WO2015107868A1 - 油圧アクチュエータの速度制御装置 - Google Patents

油圧アクチュエータの速度制御装置 Download PDF

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Publication number
WO2015107868A1
WO2015107868A1 PCT/JP2015/000009 JP2015000009W WO2015107868A1 WO 2015107868 A1 WO2015107868 A1 WO 2015107868A1 JP 2015000009 W JP2015000009 W JP 2015000009W WO 2015107868 A1 WO2015107868 A1 WO 2015107868A1
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WO
WIPO (PCT)
Prior art keywords
cam
speed
normal
hydraulic actuator
hydraulic
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/JP2015/000009
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English (en)
French (fr)
Japanese (ja)
Inventor
雅士 渥美
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.)
Tadano Ltd
Original Assignee
Tadano 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 Tadano Ltd filed Critical Tadano Ltd
Priority to CN201580003011.8A priority Critical patent/CN105814296B/zh
Priority to KR1020167015890A priority patent/KR101800718B1/ko
Publication of WO2015107868A1 publication Critical patent/WO2015107868A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/04—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/20—Control systems or devices for non-electric drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/54—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/04—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by mechanical control linkages

Definitions

  • the present invention relates to a hydraulic actuator speed control device. More particularly, the present invention relates to an apparatus for controlling the speed of an actuator for a work machine that operates a hydraulic actuator with a hydraulic pump and drives the hydraulic pump with an engine.
  • the present invention can be applied to any industrial actuator as long as it is a working machine using a hydraulic actuator as described above.
  • the speed control of the hydraulic actuator is performed by controlling two elements of the valve opening amount of the hydraulic actuator control valve and the engine speed for rotating the hydraulic pump. Yes.
  • Patent Document 1 the conventional technique of Patent Document 1 has been proposed.
  • the valve operating lever is moved forward and backward in the axial direction with respect to the accelerator operating link of the engine, and the engaging position between the engaging portion and the engaging receiving portion is changed.
  • the accelerator operating link can be operated with a delay, even if the valve operating lever is moved to the end position.
  • the upper limit of the engine speed can be limited. That is, the engine speed can be switched between high and low.
  • the above prior art uses a structure for changing the insertion length of the shaft and the cylindrical portion and a mechanism for changing the engagement position between the engagement portion and the engagement receiving portion around the shaft, and is incorporated in the link mechanism. It's a complicated structure. For this reason, there is a problem that troubles are likely to occur, and handling is troublesome in that the amount of play between the engagement portion and the engagement receiving portion must be adjusted manually.
  • an object of the present invention is to provide a hydraulic actuator speed control device that is capable of switching between high and low speeds of a hydraulic actuator and that is simple and hardly causes failure. It is another object of the present invention to provide a speed control device for a hydraulic actuator that uses a simple manual device and can perform speed control at a low cost.
  • a hydraulic actuator speed control apparatus comprising: a control valve that controls an operating speed of the hydraulic actuator in a working machine that operates a hydraulic actuator for a working machine with a hydraulic pump and drives the hydraulic pump with an engine; A rotation speed controller for increasing / decreasing the rotation speed of the engine, a manual operation lever for directly controlling a pressure oil switching direction and a valve opening degree in the control valve, and a movement of the operation lever are transmitted to the rotation speed controller.
  • a cam device comprising a cam and a cam follower, the cam device comprising: a high-speed cam that moves the cam follower small; a normal cam that moves the cam follower large; the high-speed cam; and the normal cam
  • the cam surface of the high speed cam or the normal cam is in a position where one of them is pushed out. Characterized in that comprising a position fixing mechanism is fixed at the operating position to move the serial cam follower.
  • the speed control device for a hydraulic actuator according to a second aspect of the present invention is the speed control device for the hydraulic actuator according to the first aspect, wherein the high speed cam is fixed to a base end portion of the operation lever, and the normal cam is the high speed cam.
  • the position fixing mechanism is a two-position holding notch that can hold the position at the forward position and the backward position of the normal cam.
  • the hydraulic actuator is a high / low speed variable motor, and the high speed / low speed variable motor has a high / low speed mode for the high speed cam or the normal cam. It is characterized in that a switch actuator for operating a changeover switch for switching between the two is provided.
  • the hydraulic actuator speed control device is the speed control device for the hydraulic actuator according to the third aspect, wherein the switch actuator is a push piece formed on the normal cam, and the change-over switch is located when the normal cam is in the operating position. It is the thing which operates.
  • a speed control device for a hydraulic actuator according to a fifth aspect of the present invention is the speed control device for a hydraulic actuator according to the third aspect, wherein the switch actuator is a switch operation plate, is slidably attached to the cam follower at the cam portion, and is attached to the cam follower. It is biased toward.
  • the switch actuator is a switch operation plate, is slidably attached to the cam follower at the cam portion, and is attached to the cam follower. It is biased toward.
  • the cam surface of the cam can be fixed at the operating position. Since the amount of movement of the cam follower is different between the high speed cam and the normal cam, the engine rotational speed can be increased or decreased in the high region or increased or decreased by selecting one of the cams.
  • the cam device has a structure in which two cams are overlapped and has a simple structure with a small number of parts, so that failure is unlikely to occur and low cost can be realized. Moreover, it can be retrofitted to an existing working machine by replacing the cam device.
  • the cam follower can be moved by the normal cam when the normal cam is moved forward, and the cam follower can be moved by the high speed cam when the normal cam is moved backward. Since the forward position and the backward position of the normal cam can be held by the two-position holding notch, the speed of the hydraulic actuator can be reliably controlled without causing the normal cam to malfunction during the lever operation.
  • the high / low speed variable motor is automatically switched to the high speed mode or the low speed mode by the switch actuator, so that the mode change is simple.
  • the high / low speed mode of the high / low speed variable motor can be switched by operating the changeover switch with the push piece.
  • the high / low speed mode of the high / low speed variable motor can be switched by operating the changeover switch with the switch operation plate.
  • FIG. 1 is a hydraulic circuit diagram of a winch motor that is an example of a hydraulic actuator to which the present invention is applied.
  • the cam apparatus which concerns on 1st Embodiment is shown, (A) is a perspective view which shows the surface side, (B) is a perspective view which shows a back surface side. (A) is explanatory drawing of the cam for high speed, (B) is explanatory drawing of the cam for normal. It is usage explanatory drawing by the cam for high speed.
  • the cam apparatus which concerns on 2nd Embodiment is shown, (A) is a perspective view which shows the surface side, (B) is a perspective view which shows a back surface side.
  • (A) is explanatory drawing of a cam for normal use
  • (B) is usage explanatory drawing.
  • (A) is explanatory drawing of the cam for high speed
  • (B) is usage explanatory drawing.
  • It is a relation explanatory view of lever operation amount and hook speed in the speed control device of a 1st embodiment. It is a relationship explanatory drawing of the lever operation amount and hook speed in the speed control device of a 2nd embodiment.
  • a truck-mounted crane is taken as an example of a working vehicle to which the present invention is applied, and its basic structure will be described.
  • CP is a crane post
  • B is a multistage boom
  • F is a hook
  • J is an outrigger jack.
  • the crane post CP turns on the swivel
  • the boom B moves up and down with the hoisting cylinder Cy, and expands and contracts with a boom built-in telescopic cylinder (not shown).
  • the hook F is moved up and down by winding and lowering the wire rope with a winch W attached to the crane post CP.
  • the multistage boom B, the hook F, the outrigger jack J, the winch W, and the like described above are examples of the working machine referred to in the claims.
  • the telescopic cylinder, the undulation cylinder, the winch motor, the jack cylinder, and the like are examples of the hydraulic actuator referred to in the claims.
  • Each of these hydraulic actuators is connected to a known hydraulic circuit including a hydraulic pump, a hydraulic control valve, a tank and the like.
  • the hydraulic control valve can switch the pressure oil feed direction and adjust the valve opening with a plurality of manual operation levers Lv shown in FIG.
  • FIG. 1 shows the operation lever Lw around the winch motor M.
  • This operation lever Lw is one of the plurality of manual operation levers Lv shown in FIG.
  • a cam portion 2 is attached to the base portion of the operation lever Lw.
  • the cam portion 2 is supported by the vertical axis 4 so that the operation lever Lw can be tilted left and right around the vertical axis 4.
  • a cylindrical cam follower 5 is disposed facing the cam portion 2, and the cam follower 5 is supported by a link 6 and a support shaft 7 and is swingably attached around the support shaft 7.
  • the cam portion 2 and the cam follower 5 constitute a cam device 1 as defined in the claims.
  • the accelerator is typical. Therefore, in the following embodiments, the accelerator is the control object, and the cam follower 5 referred to in the claims is provided.
  • a description will be given of the accelerator roller 5 that adjusts the accelerator of the engine.
  • An arm 8 is attached to the lower portion of the support shaft 7 so as to extend radially outward, and an accelerator wire 9 connected to the arm 8 is connected to an accelerator for controlling the engine speed of the work vehicle. . For this reason, when the accelerator roller 5 swings and the accelerator wire 9 is pushed and pulled, the engine speed increases and the discharge amount of the hydraulic pump also increases and decreases, and the drive speed of the hydraulic actuator increases and decreases.
  • the left and right tilting of the operating lever Lw is connected to the spool end of a hydraulic control valve V for winch motor control (shown in FIG. 2) by a dedicated link or the like. Can be controlled.
  • a hydraulic circuit of the winch motor M that is a target of speed control is a winch hydraulic motor (hereinafter referred to as a winch motor), and a known hydraulic circuit comprising a hydraulic control valve V, a hydraulic pump P, and a tank T is used for forward and reverse rotation of the winch motor M.
  • a winch hydraulic motor hereinafter referred to as a winch motor
  • a known hydraulic circuit comprising a hydraulic control valve V, a hydraulic pump P, and a tank T is used for forward and reverse rotation of the winch motor M.
  • the winch motor M is a high and low speed hydraulic motor, and is a known hydraulic actuator that can select two modes of a low speed rotation mode and a high speed rotation mode.
  • the low-speed rotation mode can output low-speed and high-torque compared to the high-speed rotation mode.
  • the high / low speed mode can be switched by changing the eccentric angle of the rotor if the winch motor M is a radial type, or by a known means such as changing the tilt angle of the drive shaft and the cylinder block if the winch motor M is an axial type.
  • the switching of the winch motor M between the high speed mode and the low speed mode is performed by the switching cylinder Cm, and a solenoid-operated on-off valve Vm is provided to control expansion and contraction of the switching cylinder Cm.
  • the solenoid S is connected to a power source via the changeover switch 40. This changeover switch 40 is attached to the cam portion 2 described in detail later.
  • the hydraulic pump P is driven to rotate by the engine E of the work vehicle, and the engine speed is increased or decreased by the accelerator A.
  • the engine speed is controlled through the accelerator wire 9 pushed and pulled by the operation lever Lw shown in FIG. 1 as described above.
  • the cam portion 2 in the first embodiment includes a high-speed cam 10 and a normal cam 20.
  • the high-speed cam 10 is a plate material bent into a U shape in a side view, and a base portion thereof is attached to a base portion of the operation lever Lw.
  • the cam plate of the high-speed cam 10 is formed with a hole 11 and a guide groove 12 through which the support shaft 4 is passed.
  • the high-speed cam 10 may be fixed to the support shaft 4 that passes through the hole 11 so that the support shaft 4 is rotatable.
  • the support shaft 4 is fixed, and the high-speed cam 10 (and thus the cam portion) around the hole 11. 2) may be tilted to the left and right.
  • the guide groove 12 is curved, and the guide shaft 3 shown in FIG. 1 passes through the guide groove 12, thereby guiding the tilting of the cam portion 2 in the left-right direction and restricting the stroke end.
  • the profile of the cam surface 13 of the high-speed cam 10 is composed of a non-control surface 14 at the center and rotation speed control surfaces 15 and 15 on both sides thereof.
  • the non-control surface 14 is a portion that does not control the engine speed. While the non-control surface 14 is in contact with the accelerator roller 5, the hydraulic system is operated by the link system dedicated to opening and closing the valve connected to the operation lever Lw. The switching direction and valve opening degree of the control valve V are controlled.
  • the rotational speed control surfaces 15 and 15 on both sides of the cam surface 13 are parts for controlling the rotational speed of the engine E shown in FIG. 2, and when the rotational speed control surfaces 15 and 15 push the accelerator roller 5, the arm 8 swings.
  • the accelerator wire 9 is pushed and pulled to increase or decrease the engine speed.
  • the normal cam 20 is slidably attached to the back surface of the high-speed cam 10.
  • the normal cam 20 has a shape similar to that of the high-speed cam 10 and has a curved guide groove 22, a switch actuator 26, and a finger ring 27.
  • the guide groove 22 is formed wider than the guide groove 12 of the high speed cam 10, and the guide shaft shown in FIG. 1 is shown when the normal cam 20 is pushed out to the operating position and retracted to the non-operating position. 3 is allowed.
  • the switch operator 26 is an operator for operating the changeover switch 40 on and off, and the switch operator 26 pushes and operates the changeover switch 40 when the normal cam 20 is pushed out to the operating position.
  • the finger ring 27 can hook a human finger and is provided to push and pull the normal cam 20 with the human hand.
  • the profile of the cam surface 23 of the normal cam 20 is composed of a non-control surface 24 at the center and rotation speed control surfaces 25 and 25 on both sides thereof.
  • the non-control surface 24 is a portion that does not control the engine speed, and while the non-control surface 24 pushes the accelerator roller 5, the hydraulic control valve is connected to the above-described link system dedicated to opening and closing the valve connected to the operation lever Lw. The switching direction of V and the valve opening are controlled.
  • the rotational speed control surface 25 of the normal cam 20 is a part for controlling the rotational speed of the engine E shown in FIG. 2, and the cam surface is higher than the rotational speed control surface 15 of the high-speed cam 10 described above. . That is, it is possible to increase the engine speed by largely pushing and pulling the accelerator wire 9.
  • Three guide pins 17 are planted on the back surface of the high-speed cam 10, and two guide long holes 28 and one notch long hole 29 are provided on the cam plate of the normal cam 20. Yes.
  • the two guide pins 17 are fitted into two guide slots 28 and serve as slide guides.
  • a two-position holding notch 29n is formed in the notch long hole 29, and one guide pin 17 is fitted in the two-position holding notch 29n.
  • the two-position holding notch 29n has a function of allowing the guide pin 17 to move between the two holes by a slight elastic deformation and holding the guide pin 17 in the hole. Therefore, the normal cam 20 can be manually changed between the cam operating position and the non-operating position, and can be held so that the cam does not move arbitrarily at any position. For this reason, malfunction can also be prevented.
  • This mechanism is a position fixing mechanism referred to in the claims.
  • the engine speed (thin line e1) shown in the lower graph keeps a constant rotation (idle state) of 800 rpm below the point A, increases linearly after the point A, and reaches 2000 rpm.
  • the valve opening (thin line v) of the hydraulic control valve V shown in the middle graph increases linearly from the 0 point to the B point where the opening is slightly larger than the A point, and after the B point the same opening (the valve passing at this time)
  • the flow rate changes at, for example, 20 L).
  • the accelerator roller 5 moves greatly as the lever pulling amount is increased, and the moving amount of the accelerator wire 9 is increased. growing.
  • the engine speed can be increased linearly from an idle state (800 rpm) to, for example, 2000 rpm, and the hydraulic oil discharge amount of the hydraulic pump P can be increased from, for example, 20 L / min to 60 L / min.
  • the winch motor M is supplied with hydraulic oil at a maximum of 60 L / min, for example, and the hook F can be moved at, for example, 19 m / min as indicated by the thick solid line fs. Further, in this normal operation, high torque can be output and heavy objects can be lifted. Since the engine speed increases, noise and the like increase.
  • the engine speed is idling (800 rpm), and the flow rate flowing into the winch motor M is, for example, Increase or decrease linearly up to 20 L / min.
  • the winch motor M in the high-speed mode rotates at a small amount of oil, the hook speed fs is fast. For this reason, if the load is light, it can be raised and lowered quickly, but fine movement operation is difficult instead.
  • the winch motor M has a high rotational speed even at a small flow rate, so that a high hook speed fs (for example, 19 m / min at the same maximum as in normal operation) can be maintained after the point A. In this case, since the engine speed is kept low, noise and the like are suppressed. This mode is suitable for work in urban areas and at night.
  • the winch motor M is in the high speed mode, the output of the winch W does not become a high torque, so if it is a light load, it can be used for winding it.
  • the hook speed is the same as the conventional one, the engine speed can be reduced and the fuel consumption can be suppressed. It is also effective for suppressing an increase in the oil temperature of the hydraulic system.
  • the cam apparatus 1 of 2nd Embodiment is demonstrated based on FIGS. 6-8.
  • the high speed cam 10 and the normal cam 20 constituting the cam portion 2 shown in FIG. 6A are the same as those in the first embodiment.
  • the present embodiment is characterized in that a switch actuator is not formed on the normal cam 20 and a switch operating plate 30 dedicated to switch switching operation is provided.
  • the switch operating plate 30 is formed with a push piece 31 for turning the changeover switch 40 on and off.
  • the switch operating plate 30 is disposed on the back surface of the normal cam 20 and is slidably attached to the guide pin 17 through a long hole (not shown). Further, although it is always pushed out to the accelerator roller 5 side by an appropriate biasing means (not shown) such as a spring, it is pushed back by the accelerator roller 5 when it comes into contact with the accelerator roller 5.
  • an appropriate biasing means such as a spring
  • FIG. 7 shows a state in which the non-control surface 24 of the normal cam 20 is used. In this case, the operation by adjusting the valve opening by the operation lever Lw is performed below the point A in FIG. 9A. Is called.
  • FIG. 7B shows a state in which the rotational speed control surface 25 is used. In this case, an operation is performed by increasing or decreasing the engine rotational speed at point A or higher in FIG. 9A. Details of such operation are the same as those of the first embodiment described above.
  • the speed of the hook F can maintain a high speed (for example, 19 m / min at the same maximum as the normal operation) after the point A.
  • the engine speed can be suppressed lower than that speed, so noise and the like are suppressed.
  • This mode is suitable for work in urban areas and at night.
  • the hydraulic motor M is in the high speed mode, the output of the winch W does not become a high torque, so if it is a light load, it can be used for winding it.
  • the hook speed is the same as that in the normal operation, the engine speed can be reduced and fuel consumption can be suppressed. It is also effective for suppressing an increase in the oil temperature of the hydraulic system.
  • the specifications of the winch motor M in this embodiment are as follows.
  • the standard for switching the high and low speed motor M is normal mode operation when the load is 1.7 t or more, and high speed mode operation when the load is 1.7 t or less.
  • the hook speed can be the same as in normal operation, but the engine speed can be reduced and fuel consumption can be reduced. It is also effective for suppressing an increase in the oil temperature of the hydraulic system.
  • the high-speed cam 10 is fixed to the operation lever Lw.
  • the normal cam 20 is fixed to the lever 1 and the high-speed cam 10 is slidably attached to the normal cam 20.
  • a switch actuator 26 for operating the changeover switch 40 may be attached to the high-speed cam 10.
  • cam device 1 used in the present invention has a simple structure based on the two cams 10 and 20, the number of parts is small and failure is unlikely to occur.
  • the present invention is applied to a winch of a truck-mounted crane.
  • the present invention can be applied to various other industrial machines and hydraulic working machines incorporated in those industrial machines.
  • the present invention can be used not only for a truck equipped with a crane but also for an automobile transport vehicle, an aerial work vehicle, and the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control And Safety Of Cranes (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Fluid-Pressure Circuits (AREA)
PCT/JP2015/000009 2014-01-15 2015-01-05 油圧アクチュエータの速度制御装置 Ceased WO2015107868A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201580003011.8A CN105814296B (zh) 2014-01-15 2015-01-05 液压致动器的速度控制装置
KR1020167015890A KR101800718B1 (ko) 2014-01-15 2015-01-05 유압 액츄에이터의 속도 제어장치

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014004756A JP6202744B2 (ja) 2014-01-15 2014-01-15 油圧アクチュエータの速度制御装置
JP2014-004756 2014-01-15

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WO2015107868A1 true WO2015107868A1 (ja) 2015-07-23

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JP (1) JP6202744B2 (enExample)
KR (1) KR101800718B1 (enExample)
CN (1) CN105814296B (enExample)
WO (1) WO2015107868A1 (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112209218A (zh) * 2020-09-30 2021-01-12 上海富朗德机械设备有限公司 一种汽车车身多车型平台切换吊具切换站

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111465573B (zh) * 2017-12-18 2022-06-03 株式会社多田野 起重机

Citations (2)

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Publication number Priority date Publication date Assignee Title
JPH0647701U (ja) * 1992-11-30 1994-06-28 株式会社タダノ 油圧作業機のエンジン回転制御装置
JP2528724Y2 (ja) * 1990-11-20 1997-03-12 株式会社タダノ 作業車のアクセル制御装置

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Publication number Priority date Publication date Assignee Title
CN1177952A (zh) * 1995-03-10 1998-04-01 株式会社小松制作所 绞车的速度控制方法及控制系统
JP4487702B2 (ja) 2004-09-17 2010-06-23 井関農機株式会社 作業車両
CN102857853B (zh) 2012-10-09 2014-10-29 歌尔声学股份有限公司 耳机测试装置

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Publication number Priority date Publication date Assignee Title
JP2528724Y2 (ja) * 1990-11-20 1997-03-12 株式会社タダノ 作業車のアクセル制御装置
JPH0647701U (ja) * 1992-11-30 1994-06-28 株式会社タダノ 油圧作業機のエンジン回転制御装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112209218A (zh) * 2020-09-30 2021-01-12 上海富朗德机械设备有限公司 一种汽车车身多车型平台切换吊具切换站

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CN105814296A (zh) 2016-07-27
KR101800718B1 (ko) 2017-11-23
JP6202744B2 (ja) 2017-09-27
JP2015132226A (ja) 2015-07-23
CN105814296B (zh) 2019-01-01
KR20160090834A (ko) 2016-08-01

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