CN201793328U - Protective device of bivalve grab bucket hydraulic control system - Google Patents
Protective device of bivalve grab bucket hydraulic control system Download PDFInfo
- Publication number
- CN201793328U CN201793328U CN2010205249234U CN201020524923U CN201793328U CN 201793328 U CN201793328 U CN 201793328U CN 2010205249234 U CN2010205249234 U CN 2010205249234U CN 201020524923 U CN201020524923 U CN 201020524923U CN 201793328 U CN201793328 U CN 201793328U
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- hydraulic control
- oil
- valve
- oil cylinder
- control system
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Abstract
The utility model discloses a protective device of a bivalve grab bucket hydraulic control system, which is applied to the technical field of hoisting and loading-unloading equipment. The protective device comprises an oil pump, two oil cylinders, an external oil tank and a hydraulic control system connected with the oil pump and the oil cylinders, wherein each oil cylinder is provided with an oil cylinder upper cavity and an oil cylinder lower cavity; the protective device further comprises a solenoid valve, an overflow valve and a first pressure switch and a second pressure switch which are respectively and electrically connected with the solenoid valve; the hydraulic control system comprises a left-side hydraulic control one-way valve connected with the oil cylinder upper cavity and the oil cylinder lower cavity by a pipeline; the oil pump is respectively connected with the external oil tank and the hydraulic control system by a pipeline via the one-way valve; the solenoid valve and the overflow valve are arranged between the one-way valve and the external oil tank in parallel; and the first pressure switch and the second pressure switch are respectively connected with an oil cylinder upper cavity pipeline and an oil cylinder lower cavity pipeline of the hydraulic control system by a pipeline. According to the utility model, by using the solenoid valve, the overflow valve, the first pressure switch and the second pressure switch to control the pipeline pressure intensity of the hydraulic control system and prevent the hydraulic control system from generating faults, the normal work of the hydraulic control system can be ensured.
Description
Technical field
The utility model belongs to the hoisting and handling equipment technical field, relates to a kind of hydraulic control system protection device, relates in particular to a kind of two-valve grab hydraulic control system protection device.
Background technology
Hydraulic control system of bivalve grab bucket is when starting and during the switching of grab bucket conversion, because valve piece inner spool has certain response time, so the instantaneous pressure in the oil pipe is very high, easily the initiation solution pressure-controlled system failure.
A kind of two-valve grab hydraulic control system protection device need be provided, and the pipeline pressure of controlled hydraulic system prevents the hydraulic control system et out of order, thereby guarantees the normal operation of hydraulic control system.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of two-valve grab hydraulic control system protection device, the pipeline pressure of controlled hydraulic system, thus overcome hydraulic control system of the prior art because the excessive and defective of et out of order of pressure.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of two-valve grab hydraulic control system protection device; comprise oil pump; two corresponding oil cylinders that drive the grab bucket lobe; external fuel tank and the hydraulic control system that connects oil pump and oil cylinder; oil cylinder has oil cylinder epicoele and oil cylinder cavity of resorption; also comprise electromagnetic valve; by pass valve; first pressure switch that is electrically connected with electromagnetic valve respectively and second pressure switch; hydraulic control system comprises that pipeline connects the left side hydraulic control one-way valve of oil cylinder epicoele and oil cylinder cavity of resorption; oil pump connects external fuel tank and hydraulic control system through check valve difference pipeline; electromagnetic valve and by pass valve are arranged in parallel between check valve and external fuel tank, and first pressure switch is connected the oil cylinder epicoele and the oil cylinder cavity of resorption pipeline of hydraulic control system with second pressure switch difference pipeline.
Hydraulic control system of the present utility model also comprises change-over valve, the left side check valve, the right one-way valve, left side hydraulic control one-way valve and right side hydraulic control one-way valve, change-over valve comprises the left side oil inlet, the right side oil inlet, left side oil outlet and right side oil outlet, oil pump connects left side oil inlet and right side oil inlet through the check valve pipeline, the left side oil outlet is connected oil cylinder epicoele and oil cylinder cavity of resorption through the left side check valve with right one-way valve pipeline respectively with the right side oil outlet, left side oil outlet pipeline respectively connects the upward pressure mouth of left side hydraulic control one-way valve and the downforce mouth of right side hydraulic control one-way valve, right side oil outlet pipeline respectively connects the downforce mouth of left side hydraulic control one-way valve and the upward pressure mouth of right side hydraulic control one-way valve, and the oil cylinder cavity of resorption connects external fuel tank through right side hydraulic control one-way valve pipeline.
Adopt the beneficial effect of technique scheme:
First pressure switch and second pressure switch that the utility model adopts, when the pressure of hydraulic oil pipeline that comes out from oil cylinder epicoele or oil cylinder epicoele surpasses the pressure that first pressure switch or second pressure switch bear, with oil cylinder epicoele and oil cylinder epicoele bonded assembly first pressure switch and the second pressure switch control electromagnetic valve conducting, make the hydraulic oil that comes out from oil pump directly drain into external fuel tank; The by pass valve that the utility model adopted, when the pressure of the hydraulic oil that comes out through oil pump in pipeline surpasses the pressure that by pass valve bore, by pass valve is with automatic conducting, make the hydraulic oil that comes out from oil pump directly drain into external fuel tank, the pipeline pressure of controlled hydraulic system, prevent the hydraulic control system et out of order, thereby guarantee the normal operation of hydraulic control system.
Description of drawings
Fig. 1 is a systematic schematic diagram of the present utility model.
Wherein:
010-oil pump, 011-check valve, 020-hydraulic control system, 030-oil cylinder, 031-oil cylinder epicoele, 032-oil cylinder cavity of resorption, 040-by pass valve, 050-electromagnetic valve, 061-the first pressure switch, 062-the second pressure switch.
The specific embodiment
Below in conjunction with specific embodiment the utility model is further described:
See also Fig. 1, it is a systematic schematic diagram of the present utility model, comprises oil pump 010, hydraulic control system 020, oil cylinder 030, external fuel tank, by pass valve 040, electromagnetic valve 050, first pressure switch 061 that is electrically connected with by pass valve 040 respectively and second pressure switch 062.
Change-over valve is a three position four-way electrohy-draulic valve.Change-over valve has left side oil inlet, right side oil inlet, left side oil outlet and right side oil outlet.Change-over valve can pass through the valve regulated oil outlet, makes the left side oil outlet fuel-displaced or the right side oil outlet is fuel-displaced.
The hydraulic oil that comes out from the left side oil outlet is divided into three the tunnel: the first via, and the left side oil outlet connects oil cylinder epicoele 031 through left side check valve pipeline; The second the tunnel, left side oil outlet pipeline connects the upward pressure mouth of left side hydraulic control one-way valve, and the pipeline of left side oil outlet between left side oil outlet and left side check valve is connected with the upward pressure mouth of left side hydraulic control one-way valve; Third Road, left side oil outlet pipeline connects the downforce mouth of right side hydraulic control one-way valve, and the pipeline of left side oil outlet between left side oil outlet and left side check valve is connected with the downforce mouth of right side hydraulic control one-way valve.
The hydraulic pressure oil content that comes out from the right side oil outlet also is three the tunnel: the first via, and the right side oil outlet connects oil cylinder cavity of resorption 032 through right one-way valve pipeline; The second the tunnel, right side oil outlet pipeline connects the upward pressure mouth of right side hydraulic control one-way valve, and the right side oil outlet is connected with the upward pressure mouth of right side hydraulic control one-way valve with pipeline between the right one-way valve through the right side oil outlet; Third Road, right side oil outlet pipeline connect the downforce mouth of left side hydraulic control one-way valve, and the right side oil outlet is connected with the downforce mouth of left side hydraulic control one-way valve with pipeline between the right one-way valve through the right side oil outlet.
Oil cylinder cavity of resorption 032 connects external fuel tank through right side hydraulic control one-way valve pipeline, and oil cylinder cavity of resorption 032 is connected with the right side hydraulic control one-way valve with pipeline between the oil cylinder cavity of resorption 032 through the right one-way valve.
When the valve regulated of change-over valve during to the left side oil outlet, hydraulic oil flows out from the left side oil outlet.
The hydraulic oil that flows out from the left side oil outlet flow to oil cylinder epicoele 031 through the left side check valve, and the pressure of oil cylinder epicoele 031 increases, and makes oil cylinder 030 piston move down, and the hydraulic oil of oil cylinder cavity of resorption 032 flows out from oil cylinder cavity of resorption 032 simultaneously.
Simultaneously, the hydraulic oil that flows out from the left side oil outlet also can flow to the upward pressure mouth of left side hydraulic control one-way valve and the downforce mouth of right side hydraulic control one-way valve.The hydraulic oil that flows to left side hydraulic control one-way valve upward pressure mouth makes the left side hydraulic control one-way valve be in closed condition, and the hydraulic oil that flows to right side hydraulic control one-way valve downforce mouth makes the right side hydraulic control one-way valve be in conducting state.
This makes the hydraulic oil that flows out from oil cylinder cavity of resorption 032 flow to external fuel tank through the right side hydraulic control one-way valve.
This process has been finished the grasping manipulation of bivalve grab bucket.
The utility model adopt to be regulated the oil outlet of change-over valve, and this makes the operation that oil pump 010 does not need the conversion rotation direction to grasp and to unclamp, thereby reduces misoperation, increases work efficiency.
When the valve regulated of change-over valve during to the right side oil outlet, hydraulic oil flows out from the right side oil outlet.
The hydraulic oil that flows out from the right side oil outlet flow to oil cylinder cavity of resorption 032 through the right one-way valve, and the pressure of oil cylinder cavity of resorption 032 increases, and makes oil cylinder 030 piston move up, and the hydraulic oil of oil cylinder epicoele 031 flows out from oil cylinder epicoele 031 simultaneously.
Simultaneously, the hydraulic oil that flows out from the right side oil outlet also can flow to the downforce mouth of left side hydraulic control one-way valve and the upward pressure mouth of right side hydraulic control one-way valve.The hydraulic oil that flows to left side hydraulic control one-way valve downforce mouth makes the left side hydraulic control one-way valve be in conducting state, and the hydraulic oil that flows to right side hydraulic control one-way valve upward pressure mouth makes the right side hydraulic control one-way valve be in closed condition.
This makes the hydraulic oil that flows out from oil cylinder epicoele 031 flow to oil cylinder cavity of resorption 032 through the left side hydraulic control one-way valve.At this moment, hydraulic oil can not flow to external fuel tank, but flows into oil cylinder cavity of resorption 032 from oil cylinder epicoele 031.
This process has been finished the unclamp operation of bivalve grab bucket.
The left side hydraulic control one-way valve that the utility model adopts is communicated with oil cylinder epicoele 031 and oil cylinder cavity of resorption 032, be implemented in the grab bucket bivalve release process, the pressure of oil cylinder cavity of resorption 032 increases, make the thrust of 030 pair of bivalve of oil cylinder increase, thereby the lobe of avoiding grabbing bucket unloads not exclusively because of deadweight falls the goods that causes after rise in the process of unclamping, and increases work efficiency.
The maxim of bearing pressure that by pass valve 040 is provided with in the present embodiment is 23 MPas.
When the pressure of the hydraulic oil that comes out through oil pump 010 in pipeline surpassed 23 MPas, by pass valve 040 made the hydraulic oil that comes out from oil pump 010 directly drain into external fuel tank automatic conducting, to reduce the pressure of pipeline, prevents hydraulic control system 020 et out of order.
The maxim of bearing pressure that first pressure switch 061 and second pressure switch 062 are provided with in the present embodiment is 20 MPas.
When the pressure of hydraulic oil pipeline that comes out from oil cylinder epicoele 031 or oil cylinder epicoele 032 surpasses 20 MPas, respectively with oil cylinder epicoele 031 and oil cylinder cavity of resorption 032 bonded assembly, first pressure switch 061 and 050 conducting of second pressure switch, 062 control electromagnetic valve, make the hydraulic oil that comes out from oil pump 010 directly drain into external fuel tank, to reduce the pressure of pipeline, prevent hydraulic control system 020 et out of order.
The above-mentioned specific embodiment is exemplary, be in order better to make those skilled in the art can understand this patent, can not be interpreted as it is the restriction that this patent is comprised scope, so long as according to spirit that this patent discloses done anyly be equal to change or modify, all fall into the scope that this patent comprises.
Claims (2)
1. two-valve grab hydraulic control system protection device; comprise oil pump; two corresponding oil cylinders that drive the grab bucket lobe; external fuel tank and the hydraulic control system that connects described oil pump and oil cylinder; described oil cylinder has oil cylinder epicoele and oil cylinder cavity of resorption; it is characterized in that: also comprise electromagnetic valve; by pass valve; first pressure switch that is electrically connected with electromagnetic valve respectively and second pressure switch; described hydraulic control system comprises that pipeline connects the left side hydraulic control one-way valve of described oil cylinder epicoele and oil cylinder cavity of resorption; described oil pump through check valve respectively pipeline connect described external fuel tank and hydraulic control system; described electromagnetic valve and by pass valve are arranged in parallel between described check valve and external fuel tank, and described first pressure switch and second pressure switch pipeline respectively are connected the oil cylinder epicoele and the oil cylinder cavity of resorption pipeline of described hydraulic control system.
2. two-valve grab hydraulic control system protection device according to claim 1; it is characterized in that: described hydraulic control system also comprises change-over valve; the left side check valve; the right one-way valve; left side hydraulic control one-way valve and right side hydraulic control one-way valve; described change-over valve comprises the left side oil inlet; the right side oil inlet; left side oil outlet and right side oil outlet; described oil pump connects described left side oil inlet and right side oil inlet through the check valve pipeline; described left side oil outlet is connected described oil cylinder epicoele and oil cylinder cavity of resorption through the left side check valve with right one-way valve pipeline respectively with the right side oil outlet; described left side oil outlet pipeline respectively connects the upward pressure mouth of described left side hydraulic control one-way valve and the downforce mouth of described right side hydraulic control one-way valve; described right side oil outlet pipeline respectively connects the downforce mouth of described left side hydraulic control one-way valve and the upward pressure mouth of described right side hydraulic control one-way valve, and described oil cylinder cavity of resorption connects external fuel tank through described right side hydraulic control one-way valve pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205249234U CN201793328U (en) | 2010-09-10 | 2010-09-10 | Protective device of bivalve grab bucket hydraulic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205249234U CN201793328U (en) | 2010-09-10 | 2010-09-10 | Protective device of bivalve grab bucket hydraulic control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201793328U true CN201793328U (en) | 2011-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205249234U Expired - Lifetime CN201793328U (en) | 2010-09-10 | 2010-09-10 | Protective device of bivalve grab bucket hydraulic control system |
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| Country | Link |
|---|---|
| CN (1) | CN201793328U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101927961A (en) * | 2010-09-10 | 2010-12-29 | 上海电气液压气动有限公司 | Two-valve grab hydraulic control system protection device |
-
2010
- 2010-09-10 CN CN2010205249234U patent/CN201793328U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101927961A (en) * | 2010-09-10 | 2010-12-29 | 上海电气液压气动有限公司 | Two-valve grab hydraulic control system protection device |
| CN101927961B (en) * | 2010-09-10 | 2012-02-29 | 上海电气液压气动有限公司 | Two-valve grab hydraulic control system protection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110413 Effective date of abandoning: 20120229 |