CN113756964A - Speed regulation control device - Google Patents
Speed regulation control device Download PDFInfo
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- CN113756964A CN113756964A CN202111171826.0A CN202111171826A CN113756964A CN 113756964 A CN113756964 A CN 113756964A CN 202111171826 A CN202111171826 A CN 202111171826A CN 113756964 A CN113756964 A CN 113756964A
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- speed
- piston
- feedback
- regulating piston
- speed regulating
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
- F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
- F02D1/04—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered by mechanical means dependent on engine speed, e.g. using centrifugal governors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
- F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
- F02D1/04—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered by mechanical means dependent on engine speed, e.g. using centrifugal governors
- F02D1/045—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered by mechanical means dependent on engine speed, e.g. using centrifugal governors characterised by arrangement of springs or weights
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
- F02D2001/0085—Arrangements using fuel pressure for controlling fuel delivery in quantity or timing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses a speed regulation control device, which comprises a speed regulation piston cylinder, a speed regulation piston rod, a lever, a feedback cam, a one-way valve, a feedback seat, a feedback connecting rod and a speed regulation spring, wherein the speed regulation piston is connected with the speed regulation piston; the speed regulating piston cylinder receives control oil pressure to push the speed regulating piston and the speed regulating piston rod to move, and the control oil pressure is compared with the spring force below to determine the moving direction of the speed regulating piston and the speed regulating piston rod, so that the control oil pressure is compared with the speed regulating spring to control the movement of the slide valve to control the rotating speed; the feedback connecting rod is connected with the feedback cam through the first cylindrical pin, and the diesel engine can be more stable in the operation process by adjusting the feedback cam. The invention can realize the conversion of displacement signals into oil pressure, and then control the rotating speed of the diesel engine by the oil pressure.
Description
Technical Field
The invention belongs to the technical field of diesel engines, and particularly relates to a speed regulation control device.
Background
The governor is a speed control mechanism of the diesel engine. The condition of stable operation of the diesel engine at a certain rotating speed is that the output power must be balanced with the external load, and the change of the external load must cause the corresponding change of the rotating speed of the diesel engine. The output power of the diesel engine is directly related to the amount of fuel delivered into the cylinder by the fuel injection pump; if the oil supply quantity of the oil injection pump is kept unchanged, the rotating speed is increased when the external load is reduced; when the external load increases, the rotational speed decreases. The governor has the function of automatically increasing the oil supply amount of the oil injection pump when the rotating speed of the diesel engine is reduced; when the rotating speed is increased, the oil supply quantity of the oil injection pump is automatically reduced, so that the oil supply quantity of the oil injection pump is always adapted to the external load, and the stable operation of the diesel engine is ensured.
The speed regulator generally compresses the speed regulating spring by using a movable spring seat so as to regulate an oil way and push a power piston to control the rotating speed, and when the rigidity of the speed regulating spring is higher, the control precision of the direct compression spring is poor so as to influence the performance index of the diesel engine.
Therefore, it is necessary to develop a new speed control device.
Disclosure of Invention
The invention aims to provide a speed regulation control device with high control precision and good stability.
The speed regulation control device comprises a speed regulation spring, a speed regulation piston cylinder, a lever, a floating head, a feedback connecting rod, a speed regulation piston rod, a feedback seat and a feedback cam;
the piston part of the speed regulating piston slides and is in liquid seal with the speed regulating piston cylinder, and the rod part of the speed regulating piston extends out of the speed regulating piston cylinder;
the speed regulation piston rod and the rod part of the speed regulation piston are coaxially arranged and fixedly connected together;
the floating head is arranged at the upper end of the rod part of the speed regulating piston and is fixedly connected with the rod part of the speed regulating piston;
one end of the lever is connected with the floating head; the other end of the lever is used for being connected with a control valve spool, and the movement of the control valve spool is driven by the movement of the lever so as to control the oil pressure on the speed regulating piston;
one end of the feedback connecting rod is connected with the floating head through a first cylindrical pin, the other end of the feedback connecting rod is used for being connected with the power piston, and the feedback connecting rod is used for feeding back the position of the power piston;
the feedback cam is positioned below the first cylindrical pin and connected with the first cylindrical pin;
the feedback seat is arranged at the upper end of the speed regulation piston rod and is positioned right below the feedback cam to provide plane support for the feedback cam;
the feedback connecting rod receives the position of the power piston, transmits the position to the feedback cam through the first cylindrical pin and feeds the position to the feedback seat through the feedback cam, so that the position of the speed regulating piston rod is adjusted;
the speed regulating piston cylinder is internally provided with a speed regulating piston, the speed regulating piston is arranged below the speed regulating piston, the speed regulating piston cylinder receives control oil pressure to push the speed regulating piston and the speed regulating piston rod to move, the movement directions of the speed regulating piston and the speed regulating piston rod are determined by comparing the control oil pressure with the spring force of the speed regulating spring, and therefore the speed regulating piston and the speed regulating piston rod are compared with the speed regulating spring to control the movement of the slide valve to control the rotating speed.
Optionally, the speed-regulating device also comprises a one-way valve arranged on the speed-regulating piston cylinder; the floating head is provided with a maximum rotating speed limiting screw at a position corresponding to the one-way valve, when the maximum rotating speed is reached, the maximum rotating speed limiting screw on the floating head contacts the one-way valve, the one-way valve is opened, redundant oil pressure in the speed regulating piston cylinder is removed, and the maximum rotating speed is determined by limiting control oil pressure in the speed regulating piston cylinder.
Optionally, the diesel engine further comprises a lowest rotation speed limiting screw arranged on the speed regulation piston cylinder, the lower end of the lowest rotation speed limiting screw extends into the speed regulation piston cylinder, and when no oil pressure exists on the upper portion of the piston portion of the speed regulation piston, the lowest rotation speed limiting screw abuts against the speed regulation piston so as to set the lowest rotation speed of the diesel engine.
Optionally, the lever and the feedback link are disposed on opposite sides.
Optionally, one end of the lever is connected to the floating head by a second cylindrical pin.
Optionally, the feedback cam is connected with the first cylindrical pin through a socket head cap screw.
The invention has the following advantages:
(1) the feedback connecting rod and the lever are used for limiting the positions of the floating head and the speed regulating piston, the speed regulating piston cylinder receives control oil pressure to push the speed regulating piston and the speed regulating piston rod to move, the control oil pressure is compared with the spring force below the speed regulating piston cylinder to determine the moving direction of the speed regulating piston and the speed regulating piston rod, and therefore the control oil pressure is compared with the speed regulating spring to control the movement of the slide valve to control the rotating speed. The speed regulating piston cylinder is provided with a lowest rotating speed limiting screw for limiting the upward highest position of the speed regulating piston, so that the lowest rotating speed is limited. The upper part of the speed regulating piston cylinder is provided with a one-way valve, when the highest rotating speed is reached, the highest rotating speed limiting screw on the floating head contacts the one-way valve, and an oil way is opened to discharge redundant oil pressure into an oil pool to limit the highest rotating speed. One end of the feedback connecting rod is connected with the power piston and used for feeding back the position of the power piston, the other end of the feedback connecting rod is connected with the feedback cam, and the diesel engine can be more stable in the operation process by adjusting the feedback cam; under the condition of oil pressure failure, the floating head can be pressed down through the lever to push the speed regulation piston rod assembly and compress the speed regulation spring, so that the rotating speed is controlled.
(2) The speed regulating spring is provided with a speed regulating piston cylinder, a speed regulating piston rod, a floating head, a lever, a feedback connecting rod and the like, and a displacement signal is converted into an oil pressure signal through the control valve and enters the upper part of the speed regulating piston to push the speed regulating piston and the speed regulating piston rod to move downwards so as to compress the speed regulating spring, thereby stably controlling the rotating speed.
(3) When a plurality of diesel engines are used in parallel, the rotating speeds of the plurality of diesel engines can be synchronized by finely adjusting the feedback cam.
(4) The floating head is provided with a lever, and when no oil pressure exists in the speed regulating piston cylinder, the lever can be moved to adjust the position of the speed regulating piston, so that the speed regulating spring is compressed, and the purpose of controlling the rotating speed is achieved.
In conclusion, the invention can realize that the displacement signal is converted into oil pressure, then the rotating speed of the diesel engine is controlled by the oil pressure, and the invention is provided with a high-low limiting device and a feedback cam; when no oil pressure signal exists, the rotating speed can be controlled in a mechanical mode, so that the diesel engine system can run more stably and safely.
Drawings
FIG. 1 is one of the schematic structural diagrams of the novel speed regulating control device;
FIG. 2 is a second schematic diagram of the structure of the novel speed control device;
FIG. 3 is a working schematic diagram of the novel speed regulating control device;
in the figure: 1. the speed regulation device comprises a speed regulation spring, 2, a speed regulation piston cylinder, 3, a lever, 4, a floating head, 5, an inner hexagon screw, 6, a feedback connecting rod, 7, a second cylindrical pin, 8, a speed regulation piston, 9, a speed regulation piston rod, 10, a lowest rotation speed limit screw, 11, a feedback seat, 12, a first cylindrical pin, 13, a feedback cam, 14, a highest rotation speed limit screw, 15, a check valve, 16, a control valve spool, 17 and a slide valve.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, in this embodiment, a speed regulation control device includes a speed regulation spring 1, a speed regulation piston cylinder 2, a lever 3, a floating head 4, a feedback connecting rod 6, a speed regulation piston 8, a speed regulation piston rod 9, a minimum rotation speed limit screw 10, a feedback seat 11, a first cylindrical pin 12, a feedback cam 13, a maximum rotation speed limit screw 14, and a check valve 15, and the specific connection relationship is as follows:
the piston part of the speed regulating piston 8 slides and is in liquid seal with the speed regulating piston cylinder 2, and the rod part of the speed regulating piston 8 extends out of the speed regulating piston cylinder 2. The speed regulation piston rod 9 and the rod part of the speed regulation piston 8 are coaxially arranged and fixedly connected together. The floating head 4 is arranged at the upper end of the rod part of the speed regulating piston 8 and is fixedly connected with the rod part of the speed regulating piston 8. One end of the lever 3 is connected with the floating head 4; the other end of the lever 3 is used for connecting with a control valve spool 16 (see fig. 3), and the movement of the control valve spool 16 (see fig. 3) is driven by the movement of the lever 3, so that the oil pressure on the speed regulating piston 8 is controlled. One end of the feedback connecting rod 6 is connected with the floating head 4 through a first cylindrical pin 12, the other end of the feedback connecting rod 6 is used for being connected with the power piston, and the feedback connecting rod 6 is used for feeding back the position of the power piston. The feedback cam 13 is located below the first cylindrical pin 12, and the feedback cam 13 is connected with the first cylindrical pin 12. The feedback seat 11 is arranged on the upper end of the speed regulation piston rod 9, and the feedback seat 11 is positioned right below the feedback cam 13 and provides plane support for the feedback cam 13. The feedback connecting rod 6 is used for receiving the position of the power piston, transmitting the position to the feedback cam 13 through the first cylindrical pin 12, and feeding the position to the feedback seat 11 through the feedback cam 13, so that the position of the speed regulation piston rod 9 is adjusted. The speed regulating piston cylinder 2 receives control oil pressure to push the speed regulating piston 8 and the speed regulating piston rod 9 to move, and the control oil pressure is compared with the spring force of the speed regulating piston 1 to determine the moving directions of the speed regulating piston 8 and the speed regulating piston rod 9, so that the speed regulating piston 1 is compared with the slide valve 17 to control the rotation speed.
As shown in fig. 1 and fig. 2, in this embodiment, the speed regulation control device further includes a minimum rotation speed limit screw 10 disposed on the speed regulation piston cylinder 2, and a lower end of the minimum rotation speed limit screw 10 extends into the speed regulation piston cylinder 2.
As shown in fig. 1 and fig. 2, in the present embodiment, the speed regulation control device further includes a check valve 15 disposed on the speed regulation piston cylinder 2; a position, corresponding to the one-way valve 15, of the floating head 4 is provided with a maximum rotating speed limit screw 14.
When no oil pressure exists on the upper part of the speed regulating piston 8, the speed regulating piston 8 is propped by the lowest rotating speed limiting screw 10, and the lowest rotating speed of the diesel engine is set; when the oil pressure on the upper part of the speed regulating piston 8 is increased, the speed regulating piston 8 is pushed to move downwards, the speed regulating spring 1 is compressed, the rotating speed of the diesel engine is increased, when the rated rotating speed is reached, the highest rotating speed limiting screw 14 on the floating head 4 contacts the one-way valve 15, the one-way valve 15 is opened, and the redundant oil pressure on the upper part of the speed regulating piston 8 is drained to an oil pool, namely the highest rotating speed is determined by limiting the control oil pressure in the speed regulating piston cylinder 2.
In the present embodiment, as shown in fig. 1, one end of the lever 3 is connected to the floating head 4 through a second cylindrical pin 7.
As shown in fig. 1, in the present embodiment, the feedback cam 13 is connected to the first cylindrical pin 12 by a socket head cap screw 5.
In this embodiment, the lever 3 and the feedback link 6 are fixed on opposite sides (i.e. the end of the lever 3 not connected to the floating head 4 and the end of the feedback link 6 not connected to the floating head 4 are disposed in opposite directions), and the positions of the floating head 4 and the speed-regulating piston 8 are fixed, so that the position of the stop screw 14 with the highest rotation speed on the floating head 4 is aligned with the check valve 15, and the speed-regulating piston 8 and the speed-regulating spring 1 are prevented from rotating during operation. In the operation process, the control oil pressure is established by the up-and-down movement of the control valve, and then enters the inside of the speed regulation piston cylinder 2 to push the speed regulation piston 8, so that the speed regulation piston rod 9 is driven to move downwards to compress the speed regulation spring 1, and the rotating speed of the diesel engine is controlled stably.
In this embodiment, when a plurality of diesel engines are used in parallel, the feedback cam 13 can be finely adjusted to synchronize the rotation speeds of the plurality of diesel engines. When no oil pressure exists in the speed regulating piston cylinder 2, the lever 3 can be moved up and down to adjust the positions of the speed regulating piston 8 and the speed regulating piston rod 9, so that the speed regulating spring 1 is compressed, and the purpose of mechanically controlling the rotating speed is achieved.
The speed regulating spring 1 is compressed through controlling the oil pressure, so that the rotating speed is controlled, the rigidity of the speed regulating spring 1 of the medium and large diesel engines is often larger, the speed regulating spring needs to be pushed through the oil pressure, the control precision of the compression amount is high, and the oil pressure control is more accurate than that of the mechanical pressure speed regulating spring 1. Meanwhile, a lowest rotating speed limiting screw 11 is arranged to play a role in limiting the lowest rotating speed; a check valve 13 and a maximum rotation speed limit screw 14 are provided to play a role of limiting the maximum rotation speed thereof. In short, the speed regulation control device in the embodiment has the function of controlling the rotating speed by using the oil pressure, has high control precision and good stability, and is suitable for large and medium-sized diesel engines with high requirements and good reliability.
Claims (6)
1. A speed regulation control device is characterized in that: the device comprises a speed regulation spring (1), a speed regulation piston cylinder (2), a lever (3), a floating head (4), a feedback connecting rod (6), a speed regulation piston (8), a speed regulation piston rod (9), a feedback seat (11) and a feedback cam (13);
the piston part of the speed regulating piston (8) slides and is in liquid seal with the speed regulating piston cylinder (2), and the rod part of the speed regulating piston (8) extends out of the speed regulating piston cylinder (2);
the speed regulation piston rod (9) and the rod part of the speed regulation piston (8) are coaxially arranged and fixedly connected together;
the floating head (4) is arranged at the upper end of the rod part of the speed regulating piston (8) and is fixedly connected with the rod part of the speed regulating piston (8);
one end of the lever (3) is connected with the floating head (4); the other end of the lever (3) is used for being connected with a control valve spool (16), and the movement of the control valve spool (16) is driven by the movement of the lever (3) so as to control the oil pressure on the speed regulating piston (8);
one end of the feedback connecting rod (6) is connected with the floating head (4) through a first cylindrical pin (12), the other end of the feedback connecting rod (6) is used for being connected with the power piston, and the feedback connecting rod (6) is used for feeding back the position of the power piston;
the feedback cam (13) is positioned below the first cylindrical pin (12), and the feedback cam (13) is connected with the first cylindrical pin (12);
the feedback seat (11) is arranged at the upper end of the speed regulation piston rod (9), and the feedback seat (11) is positioned right below the feedback cam (13) and provides plane support for the feedback cam (13);
the feedback connecting rod (6) receives the position of the power piston, transmits the position to the feedback cam (13) through the first cylindrical pin (12), and feeds back the position to the feedback seat (11) through the feedback cam (13), so that the position of the speed regulation piston rod (9) is adjusted;
the speed regulating piston (8) and the speed regulating piston rod (9) are pushed to move by receiving control oil pressure in the speed regulating piston cylinder (2), the movement directions of the speed regulating piston (8) and the speed regulating piston rod (9) are determined by comparing the control oil pressure with the spring force of the speed regulating piston (1), and therefore the speed regulating piston (1) and the slide valve (17) are controlled to move to control the rotating speed.
2. The speed-regulation control device according to claim 1, characterized in that: the speed-regulating piston cylinder (2) is provided with a check valve (15); the floating head (4) is provided with a highest rotating speed limiting screw (14) at a position corresponding to the one-way valve (15), when the highest rotating speed is reached, the highest rotating speed limiting screw (14) on the floating head (4) contacts the one-way valve (15), the one-way valve (15) is opened, redundant oil pressure in the speed regulating piston cylinder (2) is removed, and the highest rotating speed is determined by limiting the control oil pressure in the speed regulating piston cylinder (2).
3. A speed control apparatus according to claim 1 or 2, wherein: the diesel engine speed regulation device is characterized by further comprising a lowest rotation speed limiting screw (10) arranged on the speed regulation piston cylinder (2), wherein the lower end of the lowest rotation speed limiting screw (10) extends into the speed regulation piston cylinder (2), and when no oil pressure exists on the upper portion of a piston portion of the speed regulation piston (8), the speed regulation piston (8) is propped against through the lowest rotation speed limiting screw (10) so as to set the lowest rotation speed of the diesel engine.
4. A speed control apparatus according to claim 3, wherein: the lever (3) and the feedback connecting rod (6) are arranged in opposite sides.
5. A speed control device according to claim 1, 2 or 4, characterized in that: one end of the lever (3) is connected with the floating head (4) through a second cylindrical pin (7).
6. The speed control device according to claim 5, characterized in that: the feedback cam (13) is connected with the first cylindrical pin (12) through a socket head cap screw (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111171826.0A CN113756964B (en) | 2021-10-08 | 2021-10-08 | Speed regulation control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111171826.0A CN113756964B (en) | 2021-10-08 | 2021-10-08 | Speed regulation control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113756964A true CN113756964A (en) | 2021-12-07 |
| CN113756964B CN113756964B (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111171826.0A Active CN113756964B (en) | 2021-10-08 | 2021-10-08 | Speed regulation control device |
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| Country | Link |
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| CN (1) | CN113756964B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810363A (en) * | 2022-04-13 | 2022-07-29 | 重庆红江机械有限责任公司 | Electro-hydraulic speed regulator electromagnetic servo mechanism |
| CN114856834A (en) * | 2022-04-22 | 2022-08-05 | 重庆红江机械有限责任公司 | Pneumatic and manual dual-purpose speed regulating mechanism of electro-hydraulic speed regulator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU819377A1 (en) * | 1979-05-17 | 1981-04-07 | Уральское Отделение Всесоюзногоордена Трудового Красного Знаменинаучно-Исследовательского Институтажелезнодорожного Транспорта | Indirect-action speed controller |
| CN200985830Y (en) * | 2006-12-19 | 2007-12-05 | 资阳晨风精密机械有限责任公司 | Full system type fluid pressure governor |
| CN201025133Y (en) * | 2007-04-27 | 2008-02-20 | 重庆红江机械厂 | A hydraulic pressure speed adjustor for diesel engine |
| JP2015190362A (en) * | 2014-03-28 | 2015-11-02 | ヤンマー株式会社 | Link mechanism assembly of hydraulic governor, and method of assembling link mechanism of hydraulic governor |
| CN105604705A (en) * | 2016-01-11 | 2016-05-25 | 重庆红江机械有限责任公司 | Dynamic displacement feedback adjusting type hydraulic speed regulator |
-
2021
- 2021-10-08 CN CN202111171826.0A patent/CN113756964B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU819377A1 (en) * | 1979-05-17 | 1981-04-07 | Уральское Отделение Всесоюзногоордена Трудового Красного Знаменинаучно-Исследовательского Институтажелезнодорожного Транспорта | Indirect-action speed controller |
| CN200985830Y (en) * | 2006-12-19 | 2007-12-05 | 资阳晨风精密机械有限责任公司 | Full system type fluid pressure governor |
| CN201025133Y (en) * | 2007-04-27 | 2008-02-20 | 重庆红江机械厂 | A hydraulic pressure speed adjustor for diesel engine |
| JP2015190362A (en) * | 2014-03-28 | 2015-11-02 | ヤンマー株式会社 | Link mechanism assembly of hydraulic governor, and method of assembling link mechanism of hydraulic governor |
| CN105604705A (en) * | 2016-01-11 | 2016-05-25 | 重庆红江机械有限责任公司 | Dynamic displacement feedback adjusting type hydraulic speed regulator |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810363A (en) * | 2022-04-13 | 2022-07-29 | 重庆红江机械有限责任公司 | Electro-hydraulic speed regulator electromagnetic servo mechanism |
| CN114810363B (en) * | 2022-04-13 | 2023-03-31 | 重庆红江机械有限责任公司 | Electro-hydraulic speed regulator electromagnetic servo mechanism |
| CN114856834A (en) * | 2022-04-22 | 2022-08-05 | 重庆红江机械有限责任公司 | Pneumatic and manual dual-purpose speed regulating mechanism of electro-hydraulic speed regulator |
| CN114856834B (en) * | 2022-04-22 | 2023-06-27 | 重庆红江机械有限责任公司 | Pneumatic and manual dual-purpose speed regulating mechanism of electrohydraulic speed regulator |
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| Publication number | Publication date |
|---|---|
| CN113756964B (en) | 2023-05-23 |
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