CN203559442U - Priority control circuit for bucket rod of excavating machine - Google Patents
Priority control circuit for bucket rod of excavating machine Download PDFInfo
- Publication number
- CN203559442U CN203559442U CN201320607831.6U CN201320607831U CN203559442U CN 203559442 U CN203559442 U CN 203559442U CN 201320607831 U CN201320607831 U CN 201320607831U CN 203559442 U CN203559442 U CN 203559442U
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- dipper
- valve
- hydraulic cylinder
- pressure
- preferential
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Abstract
A priority control circuit for a bucket rod of an excavating machine adopts the structure that in a hydraulic circuit, a hydraulic pilot-operated type bucket rod priority valve is arranged on the inlet side of a bucket control valve; when the bucket rod and the bucket combine to withdraw, the bucket rod priority valve works through a bucket rod withdrawing pilot-operated pressure, so as to throttle the inlet flow of the bucket control valve and allow the bucket rod to act first; a bucket rod priority release valve is arranged on a bucket rod withdrawing pilot-operated control oil circuit, used for the on-off control of the bucket rod withdrawing pilot-operated control oil circuit for controlling the bucket rod priority valve, and is controlled by a rodless cavity pressure of a bucket rod hydraulic cylinder. The control circuit has the advantages that when the excavating machine excavates and the pressure of the rodless cavity pressure of the bucket rod hydraulic cylinder surpasses a set pressure, the priority throttling of the bucket rod priority valve is removed, so that the hydraulic oil can smoothly enter the bucket hydraulic cylinder, thereby improving the bucket excavation speed while reducing the energy consumption of the bucket rod priority valve.
Description
Technical field
The utility model relates to a kind of excavator, particularly relate to a kind of preferential control loop of dipper of excavator.
Background technology
Take the multi-way valve system of KYB minus flow control as example, as shown in Figure 3, under normal circumstances, dipper control valve 3 is by main pump 1 fuel feeding, dipper converging valve 7 and scraper bowl control valve 9 be by main pump 2 fuel feeding, and at the oil circuit in parallel of main pump 2 sides to being provided with a dipper pressure-gradient control valve 11 between scraper bowl control valve 9.When dipper, scraper bowl carry out compound interior receipts action, by dipper pressure-gradient control valve 11, move, can suppress oil circuit in parallel and flow to the flow of scraper bowl control valve 9, make hydraulic oil preferentially supply with dipper converging valve 7, improve dipper hydraulic cylinder 4 interior receipts speed.Dipper, compound interior time receiving of scraper bowl, at idling, carry and during low load mining, the load pressure of scraper bowl hydraulic cylinder 6 is generally low compared with dipper hydraulic cylinder 4 pressure, therefore need dipper pressure-gradient control valve to carry out throttling to scraper bowl connection.Problem is, under heavy duty is excavated, the load of dipper hydraulic cylinder is still large compared with scraper bowl hydraulic cylinder load pressure.But now, dipper hydraulic cylinder 4 is little to traffic demand on the one hand, and the work of dipper pressure-gradient control valve has produced certain restriction loss, and easily causes system overflow.On the other hand, scraper bowl hydraulic cylinder 6 load pressures are low, and the throttling of dipper pressure-gradient control valve 11 has affected receipts speed in scraper bowl.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of when receipts in dipper, scraper bowl run into heavy duty, removes the preferential throttling of dipper pressure-gradient control valve, to reduce the energy consumption of pressure-gradient control valve, promotes the preferential control loop of dipper of the excavator of receipts speed in scraper bowl.
A kind of preferential control loop of dipper of excavator, comprise the main pump that hydraulic power source is provided to scraper bowl hydraulic cylinder and dipper hydraulic cylinder, make dipper, scraper bowl carries out scraper bowl hydraulic cylinder and the dipper hydraulic cylinder of outer pendulum and the action of interior receipts, be connected with described main pump and control and enter the scraper bowl control valve of scraper bowl hydraulic cylinder and dipper hydraulic cylinder hydraulic oil respectively, dipper control valve and dipper converging valve, at dipper, the flow that the compound interior time receiving restriction of scraper bowl flows into scraper bowl hydraulic cylinder makes the preferential dipper pressure-gradient control valve of receipts in dipper, also comprise the preferential relief valve of dipper, the preferential relief valve of described dipper is arranged on guide's oil circuit of dipper pressure-gradient control valve, guide's oil circuit of the preferential relief valve of described dipper is connected with dipper hydraulic cylinder rodless cavity.
The preferential relief valve of described dipper is electromagnetic type reversal valve, the preferential relief valve guide of described dipper oil circuit is provided with pressure sensor and controller, make the rodless cavity pressure of described dipper hydraulic cylinder be converted to signal of telecommunication input control device, thereby by controller comparison dipper rodless cavity pressure and setting pressure size, control the break-make of described dipper pressure-gradient control valve.
The preferential relief valve of described dipper is pilot operated directional control valve.
The beneficial effects of the utility model are in dipper, compound interior time receiving of scraper bowl, not only possess the preferential effect of dipper to scraper bowl when zero load, low load, possess the releasing of dipper pressure-gradient control valve throttling when heavy duty simultaneously, can promote receipts speed and reduction system energy consumption in scraper bowl.
Accompanying drawing explanation
Fig. 1 is the hydraulic schematic diagram of the first embodiment of the utility model patent;
Fig. 2 is the hydraulic schematic diagram of the second embodiment of the utility model patent;
Fig. 3 is the banked direction control valves hydraulic schematic diagram of existing minus flow control;
The specific embodiment
Below in conjunction with accompanying drawing, the embodiment of the utility model patent is illustrated:
Embodiment one:
As shown in Figure 1, main pump 1 exports leads up to series connection oil circuit and connects fuel tank through dipper control valve 3, the oil circuit in parallel of separately leading up to connects load one way valve, the rear connection dipper of dipper control valve 3 hydraulic cylinder 4, main pump 2 outlet is leaded up to series connection oil circuit and is connected scraper bowl control valve 9, dipper converging valve 7 and fuel tank, another oil circuit in parallel connects respectively dipper pressure-gradient control valve 11, scraper bowl control valve 9 and scraper bowl hydraulic cylinder, and collaborates to dipper control valve 3 by load one way valve, dipper converging valve 7.
On guide's oil circuit of dipper pressure-gradient control valve 11, add a preferential relief valve 10 of dipper, it is a hydraulic control two position three-way valve, and draw the pilot control pressure of dipper hydraulic cylinder 4 rodless cavity pressure as the preferential relief valve of this dipper, and another outlet of the preferential relief valve 10 of dipper is connected fuel tank with drain tap.Therefore, in dipper, scraper bowl in receipts process, when dipper hydraulic cylinder 4 rodless cavity pressure rises are to exceeding when setting value (the pilot control pressure of the preferential relief valve 10 of dipper is by the leading role area of the preferential relief valve 10 of dipper and the setting of its back-moving spring rigidity), the preferential relief valve 10 of dipper can cut off the pilot pressure of dipper pressure-gradient control valve 11, the preferential throttling of dipper pressure-gradient control valve 11 is removed, to reduce the energy consumption of dipper pressure-gradient control valve 11, promote scraper bowl excavation speed.
Concrete control method is as follows:
When pressure in dipper hydraulic cylinder 4 rodless cavities is lower than when setting value, the preferential relief valve 10 of dipper is in reset mode, guide's oil circuit of dipper pressure-gradient control valve 11 is communicated with, thus dipper pressure-gradient control valve 11 work and suppress to flow to the flow of scraper bowl control valve, make hydraulic oil preferentially supply with dipper converging valve; When dipper hydraulic cylinder 4 rodless cavity pressure are higher than when setting value, dipper pressure-gradient control valve relief valve 10 is in running order, cuts off guide's oil circuit of dipper pressure-gradient control valve 11, and dipper pressure-gradient control valve 11 is resetted, and has removed the preferential restriction effect of dipper pressure-gradient control valve 11.
Embodiment two:
As shown in Figure 2, main pump 1 exports leads up to series connection oil circuit and connects fuel tank through dipper control valve 3, the oil circuit in parallel of separately leading up to connects load one way valve, the rear connection dipper of dipper control valve 3 hydraulic cylinder 4, main pump 2 outlet is leaded up to series connection oil circuit and is connected scraper bowl control valve 9, dipper converging valve 7 and fuel tank, another oil circuit in parallel connects respectively dipper pressure-gradient control valve 11, scraper bowl control valve 9 and scraper bowl hydraulic cylinder, and collaborates to dipper control valve 3 by load one way valve, dipper converging valve 7.
The preferential relief valve 10 of dipper adding on guide's oil circuit of dipper pressure-gradient control valve is an electromagnetic type two position three-way valve, and utilizes pressure sensor 12 that the rodless cavity pressure of dipper hydraulic cylinder 4 is converted to signal of telecommunication input control device.Controller is dipper rodless cavity pressure and setting pressure size relatively, when rodless cavity pressure is greater than setup pressure value, the preferential relief valve 10 of controller output electrical signals control dipper cuts off the pilot pressure of dipper pressure-gradient control valve 11, the preferential throttling of dipper pressure-gradient control valve 11 is removed, the same energy consumption that reduces dipper pressure-gradient control valve 11 that realizes, promotes scraper bowl excavation speed.
Claims (3)
1. the preferential control loop of the dipper of an excavator, comprise the main pump that hydraulic power source is provided to scraper bowl hydraulic cylinder and dipper hydraulic cylinder, make dipper, scraper bowl carries out scraper bowl hydraulic cylinder and the dipper hydraulic cylinder of outer pendulum and the action of interior receipts, be connected with described main pump and control and enter the scraper bowl control valve of scraper bowl hydraulic cylinder and dipper hydraulic cylinder hydraulic oil respectively, dipper control valve and dipper converging valve, at dipper, the flow that the compound interior time receiving restriction of scraper bowl flows into scraper bowl hydraulic cylinder makes the preferential dipper pressure-gradient control valve of receipts in dipper, it is characterized in that: also comprise the preferential relief valve of dipper, the preferential relief valve of described dipper is arranged on guide's oil circuit of dipper pressure-gradient control valve, guide's oil circuit of the preferential relief valve of described dipper is connected with dipper hydraulic cylinder rodless cavity.
2. the preferential control loop of the dipper of a kind of excavator according to claim 1, it is characterized in that: the preferential relief valve of described dipper is electromagnetic type reversal valve, the preferential relief valve guide of described dipper oil circuit is provided with pressure sensor and controller, make the rodless cavity pressure of described dipper hydraulic cylinder be converted to signal of telecommunication input control device, thereby by controller comparison dipper rodless cavity pressure and setting pressure size, control the break-make of described dipper pressure-gradient control valve.
3. the preferential control loop of the dipper of a kind of excavator according to claim 1, is characterized in that: the preferential relief valve of described dipper is pilot operated directional control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320607831.6U CN203559442U (en) | 2013-09-29 | 2013-09-29 | Priority control circuit for bucket rod of excavating machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320607831.6U CN203559442U (en) | 2013-09-29 | 2013-09-29 | Priority control circuit for bucket rod of excavating machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203559442U true CN203559442U (en) | 2014-04-23 |
Family
ID=50509173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320607831.6U Withdrawn - After Issue CN203559442U (en) | 2013-09-29 | 2013-09-29 | Priority control circuit for bucket rod of excavating machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203559442U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103498491A (en) * | 2013-09-29 | 2014-01-08 | 山河智能装备股份有限公司 | Bucket rod prior control loop of excavator and bucket rod control method |
| CN106574642A (en) * | 2014-10-07 | 2017-04-19 | 日立建机株式会社 | Hydraulic control apparatus for construction equipment |
-
2013
- 2013-09-29 CN CN201320607831.6U patent/CN203559442U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103498491A (en) * | 2013-09-29 | 2014-01-08 | 山河智能装备股份有限公司 | Bucket rod prior control loop of excavator and bucket rod control method |
| CN103498491B (en) * | 2013-09-29 | 2015-08-19 | 山河智能装备股份有限公司 | A kind of dipper prior control loop of excavator and control method thereof |
| CN106574642A (en) * | 2014-10-07 | 2017-04-19 | 日立建机株式会社 | Hydraulic control apparatus for construction equipment |
| CN106574642B (en) * | 2014-10-07 | 2018-04-27 | 日立建机株式会社 | The hydraulic control device of engineering machinery |
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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: 20140423 Effective date of abandoning: 20150819 |
|
| RGAV | Abandon patent right to avoid regrant |