CN115750902B - Two-dimensional electro-hydraulic proportional valve manual unloading structure for quick self-locking jack - Google Patents
Two-dimensional electro-hydraulic proportional valve manual unloading structure for quick self-locking jack Download PDFInfo
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- CN115750902B CN115750902B CN202211505512.4A CN202211505512A CN115750902B CN 115750902 B CN115750902 B CN 115750902B CN 202211505512 A CN202211505512 A CN 202211505512A CN 115750902 B CN115750902 B CN 115750902B
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Abstract
The invention discloses a manual unloading structure of a two-dimensional electro-hydraulic proportional valve for a quick self-locking jack, which comprises a two-dimensional electro-hydraulic proportional valve, an inner rotor motor, an axial manual zero setting assembly and a radial manual zero setting assembly, wherein the inner rotor motor is fixed at the right end of the two-dimensional electro-hydraulic proportional valve; the axial manual zero setting assembly comprises an axial zero setting nut, an axial return spring, a thrust ball bearing and an axial spring seat; the radial manual zero setting assembly comprises a radial zero setting nut, a rotary positioning spring seat, a rotary return spring and a radial spring positioning pin. According to the invention, linear displacement of the valve core is detected through LVDT sensing, zero position is realized through the axial manual zero setting component and the radial manual zero setting component, and when no oil pressure or pressure blockage of the system is present and oil leakage is impossible, system pressure guiding is realized through the axial zero setting nut.
Description
[ field of technology ]
The invention relates to the technical field of two-dimensional electro-hydraulic proportional valves, in particular to the technical field of a manual unloading structure of a two-dimensional electro-hydraulic proportional valve for a quick self-locking jack.
[ background Art ]
The hydraulic jack is widely applied to lifting and supporting of large-scale equipment and has great significance for guaranteeing lifting construction safety of the large-scale equipment. Because the traditional hydraulic jack needs to support the heavy object for a long time by oil pressure during lifting construction, the safety risk of unstability of the load object caused by sudden failure of the jack exists, and a mechanical screw jack is usually selected for the lifting process, so that a large amount of manpower and equipment resources are consumed. The quick self-locking jack can solve the technical problems, and the safety of the jack can be further improved by adding the manual control device.
The electrohydraulic proportional valve is a key element in electrohydraulic proportional control, and is a hydraulic control valve which receives analog electric signals and outputs modulated flow and pressure correspondingly. The electro-hydraulic proportional valve has the advantages of quick dynamic response, high control precision, long service life and the like, and is widely applied to electro-hydraulic proportional control systems in the fields of aviation, aerospace, ships, metallurgy, chemical industry and the like.
The external rotor motor has simple structure, small axial size and high specific power, can control torque in a very wide speed range, has high response speed, and has higher efficiency because of no speed reducer. Therefore, the characteristics of the external rotor motor can be utilized for controlling the electro-hydraulic proportional valve. During the frequent and rapid opening and closing of the valve spool, axial movement occurs. When the high-pressure oil passes through the T port, the pressure of the sensitive cavity is insufficient, so that the valve core is blocked, and meanwhile, the A, B cavity of the corresponding oil cylinder is full of oil, and oil drainage is needed.
In order to ensure that the quick self-locking jack runs more reliably, the electro-hydraulic proportional valve can realize system pressure guiding when the system is free from oil pressure or pressure blockage and can not drain oil, and a purely mechanical manual control device is additionally arranged on the basis of not changing the working performance of the electro-hydraulic proportional valve, so that the loss caused by forced outage due to the fact that the quick self-locking jack is free from oil pressure or pressure blockage and can not drain oil can be avoided, and maintenance personnel can conveniently maintain in time.
[ invention ]
The invention aims to solve the problems in the prior art, and provides a two-dimensional electro-hydraulic proportional valve manual unloading structure for a quick self-locking jack, which can push an axial spring seat through a manual adjusting bolt so as to drive a motor shaft and a valve core to axially move and complete system pressure guiding. The invention adopts linear displacement sensing detection to avoid dead zone of angular displacement detection.
In order to achieve the aim, the invention provides a manual unloading structure of a two-dimensional electro-hydraulic proportional valve for a quick self-locking jack, which comprises a two-dimensional electro-hydraulic proportional valve, an inner rotor motor, an axial manual zero setting assembly and a radial manual zero setting assembly, wherein the inner rotor motor is fixed at the right end of the two-dimensional electro-hydraulic proportional valve;
the inner rotor motor comprises a motor front end cover, a motor stator shell and a motor rear end cover which are sequentially fixed at the right end of the valve body, and also comprises a motor shaft connected to the right end of the valve core, a rotor silicon steel sheet sleeved on the motor shaft, a rotor silicon steel sleeved outside the silicon steel sheet, a rotor cover sleeved on the motor front end cover and the motor rear end cover, and a stator winding fixed in an inner cavity of the motor stator shell, wherein the stator winding is positioned outside the rotor cover;
the axial manual zero setting assembly comprises an axial zero setting nut, an axial return spring, a thrust ball bearing and an axial spring seat, wherein the number of the thrust ball bearings is 2 in interference fit on the outer peripheral surface of a motor shaft, the number of the axial return springs is 2 in clearance fit on the outer peripheral surface of the motor shaft, the right end surface of the thrust ball bearing on the left side and the left end surface of the thrust ball bearing on the right side are respectively propped against the left side and the right side of the rotor silicon steel sheet, the left end surface of the thrust ball bearing on the left side is propped against the right end surface of the axial return spring on the left side, the left end surface of the axial return spring on the left side is propped against the inner cavity shoulder of the motor front end cover, the right end surface of the thrust ball bearing on the right side is propped against the left end surface of the axial return spring on the right side, and the inner cavity shoulder of the axial spring seat is sleeved on the motor shaft; an axial zero-setting nut is transversely and leftwards screwed on the right end face of the rear end cover of the motor, and the left end face of the axial zero-setting nut is propped against the right end face of the axial spring seat;
the radial manual zero setting assembly comprises a radial zero setting nut, a rotary positioning spring seat, a rotary reset spring and a radial spring positioning pin, wherein the rotary positioning spring seat is fixed at the right end of the motor shaft, the radial spring positioning pin is longitudinally embedded in the upper and lower symmetrical mode of the rotary positioning spring seat, and the rotary reset spring is sleeved on the radial spring positioning pin; the front side surface and the back side surface of the right part of the motor rear end cover are vertically symmetrically and longitudinally matched with radial zero-setting nuts, the tail ends of the radial zero-setting nuts are matched with rotary reset springs, and the rotary reset springs are pre-tightened through the radial zero-setting nuts.
Preferably, the two-dimensional electro-hydraulic proportional valve further comprises a valve core left plug embedded in the left part of the valve core inner cavity, concentric rings sleeved on the periphery of the valve core, and a valve core right plug embedded in the right part of the valve core inner cavity.
Preferably, the right end of the valve core is fixed with a motor shaft through an interference pin. The valve core right-hand member is vertical to be equipped with first location through-hole, and the motor shaft left part is the step shaft and the motor shaft left part is vertical to be equipped with the second location through-hole, and the motor shaft left part inserts in the valve core right-hand member cavity and interference pin interference fit is advanced in first location through-hole, the second location through-hole.
Preferably, the left end of the left end cover is fixedly provided with an LVDT main body through a bolt, an LVDT sensing core is transversely embedded in the LVDT main body, the right end of the LVDT sensing core is in threaded fit with an LVDT sensing core joint, the right end of the LVDT sensing core joint is in threaded fit with a valve core left plug, and the valve core left plug is embedded in the left part of an inner cavity of the valve core.
Preferably, the right end of the motor shaft is fixedly provided with a rotary positioning spring seat through a bolt, the right end of the motor shaft is provided with an internal threaded hole, an inner cavity of the rotary positioning spring seat is provided with an annular plate, and the bolt passes through the annular plate and is fixed in the internal threaded hole of the motor shaft through threads.
Preferably, pin fixing seats are symmetrically arranged at the right end of the rotary positioning spring seat up and down, round through holes are longitudinally formed in the pin fixing seats, and spring positioning pins are in interference fit in the round through holes.
The invention has the beneficial effects that: according to the invention, linear displacement of the valve core is detected through LVDT sensing, zero position is realized through the axial manual zero setting component and the radial manual zero setting component, and when no oil pressure or pressure blockage of the system is present and oil leakage is impossible, system pressure guiding is realized through the axial zero setting nut.
The features and advantages of the present invention will be described in detail by way of example with reference to the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a perspective view of a manual unloading structure of a two-dimensional electro-hydraulic proportional valve for a quick self-locking jack of the present invention;
FIG. 2 is a front cross-sectional view of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve for the quick self-locking jack of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2 in accordance with the present invention;
FIG. 4 is a top cross-sectional view of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve facing the quick self-locking jack of the present invention;
FIG. 5 is a perspective view of the LVDT body of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve of the present invention for a quick self-locking jack;
FIG. 6 is a perspective view of a valve body of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve facing the quick self-locking jack of the invention;
FIG. 7 is an oblique cross-sectional view of a valve body of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve facing the quick self-locking jack of the invention;
FIG. 8 is a perspective view of a motor front end cover of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve facing the quick self-locking jack;
FIG. 9 is a perspective view of the motor stator housing of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve facing the quick self-locking jack of the present invention;
FIG. 10 is a perspective view I of a motor rear end cover of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve facing the quick self-locking jack;
FIG. 11 is a perspective view II of a motor rear end cover of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve facing the quick self-locking jack;
FIG. 12 is a perspective view of the left end cap of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve facing the quick self-locking jack of the present invention;
FIG. 13 is a perspective view of a valve sleeve of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve facing the quick self-locking jack of the present invention;
FIG. 14 is a perspective view of a valve core of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve facing the quick self-locking jack of the invention;
FIG. 15 is a perspective view of a motor shaft of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve for a quick self-locking jack of the present invention;
FIG. 16 is a perspective view of an axial spring seat of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve facing the quick self-locking jack of the present invention;
FIG. 17 is a perspective view of a rotary positioning spring seat of the manual unloading structure of the two-dimensional electro-hydraulic proportional valve facing the quick self-locking jack.
In the figure: 1-LVDT main body, 2-valve body, 201-oil inlet (P port), 202-working oil inlet (A port), 203-oil return port (T port), 204-working oil return port (B port), 3-motor front end cover, 4-motor stator housing, 5-motor rear end cover, 6-radial zero setting nut, 7-axial zero setting nut, 8-left end cover, 9-LVDT induction core, 10-LVDT induction core joint, 11-valve sleeve, 1101-round key slot, 1102-valve sleeve first high pressure hole, 1103-valve sleeve first working hole, 1104-valve sleeve low pressure hole, 1105-valve sleeve second working hole, 1106-valve sleeve second high pressure hole, 12-valve sleeve 1201-first positioning through hole, 1202-low pressure hole sink, 1203-high pressure hole sink, 1204-low pressure hole, 1205-high pressure through hole, 13-spool left plug, 14-concentric ring, 15-spool right plug, 16-interference pin, 17-motor shaft, 1701-second positioning through hole, 18-axial return spring, 19-thrust ball bearing, 20-rotor silicon steel sheet, 21-rotor silicon steel, 22-rotor cover, 23-stator winding, 24-axial spring seat, 25-rotational positioning spring seat, 2501-annular plate, 2502-pin fixing seat, 26-rotational return spring, 27-radial spring positioning pin.
[ detailed description ] of the invention
The terms "first," "second," and the like in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
Referring to fig. 1-17, the invention comprises a two-dimensional electro-hydraulic proportional valve, an inner rotor motor, an axial manual zero setting component and a radial manual zero setting component, wherein the inner rotor motor is fixed at the right end of the two-dimensional electro-hydraulic proportional valve, and the two-dimensional electro-hydraulic proportional valve comprises a valve body 2, a left end cover 8 fixed at the left end of the valve body 2, a valve sleeve 11 embedded in the valve body 2 and a valve core 12 embedded in the valve sleeve 11;
the inner rotor motor comprises a motor front end cover 3, a motor stator shell 4 and a motor rear end cover 5 which are sequentially fixed at the right end of the valve body 2, and further comprises a motor shaft 17 connected to the right end of the valve core 12, a rotor silicon steel sheet 20 sleeved on the motor shaft 17, a rotor silicon steel 21 sleeved outside the silicon steel sheet 20, a rotor cover 22 sleeved on the motor front end cover 3 and the motor rear end cover 5, and a stator winding 23 fixed in the inner cavity of the motor stator shell 4, wherein the stator winding 23 is positioned outside the rotor cover 22, and the rotor cover 22 is positioned outside the rotor silicon steel 21;
the axial manual zero setting assembly comprises an axial zero setting nut 7, an axial return spring 18, a thrust ball bearing 19 and an axial spring seat 24, wherein the number of the thrust ball bearings 19 which are 2 are in interference fit on the outer peripheral surface of a motor shaft 17, the number of the axial return springs 18 which are 2 are in clearance fit on the outer peripheral surface of the motor shaft 17, the right end surface of the thrust ball bearing 19 on the left side and the left end surface of the thrust ball bearing 19 on the right side are respectively abutted against the left side surface and the right side surface of the rotor silicon steel sheet 20, the left end surface of the thrust ball bearing 19 on the left side is abutted against the right end surface of the axial return spring 18 on the left side, the left end surface of the axial return spring 18 on the left side is abutted against the inner cavity shoulder of the motor front end cover 3, the right end surface of the thrust ball bearing 19 on the right side is abutted against the left end surface of the axial return spring seat 18 on the right side, and the axial spring seat 24 is sleeved on the motor shaft 17; an axial zero-setting nut 7 is transversely and leftwards screwed on the right end face of the motor rear end cover 5, and the left end face of the axial zero-setting nut 7 abuts against the right end face of an axial spring seat 24;
the radial manual zero setting assembly comprises a radial zero setting nut 6, a rotary positioning spring seat 25, a rotary return spring 26 and a radial spring positioning pin 27, wherein the rotary positioning spring seat 25 is fixed at the right end of the motor shaft 17, the radial spring positioning pin 27 is longitudinally embedded in the upper and lower symmetry of the rotary positioning spring seat 25, and the rotary return spring 26 is sleeved on the radial spring positioning pin 27; the radial zero-setting nut 6 is vertically symmetrically and longitudinally screwed on the front side surface and the rear side surface of the right part of the motor rear end cover 5, the tail end of the radial zero-setting nut 6 is matched with the rotary return spring 26, and the rotary return spring 26 is pre-tightened through the radial zero-setting nut 6.
Specifically, the two-dimensional electro-hydraulic proportional valve further comprises a valve core left plug 13 embedded in the left part of the inner cavity of the valve core 12, concentric rings 14 sleeved on the periphery of the valve core 12, and a valve core right plug 15 embedded in the right part of the inner cavity of the valve core 12.
Specifically, the right end of the valve core 12 is fixed with a motor shaft 17 through an interference pin 16. The right end of the valve core 12 is vertically provided with a first positioning through hole 1201, the left part of the motor shaft 17 is a stepped shaft, the left part of the motor shaft 17 is vertically provided with a second positioning through hole 1701, the left part of the motor shaft 17 is inserted into a cavity at the right end of the valve core 12, and the interference pin 16 is in interference fit into the first positioning through hole 1201 and the second positioning through hole 1701.
Specifically, the left end of the left end cover 8 is fixedly provided with an LVDT main body 1 through bolts, an LVDT sensing core 9 is transversely embedded in the LVDT main body 1, the right end of the LVDT sensing core 9 is in threaded fit with an LVDT sensing core joint 10, the right end of the LVDT sensing core joint 10 is in threaded fit with a valve core left plug 13, and the valve core left plug 13 is embedded in the left part of an inner cavity of the valve core 12.
Specifically, the right end of the motor shaft 17 is fixed with a rotary positioning spring seat 25 through a bolt, the right end of the motor shaft 17 is provided with an internal threaded hole, an inner cavity of the rotary positioning spring seat 25 is provided with an annular plate 2501, and the bolt passes through the annular plate 2501 and is fixed in the internal threaded hole of the motor shaft 17 in a threaded manner.
Specifically, the right end of the rotary positioning spring seat 25 is provided with a pin fixing seat 2502 vertically symmetrically, the pin fixing seat 2502 is longitudinally provided with a circular through hole, and a spring positioning pin 27 is in interference fit with the circular through hole.
The working process of the invention comprises the following steps:
the invention discloses a two-dimensional electro-hydraulic proportional valve manual unloading structure for a quick self-locking jack, which is described with reference to the accompanying drawings in the working process.
The structure of the two-dimensional electro-hydraulic proportional valve has been related to in the previous patents of the team of the application, and is different in that the right end of the valve core 12 of the two-dimensional electro-hydraulic proportional valve in the application is fixedly connected with a motor shaft 17, the valve core 12 and the motor shaft 17 are integrated, and the application can adjust the axial zero position through an axial manual zero setting assembly and adjust the radial zero position through a radial manual zero setting assembly.
The valve is a half bridge, and the valve core 12 is provided with high and low pressure holes, and can move when the pressure changes. The axial reset is realized by adopting a symmetrical axial reset spring 18 and thrust ball bearing 19 combination. The rotary zeroing is to adjust the elastic force of the rotary return spring 26 by using the radial zeroing nut 6, so as to adjust the displacement of the rotary positioning spring seats and 25 to adjust the zeroing angle. The axial zeroing nut 7 is propped against the axial spring seat 24, the axial spring seat 24 compresses the axial return spring 18, the compression force of the axial return spring 18 acts on the thrust ball bearing 19, the thrust ball bearing 19 is in interference fit on the motor shaft 17, and accordingly the motor shaft 17 is driven to axially move, and axial zeroing can be achieved.
Another effect of the axial zeroing nut 7 in the present application is that in certain situations, the commutation can be achieved by directly adjusting the axial zeroing nut 7, enabling a manual direct control. For example, when the P-chamber and the T-chamber are simultaneously at low pressure, a pressure difference cannot be established by rotating the valve core and pushing the valve core to axially move, and at this time, the motor loses the driving function. At this time, if the A, B cavity of the valve-controlled oil cylinder is filled with oil, the oil cylinder cannot be reset by discharging oil through the motor-driven valve core. By manually rotating the axial zero-setting nut 7, the valve core 12 can be pushed to realize axial micro-motion, for example, 0.1-0.2mm, the cavity A or the cavity B is communicated with the cavity T, oil discharge is realized, and the oil cylinder is reset.
When the H-shaped oil port is at the middle position, all oil ports are fully opened, and when the system has no oil pressure, the pressure can be conducted through a manual control bolt.
Under the prior art, the rotor cover 22 of the motor can be a sleeve made of titanium alloy, and even the pressure oil leaked from the valve body can be propped against the sleeve.
The angular displacement sensing detection has a certain dead zone; the linear displacement is detected by the LVDT sensor, and the linear displacement is directly measured by the linear displacement sensor without dead zones.
The above embodiments are illustrative of the present invention, and not limiting, and any simple modifications of the present invention fall within the scope of the present invention.
Claims (6)
1. Manual unloading structure of two-dimensional electro-hydraulic proportional valve towards quick auto-lock jack, its characterized in that: the two-dimensional electro-hydraulic proportional valve comprises a valve body (2), a left end cover (8) fixed at the left end of the valve body (2), a valve sleeve (11) embedded in the valve body (2) and a valve core (12) embedded in the valve sleeve (11);
the inner rotor motor comprises a motor front end cover (3), a motor stator shell (4) and a motor rear end cover (5) which are sequentially fixed at the right end of a valve body (2), and further comprises a motor shaft (17) connected to the right end of a valve core (12), a rotor silicon steel sheet (20) sleeved on the motor shaft (17), a rotor silicon steel sheet (21) sleeved outside the silicon steel sheet (20), a rotor cover (22) sleeved on the motor front end cover (3) and the motor rear end cover (5), and a stator winding (23) fixed in the inner cavity of the motor stator shell (4), wherein the stator winding (23) is positioned outside the rotor cover (22), and the rotor cover (22) is positioned outside the rotor silicon steel sheet (21);
the axial manual zero setting assembly comprises an axial zero setting nut (7), an axial return spring (18), a thrust ball bearing (19) and an axial spring seat (24), wherein the number of the thrust ball bearings (19) which are 2 are in interference fit on the outer peripheral surface of a motor shaft (17), the number of the axial return springs (18) which are 2 are in clearance fit on the outer peripheral surface of the motor shaft, the right end surface of the thrust ball bearing (19) on the left side and the left end surface of the thrust ball bearing (19) on the right side are respectively propped against the left side and the right side of a rotor silicon steel sheet (20), the left end surface of the thrust ball bearing (19) on the left side is propped against the right end surface of the axial return spring (18) on the left side, the left end surface of the thrust ball bearing (19) on the right side is propped against the left end surface of the axial return spring seat (24) on the right side, and the axial spring seat (24) is sleeved on the inner cavity shoulder of the motor shaft (17); an axial zero-setting nut (7) is transversely and leftwards screwed on the right end face of the motor rear end cover (5), and the left end face of the axial zero-setting nut (7) is propped against the right end face of an axial spring seat (24);
the radial manual zero setting assembly comprises a radial zero setting nut (6), a rotary positioning spring seat (25), a rotary return spring (26) and a radial spring positioning pin (27), wherein the rotary positioning spring seat (25) is fixed at the right end of the motor shaft (17), the radial spring positioning pin (27) is longitudinally embedded in the upper and lower symmetry of the rotary positioning spring seat (25), and the rotary return spring (26) is sleeved on the radial spring positioning pin (27); the motor rear end cover (5) is characterized in that radial zero-setting nuts (6) are vertically symmetrically and longitudinally screwed on the front side surface and the rear side surface of the right part of the motor rear end cover (5), the tail ends of the radial zero-setting nuts (6) are matched with rotary return springs (26), and the rotary return springs (26) are pre-tightened through the radial zero-setting nuts (6).
2. The two-dimensional electro-hydraulic proportional valve manual unloading structure for a quick self-locking jack as claimed in claim 1, wherein: the two-dimensional electro-hydraulic proportional valve further comprises a valve core left plug (13) embedded in the left part of the inner cavity of the valve core (12), concentric rings (14) sleeved on the periphery of the valve core (12), and a valve core right plug (15) embedded in the right part of the inner cavity of the valve core (12).
3. The two-dimensional electro-hydraulic proportional valve manual unloading structure for a quick self-locking jack as claimed in claim 1, wherein: the valve core (12) right-hand member is fixed with motor shaft (17) through interference round pin (16), valve core (12) right-hand member is vertical to be equipped with first location through-hole (1201), and motor shaft (17) left part is the step shaft and motor shaft (17) left part is vertical to be equipped with second location through-hole (1701), and in valve core (12) right-hand member cavity and interference round pin (16) interference fit advanced first location through-hole (1201), second location through-hole (1701) are inserted in motor shaft (17) left part.
4. The two-dimensional electro-hydraulic proportional valve manual unloading structure for a quick self-locking jack as claimed in claim 1, wherein: the left end of the left end cover (8) is fixedly provided with an LVDT main body (1) through a bolt, an LVDT sensing core (9) is transversely embedded in the LVDT main body (1), an LVDT sensing core joint (10) is in threaded fit with the right end of the LVDT sensing core (9), a valve core left plug (13) is in threaded fit with the right end of the LVDT sensing core joint (10), and the valve core left plug (13) is embedded in the left part of an inner cavity of the valve core (12).
5. The two-dimensional electro-hydraulic proportional valve manual unloading structure for a quick self-locking jack as claimed in claim 1, wherein: the right end of the motor shaft (17) is fixedly provided with a rotary positioning spring seat (25) through a bolt, the right end of the motor shaft (17) is provided with an internal threaded hole, an inner cavity of the rotary positioning spring seat (25) is provided with an annular plate (2501), and the bolt is threaded and fixed in the internal threaded hole of the motor shaft (17) after passing through the annular plate (2501).
6. The two-dimensional electro-hydraulic proportional valve manual unloading structure for a quick self-locking jack as claimed in claim 1, wherein: the right end of the rotary positioning spring seat (25) is provided with a pin fixing seat (2502) in an up-down symmetry mode, a round through hole is longitudinally formed in the pin fixing seat (2502), and a spring positioning pin (27) is in interference fit with the round through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211505512.4A CN115750902B (en) | 2022-11-29 | 2022-11-29 | Two-dimensional electro-hydraulic proportional valve manual unloading structure for quick self-locking jack |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211505512.4A CN115750902B (en) | 2022-11-29 | 2022-11-29 | Two-dimensional electro-hydraulic proportional valve manual unloading structure for quick self-locking jack |
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| CN115750902A CN115750902A (en) | 2023-03-07 |
| CN115750902B true CN115750902B (en) | 2023-06-09 |
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- 2022-11-29 CN CN202211505512.4A patent/CN115750902B/en active Active
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| CN115750902A (en) | 2023-03-07 |
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