阅读说明：本技术 一种内部实现顺序阀功能的伸缩油缸 (Telescopic oil cylinder with function of sequence valve inside ) 是由 雷俊 罗金盛 杨永明 杨继 金映呈 于 2019-10-23 设计创作，主要内容包括：本发明提出了一种内部实现顺序阀功能的伸缩油缸,包括至少两级油缸连接,每级油缸的有杆腔连接油孔连接至下一级油缸的有杆腔油孔,每级油缸的无杆腔连接油孔连接至下一级油缸的无杆腔油孔；第一级油缸的有杆腔油孔和无杆腔油孔分别连通油压系统的回油端和出油端,最后一级油缸的有杆腔连接油孔和无杆腔连接油孔密封。本发明配合单向阀实现多级油缸的顺序伸出,通过油缸自身回缩力面积比,实现多个伸缩油缸顺序缩回；抛弃传统的外置安装式顺序阀,伸缩油缸通过内部结构控制油路,实现油缸的顺序伸缩功能,着力解决串联伸缩油缸顺序伸缩的稳定性和可靠性。(The invention provides a telescopic oil cylinder internally realizing a sequence valve function, which comprises at least two stages of oil cylinder connections, wherein a rod cavity connecting oil hole of each stage of oil cylinder is connected to a rod cavity oil hole of a next stage of oil cylinder, and a rodless cavity connecting oil hole of each stage of oil cylinder is connected to a rodless cavity oil hole of the next stage of oil cylinder; the rod cavity oil hole and the rodless cavity oil hole of the first-stage oil cylinder are respectively communicated with the oil return end and the oil outlet end of the oil pressure system, and the rod cavity connecting oil hole and the rodless cavity connecting oil hole of the last-stage oil cylinder are sealed. The invention realizes the sequential extension of the multi-stage oil cylinders by matching with the one-way valves, and realizes the sequential retraction of a plurality of telescopic oil cylinders by the area ratio of the retraction force of the oil cylinders; abandon traditional external installation formula sequence valve, flexible hydro-cylinder passes through inner structure control oil circuit, realizes the flexible function of order of hydro-cylinder, puts the effort to solve the flexible stability and the reliability of series connection flexible hydro-cylinder order.)

1. A telescopic oil cylinder with an internal sequence valve function comprises at least two stages of oil cylinder connections, and is characterized in that the oil cylinder comprises a cylinder body (1), one end of a piston rod (5) extends into the cylinder body (1), the end part of the piston rod is provided with a piston (7), the other end of the piston rod is positioned outside the cylinder body (1), the end part of the piston rod is provided with a piston rod assembly block (6), and two sides of the piston (7) are respectively provided with a rod cavity oil hole (2) and a rodless cavity oil hole (3) which are communicated to a rod cavity (101) and a rodless cavity (102) of the oil cylinder; the piston rod assembly block (6) is respectively provided with a rod cavity connecting oil hole (10) and a rodless cavity connecting oil hole (11), the piston rod (5) is hollow with two sealed ends, one end of a hollow part (103) of the piston rod (5) is communicated to a rodless cavity (102) of the cylinder body (1), the other end of the hollow part is communicated to the rod cavity connecting oil hole (10), and the rodless cavity connecting oil hole (11) is communicated to a rodless cavity (102) of the cylinder body (1) through a pipeline arranged in the piston rod (5); the outer side wall of the piston (4) is sleeved on the inner wall of the cylinder body (1) in a matching mode, a first oil hole (7) is formed in the outer side wall of the piston (4), one end of the first oil hole (7) is located at the position where the cylinder body (1) is matched with the piston (4), and the other end of the first oil hole is communicated to a hollow portion (103) in the piston rod (5); a second oil hole (8) is further formed in the piston (4), one end of the second oil hole (8) is communicated to a rod cavity (101) of the cylinder body, and the other end of the second oil hole is communicated to a hollow portion (103) in the piston rod (5); the second oil hole (8) is provided with a one-way valve (9) which can only flow from the rod cavity (101) to the hollow part (103) in the piston rod;

a rod cavity connecting oil hole (10) of each stage of oil cylinder is connected to a rod cavity oil hole (2) of the next stage of oil cylinder, and a rodless cavity connecting oil hole (11) of each stage of oil cylinder is connected to a rodless cavity oil hole (3) of the next stage of oil cylinder; the rod cavity oil hole (2) and the rodless cavity oil hole (3) of the first-stage oil cylinder are respectively communicated with the oil return end and the oil outlet end of the oil pressure system, and the rod cavity connecting oil hole (10) and the rodless cavity connecting oil hole (11) of the last-stage oil cylinder are sealed.

2. A telescopic cylinder internally performing a sequence valve function according to claim 1, wherein an OK packing (12) is provided on the piston (4) between the second oil hole (8) and the first oil hole (7), and the second oil hole (8) is located at a side close to the rod chamber (101) and the first oil hole (7) is located at a side close to the rodless chamber (102).

3. A telescopic cylinder internally performing a sequence valve function according to claim 1, wherein the rod chamber oil hole (2) is formed at an end of the cylinder body 1 remote from the rodless chamber (102), and the rodless chamber oil hole (3) is formed at an end of the cylinder body 1 remote from the rod chamber (101).

4. A telescopic cylinder internally realizing a sequence valve function according to claim 1, wherein the sectional area of the rodless chamber (102) of the cylinder is increased in steps from the one-stage cylinder to the multi-stage cylinder.

Technical Field

The invention relates to a telescopic oil cylinder internally realizing the function of a sequence valve.

Background

The telescopic oil cylinder is used as a core working element for the extension of the truck-mounted crane boom frame, plays a key role in the hoisting loading and unloading, and is particularly important in stability and reliability. The traditional telescopic cylinder is characterized in that an external sequence valve is additionally arranged between oil inlet and oil return of each stage of oil cylinder to realize the functions, and the traditional telescopic cylinder has the defects that the sequence valve needs to be subjected to pressure debugging in each assembling process, if the pressure debugging is not accurate enough, the sequence can be disordered, the sequence valve has to be removed and readjusted, and the traditional telescopic cylinder is labor-consuming and time-consuming; the external sequence valve is connected by using a joint, so that the risk of oil leakage is caused; external sequence valves can also cause the system to back pressure high, resulting in system noise and pressure fluctuations.

Disclosure of Invention

The invention provides a telescopic oil cylinder internally realizing the function of a sequence valve, which has ingenious design conception of an internal structure and an oil way, fully utilizes the principle of an oil cylinder series loop, and realizes the function of sequentially extending the oil cylinder by selecting a one-way valve to limit the oil way; and the sequential retraction of the plurality of telescopic oil cylinders is realized through the area ratio of the retraction force of the oil cylinders.

The technical scheme of the invention is realized as follows:

a telescopic oil cylinder with the interior realizing the function of a sequence valve comprises at least two stages of oil cylinder connections, wherein the oil cylinder comprises a cylinder body 1, one end of a piston rod 5 extends into the cylinder body 1, the end part of the piston rod is provided with a piston 7, the other end of the piston rod is positioned outside the cylinder body 1, the end part of the piston rod is provided with a piston rod assembly block 6, and a rod cavity oil hole 2 and a rodless cavity oil hole 3 which are communicated to a rod cavity 101 and a rodless cavity 102 of the oil cylinder are respectively arranged at two sides of; the piston rod assembly block 6 is respectively provided with a rod cavity connecting oil hole 10 and a rodless cavity connecting oil hole 11, the piston rod 5 is of an internal hollow shape with two sealed ends, one end of a hollow part 103 of the piston rod 5 is communicated to a rodless cavity 102 of the cylinder body 1, the other end of the hollow part is communicated to the rod cavity connecting oil hole 10, and the rodless cavity connecting oil hole 11 is communicated to the rodless cavity 102 of the cylinder body 1 through a pipeline arranged in the piston rod 5; the outer side wall of the piston 4 is sleeved on the inner wall of the cylinder body 1 in a matching manner, the outer side wall of the piston 4 is provided with a first oil hole 7, one end of the first oil hole 7 is positioned at the position where the cylinder body 1 and the piston 4 are matched, and the other end of the first oil hole is communicated to a hollow part 103 in the piston rod 5; the piston 4 is also provided with a second oil hole 8, one end of the second oil hole 8 is communicated to a rod cavity 101 of the cylinder body, and the other end of the second oil hole 8 is communicated to a hollow part 103 in the piston rod 5; the second oil hole 8 is provided with a check valve 9 which can only flow from the rod cavity 101 to the hollow part 103 in the piston rod;

a rod cavity connecting oil hole 10 of each stage of oil cylinder is connected to a rod cavity oil hole 2 of the next stage of oil cylinder, and a rodless cavity connecting oil hole 11 of each stage of oil cylinder is connected to a rodless cavity oil hole 3 of the next stage of oil cylinder; the rod cavity oil hole 2 and the rodless cavity oil hole 3 of the first-stage oil cylinder are respectively communicated with an oil return end and an oil outlet end of the oil pressure system, and the rod cavity connecting oil hole 10 and the rodless cavity connecting oil hole 11 of the last-stage oil cylinder are sealed.

Preferably, an OK seal ring 12 is arranged on the piston 4 between the second oil hole 8 and the first oil hole 7, the second oil hole 8 is positioned on the side close to the rod chamber 101, and the first oil hole 7 is positioned on the side close to the rodless chamber 102.

Preferably, the rod chamber oil hole 2 is located at one end of the cylinder block 1 far from the rod chamber 102, and the rod chamber oil hole 3 is located at one end of the cylinder block 1 far from the rod chamber 101.

Preferably, the section area of the rodless chamber 102 of the cylinder increases step by step from the one-stage cylinder to the multi-stage cylinder.

The invention has the following beneficial effects: the invention realizes the sequential extension of the multi-stage oil cylinders by matching with the one-way valves, and realizes the sequential retraction of a plurality of telescopic oil cylinders by the area ratio of the retraction force of the oil cylinders; abandon traditional external installation formula sequence valve, flexible hydro-cylinder passes through inner structure control oil circuit, realizes the flexible function of order of hydro-cylinder, puts the effort to solve the flexible stability and the reliability of series connection flexible hydro-cylinder order. The telescopic oil cylinder can perfectly realize sequential telescopic, the installation and debugging are carried out on a Dude lifting SQ330 folding arm crane, the lifting test is free from abnormity, the reciprocating telescopic test is free from clamping stagnation and disorder phenomena, an external sequence valve is omitted, the after-sale service rate is reduced by 5%, and the total assembly debugging efficiency is improved by 10%.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a three-stage cylinder connection according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a single-stage oil cylinder of the present invention.

Fig. 3 is a partially enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic diagram of the cylinder extending to the maximum stroke.

Fig. 5 is a partially enlarged view of fig. 4 at B.

Fig. 6 is a schematic diagram of the cylinder retracting to a minimum stroke.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-5, the telescopic oil cylinder with an internal sequence valve function comprises at least two stages of oil cylinder connections, the oil cylinder comprises a cylinder body 1, one end of a piston rod 5 extends into the cylinder body 1 and the end part is provided with a piston 7, the other end is positioned outside the cylinder body 1 and the end part is provided with a piston rod assembly block 6, and a rod cavity oil hole 2 and a rodless cavity oil hole 3 which are communicated to a rod cavity 101 and a rodless cavity 102 of the oil cylinder are respectively arranged at two sides of the piston 7; the piston rod assembly block 6 is respectively provided with a rod cavity connecting oil hole 10 and a rodless cavity connecting oil hole 11, the piston rod 5 is of an internal hollow shape with two sealed ends, one end of a hollow part 103 of the piston rod 5 is communicated to a rodless cavity 102 of the cylinder body 1, the other end of the hollow part is communicated to the rod cavity connecting oil hole 10, and the rodless cavity connecting oil hole 11 is communicated to the rodless cavity 102 of the cylinder body 1 through a pipeline arranged in the piston rod 5; the outer side wall of the piston 4 is sleeved on the inner wall of the cylinder body 1 in a matching manner, the outer side wall of the piston 4 is provided with a first oil hole 7, one end of the first oil hole 7 is positioned at the position where the cylinder body 1 and the piston 4 are matched, and the other end of the first oil hole is communicated to a hollow part 103 in the piston rod 5; the piston 4 is also provided with a second oil hole 8, one end of the second oil hole 8 is communicated to a rod cavity 101 of the cylinder body, and the other end of the second oil hole 8 is communicated to a hollow part 103 in the piston rod 5; the second oil hole 8 is provided with a check valve 9 which can only flow from the rod cavity 101 to the hollow part 103 in the piston rod; the rod cavity oil hole 2 is positioned at one end of the cylinder body 1 far away from the rodless cavity 102, and the rodless cavity oil hole 3 is positioned at one end of the cylinder body 1 far away from the rod cavity 101.

A rod cavity connecting oil hole 10 of each stage of oil cylinder is connected to a rod cavity oil hole 2 of the next stage of oil cylinder, and a rodless cavity connecting oil hole 11 of each stage of oil cylinder is connected to a rodless cavity oil hole 3 of the next stage of oil cylinder; the rod cavity oil hole 2 and the rodless cavity oil hole 3 of the first-stage oil cylinder are respectively communicated with an oil return end and an oil outlet end of the oil pressure system, and the rod cavity connecting oil hole 10 and the rodless cavity connecting oil hole 11 of the last-stage oil cylinder are sealed. An OK sealing ring 12 is arranged on the piston 4 between the second oil hole 8 and the first oil hole 7, the second oil hole 8 is positioned on one side close to the rod cavity 101, and the first oil hole 7 is positioned on one side close to the rodless cavity 102. The oil return of the telescopic oil cylinder with the traditional structure only needs to return oil from a corresponding piston rod, because the limit of the built-in one-way valve is increased, an oil return channel must be added at the position of the piston, and two-way sealing must be added between the oil return channel and the one-way valve, otherwise, the oil return control fails; considering that the sealing ring needs to pass through the oil passing hole, the sealing ring which is friction-resistant and made of special material must be selected, and the OK sealing ring 12 is selected as the bidirectional sealing by taking the piston sealing ring of the double-acting sleeve cylinder as reference.

The invention takes a three-stage oil cylinder as an example, and the working principle is as follows:

the rodless cavity oil hole 3 and the rod cavity oil hole 2 of the primary oil cylinder 100 are connected with an oil inlet and an oil return oil way of an external oil pressure system, and the secondary oil cylinder 200 is respectively communicated with the rodless cavity oil hole 3 and the rod cavity oil hole 2 of the secondary oil cylinder 200 through the rod cavity connecting oil hole 10 and the rodless cavity connecting oil hole 11 of the primary oil cylinder 100; similarly, the third-stage oil cylinder 300 is respectively communicated with the rodless cavity oil hole 3 and the rodless cavity oil hole 2 of the third-stage oil cylinder 300 through the rod cavity connecting oil hole 10 and the rodless cavity connecting oil hole 11 of the second-stage oil cylinder 200.

When the system is extended, oil is fed from the outside of the system, and an oil path can enter the rodless cavity connecting oil hole 11 through an oil pipe channel inside the piston rod 5 of the primary oil cylinder 100 and then enter the rodless cavity 102 of each stage of cylinder. The oil in the rod cavity 101 of the first-stage oil cylinder 100 returns to the oil pressure system through the rod cavity oil hole 2, but the return oil in the rod cavity 101 of the second-stage oil cylinder 200 and the third-stage oil cylinder 300 can only return oil after entering the rod cavity 101 through the hollow part 103 of the piston rod of the last-stage oil cylinder, but a check valve 9 which can only flow from the rod cavity 101 to the hollow part 103 in the piston rod exists, the communication between the hollow part of the piston rod of the stage and the rod cavity can be locked by the check valve 9, so that the rod cavity and the rodless cavity of the second-stage oil cylinder and the third-stage oil cylinder cannot return oil, and the piston rod cannot extend outwards, so that the first. During the expansion process, the first oil hole 7 of the piston 4 of the primary cylinder 100 is blocked by the cylinder body at the outlet and can not realize oil passing, so that the sealing state is equivalent.

When the primary oil cylinder 100 reaches the stroke end, the first oil hole 7 of the piston 4 of the primary oil cylinder 100 is aligned with the rod cavity oil hole 2 and communicated with each other, and at the moment, the oil return channel of the secondary oil cylinder 200 is communicated with the oil pressure system, namely, the rod cavity of the secondary oil cylinder 200 is communicated with the hollow part of the piston of the primary oil cylinder 100, so that the hollow part of the piston of the primary oil cylinder 100 is directly communicated to the oil return end of the oil pressure system, the rod cavity of the secondary oil cylinder 200 can smoothly discharge oil, and the piston rod of the secondary oil cylinder 200 can normally extend out; in the same way, when the secondary oil cylinder 200 extends to the stroke end, the oil discharge channel of the tertiary oil cylinder 300 is communicated and then can normally extend; therefore, the stretching out in the order of one, two and three stages can be realized.

When retracting, the rodless cavities 102 of the first, second and third oil cylinders can return oil, so that the retracting sequence at the moment depends on the stress area of the rodless cavities, namely the area of the rod cavity of the single-stage oil cylinder, and the sequential retracting from three stages to one stage can be realized only when the area of the rodless cavities of the first-stage to third-stage oil cylinders is increased step by step during the design of the oil cylinders; in general, when the truck mounted crane retracts, no special requirements are required on the retraction sequence of the telescopic arm, so that the retraction area of the oil cylinder is only used as a reference.

By analogy, the multistage oil cylinders can be connected and gradually extended out, and the multistage oil cylinders can be retracted in sequence, and the number of stages of the oil cylinders can be specifically designed according to actual conditions without description.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.