Oil cylinder buffer column integrated with one-way valve and oil cylinder with same

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to an oil cylinder buffering column integrated with a one-way valve and an oil cylinder with the oil cylinder buffering column. The oil cylinder buffering column comprises a buffering part, and an oil hole and a throttling hole communicated with the oil hole are formed in the buffering part; the valve body part and the buffering part are integrally formed, and a stepped hole and a through hole communicating with the stepped hole are formed in the valve body part; a spring and a steel ball are arranged in the stepped hole, the spring abuts against the steel ball, and when the steel ball is located at the end, close to the oil hole, of the stepped hole, the steel ball blocks a channel between the oil hole and the through hole. The oil cylinder comprises a cylinder barrel, and an oil port is formed in a cylinder cover; the piston is arranged in the cylinder barrel and can axially slide along the cylinder barrel; wherein the valve body part is connected with the piston, and one end of the buffer part is inserted into the oil port. The buffer column integrated with the one-way valve has the functions of buffering when the piston rod retracts and reducing starting pressure when the piston rod stretches out, and has the advantages of being compact in structure, convenient to machine and capable of saving materials.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic cylinders, and in particular to an oil cylinder buffer column with an integrated one-way valve and an oil cylinder having the same. Background Art

[0002] As a hydraulic actuator that provides push and pull force, high-pressure cylinders are widely used in industrial equipment. During the rapid retraction of the cylinder, in order to prevent the piston rod from frequently colliding with the cylinder head and affecting the life of the cylinder, a buffer column is generally installed at the bottom of the piston rod to play a throttling and buffering role. Secondly, when the cylinder is extended, in order to reduce the starting pressure of the cylinder, a hole is punched on the cylinder head and a check valve is installed. When the starting pressure is high, the hydraulic oil can push the steel ball on the check valve and flow to the rod cavity through the slender hole on the check valve, thereby increasing the pressure area during startup and reducing the starting pressure. However, the existing check valve and buffer column are independent entities. The buffer column only plays a buffering role, and the check valve needs to be punched and installed on the cylinder head. The hole for installing the check valve needs to be away from the weld, and there are requirements for the length and diameter of the cylinder head. In addition, the slender hole connecting the check valve and the rod cavity is difficult to process and takes a long time to process. Utility Model Content

[0003] The technical problem to be solved by the utility model is that the existing one-way valve and the buffer column are independent entities, and when they are installed in the oil cylinder at the same time, the installation is difficult and the length of the cylinder body is easily increased.

[0004] To this end, the utility model provides an oil cylinder buffer column with an integrated one-way valve and an oil cylinder having the same.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A cylinder buffer column with an integrated one-way valve, comprising

[0007] A buffer part, wherein an oil hole is opened on the buffer part along its axial direction, and a throttling hole connected with the oil hole is arranged on the buffer part;

[0008] A valve body portion, the valve body portion is coaxially connected to the buffer portion, the valve body portion is provided with a step hole, and the valve body portion is provided with a through hole communicating with the step hole;

[0009] A steel ball, wherein the steel ball is arranged in the step hole to roll along the axial direction of the step hole, and when the steel ball is located at one end of the step hole close to the oil hole, the steel ball blocks the passage between the oil hole and the through hole;

[0010] A spring, wherein the spring is arranged in the step hole and abuts against the steel ball;

[0011] Wherein, the oil hole is communicated with the step hole.

[0012] By adopting the above technical solution, the buffer part and the valve body are integrated together, and the structure is compact. During the installation process, the valve body is connected to the piston, and the buffer part is inserted into the oil port on the cylinder head, so there is no need to drill a hole on the cylinder head to install a one-way valve. The length of the cylinder head is not limited, so the overall length of the oil cylinder will not be increased. The buffer column has the functions of buffering and reducing the starting pressure, is easy to install, saves materials, and is easy to process.

[0013] Furthermore, an intermediate portion is integrally provided between the valve body portion and the buffer portion, a transition hole is provided on the intermediate portion, the oil hole, the transition hole and the step hole are coaxially arranged and interconnected, and the diameter of the steel ball is smaller than the inner diameter of the step hole and larger than the inner diameter of the transition hole.

[0014] By adopting the above technical solution, the setting of the transition hole prevents the steel ball from falling out of the step hole, and when the hydraulic oil flows toward the steel ball and pushes the steel ball, the diameter of the transition hole is small, thereby enhancing the flow rate of the hydraulic oil through the transition hole, increasing the force to push the steel ball open, and quickly starting the oil cylinder.

[0015] Furthermore, a plurality of through holes are arranged along the circumference of the valve body.

[0016] By adopting the above technical solution, when the steel ball is pushed open by the hydraulic oil, the multiple through holes quickly increase the contact area, so that the oil pressure force area is increased, thereby effectively reducing the starting pressure of the oil cylinder.

[0017] Furthermore, a plurality of throttling holes are arranged along the axial direction of the oil hole.

[0018] Further, the throttling hole extends in a radial direction of the buffer portion, and the through hole extends in a radial direction of the valve body portion.

[0019] Furthermore, one end of the valve body away from the buffer portion is threadedly connected with a screw plug.

[0020] Furthermore, a boss is provided on one end of the valve body away from the buffer portion.

[0021] A cylinder having a cylinder buffer column with an integrated one-way valve as described above, further comprising:

[0022] Cylinder, and

[0023] A cylinder head, the cylinder head is connected to the bottom of the cylinder barrel, and an oil port is provided on the cylinder head;

[0024] A piston, the piston is disposed in the cylinder and can slide axially along the cylinder;

[0025] A piston rod, which is inserted into the cylinder and connected to the piston;

[0026] The valve body is connected to the piston, one end of the buffer is inserted into one end of the oil port close to the cylinder, and the through hole is always connected to the inside of the cylinder.

[0027] Furthermore, a mounting hole is provided on the piston, and the boss on the valve body is clamped in the mounting hole.

[0028] Furthermore, an end of the oil port away from the cylinder barrel is connected with an oil port screw plug.

[0029] The beneficial effect of the utility model is that, during the process of the oil cylinder piston rod retracting to the bottom, the buffer part of the column is gradually inserted into the cylinder head, the oil passing area is gradually reduced, and the hydraulic oil can only pass through the gap between the oil hole and the column and the oil port on the cylinder head. Back pressure is formed on the cylinder head side, which slows down the outflow of hydraulic oil and reduces the retraction speed of the piston rod, thereby playing a buffering role. At the same time, during the process of the piston rod extending, the hydraulic oil pushes the steel ball installed in the step hole from the oil hole, fills the rodless cavity of the oil cylinder with oil, increases the oil pressure area of ​​the piston rod, and reduces the starting pressure of the oil cylinder. This kind of buffer column with an integrated one-way valve not only has a buffering effect, but also increases the effect of reducing the starting pressure of the oil cylinder when the piston rod is extended. It also has the advantages of compact structure, convenient processing, and material saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Figure 1 It is a cross-sectional view of an oil cylinder buffer column with an integrated one-way valve in the utility model.

[0032] Figure 2 It is a cross-sectional view of an oil cylinder of an oil cylinder buffer column with an integrated one-way valve in the utility model.

[0033] Figure 3 It is used to reflect Figure 2 Enlarged view of part A showing the installation relationship between the middle cylinder buffer column and the cylinder.

[0034] In the figure: 1. Cylinder; 11. Buffer part; 111. Oil hole; 112. Throttle hole; 12. Middle part; 121. Transition hole; 13. Valve body; 131. Step hole; 132. Through hole; 133. Boss; 2. One-way valve assembly; 21. Spring; 22. Steel ball; 23. Screw plug; 3. Cylinder barrel; 4. Cylinder head; 5. Piston; 6. Piston rod; 7. Oil port; 8. Oil port screw plug. DETAILED DESCRIPTION

[0035] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0036] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Reference Figure 1 A cylinder buffer column with an integrated one-way valve includes a column body 1 and a one-way valve assembly 2, wherein the one-way valve assembly 2 is arranged in the column body 1. The column body 1 includes a buffer portion 11, an intermediate portion 12 and a valve body portion 13, wherein the buffer portion 11, the intermediate portion 12 and the valve body portion 13 are integrally formed, wherein the intermediate portion 12 is arranged between the buffer portion 11 and the valve body portion 13, and a boss 133 is arranged on a side of the valve body portion 13 away from the buffer portion 11.

[0039] An oil hole 111 is provided on the buffer portion 11 along the axial direction of the column 1, and the oil hole 111 is coaxially arranged with the column 1. The end of the oil hole 111 away from the valve body portion 13 is arranged in a trumpet shape, and a plurality of throttle holes 112 are provided on the buffer portion 11, and the plurality of throttle holes 112 are arranged along the axial direction of the column 1, and the throttle holes 112 penetrate the column 1 to control the flow rate of the hydraulic oil. In this embodiment, the axial direction of the throttle hole 112 is arranged along the radial direction of the column 1, and the throttle hole 112 extends radially through the column 1. In other embodiments, there may be an angle between the axial direction of the throttle hole 112 and the axial direction of the column 1, and the end of the throttle hole 112 away from the oil hole 111 may also be arranged in a trumpet shape.

[0040] A step hole 131 is provided on the valve body 13 along the axial direction of the column 1, and the step hole 131 is coaxially arranged with the column 1. A through hole 132 is provided at a position of the valve body 13 near the middle portion 12, and a plurality of through holes 132 are provided along the circumference of the column 1. The through holes 132 penetrate the column 1 and are connected with the step hole 131 and the oil hole 111. In this embodiment, the axial direction of the through hole 132 is arranged along the radial direction of the column 1, and the through hole 132 extends radially through the column 1. In other embodiments, there may be an angle between the axial direction of the through hole 132 and the axial direction of the column 1, and the end of the step hole 131 away from the buffer portion 11 is arranged in a trumpet shape.

[0041] The one-way valve assembly 2 includes a spring 21, a steel ball 22 and a screw plug 23. More specifically, when the spring 21, the steel ball 22 and the screw plug 23 are accommodated and arranged in the valve body 13, the three are in contact with each other in sequence. The diameter of the steel ball 22 is slightly smaller than the inner diameter of the step hole 131. The steel ball 22 is arranged in the step hole 131 in a rolling manner along the axial direction of the step hole 131. The inner side wall of the step hole 131 away from the buffer portion 11 is provided with an internal thread for threaded connection with the screw plug 23. The spring 21 is arranged between the screw plug 23 and the steel ball 22. After the steel ball 22 and the spring 21 are sequentially installed in the step hole 131, they can be fixed and locked with the screw plug 23.

[0042] A transition hole 121 is formed on the middle portion 12 along the axial direction of the column 1 , and the transition hole 121 is coaxially arranged with the column 1 . The diameter of the steel ball 22 is smaller than the inner diameter of the step hole 131 and larger than the inner diameter of the transition hole 121. Therefore, the steel ball 22 can stably roll in the step hole 131 along the axial direction of the step hole 131. The diameter of the steel ball 22 is larger than the diameter of the transition hole 121, so that the steel ball 22 will not escape from the step hole 131 and can block the passage between the oil hole 111 and the through hole 132. When the steel ball 22 is located at one end of the step hole 131 close to the middle part 12, the steel ball 22 is opposite to the through hole 132. At this time, the center of the steel ball 22 is located at the intersection of the axis of the through hole 132 and the axis of the step hole 131. This position is the initial position of the steel ball 22. Therefore, when the steel ball 22 is in the initial position, the steel ball 22 blocks the passage between the oil hole 111 and the through hole 132, so that the hydraulic oil cannot enter the oil cylinder through the through hole 132. It is worth noting that the axial direction refers to the length direction along the column 1, and the radial direction refers to the direction perpendicular to the length direction of the column 1.

[0043] Reference Figure 2 , 3 A cylinder having an oil cylinder buffer column with an integrated one-way valve comprises the above-mentioned oil cylinder buffer column with an integrated one-way valve, a cylinder cover 4, a cylinder barrel 3, a piston 5 and a piston rod 6.

[0044] The cylinder head 4 is connected to one side of the cylinder barrel 3. A guide sleeve may be provided at the open end of the cylinder barrel 3. The piston 5 is fixedly connected to the piston rod 6. The piston 5 and the piston rod 6 are slidably connected to the cylinder barrel 3 along the axial direction of the cylinder barrel 3. The piston rod 6 passes through the guide sleeve and slides with the guide sleeve. The guide sleeve guides and supports the piston rod 6.

[0045] The piston 5 is provided with a mounting hole, and the boss 133 on the valve body 13 is clamped in the mounting hole to achieve the installation between the column 1 and the piston 5 .

[0046] The cylinder head 4 is provided with an oil port 7, which is arranged along the axial direction of the cylinder barrel 3. An oil port plug 8 is connected to the end of the cylinder head 4 away from the cylinder barrel 3. The oil port plug 8 is threadedly connected to the cylinder head 4. When no external oil pipe is needed, the oil port plug 8 can be used to seal the oil port 7 on the cylinder head 4.

[0047] In the actual working process, the starting pressure of the oil cylinder is relatively high due to the need to overcome external forces and the resistances such as the gravity and friction of the piston rod 6 itself, and a lower starting pressure cannot move the piston rod 6. In this embodiment, when the oil cylinder is started, the external oil pipe and hydraulic oil will enter from the oil port 7 of the cylinder head 4, and the pressure acts on the end face of the buffer part 11. The hydraulic oil enters the column 1, and passes through the oil hole 111 and the transition hole 121 in turn. The oil pressure acts on the steel ball 22. When the oil pressure is greater than the set pressure of the spring 21, the steel ball 22 is pushed open and enters the step hole 131. At this time, the hydraulic oil can enter the cylinder barrel 3 from the through hole 132 on the buffer column, and the entire piston 5 is subjected to the oil pressure, so that the oil pressure force area is increased, thereby effectively reducing the starting pressure of the oil cylinder.

[0048] When the oil cylinder retracts, the piston 5 quickly moves toward the cylinder head 4, and the hydraulic oil is squeezed and flows out of the oil cylinder from the oil port 7 of the cylinder head 4. When the buffer column enters the cylinder head 4, the hydraulic oil in the cylinder barrel 3 can simultaneously flow out of the oil cylinder from the throttle hole 112, the oil hole 111, and the gap between the column 1 and the cylinder head 4. Figure 3 As the buffer column gradually enters, the multiple throttle holes 112 arranged axially also enter the cylinder head 4 in turn, and the throttle holes 112 away from the valve body 13 gradually lose the function of passing the hydraulic oil, and the oil passing area gradually decreases; when all the throttle holes 112 completely enter the cylinder head 4, all the throttle holes 112 lose the oil passing function, and the oil passing area is reduced to the minimum. At this time, the hydraulic oil can only flow out of the oil cylinder from the gap between the column 1 and the cylinder head 4. On the contrary, due to the reduction of the oil passing area, the back pressure at the oil port 7 of the cylinder head 4 increases, which hinders the hydraulic oil from flowing out of the oil cylinder, thereby reducing the moving speed of the piston 5 and the piston rod 6, and playing a buffering role.

[0049] In summary, when the oil cylinder piston rod 6 is retracted to the bottom, the column 1 is gradually inserted into the oil port 7 of the cylinder head 4, the oil flow area is gradually reduced, and back pressure is formed on the side of the cylinder head 4, which slows down the outflow of hydraulic oil and reduces the retraction speed of the piston rod 6, thereby playing a buffering role. At the same time, when the piston rod 6 is extended, the hydraulic oil pushes the steel ball 22 installed in the column 1 from the oil hole 111 in the column 1, fills the rodless chamber in the cylinder 3 with oil, increases the oil pressure area of ​​the piston 5, and reduces the starting pressure of the oil cylinder. This buffer column with an integrated one-way valve has the functions of buffering when the piston rod 6 is retracted and reducing the starting pressure when the piston rod 6 is extended, and also has the advantages of compact structure, convenient processing, and material saving.

[0050] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A cylinder buffer column with an integrated one-way valve, characterized in that: include: A buffer portion (11), wherein an oil hole (111) is provided on the buffer portion (11) along its axial direction, and a throttling hole (112) is provided on the buffer portion (11) and is communicated with the oil hole (111); a valve body portion (13), the valve body portion (13) being coaxially connected to the buffer portion (11), the valve body portion (13) being provided with a step hole (131) communicating with the oil hole (111) along its axial direction, and the valve body portion (13) being provided with a through hole (132) communicating with the oil hole (111) and the step hole (131); a steel ball (22), the steel ball (22) being arranged in a rolling manner in the step hole (131); when the steel ball (22) is located at one end of the step hole (131) close to the oil hole (111), the steel ball (22) blocks the passage between the oil hole (111) and the through hole (132); A spring (21), wherein the spring (21) is arranged in the step hole (131), and the spring (21) abuts against the steel ball (22).

2. The cylinder buffer column with integrated one-way valve according to claim 1, characterized in that: An intermediate portion (12) is integrally arranged between the valve body portion (13) and the buffer portion (11), and a transition hole (121) is arranged on the intermediate portion (12). The oil hole (111), the transition hole (121), and the step hole (131) are coaxially arranged and interconnected, and the diameter of the steel ball (22) is smaller than the inner diameter of the step hole (131) and larger than the inner diameter of the transition hole (121).

3. The cylinder buffer column with integrated one-way valve according to claim 1, characterized in that: A plurality of through holes (132) are provided along the circumference of the valve body portion (13).

4. The cylinder buffer column with integrated one-way valve according to claim 1, characterized in that: A plurality of throttling holes (112) are arranged along the axial direction of the buffer portion (11).

5. The cylinder buffer column with integrated one-way valve according to claim 1, characterized in that: The throttle hole (112) extends in the radial direction of the buffer portion (11), and the through hole (132) extends in the radial direction of the valve body portion (13).

6. The cylinder buffer column with integrated one-way valve according to claim 1, characterized in that: A screw plug (23) is connected to one end of the valve body (13) away from the buffer portion (11), and the screw plug (23) abuts against the spring (21).

7. The cylinder buffer column with integrated one-way valve according to claim 1, characterized in that: A boss (133) is provided on a side of the valve body portion (13) away from the buffer portion (11).

8. A cylinder having a cylinder buffer column with an integrated one-way valve as claimed in any one of claims 1 to 7, characterized in that: Also includes: a cylinder (3), and A cylinder head (4), the cylinder head (4) being connected to one side of the cylinder barrel (3), and the cylinder head (4) being provided with an oil port (7); A piston (5), wherein the piston (5) is disposed in the cylinder (3) and is axially slidable along the cylinder (3); A piston rod (6), wherein the piston rod (6) is inserted into the cylinder (3) and connected to the piston (5); The valve body (13) is connected to the piston (5), and one end of the buffer portion (11) away from the valve body (13) is inserted into the oil port (7).

9. The oil cylinder of the oil cylinder buffer column with integrated one-way valve according to claim 8, characterized in that: The piston (5) is provided with a mounting hole, and the boss (133) on the valve body (13) is clamped in the mounting hole.

10. The oil cylinder of the oil cylinder buffer column with integrated one-way valve according to claim 8, characterized in that: An end of the oil port (7) away from the cylinder barrel (3) is connected to an oil port screw plug (8).

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