CN221051439U - Overload protection oil circuit of winch - Google Patents
Overload protection oil circuit of winch Download PDFInfo
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- CN221051439U CN221051439U CN202322878245.1U CN202322878245U CN221051439U CN 221051439 U CN221051439 U CN 221051439U CN 202322878245 U CN202322878245 U CN 202322878245U CN 221051439 U CN221051439 U CN 221051439U
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- 239000003921 oil Substances 0.000 abstract description 133
- 239000010720 hydraulic oil Substances 0.000 abstract description 31
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The utility model provides a winch overload protection oil way, which comprises an oil tank, a multi-way valve group and a winch system, wherein the oil tank is connected with an oil inlet pipeline and an oil return pipeline, an oil pump is arranged in the oil inlet pipeline, the input end of the oil pump is connected with the oil tank, the output end of the oil pump is connected with the multi-way valve group, the multi-way valve group is also connected with the winch system and the oil return pipeline, a pressure switch and a throttle valve are connected between the output end of the oil pump and the multi-way valve group, the throttle valve is used for increasing the oil pressure in the oil way between the oil pump and the multi-way valve group, and the pressure switch is used for detecting the pressure value of the oil way between the oil pump and the multi-way valve group; the throttle valve reduces the flow of the hydraulic oil input to the multi-way valve group, increases the oil pressure of the oil inlet pipeline in the areas of the oil pump and the multi-way valve group, and increases the oil pressure value of the hydraulic oil passing through the pressure switch at present; the difference between the oil pressure value when the winch system is fully loaded and the oil pressure value when the overload is 1.1 times is increased, and the pressure switch can accurately detect whether the winch system is overloaded or not.
Description
Technical Field
The utility model relates to the technical field of crane winches, in particular to a winch overload protection oil way.
Background
The marine crane is one of main equipment on an offshore platform and is mainly used for lifting equipment and receiving workers, and due to complex marine climate and environment, the crane has a severe working environment and is required to have high safety performance, the crane is provided with multiple safety protection functions, and the crane cannot be severely overloaded during working under normal conditions. When the crane is overloaded, pressure relief is required.
As in the chinese application No. 202122954349.7, the patent document with publication date 2022.6.7 discloses an overload protection hydraulic system of a winch, which comprises an oil tank, an output valve group, an overload valve group and a regulating valve group, wherein the regulating valve group comprises a hydraulic control reversing valve and a regulating shuttle valve, the P end of the hydraulic control reversing valve is connected with a multi-way valve through a three-way valve, and the control port of the hydraulic control reversing valve is connected with one end of the regulating shuttle valve; the end A of the hydraulic control reversing valve is connected with the output valve group, the end T of the hydraulic control reversing valve is connected with the oil tank, and the end B of the hydraulic control reversing valve is normally closed; the overload valve group comprises an overload sequence valve, one end of the overload sequence valve is connected with the output valve group, and the other end of the overload sequence valve is connected with a third end of the adjusting shuttle valve.
The hydraulic system detects pressure through the sequence valve, but for a small-tonnage crane, the difference between the full-load pressure value and the overload pressure value is small compared with the overload pressure value which is 1.1 times, and whether the crane is overloaded can not be accurately identified through the sequence valve.
Disclosure of Invention
The utility model provides a winch overload protection oil way, which is provided with a throttle valve, and the pressure numerical difference between full load and overload of a winch is enlarged by 1.1 times, and when the winch is overloaded, the winch stops operating.
In order to achieve the above purpose, the technical scheme of the utility model is as follows: the utility model provides a winch overload protection oil circuit, includes oil tank, multiple unit valve group and winch system, and the oil tank is connected with into oil pipe and returns oil pipe, is equipped with the oil pump in the oil pipe into oil pipe, and the input and the oil tank of oil pump are connected, and the output and the multiple unit valve group of oil pump are connected, and multiple unit valve group still is connected with winch system and returns oil pipe, is connected with pressure switch and choke valve between the output and the multiple unit valve of oil pump, and the choke valve is arranged in the oil pressure of amplifying in the oil circuit between oil pump and the multiple unit valve group, and pressure switch is arranged in detecting the pressure numerical value of the oil circuit between oil pump and the multiple unit valve group.
The multi-way valve group comprises a three-position seven-way flashlight control reversing valve, a two-position two-way electromagnetic ball valve I, a two-position two-way electromagnetic ball valve II, a shuttle valve I, a shuttle valve II and a pilot overflow valve; the two-position two-way electromagnetic ball valve I and the two-position two-way electromagnetic ball valve II are connected with a pressure switch signal.
The three-position seven-way flashlight control reversing valve comprises an A port, a B port, a C port, a D port, an E port, an F port and a G port, wherein the output end of an oil pump is connected with the B port and the input end of a pilot type overflow valve, the A port and the C port are both connected with an oil return pipeline, the D port is connected with the first input end of a shuttle valve I, the output end of the shuttle valve I is connected with the second input end of a shuttle valve II, and the output end of the shuttle valve II is connected with the control end of the pilot type overflow valve.
The first input end of the shuttle valve I is also connected with the input end of the two-position two-way electromagnetic ball valve I, and the output end of the two-position two-way electromagnetic ball valve I and the output end of the pilot overflow valve are both connected with an oil return pipeline; the E port is connected with one end of the winch system; the port F is connected with the other end of the winch system; the G port is connected with a second input end of the first shuttle valve, and the second input end of the first shuttle valve is also connected with an input end of the second two-position two-way electromagnetic ball valve; the output end of the two-position two-way electromagnetic ball valve II is connected with an oil return pipeline.
The hydraulic oil flowing out of the D port of the three-position seven-way flashlight control reversing valve flows to the control end of the pilot type overflow valve through the first shuttle valve and the second shuttle valve, and is blocked between the input end and the output end of the pilot type overflow valve; when the load of the winch system is overloaded, the pressure switch sends a signal to the two-position two-way electromagnetic ball valve I, the two-position two-way electromagnetic ball valve I is conducted in a reversing way, hydraulic oil flowing out of the D port of the three-position seven-way manual control reversing valve flows to the two-position two-way electromagnetic ball valve I and then enters a return pipeline, hydraulic oil flowing out of the D port does not pass through the shuttle valve I, so that the control end of the pilot overflow valve has no oil pressure, the pilot overflow valve is opened, the input end and the output end of the pilot overflow valve are conducted, hydraulic oil output from the oil pump enters an oil return pipeline through the pilot overflow valve, and the multi-way valve group is decompressed, so that the winch system cannot be lifted when in overload, lifting action can not be performed when overload occurs, and the problem that potential safety hazards can occur when the overload lifting is avoided; the safety problem of the winch system during working is guaranteed.
Setting a throttle valve to reduce the flow of hydraulic oil input to the multi-way valve group, and increasing the oil pressure of an oil inlet pipeline in the areas of the oil pump and the multi-way valve group, so that the oil pressure value of the hydraulic oil passing through a pressure switch at present is increased; the difference between the oil pressure value when the winch system is fully loaded and the oil pressure value when the winch system is overloaded by 1.1 times is increased, so that the pressure switch can accurately detect whether the winch system is overloaded or not.
Further, a hydraulic control one-way valve is arranged between the output end of the oil pump and the three-position seven-way flashlight control reversing valve, the input end of the hydraulic control one-way valve is connected with the output end of the oil pump, the output end of the hydraulic control one-way valve is connected with the port B of the three-position seven-way flashlight control reversing valve, and the control end of the hydraulic control one-way valve is connected with the right input end of the shuttle valve II.
The hydraulic control one-way valve is arranged above the oil way, so that the three-position seven-way flashlight control reversing valve can be protected, high-pressure hydraulic oil is prevented from directly impacting the three-position seven-way flashlight control reversing valve, and the pressure between the output end of the oil pump and the oil inlet end of the three-position seven-way flashlight control reversing valve can be balanced.
Further, a first relief valve is disposed between the first input end of the first shuttle valve and the return line, and between the second input end and the return line.
The oil passage is provided with a first overflow valve for controlling the pressure of the hydraulic oil flowing through the shuttle valve I.
Furthermore, a pressure gauge is arranged at the input end of the pilot overflow valve through a quick-change joint with a one-way valve.
Above oil circuit sets up the manometer through the quick change connector that takes the check valve, and this kind of setting can guarantee to block up the oil circuit with the check valve before changing the dismantlement manometer, prevents to reveal, realizes quick replacement, and the manometer can the oil pressure in the visual display oil circuit.
Further, the winch system comprises a lifting motor and a lifting balance valve, and the lifting balance valve comprises a lifting one-way valve and a lifting overflow valve; the output end of the lifting overflow valve is connected with the F port, the input end of the lifting overflow valve is connected with one end of the lifting motor, the other end of the lifting motor and the control end of the lifting overflow valve are connected with the E port, the input end of the lifting one-way valve is connected with the output end of the lifting overflow valve, and the output end of the lifting one-way valve is connected with the input end of the lifting overflow valve.
When the three-position seven-way flashlight control reversing valve reverses to the left position, hydraulic oil flows from the port B to the port E, then flows to the control end of the lifting overflow valve, flows to the lifting motor after being conducted, then flows into the three-position seven-way flashlight control reversing valve through the lifting overflow valve, flows from the port F to the port C, then flows into the oil return pipeline and then enters the oil tank, so that the lifting motor drives the winch to move along one direction.
When the three-position seven-way flashlight control reversing valve reverses to the right position, hydraulic oil flows from the port B to the port F, flows through the lifting one-way valve and then flows into one end of the lifting motor, then flows into the three-position seven-way flashlight control reversing valve from the other end of the lifting motor, flows from the port E to the port A, flows into the oil return pipeline and then enters the oil tank, so that the lifting motor drives the winch to move along the other direction.
The lifting motor drives the winch to move in different directions, so that the winch can be lifted and lowered.
Further, the winch system further comprises a normally closed brake and a lifting shuttle valve, a first input end of the lifting shuttle valve is connected with the F port, a second input end of the lifting shuttle valve is connected with the E port, an output end of the lifting shuttle valve is connected with an oil cylinder of the normally closed brake, and the normally closed brake acts on an output shaft of the lifting motor.
The lifting motor is braked through the normally closed brake, when the lifting motor is required to be driven to act, part of hydraulic oil output from an F port or an E port of the three-position seven-way flashlight control reversing valve flows into the lifting shuttle valve, and then the lifting shuttle valve flows into the normally closed brake, so that the normally closed brake releases the brake on an output shaft of the lifting motor, and the reliability is good; when the three-position seven-way flashlight control reversing valve is reset to the middle position, the hydraulic oil stops inputting; hydraulic oil flows back to the three-position seven-way flashlight control reversing valve from the oil cylinder of the normally closed brake.
Drawings
Fig. 1 is a schematic diagram of a hydraulic oil passage according to the present utility model.
FIG. 2 is an enlarged view of the portion W of FIG. 1;
FIG. 3 is a schematic diagram of the interfaces of the three-position seven-way flashlight control reversing valve of the utility model;
FIG. 4 is a hydraulic schematic of the winch system of the present utility model
Detailed Description
The utility model is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1-4, a winch overload protection oil circuit comprises an oil tank 1, a multi-way valve group 2, a winch system 3, a pressure switch 4 and a throttle valve 5; the oil tank 1 is connected with an oil inlet pipeline 11 and an oil return pipeline 12, an oil pump 13 is arranged in the oil inlet pipeline 11, the input end of the oil pump 13 is connected with the oil tank 1, the output end of the oil pump 13 is connected with the multi-way valve group 2, the multi-way valve group 2 is also connected with the winch system 3 and the oil return pipeline 12, the pressure switch 4 and the throttle valve 5 are connected between the output end of the oil pump 13 and the multi-way valve group 2, the throttle valve 5 is used for amplifying the oil pressure in an oil way between the oil pump 13 and the multi-way valve group 2, and the pressure switch 4 is used for detecting the pressure value of the oil way between the oil pump 13 and the multi-way valve group 2.
The multi-way valve group 2 comprises a three-position seven-way flashlight control reversing valve 21, a two-position two-way electromagnetic ball valve I22, a two-position two-way electromagnetic ball valve II 23, a shuttle valve I24, a shuttle valve II 25 and a pilot overflow valve 26; the two-position two-way electromagnetic ball valve I22 and the two-position two-way electromagnetic ball valve II 23 are connected with the pressure switch 4 in a signal way.
The three-position seven-way flashlight control reversing valve 21 comprises an A port, a B port, a C port, a D port, an E port, an F port and a G port, the output end of the oil pump 13 is connected with the B port and the input end of the pilot type overflow valve 26, the A port and the C port are connected with the oil return pipeline 12, the D port is connected with the first input end of the shuttle valve I24, the output end of the shuttle valve I24 is connected with the second input end of the shuttle valve II 25, and the output end of the shuttle valve II 25 is connected with the control end of the pilot type overflow valve 26.
The first input end of the shuttle valve I24 is also connected with the input end of the two-position two-way electromagnetic ball valve I22, and the output end of the two-position two-way electromagnetic ball valve I22 and the output end of the pilot overflow valve 26 are both connected with the oil return pipeline 12; the E port is connected with one end of the winch system 3; the port F is connected with the other end of the winch system 3; the G port is connected with a second input end of the first shuttle valve 24, and the second input end of the first shuttle valve 24 is also connected with an input end of the second two-position two-way electromagnetic ball valve 23; the output end of the two-position two-way electromagnetic ball valve II 23 is connected with the oil return pipeline 12.
Setting a throttle valve 5 to reduce the flow of hydraulic oil input to the multi-way valve group 2, and increasing the oil pressure of the oil inlet pipeline 11 in the areas of the oil pump 13 and the multi-way valve group 2 so that the oil pressure value of the hydraulic oil passing through the pressure switch 4 at present is increased; the difference between the oil pressure value when the winch system 3 is fully loaded and the oil pressure value when the overload is 1.1 times is increased, so that the pressure switch 4 can accurately detect whether the winch system 3 is overloaded.
In this embodiment, a pilot operated check valve 27 is disposed between the output end of the oil pump 13 and the three-position seven-way flashlight control reversing valve 21, the input end of the pilot operated check valve 27 is connected to the output end of the oil pump 13, the output end of the pilot operated check valve 27 is connected to the port B of the three-position seven-way flashlight control reversing valve 21, and the control end of the pilot operated check valve 27 is connected to the right input end of the shuttle valve two 25. The hydraulic control check valve 27 is arranged, so that the three-position seven-way flashlight control reversing valve 21 can be protected, high-pressure hydraulic oil is prevented from directly impacting the three-position seven-way flashlight control reversing valve 21, and the pressure between the output end of the oil pump 13 and the oil inlet end of the three-position seven-way flashlight control reversing valve 21 can be balanced.
A first relief valve 28 is provided between the first input of the first shuttle valve 24 and the return line 12, and between the second input and the return line 12. A first relief valve 28 is provided to control the pressure of the hydraulic oil flowing through the shuttle valve one 24.
The pressure gauge 19 is provided at the input end of the pilot relief valve 26 via a quick change joint 291 with a check valve. The pressure gauge 29 is arranged through the quick-change connector 291 with the check valve, the arrangement can ensure that the oil way is blocked by the check valve before the pressure gauge is replaced and disassembled, leakage is prevented, quick replacement is realized, and the pressure gauge 29 can visually display the oil pressure in the oil way.
The winch system 3 comprises a lifting motor 31 and a lifting balance valve 32, and the lifting balance valve 32 comprises a lifting one-way valve 321 and a lifting overflow valve 322; the output end of the lifting overflow valve 322 is connected with the F port, the input end of the lifting overflow valve 322 is connected with one end of the lifting motor 31, the other end of the lifting motor 31 and the control end of the lifting overflow valve 322 are connected with the E port, the input end of the lifting one-way valve 321 is connected with the output end of the lifting overflow valve 322, and the output end of the lifting one-way valve 321 is connected with the input end of the lifting overflow valve 322. The lifting motor 31 drives the winch to move in different directions, so that the winch can be lifted and lowered.
When the three-position seven-way flashlight control reversing valve 21 reverses to the left, hydraulic oil flows from the port B to the port E, then flows to the control end of the lifting overflow valve 322, flows to the lifting motor 31 after the lifting overflow valve 322 is conducted, then flows into the three-position seven-way flashlight control reversing valve 21 through the lifting overflow valve 322, flows from the port F to the port C, then flows into the oil return pipeline 12 and then enters the oil tank 1, so that the lifting motor 31 drives the winch to move along one direction.
When the three-position seven-way flashlight control reversing valve 21 reverses to the right, hydraulic oil flows from the port B to the port F, flows through the lifting one-way valve 321 and then flows into one end of the lifting motor 31, then flows into the three-position seven-way flashlight control reversing valve 21 from the other end of the lifting motor 31, flows from the port E to the port A, flows into the oil return pipeline 12 and then enters the oil tank 1, so that the lifting motor 31 drives the winch to move along the other direction.
The winch system 3 further comprises a normally closed brake 33 and a lifting shuttle valve 34, wherein a first input end of the lifting shuttle valve 34 is connected with the F port, a second input end of the lifting shuttle valve 34 is connected with the E port, an output end of the lifting shuttle valve 34 is connected with an oil cylinder of the normally closed brake 33, and the normally closed brake 33 acts on an output shaft of the lifting motor 31. When the lifting motor 31 needs to be driven to act, part of hydraulic oil output from an F port or an E port of the three-position seven-way flashlight control reversing valve 21 flows into the lifting shuttle valve 34, and then the lifting shuttle valve 34 flows into the normally closed type brake 33, so that the normally closed type brake 33 releases braking on an output shaft of the lifting motor 31, and the reliability is good; when the three-position seven-way flashlight control reversing valve 21 is reset to the middle position, the hydraulic oil stops being input; hydraulic oil flows back from the cylinder of the normally closed brake 33 to the three-position seven-way manual control reversing valve 21.
When the oil circuit works, the reversing valve 21 is controlled by a three-position seven-way flashlight to reverse and drive the winch system 3 to act, when the load of the winch system 3 is normal, the oil circuit of the two-position two-way electromagnetic ball valve I22 is closed, hydraulic oil flowing out of the opening of the three-position seven-way flashlight controlled reversing valve 21D flows to the control end of the pilot overflow valve 26 through the shuttle valve I24 and the shuttle valve II 25, and the space between the input end and the output end of the pilot overflow valve 26 is cut off; when the load of the winch system 3 is overloaded, the pressure switch 4 sends a signal to the two-position two-way electromagnetic ball valve I22, the two-position two-way electromagnetic ball valve I22 is conducted in a reversing way, hydraulic oil flowing out of the opening of the three-position seven-way manual control reversing valve 21D flows to the two-position two-way electromagnetic ball valve I22 and then enters a return pipeline, hydraulic oil flowing out of the opening D does not pass through the shuttle valve I24, so that the control end of the pilot overflow valve 26 is free from oil pressure, the pilot overflow valve 26 is opened, the input end and the output end of the pilot overflow valve 26 are conducted, hydraulic oil output from the oil pump 13 enters the return pipeline 12 through the pilot overflow valve 26 to decompress the multi-way valve group 2, so that the winch system 3 cannot be lifted when overloaded, and lifting action cannot be performed when overloaded, and the problem of potential safety hazards when overloaded is avoided; the safety problem of the winch system 3 during operation is ensured.
In the present embodiment, when the throttle valve is fully opened, if the full load oil pressure value is 4 mpa, the overload oil pressure value of the oil pump 13 and the area of the multiple-way valve group 2 is 4.4 mpa or more, and if it is necessary to detect that the oil pressure value is 4.4 mpa or more, the overload of the winch system is determined; however, when the winch system is overloaded by 1.1 times, the overload oil pressure value is 4.4 megapascals, and the overload oil pressure value is 4.4 megapascals and the full oil pressure value is 4 megapascals, so that whether the winch system is overloaded or not cannot be accurately detected. Reducing the flow of hydraulic oil and amplifying the oil pressure of the hydraulic oil by reducing the opening of a throttle valve; if the full load oil pressure value is 10 megapascals, the overload oil pressure value of the oil pump 13 and the area of the multi-way valve group 2 is more than 11 megapascals, and if the detected oil pressure value is more than 11 megapascals, the overload of the winch system is judged; when the winch system is overloaded by 1.1 times, the overload oil pressure value is 11 megapascals, the difference value between the overload oil pressure value of 11 megapascals and the full oil pressure value of 10 megapascals is large, and whether the winch system is overloaded or not is accurately detected.
Claims (6)
1. The utility model provides a winch overload protection oil circuit, includes oil tank, multiple unit valves and winch system, and the oil tank is connected with into oil pipe and returns oil pipe, is equipped with the oil pump in into oil pipe, and the input and the oil tank of oil pump are connected, and the output and the multiple unit valves of oil pump are connected, and multiple unit valves still are connected its characterized in that with winch system and returns oil pipe: a pressure switch and a throttle valve are connected between the output end of the oil pump and the multi-way valve group, the throttle valve is used for amplifying the oil pressure in an oil way between the oil pump and the multi-way valve group, and the pressure switch is used for detecting the pressure value of the oil way between the oil pump and the multi-way valve group;
The multi-way valve group comprises a three-position seven-way flashlight control reversing valve, a two-position two-way electromagnetic ball valve I, a two-position two-way electromagnetic ball valve II, a shuttle valve I, a shuttle valve II and a pilot overflow valve; the two-position two-way electromagnetic ball valve I and the two-position two-way electromagnetic ball valve II are connected with a pressure switch signal;
The three-position seven-way flashlight control reversing valve comprises an A port, a B port, a C port, a D port, an E port, an F port and a G port, wherein the output end of an oil pump is connected with the B port and the input end of a pilot type overflow valve;
The first input end of the shuttle valve I is also connected with the input end of the two-position two-way electromagnetic ball valve I, and the output end of the two-position two-way electromagnetic ball valve I and the output end of the pilot overflow valve are both connected with an oil return pipeline; the E port is connected with one end of the winch system; the port F is connected with the other end of the winch system; the G port is connected with a second input end of the first shuttle valve, and the second input end of the first shuttle valve is also connected with an input end of the second two-position two-way electromagnetic ball valve; the output end of the two-position two-way electromagnetic ball valve II is connected with an oil return pipeline.
2. The winch overload protection oil circuit according to claim 1, wherein: a hydraulic control one-way valve is arranged between the output end of the oil pump and the three-position seven-way flashlight control reversing valve, the input end of the hydraulic control one-way valve is connected with the output end of the oil pump, the output end of the hydraulic control one-way valve is connected with the B port of the three-position seven-way flashlight control reversing valve, and the control end of the hydraulic control one-way valve is connected with the right input end of the shuttle valve II.
3. The winch overload protection oil circuit according to claim 1, wherein: a first overflow valve is arranged between the first input end of the first shuttle valve and the oil return pipeline and between the second input end of the first shuttle valve and the oil return pipeline.
4. The winch overload protection oil circuit according to claim 1, wherein: the input end of the pilot overflow valve is provided with a pressure gauge through a quick-change connector with a one-way valve.
5. The winch overload protection oil circuit according to claim 1, wherein: the winch system comprises a lifting motor and a lifting balance valve, and the lifting balance valve comprises a lifting one-way valve and a lifting overflow valve; the output end of the lifting overflow valve is connected with the F port, the input end of the lifting overflow valve is connected with one end of the lifting motor, the other end of the lifting motor and the control end of the lifting overflow valve are connected with the E port, the input end of the lifting one-way valve is connected with the output end of the lifting overflow valve, and the output end of the lifting one-way valve is connected with the input end of the lifting overflow valve.
6. The winch overload protection oil circuit according to claim 5, wherein: the winch system further comprises a normally closed brake and a lifting shuttle valve, a first input end of the lifting shuttle valve is connected with the F port, a second input end of the lifting shuttle valve is connected with the E port, an output end of the lifting shuttle valve is connected with an oil cylinder of the normally closed brake, and the normally closed brake acts on an output shaft of the lifting motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322878245.1U CN221051439U (en) | 2023-10-26 | 2023-10-26 | Overload protection oil circuit of winch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322878245.1U CN221051439U (en) | 2023-10-26 | 2023-10-26 | Overload protection oil circuit of winch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221051439U true CN221051439U (en) | 2024-05-31 |
Family
ID=91197680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322878245.1U Active CN221051439U (en) | 2023-10-26 | 2023-10-26 | Overload protection oil circuit of winch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221051439U (en) |
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2023
- 2023-10-26 CN CN202322878245.1U patent/CN221051439U/en active Active
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