Piston type hydraulic oil cylinder protection system and hydraulic transmission system

Abstract

The utility model discloses a protection system of a piston type hydraulic oil cylinder and a hydraulic transmission system, and relates to the technical field of hydraulic transmission. Comprising an oil inlet main oil way, an oil return main oil way, a plug cavity main oil way, a rod cavity main oil way, a hydraulic control oil way, a three-position four-way proportional directional valve, a two-position four-way electromagnetic valve, a first hydraulic control one-way valve, a second hydraulic control one-way valve, a third hydraulic control one-way valve and a one-way valve. An oil outlet of the one-way valve is communicated with the rod cavity main oil way; the piston type hydraulic oil cylinder can be effectively protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic transmission technical field, in particular to a kind of protection system and hydraulic transmission system of piston type hydraulic cylinder. BACKGROUND

[0002] Hydraulic cylinder is the execution element in hydraulic transmission system, it is the energy conversion device that hydraulic energy is converted into mechanical energy.Hydraulic cylinder realizes reciprocating motion.Piston type hydraulic cylinder is a common hydraulic cylinder, when hydraulic cylinder is subjected to huge external force, piston rod retracts, at this time, rod cavity is not easy to cause "suction emptying" phenomenon due to no hydraulic oil continuously enters, damage hydraulic cylinder, and piston rod will pop out when external force is cancelled, further damage hydraulic cylinder. CONTENT OF UTILITY MODEL

[0003] The utility model aims at providing a kind of protection system and hydraulic transmission system of piston type hydraulic cylinder to solve the problems existing in the prior art, can effectively protect piston type hydraulic cylinder.

[0004] To achieve the above object, the utility model provides the following scheme:

[0005] The utility model provides a piston type hydraulic cylinder's protection system, including oil inlet main oil circuit, oil return main oil circuit, plug cavity main oil circuit, rod cavity main oil circuit, hydraulic control oil circuit, three position four way proportional reversing valve, two position four way electromagnetic valve, first hydraulic control check valve, second hydraulic control check valve, third hydraulic control check valve and check valve, have first branch oil inlet and second branch oil inlet on the oil inlet main oil circuit, have first branch oil return and second branch oil return on the oil return main oil circuit, the first end of plug cavity main oil circuit is connected with piston type hydraulic cylinder's plug cavity, the first end of rod cavity main oil circuit is connected with piston type hydraulic cylinder's rod cavity, the oil inlet of two position four way electromagnetic valve is connected with first branch oil inlet, the oil return of two position four way electromagnetic valve is connected with first branch oil return, the second working port of two position four way electromagnetic valve is connected with hydraulic control oil circuit, the oil inlet of three position four way proportional reversing valve is connected with the positive direction oil inlet of first hydraulic control check valve, the oil return of three position four way proportional reversing valve is connected with second branch oil return, the first working port of three position four way proportional reversing valve is connected with the positive direction oil inlet of second hydraulic control check valve, the second working port of three position four way proportional reversing valve is connected with the positive direction oil inlet of third hydraulic control check valve, the hydraulic control port of first hydraulic control check valve, second hydraulic control check valve and third hydraulic control check valve is connected with hydraulic control oil circuit, the positive direction oil outlet of first hydraulic control check valve is connected with second branch oil inlet, the positive direction oil outlet of second hydraulic control check valve is connected with the second end of plug cavity main oil circuit, the positive direction oil outlet of third hydraulic control check valve is connected with the second end of rod cavity main oil circuit, the oil inlet of check valve is connected with second branch oil return, the oil outlet of check valve is connected with rod cavity main oil circuit.

[0006] Preferably, the plug cavity main oil circuit is provided with a secondary pressure balance valve.

[0007] Preferably, the plug cavity main oil circuit is provided with a first ball valve.

[0008] Preferably, the rod cavity main oil circuit is provided with a second ball valve.

[0009] Preferably, the oil inlet main oil circuit is provided with a first pressure measuring connector.

[0010] Preferably, the first pressure measuring connector is connected to and communicates with one end of a pressure measuring hose, and the other end of the pressure measuring hose is provided with a pressure gauge.

[0011] Preferably, the plug cavity main oil circuit is provided with a second pressure measuring connector.

[0012] Preferably, the rod cavity main oil circuit is provided with a third pressure measuring connector.

[0013] Preferably, the hydraulic control oil circuit is provided with a fourth pressure measuring connector.

[0014] The utility model also provides a kind of hydraulic transmission system, including piston type hydraulic cylinder and the protection system of piston type hydraulic cylinder as described above.

[0015] The utility model relative to prior art obtains following technical effect:

[0016] The protection system of piston type hydraulic cylinder and hydraulic transmission system provided by the utility model, after oil inlet main oil way oil inlet, two-position four-way electromagnetic valve is electrified, the oil inlet of two-position four-way electromagnetic valve is communicated with the second working port of two-position four-way electromagnetic valve, first branch oil inlet way passes through two-position four-way electromagnetic valve and supplies oil to hydraulic control oil way, controls first hydraulic control check valve, second hydraulic control check valve and third hydraulic control check valve positive and negative bidirectional communication, first branch oil inlet way flows into the oil inlet of three-position four-way proportional reversing valve after first hydraulic control check valve, when the oil inlet of three-position four-way proportional reversing valve is communicated with the first working port of three-position four-way proportional reversing valve, hydraulic oil second hydraulic control check valve enters plug cavity main oil way, finally enters the plug cavity of piston type hydraulic cylinder, and piston rod pushes out;When the oil inlet of three-position four-way proportional reversing valve is communicated with the second working port of three-position four-way proportional reversing valve, hydraulic oil passes through third hydraulic control check valve and enters rod cavity main oil way, finally enters the rod cavity of piston type hydraulic cylinder;When oil inlet main oil way stops oil supply, first hydraulic control check valve, second hydraulic control check valve and third hydraulic control check valve are reversed and closed, when piston rod is retracted under the action of great external force, rod cavity is communicated with oil return main oil way by check valve, can be opened when "sucking empty" phenomenon occurs, so that the hydraulic oil in oil tank is sucked into rod cavity, timely oil supplement, and prevent piston rod from ejecting when external force is removed, to protect hydraulic cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiments will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0018] Figure 1 It is the schematic diagram of the protection system of piston type hydraulic cylinder provided by the utility model;

[0019] In the figure: 1 - main oil inlet, 2 - main oil return, 3 - main oil chamber, 4 - main oil rod chamber, 5 - pilot oil, 6 - three-position four-way proportional reversing valve, 7 - two-position four-way electromagnetic valve, 8 - first pilot check valve, 9 - second pilot check valve, 10 - third pilot check valve, 11 - check valve, 12 - first branch inlet, 13 - second branch inlet, 14 - first branch return, 15 - second branch return, 16 - with secondary pressure balance valve, 17 - first ball valve, 18 - second ball valve, 19 - first pressure measuring connector, 20 - pressure measuring hose, 21 - pressure gauge, 22 - second pressure measuring connector, 23 - third pressure measuring connector, 24 - fourth pressure measuring connector. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0021] The utility model discloses a kind of protection system and hydraulic transmission system of piston type hydraulic cylinder, to solve the problems existing in the prior art described above, piston type hydraulic cylinder can be effectively protected.

[0022] In order to make the above purposes, features and advantages of the utility model more obvious and easy to understand, the utility model is further described in detail below with reference to the drawings and specific embodiments.

[0023] Embodiment one

[0024] As Figure 1As shown, the embodiment provides a protection system for a piston hydraulic cylinder, which comprises an oil inlet main oil path 1, an oil return main oil path 2, a plug cavity main oil path 3, a rod cavity main oil path 4, a hydraulic control oil path 5, a three-position four-way proportional directional valve 6, a two-position four-way electromagnetic valve 7, a first hydraulic control check valve 8, a second hydraulic control check valve 9, a third hydraulic control check valve 10, and a check valve 11. The oil inlet main oil path 1 is provided with a first branch oil inlet path 12 and a second branch oil inlet path 13. The oil return main oil path 2 is provided with a first branch oil return path 14 and a second branch oil return path 15. The first end of the plug cavity main oil path 3 is in communication with the plug cavity of the piston hydraulic cylinder. The first end of the rod cavity main oil path 4 is in communication with the rod cavity of the piston hydraulic cylinder. The oil inlet port (P port) of the two-position four-way electromagnetic valve 7 is in communication with the first branch oil inlet path 12. The oil return port (T port) of the two-position four-way electromagnetic valve 7 is in communication with the first branch oil return path 14. The second working port (B port) of the two-position four-way electromagnetic valve 7 is in communication with the hydraulic control oil path 5. The oil inlet port (P port) of the three-position four-way proportional directional valve 6 is in communication with the forward oil inlet port of the first hydraulic control check valve 8. The oil return port (T port) of the three-position four-way proportional directional valve 6 is in communication with the second branch oil return path 15. The first working port (A port) of the three-position four-way proportional directional valve 6 is in communication with the forward oil inlet port of the second hydraulic control check valve 9. The second working port (B port) of the three-position four-way proportional directional valve 6 is in communication with the forward oil inlet port of the third hydraulic control check valve 10. The hydraulic control ports of the first hydraulic control check valve 8, the second hydraulic control check valve 9, and the third hydraulic control check valve 10 are in communication with the hydraulic control oil path 5. The forward oil outlet port of the first hydraulic control check valve 8 is in communication with the second branch oil inlet path 13. The forward oil outlet port of the second hydraulic control check valve 9 is in communication with the second end of the plug cavity main oil path 3. The forward oil outlet port of the third hydraulic control check valve 10 is in communication with the second end of the rod cavity main oil path 4. The oil inlet port of the check valve 11 is in communication with the second branch oil return path 15. The oil outlet port of the check valve 11 is in communication with the rod cavity main oil path 4.

[0025] The protection system of the piston hydraulic cylinder provided by the embodiment is as follows: after the main oil inlet 1 is filled with oil, the two-position four-way electromagnetic valve 7 is powered on, the oil inlet of the two-position four-way electromagnetic valve 7 is communicated with the second working port of the two-position four-way electromagnetic valve 7, the first branch oil inlet 12 passes through the two-position four-way electromagnetic valve 7 and supplies oil to the hydraulic control oil path 5, the first hydraulic control check valve 8, the second hydraulic control check valve 9 and the third hydraulic control check valve 10 are connected in a positive and negative direction, the first branch oil inlet 12 passes through the first hydraulic control check valve 8 and flows into the oil inlet of the three-position four-way proportional reversing valve 6, when the oil inlet of the three-position four-way proportional reversing valve 6 is communicated with the first working port of the three-position four-way proportional reversing valve 6, the hydraulic oil enters the plug cavity main oil path 3 through the second hydraulic control check valve 9, and finally enters the plug cavity of the piston hydraulic cylinder, and the piston rod is pushed out; when the oil inlet of the three-position four-way proportional reversing valve 6 is communicated with the second working port of the three-position four-way proportional reversing valve 6, the hydraulic oil enters the rod cavity main oil path 4 through the third hydraulic control check valve 10, and finally enters the rod cavity of the piston hydraulic cylinder; when the main oil inlet 1 stops supplying oil, the first hydraulic control check valve 8, the second hydraulic control check valve 9 and the third hydraulic control check valve 10 are reversely closed, when the piston rod is retracted under the action of a large external force, the rod cavity is communicated with the main oil return path 2 through the check valve 11, the check valve 11 is opened when the "emptying" phenomenon occurs, so that the hydraulic oil in the oil tank is sucked into the rod cavity, the oil is supplemented in time, and the piston rod is prevented from being ejected when the external force is removed, so that the piston hydraulic cylinder is protected.

[0026] Further, the hydraulic control outlets of the first hydraulic control check valve 8, the second hydraulic control check valve 9 and the third hydraulic control check valve 10 are communicated with the system oil discharge channel, so that the hydraulic oil in the first hydraulic control check valve 8, the second hydraulic control check valve 9 and the third hydraulic control check valve 10 can be discharged in time.

[0027] Further, the secondary pressure balance valve 16 is arranged on the plug chamber main oil path 3, after the oil inlet main oil path 1 is supplied with oil, the two-position four-way electromagnetic valve 7 is powered on, the oil inlet of the two-position four-way electromagnetic valve 7 is communicated with the second working port of the two-position four-way electromagnetic valve 7, the first branch oil inlet path 12 passes through the two-position four-way electromagnetic valve 7 and supplies oil to the hydraulic control oil path 5, controls the first hydraulic control check valve 8, the second hydraulic control check valve 9 and the third hydraulic control check valve 10 to be connected in positive and negative directions, the first branch oil inlet path 12 passes through the first hydraulic control check valve 8 and flows into the oil inlet of the three-position four-way proportional directional valve 6, when the oil inlet of the three-position four-way proportional directional valve 6 is communicated with the first working port of the three-position four-way proportional directional valve 6, the hydraulic oil enters the plug chamber main oil path 3 through the second hydraulic control check valve 9, and finally enters the plug chamber of the piston hydraulic oil cylinder, and the piston rod is pushed out; when the oil inlet of the three-position four-way proportional directional valve 6 is communicated with the second working port of the three-position four-way proportional directional valve 6, the hydraulic oil enters the rod chamber main oil path 4 through the third hydraulic control check valve 10, and finally enters the rod chamber of the piston hydraulic oil cylinder, the secondary pressure balance valve 16 is opened, the hydraulic oil in the plug chamber returns to the oil tank, and the secondary pressure balance valve 16 plays a pressure stabilizing role at this time; when the oil inlet main oil path 1 stops supplying oil, the first hydraulic control check valve 8, the second hydraulic control check valve 9 and the third hydraulic control check valve 10 are reversely closed, when the piston rod is retracted under the action of a large external force, the secondary pressure balance valve 16 plays a overflow role, the hydraulic oil in the plug chamber directly overflows through the secondary pressure balance valve 16, thereby playing a role of protecting the plug chamber.

[0028] Further, the first ball valve 17 is arranged on the plug chamber main oil path 3, so as to control the on-off of the plug chamber main oil path 3.

[0029] Further, the second ball valve 18 is arranged on the rod chamber main oil path 4, so as to control the on-off of the rod chamber main oil path 4.

[0030] Further, the first pressure measuring connector 19 is arranged on the oil inlet main oil path 1, so as to measure the oil pressure in the oil inlet main oil path 1.

[0031] Further, the first pressure measuring connector 19 is connected and communicated with one end of a pressure measuring hose 20, and a pressure gauge 21 is arranged on the other end of the pressure measuring hose 20, so that the structure is simple and the use is convenient.

[0032] Further, the second pressure measuring connector 22 is arranged on the plug chamber main oil path 3, so as to measure the oil pressure in the plug chamber main oil path 3.

[0033] Further, the third pressure measuring connector 23 is arranged on the rod chamber main oil path 4, so as to measure the oil pressure in the rod chamber main oil path 4.

[0034] Further, the fourth pressure measuring connector 24 is arranged on the hydraulic control oil path 5, so as to measure the oil pressure in the hydraulic control oil path 5.

[0035] Example two

[0036] The embodiment provides a hydraulic transmission system, comprising a piston type hydraulic cylinder and the protection system of the piston type hydraulic cylinder in the first embodiment.

[0037] The hydraulic transmission system provided by the embodiment is provided with the two-position four-way electromagnetic valve 7, the first branch oil inlet channel 12, the first hydraulic control check valve 8, the second hydraulic control check valve 9, the third hydraulic control check valve 10, the three-position four-way proportional reversing valve 6, the rod cavity main oil channel 4 and the rod cavity one-way valve 11.

[0038] The principle and implementation mode of the utility model are described by applying specific examples in the utility model, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, according to the idea of the utility model, the specific implementation mode and application range will be changed by the general technical personnel in the field. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A protection system for a piston hydraulic cylinder, characterized in that: The system comprises an oil inlet main oil path, an oil return main oil path, a plug cavity main oil path, a rod cavity main oil path, a hydraulic control oil path, a three-position four-way proportional directional valve, a two-position four-way electromagnetic valve, a first hydraulic control check valve, a second hydraulic control check valve, a third hydraulic control check valve, and a check valve.

2. The protection system for a piston hydraulic cylinder according to claim 1, characterized in that: The plug cavity main oil path is provided with a secondary pressure balance valve.

3. The protection system for a piston hydraulic cylinder according to claim 1, characterized in that: The plug cavity main oil path is provided with a first ball valve.

4. The protection system for a piston hydraulic cylinder according to claim 1, characterized in that: The rod cavity main oil path is provided with a second ball valve.

5. The protection system for a piston hydraulic cylinder according to claim 1, characterized in that: The oil inlet main oil path is provided with a first pressure measuring connector.

6. A protection system for a hydraulic piston ram as defined in claim 5, characterized in that: The first pressure measuring connector is connected to one end of a pressure measuring hose, and the other end of the pressure measuring hose is provided with a pressure gauge.

7. The protection system for a piston hydraulic cylinder according to claim 1, characterized in that: The plug cavity main oil path is provided with a second pressure measuring connector.

8. The protection system for a piston hydraulic cylinder according to claim 1, characterized in that: The rod cavity main oil path is provided with a third pressure measuring connector.

9. The protection system for a piston hydraulic cylinder according to claim 1, characterized in that: The hydraulic control oil path is provided with a fourth pressure measuring connector.

10. A hydraulic drive system characterized by: The system comprises a piston hydraulic cylinder and a protection system of the piston hydraulic cylinder according to any one of claims 1 to 9.

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