CN216577458U - Cylinder bottom positioning and calibrating device - Google Patents
Cylinder bottom positioning and calibrating device Download PDFInfo
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- CN216577458U CN216577458U CN202122953867.7U CN202122953867U CN216577458U CN 216577458 U CN216577458 U CN 216577458U CN 202122953867 U CN202122953867 U CN 202122953867U CN 216577458 U CN216577458 U CN 216577458U
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Abstract
A cylinder bottom positioning and calibrating device comprises a base, a turning and pressing assembly, a first detection switch, a three-jaw centering assembly, a two-jaw centering assembly, a workpiece cache support, a second detection switch, an electrical control box and a control unit, wherein the turning and pressing assembly, the three-jaw centering assembly and the workpiece cache support are sequentially arranged on the base; the first detection switch is arranged on one side of the three-jaw centering assembly; the second detection switch is arranged on the workpiece cache bracket; the two-jaw centering assembly is arranged on one side of the three-jaw centering assembly opposite to the first detection switch; the electric control box is arranged inside the base; the control unit is in communication connection with the first detection switch, the second detection switch and the electric control box. The utility model can accurately ensure the relative position precision of the cylinder bottom workpiece.
Description
Technical Field
The utility model relates to the technical field of mechanical automation, in particular to a cylinder bottom positioning and calibrating device, which aims to realize the accuracy of installing and placing a cylinder bottom workpiece by a manipulator.
Background
The cylinder body part of the oil cylinder used in engineering machinery such as a crane, an excavator and the like is long and heavy, the requirement on the coaxiality of a cylinder bottom workpiece and a cylinder barrel workpiece before welding is high, and if the coaxiality of the cylinder bottom workpiece and the cylinder barrel workpiece before welding cannot be controlled within the range of the design requirement, a great hidden danger of breakage exists in the later application process. How to efficiently and accurately assemble the cylinder bottom workpiece and the cylinder barrel workpiece under the condition of ensuring the precision is always a difficult problem troubling factory manufacture.
Under the condition of the prior art, the cylinder bottom workpiece is installed by workers, the requirements on the initial posture and the initial position of the cylinder bottom are low, the cylinder bottom workpiece does not need to be judged to be accurate in position, and the cylinder bottom workpiece is corrected and installed by the workers in the installation process.
However, in the implementation of an automated installation scheme, when the manipulator replaces manual work to install the cylinder bottom workpiece, the accuracy of the initial posture and the initial position of the cylinder bottom workpiece greatly affects whether the cylinder bottom workpiece can be accurately installed in place.
In an actual production site, the cylinder bottom workpieces are uniformly placed on the cylinder bottom tray by workers and then are conveyed to a waiting manipulator grabbing work area by an AGV trolley, and the cylinder bottom workpieces cannot be accurately positioned in the tray, so that when the manipulator grabs the cylinder bottom workpieces, the relative positions of the cylinder bottom workpieces and the manipulator grippers are very random, and the manipulator cannot accurately install the cylinder bottom workpieces at a preset position.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects in the prior art, the utility model aims to provide a cylinder bottom positioning and calibrating device which can accurately ensure the relative position accuracy of a cylinder bottom workpiece.
In order to achieve the purpose, the utility model provides a cylinder bottom positioning and calibrating device, which comprises a base, a turnover pressing component, a first detection switch, a three-jaw centering component, a two-jaw centering component, a workpiece caching bracket, a second detection switch, an electric control box and a control unit, wherein,
the overturning and pressing assembly, the three-jaw centering assembly and the workpiece caching bracket are sequentially arranged on a base;
the first detection switch is arranged on one side of the three-jaw centering assembly;
the second detection switch is arranged on the workpiece caching bracket;
the two-claw centering assembly is arranged on one side of the three-claw centering assembly opposite to the first detection switch;
the electric control box is arranged inside the base;
the control unit is in communication connection with the first detection switch, the second detection switch and the electric control box.
Furthermore, the turnover pressing assembly also comprises a turnover mechanism bracket, a turnover mechanism, a double-guide-rod cylinder and a pressing plate, wherein,
the turnover mechanism bracket is fixed on the upper surface of the base;
one end of the turnover mechanism is fixedly connected to the turnover mechanism bracket;
the other end of the turnover mechanism is fixedly connected with the cylinder body of the double-guide-rod cylinder;
the pressure plate is connected with the guide rods of the double-guide-rod air cylinder.
Furthermore, the three-jaw centering assembly also comprises a supporting plate, a three-jaw clamping finger, a pneumatic three-jaw chuck and a pressure regulating valve, wherein,
the supporting plate is arranged on the base;
the three-jaw chuck fingers are arranged on the pneumatic three-jaw chuck;
the pressure regulating valve is arranged in the gas path of the pneumatic three-jaw chuck and used for regulating the pressure in the gas path of the pneumatic three-jaw chuck and controlling the tightening force of the pneumatic three-jaw chuck.
Furthermore, the two-jaw centering assembly also comprises two-jaw clamping fingers, a pneumatic two-jaw chuck, a hand wheel and a guide rail screw rod assembly, wherein,
the two-jaw clamping fingers are arranged on the pneumatic two-jaw chuck;
the pneumatic two-jaw chuck is arranged on a lead screw of the hand wheel and the guide rail lead screw assembly, and slides linearly along the guide rail of the hand wheel and the guide rail lead screw assembly under the drive of the lead screw.
Further, the two claw clamping fingers clamp the process excircle of the cylinder bottom workpiece during working.
Further, the first detection switches are proximity detection switches, and the number is 2.
Further, the second detection switches are correlation detection switches, and the number is 2.
Further, after receiving the first detection switch signal, the control unit controls the manipulator to grab the cylinder bottom workpiece from the workpiece buffer bracket.
Compared with the prior art, the cylinder bottom positioning and calibrating device has the following beneficial effects: the precision of the relative position of the cylinder bottom workpiece can be accurately ensured, so that the precision of the relative position of the grabbing position and the cylinder bottom workpiece is ensured after the manipulator grabs the cylinder bottom workpiece again, and the precision of the workpiece placed by the manipulator is ensured.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a perspective view of a cylinder bottom positioning and calibrating device according to the present invention;
FIG. 2A is a side view of a workpiece to be calibrated using the cylinder bottom positioning and calibrating device of the present invention;
FIG. 2B is a front view of a workpiece to be calibrated using the cylinder bottom positioning and calibrating device of the present invention;
FIG. 2C is a top view of a workpiece to be calibrated using the cylinder bottom positioning and calibrating device of the present invention
Fig. 3 is a schematic operation flow chart of the cylinder bottom positioning and calibrating device according to the utility model.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Interpretation of terms
A cylinder bottom workpiece: the bottom of an oil cylinder in the engineering machinery to be processed;
cylinder barrel work piece: the cylinder barrel body of the oil cylinder in the engineering machinery to be processed is in a hollow cylinder shape.
Fig. 1 is a schematic perspective view of a cylinder bottom positioning and calibrating device according to the present invention, and as shown in fig. 1, the cylinder bottom positioning and calibrating device of the present invention comprises a base 1, a turnover mechanism support 2, a turnover mechanism 3, a double-guide-rod cylinder 4, a pressing plate 5, a detection switch 6, a supporting plate 7, a three-jaw chuck 8, a pneumatic three-jaw chuck 9, a two-jaw chuck 10, a pneumatic two-jaw chuck 11, a workpiece buffer support 12, a detection switch 13, a hand wheel and guide-rail screw assembly 14, an electric control box 15, a pressure regulating valve 16 and a control unit (not shown), wherein,
the turnover mechanism bracket 2, the turnover mechanism 3, the double-guide-rod cylinder 4 and the pressing plate 5 jointly form a turnover pressing assembly. The overturning pressing assembly is arranged on the base 1. The turnover mechanism bracket 2 is fixed on the upper surface of the base 1. One end of the turnover mechanism 3 is fixedly connected to the turnover mechanism bracket 2, and the other end is fixedly connected with the double-guide-rod cylinder 4. The guide rod of the double-guide-rod cylinder 4 is connected with a pressure plate 5. The turnover mechanism 3 can perform turnover motion, and then drives the double-guide-rod cylinder 4 to perform turnover motion. When the turnover mechanism 3 is turned over in place, the double-guide-rod air cylinder 4 supplies air to drive the pressing plate 6 to press the working surface of the cylinder bottom workpiece. The utility model utilizes the turnover pressing component to calibrate the symmetry requirement of the upper surface and the lower surface of the cylinder bottom workpiece relative to the center of the cylinder bottom workpiece.
The supporting plate 7, the three-jaw clamping fingers 8, the pneumatic three-jaw chuck 9 and the pressure regulating valve 16 form a three-jaw centering assembly. A three-jaw centering assembly is disposed on the base 1 proximate to the flip-flop compacting assembly. The pallet 7 is disposed on the base 1. The three-jaw clamping fingers 8 are arranged on the pneumatic three-jaw chuck 9, the three-jaw gas circuit is provided with a pressure regulating valve, the pressure of the three-jaw gas circuit can be regulated, the tightening force of the three jaws can be controlled, and the damage to the inner surface of a workpiece caused by too large internal supporting force of the three jaws can be avoided.
The three-jaw centering assembly is used for calibrating the center position of the cylinder bottom workpiece, so that the position precision of the cylinder bottom workpiece in time synchronization relative to the cylinder barrel workpiece is ensured, and the cylinder bottom workpiece can be successfully paired with the cylinder barrel workpiece.
The two-jaw clamping finger 10, the pneumatic two-jaw chuck 11 and the hand wheel and guide rail screw rod assembly 14 jointly form a two-jaw centering assembly. The two-jaw centering assembly is arranged on one side of the three-jaw centering assembly, and the advancing direction of the hand wheel and guide rail screw assembly 14 is perpendicular to the plane of the motion track of the turnover mechanism 3. The two claw centering assemblies calibrate the axis of the cylinder bottom workpiece to be parallel to the axis of the tool. The hand wheel and guide screw assembly 14 is used for controlling the position of the pneumatic two-jaw chuck 11, and is convenient to adjust so as to meet the calibration requirements of different workpieces. The pneumatic two-jaw chuck 11 is arranged on a guide rail which is driven by a lead screw and can slide linearly in a hand wheel and guide rail lead screw assembly 14, and the central line of the guide rail along the motion direction is vertical to the central line of the pneumatic three-jaw chuck. The position of the pneumatic two-jaw chuck 11 is adjusted by manually shaking the hand wheel so as to meet the production requirements of various workpieces.
The two-claw centering assembly is used for calibrating the axis position of the cylinder bottom workpiece, so that the coaxiality requirement of the cylinder bottom workpiece relative to the axis of the cylinder barrel workpiece is ensured, and the cylinder bottom workpiece and the cylinder barrel workpiece can be successfully assembled.
A detection switch 6 is arranged on one side of the three-jaw centering assembly opposite to the two-jaw centering assembly, and the detection switch 6 adopts a proximity detection switch for preliminary leveling and calibration before the cylinder bottom workpiece is placed on the three-jaw centering assembly by a manipulator, so that the manipulator can smoothly place the cylinder bottom workpiece on the three-jaw centering assembly, and the cylinder bottom workpiece cannot be placed in the three-jaw centering assembly due to inclination of the cylinder bottom workpiece. The number of the detection switches 6 is 2, the positions of the two detection switches 6 are in horizontal positions, and when only the cylinder bottom workpiece is horizontal, the two detection switches 6 simultaneously have signals, namely, if the plane to be detected is not in the horizontal state, the two detection switches do not simultaneously have signals; the two detection switches 6 are used for fine-tuning the horizontal state of the plane to be measured.
And a workpiece caching bracket 12 and a detection switch 13 are arranged on one side of the three-jaw centering assembly opposite to the overturning and pressing assembly. The workpiece buffer storage support 12 is provided with a cylinder bottom workpiece to be calibrated, and the detection switch 13 arranged on the workpiece buffer storage support 12 is a correlation switch and used for detecting whether a buffer storage position has a workpiece or not, judging whether the workpiece exists or not, monitoring whether the workpiece exists or not in real time, and ensuring the accuracy and effectiveness of operation of the manipulator. A pair of detection switches 13 is provided on each workpiece buffer holder 12.
An electrical control box 15 is provided inside the base.
The input end of the control unit is connected with the detection switch 6 and the detection switch 13 in a communication way and is used for receiving the detection signal of the detection switch. The output of the control unit is connected in communication with an electrical control box 15.
The device is provided with two proximity detection switches for the manipulator to preliminarily level and calibrate before the workpiece is placed in the three-jaw calibration mechanism, so that the manipulator can smoothly place the workpiece in the three-jaw calibration mechanism, and the condition that the cylinder bottom cannot be placed in the three-jaw calibration mechanism due to the inclination of the cylinder bottom is avoided.
Further description is provided below in connection with the tape calibration artifact. Fig. 2A is a side view of a workpiece to be calibrated by using the cylinder bottom positioning and calibrating device of the present invention, fig. 2B is a front view of the workpiece to be calibrated by using the cylinder bottom positioning and calibrating device of the present invention, and fig. 2C is a top view of the workpiece to be calibrated by using the cylinder bottom positioning and calibrating device of the present invention. As can be seen from fig. 2A-2C, the geometric features of the workpiece to be calibrated include the relative positional accuracy between the inner circle a, the axis B, the plane C, and the outer circle D, where the inner circle a is a hole for the rotating shaft of the cylinder bottom workpiece; the axis B is an external tool axis used for aligning the axes of the inner holes of the cylinder bottom workpiece and the cylinder barrel workpiece, and the cylinder bottom workpiece and the cylinder barrel workpiece are assembled to form the superposition of the respective axes of the cylinder bottom workpiece and the cylinder barrel workpiece and the tool axis B; the plane C is a plane above the plane where the two claw fingers are clamped in the tangent plane of the cylinder bottom workpiece cylinder part and is parallel to the supporting plate 7; and the excircle D is a process excircle and is mainly used for calibrating the axis of the cylinder bottom workpiece and grabbing by a manipulator.
The cylinder bottom workpiece grabbed by the manipulator from the workpiece tray has high random pose, and if the cylinder bottom workpiece is inclined, the cylinder bottom workpiece can interfere with the three-jaw clamping finger when being grabbed and placed, so that the possibility of damaging the device is caused. For this reason, the posture of the cylinder bottom held by the robot hand is corrected by the two detection switches provided before the cylinder bottom work is placed on the pallet 7, so as to ensure that the cylinder bottom work can be smoothly placed on the pallet 7.
The three-jaw centering assembly accurately positions and aligns the center inner circle A of the cylinder bottom workpiece according to the three-jaw centering principle. Specifically, the three-jaw snap fingers 8 start to be tensioned under the driving of the pneumatic three-jaw chuck 9, and the position of the inner circle a of the cylinder bottom workpiece placed on the supporting plate 7 is aligned by using the three-jaw aligning principle.
After the position of the inner circle A is aligned, the two claw clamping fingers clamp the outer circle D of the cylinder bottom workpiece, the position of the central axis of the cylinder bottom workpiece is aligned, and the tool axis B and the outer circle D of the cylinder bottom workpiece are corrected and calibrated through the two claw centering principle.
A pressing plate 6 in the turnover pressing assembly presses a plane C of the cylinder bottom workpiece under the sequential action of the turnover mechanism 3 and the double-guide-rod air cylinder 4, so that the cylinder bottom workpiece is ensured not to be inclined, and the symmetry of the cylinder bottom workpiece C and an axis B is aligned. The cylinder bottom plane C is tightly pressed through the turnover mechanism 3 and the double-guide-rod cylinder 4, and the plane C of the cylinder bottom workpiece is calibrated in parallel relative to the tool axis B.
Fig. 3 is a schematic operation flow chart of the cylinder bottom positioning and calibrating device according to the utility model. Wherein the content of the first and second substances,
in the state shown by the sequence number (I), the pneumatic three-jaw chuck 9 and the double-guide-rod cylinder 4 are both in a retraction state; the turnover mechanism 3 is opened; the pneumatic two-jaw chuck 11 is opened.
In the state shown by the serial number II, the manipulator grabs the cylinder bottom workpiece and places the cylinder bottom workpiece on the workpiece cache bracket 12, the workpiece detection switch 13 detects the cylinder bottom workpiece, the workpiece detection switch 13 has a signal, and the signal is fed back to the control unit.
Under the state shown in sequence number (C), the manipulator grabs the cylinder bottom workpiece, and the cylinder bottom plane C is leveled through the two detection switches 6: when the plane C of the cylinder bottom workpiece is not in a horizontal state, signals are provided when the two detection switches are different, the postures of the manipulator are adjusted until the two cylinder bottom workpieces are detected simultaneously, the signals are generated and fed back to the control unit, the plane C is basically in a state required by design at the moment, and the control unit controls the manipulator to place the cylinder bottom workpieces on the supporting plate 7.
Under the state shown by the sequence number (r), the manipulator places the cylinder bottom workpiece on the supporting plate 7 after leveling the plane C of the cylinder bottom workpiece, the manipulator moves away, the pneumatic three-jaw chuck 9 supplies air, the pneumatic three-jaw chuck 9 starts to be tensioned, the three-jaw clamping fingers 8 contact the inner circle A of the cylinder bottom workpiece, and the position of the inner circle A of the cylinder bottom workpiece is aligned by utilizing the three-jaw aligning principle; meanwhile, the pneumatic two-jaw chuck 11 supplies air to drive the two-jaw clamping fingers 10 to clamp the excircle D of the cylinder bottom workpiece and align the central axis position of the cylinder bottom workpiece.
And in the state shown by the serial number fifthly, the turnover mechanism 3 supplies air to drive the double-guide-rod air cylinder 4 to turn over, the double-guide-rod air cylinder 4 supplies air to drive the pressing plate 6 to tightly press the plane C of the cylinder bottom workpiece, so that the cylinder bottom workpiece is ensured not to be inclined, and the symmetry of the plane C of the cylinder bottom workpiece and the axis B of the tool is aligned.
Through the alignment process, the relative positions of the inner circle A, the axis B, the plane C and the outer circle D of the cylinder bottom workpiece are completely aligned and fixed; the manipulator drives the gripper installed on the manipulator to grab the cylinder bottom workpiece through the excircle D, so that the gripper can be accurately installed at a corresponding position, and the precision and the success rate of the assembly of the cylinder bottom workpiece and the cylinder barrel are ensured.
This device need carry out error calibration to interior circle A, axis B, plane C and excircle D simultaneously, need carry out substep operation control to pneumatic three-jaw chuck 9, pneumatic two-jaw chuck 11, tilting mechanism 3 and two guide arm cylinders 4 operation order to rise to pneumatic three-jaw chuck 9 and increase the pressure regulating setting. Through controlling the air passage pressure of the pneumatic three-jaw chuck, when the three-jaw clamping fingers 8 are tensioned to the inner circle A, the position relation among the tool axis B, the outer circle D and the plane C can be adjusted by pressing the outer circle D and the plane C, and the problem that the pneumatic two-jaw chuck 11 and the double-guide-rod air cylinder 4 cannot drive a cylinder bottom workpiece to be adjusted due to too large tensioning force of the three-jaw clamping fingers is avoided. The pressure regulating device arranged in the device is a pressure regulating valve 16.
It should be noted that, in order to maintain the positioning accuracy, when the robot grips the positioned cylinder bottom workpiece and performs the next process, the following operations should be performed: firstly, the two-jaw clamping fingers 10 are driven to open by the pneumatic two-jaw chuck 11, the mechanical arm clamps the excircle D of the cylinder bottom workpiece at the original acting position of the two-jaw clamping fingers 10, after the mechanical arm clamps the excircle D of the cylinder bottom workpiece, the pressing plate 6 leaves the plane C under the action of the double-guide-rod cylinder 4, and then the turnover mechanism 3 deflates to drive the double-guide-rod cylinder 4 and the pressing plate 6 to reset.
The device of the utility model preliminarily corrects the inclination of the cylinder bottom workpiece plane C in a mode of simultaneously detecting the cylinder bottom workpiece plane by using two detection switches so as to ensure that the cylinder bottom workpiece can be smoothly and effectively placed on the three-jaw supporting plate; respectively calibrating the position relation of an inner circle A, an outer circle D and a tool axis B of the cylinder bottom workpiece by utilizing three-jaw centering and two-jaw centering principles; the mode that the turnover mechanism and the double-guide-rod mechanism compress the upper plane of the workpiece is adopted, the position of the plane C is calibrated, the overall structure design is simple, safety and reliability are realized, and the precision and the success rate of the assembly of the follow-up cylinder bottom and the cylinder body in the full-automatic production process are greatly ensured in practical application.
Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A cylinder bottom positioning and calibrating device is characterized by comprising a base, a turnover pressing component, a first detection switch, a three-jaw centering component, a two-jaw centering component, a workpiece cache bracket, a second detection switch, an electric control box and a control unit, wherein,
the overturning and pressing assembly, the three-jaw centering assembly and the workpiece cache bracket are sequentially arranged on a base;
the first detection switch is arranged on one side of the three-jaw centering assembly;
the second detection switch is arranged on the workpiece caching bracket;
the two-claw centering assembly is arranged on one side of the three-claw centering assembly opposite to the first detection switch;
the electric control box is arranged inside the base;
the control unit is in communication connection with the first detection switch, the second detection switch and the electric control box.
2. The cylinder bottom positioning and calibrating device according to claim 1, wherein the turnover pressing assembly further comprises a turnover mechanism bracket, a turnover mechanism, a double-guide-rod cylinder and a pressing plate, wherein,
the turnover mechanism bracket is fixed on the upper surface of the base;
one end of the turnover mechanism is fixedly connected to the turnover mechanism bracket;
the other end of the turnover mechanism is fixedly connected with the cylinder body of the double-guide-rod cylinder;
the pressure plate is connected with the guide rods of the double-guide-rod cylinder.
3. The cylinder bottom positioning and calibrating device according to claim 1, further comprising a support plate, a three-jaw snap finger, a pneumatic three-jaw chuck, and a pressure regulating valve, wherein,
the supporting plate is arranged on the base;
the three-jaw chuck fingers are arranged on the pneumatic three-jaw chuck;
the pressure regulating valve is arranged in the gas path of the pneumatic three-jaw chuck and used for regulating the pressure in the gas path of the pneumatic three-jaw chuck and controlling the tightening force of the pneumatic three-jaw chuck.
4. The cylinder bottom positioning and calibrating device of claim 1, wherein said two jaw centering assembly further comprises two jaw fingers, a pneumatic two jaw chuck, and a hand wheel and lead screw assembly, wherein,
the two-jaw clamping fingers are arranged on the pneumatic two-jaw chuck;
the pneumatic two-jaw chuck is arranged on a lead screw of the hand wheel and the guide rail lead screw assembly, and slides linearly along the guide rail of the hand wheel and the guide rail lead screw assembly under the drive of the lead screw.
5. The cylinder bottom positioning and calibrating device according to claim 4, wherein the two clamping fingers clamp the outer ring of the cylinder bottom workpiece during operation.
6. The cylinder bottom positioning and calibrating device according to claim 1, wherein the first detecting switches are proximity detecting switches, and the number is 2.
7. The cylinder bottom positioning and calibrating device according to claim 1, wherein the second detecting switches are correlation type detecting switches, and the number is 2.
8. The cylinder bottom positioning and calibrating device according to claim 1, wherein the control unit controls the manipulator to grab the cylinder bottom workpiece from the workpiece buffer bracket after receiving the first detection switch signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122953867.7U CN216577458U (en) | 2021-11-29 | 2021-11-29 | Cylinder bottom positioning and calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122953867.7U CN216577458U (en) | 2021-11-29 | 2021-11-29 | Cylinder bottom positioning and calibrating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216577458U true CN216577458U (en) | 2022-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122953867.7U Active CN216577458U (en) | 2021-11-29 | 2021-11-29 | Cylinder bottom positioning and calibrating device |
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| Country | Link |
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| CN (1) | CN216577458U (en) |
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- 2021-11-29 CN CN202122953867.7U patent/CN216577458U/en active Active
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