Lifting oil cylinder and engineering machinery

Abstract

The utility model provides a lift cylinder and engineering machinery wherein the lift cylinder comprises: a cylinder body and a piston rod movably arranged in the cylinder body, the piston rod divides the space in the cylinder body into a rod cavity and a rodless cavity, the cylinder body is provided with a first via hole and a second via hole, the first via hole is communicated with the rod cavity, and the second via hole is communicated with the rodless cavity; the cartridge valve is arranged on the cylinder body and comprises a valve body and a valve element movably arranged in the valve body, an oil inlet and an oil outlet are formed in the valve body, the first end of the valve element is suitable for being matched with the oil inlet, an elastic reset piece is arranged between the second end of the valve element and the valve body, and the valve element has a blocking position for closing the oil inlet and a blocking position for opening the oil inlet. And at the communication position where the oil inlet communicates with the oil outlet, the oil inlet communicates with the first via hole, and the oil outlet communicates with the second via hole. In the structure, the lifting oil cylinder can have both pressure maintaining and buffering performance, and the defect that in the prior art, a lifting oil cylinder cannot meet the buffering requirement is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a lifting oil cylinder and engineering machinery. Background Art

[0002] In construction machinery with a rammer (such as a rammer), the soil on the ground is compacted by the high-speed reciprocating up and down impact of the rammer. The lifting of the rammer is achieved by a lifting cylinder. The usual structure is that the lifting cylinder pulls the pulley block to move, the pulley block drives the rammer to rise, and then the rammer falls by gravity. Since the impact frequency of the rammer is high and the impact force is large, this requires the lifting cylinder to have high pressure maintenance and buffering performance, but the lifting cylinder in the prior art is difficult to take both into account and cannot meet the buffering requirements. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the lifting cylinder in the prior art cannot meet the buffering requirement, thereby providing a lifting cylinder and engineering machinery.

[0004] In order to solve the above problems, the utility model provides a lifting cylinder, comprising: a cylinder body and a piston rod movably arranged in the cylinder body, the piston rod divides the space in the cylinder body into a rod chamber and a rodless chamber, a first through hole and a second through hole are arranged on the cylinder body, the first through hole is connected to the rod chamber, and the second through hole is connected to the rodless chamber; a cartridge valve is arranged on the cylinder body, the cartridge valve comprises a valve body and a valve core movably arranged in the valve body, an oil inlet and an oil outlet are arranged on the valve body, a first end of the valve core is suitable for cooperating with the oil inlet, an elastic reset member is arranged between the second end of the valve core and the valve body, the valve core has a blocking position for closing the oil inlet, and a connecting position for opening the oil inlet so that the oil inlet is connected to the oil outlet, the oil inlet is connected to the first through hole, and the oil outlet is connected to the second through hole.

[0005] Optionally, the cartridge valve is provided with a buffer structure.

[0006] Optionally, the cartridge valve also includes a valve seat, which is arranged at the end of the cylinder body facing the rod cavity, an installation cavity is arranged in the valve seat, a third through hole and a fourth through hole are arranged on the valve seat, the valve core is arranged in the installation cavity, and the oil inlet is connected to the third through hole, the oil outlet is connected to the fourth through hole, the third through hole is connected to the first through hole, and the fourth through hole is connected to the second through hole.

[0007] Optionally, the lifting cylinder further includes a tube body, one end of which is connected to the valve seat and communicated with the fourth through hole, and the other end of which is connected to the cylinder body and communicated with the second through hole.

[0008] Optionally, the lifting cylinder further comprises a support frame, which is arranged on the cylinder body and is suitable for supporting the pipe body.

[0009] Optionally, the cartridge valve further comprises a valve cover, which is arranged on the valve seat and closes the installation cavity, the valve body is a cylindrical structure with openings at both ends, and both ends of the elastic reset member are respectively in contact with the valve core and the valve cover.

[0010] Optionally, the valve body is a cylindrical structure with openings at both ends, one end of the valve body is opened to form an oil inlet, the oil outlet is arranged on the side wall of the valve body, the third through hole is arranged on the bottom wall of the valve seat, and the fourth through hole is arranged on the side wall of the valve seat.

[0011] Optionally, a plurality of installation cavities are provided in the valve seat, a plurality of third through holes and a plurality of fourth through holes are provided on the valve seat, and the plurality of third through holes and the plurality of fourth through holes are connected to the plurality of installation cavities in a one-to-one correspondence.

[0012] Optionally, there are multiple valve seats, and the multiple valve seats are circumferentially arranged on the cylinder body.

[0013] The utility model also provides an engineering machine, comprising a rammer and a lifting cylinder connected to the rammer, wherein the lifting cylinder is the above-mentioned lifting cylinder.

[0014] The utility model has the following advantages:

[0015] By utilizing the technical solution of the utility model, a cartridge valve is provided on the cylinder body of the lifting cylinder. When the piston rod is retracted, the elastic force provided by the elastic reset member is greater than the pressure at the first through hole, so that the valve core is in a closed position. At this time, the cartridge valve isolates the rod chamber and the rodless chamber of the cylinder body to achieve pressure maintenance of the lifting cylinder. When the piston rod is extended, the pressure at the first through hole is greater than the elastic force of the elastic reset member, so that the valve core is in a connected position. At this time, the pressure generated by the high-speed impact causes a part of the hydraulic oil to flow back from the rod chamber to the rodless chamber through the cartridge valve, thereby playing a buffering role. In the above structure, the lifting cylinder can take into account both pressure maintenance and buffering performance, which solves the defect that the lifting cylinder in the prior art cannot meet the buffering requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A cross-sectional schematic diagram of the lifting cylinder of the utility model is shown;

[0018] Figure 2 Shows Figure 1 The enlarged schematic diagram at A in the middle;

[0019] Figure 3 Shows Figure 1 The enlarged schematic diagram of point B in the middle;

[0020] Figure 4 Another cross-sectional schematic diagram of the lifting cylinder of the utility model is shown; and

[0021] Figure 5 Shows Figure 1 Side view of the center lift cylinder (section view of the cartridge valve).

[0022] Description of reference numerals:

[0023] 10. Cylinder body; 11. Rod chamber; 12. Rodless chamber; 13. First through hole; 14. Second through hole; 20. Cartridge valve; 21. Valve body; 211. Oil inlet; 212. Oil outlet; 22. Valve core; 23. Elastic reset member; 24. Valve seat; 241. Third through hole; 242. Fourth through hole; 25. Installation chamber; 26. Valve cover; 30. Tube body; 40. Support frame; 50. Piston rod. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] 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 an indirect connection 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.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figures 1 to 4 As shown, an embodiment of the lifting cylinder according to the present application includes a cylinder body 10, a piston rod 50 and a cartridge valve 20. The piston rod 50 is movably arranged in the cylinder body 10, and the piston rod 50 divides the space in the cylinder body 10 into a rod chamber 11 and a rodless chamber 12. A first through hole 13 and a second through hole 14 are arranged on the cylinder body 10, the first through hole 13 is connected to the rod chamber 11, and the second through hole 14 is connected to the rodless chamber 12. The cartridge valve 20 is arranged on the cylinder body 10, and the cartridge valve 20 includes a valve body 21 and a valve core 22 movably arranged in the valve body 21, and an oil inlet 211 and an oil outlet 212 are arranged on the valve body 21. The first end of the valve core 22 is suitable for cooperating with the oil inlet 211, and an elastic reset member 23 is arranged between the second end of the valve core 22 and the valve body 21. The valve core 22 has a blocking position for closing the oil inlet 211 , and a communicating position for opening the oil inlet 211 so that the oil inlet 211 communicates with the oil outlet 212 .

[0029] Furthermore, the oil inlet 211 is communicated with the first through hole 13 , and the oil outlet 212 is communicated with the second through hole 14 .

[0030] Utilizing the technical solution of this embodiment, a cartridge valve 20 is provided on the cylinder body 10 of the lifting cylinder. When the piston rod 50 is retracted, the elastic force provided by the elastic reset member 23 is greater than the pressure at the first through hole 13, so that the valve core 22 is in a closed position. At this time, the cartridge valve 20 isolates the rod chamber 11 and the rodless chamber 12 of the cylinder body 10, thereby maintaining the pressure of the lifting cylinder. When the piston rod 50 is extended, the pressure at the first through hole 13 is greater than the elastic force of the elastic reset member 23, so that the valve core 22 is in a connected position. At this time, the pressure generated by the high-speed impact causes a part of the hydraulic oil to flow back from the rod chamber 11 to the rodless chamber 12 through the cartridge valve 20, thereby playing a buffering role. In the above structure, the lifting cylinder can take into account both pressure maintenance and buffering performance, which solves the defect that the lifting cylinder in the prior art cannot meet the buffering requirements.

[0031] First of all, it should be noted that the lifting cylinder in this embodiment is relatively long (8.5 meters long and 370 mm in diameter), so Figure 1 and Figure 4 The middle section of the lift cylinder is shown in broken lines.

[0032] like Figure 2As shown, the valve core 22 is movably arranged in the valve body 21. The valve core 22 has a blocking position and a connecting position. The blocking position means that the valve core 22 blocks the oil inlet 211 and the oil outlet 212, and the hydraulic oil cannot pass through the valve body 21. The connecting position means that the valve core 22 opens and connects the oil inlet 211 and the oil outlet 212. At this time, the hydraulic oil can flow from the oil inlet 211 to the oil outlet 212.

[0033] Combination Figures 1 to 4 The content shown, combined with Figure 2 The direction shown introduces the working process of the lifting cylinder.

[0034] When the piston rod 50 of the lifting cylinder is retracted, the rammer is lifted accordingly. At this time, the pressure applied by the rod chamber 11 to the valve core 22 at the first through hole 13 is less than the elastic force applied by the elastic reset member 23 to the valve core 22. Therefore, the valve core 22 is pushed downward by the elastic reset member 23 to close the oil inlet 211, that is, it is in a blocked position. At this time, the hydraulic oil cannot pass through the cartridge valve 20, that is, the cartridge valve 20 isolates the rod chamber 11 and the rodless chamber 12 of the cylinder body 10 to achieve the effect of maintaining pressure.

[0035] When the piston rod 50 of the lifting cylinder is extended, the corresponding process is the free fall of the rammer. In this embodiment, the working pressure of the lifting cylinder is relatively large (working pressure 40Mpa, impact pressure 50Mpa), and a relatively large pressure will be generated in the rod chamber 11. At this time, the pressure applied by the rod chamber 11 to the valve core 22 at the first through hole 13 is greater than the elastic force applied by the elastic reset member 23 to the valve core 22. Therefore, the valve core 22 is pushed upward by the pressure, so that the oil inlet 211 and the oil outlet 212 of the valve body 21 are connected. At this time, the hydraulic oil in the rod chamber 11 can flow back to the rodless chamber 12 through the path of "first through hole 13-oil inlet 211-oil outlet 212-second through hole 14", thereby having the effect of buffering the working pressure.

[0036] Optionally, the cartridge valve 20 is provided with a buffer structure. The buffer structure may be a flow limiting hole or a buffer groove or the like provided on the valve body 21. Through the buffer structure, when the rammer falls, the impact on the cylinder body 10 can be reduced, and the service life of the lifting cylinder can be increased.

[0037] like Figure 1 and Figure 2As shown, in the technical solution of this embodiment, the cartridge valve 20 further includes a valve seat 24. The valve seat 24 is arranged at the end of the cylinder body 10 facing the rod chamber 11, and a mounting chamber 25 is arranged in the valve seat 24. The valve seat 24 is provided with a third through hole 241 and a fourth through hole 242. The valve core 22 is arranged in the mounting chamber 25, and the oil inlet 211 is connected to the third through hole 241, and the oil outlet 212 is connected to the fourth through hole 242. Further, the third through hole 241 is connected to the first through hole 13, and the fourth through hole 242 is connected to the second through hole 14.

[0038] from Figure 1 It can be seen that the valve seat 24 is arranged at the end position of the cylinder body 10, and the valve seat 24 can be connected to the cylinder body 10 by fasteners such as bolts. During assembly, the third through hole 241 of the valve seat 24 is aligned with the first through hole 13 and communicated.

[0039] Further, after assembling the valve seat 24, the valve body 21 and the valve core 22 can be assembled in the valve seat 24. During assembly, the oil inlet 211 on the valve body 21 needs to be aligned and connected with the third through hole 241 on the valve seat 24, and the oil outlet 212 on the valve body 21 needs to be aligned and connected with the fourth through hole 242 on the valve seat 24.

[0040] like Figures 1 to 4 As shown, in the technical solution of this embodiment, the lifting cylinder also includes a tube body 30, one end of the tube body 30 is connected to the valve seat 24 and communicates with the fourth through hole 242, and the other end of the tube body 30 is connected to the cylinder body 10 and communicates with the second through hole 14.

[0041] Specifically, the fourth through hole 242 is connected to the second through hole 14 through the tube body 30 , so that the hydraulic oil can flow back from the cartridge valve 20 to the rodless chamber 12 .

[0042] Furthermore, the extension direction of the tube body 30 is the same as the extension direction of the cylinder body 10. Figure 3 As shown, a connection block is provided at the end of the cylinder body 10 facing the rodless chamber 12. An inverted "L"-shaped flow channel is provided in the connection block, one end of the flow channel is connected to the second through hole 14, and the end of the tube body 30 is connected to the other end of the flow channel. The connection block can be connected to the cylinder body 10 by fasteners such as bolts, and facilitates the assembly of the tube body 30.

[0043] Therefore, when the rammer falls, the hydraulic oil return path in the cylinder body 10 is "first through hole 13-third through hole 241-oil inlet 211-oil outlet 212-fourth through hole 242-tube body 30-flow channel in the connecting block-second through hole 14".

[0044] Furthermore, the pipe body 30, the fourth through hole 242 and the connecting block are all assembled by sealing rings. Therefore, the pipe body 30 is not connected by welding, and fatigue will not occur between the pipe body 30, the valve seat 24 and the connecting block under the condition of frequent high-pressure impact of the rammer, affecting the service life.

[0045] like Figure 1 and 4 As shown, in the technical solution of this embodiment, the lifting cylinder further includes a support frame 40 , which is disposed on the cylinder body 10 and is suitable for supporting the pipe body 30 .

[0046] Specifically, since the tube body 30 is relatively long, a support frame 40 is required for support. Figure 1 and Figure 4 As shown, the support frame 40 may include a clamp and a support arm. The clamp is sleeved outside the cylinder body 10 , and the support arm is connected to the pipe body 30 to support the pipe body 30 .

[0047] Optionally, a plurality of support frames 40 may be provided, and the plurality of support frames 40 are arranged at intervals along the axial direction of the tube body 30 .

[0048] like Figure 2 As shown, in the technical solution of this embodiment, the cartridge valve 20 also includes a valve cover 26, which is covered on the valve seat 24 and closes the installation cavity 25. The valve body 21 is a cylindrical structure with openings at both ends, and the two ends of the elastic reset member 23 are respectively abutted against the valve core 22 and the valve cover 26.

[0049] Specifically, the valve seat 24 generally includes a bottom wall and a side wall, and the bottom wall and the side wall enclose the above-mentioned installation cavity 25. The third through hole 241 is provided on the bottom wall, and the fourth through hole 242 is provided on the side wall. When the valve body 21 is installed in the installation cavity 25, the valve cover 26 is covered on the valve seat 24, and the valve body 21 is fixed in the installation cavity 25.

[0050] Optionally, the valve cover 26 may be connected to the valve seat 24 by fasteners such as bolts.

[0051] like Figure 2 As shown, in the technical solution of this embodiment, the valve body 21 is a cylindrical structure with openings at both ends. One end of the valve body 21 is opened to form an oil inlet 211 , and the oil outlet 212 is arranged on the side wall of the valve body 21 .

[0052] Specifically, when the valve body 21 is assembled, the axis of the valve body 21 is assembled along the radial direction of the cylinder body 10. Figure 2 As illustrated in the direction shown, the lower opening of the valve body 21 forms an oil inlet. After the valve body 21 is placed vertically in the installation cavity 25, the lower opening of the valve body 21 is coaxial with and connected to the third through hole 241 and the first through hole 13, and the oil outlet 212 on the side wall of the valve body 21 is connected to the fourth through hole 242.

[0053] After the valve body 21 is assembled, the valve core 22 is assembled in the valve body 21 , and then the elastic return member is assembled at the upper end of the valve core 22 , and finally the valve cover 26 is covered on the valve seat 24 and connected by fasteners.

[0054] like Figure 5 As shown, in the technical solution of this embodiment, a plurality of installation cavities 25 are arranged in the valve seat 24, a plurality of third through holes 241 and a plurality of fourth through holes 242 are arranged on the valve seat 24, and the plurality of third through holes 241 and the plurality of fourth through holes 242 are connected to the plurality of installation cavities 25 in a one-to-one correspondence.

[0055] Specifically, in this embodiment, two installation cavities 25 are provided in one valve seat 24, and each installation cavity 25 can be provided with a valve body 21. Two third through holes 241 are provided on the bottom wall of the valve seat 24, and are respectively connected with the two installation cavities 25. Two fourth through holes are provided on the side wall of the valve seat 24, and are respectively connected with the two installation cavities 25. Two first through holes 13 are provided on the cylinder body 10. When the valve seat 24 is assembled on the cylinder body 10, the two first through holes 13 are respectively connected with the two third through holes 241.

[0056] Since the flow rates of the oil inlet 211 and the oil outlet 212 of a single valve body 21 are limited, by arranging a plurality of valve bodies 21 in the valve seat 24 , the return path of the hydraulic oil can be increased, thereby ensuring the buffering effect.

[0057] like Figure 5 As shown, in the technical solution of this embodiment, there are multiple valve seats 24, and the multiple valve seats 24 are arranged circumferentially on the cylinder body 10. Specifically, in this embodiment, there are three valve seats 24, and two valve bodies 21 are arranged in each valve seat 24, that is, there are six return paths for the hydraulic oil.

[0058] Of course, those skilled in the art may select the number of valve seats 24 and the number of valve bodies 21 disposed in each valve seat 24 according to actual conditions.

[0059] The present application also provides an engineering machinery, which includes a rammer and a lifting cylinder connected to the rammer, and the lifting cylinder is the above-mentioned lifting cylinder.

[0060] Optionally, the construction machinery may be a crawler crane with a rammer, a dynamic rammer, or the like.

[0061] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A lifting cylinder, characterized in that: include: A cylinder body (10) and a piston rod (50) movably arranged in the cylinder body (10), wherein the piston rod (50) divides the space in the cylinder body (10) into a rod chamber (11) and a rodless chamber (12), and a first through hole (13) and a second through hole (14) are arranged on the cylinder body (10), wherein the first through hole (13) is connected to the rod chamber (11), and the second through hole (14) is connected to the rodless chamber (12); A cartridge valve (20) is arranged on the cylinder body (10), the cartridge valve (20) comprising a valve body (21) and a valve core (22) movably arranged in the valve body (21), the valve body (21) being provided with an oil inlet (211) and an oil outlet (212), the first end of the valve core (22) being suitable for cooperating with the oil inlet (211), an elastic reset member (23) being arranged between the second end of the valve core (22) and the valve body (21), the valve core (22) having a blocking position for closing the oil inlet (211), and a communicating position for opening the oil inlet (211) so that the oil inlet (211) is communicated with the oil outlet (212), The oil inlet (211) is in communication with the first through hole (13), and the oil outlet (212) is in communication with the second through hole (14).

2. The lifting cylinder according to claim 1, characterized in that: The cartridge valve (20) is provided with a buffer structure.

3. The lifting cylinder according to claim 1 or 2, characterized in that: The cartridge valve (20) also includes a valve seat (24), the valve seat (24) is arranged at the end of the cylinder body (10) facing the rod chamber (11), an installation chamber (25) is arranged in the valve seat (24), a third through hole (241) and a fourth through hole (242) are arranged on the valve seat (24), the valve core (22) is arranged in the installation chamber (25), and the oil inlet (211) is connected to the third through hole (241), the oil outlet (212) is connected to the fourth through hole (242), the third through hole (241) is connected to the first through hole (13), and the fourth through hole (242) is connected to the second through hole (14).

4. The lifting cylinder according to claim 3, characterized in that: The lifting cylinder also includes a pipe body (30), one end of which is connected to the valve seat (24) and communicates with the fourth through hole (242), and the other end of which is connected to the cylinder body (10) and communicates with the second through hole (14).

5. The lifting cylinder according to claim 4, characterized in that: The lifting cylinder further comprises a support frame (40), wherein the support frame (40) is arranged on the cylinder body (10) and is suitable for supporting the pipe body (30).

6. The lifting cylinder according to claim 3, characterized in that: The cartridge valve (20) further comprises a valve cover (26), wherein the valve cover (26) is disposed on the valve seat (24) and closes the installation cavity (25); the valve body (21) is a cylindrical structure with openings at both ends; and the two ends of the elastic return member (23) are respectively in contact with the valve core (22) and the valve cover (26).

7. The lifting cylinder according to claim 3, characterized in that: The valve body (21) is a cylindrical structure with openings at both ends. One end of the valve body (21) is open to form the oil inlet (211). The oil outlet (212) is arranged on the side wall of the valve body (21). The third through hole (241) is arranged on the bottom wall of the valve seat (24). The fourth through hole (242) is arranged on the side wall of the valve seat (24).

8. The lifting cylinder according to claim 3, characterized in that: A plurality of the installation cavities (25) are arranged in the valve seat (24), and a plurality of the third through holes (241) and a plurality of the fourth through holes (242) are arranged on the valve seat (24). The plurality of the third through holes (241) and the plurality of the fourth through holes (242) are connected to the plurality of the installation cavities (25) in a one-to-one correspondence.

9. The lifting cylinder according to claim 3, characterized in that: There are a plurality of valve seats (24), and the plurality of valve seats (24) are arranged on the cylinder body (10) along the circumferential direction.

10. An engineering machine, characterized in that: It comprises a rammer and a lifting cylinder connected to the rammer, and the lifting cylinder is the lifting cylinder according to any one of claims 1 to 9.

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