CN115122269A - Round tube clamping and rotating device - Google Patents
Round tube clamping and rotating device Download PDFInfo
- Publication number
- CN115122269A CN115122269A CN202110316392.2A CN202110316392A CN115122269A CN 115122269 A CN115122269 A CN 115122269A CN 202110316392 A CN202110316392 A CN 202110316392A CN 115122269 A CN115122269 A CN 115122269A
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- movable body
- main body
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- hydraulic
- power transmission
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- 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
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
-
- 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
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Clamps And Clips (AREA)
Abstract
The invention relates to the field of hardware tools, in particular to a circular tube clamping and rotating device. The pipe fitting and the pipeline are screwed by using the pipe tongs in the pipeline installation, and when the pipe tongs are used, the pipe fitting is not easy to clamp, time and labor are wasted, and the labor intensity is high. In order to solve the defects, the invention provides a circular tube clamping and rotating device which comprises a main body, a movable body, a rolling wheel, a power transmission mechanism, a power motor or an external power connector, a hydraulic pump, a hydraulic cylinder and a hydraulic piston rod. The invention can quickly clamp the circular tube to continuously rotate, improves the efficiency and lightens the labor intensity.
Description
Technical Field
Belongs to the field of hardware tools, and particularly relates to a pipeline mounting tool.
Background
During the pipe fitting maintenance, screw and dismantle pipeline and pipe fitting, will use the breakout tongs, when using the breakout tongs, adjust the opening of breakout tongs, the chucking of breakout tongs on pipeline or pipe fitting, pull hard, make the breakout tongs rotatory certain angle, loosen the breakout tongs again, return the action of the repeated last of normal position, when using the breakout tongs, the pipe fitting is difficult to press from both sides tightly, comes and goes a repeated action, wastes time and energy, and intensity of labour is very big.
Disclosure of Invention
In order to solve the above disadvantages, the present invention provides a technical solution, which specifically comprises: a circular tube clamping and rotating device comprises a main body, a movable body, rolling wheels, a power transmission mechanism, a power motor (including but not limited to a motor, a pneumatic motor, a hydraulic motor, an internal combustion engine and other power machines) or an external power connector, a hydraulic pump, a hydraulic cylinder and a hydraulic piston rod;
preferably, the main body slides and is connected with or rotates around a fixed shaft and is connected with or slides while rotating around a fixed shaft and is connected with and forms an opening, the size of the opening is correspondingly changed along with the movable body, one or more rolling wheels are respectively arranged and rotatably connected at the openings of the main body and the movable body to form a rolling wheel combination with the total number of more than or equal to three, and the contact surface of the rolling wheels and the pipe fitting can be provided with regular or irregular lines;
preferably, the rolling wheels are in single transmission connection or a plurality of rolling wheels are in simultaneous transmission connection with a power transmission mechanism, when the power transmission mechanism is simultaneously connected with the main body and the rolling wheels of the movable body, the power transmission mechanism between the movable body and the main body is provided with but not limited to a flexible shaft, and the power transmission mechanism is in transmission connection with a power motor or an external power connector;
preferably, the main body or the movable body is provided with a hydraulic cylinder, the hydraulic piston rod is connected in the hydraulic cylinder in a sliding manner, the hydraulic pump is connected with the hydraulic cylinder through a pipeline, and the hydraulic pump is driven by a power motor or an external power connector (directly or indirectly) or driven by self-powered power.
Preferably, the power clutch device is used for cutting off or transmitting power, including cutting off or transmitting power of rolling wheels or power of a hydraulic pump, and can be directly operated or connected with a corresponding switch through a mechanical or circuit for operation.
Preferably, the power transmission mechanism is provided with a torque force adjusting mechanism or a speed reducing mechanism or both the torque force adjusting mechanism and the speed reducing mechanism.
Preferably, the hydraulic pressure adjusting mechanism is included, and a connecting pipeline of the hydraulic cylinder and the hydraulic pump is provided with the hydraulic pressure adjusting mechanism.
Preferably, the hydraulic pump comprises a clamping switch, and the connecting pipeline of the hydraulic cylinder and the hydraulic pump is provided with the clamping switch.
Preferably, a return device is arranged between the main body and the movable body.
Preferably, when the main body slides and is connected or slides and is connected while rotating and connecting around a fixed shaft, the movable body is provided with a manual adjusting wheel, the movable body and the manual adjusting wheel are provided with threads, and the manual adjusting wheel rotates on the threads of the movable body.
Preferably, when the main body slides and is connected or slides and is connected and simultaneously rotates and is connected around a fixed shaft, the sliding contact surfaces of the movable body and the main body are provided with linear slide ways which are matched with each other.
Preferably, the power motor, when an electric machine, comprises a battery, which can be fixed or removable.
Preferably, the power transmission mechanism comprises a tool connecting device when being in transmission connection with the external power connector, the tool connecting device is connected with the power tool and can be detached, and the external power connector is in transmission connection with a power part of the power tool and can be detached.
Preferably, a power switch is included for controlling the rotation and stop of the power motor.
Preferably, the power transmission mechanism transmits power by one or more combinations of the existing power transmission modes such as shaft transmission, gear transmission, chain transmission, worm transmission, friction disc transmission, belt transmission and the like.
The invention has the technical effects and advantages that: a circular tube clamping and rotating device is characterized in that a power motor or an existing power tool drives a hydraulic pump to provide liquid, and a clamping switch controls a hydraulic piston rod to slide, so that a rolling wheel can quickly clamp and separate a circular tube; a hydraulic clamping mechanism is adopted, so that the clamping force of the rolling wheel is large; the contact surface of the rolling wheel and the circular tube can be provided with lines to increase the driving force and prevent slipping; be equipped with hydraulic pressure adjustment mechanism, can conveniently adjust clamping pressure: the power motor or the external power connector drives the rolling wheel to rotate through the power transmission mechanism, so that the circular tube can continuously rotate; the power transmission mechanism of the movable body and the main body is provided with a flexible shaft, so that the main body and the rolling wheels of the movable body can rotate simultaneously, the torque force is increased, and the movable body is not hindered from doing clamping action; the power transmission mechanism is provided with a power clutch device which can control the rotation and stop of the rolling wheel; the torsion adjusting mechanism is adjusted to change the torsion of the rolling wheel; the manual adjusting wheel is adjusted to adapt to different pipe diameters of the circular pipe, and the stroke of the hydraulic piston rod is shortened to enable the speed to be higher; the return device assists in pushing the movable body to return, and the movable body and the opening of the main body are separated more quickly; the sliding contact surfaces of the movable body and the main body are provided with linear slideways which are mutually matched, so that the movable body can slide smoothly; when the power motor is a motor, the power motor can be directly connected with a power supply through a circuit or can be provided with a battery, and can also work in places without the power supply.
When the circular tube clamping and rotating device is used for working, a circular tube can be clamped quickly and rotated continuously, time and labor are saved, efficiency is improved, and labor intensity is reduced.
Drawings
FIG. 1 is a schematic structural view of a circular tube clamping and rotating device of the present invention, including a power motor, wherein: the hydraulic clamping device comprises a main body 1, a movable body 2, a rolling wheel 3, a power motor 4, a manual regulating wheel 10, a return device 11, a clamping switch 12, a power switch 13, a hydraulic pump 14, a thread 15, a power transmission mechanism 16 (comprising a torque force regulating mechanism 5, a speed reducing mechanism 6, a flexible shaft 7 and a power clutch device 23), a hydraulic clamping mechanism 17 (comprising a hydraulic cylinder 8 and a hydraulic piston rod 9), a linear slideway 19 and a hydraulic pressure regulating mechanism 27.
Fig. 2 is a schematic structural view of a power motor including a battery when the power motor is a motor, in which: 4 motor, 18 batteries, and the rest of the labels are the same as those in figure 1.
FIG. 3 is a schematic structural view of a circular tube clamping and rotating device of the present invention when connected to a tool connecting device, wherein: 25 tool connection means 26, which is externally connected to the power connector, is identified otherwise as in figure 1.
Fig. 4 is a schematic view showing a structure of coupling the movable body and the main body (sliding while rotating about a fixed axis and coupled), in which: the device comprises a main body 1, a movable body 2, a roller 3, a hydraulic cylinder 8, a hydraulic piston rod 9, a return device 11, a movable body rotating shaft 30, and a hydraulic cylinder rotating shaft 31 or a hydraulic piston rod rotating shaft.
Fig. 5 is a schematic view showing a structure of a movable body and a main body coupled together (rotated and coupled about a fixed axis), in which reference numerals are the same as those in fig. 4.
Fig. 1 and 2 also include schematic views of the connection structure of the movable body and the main body (the movable body slides and is connected to the main body).
Detailed Description
The description is made with reference to the accompanying drawings: a circular tube clamping and rotating device comprises a main body 1, a movable body 2, rolling wheels 3, a power transmission mechanism 16, a power motor 4 (including but not limited to a motor, a pneumatic motor, a hydraulic motor, an internal combustion engine and other power machines) or an external power connector 26, a hydraulic pump 14, a hydraulic cylinder 8 and a hydraulic piston rod 9;
preferably, the movable body 2 rotates and connects around a fixed shaft 30 while the main body 1 slides and connects or rotates around a fixed shaft 30 and connects or slides (various connection methods can be used, and when the connection method shown in fig. 4 or fig. 5 is adopted, the hydraulic cylinder 8 and the hydraulic piston rod 9 simultaneously and correspondingly rotate around the hydraulic cylinder rotating shaft 31 and the hydraulic rod rotating shaft 31, preferably but not limited to slide and connect in fig. 1 and fig. 2), and form an opening, the size of the opening correspondingly changes along with the movable body 2, one or more rolling wheels 3 (preferably but not limited to three or four rolling wheels 3 with the same axis are respectively arranged at the opening of the main body 1 and the movable body 2, when the movable body and the main body are connected in a sliding manner, the sections of the three axes are combined into an isosceles triangle, and the sections of the four axes are combined into a right-angle rectangle, the driving force is uniform, the drawing of the specification uses six rolling wheels 3 with one at each end of three axes to form a rolling wheel combination with the total number more than or equal to three, and the contact surface of the rolling wheels 3 and the pipe fitting can be provided with regular or irregular lines to increase the driving force and prevent slipping;
preferably, the rolling wheels 3 are in transmission connection individually or a plurality of the rolling wheels are in transmission connection with a power transmission mechanism 16 simultaneously, when the power transmission mechanism 16 is connected with the rolling wheels 3 of the main body 1 and the movable body 2 simultaneously, the power transmission mechanism 16 between the movable body 2 and the main body 1 is provided with but not limited to a flexible shaft 7, the action of the power transmission mechanism is that the power transmission mechanism 16 does not hinder the action of the movable body 2, and the power transmission mechanism 16 is in transmission connection with a power motor 4 or an external power connector 26;
preferably, the main body 1 or the movable body 2 is provided with a hydraulic cylinder, the hydraulic piston rod 9 is slidably connected in the hydraulic cylinder 8, the hydraulic pump 14 is connected with the hydraulic cylinder 8 through a pipeline, the hydraulic pump pumps out liquid to push the hydraulic piston rod 9 to slide in the hydraulic cylinder 8, so as to push the movable body 2 to slide or rotate around a fixed shaft 3, and the size of the opening of the main body 1 and the sliding body 2 is changed, the hydraulic pump 14 is driven by the power motor 4 or an external power connector 26 (directly or indirectly) or is driven by self-power, and the self-power driving method comprises but is not limited to adding the power motor, so that the rolling wheels 3 and the hydraulic pump 14 are respectively driven by different power motors 3, and the control is more convenient.
Preferably, the power clutch device 23 is included, the power clutch device 23 is used for cutting off or transmitting power, and includes cutting off or transmitting power of the rolling wheel 3 or power of the hydraulic pump 14 (the figures in this specification only depict the power clutch device for controlling the rolling wheel, and the same device is not described in detail), the power clutch device 23 can be directly operated or operated by connecting with a corresponding switch through a mechanical or circuit, and the implementation method includes but is not limited to the following methods, such as shifting or absorbing the separation and connection of a driving disk or a driven disk (or a driving wheel and a driven wheel of a gear drive) driven by a friction disk through mechanical force or electromagnetic force, such as changing the position of a plunger type hydraulic pump to contact or separate a cam for transmitting power, and the like.
Preferably, the power transmission mechanism 16 is provided with a torque force adjusting mechanism 5 or a speed reducing mechanism 6 or both the torque force adjusting mechanism 5 and the speed reducing mechanism 6, the torque force adjusting mechanism 5 is used for adjusting the driving force transmitted to the rolling wheel 3, the speed reducing mechanism 6 is used for changing the working speed of the rolling wheel 3 or the hydraulic pump 14, and the torque force adjusting mechanism 5 and the speed reducing mechanism 6 are not described in detail in the prior art.
Preferably, the hydraulic pressure adjusting mechanism 27 is included, the connecting pipeline of the hydraulic cylinder 8 and the hydraulic pump 14 is provided with the hydraulic pressure adjusting mechanism 27 for controlling the hydraulic pressure so as to control the clamping pressure, and the implementation method includes but is not limited to that the hydraulic pump has a return hole in the pipeline of the hydraulic cylinder, the return hole is provided with a plug or a ball, a knob screw is connected with an elastic element, the elastic element presses the plug or the ball, the pressure of the elastic element on the plug or the ball can be changed by rotating the knob screw, the pressure of the elastic element is reached or exceeded, and the liquid in the pipeline pushes the plug or the ball to return to the hydraulic pump liquid container from the return hole, so that the pressure can be adjusted and the pressure can be kept constant.
Preferably, a clamping switch 12 is included, and a connecting pipeline of the hydraulic cylinder 8 and the hydraulic pump 14 is provided with the clamping switch 12 for controlling the rolling wheels 3 to clamp and loosen the round pipe, and the sliding and stopping of the hydraulic piston rod 9 and the sliding direction are controlled by controlling the on-off or the change of the direction of the pipeline liquid.
Preferably, a return device 11 is arranged between the main body 1 and the movable body 2, and the return device comprises, but is not limited to, an elastic member or an additional hydraulic cylinder 8 and a hydraulic piston rod 9 for pushing the movable body 2 to return, so that the rolling wheel 3 can be clamped into or taken out of the circular tube more quickly during operation.
Preferably, when the movable body 2 is connected and rotated around a fixed shaft 30 while the main body 1 is connected and slid or connected and the movable body 2 is connected and slid, the movable body 2 is provided with a manual adjusting wheel 10, the movable body 2 and the manual adjusting wheel 10 are provided with threads 15, the manual adjusting wheel 15 rotates on the threads 15 of the movable body 2, and the size of the opening of the movable body 2 and the main body 1 is changed when the manual adjusting wheel 15 is rotated.
Preferably, when the movable body 2 slides and is connected or slides and is connected while rotating and being connected around a fixed shaft 30 while the main body 1 slides and is connected, the sliding contact surfaces of the movable body 2 and the main body 1 are provided with linear slide ways 19 which are matched with each other, so that the sliding friction between the movable body 2 and the main body 1 is reduced, and the sliding is smoother.
Preferably, the power motor 4 is an electric motor and includes a battery 18, the battery 18 being attachable or detachable for use in a non-powered environment.
Preferably, the power transmission mechanism 16 comprises a tool connecting device 25 when being in transmission connection with the external power connector 26, the tool connecting device 25 is connected with and can be detached from the power tool, and the external power connector 26 is in transmission connection with and can be detached from the power part of the power tool 25, so that a new tool can be combined by using the existing tool.
Preferably, the power transmission mechanism 16 transmits power by one or more combinations of existing power transmission modes including, but not limited to, shaft transmission, gear transmission, chain transmission, worm transmission, friction disc transmission, belt transmission, etc.
Preferably, the power motor 4 is a gasoline engine, which can be used for thicker pipes in addition to operating in an environment without a power source.
Preferably, the power switch 13 is included for controlling the rotation and stop of the power motor 4, and the switch and the control component can be respectively arranged at different positions according to requirements, and can also be optimally combined together, so that the operation is more convenient. The connection modes of the pipeline, the switch, the circuit and the like are the prior art and are not described in detail.
The invention has the technical effects and advantages that: a circular tube clamping and rotating device is characterized in that a power motor 4 or an existing power tool drives a hydraulic pump 14 to provide liquid, and a hydraulic piston rod 9 is controlled to slide through a clamping switch 12, so that a rolling wheel 3 can quickly clamp and separate a circular tube; the hydraulic clamping mechanism 17 is adopted, so that the clamping force of the rolling wheel 3 is large; the contact surface of the rolling wheel 3 and the circular tube can be provided with lines to increase the driving force and prevent slipping; be equipped with hydraulic pressure adjustment mechanism 27, can conveniently adjust clamping pressure: the power motor 4 or the external power connector 27 drives the rolling wheels to rotate through the power transmission mechanism 16, so that the circular tube can continuously rotate; the flexible shaft 7 is arranged on the power transmission mechanism 16 of the movable body 2 and the main body 1, so that the rolling wheels of the main body 1 and the movable body 2 can rotate simultaneously, the torsion is increased, and the clamping action of the movable body 2 is not hindered; the power transmission mechanism 16 is provided with a power clutch device 23 which can control the rotation and stop of the rolling wheel 3; the torque adjusting mechanism 5 is adjusted to change the torque of the rolling wheel 3; the manual adjusting wheel 10 is adjusted to adapt to different pipe diameters of the circular pipe, and the stroke of the hydraulic piston rod 9 is shortened to enable the speed to be higher; the return device 11 assists in pushing the movable body 2 to return, so that the movable body 2 and the opening of the main body 1 are separated more quickly; the sliding contact surfaces of the movable body 2 and the main body 1 are provided with linear slide ways 19 which are mutually inosculated, so that the movable body 2 can slide smoothly; when the power motor 4 is an electric motor, it can be directly connected to a power source through an electric circuit or can be provided with a battery 18, and can also work in places without a power source.
When the circular tube clamping and rotating device is used for operation, the manual adjusting wheel 10 is adjusted according to the diameter of a circular tube (the step is omitted when the manual adjusting wheel is not used), the opening of the movable body 2 and the main body 1 is adjusted to be proper in size, the torque force is adjusted by the torque force adjusting mechanism 5, the switch (or the power tool switch) of the power motor 4 is turned on to start working, the circular tube is clamped into the rolling wheel combination, the clamping switch 12 is turned on or pressed down, the hydraulic piston rod 9 slides to enable the movable body 2 to act, the rolling wheel 3 clamps the circular tube, the power clutch device 23 is turned on, the rolling wheel 3 drives the circular tube to continuously rotate, after the torque force is achieved, the rolling wheel automatically stops rotating, the clamping switch 12 is turned off or loosened, the rolling wheel 3 is separated from the circular tube, the circular tube clamping and rotating device is taken down from the circular tube, all switches are turned off, and the work is completed. The round tube clamping and rotating device can be used for rapidly clamping and continuously rotating round tubes, time and labor are saved, efficiency is improved, and labor intensity is reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A circular tube clamping and rotating device comprises a main body, a movable body, rolling wheels, a power transmission mechanism and a hydraulic clamping mechanism, wherein the hydraulic clamping mechanism comprises a hydraulic pump, a hydraulic cylinder and a hydraulic piston rod; the method is characterized in that:
the movable body slides on the main body and is connected with the main body to form an opening, or the movable body rotates around a fixed shaft while sliding on the main body and is connected with the main body to form an opening, the size of the opening is changed along with the movement of the movable body on the main body, one or more rolling wheels are respectively arranged and rotatably connected at the openings of the main body and the movable body, and a combination of three rolling wheels with the total number being more than or equal to three is formed;
the rolling wheels are connected with the power transmission mechanism independently or simultaneously;
the main part or the movable body are provided with a hydraulic pump and a hydraulic cylinder, a hydraulic piston rod is connected in the hydraulic cylinder in a sliding mode, the hydraulic pump is connected with the hydraulic cylinder through a pipeline, and the hydraulic pump is connected with a power transmission mechanism in a driving mode.
2. A circular tube clamping and rotating device as claimed in claim 1, wherein the power transmission mechanism is provided with a power clutch device, and the power clutch device can be directly operated or connected with a corresponding mechanical switch or an electronic switch through a mechanical or circuit for operation.
3. The round tube clamping and rotating device as claimed in claim 1, which comprises a hydraulic pressure adjusting mechanism, wherein the hydraulic pressure adjusting mechanism connects the hydraulic cylinder and the hydraulic pump through a pipeline.
4. The round tube clamping rotating device as claimed in claim 1, which comprises a clamping switch, wherein the clamping switch is connected with the hydraulic cylinder and the hydraulic pump through pipelines.
5. The round tube clamping and rotating device as claimed in claim 1, wherein when the power transmission mechanism is connected with the main body and the movable body roller, the power transmission mechanism between the movable body and the main body is provided with a flexible shaft.
6. A round tube clamping and rotating device as claimed in claim 1, wherein the power transmission mechanism is provided with a torque adjusting mechanism, and the power transmission mechanism is provided with a speed reducing mechanism.
7. The round tube clamping and rotating device as claimed in claim 1, wherein a return device is provided between the main body and the movable body, when the movable body slides and is connected to the main body or rotates and is connected to the main body around a fixed axis, the movable body is provided with a manual adjusting wheel, the movable body and the manual adjusting wheel are provided with threads, the manual adjusting wheel rotates on the threads of the movable body, the sliding contact surfaces of the movable body and the main body are provided with linear slideways which are matched with each other, and the idler wheel is provided with anti-skid lines on the contact surface with the workpiece.
8. A pipe gripping and rotating device according to any one of claims 1 to 7, comprising an electric tool connecting device or a pneumatic tool connecting device, wherein one end of the power connecting part is in transmission connection with the power transmission mechanism, the other end of the power connecting part is in transmission connection with an electric tool or a pneumatic tool, and the electric tool or the pneumatic tool connecting device is connected with the electric tool or the pneumatic tool housing.
9. A pipe gripping and rotating device according to any one of claims 1 to 7, including a power motor (electric or pneumatic or hydraulic or petrol), the power transmission being in power transmission connection with the power motor.
10. A pipe gripping and rotating device according to any one of claims 1 to 7, including a battery and a motor, the power transmission mechanism being in power transmission connection with the motor, the battery being attachable or detachable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110316392.2A CN115122269A (en) | 2021-03-25 | 2021-03-25 | Round tube clamping and rotating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110316392.2A CN115122269A (en) | 2021-03-25 | 2021-03-25 | Round tube clamping and rotating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115122269A true CN115122269A (en) | 2022-09-30 |
Family
ID=83374576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110316392.2A Pending CN115122269A (en) | 2021-03-25 | 2021-03-25 | Round tube clamping and rotating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115122269A (en) |
-
2021
- 2021-03-25 CN CN202110316392.2A patent/CN115122269A/en active Pending
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