A clamp system based on pressure online monitoring

Abstract

The present application relates to a kind of clamp systems based on pressure online monitoring, including tray, draw peg and clamp shell;Draw peg is coaxial with tray by bolt connection, and enter the inside of clamp shell by the central through-hole of clamp shell;Tray and clamp shell are positioned by two pairs of above-mentioned rectangular boss and rectangular groove cooperation;When positioning, the area of the side wall of each rectangular groove and rectangular boss is all positioning pressure sensing area;Or including steel ball and piston;The number of steel ball is n and is circumferentially arrayed, n is positive integer greater than 1;The conical annular area of piston and steel ball contact is all clamping pressure sensing area;Positioning pressure sensing area and clamping pressure sensing area are all formed by laying film type pressure sensor after opening installation groove.The clamp system of the present application can carry out real-time online feedback to positioning accuracy and clamping strength.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-end processing and manufacturing equipment, and relates to a clamp system based on pressure online monitoring. BACKGROUND

[0002] The quick-change clamp based on zero-point positioning technology can install parts outside the machine, transfer most of the clamping debugging time to outside the machine tool, enable machining and clamping to be performed simultaneously, reduce machine downtime waiting time, and solve the flexible replacement problem between different parts and different machine tools through the mounting interface of the unified clamp and the universal zero-point positioning base, break the traditional specialized workshop production mode, meet the flexible processing demand of dynamic configuration and reconfiguration in the processing process, and lay a foundation for automatic feeding and discharging of key processes and equipment intelligent units.

[0003] However, the existing zero-point positioning quick-change clamp system only realizes positioning and locking functions through mechanical structure, and lacks feedback on clamping reliability, especially positioning accuracy and clamping strength, in the actual clamping process.

[0004] In the process of automation application, the existing clamp system lacks information exchange and feedback, and when problems such as positioning tolerance, over-positioning, insufficient clamping strength, uneven clamping force distribution, etc. occur in the clamp system, it cannot transmit early warning information and cannot be adjusted in time, thereby causing unbalanced production capacity, low equipment utilization rate, poor processing quality and other automation application bottlenecks.

[0005] Therefore, it is of great significance to research a clamp system based on pressure online monitoring to solve the problem that the existing clamp system cannot provide real-time feedback when problems such as positioning tolerance, over-positioning, insufficient clamping strength, and uneven clamping force distribution occur. SUMMARY

[0006] To solve the problems in the prior art, the application provides a clamp system based on pressure online monitoring.

[0007] To achieve the above-mentioned purposes, the technical solutions adopted by the application are as follows:

[0008] A clamp system based on pressure online monitoring, comprising a tray, a drawbar and a clamp shell; the drawbar is coaxially connected with the tray through a bolt and enters the inside of the clamp shell through the center through hole of the clamp shell; the tray and the clamp shell are positioned through two pairs of rectangular bosses and rectangular grooves that cooperate with each other;

[0009] The side wall of each rectangular groove is fully a positioning pressure sensing area in the area where the rectangular boss is attached;

[0010] The positioning pressure sensing area is formed by laying a thin film pressure sensor in a rectangular mounting groove opened on the side wall of the rectangular recess, the thin film pressure sensor is attached to the groove bottom of the rectangular mounting groove, and the thickness of the thin film pressure sensor is the same as the depth of the rectangular mounting groove.

[0011] As a preferred technical solution:

[0012] The thin film pressure sensor has a thickness of 1 mm and is formed by a piezoelectric sensor unit with a thickness of 1 mm, and each piezoelectric sensor unit of the thin film pressure sensor can measure the pressure value in an area of 0.2 mm*0.2 mm.

[0013] The rectangular boss is arranged on the surface of the tray facing the clamp shell, and the rectangular recess is arranged on the surface of the clamp shell facing the tray.

[0014] The rectangular boss and the rectangular recess are four pairs; the four rectangular bosses are uniformly arranged in a circumferential array, and the four rectangular recesses are distributed on four sides of a cross shape, and the center of the cross shape is located on the central axis of the clamp shell.

[0015] One end of the four rectangular bosses extends to the bolt, and the other end extends to the edge of the tray, that is, the length of the rectangular boss is close to the radius of the tray; one end of the four rectangular recesses extends to the central through hole of the clamp shell, and the other end extends to the edge of the clamp shell; the width of each rectangular recess is one tenth of the diameter of the clamp shell.

[0016] The height of the rectangular boss is half the depth of the rectangular recess matched therewith, so that the positioning and cooperation of the rectangular boss and the rectangular recess are stable, and over-positioning deformation of the mechanism itself due to excessive insertion depth of the rectangular boss can be avoided; the upper half of the two side wall surfaces of each rectangular recess is a positioning pressure sensing area, and the position (position on the groove radius) of the cooperation of the rectangular boss and the rectangular recess can be enlarged or reduced according to the use of different trays, if the upper half of the two side wall surfaces of each rectangular recess is a positioning pressure sensing area, the rectangular recess can cooperate with more sizes of trays, and it is more conducive to the machining of the rectangular recess and the installation of the thin film pressure sensor.

[0017] The application also provides a clamp system based on online pressure monitoring, comprising a steel ball and a piston; the number of steel balls is n and they are distributed in a circumferential array, n is a positive integer greater than 1; the conical annular surface of the piston in contact with the steel ball is a clamping pressure sensing area.

[0018] The clamping pressure sensing area is formed by laying a thin film pressure sensor in a rectangular mounting groove on the side wall of the rectangular recess after the rectangular mounting groove is opened, the thin film pressure sensor is attached to the groove bottom of the rectangular mounting groove, and the thickness of the thin film pressure sensor is the same as the depth of the rectangular mounting groove.

[0019] As a preferred technical solution:

[0020] The clamp system based on online pressure monitoring as described above further comprises a tray, a drawbar and a clamp shell; the drawbar is coaxially connected with the tray through bolts and enters the inside of the clamp shell through the central through hole of the clamp shell; the tray and the clamp shell are positioned by two pairs of rectangular bosses and rectangular grooves cooperating with each other;

[0021] The area of the side wall of each rectangular groove that is attached to the rectangular boss during positioning is a positioning pressure sensing area;

[0022] The positioning pressure sensing area is formed by laying a thin film pressure sensor in a rectangular mounting groove on the side wall of the rectangular recess after the rectangular mounting groove is opened, the thin film pressure sensor is attached to the groove bottom of the rectangular mounting groove, and the thickness of the thin film pressure sensor is the same as the depth of the rectangular mounting groove.

[0023] The clamp system based on online pressure monitoring as described above, the drawbar is provided with an inner concave arc-shaped rotary body structure, which cooperates with the steel balls arranged in a circumferential array, the clamping force is transmitted to the drawbar through the steel balls to achieve clamping of the drawbar.

[0024] The clamp system based on online pressure monitoring as described above further comprises a steel ball holder; the steel ball holder is uniformly arranged with n through holes in the radial direction for fixing the positions of the n steel balls; the diameter of the through hole on the outer side surface of the steel ball holder is 0.2 mm larger than the diameter of the steel ball, which ensures that the steel ball can be put into the corresponding through hole from the outer side surface of the steel ball holder; the diameter of the through hole on the inner side surface of the steel ball holder is 0.2 mm smaller than the diameter of the steel ball, which ensures that the steel ball can be stretched out from the inner side surface of the steel ball holder after being put into the through hole but not completely dropped out, thereby fixing the position of the steel ball during operation of the clamp; the piston is coaxially arranged between the clamp shell and the steel ball holder and is installed therebetween.

[0025] The clamp system based on online pressure monitoring as described above further comprises a spring; the spring is arranged in a circumferential array between the piston and the clamp shell, m is a positive integer greater than 1, the spring is compressed, the piston is pushed downward, the steel ball is retracted toward the center and clamps the drawbar, and the clamping function of the clamp system is realized.

[0026] The clamp system based on pressure online monitoring as described above further comprises a piston stop ring; the piston stop ring is installed at a corresponding clamping groove of the piston contact surface of the clamp shell, and the movement stroke of the piston is limited through the interference of the mechanical structure.

[0027] The clamp system based on pressure online monitoring as described above, the thickness of all the thin film pressure sensors is 1mm, and the thin film pressure sensor is formed by a piezoelectric sensor unit with the same thickness of 1mm; each piezoelectric sensor unit of the thin film pressure sensor can measure the pressure value in an area of 0.2mm*0.2mm.

[0028] The clamp system based on pressure online monitoring as described above, the rectangular boss is arranged on the surface of the tray facing the clamp shell, and the rectangular groove is arranged on the surface of the clamp shell facing the tray.

[0029] The clamp system based on pressure online monitoring as described above, there are four pairs of rectangular bosses and rectangular grooves; the four rectangular bosses are uniformly arranged in a circumferential array, and the four rectangular grooves are distributed on four sides of a cross shape, and the center of the cross shape is located on the central axis of the clamp shell.

[0030] The clamp system based on pressure online monitoring as described above, one end of the four rectangular bosses extends to the bolt, and the other end extends to the edge of the tray, that is, the length of the rectangular boss is close to the radius of the tray; one end of the four rectangular grooves extends to the central through hole of the clamp shell, and the other end extends to the edge of the clamp shell; the width of each rectangular groove is one tenth of the diameter of the clamp shell.

[0031] The clamp system based on pressure online monitoring as described above, the height of the rectangular boss is half of the depth of the rectangular groove matched with the rectangular boss, so that the positioning and cooperation of the rectangular boss and the rectangular groove are stable, and the over-positioning deformation of the mechanism itself caused by the insertion depth of the rectangular boss is avoided; the upper half of the two side walls of each rectangular groove is a positioning pressure sensing area, and the position (the position on the groove radius) matched by the rectangular boss and the rectangular groove can be enlarged or reduced according to the use of different trays; if the upper half of the two side walls of each rectangular groove is a positioning pressure sensing area, it can be ensured that the rectangular groove can cooperate with trays of more sizes, and it is more conducive to the machining of the rectangular groove and the installation of the thin film pressure sensor.

[0032] Beneficial effects

[0033] The clamp system based on pressure online monitoring can realize real-time online feedback of positioning accuracy and clamping strength. BRIEF DESCRIPTION OF DRAWINGS

[0034] Fig. 1An assembly view of a clamp system based on pressure online monitoring according to the present application;

[0035] Fig. 2 A cross-sectional view of the clamp system based on pressure online monitoring according to the present application in an unlocked state;

[0036] Fig. 3 A cross-sectional view of the clamp system based on pressure online monitoring according to the present application in a clamped state;

[0037] Fig. 4 A side view of the clamp system based on pressure online monitoring according to the present application in an unlocked state;

[0038] Wherein, 1 - tray, 2 - positioning pressure sensing area, 3 - draw pin, 4 - clamp housing, 5 - piston retainer, 6 - spring, 7 - steel ball, 8 - steel ball holder, 9 - clamping pressure sensing area, 10 - piston. DETAILED DESCRIPTION

[0039] The present application will be further described below in connection with specific embodiments. It should be understood that these embodiments are intended to illustrate the present application and not to limit the scope of the present application. Furthermore, it should be understood that after reading the content of the present application, those skilled in the art can make various modifications or changes to the present application, and these equivalent forms also fall within the scope of the appended claims of the present application.

[0040] Example 1

[0041] A clamp system based on pressure online monitoring, as shown in Figs. 1-4 , includes a tray 1, a draw pin 3, a clamp housing 4, a circumferential array of steel balls 7, a steel ball holder 8, a piston 10, a piston retainer 5, and a spring 6;

[0042] The draw pin 3 is coaxially connected with the tray 1 by bolts and enters the inside of the clamp housing 4 through the central through hole of the clamp housing 4; the draw pin 3 is provided with an inner concave arc-shaped rotary body structure and cooperates with the steel balls 7;

[0043] The tray 1 and the clamp shell 4 are positioned by four pairs of mutually matched rectangular bosses and rectangular grooves, the rectangular bosses are arranged on the surface of the tray 1 facing the clamp shell 4, and the rectangular grooves are arranged on the surface of the clamp shell 4 facing the tray 1; the height of the rectangular boss is half of the depth of the rectangular groove matched therewith; the four rectangular bosses are evenly arranged in a circumferential array, and the four rectangular grooves are distributed on the four sides of a cross shape, and the center of the cross shape is located on the central axis of the clamp shell 4; one end of the four rectangular bosses extends to the bolt, and the other end extends to the edge of the tray 1; one end of the four rectangular grooves extends to the central through hole of the clamp shell 4, and the other end extends to the edge of the clamp shell 4; the width of each rectangular groove is one tenth of the diameter of the clamp shell 4; when positioned, the area of the upper half of the two side walls of each rectangular groove is the positioning pressure sensing area 2; the positioning pressure sensing area 2 is formed by arranging a thin film pressure sensor in a rectangular mounting groove opened on the side wall of the rectangular groove, the thickness of the thin film pressure sensor is 1mm, the thin film pressure sensor is composed of a piezoelectric sensor unit with a thickness of 1mm, the thin film pressure sensor is attached to the groove bottom of the rectangular mounting groove, and the depth of the rectangular mounting groove is the same as the thickness of the thin film pressure sensor; the thin film pressure sensor can be a thin film pressure sensing sheet SA6464-22A-HP of TacSense Titanium Deep Technology (Shenzhen) Co., Ltd., and is not limited to this product, as long as the sensor size and measurement accuracy requirements are met;

[0044] The number of steel balls 7 is n and is distributed in a circumferential array, n is a positive integer greater than 1; the steel ball retainer 8 is evenly arranged with n through holes in the radial direction for fixing the positions of the n steel balls 7; the diameter of the through hole on the outer side surface of the steel ball retainer 8 is 0.2mm larger than the diameter of the steel ball 7, and the diameter of the through hole on the inner side surface of the steel ball retainer 8 is 0.2mm smaller than the diameter of the steel ball 7; the piston 10 is coaxially arranged with the clamp shell 4 and the steel ball retainer 8 and is installed between the clamp shell 4 and the steel ball retainer 8; the conical annular surface region of the piston 10 in contact with the steel ball 7 is the clamping pressure sensing area 9; the clamping pressure sensing area 9 is formed by arranging a thin film pressure sensor in an annular mounting groove opened on the conical annular surface, the thickness of the thin film pressure sensor is 1mm, the thin film pressure sensor is composed of a piezoelectric sensor unit with a thickness of 1mm, the thin film pressure sensor is attached to the groove bottom of the annular mounting groove, and the depth of the annular mounting groove is the same as the thickness of the thin film pressure sensor; the thin film pressure sensor can be a thin film pressure sensing sheet SA6464-22A-HP of TacSense Titanium Deep Technology (Shenzhen) Co., Ltd., and is not limited to this product, as long as the sensor size and measurement accuracy requirements are met;

[0045] The spring 6 is m in total and is arranged in a circumferential array between the piston 10 and the clamp shell 4, m is a positive integer greater than 1;

[0046] The piston blocking ring 5 is installed at the corresponding clamping groove of the contact surface between the clamp shell 4 and the piston 10;

[0047] When the pressure value of the positioning pressure sensing area 2 is below 0.5 MPa, the system prompts invalid positioning information; after receiving the invalid positioning warning, the technician measures and evaluates the sensor position in the clamp system and the corresponding structural size; if the size width of the rectangular groove at the corresponding position exceeds the set value of 0.2 mm, the clamp shell 4 of the clamp system is replaced; if the size width of the rectangular boss at the corresponding position is below the set value of 0.2 mm, the tray 1 of the clamp system is replaced; otherwise, the rectangular groove in the clamp system is matched with other rectangular bosses on the tray 1 by rotating the tray 1;

[0048] When the pressure value of the positioning pressure sensing area 2 is between 0.5-5 MPa, the system prompts valid positioning information, and the positioning of the clamp system is good at this time, without further operation of the technician;

[0049] When the pressure value of the positioning pressure sensing area 2 exceeds 5 MPa, the system prompts over-positioning information; after receiving the over-positioning warning, the technician measures and evaluates the sensor position in the clamp system and the corresponding structural size; if the size width of the rectangular groove at the corresponding position is below the set value of 0.2 mm, the clamp shell 4 of the clamp system is replaced; if the size width of the rectangular boss at the corresponding position is below the set value of 0.2 mm, the tray 1 of the clamp system is replaced; otherwise, the rectangular groove in the clamp system is matched with other rectangular bosses on the tray 1 by rotating the tray 1;

[0050] When the pressure value of the clamping pressure sensing area 9 is below 10 MPa, the system prompts insufficient clamping force information; after receiving the insufficient clamping force warning, the technician measures and evaluates the pull pin 3 in the clamp system and the steel ball 7 corresponding to the sensor position that sends the information; if the roundness runout value of the pull pin 3 and the steel ball 7 is above 0.05 mm, the pull pin 3 of the clamp system is replaced; if the roundness runout value of the steel ball 7 at the warning position is above 0.05 mm, the steel ball 7 is replaced; otherwise, the pull pin 3 is rotated by a certain angle by rotating the tray 1, and then inserted into the inside of the clamp shell 4 and clamped with the steel ball 7; after all the above operations are completed, before the next use of the clamp system, the steel ball 7 and the steel ball retainer 8 of the clamp system are uniformly blown off and lubricated;

[0051] When the pressure value of the clamping pressure sensing area 9 is between 10-300 MPa, the system prompts normal clamping information, and the clamping of the clamp system is good at this time, without further operation of the technician;

[0052] When the pressure value of the clamping pressure sensing area 9 exceeds 300 MPa, the system prompts the clamping force overload information; the technician measures and evaluates the pull stud 3 in the clamp system and the steel ball 7 corresponding to the sensor position sending the information after receiving the clamping force overload warning; if the roundness value of the surface of the pull stud 3 and the steel ball 7 exceeds 0.05 mm, replace the pull stud 3 of the clamp system; if the roundness value of the steel ball 7 at the warning position exceeds 0.05 mm, replace the steel ball 7; otherwise, rotate the tray 1 to drive the pull stud 3 to rotate by a certain angle, then insert it into the inside of the clamp shell 4 and clamp with the steel ball 7; after all the above operations are completed, before the next use of the clamp system, blow off the chips and apply lubricating oil to the steel ball 7 and the steel ball holder 8 of the clamp system.

[0053] The system performs local maximum value screening operation on the pressure measurement data of the clamping pressure sensor to determine the local pressure peak point of the clamping pressure sensor area 9; the local maximum value screening operation is: the system traverses each measurement unit of the clamping pressure sensor to feedback the measurement value, compares the value of each point with the values of its surrounding 24 measurement points, that is, expands a range of five measurement units in length and width with any measurement point as the center; if the measurement unit is at the edge of the sensor, the above measurement range is included as the object for comparison; through the above operation, the local pressure peak point of the pressure sensor area 9 is determined, and after the local pressure peak traversal calculation, the angle of the sector obtained by the center axis of the clamp system is calculated;

[0054] When the angle of the sector obtained by the center axis of the clamp system between any two adjacent pressure peak points of the clamping pressure sensing area 9 is between 45-75 degrees, the system prompts that the clamping is stable and no further action is required.

[0055] When the angle of the sector obtained by the center axis of the clamp system between any two adjacent pressure peak points of the clamping pressure sensing area 9 is less than 45 degrees or more than 75 degrees, the system prompts that the clamping is unstable; the technician measures and evaluates the pull stud 3 in the clamp system and the steel ball 7 corresponding to the sensor position sending the information after receiving the clamping force overload warning; if the roundness value of the surface of the pull stud 3 and the steel ball 7 exceeds 0.05 mm, replace the pull stud 3 of the clamp system; if the roundness value of the steel ball 7 at the warning position exceeds 0.05, replace the steel ball 7; otherwise, rotate the tray 1 to drive the pull stud 3 to rotate by a certain angle, then insert it into the inside of the clamp shell 4 and clamp with the steel ball 7; after all the above operations are completed, before the next use of the clamp system, blow off the chips and apply lubricating oil to the steel ball 7 and the steel ball holder 8 of the clamp system.

[0056] Through the above embodiment operation, the monitoring and early warning of the positioning accuracy, positioning stability, clamping accuracy and clamping stability of the clamp system in the processing site can be realized, so as to ensure the 0.001mm repeat positioning accuracy of the clamp system, realize the timely early warning of the dangerous conditions such as under-positioning, over-positioning and offset clamping, and improve the service life of the clamp system by 30%.

[0057] Embodiment 2

[0058] A clamp system based on pressure online monitoring, basically the same as embodiment 1, the difference is that the conical annular surface area of the piston in embodiment 2 is not provided with a ring-shaped installation groove, and a thin film pressure sensor is not laid.

[0059] Embodiment 3

[0060] A clamp system based on pressure online monitoring, basically the same as embodiment 1, the difference is that the rectangular recess on the clamp shell in embodiment 3 is not provided with a rectangular installation groove on the side wall, and a thin film pressure sensor is not laid.

Claims

1. A clamp system based on pressure online monitoring, comprising steel balls (7) and a piston (10); the number of steel balls (7) is n, n is a positive integer greater than 1, and the steel balls are arranged in a circumferential array; characterized in that, The conical annular surface region where the piston (10) contacts the steel ball (7) is a clamping pressure sensing region (9); The clamping pressure sensing region (9) is formed by laying a thin film pressure sensor in a ring-shaped mounting groove opened on the conical annular surface, the thin film pressure sensor is attached to the groove bottom, and the thickness of the thin film pressure sensor is the same as the depth of the ring-shaped mounting groove; the thickness of the thin film pressure sensor is 1mm, which is formed by a piezoelectric sensor unit with the same thickness of 1mm; It also includes a tray (1), a pull pin (3) and a clamp shell (4); the pull pin (3) is coaxially connected with the tray (1) through a bolt and enters the inside of the clamp shell (4) through the central through hole of the clamp shell (4); the tray (1) and the clamp shell (4) are positioned by two pairs of rectangular bosses and rectangular grooves matched with each other; The region where the side wall of each rectangular groove is attached to the rectangular boss during positioning is a positioning pressure sensing region; The positioning pressure sensing region is formed by laying a thin film pressure sensor in a rectangular mounting groove opened on the side wall of the rectangular groove, the thin film pressure sensor is attached to the groove bottom, and the thickness of the thin film pressure sensor is the same as the depth of the rectangular mounting groove; the thickness of the thin film pressure sensor is 1mm, which is formed by a piezoelectric sensor unit with the same thickness of 1mm; The system performs a local maximum value screening operation on the pressure measurement data of the clamping pressure sensor to determine the local pressure peak points of the clamping pressure sensing region (9); the local maximum value screening operation is as follows: the system traverses the measurement value fed back by each measurement unit of the clamping pressure sensor, compares the value of each point with the values of its surrounding 24 measurement points, i.e. expands a range of five measurement units in length and width with any measurement point as the center; if the measurement unit is at the edge of the sensor, the above-mentioned measurement range is included for comparison; through the above operation, the local pressure peak points of the clamping pressure sensing region (9) are determined, and after the local pressure peak traversal calculation, the angle of the sector obtained by the center axis of the clamp system is calculated; When the angle of the sector obtained by the center axis of the clamp system of any two adjacent pressure peak points of the clamping pressure sensing region (9) is between 45-75 degrees, the system prompts that the clamping is stable; When the angle of the sector obtained by the center axis of the clamp system of any two adjacent pressure peak points of the clamping pressure sensing region (9) is less than 45 degrees or more than 75 degrees, the system prompts that the clamping is unstable.

2. The clamp system based on pressure online monitoring according to claim 1, characterized in that, The pull pin (3) is provided with an inner concave arc-shaped rotary body structure, which cooperates with the circumferentially arrayed steel balls (7).

3. The clamp system based on pressure online monitoring according to claim 1, characterized in that, The steel ball holder (8) is arranged with n through holes evenly in the radial direction for fixing the positions of n steel balls (7); the diameter of the through hole in the outer side surface of the steel ball holder (8) is 0.2 mm larger than the diameter of the steel ball (7); the diameter of the through hole in the inner side surface of the steel ball holder (8) is 0.2 mm smaller than the diameter of the steel ball (7); the piston (10) is coaxially arranged between the clamp shell (4) and the steel ball holder (8) and is installed between the clamp shell (4) and the steel ball holder (8); The spring (6) is arranged in a circular array between the piston (10) and the clamp shell (4), and m is a positive integer greater than 1; The piston retainer (5) is installed at the corresponding clamping groove of the contact surface between the clamp shell (4) and the piston (10).

4. The clamp system based on pressure online monitoring according to claim 1, characterized in that, The rectangular boss is arranged on the surface of the tray (1) facing the clamp shell (4), and the rectangular groove is arranged on the surface of the clamp shell (4) facing the tray (1).

5. The clamp system based on pressure online monitoring according to claim 4, characterized in that, The rectangular boss and the rectangular groove are four pairs; the four rectangular bosses are evenly arranged in a circular array, and the four rectangular grooves are distributed on the four sides of the cross shape, and the center of the cross shape is located on the central axis of the clamp shell (4).

6. The clamp system based on pressure online monitoring according to claim 5, characterized in that, One end of the four rectangular bosses extends to the bolt, and the other end extends to the edge of the tray (1); one end of the four rectangular grooves extends to the central through hole of the clamp shell (4), and the other end extends to the edge of the clamp shell (4); the width of each rectangular groove is one tenth of the diameter of the clamp shell (4).

7. The clamp system based on pressure online monitoring according to claim 6, characterized in that, The height of the rectangular boss is half the depth of the rectangular groove matched therewith; the upper half of the two side walls of each rectangular groove is a positioning pressure sensing area.

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