Pump truck arm support digital multi-way valve

Abstract

The utility model relates to the technical field of hydraulic control, in particular to a pump truck arm support digital multi-way valve, which comprises an oil inlet connector, a reversing connector, a tail connector, a digital controller and a way valve reversing valve plate, a plurality of groups of studs are mounted on the oil inlet connector, an LS pressure relief valve is mounted at one end of the oil inlet connector, and the tail connector is mounted at the other end of the oil inlet connector. A bus temperature sensor and a bus pressure sensor are installed at one end of the tail link, and a manual reversing mechanism is installed at one end of the digital controller. Bus digital control can be achieved through electronic elements such as the integrated digital controller and the sensor, influences caused by factors such as valve element pressure, oil viscosity and pilot pressure can be detected and compensated in real time, system delay can be reduced, system control precision can be improved, and the service life of the system is prolonged. Meanwhile, electronic elements integrated in the system form a multi-way valve safety detection system, and the functions of fault detection, direction indication, LED lamp display and the like can be provided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control, in particular to a digital multi-way valve for a pump truck arm. Background Art

[0002] With the continuous development of urban construction in my country, the boom of pump trucks exceeds 60 meters, and the requirements for pump truck control accuracy and intelligence are getting higher and higher. The traditional proportional multi-way valve can no longer meet the requirements of pump trucks for high-precision control and intelligent control.

[0003] The digital multi-way valve is the core hydraulic control component in the hydraulic system of the cement pump truck boom, which is used to manipulate and control the movement of various components. The existing bus proportional multi-way valve usually adopts a proportional pressure reducing multi-way valve. The control of the working link of each multi-way valve is to control the action of the main valve through two proportional pressure reducing valves in each link, thereby further controlling the action of each component. Although this proportional valve plate solves the program control problem of the working parts of the pump truck boom, its performance is affected by the proportional pressure reducing valve, and the long response time and large hysteresis loop lead to limited control accuracy. Moreover, the solenoid power of this structure multi-way valve is large, the heat is large, and the heat dissipation is difficult. The internal control components such as sensors and circuit boards will work at high temperatures for a long time, and the failure rate is very high. Utility Model Content

[0004] The purpose of the utility model is to provide a digital multi-way valve for a pump truck boom, so as to solve the problems in the above-mentioned background technology that the multi-way valve electromagnet has high power, generates high heat, is difficult to dissipate heat, and the internal control components such as sensors and circuit boards will work at high temperatures for a long time, resulting in a high failure rate.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The digital multi-way valve of the pump truck arm frame includes an oil inlet link, a reversing link, a tail link, a digital controller and a reversing valve plate of a circuit valve. The oil inlet link is installed with several groups of studs, one end of the oil inlet link is installed with an LS pressure relief valve, one end of the tail link is installed with a bus temperature sensor and a bus pressure sensor, and one end of the digital controller is installed with a manual reversing mechanism;

[0007] The manual reversing mechanism comprises a reversing valve body, a reversing valve core and an electrical component, and a return spring is installed on the reversing valve core.

[0008] Preferably, a CAN bus pressure sensor and a CAN bus temperature sensor are integrated on the tail connector.

[0009] Preferably, the path valve reversing valve plate is formed by a plurality of reversing links connected in parallel and the reversing is controlled by a digital controller.

[0010] Preferably, the number of the reversing links is at least 9.

[0011] Preferably, each of the digital controllers is integrated into an independent unit by an LVDT displacement sensor, two normally closed high-speed switching valves, two normally open high-speed switching valves, and electrical components.

[0012] Preferably, the electrical components include a circuit board, a shield, and an indicator light.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The digital multi-way valve of the pump truck boom can realize bus digital control through integrated digital controllers, sensors and other electronic components, and detect and compensate for the influence of valve core pressure, oil viscosity, pilot pressure and other factors in real time, which can reduce system hysteresis and improve system control accuracy. At the same time, the electronic components integrated in the system constitute a multi-way valve safety detection system, which can provide functions such as fault detection, direction indication, and LED light display.

[0015] The digital multi-way valve of the pump truck boom has a compact structure and reliable functions. It can not only accurately control the retraction and extension of the pump truck boom, the steering of the operating table and other routine operations, but also the multi-way valve has a good digital control system and a fast response speed, which is conducive to automatic control command operations such as horizontal translation and vertical translation at the end of the pump truck. It has high control accuracy, good boom stability, and small end swing amplitude; the multi-way valve has obvious energy-saving effect. The multi-way valve uses a high-speed switching valve control with low control pressure and low standby pressure of the hydraulic system. Compared with the proportional pressure reducing valve control system, it is more energy-saving, and at the same time, the control current is small, the control heat dissipation requirements are low, and the operation is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, further detailed explanation is provided, but the accompanying drawings do not constitute a limitation to the present invention.

[0017] Figure 1 This is a schematic diagram of the structure of the digital multi-way valve of the pump truck arm support of the utility model;

[0018] Figure 2 This is the circuit control principle diagram of the digital multi-way valve of the pump truck arm support of the utility model;

[0019] Figure 3 This utility model Figure 2 A partial enlarged diagram of the structure of the circuit control principle;

[0020] Figure 4 It is a structural schematic diagram of the arm support multi-way valve reversing link of the utility model;

[0021] Figure 5 It is a control principle schematic diagram of the digital control of the utility model.

[0022] The meaning of the symbols in the figure:

[0023] 1-Oil inlet connection, 2-Stud, 3-Reversing connection, 4-Tail connection, 5-Digital controller, 6-LS pressure relief valve, 7-Manual reversing mechanism, 8-Bus temperature sensor, 9-Bus pressure sensor, 10-Reversing valve body, 11-Reversing valve core, 12-Reset spring, 13-Electrical component, 14-Normally closed high-speed switching valve, 15-Normally open high-speed switching valve, 16-LVDT displacement sensor. DETAILED DESCRIPTION

[0024] The following will combine the embodiments of the utility model and the drawings of the specification to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be understood that the terms "center", "vertical", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] Pump truck arm digital multi-way valve, such as Figure 1-Figure 5As shown, it includes an oil inlet link 1, a reversing link 3, a tail link 4, a digital controller 5 and a circuit valve reversing valve plate. Several groups of studs 2 are installed on the oil inlet link 1. An LS pressure relief valve 6 is installed at one end of the oil inlet link 1. A bus temperature sensor 8 and a bus pressure sensor 9 are installed at one end of the tail link 4. A manual reversing mechanism 7 is installed at one end of the digital controller 5. The manual reversing mechanism 7 includes a reversing valve body 10, a reversing valve core 11 and an electrical component 13. A reset spring 12 is installed on the reversing valve core 11. Bus digital control can be realized through integrated digital controllers and electronic components such as sensors, and the effects of valve core pressure, oil viscosity, pilot pressure and other factors can be detected and compensated in real time, which can reduce system hysteresis and improve system control. Precision, at the same time, the electronic components integrated in the system constitute the multi-way valve safety detection system, which can provide functions such as fault detection, direction indication, LED light display, etc., in addition, it has a compact structure and reliable functions. It can not only accurately control the retraction and extension of the pump truck arm, the steering of the operating table and other routine operations, but also the multi-way valve has a good digital control system and a fast response speed, which is conducive to the automatic control command operations such as horizontal translation and vertical translation at the end of the pump truck. It has high control accuracy, good boom stability, and small end swing amplitude; the multi-way valve has obvious energy-saving effect. The multi-way valve is controlled by a high-speed switching valve, with low control pressure and low standby pressure of the hydraulic system. Compared with the proportional pressure reducing valve control system, it is more energy-saving, and at the same time, the control current is small, the control heat dissipation requirements are low, and the operation is more reliable.

[0027] Furthermore, the tail link 4 is integrated with a CAN bus pressure sensor 9 and a CAN bus temperature sensor 8 to detect the system temperature and P port pressure respectively. The control system uses this to make compensation modulation on the control signal. At the same time, it is used as a system safety detection signal and fed back to the operator through the bus signal. If the oil temperature is too high, an alarm signal will be issued.

[0028] Specifically, the reversing valve plate of the circuit valve is formed by connecting a plurality of reversing links 3 in parallel, and the reversing is controlled by a digital controller 5 .

[0029] It is worth noting that the number of the reversing links 3 is at least 9 groups.

[0030] In addition, each digital controller 5 is integrated into an independent unit by LVDT displacement sensor 16, 2 normally closed high-speed switch valves 14, 2 normally open high-speed switch valves 15, and electrical components 13. The electrical components 13 include circuit boards, shields, and indicator lights. The digital controller is based on the PWM control principle. The input digital signal (input value) determines the control pressure of the main valve core. The control pressure is opened and closed at high frequency through the 4 high-speed switch valves in the controller, and the pulse flow is output to achieve the matched control pressure. The LVDT displacement sensor detects the displacement of the main core, and the modulation circuit generates a feedback signal. The electronic control system controls the high-speed switch valve according to the deviation between the set signal and the feedback signal, and then changes the pilot pressure to drive the valve core to the correct position. When the valve core reaches the set position, the modulation stops automatically, and the position of the valve core is locked. Different reversing links are directly connected and controlled through the bus. Through the matching closed-loop control program, digital programming control of the multi-way valve can be realized.

[0031] The working principle of the digital multi-way valve of the pump truck arm: the multi-way valve reversing valve plate is composed of 9 groups (but not limited to 9 groups) of reversing links connected in parallel and the reversing is controlled by a digital controller. The structure is as follows Figure 3 As shown, the control principle is as follows Figure 4 As shown. The controller is integrated into an independent unit by LVDT displacement sensor 16, 2 normally closed high-speed switch valves 14, 2 normally open high-speed switch valves 15, electrical components 13 and other components, and is directly connected to the valve body of the reversing link. The electrical component 13 includes circuit boards, shields, indicator lights and other components. The controller is based on the PWM control principle. The input digital signal (input value) determines the control pressure of the main valve core. The control pressure is opened and closed at high frequency through the 4 high-speed switch valves in the controller, and the pulse flow is output to achieve the matched control pressure. The LVDT displacement sensor detects the displacement of the main core, and the modulation circuit generates a feedback signal. The electronic control system controls the high-speed switch valve according to the deviation between the set signal and the feedback signal, and then changes the pilot pressure to drive the valve core to the correct position. When the valve core reaches the set position, the modulation stops automatically and the position of the valve core is locked. Different reversing links are directly connected and controlled through the bus. Through the matching closed-loop control program, digital programming control of the multi-way valve can be realized.

[0032] The tail link integrates the CAN bus pressure sensor and CAN bus temperature sensor to detect the system temperature and P port pressure respectively. The control system uses this to make compensation modulation on the control signal. At the same time, it is used as a system safety detection signal and fed back to the operator through the bus signal. If the oil temperature is too high, an alarm signal will be issued.

[0033] The integrated digital controller, sensors and other electronic components can realize bus digital control, detect and compensate for the influence of valve core pressure, oil viscosity, pilot pressure and other factors in real time, reduce system hysteresis and improve system control accuracy. At the same time, the electronic components integrated in the system constitute a multi-way valve safety detection system, which can provide fault detection, direction indication, LED light display and other functions.

[0034] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. The digital multi-way valve of the pump truck arm is characterized by: It comprises an oil inlet link (1), a reversing link (3), a tail link (4), a digital controller (5) and a reversing valve plate of a circuit valve, wherein a plurality of groups of studs (2) are installed on the oil inlet link (1), an LS pressure relief valve (6) is installed on one end of the oil inlet link (1), a bus temperature sensor (8) and a bus pressure sensor (9) are installed on one end of the tail link (4), and a manual reversing mechanism (7) is installed on one end of the digital controller (5); The manual reversing mechanism (7) comprises a reversing valve body (10), a reversing valve core (11) and an electrical component (13); a return spring (12) is mounted on the reversing valve core (11).

2. The pump truck arm support digital multi-way valve according to claim 1, characterized in that: The tail link (4) is integrated with a CAN bus pressure sensor (9) and a CAN bus temperature sensor (8).

3. The pump truck arm support digital multi-way valve according to claim 1, characterized in that: The path valve reversing valve plate is formed by connecting a plurality of reversing links (3) in parallel, and the reversing is controlled by a digital controller (5).

4. The pump truck arm support digital multi-way valve according to claim 3 is characterized in that: The number of the reversing links (3) is at least 9.

5. The pump truck arm support digital multi-way valve according to claim 1, characterized in that: Each of the digital controllers (5) is integrated into an independent unit by means of an LVDT displacement sensor (16), two normally closed high-speed switch valves (14), two normally open high-speed switch valves (15), and an electrical element (13).

6. The pump truck arm support digital multi-way valve according to claim 5, characterized in that: The electrical component (13) comprises a circuit board, a shield, and an indicator light.

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