on the reset end face of the piston 8. The copper sleeve 3 and the valve core 4 are located on the inner side of the valve sleeve 2, and the position in the piston 8 spans from the first section to the third section of the axial oil passage 801. The outer end of the valve sleeve 2, that is, the end face facing the reset end of the piston 8, is provided with an auxiliary bolt hole 202. The auxiliary bolt hole 202 is used to temporarily install auxiliary components such as a push rod, a pull ring, and a hook when the valve sleeve 2 is disassembled during maintenance and repair, so as to provide a reliable point of force for easy disassembly. The valve sleeve 2 is provided with an O-ring 7, which is adapted to fit in the O-ring installation groove on the outer peripheral surface of the valve sleeve 2. The O-ring is made of elastic material, which is nitrile rubber in this embodiment, which not only produces a good sealing effect, but also has a buffering function and reduces wear. The inner end of the valve sleeve 2, that is, the end facing the working end of the piston 8, is provided with a valve sleeve installation part 201 for matching with the copper sleeve 3. The valve sleeve installation part 201 is an inner hole type structure. The copper sleeve 3 is located in the valve sleeve installation part 201 as a whole. The axial length of the copper sleeve 3 is equal to the depth of the valve sleeve installation part 201, and the inner wall of the valve sleeve installation part 201 is adapted to fit the outer peripheral surface of the copper sleeve 3. The matching part of the piston pressure plate 1 is used to match with the valve sleeve 2. A piston pressure plate mounting portion 101 is provided on the piston pressure plate 1, and the piston pressure plate mounting portion 101 protrudes from the end surface of the piston pressure plate 1 to form a step. The piston pressure plate mounting portion 101 is used to cooperate with the piston 8, and the outer diameter of the piston pressure plate mounting portion 101 is adapted to the inner diameter of the first section port of the axial oil channel 801.

[0025] The one-way oil passing mechanism for the oil cylinder is applied to a dual-power oil cylinder, which includes a cylinder body 9, a piston rod 10 and a power spring 11. The cylinder body 9 has a front end and a rear end, the front end is an output end, and a rear baffle 901 is fixed to the rear end. The piston 8 is slidably arranged in the cylinder body 9, and the piston rod 10 is fixed to the working end of the piston 8. The piston rod 10 extends from the front end of the cylinder body 9. The piston rod 10 is a hollow structure, having a central oil discharge cavity 1001 and an oil discharge inlet 1002 connected to the central oil discharge cavity 1001, and the axis of the oil discharge inlet 1002 is perpendicular to the axis of the central oil discharge cavity 1001. The central oil discharge cavity 1001 is connected to the fourth section of the axial oil passage 801. A baffle 1003 is fixed to the exposed part of the piston rod 10, and the power spring 11 is sleeved outside the cylinder body 9, and the two ends of the power spring 11 are respectively abutted against the baffle 1003 and the rear baffle 901. The oil cylinder chamber corresponding to the working end of the piston 8 is connected to an oil pump. The power provided by the oil pump is only used to drive the piston 8 to reset, while the external working power of the piston 8 is provided by the power spring 11.

[0026] When the dual power cylinder outputs working power to the outside, the piston rod 10 needs to be converted from a retracted state to an extended state. At this time, the oil pump connected to the cylinder stops working and does not pressurize the cylinder chamber corresponding to the working end of the piston 8. The oil pressure in the chamber disappears, which is insufficient to counteract the elastic force of the power spring 11. The compressed power spring 11 recovers and stretches, pushing the piston 8 to move toward the cylinder chamber corresponding to the working end, causing the chamber to gradually shrink, and the oil inside it is also squeezed and discharged from the oil discharge inlet 1002. In the central oil discharge cavity 1001, since the water pump is not pressurized, the oil will automatically flow to the low pressure area. When the oil discharge speed of the central oil discharge cavity 1001 cannot adapt to the movement speed of the piston 8, the oil pressure in the cavity increases, and the pressurized oil is squeezed into the outer end of the inclined oil passage 802, and then reaches the annular line contact sealing structure along the inclined oil passage 802. The oil pressure acts on the conical surface 401, generating a lateral component force, pushing the valve core 4 to overcome the elastic force of the spring 5 and move toward the working end of the piston 8. The conical surface 401 of the valve core 4 is separated from the inner edge of the port of the copper sleeve 3. The gap between the valve core 4 and the copper sleeve 3 makes the oil flow path from the outer end of the inclined oil passage 802 to the inner end of the inclined oil passage 802, then to the central through hole of the copper sleeve 3, then to the central through hole of the valve sleeve 2, and finally to the central through hole of the piston pressure plate 1. The oil in the cylinder chamber corresponding to the working end of the piston 8 is transferred through the piston to the cylinder chamber corresponding to the reset end of the piston 8, thereby accelerating the emptying of the cylinder chamber corresponding to the working end of the piston 8, reducing the impedance encountered by the piston 8 when moving, and thus accelerating the movement of the piston 8 into position. On the contrary, when the piston 8 is reset, the oil pump is started, and the oil is injected from the central oil discharge cavity 1001 in the reverse direction, and then diffused to the oil cylinder chamber corresponding to the working end of the entire piston 8. The oil pressure pushes the piston 8 to overcome the elastic force of the power spring 11 and move to the rear end of the cylinder body 9. In this process, the oil pressure will also apply an axial thrust to the valve core 4 in the third section of the axial oil passage 801, so that the valve core 4 presses the copper sleeve 3. Although the pressurized oil will also enter the inclined oil passage 802 and produce a valve core on the conical surface 401 to promote 4 is separated from the copper sleeve 3 by a lateral force, but because the area of ​​the conical surface 401 is much smaller than the end surface area of ​​the valve core 4, even if the oil pressure is equal, the pressure at the conical surface 401 is still much smaller than the pressure on the end surface of the valve core 4, and the pressure at the conical surface 401 needs to be decomposed to obtain the effective thrust acting on the axial direction of the valve core 4. Therefore, the pressure at the conical surface 401 that separates the valve core 4 from the copper sleeve 3 is much smaller than the pressing force on the end surface of the valve core 4, thereby ensuring that there is no excessive oil in the piston 8 during the resetting process of the piston 8.

[0027] Embodiment 2:

[0028] like Figures 1 to 4As shown, a one-way oil flow mechanism for an oil cylinder is arranged on the piston 8 of the oil cylinder, and an oil flow channel is arranged in the piston 8. The two ends of the piston 8 are respectively a working end and a reset end, the working end faces the direction of the piston power output, and the reset end faces the direction of the piston 8 work output. The one-way oil flow mechanism for the oil cylinder includes a copper sleeve 3, a valve core 4, a spring 5, a piston pressure plate 1 and a valve sleeve 2. The copper sleeve 3, the valve core 4, the piston pressure plate 1 and the valve sleeve 2 are all rotating bodies, and the copper sleeve 3, the piston pressure plate 1 and the valve sleeve 2 all have a central through hole. The end of the valve core 4 facing the reset end of the piston 8 is inserted into the copper sleeve 3, forming a sleeve-insertion fit with the copper sleeve 3, and the valve core 4 and the copper sleeve 3 are clearance fits. The valve core 4 has a cavity with one end open, and a spring 5 is arranged in the cavity to enable the valve core 4 to automatically perform work output. The oil passage includes an axial oil passage 801 and two inclined oil passages 802. The axial oil passage 801 is located on the axis of the piston 8. The axial oil passage 801 axially penetrates the piston 8. The axial oil passage 801 is a multi-section structure, consisting of four sections, from the reset end of the piston 8 to the working end, which are the first section, the second section, the third section, and the fourth section, and the diameter of each section decreases in sequence, thereby forming three steps. The inclined oil passage 802 connects the end face of the piston 8 and the axial oil passage 801. The inner end of the inclined oil passage 802 is connected to the second section of the axial oil passage 801, and the outer ends of the two inclined oil passages 802 are connected to the intersection of the working end face of the piston 8 and the top surface of the piston 8 and the bottom surface of the piston 8. The copper sleeve 3, the valve core 4, the spring 5 and the valve sleeve 2 are all located in the axial oil passage 801. The end of the valve core 4 facing the working end of the piston 8 is adapted to be slidably inserted in the third section, the opening of the cavity faces the working end of the piston 8, one end of the spring 5 abuts on the closed end of the cavity, and the other end of the spring 5 abuts on the step between the third section and the fourth section. A conical surface 401 is provided on the circumference of the middle section of the valve core 4. Under normal conditions, the conical surface 401 is located near the junction of the first section and the second section. The inner edge of the port of the copper sleeve 3 abuts on the conical surface 401 to form an annular line contact sealing structure, which corresponds to the inner end of the inclined oil channel 802. The spring 5 allows the valve core 4 to automatically and elastically reset, maintaining the annular line contact sealing structure between the copper sleeve 3 and the conical surface 401.

[0029] The valve sleeve 2 is located in the first section of the axial oil passage 801 as a whole, and the outer diameter of the valve sleeve 2 is matched with the inner diameter of the first section. The outer end face of the valve sleeve 2 is flush with the reset end face of the piston 8, and the inner end face of the valve sleeve 2 is in contact with the step between the first section and the second section. Different from the first embodiment, the piston pressure plate 1 is provided with 7 connecting parts, which are bolts 6. The bolts 6 penetrate the piston pressure plate 1 and are connected to the piston 8, so that the piston pressure plate 1 is fixed on the reset end face of the piston 8. The copper sleeve 3 and the valve core 4 are located on the inner side of the valve sleeve 2, and the position in the piston 8 spans from the first section to the third section of the axial oil passage 801. The outer end of the valve sleeve 2, that is, the end face facing the reset end of the piston 8, is provided with an auxiliary bolt hole 202, which is used to temporarily install auxiliary components such as a push rod, a pull ring, and a hook when the valve sleeve 2 is disassembled during maintenance and repair, so as to provide a reliable point of force for easy disassembly. The valve sleeve 2 is provided with an O-ring 7, which is adapted to fit in the O-ring installation groove on the outer peripheral surface of the valve sleeve 2. The O-ring is made of elastic material, which is nitrile rubber in this embodiment, which not only produces a good sealing effect, but also has a buffering function and reduces wear. The inner end of the valve sleeve 2, that is, the end facing the working end of the piston 8, is provided with a valve sleeve installation part 201 for matching with the copper sleeve 3. The valve sleeve installation part 201 is an inner hole type structure. The copper sleeve 3 is located in the valve sleeve installation part 201 as a whole. The axial length of the copper sleeve 3 is equal to the depth of the valve sleeve installation part 201, and the inner wall of the valve sleeve installation part 201 is adapted to fit the outer peripheral surface of the copper sleeve 3. The matching part of the piston pressure plate 1 is used to match with the valve sleeve 2. A piston pressure plate mounting portion 101 is provided on the piston pressure plate 1, and the piston pressure plate mounting portion 101 protrudes from the end surface of the piston pressure plate 1 to form a step. The piston pressure plate mounting portion 101 is used to cooperate with the piston 8, and the outer diameter of the piston pressure plate mounting portion 101 is adapted to the inner diameter of the first section port of the axial oil channel 801.

[0030] The one-way oil passing mechanism of the oil cylinder is applied to a dual-power oil cylinder. Different from the embodiment 1, the dual-power oil cylinder includes a cylinder body 9, a piston rod 10 and an electric push rod controlled by a controller. The cylinder body 9 has a front end and a rear end, and the front end is the output end. The piston 8 is slidably arranged in the cylinder body 9, and the piston rod 10 is fixed at the working end of the piston 8. The piston rod 10 extends from the front end of the cylinder body 9. The piston rod 10 is a hollow structure, having a central oil discharge cavity 1001 and an oil discharge inlet 1002 connected to the central oil discharge cavity 1001, and the axis of the oil discharge inlet 1002 is perpendicular to the axis of the central oil discharge cavity 1001. The central oil discharge cavity 1001 is connected to the fourth section of the axial oil channel 801. The exposed part of the piston rod 10 is connected to the electric push rod through a connecting block. The oil cylinder chamber corresponding to the working end of the piston 8 is connected to an oil pump. The power provided by the oil pump is only used to drive the piston 8 to reset, and the external working power of the piston 8 is provided by the electric push rod.

[0031] When the dual-power oil cylinder outputs working power to the outside, the piston rod 10 needs to be converted from a retracted state to an extended state. At this time, the oil pump connected to the oil cylinder stops working and does not pressurize the oil cylinder chamber corresponding to the working end of the piston 8. The oil pressure in the chamber disappears, and the electric push rod is powered on and started under the control of the controller to push the piston 8 to move toward the oil cylinder chamber corresponding to the working end, so that the chamber gradually shrinks, and the oil inside it is also squeezed and discharged from the oil discharge inlet 1002. In the central oil discharge cavity 1001, since the water pump is not pressurized, the oil will automatically flow to the low pressure area. When the oil discharge speed of the central oil discharge cavity 1001 cannot adapt to the movement speed of the piston 8, the oil pressure in the cavity increases, and the pressurized oil is squeezed into the outer end of the inclined oil passage 802, and then reaches the annular line contact sealing structure along the inclined oil passage 802. The oil pressure acts on the conical surface 401, generating a lateral component force, pushing the valve core 4 to overcome the elastic force of the spring 5 and move toward the working end of the piston 8. The conical surface 401 of the valve core 4 is separated from the inner edge of the port of the copper sleeve 3. The gap between the valve core 4 and the copper sleeve 3 makes the oil flow path from the outer end of the inclined oil passage 802 to the inner end of the inclined oil passage 802, then to the central through hole of the copper sleeve 3, then to the central through hole of the valve sleeve 2, and finally to the central through hole of the piston pressure plate 1. The oil in the cylinder chamber corresponding to the working end of the piston 8 is transferred through the piston to the cylinder chamber corresponding to the reset end of the piston 8, thereby accelerating the emptying of the cylinder chamber corresponding to the working end of the piston 8, reducing the impedance encountered by the piston 8 when moving, and thus accelerating the movement of the piston 8 into position. On the contrary, when the piston 8 is reset, the electric push rod is powered off and can freely extend and retract under the action of external force. The oil pump is started, and the oil is reversely injected from the central oil discharge cavity 1001, and then diffused to the oil cylinder chamber corresponding to the working end of the entire piston 8. The oil pressure pushes the piston 8 to move toward the rear end of the cylinder body 9. In this process, the oil pressure will also apply axial thrust to the valve core 4 in the third section of the axial oil channel 801, so that the valve core 4 presses the copper sleeve 3. Although the pressurized oil will also enter the inclined oil channel 802 and produce on the conical surface 401 A lateral force is generated to promote the separation of the valve core 4 and the copper sleeve 3. However, since the area of ​​the conical surface 401 is much smaller than the end surface area of ​​the valve core 4, even if the oil pressure is equal, the pressure at the conical surface 401 is still much smaller than the pressure on the end surface of the valve core 4, and the pressure at the conical surface 401 needs to be decomposed to obtain the effective thrust acting on the axial direction of the valve core 4. Therefore, the pressure at the conical surface 401 that separates the valve core 4 and the copper sleeve 3 is much smaller than the clamping force on the end surface of the valve core 4, thereby ensuring that there is no excessive oil in the piston 8 during the resetting process of the piston 8.

Claims

1. A one-way oil-passing mechanism for an oil cylinder, arranged on a piston (8) of the oil cylinder, characterized in that: The invention comprises a copper sleeve (3) and a valve core (4), wherein the copper sleeve (3) is sleeved on one end of the valve core (4), the valve core (4) has a cavity, a spring (5) is arranged in the cavity for automatically returning the valve core (4), an oil passage is arranged in the piston (8), and the copper sleeve (3) and the valve core (4) are embedded in the oil passage.

2. The one-way oil-passing mechanism for a cylinder according to claim 1 is characterized in that: It also includes a piston pressure plate (1) and a valve sleeve (2), wherein the valve sleeve (2) is built into the oil passage and close to an end face of the piston (8), and the piston pressure plate (1) is mounted on the end face of the piston (8) where the valve sleeve is located.

3. The one-way oil-passing mechanism for a cylinder according to claim 1 is characterized in that: A conical surface (401) is provided on the outer peripheral surface of the valve core (4), and the inner edge of the port of the copper sleeve (3) contacts the conical surface (401).

4. The one-way oil-passing mechanism for a cylinder according to claim 1 is characterized in that: The oil passage comprises an axial oil passage (801) and an inclined oil passage (802); the inclined oil passage (802) is connected to the end surface of the piston (8) and the axial oil passage (801); the copper sleeve (3), the valve core (4), and the valve sleeve (2) are all located in the axial oil passage (801).

5. The one-way oil-passing mechanism for a cylinder according to claim 2 is characterized in that: A valve sleeve mounting portion is provided on the valve sleeve (2), the valve sleeve mounting portion is an inner hole type structure, and the valve sleeve mounting portion cooperates with the copper sleeve (3).

6. The one-way oil-passing mechanism for a cylinder according to claim 2, characterized in that: A piston pressure plate mounting portion is provided on the piston pressure plate (1), the piston pressure plate mounting portion is step-shaped, and the piston pressure plate mounting portion cooperates with the valve sleeve (2).

7. The one-way oil-passing mechanism for a cylinder according to claim 1 is characterized in that: A plurality of connecting pieces are provided on the piston pressure plate (1), and the connecting pieces penetrate the piston pressure plate (1) and are fixed on the piston (8).

8. The one-way oil transfer mechanism for a cylinder according to any one of claims 1 to 7, characterized in that: An O-ring (7) is provided on the valve sleeve (2), and the O-ring (7) is adapted to the valve sleeve (2).

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