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1. 发明授权

US5279122A Hydraulic circuit apparatus for supplying fluid under pressure into hydraulic cylinders for work implement 失效
标题翻译：液压回路装置，用于将压力下的液体供给工作液压缸
公开(公告)号：US5279122A
公开(公告)日：1994-01-18
申请号：US38189
申请日：1993-03-29
申请人： Kiyoshi Shirai , Teruo Akiyama , Shigeru Shinohara , Naoki Ishizaki , Takahide Takiguchi
发明人： Kiyoshi Shirai , Teruo Akiyama , Shigeru Shinohara , Naoki Ishizaki , Takahide Takiguchi
IPC分类号： E02F9/22 , F15B11/16 , F16D31/02
CPC分类号： F15B11/165 , E02F9/2235 , E02F9/2296 , F15B11/163 , F15B2211/20523 , F15B2211/20553 , F15B2211/20592 , F15B2211/253 , F15B2211/40515 , F15B2211/40569 , F15B2211/41572 , F15B2211/428 , F15B2211/455 , F15B2211/6054 , F15B2211/6058 , F15B2211/6303 , F15B2211/6346 , F15B2211/7052 , F15B2211/71
摘要： This invention aims at providing a hydraulic circuit apparatus for supplying pressurized fluid into cylinders for a work implement arranged such that during normal operation of the work implement the flow rate of fluid discharged by a pump is controlled such that the difference between the discharge pressure of the pump and the load pressure is always kept constant, whilst during inching operation of the work implement the flow rate of fluid discharged by the pump is reduced. This circuit apparatus comprises a large diameter piston (9) for actuating a displacement regulating member (8) of a variable displacement pump (2) in a direction as to reduce the displacement of the pump; a small diameter piston (10) having pressure receiving chamber (10a) connected with discharge passage (2a) of the pump and adapted to actuate discharge regulating member (8) in a direction as to increase the displacement of the pump (2); a load sensing valve (11) for connecting or disconnecting pressure receiving chamber (9a) of the large piston (9) with or from the discharge passage; and apparatus (12, 13, 14) for applying a force to the load sensing valve to push its spool in a direction as to communicate the discharge passage (2a) of the pump with pressure receiving chamber (9a) of the large piston.
摘要翻译：本发明的目的在于提供一种液压回路装置，用于将加压流体供应到用于工作工具的气缸中，该工作工具被布置为使得在工作的正常操作期间，控制由泵排出的流体的流量，使得排出压力泵和负载压力始终保持恒定，而在工作的微动操作期间，减少了由泵排出的流体的流量。该电路装置包括大直径活塞（9），用于在减小泵的排量的方向上致动可变排量泵（2）的排量调节构件（8）; 具有与所述泵的排出通道（2a）连接的压力接收室（10a）的小直径活塞（10），并且适于在增加所述泵（2）的位移的方向上致动排放调节构件（8）。负载感测阀（11），用于将大活塞（9）的压力接收室（9a）与排出通道或从排出通道连接或断开; 以及用于向负载感测阀施加力以沿着使泵的排出通道（2a）与大活塞的压力接收室（9a）连通的方向推动其阀芯的装置（12,13,14）。

2. 发明授权

US5212950A Hydraulic circuit with pilot pressure controlled bypass 失效
标题翻译：液压回路控制旁路压力
公开(公告)号：US5212950A
公开(公告)日：1993-05-25
申请号：US882367
申请日：1992-05-06
申请人： Kiyoshi Shirai , Teruo Akiyama , Shigeru Shinohara , Naoki Ishizaki , Takahide Takiguchi
发明人： Kiyoshi Shirai , Teruo Akiyama , Shigeru Shinohara , Naoki Ishizaki , Takahide Takiguchi
IPC分类号： F15B13/042
CPC分类号： F15B13/0422
摘要： This invention provides a hydraulic circuit apparatus arranged such that when each of operating valves is operated suddenly, the stability of each of actuators is improved, and when the operating valves are kept at their neutral positions, the flow rate of fluid discharged by a variable displacement pump is increased to improve the response of the hydraulic circuit, and when the actuators are supplied with pressurized fluid, pressure compensation is made by pressure compensating valves. This hydraulic circuit apparatus comprises a bleed-off circuit (11) connecting the discharge passage (1a) of the variable displacement pump (1) with a fluid tank; a bleed-off valve (12) provided in bleed-off circuit (11) and adapted to be kept at its communicating position (I) when the operating valves (2) assume their neutral positions, and also kept at its shut-off position when the operating valves assume either their first fluid supply positions or their second fluid supply positions; and a flow restrictor (13) provided in the bleed-off circuit.

3. 发明授权

US5209063A Hydraulic circuit utilizing a compensator pressure selecting value 失效
标题翻译：利用补偿器压力选择值的液压回路
公开(公告)号：US5209063A
公开(公告)日：1993-05-11
申请号：US877364
申请日：1992-05-04
申请人： Kiyoshi Shirai , Shigeru Shinohara , Teruo Akiyama , Takahide Takiguchi , Naoki Ishizaki
发明人： Kiyoshi Shirai , Shigeru Shinohara , Teruo Akiyama , Takahide Takiguchi , Naoki Ishizaki
IPC分类号： E02F9/22 , F15B11/16
CPC分类号： F15B11/165 , E02F9/22 , E02F9/2225 , F15B2211/20546 , F15B2211/253 , F15B2211/40569 , F15B2211/428 , F15B2211/455 , F15B2211/50518 , F15B2211/5153 , F15B2211/6054 , F15B2211/6057 , F15B2211/635 , F15B2211/71
摘要： A hydraulic circuit arranged to prevent the load pressure in one of the hydraulic actuators at the time of starting from becoming abnormally high thereby preventing fluid under pressure from being relieved by the safety valve when a plurality of hydraulic actuators are operated at the same time, wherein the function of one of the pressure compensating valves is temporarily enhanced by introducing the load pressure in the hydraulic actuator so as to supply a large quantity of fluid under pressure to the hydraulic actuator connected to the pressure compensating valve so that the operating speed of the hydraulic actuator can be increased. This hydraulic circuit comprises a compensation pressure selecting valve adapted to supply normally the highest load pressure to the spring chambers of the pressure compensating valves, and supply the load pressure in the hydraulic actuator connected to each of the pressure compensating valves to the spring chamber of each of the pressure compensating valves when either one of the operating valves is operated for the full stroke.
摘要翻译： PCT No.PCT / JP90 / 00667 Sec。 371日期：1991年4月9日 102（e）日期1991年4月9日PCT提交1990年5月24日PCT公布。第WO90 / 14519号公报日本1990年11月29日。一种液压回路，其布置成防止在启动时一个液压致动器中的负载压力变得异常高，从而当多个液压致动器为多个时，防止压力下的流体被安全阀释放同时操作，其中通过将液压致动器中的负载压力引入到压力补偿阀中的一个压力补偿阀的功能，以便向连接到压力补偿阀的液压致动器供应大量压力流体，从而可以提高液压执行器的运行速度。该液压回路包括补偿压力选择阀，该补偿压力选择阀适于向压力补偿阀的弹簧室提供最高的负载压力，并将连接到每个压力补偿阀的液压致动器中的负载压力提供给每个压力补偿阀的弹簧室的压力补偿阀，当操作阀中的任何一个操作全冲程时。

4. 发明授权

US5477678A Hydraulic circuit system 失效
标题翻译：液压回路系统
公开(公告)号：US5477678A
公开(公告)日：1995-12-26
申请号：US839664
申请日：1992-02-14
申请人： Kiyoshi Shirai , Terruo Akiyama , Shigeru Shinohara , Naoki Ishizaki , Takahide Takiguchi
发明人： Kiyoshi Shirai , Terruo Akiyama , Shigeru Shinohara , Naoki Ishizaki , Takahide Takiguchi
IPC分类号： E02F9/22 , F15B11/16 , F15B13/04 , F16D31/02
CPC分类号： E02F9/2214 , F15B11/16 , F15B13/0417 , F15B2211/20546 , F15B2211/3054 , F15B2211/3111 , F15B2211/329 , F15B2211/6054 , F15B2211/71
摘要： In a hydraulic circuit system, when pressurized oil discharged from a single hydraulic pump is supplied to a plurality of actuators: the pressurized oil is supplied to heavily-loaded ones of the actuators at gradually reducing flow rates to reduce a shock, while supplied to lightly-loaded ones of the actuators at gradually increasing flow rates to increase working speeds of these lightly-loaded actuators. The hydraulic circuit system comprises a plurality of directional control valves (2) one of which is provided with pressure-compensated flow control valves (18) each of which is provided with a load lead-in passage having a restriction means (R). In addition, further comprised in the system are: relief valves (22, 22) for relieving the pressurized oil under the influence of load pressure of the actuators (3) operated by the directional control valves (2); a restriction orifice (24) provided in a drain side of each of the relief valves so as to produce pressure therein.
摘要翻译：在液压回路系统中，当从单个液压泵排出的加压油被供给到多个致动器时：在逐渐减小流量的同时向加载的致动器供应压力油，以减少冲击，同时供给轻度在逐渐增加的流量下执行器中的一个，以增加这些轻载驱动器的工作速度。液压回路系统包括多个方向控制阀（2），其中一个方向控制阀设置有压力补偿流量控制阀（18），每个阀都设置有具有限制装置（R）的负载引入通道。此外，该系统还包括：用于在由方向控制阀（2）操作的致动器（3）的负载压力的影响下释放加压油的安全阀（22,22）; 设置在每个安全阀的排水侧的限制孔（24），以在其中产生压力。

5. 发明授权

US5218897A Hydraulic circuit apparatus for operating work-implement actuating cylinders 失效
标题翻译：用于工作执行执行缸的液压回路装置
公开(公告)号：US5218897A
公开(公告)日：1993-06-15
申请号：US655351
申请日：1991-02-22
申请人： Kiyoshi Shirai , Terruo Akiyama , Shigeru Shinohara , Naoki Ishizaki , Takahide Takiguchi
发明人： Kiyoshi Shirai , Terruo Akiyama , Shigeru Shinohara , Naoki Ishizaki , Takahide Takiguchi
IPC分类号： E02F9/22 , F15B11/024 , F15B13/02
CPC分类号： F15B11/024 , E02F9/2221 , F15B13/021 , F15B2011/0243 , F15B2211/20546 , F15B2211/30505 , F15B2211/3054 , F15B2211/30555 , F15B2211/3058 , F15B2211/3111 , F15B2211/3133 , F15B2211/31529 , F15B2211/31576 , F15B2211/329 , F15B2211/6054 , F15B2211/75 , Y10T137/87185
摘要： This invention provides a hydraulic circuit apparatus for operating a work-implement actuating cylinder arranged such that, during an earth compacting operation using a bucket, a work implement or boom is lowered by its own weight, and during other operations, a part of the fluid under pressure in a lifting chamber of the actuating cylinder is supplied together with pressurized fluid discharged by a pump into a lowering chamber to increase the retracting speed of a piston rod in the work-implement actuating cylinder. The apparatus comprises a spool slidably inserted in a valve bore formed in an operating valve body so that it may be moved between a first actuating position, where a second port connected to the lowering chamber is communicated with a second tank port and a first port connected to the lifting chamber is communicated with a first pump port; and a second actuating position, where the second port is communicated with a second pump port and the first port is communicated with a first tank port. A regenerative fluid passage, including a check valve, is formed in the valve body so as to allow the first and second ports to communicate together.
摘要翻译： PCT No.PCT / JP90 / 00829 Sec。 371日期1991年2月22日 102（e）日期1991年2月22日PCT Filed 1990年6月26日PCT公布。出版物WO91 / 00431 日本1991年1月10日。本发明提供了一种液压回路装置，用于操作工作台致动筒，其布置成使得在使用铲斗的地球压实操作期间，工件或吊杆由其自重降低，并且在其他操作中，在致动缸的提升室中的压力下的一部分流体与由泵排出的加压流体一起供应到下降室中，以增加工作机构致动缸中的活塞杆的回缩速度。该装置包括可滑动地插入形成在操作阀体中的阀孔中的阀芯，使得其可在第一致动位置和连接到下降室的第二端口与第二罐口连通的第一致动位置和连接的第一端口之间移动所述升降室与第一泵口连通; 以及第二致动位置，其中所述第二端口与第二泵口连通，并且所述第一端口与第一罐口连通。包括止回阀的再生流体通道形成在阀体中，以允许第一和第二端口连通在一起。

6. 发明授权

US5188147A Pressure compensating type hydraulic valve 失效
标题翻译：压力补偿式液压阀
公开(公告)号：US5188147A
公开(公告)日：1993-02-23
申请号：US611499
申请日：1990-11-13
申请人： Kiyoshi Shirai , Kazuo Uehara , Koichi Morita , Takahide Takiguchi , Naoki Ishizaki
发明人： Kiyoshi Shirai , Kazuo Uehara , Koichi Morita , Takahide Takiguchi , Naoki Ishizaki
IPC分类号： E02F9/22 , F15B11/00 , F15B11/05 , F15B13/04
CPC分类号： E02F9/2296 , E02F9/2225 , E02F9/2232 , F15B13/0417 , Y10T137/87169 , Y10T137/87185
摘要： A pressure compensating type hydraulic valve wherein a pressure compensation can be made according to the movement of the movable portion of a hydraulic actuator, and the movable portion of the actuator can be stopped against load pressure when it is located at its neutral position. This pressure compensating type hydraulic valve is arranged such that a spool (24) is moved in a valve hole (16) so as to allow a first actuating port (21) and a second actuating port (22) connected with pressure receiving chambers (13.sub.1, 13.sub.2), respectively, defined on both sides of a movable portion (13.sub.3) of a hydraulic actuator (13) to be selectively connected with or disconnected from a first pumping port and a second pumping port in which fluid under pressure discharged by a hydraulic pump (10) flows, through the intermediary of a first check valve (31) and a second check valve (32), respectively, both of which are preset at predetermined pressures, and either one of the actuating ports which is isolated from the pumping port is connected with either one of the tank ports (33.sub.1, 33.sub.2).

7. 发明授权

US5398507A Hydraulic circuit system 失效
标题翻译：液压回路系统
公开(公告)号：US5398507A
公开(公告)日：1995-03-21
申请号：US856972
申请日：1992-06-03
申请人： Teruo Akiyama , Naoki Ishizaki , Kiyoshi Shirai , Koji Yamashita , Shin-ichi Shinozaki
发明人： Teruo Akiyama , Naoki Ishizaki , Kiyoshi Shirai , Koji Yamashita , Shin-ichi Shinozaki
IPC分类号： F15B11/00 , E02F9/22 , F15B11/05 , F15B11/16 , F16D31/02
CPC分类号： E02F9/2225 , E02F9/2232 , E02F9/2296 , F15B11/165 , F15B2211/20553 , F15B2211/20592 , F15B2211/40515 , F15B2211/40569 , F15B2211/413 , F15B2211/455 , F15B2211/6052 , F15B2211/6054 , F15B2211/6058 , F15B2211/6355 , F15B2211/71
摘要： This invention has for its aim to provide a hydraulic circuit system arranged such that, even at the time of commencement of drive of a hydraulic actuator with a large inertia, a slow rise in the drive pressure can be achieved, thereby preventing the occurrence of hunting phenomenon. The hydraulic circuit system according to the present invention comprises a plurality of operating valves (15) provided in a discharge conduit (10a) of a hydraulic pump (10), and pressure compensating valves (18) provided in connection conduits between these operating valves (15) and respective hydraulic actuators (16), wherein each of the pressure compensating valves (18) is set at a highest value of load pressures of each of the hydraulic actuators (16), and the displacement of the pump is controlled by a change-over valve (14) adapted to be actuated by the difference between the pump discharge pressure and the load pressure. The hydraulic circuit comprises a bypass conduit (31) connected with a load pressure introduction conduit (30) for introducing the load pressure into a pressure receiving portion of the change-over valve (14). This bypass conduit is connected through a bypass valve (32) adapted to conduct throttling of fluid in inverse proportion to the change in the area of opening of each of the operating valves (15).
摘要翻译： PCT No.PCT / JP91 / 01284第 371日期：1992年6月3日 102（e）日期1992年6月3日PCT 1991年9月26日PCT公布。出版物WO92 / 06304 本发明的目的在于提供一种液压回路系统，其设置为使得即使在开始具有大惯性的液压致动器的驱动时，也可以实现驱动压力的缓慢上升，从而防止发生狩猎现象。根据本发明的液压回路系统包括设置在液压泵（10）的排出管道（10a）中的多个操作阀（15）和设置在这些操作阀之间的连接管道中的压力补偿阀（18） 15）和相应的液压致动器（16），其中每个压力补偿阀（18）被设置在每个液压致动器（16）的负载压力的最高值，并且泵的位移由变化控制（14），其适于由泵排出压力和负载压力之间的差异致动。液压回路包括与负载压力引入导管（30）连接的旁通管道（31），用于将负载压力引入转换阀（14）的受压部分。该旁通管道通过旁通阀（32）连接，该旁通阀（32）适于与每个操作阀（15）的打开面积的变化成反比地导通流体节流。

8. 发明授权

US5273069A Operation valve with pressure compensation valve 失效
标题翻译：带压力补偿阀的操作阀
公开(公告)号：US5273069A
公开(公告)日：1993-12-28
申请号：US793385
申请日：1992-03-16
申请人： Teruo Akiyama , Kiyoshi Shirai , Naoki Ishizaki , Koji Yamashita , Shinichi Shinozaki
发明人： Teruo Akiyama , Kiyoshi Shirai , Naoki Ishizaki , Koji Yamashita , Shinichi Shinozaki
IPC分类号： F15B11/00 , E02F9/22 , F15B11/05 , F15B11/08 , F15B13/04 , F15B13/02
CPC分类号： E02F9/2232 , E02F9/2225 , E02F9/2296 , F15B13/0417 , Y10T137/87169 , Y10T137/87185
摘要： An operation valve having a pressure compensation valve of relatively simple non-complicated internal body structure. In the valve body, a load pressure introducing passage, a check valve and a restriction are formed inside the spool comprising the operation valve. An intermediate pressure between an inlet pressure and an outlet pressure of the compensation valve which is arranged in the valve body, may be supplied to a pressure receiving section of the pressure compensation valve through an oil hole of the spool. The operation valve with the pressure compensation valve is of simple construction and may be easily manufactured.
摘要翻译： PCT No.PCT / JP91 / 00638 Sec。 371日期：1992年3月16日 102（e）1992年3月16日PCT PCT 1991年5月15日提交PCT公布。出版物WO91 / 18211 PCT 日期为1991年11月28日。具有相对简单的非复杂内部结构的压力补偿阀的操作阀。在阀体中，在包括操作阀的阀芯内部形成有负载压力引入通道，止回阀和限制器。布置在阀体中的补偿阀的入口压力和出口压力之间的中间压力可以通过阀芯的油孔供应到压力补偿阀的受压部分。具有压力补偿阀的操作阀结构简单，制造容易。

9. 发明授权

US5271227A Hydraulic apparatus with pressure compensating valves 失效
标题翻译：带压力补偿阀的液压装置
公开(公告)号：US5271227A
公开(公告)日：1993-12-21
申请号：US793395
申请日：1992-01-09
申请人： Teruo Akiyama , Kiyoshi Shirai , Naoki Ishizaki , Koji Yamashita , Shinichi Shinozaki
发明人： Teruo Akiyama , Kiyoshi Shirai , Naoki Ishizaki , Koji Yamashita , Shinichi Shinozaki
IPC分类号： E02F9/22 , F15B11/16 , F15B13/04 , F16D31/02 , F15B11/08
CPC分类号： E02F9/2232 , F15B11/163 , F15B11/165 , F15B13/0417 , F15B2211/20553 , F15B2211/3054 , F15B2211/3111 , F15B2211/3144 , F15B2211/40515 , F15B2211/40569 , F15B2211/413 , F15B2211/455 , F15B2211/6052 , F15B2211/6054 , F15B2211/6058 , F15B2211/7052 , F15B2211/71
摘要： In the hydraulic apparatus (1) according to a first aspect of the present invention, mid-pressures between the inlet side and outlet side pressures of a first and a second pressure compensating valves (4, 4') are permitted to act on the flow rate decreasing side pressure receiving surfaces (4b, 4b') thereof through first and second mid-pressure supplying means (13, 13'), thereby restraining operational error and malfunction of the pressure compensating valves (4, 4'). In the hydraulic apparatus (20) according to a second aspect of the present invention. when actuating valves are made to assume neutral position, holding pressures of hydraulic actuators (5, 5') are permitted to act on flow rate decreasing side pressure receiving surfaces (4b, 4b') of pressure compensating valves (4), (4') so that spools of the pressure compensating valves are held at compensating position, thereby improving the response of the hydraulic actuators (5, 5') to lever actuation.
摘要翻译： PCT No.PCT / JP91 / 00641 Sec。 371日期1992年1月9日 102（e）日期1992年1月9日PCT 1991年5月15日PCT PCT。出版物WO91 / 18212 PCT 1991年11月28日，在本发明的第一方面的液压装置（1）中，第一和第二压力补偿阀（4,4'）的入口侧和出口侧压力之间的中间压力，被允许通过第一和第二中压供给装置（13,13'）作用在其流量减小侧压力接收表面（4b，4b'）上，从而抑制压力补偿阀（4， 4'）。在本发明的第二方面的液压装置（20）中，当致动阀处于中立位置时，允许液压致动器（5,5'）的保持压力作用在压力补偿阀（4），（4'）的流量减小侧压力接收表面（4b，4b'）上，），使得压力补偿阀的阀芯保持在补偿位置，从而提高液压致动器（5,5'）对杠杆致动的响应。

10. 发明授权

US5481872A Hydraulic circuit for operating plural actuators and its pressure compensating valve and maximum load pressure detector 失效
标题翻译：用于操作多个执行器的液压回路及其压力补偿阀和最大负载压力检测器
公开(公告)号：US5481872A
公开(公告)日：1996-01-09
申请号：US244439
申请日：1994-09-23
申请人： Tadao Karakama , Teruo Akiyama , Kouji Yamashita , Naoki Ishizaki
发明人： Tadao Karakama , Teruo Akiyama , Kouji Yamashita , Naoki Ishizaki
IPC分类号： E02F9/22 , F15B11/17 , F15B13/04 , F16D31/02 , F15B11/08
CPC分类号： F15B13/0417 , E02F9/2225 , F15B11/17 , F15B2211/20553 , F15B2211/20576 , F15B2211/27 , F15B2211/3054 , F15B2211/3111 , F15B2211/40515 , F15B2211/40569 , F15B2211/41518 , F15B2211/428 , F15B2211/455 , F15B2211/50536 , F15B2211/5157 , F15B2211/6303 , F15B2211/6313 , F15B2211/6316 , F15B2211/6355 , F15B2211/65 , F15B2211/654 , F15B2211/6654 , F15B2211/7142 , F15B2211/78
摘要： Simultaneous operation efficiency in a case where a plurality of actuators are operated by one or a plurality of hydraulic pumps is improved. A delivery pressure passage (1a) of one hydraulic pump (1) and that (1a) of the other hydraulic pump (1) communicate with each other through a first short-circuit passage (39) via a pair of check valves (38, 38), and an unload valve (40) is provided in this first short-circuit passage (39). The load pressure introduction passages (6, 6) on the left and right hydraulic pumps (1, 1) communicate with each other through a second short-circuit passage (36) via a pair of check valves (35, 35), and a relief valve (37) is provided in this short-circuit passage (36). The unload valve (40) is unloaded by the differential pressure between the pump delivery pressure in the first short-circuit passage (39) and the load pressure in the second short-circuit passage (36), whereby a single relief valve (37) carries out a relieving operation both at the time of flow merging and at the time of flow branching to equalize the maximum pump delivery pressures. The set pressure of the relief valve (37) can be a high level so as to relieve the valve (37) under a predetermined high load pressure, whereby the relieving operation can be arbitrarily controlled.
摘要翻译： PCT No.PCT / JP92 / 01540 Sec。 371日期1994年9月23日 102（e）1994年9月23日PCT PCT日期：1992年11月25日PCT公布。公开号WO93 / 11364 日期：1993年6月10日。在多个致动器由一个或多个液压泵操作的情况下的同时操作效率提高。一个液压泵（1）的输送压力通道（1a）和另一个液压泵（1）的（1a）通过第一短路通道（39）经由一对止回阀（38， 38），在该第一短路通路（39）上设置有卸载阀（40）。通过一对止回阀（35,35），通过第二短路通路（36）将左右液压泵（1,1）的负荷压力引入通路（6,6）相互连通，在该短路通路（36）上设有安全阀（37）。卸载阀（40）通过第一短路通道（39）中的泵输送压力和第二短路通道（36）中的负载压力之间的压差来卸载，由此单个安全阀（37）在流动合并时和流动分支时均执行减压操作以均衡最大泵输送压力。安全阀（37）的设定压力可以是高水平，以便在预定的高负载压力下释放阀（37），从而可以任意地控制卸载操作。

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