CN110625558A - Portable hydraulic wrench with adjustable torque - Google Patents
Portable hydraulic wrench with adjustable torque Download PDFInfo
- Publication number
- CN110625558A CN110625558A CN201910947526.3A CN201910947526A CN110625558A CN 110625558 A CN110625558 A CN 110625558A CN 201910947526 A CN201910947526 A CN 201910947526A CN 110625558 A CN110625558 A CN 110625558A
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- Prior art keywords
- oil
- port
- seat
- piston rod
- pipe
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Actuator (AREA)
Abstract
The invention discloses a portable torque-adjustable hydraulic wrench, which comprises an oil tank, a power cylinder, a plunger power pump, a torque conversion mechanism, a reversing valve, an overflow valve and a manual driving component, wherein the reversing valve is provided with a first port and a second port, the hydraulic control system comprises a first port, a second port and a fifth port, wherein the first port, the second port and the third port of a reversing valve are respectively and correspondingly connected with a first oil pipe, a second oil pipe and a third oil pipe; so set up, intensity of labour that can greatly reduced maintainer improves work efficiency.
Description
Technical Field
The invention relates to a portable hydraulic wrench with adjustable torque.
Background
At present, railway maintenance personnel and pipeline maintenance personnel are often required to disassemble and fasten railway track bolts and pipeline connecting flanges when carrying out long-distance field line patrol operation. Because the bolt generally has larger tightening torque, the field operation does not have energy guarantees such as power supply and the like, the bolt can only be manually tightened by a wrench and a stressing rod, the labor intensity is high, and the working efficiency is low.
Disclosure of Invention
The invention aims to overcome the defects and provide a portable hydraulic wrench with adjustable torque.
In order to achieve the purpose, the invention adopts the following specific scheme:
a portable torque-adjustable hydraulic wrench comprises an oil tank, a power cylinder, a plunger power pump, a torque conversion mechanism, a reversing valve, an overflow valve and a manual driving component, wherein the power cylinder, the plunger power pump, the reversing valve and the overflow valve are all arranged in the oil tank, a piston rod of the power cylinder penetrates through the lower end of the oil tank and is in transmission connection with the torque conversion mechanism, a piston rod of the plunger power pump penetrates through the upper end of the oil tank and is connected with the manual driving component, the reversing valve is provided with a first port, a second port, a third port, a fourth port and a fifth port, the first port, the second port and the third port of the reversing valve are respectively and correspondingly connected with a first oil pipe, a second oil pipe and a third oil pipe, the fourth port is communicated with the oil tank, the other ends of the first oil pipe and the second oil pipe are connected with a rodless cavity of the power cylinder after being connected with each, the valve core of the reversing valve is used for switching the working states of a first port and a second port, the rod cavity of the power cylinder is connected with the other end of the first oil pipe, the rodless cavity of the plunger power pump is connected with an oil inlet pipe and an oil outlet pipe, the oil inlet pipe and the oil outlet pipe are respectively provided with a one-way valve, the directions of the two one-way valves are opposite, the other end of the oil inlet pipe is communicated with the inside of the oil tank, the overflow valve is provided with an oil inlet, a first oil outlet and a second oil outlet, the other end of the oil outlet pipe is connected with the oil inlet of the overflow valve, the fifth port of the reversing valve is connected with the first oil outlet of the overflow valve, the oil inlet of the overflow valve is communicated with the first oil outlet, an overflow valve core is arranged between the oil inlet of the overflow valve and the second oil outlet of the overflow valve, the second oil, and the torque conversion mechanism is fixed at the lower end of the oil tank and is used for converting the linear thrust or the linear tension of the piston rod of the power oil cylinder into a rotary torque.
The torque conversion mechanism comprises a holding tube seat, a rotation connection assembly, a spiral conversion head and a torque head, wherein one end of the holding tube seat is fixed at the lower end of the oil tank corresponding to the power oil cylinder, the rotation connection assembly and the spiral conversion head are arranged in the holding tube seat, one end of the rotation connection assembly is hinged to a piston rod of the power oil cylinder, the other end of the rotation connection assembly is hinged to the spiral conversion head, the other end of the spiral conversion head extends out of the other end of the holding tube seat, the torque head is fixed at the other end of the spiral conversion head, three parallel thread grooves are formed in the spiral conversion head, a steel ball is movably embedded in each thread groove, the steel ball is located at the other end of the spiral conversion head, and the steel ball is further movably embedded in the holding tube seat.
Wherein, rotation coupling assembling includes bearing frame, conversion bearing and connecting axle, conversion bearing locates in the bearing frame, the one end of connecting axle and conversion bearing's inner circle cooperation, the bearing frame is articulated with power cylinder's piston rod, the other end and the spiral conversion head of connecting axle are articulated.
Wherein, manual drive part includes handle seat, oil pump lever, articulated seat and spring, the handle seat is fixed on the oil tank, the handle seat is equipped with the swing hole of fuel feeding pump lever wobbling, articulated seat is located between the piston rod of handle seat and plunger power pump, fixes on the oil tank, the one end of oil pump lever is passed behind the swing hole and is articulated with the piston rod of plunger power pump, the oil pump lever is still articulated through articulated piece and articulated seat, the both ends of spring are connected respectively on the other end of oil pump lever and handle seat.
The overflow valve is also provided with a pressure adjusting button, and the pressure adjusting button is used for adjusting the withstand pressure of the overflow valve core.
The invention has the beneficial effects that: so set up, can let maintainer act on the plunger power pump through manual drive part, make the plunger power pump for power cylinder pump sending hydraulic oil, then power cylinder realizes stretching out and withdraws the switching of action under the effect of switching-over valve, convert power cylinder's straight line thrust or straight line pulling force into rotation torque through the torque conversion mechanism simultaneously, and then can export bigger moment of torsion, thereby realize fastening and the dismantlement of railway bolt or pipeline flange, greatly reduced maintainer's intensity of labour, improve work efficiency, and small, light in weight, and is convenient for carry, manual operation, do not receive the external condition restriction.
Drawings
FIG. 1 is a schematic structural diagram of a hydraulic wrench according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a hydraulic wrench according to another perspective provided by an embodiment of the present invention;
FIG. 3 is a state diagram of a hydraulic wrench according to an embodiment of the present invention with a screw conversion head extended during use;
FIG. 4 is a state diagram of a hydraulic wrench according to an embodiment of the present invention with a screw conversion head retracted during use;
FIG. 5 is a schematic structural diagram of a torque conversion mechanism provided in an embodiment of the invention;
FIG. 6 is a schematic structural diagram of a spiral conversion head and a steel ball provided by an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a rotational coupling assembly provided by an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a diverter valve provided in accordance with an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a relief valve provided in an embodiment of the present invention;
description of reference numerals: 1-an oil tank; 2-a power cylinder; 3-plunger power pump; 41-holding tube seat; 42-a rotating connection assembly; 421-a bearing seat; 422-conversion bearing; 423-connecting shaft; 43-a helical conversion head; 431-thread groove; 44-torque head; 45-steel balls; 5-a reversing valve; 51-a first port; 52-a second port; 53-third port; 54-a fourth port; 55-fifth port; 6-overflow valve; 61-an oil inlet; 62-a first oil outlet; 63-a second oil outlet; 64-a spill valve core; 65-pressure regulating button; 71-a handle seat; 72-oil pump lever; 73-a hinged seat; 74-a spring; 75-a hinge block; 8-a first tubing; 9-a second tubing; 10-a third oil pipe; 20-an oil inlet pipe; 30-an oil outlet pipe; 40-one-way valve.
Detailed Description
The invention will be described in further detail with reference to the following figures and specific examples, without limiting the scope of the invention.
As shown in fig. 1 to 9, the portable hydraulic wrench with adjustable torque according to the present embodiment includes an oil tank 1, a power cylinder 2, a plunger power pump 3, a torque conversion mechanism, a reversing valve 5, an overflow valve 6 and a manual driving component, where the power cylinder 2, the plunger power pump 3, the reversing valve 5 and the overflow valve 6 are all disposed in the oil tank 1, a piston rod of the power cylinder 2 passes through a lower end of the oil tank 1 and is connected to the torque conversion mechanism in a transmission manner, a piston rod of the plunger power pump 3 passes through an upper end of the oil tank 1 and is connected to the manual driving component, the reversing valve 5 is provided with a first port 51, a second port 52, a third port 53, a fourth port 54 and a fifth port 55, the first port 51, the second port 52 and the third port 53 of the reversing valve 5 are respectively connected to a first oil pipe 8, a second oil pipe 9 and a third oil pipe 10, and the fourth port 54 is communicated with the oil tank 1, the other ends of the first oil pipe 8 and the second oil pipe 9 are connected with each other and then connected with a rodless cavity of the power oil cylinder 2, a valve core of the reversing valve 5 is used for switching the working states of a first port 51 and a second port 52, a rod cavity of the power oil cylinder 2 is connected with the other end of the first oil pipe 8, the rodless cavity of the plunger power pump 3 is connected with an oil inlet pipe 20 and an oil outlet pipe 30, the oil inlet pipe 20 and the oil outlet pipe 30 are both provided with one-way valves 40, the directions of the two one-way valves 40 are opposite, the other end of the oil inlet pipe 20 is communicated with the inside of the oil tank 1, the overflow valve 6 is provided with an oil inlet 61, a first oil outlet 62 and a second oil outlet 63, the other end of the oil outlet pipe 30 is connected with an oil inlet 61 of the overflow valve 6, a fifth port 55 of the reversing valve 5 is connected with the first oil outlet 62 of the overflow valve 6, and, an overflow valve core 64 is arranged between an oil inlet 61 and a second oil outlet 63 of the overflow valve 6, the second oil outlet 63 of the overflow valve 6 is communicated with the inside of the oil tank 1, the manual driving part is fixed at the upper end of the oil tank 1 and used for driving a piston rod of the plunger power pump 3 to do reciprocating motion, and the torque conversion mechanism is fixed at the lower end of the oil tank 1 and used for converting linear thrust of the piston rod of the power oil cylinder 2 into rotary torque.
When the hydraulic oil pump is used, the piston rod of the plunger power pump 3 is driven to extend through the manual driving part, the pressure in the rodless cavity of the plunger power pump 3 is reduced, hydraulic oil in the oil tank 1 pushes the check valve 40 open through the oil inlet pipe 20 and then enters the rodless cavity of the plunger power pump 3, then the piston rod of the plunger power pump 3 is driven to retract through the manual driving part, the pressure in the rodless cavity of the plunger power pump 3 is increased, the hydraulic oil in the rodless cavity of the plunger power arm forms high-pressure oil, the high-pressure oil enters the oil outlet pipe 30 and pushes the check valve 40 open, the high-pressure oil enters the overflow valve 6 through the oil outlet pipe 30, the oil inlet 61 and the first oil outlet 62 of the overflow valve 6 are communicated, the first oil outlet 62 and the fifth port 55 of the reversing valve 5 are communicated, therefore, the high-pressure oil enters the reversing valve 5 through the first oil outlet 62 and the fifth port 55, and simultaneously the reversing, the first port 51 is in a closed state and the second port 52 is in an open state through the valve core of the reversing valve 5, at the moment, high-pressure oil enters the rodless cavity and the rod cavity of the power cylinder 2 through the second oil pipe 9 and the third oil pipe 10 respectively, and the hiccup effective area of the high-pressure oil acting on the rod cavity is smaller than that of the rodless cavity, so that the high-pressure oil can push the piston rod of the power cylinder 2 to extend, the high-pressure oil in the rod cavity of the power cylinder 2 is extruded and discharged through the third oil pipe 10, then enters the second oil pipe 9 through the reversing valve 5 and then enters the rodless cavity of the power cylinder 2, the high-pressure oil flow of the rodless cavity of the power cylinder 2 is increased, the extending speed of the piston rod of the power cylinder 2 is also higher, and therefore, the extending speed of the piston rod of the power cylinder 2 is increased on the premise of not increasing the volume of the rodless cavity of the plunger power pump 3, and the working efficiency, when the piston rod of the power cylinder 2 extends out, the linear thrust or the linear tension of the piston rod of the power cylinder 2 is converted into the rotation torque through the torque conversion mechanism, so that the railway bolt or the pipeline connecting flange can be fastened;
when the railway bolt or the pipeline connecting flange needs to be disassembled, the valve core of the reversing valve 5 is adjusted to enable the first port 51 to be in an open state and the second port 52 to be in a closed state, then the piston rod of the plunger power pump 3 is driven to extend and retract in a reciprocating mode through the manual driving part, at the moment, high-pressure oil enters the overflow valve 6 through the oil outlet pipe 30, enters the third oil pipe 10 and then enters the rod cavity of the power oil cylinder 2, the oil quantity in the rod cavity of the power oil cylinder 2 is increased continuously, so that the piston rod of the power oil cylinder 2 is pushed to retract, meanwhile, hydraulic oil in the rod-free cavity of the power oil cylinder 2 enters the reversing valve 5 through the first oil pipe 8 and then flows back to the oil tank 1 through the fourth port 54 of the reversing valve 5, at the moment, when the piston rod of the power oil cylinder 2 retracts, the moment conversion mechanism converts the linear tension of the power oil, the disassembly of the railway bolt or the pipeline connecting flange is realized;
when the pressure of the high-pressure oil in the oil outlet pipe 30 is too large, the high-pressure oil can prop open the overflow valve core 64, so that the oil inlet 61 of the overflow valve 6 is communicated with the second oil outlet 63, and part of the high-pressure oil flows back into the oil tank 1, so that the pressure of the hydraulic oil can be effectively prevented from being too large, and the structure is more reasonable.
So set up, can let maintainer act on plunger power pump 3 through manual drive part, make plunger power pump 3 for power cylinder 2 pump sending hydraulic oil, then power cylinder 2 realizes stretching out and withdraws the switching of action under the effect of switching-over valve 5, convert power cylinder 2's straight line thrust or straight line pulling force into the rotation torque through the moment conversion mechanism simultaneously, and then can export bigger moment of torsion, thereby realize fastening and dismantling of railway bolt or pipeline flange, greatly reduced maintainer's intensity of labour, improve work efficiency, and small, light in weight, and convenient to carry, manual operation, not restricted by external condition.
Based on the above embodiment, as shown in fig. 1 to 7, the torque conversion mechanism includes a holding tube base 41, a rotation connection assembly 42, a spiral conversion head 43 and a torque head 44, wherein one end of the holding tube base 41 is fixed at the lower end of the oil tank 1 corresponding to the power cylinder 2, the rotation connection assembly 42 and the spiral conversion head 43 are both disposed in the holding tube base 41, one end of the rotation connection assembly 42 is hinged to the piston rod of the power cylinder 2, the other end of the rotation connection assembly 42 is hinged to the spiral conversion head 43, the other end of the spiral conversion head 43 extends out from the other end of the holding tube base 41, the torque head 44 is fixed at the other end of the spiral conversion head 43, the spiral conversion head 43 is provided with three parallel threaded grooves 431, a steel ball 45 is movably embedded in each threaded groove 431, the steel ball 45 is located at the other end of the conversion head 43, the steel ball 45 is also movably embedded in the holding tube seat 41; according to the arrangement, when the piston rod of the power cylinder 2 extends or retracts, the piston rod of the power cylinder 2 drives the spiral conversion head 43 to extend or retract through the rotating connection assembly 42, due to the limiting effect of the three steel balls 45 and the fact that the three steel balls 45 are respectively matched with the respective thread grooves 431, the spiral conversion head 43 rotates spirally and extends or retracts from the holding tube seat 41, the rotating connection assembly 42 ensures the possibility that the spiral conversion head 43 can rotate spirally, and therefore linear thrust or linear tension of the power cylinder 2 is converted into rotating torque, the spiral conversion head 43 drives the torque head 44 to rotate, the torque head 44 is sleeved on a railway bolt or a pipeline connecting flange, and fastening and dismounting of the railway bolt or the pipeline connecting flange can be achieved. In this embodiment, the torque head 44 is detachably mounted on the screw adapter 43, so that the torque head 44 can be replaced to adapt to various specifications of railway bolts or pipe connection flanges.
Based on the above embodiment, as shown in fig. 3 to 7, the rotation connection assembly 42 includes a bearing seat 421, a conversion bearing 422 and a connection shaft 423, the conversion bearing 422 is disposed in the bearing seat 421, one end of the connection shaft 423 is matched with an inner ring of the conversion bearing 422, the bearing seat 421 is hinged to a piston rod of the power cylinder 2, and the other end of the connection shaft 423 is hinged to the spiral conversion head 43; the arrangement is that the spiral conversion head 43 can extend and retract spirally under the matching of the three steel balls 45 and the thread groove 431.
Based on the above embodiment, as shown in fig. 1 and fig. 2, the manual driving component includes a handle seat 71, an oil pump lever 72, a hinge seat 73, and a spring 74, the handle seat 71 is fixed on the oil tank 1, the handle seat 71 is provided with a movable hole for the oil pump lever 72 to swing, the hinge seat 73 is located between the handle seat 71 and the piston rod of the plunger power pump 3 and fixed on the oil tank 1, one end of the oil pump lever 72 is hinged to the piston rod of the plunger power pump 3 after passing through the movable hole, the oil pump lever 72 is further hinged to the hinge seat 73 through a hinge block 75, and two ends of the spring 74 are respectively connected to the other end of the oil pump lever 72 and the handle seat 71; when the oil pump is used, the piston rod of the plunger power pump 3 is enabled to realize reciprocating motion by continuously pressing and pulling the oil pump lever 72, so that hydraulic oil in the oil tank 1 is pumped into the power oil cylinder 2, and when the piston rod of the plunger power pump 3 is retracted, the oil pump lever 72 can be pulled upwards by a maintainer by the aid of the spring 74, so that labor is saved, and labor intensity is further reduced.
Based on the above embodiment, further, as shown in fig. 9, the relief valve 6 is further provided with a pressure adjusting knob 65, and the pressure adjusting knob 65 is used for adjusting the withstand pressure of the relief valve core 64; the pressure adjusting button 65 can adjust the withstand pressure of the overflow valve core 64, so that the output torque value can be adjusted to adapt to the screwing of bolts and pipeline connecting flanges in different scenes.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present patent application are included in the protection scope of the present patent application.
Claims (6)
1. The utility model provides an adjustable hydraulic wrench of portable moment of torsion, its characterized in that, including oil tank (1), power cylinder (2), plunger power pump (3), moment conversion mechanism, switching-over valve (5), overflow valve (6) and manual drive part, power cylinder (2), plunger power pump (3), switching-over valve (5) and overflow valve (6) are all located in oil tank (1), the piston rod of power cylinder (2) is passed and is connected with the transmission of moment conversion mechanism behind the lower extreme of oil tank (1), the piston rod of plunger power pump (3) is passed and is connected with manual drive part behind the upper end of oil tank (1), switching-over valve (5) are equipped with first port (51), second port (52), third port (53), fourth port (54) and fifth port (55), first port (51) of switching-over valve (5) are had, The second port (52) and the third port (53) are respectively and correspondingly connected with a first oil pipe (8), a second oil pipe (9) and a third oil pipe (10), the fourth port (54) is communicated with the inside of the oil tank (1), the other ends of the first oil pipe (8) and the second oil pipe (9) are connected with a rodless cavity of the power oil cylinder (2) after being connected with each other, a valve core of the reversing valve (5) is used for switching the working states of the first port (51) and the second port (52), a rod cavity of the power oil cylinder (2) is connected with the other end of the first oil pipe (8), the rodless cavity of the plunger power pump (3) is connected with an oil inlet pipe (20) and an oil outlet pipe (30), one-way valves (40) are arranged in the oil inlet pipe (20) and the oil outlet pipe (30), the directions of the two one-way valves (40) are opposite, and the other end of the oil inlet pipe (20) is communicated with the inside of the oil tank (1, the overflow valve (6) is provided with an oil inlet (61), a first oil outlet (62) and a second oil outlet (63), the other end of the oil outlet pipe (30) is connected with an oil inlet (61) of the overflow valve (6), a fifth port (55) of the reversing valve (5) is connected with a first oil outlet (62) of the overflow valve (6), an oil inlet (61) of the overflow valve (6) is communicated with a first oil outlet (62), an overflow valve core (64) is arranged between the oil inlet (61) and the second oil outlet (63) of the overflow valve (6), a second oil outlet (63) of the overflow valve (6) is communicated with the inside of the oil tank (1), the manual driving part is fixed at the upper end of the oil tank (1), and is used for driving a piston rod of the plunger power pump (3) to do reciprocating motion, the torque conversion mechanism is fixed at the lower end of the oil tank (1), and the linear pushing force or the linear pulling force of the piston rod of the power cylinder (2) is converted into the rotation moment.
2. The portable hydraulic wrench with adjustable torque as claimed in claim 1, wherein the torque conversion mechanism comprises a holding tube seat (41), a rotation connection assembly (42), a screw conversion head (43) and a torque head (44), one end of the holding tube seat (41) is fixed at the lower end of the oil tank (1) corresponding to the power cylinder (2), the rotation connection assembly (42) and the screw conversion head (43) are both arranged in the holding tube seat (41), one end of the rotation connection assembly (42) is hinged with a piston rod of the power cylinder (2), the other end of the rotation connection assembly (42) is hinged with the screw conversion head (43), the other end of the screw conversion head (43) extends out from the other end of the holding tube seat (41), the torque head (44) is fixed at the other end of the screw conversion head (43), three parallel thread grooves (431) are arranged on the screw conversion head (43), each thread groove (431) is movably embedded with a steel ball (45), the steel ball (45) is positioned at the other end of the spiral conversion head (43), and the steel ball (45) is also movably embedded in the holding tube seat (41).
3. The portable hydraulic wrench with the adjustable torque as claimed in claim 2, wherein the rotation connection assembly (42) comprises a bearing seat (421), a conversion bearing (422) and a connection shaft (423), the conversion bearing (422) is arranged in the bearing seat (421), one end of the connection shaft (423) is matched with an inner ring of the conversion bearing (422), the bearing seat (421) is hinged to a piston rod of the power cylinder (2), and the other end of the connection shaft (423) is hinged to the screw conversion head (43).
4. The portable hydraulic wrench with the adjustable torque as claimed in claim 1, wherein the manual driving component comprises a handle seat (71), an oil pump lever (72), a hinged seat (73) and a spring (74), the handle seat (71) is fixed on the oil tank (1), the handle seat (71) is provided with a movable hole for the swing of the oil pump lever (72), the hinged seat (73) is located between the handle seat (71) and a piston rod of the plunger power pump (3) and fixed on the oil tank (1), one end of the oil pump lever (72) is hinged to the piston rod of the plunger power pump (3) after passing through the movable hole, the oil pump lever (72) is further hinged to the hinged seat (73) through a hinged block (75), and two ends of the spring (74) are respectively connected to the other end of the oil pump lever (72) and the handle seat (71).
5. The portable hydraulic wrench with adjustable torque according to claim 1, characterized in that the relief valve (6) is further provided with a pressure adjusting knob (65), the pressure adjusting knob (65) being used for adjusting the withstand pressure of the relief valve core (64).
6. The portable hydraulic wrench with adjustable torque according to claim 1, characterized in that the relief valve (6) is further provided with a pressure adjusting knob (65), the pressure adjusting knob (65) being used for adjusting the withstand pressure of the relief valve core (64).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910947526.3A CN110625558A (en) | 2019-10-08 | 2019-10-08 | Portable hydraulic wrench with adjustable torque |
| CN202011548971.1A CN112428204A (en) | 2019-10-08 | 2019-10-08 | Use method of portable torque-adjustable hydraulic wrench |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910947526.3A CN110625558A (en) | 2019-10-08 | 2019-10-08 | Portable hydraulic wrench with adjustable torque |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011548971.1A Division CN112428204A (en) | 2019-10-08 | 2019-10-08 | Use method of portable torque-adjustable hydraulic wrench |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110625558A true CN110625558A (en) | 2019-12-31 |
Family
ID=68975653
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011548971.1A Withdrawn CN112428204A (en) | 2019-10-08 | 2019-10-08 | Use method of portable torque-adjustable hydraulic wrench |
| CN201910947526.3A Pending CN110625558A (en) | 2019-10-08 | 2019-10-08 | Portable hydraulic wrench with adjustable torque |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011548971.1A Withdrawn CN112428204A (en) | 2019-10-08 | 2019-10-08 | Use method of portable torque-adjustable hydraulic wrench |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN112428204A (en) |
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| CN208841266U (en) * | 2018-08-01 | 2019-05-10 | 中铁二十局集团第二工程有限公司 | A kind of hand-hydraulic torque spanner |
| CN211193673U (en) * | 2019-10-08 | 2020-08-07 | 思辉流体科技(上海)有限公司 | Portable hydraulic wrench with adjustable torque |
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2019
- 2019-10-08 CN CN202011548971.1A patent/CN112428204A/en not_active Withdrawn
- 2019-10-08 CN CN201910947526.3A patent/CN110625558A/en active Pending
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| SU817201A1 (en) * | 1979-05-04 | 1981-03-30 | Научно-Исследовательский И Проект-Ho-Конструкторский Институт По Добы-Че Полезных Ископаемых Открытым Спо-Собом Министерства Угольной Промышлен-Ности Cccp | Device for engaging drill rods |
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| CN2350167Y (en) * | 1998-07-28 | 1999-11-24 | 江华葆 | Open hydraulic wrench |
| CN2500435Y (en) * | 2001-07-12 | 2002-07-17 | 韩忠 | Hydraulic tool |
| CN202241057U (en) * | 2011-10-19 | 2012-05-30 | 天津容大机电科技有限公司 | Automatic special-shaped bolt screwing device |
| CN105474795B (en) * | 2011-12-14 | 2014-09-10 | 上海宇航系统工程研究所 | A kind of pretightning force charger being applicable to aircraft band and connecting tripper |
| CN108161813A (en) * | 2017-11-16 | 2018-06-15 | 安徽蒂森五金工具有限公司 | A kind of hand-hydraulic screw spanner |
| CN207788761U (en) * | 2017-12-27 | 2018-08-31 | 西安汽车科技职业学院 | A kind of Portable manual hydraulic pressure spanner |
| CN208841266U (en) * | 2018-08-01 | 2019-05-10 | 中铁二十局集团第二工程有限公司 | A kind of hand-hydraulic torque spanner |
| CN211193673U (en) * | 2019-10-08 | 2020-08-07 | 思辉流体科技(上海)有限公司 | Portable hydraulic wrench with adjustable torque |
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