WO2013013397A1 - Dispositif de tension et machinerie mobile chenillée équipée du dispositif de tension - Google Patents

Dispositif de tension et machinerie mobile chenillée équipée du dispositif de tension Download PDF

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Publication number
WO2013013397A1
WO2013013397A1 PCT/CN2011/077681 CN2011077681W WO2013013397A1 WO 2013013397 A1 WO2013013397 A1 WO 2013013397A1 CN 2011077681 W CN2011077681 W CN 2011077681W WO 2013013397 A1 WO2013013397 A1 WO 2013013397A1
Authority
WO
WIPO (PCT)
Prior art keywords
tensioning device
oil passage
valve
controller
hydraulic cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2011/077681
Other languages
English (en)
Chinese (zh)
Inventor
余林
龚敬
许辉
赵岳
贺劲
苏竹新
罗海斌
彭志威
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Zoomlion Special Vehicle Co Ltd
Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd
Original Assignee
Hunan Zoomlion Special Vehicle Co Ltd
Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan Zoomlion Special Vehicle Co Ltd, Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd filed Critical Hunan Zoomlion Special Vehicle Co Ltd
Priority to PCT/CN2011/077681 priority Critical patent/WO2013013397A1/fr
Publication of WO2013013397A1 publication Critical patent/WO2013013397A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/30—Track-tensioning means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action ; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action ; Circuits therefor with only one servomotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/30515—Load holding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members

Definitions

  • the present invention relates to the field of construction machinery, and in particular to a tensioning device and a crawler type traveling machine having the same.
  • a tensioning device for tensioning the crawler belt is used to adjust the degree of tightness of the crawler belt, and the performance of the crawler directly affects the running performance of the traveling machine.
  • the hydraulic tensioning device is a tensioning device commonly used in current crawler traveling machines.
  • the hydraulic tensioning device usually includes a hydraulic cylinder, a guide frame and a guide wheel, and a guide wheel located inside the crawler belt is mounted on the guide frame through a bearing.
  • the piston rod of the hydraulic cylinder acts on the guide frame (the piston rod can be connected to the guide frame, or can only be in contact with the guide frame to be placed on the guide frame), by charging the rodless cavity of the hydraulic cylinder
  • the piston rod of the hydraulic cylinder drives the guide frame and the guide wheel to move toward the track, thereby tensioning the track.
  • the hydraulic cylinder shut-off valve is manually connected to the hydraulic source through the connecting pipe when the crawler belt needs to be tensioned, and after the tension is applied to the predetermined pressure, the connecting pipe is manually removed.
  • the cylinder is held in pressure by, for example, a shut-off valve to maintain the track at a predetermined tensioning pressure.
  • the existing hydraulic tensioning device is inconvenient for the charging operation and the pressure relief operation.
  • the inconvenient pressure relief operation may cause the traveling machinery not to be relieved when not in use for a long time, so that the bearing of the guide wheel The track and the track are subjected to tension for a long time, which shortens the life of the bearing and the track.
  • An object of the present invention is to provide a tensioning device and a crawler type traveling machine having the same, which are convenient for both the charging operation and the pressure releasing operation, and can extend the life of the tensioning device and the crawler.
  • the present invention provides a tensioning device including a hydraulic cylinder, wherein the tensioning device further includes a main valve and a first control valve; Communicating with the rod chamber and the rodless chamber of the hydraulic cylinder to control the hydraulic cylinder to be in a pressurized state or a pressure maintaining state; between the rodless chamber of the hydraulic cylinder and the working oil port of the main valve A first oil passage communicating with the oil tank is connected to the pipeline, and the first control valve is serially connected to the first oil passage to control the first oil passage to be turned on or off.
  • the tensioning device further includes a second oil passage connected in parallel with the first oil passage, and the second oil passage is connected in series with a second control valve to control the second oil passage to be turned on or off.
  • An overflow valve is also connected in series on the second oil road.
  • the second oil passages are plural, and the overflow values of the overflow valves on the respective second oil passages are different from each other.
  • the tensioning device further comprises an accumulator in communication with the rodless cavity of the hydraulic cylinder.
  • the tensioning device further includes a controller electrically coupled to the main valve, the first control valve, and the second control valve.
  • the tensioning device further includes a pressure sensor in communication with the rodless chamber of the hydraulic cylinder, the pressure sensor being coupled to the controller.
  • the main valve and/or the first control valve is an electromagnetic reversing valve, and a check valve is connected in series between the working port of the main valve and the rodless cavity, the single The valve allows hydraulic oil to flow from the working port of the main valve to the rodless chamber.
  • the tensioning device further includes a guide frame and a guide wheel, the piston rod of the hydraulic cylinder is in contact with or connected to one end of the guide frame, and the other end of the guide frame is mounted on the guide wheel.
  • the present invention also provides a crawler type traveling machine, wherein the crawler traveling machine comprises the above-described tensioning device for tensioning a crawler of the traveling machine.
  • the present invention also provides a crawler type walking machine, the crawler type walking machine A tensioning device for tensioning a crawler belt of the traveling machine, the tensioning device including a hydraulic cylinder, wherein the tensioning device further includes a main valve, a first control valve, and a controller; Two working oil ports respectively communicate with the rod chamber and the rodless chamber of the hydraulic cylinder to control the hydraulic cylinder to be in a pressurized state or a pressure maintaining state; the rodless chamber of the hydraulic cylinder and the main valve a first oil passage communicating with the oil tank is connected to the pipeline between the working oil ports, and the first control valve is serially connected to the first oil passage to control the first oil passage to be turned on or off; the controller Connecting with the main valve and the first control valve, when the traveling machine is stopped, the controller controls the first control valve to turn on the first oil passage, when the traveling machine is started, The controller controls the first control valve to shut off the first oil passage.
  • the controller controls the main valve to keep the hydraulic cylinder in a pressure holding state; when the traveling machine is started, the controller controls the main valve to make The hydraulic cylinder is in a pressurized state.
  • the tensioning device further includes a second oil passage connected in parallel with the first oil passage, and the second oil passage is connected in series with a second control valve to control the second oil passage to be turned on or off.
  • An overflow valve is also connected in series on the second oil passage, the second control valve is connected to the controller; when the running device is started, the controller controls the second control valve to make the second oil The road is turned on.
  • the tensioning device further includes a pressure sensor in communication with the rodless cavity of the hydraulic cylinder, the pressure sensor being coupled to the controller to transmit a signal representative of the detected pressure value of the rodless cavity
  • the controller when the running device is activated, the controller also compares a pressure value of the rodless chamber of the hydraulic cylinder and an overflow value of the overflow valve, when the pressure of the rodless chamber
  • the controller controls the main valve to bring the hydraulic cylinder into a charging state, and controls the second control valve to cause the second oil guiding
  • the controller controls the main valve to put the hydraulic cylinder in a pressure holding state, and controls the second control a valve to cut the second oil passage.
  • the control The controller locks and issues an alarm.
  • the controller when the pressure value of the rodless chamber is less than the overflow value of the overflow valve, the controller further calculates a tensioning time of the tensioning device, when the tensioning time exceeds a predetermined time The controller locks and issues an alarm when the pressure value of the rodless chamber has not reached the overflow value of the relief valve.
  • the tensioning device further includes a speed detecting device for detecting a walking speed of the traveling machine, the speed detecting device being coupled to the controller to represent a signal of the detected walking speed of the traveling machine Sending to the controller;
  • the second oil passage is a plurality of, the overflow values of the overflow valves on the second oil passages are different from each other, and each overflow value corresponds to a walking speed interval
  • the controller controls a second control valve of one of the second oil passages to turn on the second oil passage according to the traveling speed of the traveling machine, and the overflow valve in the second oil passage
  • the overflow value corresponds to the running speed interval in which the traveling speed is located, and controls the second control valve on the other second oil passage to cut the other second oil passage.
  • the speed detecting means is a sensor for detecting an engine speed of the traveling machine.
  • the tensioning device when the tensioning device needs to be pressurized, only the main valve is controlled to be in a state of being pressurized, and the first oil passage is controlled by the first control valve, which can be realized;
  • the device When the device is relieved of pressure, it is only necessary to control the conduction of the first oil passage through the first control valve, so that the charging operation and the pressure relief operation of the tensioning device are convenient, and the tensioning device can be extended or even have the tensioning device.
  • the life of the track of the crawler-type traveling machine of the device when the tensioning device needs to be pressurized, only the main valve is controlled to be in a state of being pressurized, and the first oil passage is controlled by the first control valve, which can be realized;
  • Figure 1 is a schematic schematic view of a tensioning device in accordance with a preferred embodiment of the present invention
  • Figure 2 is a schematic control block diagram of a tracked walking machine in accordance with a preferred embodiment of the present invention.
  • a tensioning device includes a hydraulic cylinder 1, wherein the tensioning device further includes a main valve 2 and a first control valve 3;
  • the two working oil ports of the main valve 2 are respectively connected with the rod chamber and the rodless chamber of the hydraulic cylinder 1 to control the hydraulic cylinder 1 to be in a pressurized state or a pressure maintaining state;
  • a first oil passage communicating with the oil tank is bypassed on the pipeline between the rodless chamber and the working oil port of the main valve 2, and the first control valve 3 is serially connected to the first oil passage to control the first
  • the oil circuit is turned on or off.
  • the tensioning device may further include a second oil passage connected in parallel with the first oil passage, and the second oil passage is connected in series with a second control valve 5 to control the second oil.
  • the road is turned on or off, and a relief valve 6 is also connected in series to the second oil passage. Therefore, when the tensioning device is pressurized, the second oil passage is controlled by the second control valve 5, so that the hydraulic cylinder 1 can be made to overflow the overflow valve 6 of the second oil passage (overflow pressure).
  • the pressure is applied so that the pressure in the rodless chamber of the hydraulic cylinder 1 can be conveniently and accurately controlled, that is, the tension of the tensioning device can be conveniently and accurately controlled.
  • the second oil passage may be a plurality of strips, and the overflow values of the overflow valves 6 on the respective second oil passages are different from each other. Therefore, one of the corresponding second oil passages can be selected according to the specific working condition of the tensioning device in use, and the overflow pressure of the overflow valve 6 on the second oil passage is opposite to the rodless cavity of the hydraulic cylinder 1. The pressure is applied so that the tensioning device has a tensioning force adapted to the working condition. As shown in FIG. 1, the second oil passages are two.
  • the tensioning device may further comprise an accumulator 8 in communication with the rodless chamber of the hydraulic cylinder 1.
  • the accumulator 8 acts as a buffer to further enhance the life of the track.
  • the control modes of the main valve 2, the first control valve 3, and the second control valve 5 described above are automatically controlled by being connected to the controller 4.
  • the tensioning device may further comprise a pressure sensor 7 in communication with the rodless chamber of the hydraulic cylinder 1, the pressure sensor 7 being coupled to the controller 4. Therefore, the controller 4 can automatically control the main valve 2 and the second control valve 5 according to the pressure in the rodless chamber of the hydraulic cylinder 1 (ie, the tensioning force of the tensioning device) (for specific control methods, for example, reference can be made. More detailed description below).
  • the above-mentioned main valve 2, the first control valve 3 and the second control valve 5 can also be controlled according to specific working conditions without passing through the controller 4 but by other means (for example, manual mode).
  • the main valve 2 can be realized by various suitable types of valves, for example, as shown in FIG. 1, the main valve 2 can be an electromagnetic reversing valve, the working oil port of the main valve 2 and the rodless cavity.
  • a check valve 9 is connected in series between the lines, and the check valve 9 allows hydraulic oil to flow from the working port of the main valve 2 to the rodless chamber.
  • the control port of the electromagnetic directional control valve is connected to the controller 4. More specifically, the main valve 2 It can be a three-position four-way electromagnetic reversing valve. When the main valve 2 is in the neutral position (the electromagnets Y1 and Y2 on both sides of the main valve 2 are de-energized), the hydraulic cylinder 1 is in the pressure holding state, when the main valve 2 is in the right position.
  • the electromagnet Y2 of the main valve 2 is energized
  • the hydraulic cylinder 1 is in a pressurized state.
  • the left position of the main valve 2 (the electromagnet Y1 of the main valve 2 is energized) can be used under maintenance conditions, and the check valve 9 can be a hydraulically controlled check valve, as shown in Fig. 1, the hydraulic control
  • the control port of the check valve 9 is connected to the line between the working port of the main valve 2 and the rod chamber of the hydraulic cylinder 1, so that when the main valve 2 is in the left position, the check valve 9 is reversely guided, allowing hydraulic pressure
  • the oil flows from the rodless chamber of the hydraulic cylinder 1 to the working port of the main valve 2.
  • the one-way valve 9 can be replaced with a balancing valve or other hydraulic logic valve.
  • the first control valve 3 and the second control valve 5 can also be realized by various suitable types of valves, such as the electromagnetic reversing valve shown in FIG. 1, and more specifically, the two-position two-way electromagnetic reversing The valve, when the electromagnet Y3 of the first control valve 3 is energized, the first oil passage is cut, and when the electromagnet Y3 of the first control valve 3 is de-energized, the first oil passage is turned on. When the electromagnets Y4 and ⁇ 5 of the second control valve 5 on the second oil passage are energized, the second oil passage is turned on, and when the electromagnets ⁇ 4 and ⁇ 5 are de-energized, the second oil passage is cut.
  • the first control valve 3 and the second control valve 5 may also be other suitable valves such as a shut-off valve.
  • an overflow main valve 20 may be bypassed to the oil supply line of the main valve 2, thereby preventing the hydraulic system of the tensioning device from being subjected to excessive pressure and causing malfunction of the application equipment.
  • the tensioning device can be mounted to an application device (e.g., a tracked walking machine) in a variety of ways.
  • the tensioning device may further include a guide frame and a guide wheel (not shown), and the piston rod of the hydraulic cylinder 1 is in contact with or connected to one end of the guide frame, The other end of the guide frame is mounted (for example by a bearing) on the guide wheel.
  • the mounting is achieved by mounting the guide wheel to the inside of the crawler belt, for example, of a crawler type traveling machine.
  • the piston rod of the hydraulic cylinder drives the guide frame and the guide wheel to move toward the crawler by pressurizing the rodless chamber of the hydraulic cylinder 1, thereby tensioning the crawler belt.
  • the present invention also provides a crawler type walking machine, wherein the crawler walking machine comprises a tensioning device as described above, the tensioning device being used for a crawler of the traveling machine Tightening.
  • the tracked walking machine described in the context of this application may be a variety of machines that travel through the track, including but not limited to construction machines such as pavers, excavators, crawler cranes, and bulldozers.
  • the present invention also provides a crawler type traveling machine including a tensioning device for tensioning a crawler belt of the traveling machine, the tensioning device
  • the hydraulic cylinder 1 is further included, wherein the tensioning device further comprises a main valve 2, a first control valve 3 and a controller 4; the two working ports of the main valve 2 and the rod cavity of the hydraulic cylinder 1 and The rodless chamber is connected to control the hydraulic cylinder 1 to be in a pressurized state or a pressure maintaining state; the pipeline between the rodless chamber of the hydraulic cylinder 1 and the working oil port of the main valve 2 is bypassed with a fuel tank a first oil passage connected, the first control valve 3 is serially connected to the first oil passage to control the first oil passage to be turned on or off; the controller and the main valve 2 and the first control valve 3 Connecting, when the traveling machine is stopped, the controller 4 controls the first control valve 3 to turn on the first oil passage, and when the traveling machine is started, the controller 4 controls the The first control valve 3 is for cutting
  • the automatic control of the first control valve 3 by the controller 4 it is convenient to perform the pressure relief operation of the tensioning device when the traveling machine is stopped.
  • the state of the traveling machine can be judged, for example, by the power (start) or power loss (stop) of the engine of the traveling machine.
  • the controller 4 controls the main valve 2 to put the hydraulic cylinder 1 in a pressure holding state; when the traveling machine is started, the controller 4 controls the The main valve 2 is such that the hydraulic cylinder 1 is in a pressurized state.
  • the tensioning device further includes a second oil passage connected in parallel with the first oil passage, and the second oil passage is connected in series with a second control valve 5 to control the second oil passage.
  • the second oil passage is also connected in series with a relief valve 6, the second control valve 5 is connected to the controller 4; when the running device is started, the controller 4 controls the The second control valve 5 is configured to conduct the second oil passage. Therefore, when the tensioning device is pressurized, the second control valve 5 is controlled by the controller 4 so that the second oil passage is turned on, so that the hydraulic cylinder 1 can be made of the relief valve 6 of the second oil passage.
  • the overflow value (overflow pressure) is pressurized, so that the pressure in the rodless chamber of the hydraulic cylinder 1 can be conveniently and accurately controlled, that is, the tension of the tensioning device can be conveniently and accurately controlled.
  • the tensioning device may further include a pressure sensor 7 communicating with the rodless cavity of the hydraulic cylinder 1, the pressure sensor 7 being connected to the controller 4, and the representative is detected.
  • the signal of the pressure value of the rodless chamber is sent to the controller 4, and when the running device is started, the controller also compares the pressure value of the rodless chamber of the hydraulic cylinder 1 and the overflow
  • the main valve 2 is such that the hydraulic cylinder 1 is in a pressure holding state, and the second control valve 5 is controlled to cut the second oil passage.
  • the pressure in the rodless chamber will be less than or equal to the overflow value of the relief valve 6, but when the traveling machine is in an unconventional state, such as walking on a rough terrain, it may result in a rodless chamber of the hydraulic cylinder 1.
  • the pressure in the overflow valve is greater than the overflow value of the relief valve 6, and the worker is required to manually determine whether interference or other operations are required on the tensioning device. Therefore, preferably, when the pressure value of the rodless chamber is greater than the overflow value of the relief valve 6, the controller 4 locks and issues an alarm.
  • the controller 4 when the pressure value of the rodless chamber is smaller than the overflow value of the relief valve 6, the controller 4 also calculates the tensioning time of the tensioning device when the tensioning time exceeds the predetermined time.
  • the tensioning device may have failed (for example, oil leakage, etc.), and the controller 4 locks and issues an alarm, The staff handles it.
  • the alarm can be issued in various ways, such as by a sound signal, an optical signal, or the like.
  • the tensioning device further includes a speed detecting device for detecting a walking speed of the traveling machine, the speed detecting device being connected to the controller 4 to represent the detected walking speed of the traveling machine.
  • the controller 4 controls the second control valve 5 of one of the second oil passages to turn on the second oil passage according to the traveling speed of the traveling machine, the second The overflow value of the relief valve 6 in the oil passage corresponds to the traveling speed interval in which the traveling speed is located, and controls the second control valve 5 on the other second oil passage to cut off the other second oil passage.
  • one of the corresponding second oil passages can be selected according to the specific working condition of the tensioning device in use, and the overflow pressure of the overflow valve 6 on the second oil passage is opposite to the rodless cavity of the hydraulic cylinder 1.
  • the pressure is applied so that the tensioning device has a tensioning force adapted to the working condition.
  • the speed detecting device may be in various suitable forms and may be detected in various manners.
  • the speed detecting device may be a sensor for detecting the engine speed of the traveling machine, and of course, the speed of the traveling motor may be detected.
  • the sensor can also be a displacement sensor of a traveling machine or the like.
  • the second oil passages are two.
  • the overflow value of the relief valve 6 on one of the second oil passages is P2, and the overflow value P2 can be in the high-speed traveling speed range of the traveling machine (for example, the engine speed is greater than or equal to 800 rpm).
  • the overflow valve 6 of the other second oil passage has an overflow value of P3, which can be adapted to the low speed travel speed range of the traveling machine (for example, the engine speed is less than 800 rpm).
  • the tensioning device can also be provided with more second oil passages, thereby dividing the walking speed of the traveling machine into more corresponding intervals, so that the tensioning device can have more optional tensioning pressures. The tension is tightened to effectively improve the running characteristics of the traveling machine.
  • the controller 4 controls the electromagnet Y3 of the first control valve 3 to lose power (the first oil passage is turned on), the main valve 2 is at the neutral position, and the hydraulic cylinder 1 is in communication with the oil tank, the hydraulic pressure The cylinder 1 is relieved of pressure.
  • the controller 4 controls the electromagnet Y3 of the first control valve 3 to be energized (the first oil circuit is cut off); and when detecting whether the engine speed reaches 800 rpm, there are two cases: 1.
  • the pressure in the rodless chamber of the pressure cylinder 1 and the overflow value P2 of the relief valve 6 are such that if the tensioning pressure is higher than P2, the controller 4 is locked and an alarm is issued when the tensioning pressure is lower than P2.
  • the electromagnet Y2 of the main valve 2 and the electromagnet Y5 of the second control valve 5 are energized, and the system starts to be pressurized.
  • the controller 4 locks and issues an alarm.
  • the system continues to pressurize until the pressure reaches P2.
  • the electromagnet Y2 of the main valve 2 and the electromagnet Y5 of the second control valve 5 are de-energized, and the accumulator 8 starts to hold pressure, and the charging process ends;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention porte sur un dispositif de tension qui comprend un cylindre hydraulique (1), une soupape principale (2) et une première soupape de commande (3). Deux orifices d'huile travaillante de la soupape principale (2) sont en communication avec une chambre de tige et une chambre sans tige du cylindre hydraulique (1) respectivement, pour commander le cylindre hydraulique (1) dans un état d'accroissement de la pression ou dans un état de maintien de la pression. Une première conduite d'huile en communication avec un réservoir d'huile est branchée sur une conduite située entre la chambre sans tige du cylindre hydraulique (1) et un orifice d'huile de travail de la soupape principale (2). La première soupape de commande (3) est connectée en série à la première conduite d'huile pour commander la première conduite d'huile de façon à ce qu'elle soit en circuit ou coupée. L'invention porte aussi sur une machinerie mobile chenillée qui comprend le dispositif de tension. Au moyen de la solution technique, l'opération d'accroissement de la pression et l'opération de relâchement de la pression du dispositif de tension deviennent toutes les deux commodes et la durée de vie du dispositif de tension et aussi de la piste de la machinerie mobile chenillée possédant le dispositif de tension peut être allongée.
PCT/CN2011/077681 2011-07-27 2011-07-27 Dispositif de tension et machinerie mobile chenillée équipée du dispositif de tension Ceased WO2013013397A1 (fr)

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PCT/CN2011/077681 WO2013013397A1 (fr) 2011-07-27 2011-07-27 Dispositif de tension et machinerie mobile chenillée équipée du dispositif de tension

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PCT/CN2011/077681 WO2013013397A1 (fr) 2011-07-27 2011-07-27 Dispositif de tension et machinerie mobile chenillée équipée du dispositif de tension

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108278229A (zh) * 2018-03-19 2018-07-13 湖南星邦重工有限公司 一种曲臂式高空作业车连接体调平液压系统
CN117627975A (zh) * 2023-11-22 2024-03-01 上海中联重科桩工机械有限公司 工程机械液压回路、履带纠偏装置及履带纠偏方法

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