CN112302346A - Boom hydraulic system and concrete pump truck - Google Patents
Boom hydraulic system and concrete pump truck Download PDFInfo
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- CN112302346A CN112302346A CN202011003485.1A CN202011003485A CN112302346A CN 112302346 A CN112302346 A CN 112302346A CN 202011003485 A CN202011003485 A CN 202011003485A CN 112302346 A CN112302346 A CN 112302346A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/04—Devices for both conveying and distributing
- E04G21/0418—Devices for both conveying and distributing with distribution hose
- E04G21/0445—Devices for both conveying and distributing with distribution hose with booms
- E04G21/0463—Devices for both conveying and distributing with distribution hose with booms with boom control mechanisms, e.g. to automate concrete distribution
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/04—Devices for both conveying and distributing
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- Mechanical Engineering (AREA)
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Abstract
The disclosure relates to an arm support hydraulic system and a concrete pump truck. The system comprises: the system comprises an oil pump, an arm frame multi-way valve and an actuating mechanism; the oil pump is connected with each control valve in the arm frame multi-way valve and used for pumping hydraulic oil to each control valve; at least one target control valve in the arm frame multi-way valve is connected with the N executing mechanisms, the target control valve is used for controlling the target executing mechanism corresponding to an operation instruction input by a user to execute corresponding action under the action of hydraulic oil, wherein N is more than or equal to 2 and less than N, and N is the total number of the executing mechanisms. Because at least one target control valve in the boom multi-way valve is connected with a plurality of actuating mechanisms, compared with the related art, the number of the control valves can be effectively reduced, and the structure of the boom hydraulic system is simplified.
Description
Technical Field
The disclosure relates to the technical field of engineering machinery, in particular to an arm support hydraulic system and a concrete pump truck.
Background
In concrete pumping equipment, an arm support hydraulic system is mainly used for controlling the rotation of an arm support and the expansion, folding, rotation, folding and other actions of each arm section of the arm support. Because the movement speed and direction of the hydraulic motor for rotation and the hydraulic cylinders need to be controlled, the boom hydraulic system generally adopts a piece of valve to control one hydraulic motor or hydraulic cylinder to form a reversing control loop. In concrete pumping equipment, a boom hydraulic system of a common type can be seen in fig. 1.
Fig. 1 is a schematic structural diagram of a boom hydraulic system in the related art. In fig. 1, an oil pump 1 is a power source of a boom hydraulic system, and a boom multi-way valve 2 is a control element of the system, and is mainly used for controlling the reversing of the actuating mechanisms 301 to 306 so as to control the unfolding, folding, rotating, folding and other actions of each boom section of the boom. The boom multi-way valve 2 can be composed of a plurality of control valves. As shown in fig. 1, the boom multi-way valve 2 includes 6 control valves, namely a first control valve 201, a second control valve 202, a third control valve 203, a fourth control valve 204, a fifth control valve 205 and a sixth control valve 206, and one control valve controls one actuator to act. For example, the first control valve 201 controls the actuation of the first actuator 301, the second control valve 202 controls the actuation of the second actuator 302, and so on. In addition, an oil outlet P of the oil pump 1 is respectively connected with an oil outlet (for example: A1, A2, A3, A4, A5 and A6) of each control valve, and an oil return port T of the oil pump 1 is respectively connected with an oil return port (for example: B1, B2, B3, B4, B5 and B6) (not shown in FIG. 1) of each control valve, so that the control valves can realize the control of the actuating mechanism under the action of hydraulic oil.
Therefore, in the related art, the number of control valves of the boom multi-way valve needs to be consistent with the number of the actuating mechanisms, and when the number of the actuating mechanisms is large, the number of the control valves is also large, so that the boom hydraulic system is complex in structure and high in cost.
Disclosure of Invention
The invention aims to provide a boom hydraulic system and a concrete pump truck, and aims to solve the problems in the related art.
In order to achieve the above object, a first aspect of the present disclosure provides a boom hydraulic system, including: the system comprises an oil pump, an arm frame multi-way valve and an actuating mechanism;
the oil pump is connected with each control valve in the arm frame multi-way valve and used for pumping hydraulic oil to each control valve;
at least one target control valve in the arm frame multi-way valve is connected with the N executing mechanisms, the target control valve is used for controlling the target executing mechanism corresponding to an operation instruction input by a user to execute corresponding action under the action of hydraulic oil, wherein N is more than or equal to 2 and less than N, and N is the total number of the executing mechanisms.
Optionally, the boom hydraulic system further includes: the number of the position switching mechanisms is the same as that of the target control valves, wherein the ith target control valve is connected with the n executing mechanisms through the ith position switching mechanism, the value range of i is 1-M, and M is the number of the target control valves;
the position switching mechanism can respond to the operation instruction, and the target control valve connected with the position switching mechanism is controlled to be communicated with the target execution mechanism, so that the target control valve controls the target execution mechanism to execute corresponding actions.
Optionally, the position switching mechanism is a solenoid valve and/or a hydraulic valve.
Optionally, n is 2, and the position switching mechanism comprises a first solenoid valve and a second solenoid valve; the oil inlet ends of a first executing mechanism and a second executing mechanism which are connected with the target control valve are connected with a first electromagnetic valve, and the oil return ends of the first executing mechanism and the second executing mechanism are connected with a second electromagnetic valve;
when the operation instruction is a power-off instruction, the target execution mechanism is the first execution mechanism, and when the operation instruction is a power-on instruction, the target execution mechanism is the second execution mechanism.
Optionally, the position switching mechanism comprises n solenoid valves; each of the n actuators is connected to the target control valve via an electromagnetic valve.
Optionally, the position switching mechanism comprises 2n solenoid valves; and the oil inlet end and the oil return end of each of the n executing mechanisms are respectively connected with the target control valve through an electromagnetic valve.
Optionally, the boom hydraulic system further includes: the number of the balance valves is N;
each balance valve is connected with one actuating mechanism and used for balancing the load of the actuating mechanism.
Optionally, the boom hydraulic system further includes: a switch;
the switch is used for generating the operation instruction according to user operation.
Optionally, the actuator is a hydraulic ram or a hydraulic motor.
The second aspect of the disclosure further provides a concrete pump truck, and the boom hydraulic system provided by the first aspect of the disclosure is arranged on the concrete pump truck.
The boom hydraulic system provided by the disclosure comprises an oil pump, a boom multi-way valve and an actuating mechanism; the oil pump is connected with each control valve in the boom multi-way valve and used for pumping hydraulic oil to each control valve; at least one target control valve in the arm frame multi-way valve is connected with the N executing mechanisms, the target control valve is used for controlling the target executing mechanism corresponding to an operation instruction input by a user to execute corresponding action under the action of hydraulic oil, wherein N is more than or equal to 2 and less than N, and N is the total number of the executing mechanisms. Because at least one target control valve in the boom multi-way valve is connected with a plurality of actuating mechanisms, compared with the related art, the number of the control valves can be effectively reduced, and the structure of the boom hydraulic system is simplified.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a schematic structural diagram of a boom hydraulic system in the related art.
Fig. 2 is a schematic diagram of a boom hydraulic system shown in accordance with an exemplary embodiment.
Fig. 3 is a schematic diagram of another boom hydraulic system shown in accordance with an exemplary embodiment.
Fig. 4 is a schematic diagram of another boom hydraulic system shown in accordance with an exemplary embodiment.
Fig. 5 is a schematic diagram of another boom hydraulic system shown in accordance with an exemplary embodiment.
Description of the reference numerals
1 oil pump 2 arm support multi-way valve
201 first control valve 202 second control valve
203 third control valve 204 fourth control valve
205 fifth control valve 206 sixth control valve
301 first actuator 302 second actuator
303 third actuator 304 fourth actuator
305 fifth actuator 306 sixth actuator
307 seventh actuator 401 first balance valve
402 second counter balance valve 403 third counter balance valve
404 fourth Balanced valve 405 fifth balanced valve
406 sixth counter balance valve 407 seventh counter balance valve
501 first solenoid valve 502 second solenoid valve
503 third solenoid valve 504 fourth solenoid valve
505 fifth solenoid valve 506 sixth solenoid valve
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
As background art, each control valve in the boom hydraulic system in the related art only controls one actuator, and when the number of the actuators is large, the number of the control valves is also large, which results in a complex boom hydraulic system structure and high cost. In view of this, the present disclosure provides a boom hydraulic system and a concrete pump truck.
Fig. 2 is a schematic diagram of a boom hydraulic system shown in accordance with an exemplary embodiment. As shown in fig. 2, the boom hydraulic system 20 includes an oil pump 1, a boom multi-way valve 2, and an actuator. It should be noted that, in general, the boom multi-way valve 2 is composed of a plurality of pieces or multiple pieces of control valves, and each control valve is used for controlling an actuating mechanism connected with the control valve.
In the present disclosure, the oil pump 1 is used to provide hydraulic oil required by the boom hydraulic system 20, and return oil during the operation of the boom hydraulic system 20. The boom multi-way valve 2 is a control element in the boom hydraulic system 20, and is used for controlling the steering of the actuating mechanism so as to control the unfolding, folding, rotating, folding and other actions of the boom sections. The actuating mechanism can be a hydraulic oil cylinder or a hydraulic motor, and the actuating mechanism needs to consume hydraulic oil when controlling the actions of unfolding, folding, rotating, folding and the like of the arm sections. Therefore, in the present disclosure, an oil pump 1 is connected to each control valve in the boom multi-way valve 2 for pumping hydraulic oil to each control valve.
At least one target control valve in the arm frame multi-way valve 2 is connected with N actuating mechanisms, each target control valve controls a target actuating mechanism corresponding to an operating instruction input by a user to execute corresponding action under the action of hydraulic oil, wherein N is more than or equal to 2 and less than N, and N is the total number of the actuating mechanisms.
It is worth noting that the actuators associated with each control valve are different, i.e., one actuator can only be associated with one control valve. Further, when there are a plurality of target control valves, the number of actuators connected to each target control valve may be the same or different, for example, three actuators may be connected to the target control valve K1, five actuators may be connected to the target control valve K2, and so on. The present disclosure does not specifically limit this, however, each target control valve is associated with at least two actuators.
In one embodiment, each control valve included in the boom multi-way valve 2 is connected to n actuators, i.e., each control valve included in the boom multi-way valve 2 is a target control valve.
In another embodiment, the number of the actuators connected to part of the control valves in the boom multi-way valve 2 is multiple, that is, the part of the control valves in the boom multi-way valve 2 are target control valves. In this embodiment, the number of actuators to which other control valves than the target control valve are connected is 1.
It should be noted that, in any of the above embodiments, any actuator included in the boom hydraulic system is connected to one of the control valves included in the boom multi-way valve.
For example, as shown in fig. 2, it is assumed that the boom multiplex valve 2 includes a first control valve 201, a second control valve 202, a third control valve 203, a fourth control valve 204, and a fifth control valve 205. The fifth control valve 205 is a target control valve and is connected to two actuators (e.g., a fifth actuator 305 and a sixth actuator 306), and the first control valve 201, the second control valve 202, the third control valve 203, and the fourth control valve 204 are connected to one actuator, respectively. For example, the first control valve 201 is connected to a first actuator 301, the second control valve 202 is connected to a second actuator 302, the third control valve 203 is connected to a third actuator 303, and the fourth control valve 204 is connected to a fourth actuator 304.
It should be noted that although the target control valve is connected to the fifth actuator 305 and the sixth actuator 306, in practical applications, the target control valve can only control one of the actuators (the fifth actuator 305 or the sixth actuator 306) to operate at the same time. Therefore, in the present disclosure, the target control valve may determine a target actuator to be currently controlled based on an operation instruction input by a user, and then control the target actuator to perform a corresponding action. The action executed by the target execution mechanism may be an action corresponding to the operation command, or may be an action associated with the target execution mechanism. For example, the action associated with the fifth actuator 305 in advance is a transmission action, the action associated with the sixth actuator 306 in advance is a stirring action, and if the target actuator is the sixth actuator 306, the action executed by the target actuator is the stirring action.
By adopting the technical scheme, at least one target control valve in the boom multi-way valve is connected with a plurality of actuating mechanisms, so that compared with the related art, the number of the control valves can be effectively reduced, and the structure of a boom hydraulic system is simplified.
In addition, most of the control valves in the boom multi-way valve are electric proportional control valves, and the electric proportional control valves are complex in structure and high in cost, so that one control valve controls a plurality of actuating mechanisms, the structure of a boom hydraulic system can be further simplified, and the cost can be effectively reduced.
In order to facilitate the objective control valve to control different objective actuators under different conditions, in an embodiment, the boom hydraulic system 20 may further include a position switching mechanism, and the objective control valve is connected to the n actuators through the position switching mechanism, so that the number of the position switching mechanisms is the same as that of the objective control valves in the present disclosure.
For example, assuming that the number of target control valves is M, the number of position switching mechanisms is also M, and the ith target control valve is connected to the n actuators through the ith position switching mechanism, and the value range of i is 1 to M.
The position switching mechanism can respond to an operation instruction input by a user, and control a target control valve connected with the position switching mechanism to be communicated with a target execution mechanism, so that the target control valve can control the target execution mechanism to execute corresponding actions. Wherein, the position switching mechanism can be a solenoid valve and/or a hydraulic valve. For the sake of description, the following description will be made with respect to only one of the target control valves.
In order to facilitate better understanding of the boom hydraulic system provided in the present disclosure, a boom hydraulic system is described below in a complete embodiment.
The boom hydraulic system may include a switch, wherein the switch may be a button, a single pole double throw switch, or the like. The switch may be used to generate an operation instruction according to a user operation. In one embodiment, one switch may be provided for each target control valve. For example, taking fig. 2 as an example, one switch may be provided to the fifth control valve 205, and the switch includes two states (e.g., a push-button switch includes a pressed state and a sprung state; a single pole double throw switch includes a closed state with a left contact and a closed state with a right contact). Taking the switch as an example of a push-button switch, when the user does not press the push-button switch, it indicates that the user needs the fifth control valve 205 to control the fifth actuator 305, and at this time, the push-button switch generates an operation instruction for characterizing control of the fifth actuator 305; when the user presses a push button switch, which generates an operating instruction indicative of the control of the sixth actuator 306, indicating that the user requires the fifth control valve 205 to control the sixth actuator 306.
The position switching mechanism can be an electromagnetic valve, the electromagnetic valve can be connected with a switch and used for receiving an operation instruction input by the switch, and then the electromagnetic valve can control the electromagnetic valve to be powered on or powered off according to the operation instruction.
In one embodiment, as shown in fig. 3, the position switching mechanism includes two solenoid valves, which are respectively identified as a first solenoid valve 501 and a second solenoid valve 502, wherein oil inlet ends of a first actuator (i.e., the fifth actuator 305) and a second actuator (i.e., the sixth actuator 306) connected to the target control valve are connected to the first solenoid valve 501, and oil return ends of the first actuator (i.e., the fifth actuator 305) and the second actuator (i.e., the sixth actuator 306) connected to the target control valve are connected to the second solenoid valve 502. It is to be noted that the states of the first solenoid valve 501 and the second solenoid valve 502 shown in fig. 3 are the power-off states.
The operation instruction can be a power-on instruction or a power-off instruction. The switch may be operated when the user wants the fifth control valve 205 to control the fifth actuator 305. For example, a push button switch is operated to be in a sprung state, and the push button switch may generate a power-down instruction for instructing the first solenoid valve 501 and the second solenoid valve 502 to be powered down. At this time, the target actuator is the first actuator (i.e., the fifth actuator 305). In this way, after the first solenoid valve 501 and the second solenoid valve 505 receive the power-off command, the first solenoid valve 501 and the second solenoid valve 502 are controlled to be powered off, at this time, the fifth control valve 205 is communicated with the fifth actuator 305, and the oil pump 1 can pump oil to the fifth actuator 305 through the oil outlet a5 of the fifth control valve 205 and return oil through the oil return port B5 of the fifth control valve 205.
Similarly, the user may operate the switch when he or she wants the fifth control valve 205 to control the sixth actuator 306. For example, a button switch is operated so as to be in a pressed state, and the button switch may generate a power-on instruction for instructing the first solenoid valve 501 and the second solenoid valve 505 to be powered on. At this time, the target actuator is the second actuator (i.e., the sixth actuator 306). In this way, after the first electromagnetic valve 501 and the second electromagnetic valve 505 receive the power-on command, the first electromagnetic valve 501 and the second electromagnetic valve 502 are controlled to be powered on, at this time, the fifth control valve 205 is communicated with the sixth actuator 306, and the oil pump 1 can pump oil to the sixth actuator 306 through the oil outlet a5 of the fifth control valve 205 and return oil through the oil return port B5 of the fifth control valve 205.
In another embodiment, the position switching mechanism may include n number of solenoid valves, that is, the position switching mechanism includes the same number of solenoid valves as the number of actuators to which the target control valve is connected. Illustratively, fig. 4 is a schematic diagram illustrating another boom hydraulic system according to an exemplary embodiment. As shown in fig. 4, the fifth control valve 205 is connected to a fifth actuator 305, a sixth actuator 306, and a seventh actuator 307, respectively, and each actuator is connected to a solenoid valve. In this case, the state of the solenoid valve shown in fig. 4 is a power-off state, and at this time, the fifth control valve 205 is not in communication with the fifth actuator 305, the sixth actuator 306, and the seventh actuator 307.
For example, when the user wants the fifth control valve 205 to control the fifth actuator 305, the switch may be controlled to generate a power-on command for instructing the first solenoid valve 501 to power on, so that the first solenoid valve 501 controls the first solenoid valve 501 to power on after receiving the power-on command for instructing the first solenoid valve 501 to power on, so that the fifth control valve 205 is communicated with the fifth actuator 305, thereby achieving the purpose of the fifth control valve 205 controlling the fifth actuator 305. When the fifth actuator 305 is controlled, the second solenoid valve 502 and the third solenoid valve 503 are both in the power-off state, that is, the fifth control valve 205 is not communicated with the sixth actuator 306 and the seventh actuator 307.
For another example, when the user wants the fifth control valve 205 to control the seventh actuator 307, the switch may be controlled to generate a power-on command for instructing the third solenoid valve 503 to power on, so that after the third solenoid valve 501 receives the power-on command for instructing the third solenoid valve 503 to power on, the third solenoid valve 501 is controlled to power on, so that the fifth control valve 205 is communicated with the seventh actuator 307, thereby achieving the purpose that the fifth control valve 205 controls the seventh actuator 305. In controlling the seventh actuator 307, the first solenoid valve 501 and the second solenoid valve 502 are both in the power-off state, that is, the fifth control valve 205 is not communicated with the fifth actuator 305 and the sixth actuator 306.
In still another embodiment, the position switching mechanism includes 2n solenoid valves; wherein, the oil inlet end and the oil return end of each executing mechanism in the n executing mechanisms are respectively connected with the target control valve through an electromagnetic valve. Illustratively, fig. 5 is a schematic diagram illustrating another boom hydraulic system according to an exemplary embodiment. As shown in fig. 5, if n is 3, the switching mechanism includes six solenoid valves, wherein the oil inlet and the oil return of the fifth actuator 305 are connected to the fifth control valve 205 via a first solenoid valve 501 and a second solenoid valve 502, respectively, the oil inlet and the oil return of the sixth actuator 306 are connected to the fifth control valve 205 via a third solenoid valve 503 and a fourth solenoid valve 504, respectively, and the oil inlet and the oil return of the seventh actuator 307 are connected to the fifth control valve 205 via a fifth solenoid valve 505 and a sixth solenoid valve 506, respectively.
It should be noted that the solenoid valve states shown in fig. 5 are all power-off states, and at this time, the fifth control valve 205 is not communicated with the fifth actuator 305, the sixth actuator 306 and the seventh actuator 307. When a certain actuating mechanism needs to be controlled, two electromagnetic valves connected with the actuating mechanism are controlled to be electrified. The specific embodiments are as described above and will not be described herein.
By adopting the technical scheme, the purpose of controlling a plurality of actuating mechanisms by using one control valve can be realized by adding the electromagnetic valve, and the cost of the boom hydraulic system is reduced. And the electromagnetic valve is a common switch reversing valve, the structure is simple and easy to maintain, the failure rate is low, and the structure of the boom hydraulic system is further simplified.
In addition, in order to prevent the boom from acting due to its own weight, in the present disclosure, the boom hydraulic system 20 may further include balance valves, where the number of the balance valves is the same as the number of the actuators, and the balance valves are N. Each balance valve is connected with an actuating mechanism and used for balancing the load of the actuating mechanism so as to prevent the arm support from acting due to self weight. For example, in fig. 2-5, each actuator is connected to the control valve through a balancing valve. For example, the first implement configuration 301 is coupled to the first control valve 201 via a first balancing valve 401, the second implement configuration 302 is coupled to the second control valve 202 via a second balancing valve 402, … …, the fifth implement configuration 305 is coupled to the fifth control valve 205 via a fifth balancing valve 405, the sixth implement configuration 306 is coupled to the fifth control valve 205 via a sixth balancing valve 406, and, in fig. 5, the seventh implement configuration 307 is coupled to the fifth control valve 206 via a seventh balancing valve 407.
Based on the same invention concept, the disclosure also provides a concrete pump truck, and the concrete pump truck is provided with the boom hydraulic system provided by the disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A boom hydraulic system is characterized by comprising: the system comprises an oil pump, an arm frame multi-way valve and an actuating mechanism;
the oil pump is connected with each control valve in the arm frame multi-way valve and used for pumping hydraulic oil to each control valve;
at least one target control valve in the arm frame multi-way valve is connected with the N executing mechanisms, the target control valve is used for controlling the target executing mechanism corresponding to an operation instruction input by a user to execute corresponding action under the action of hydraulic oil, wherein N is more than or equal to 2 and less than N, and N is the total number of the executing mechanisms.
2. The boom hydraulic system of claim 1, further comprising: the number of the position switching mechanisms is the same as that of the target control valves, wherein the ith target control valve is connected with the n executing mechanisms through the ith position switching mechanism, the value range of i is 1-M, and M is the number of the target control valves;
the position switching mechanism can respond to the operation instruction, and the target control valve connected with the position switching mechanism is controlled to be communicated with the target execution mechanism, so that the target control valve controls the target execution mechanism to execute corresponding actions.
3. The boom hydraulic system of claim 2, wherein the position switching mechanism is a solenoid valve and/or a hydraulic valve.
4. The boom hydraulic system of claim 2, wherein n-2, each of the position switching mechanisms comprises a first solenoid valve and a second solenoid valve; the oil inlet ends of a first executing mechanism and a second executing mechanism which are connected with the target control valve are connected with a first electromagnetic valve, and the oil return ends of the first executing mechanism and the second executing mechanism are connected with a second electromagnetic valve;
when the operation instruction is a power-off instruction, the target execution mechanism is the first execution mechanism, and when the operation instruction is a power-on instruction, the target execution mechanism is the second execution mechanism.
5. The boom hydraulic system according to claim 2, wherein each of the position switching mechanisms comprises n solenoid valves; each of the n actuators is connected to the target control valve via an electromagnetic valve.
6. The boom hydraulic system according to claim 2, wherein each of the position switching mechanisms comprises 2n solenoid valves; and the oil inlet end and the oil return end of each of the n executing mechanisms are respectively connected with the target control valve through an electromagnetic valve.
7. The boom hydraulic system according to any one of claims 1-6, further comprising: the number of the balance valves is N;
each balance valve is connected with one actuating mechanism and used for balancing the load of the actuating mechanism.
8. The boom hydraulic system according to any one of claims 1-6, further comprising: a switch;
the switch is used for generating the operation instruction according to user operation.
9. The boom hydraulic system according to any one of claims 1-6, wherein the actuator is a hydraulic ram or a hydraulic motor.
10. A concrete pump truck characterized in that the concrete pump truck is provided with a boom hydraulic system according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011003485.1A CN112302346A (en) | 2020-09-22 | 2020-09-22 | Boom hydraulic system and concrete pump truck |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011003485.1A CN112302346A (en) | 2020-09-22 | 2020-09-22 | Boom hydraulic system and concrete pump truck |
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| CN110723674A (en) * | 2019-09-19 | 2020-01-24 | 中联重科股份有限公司 | Hydraulic control loop for free hook-falling winch and hoisting device |
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Application publication date: 20210202 |