CN117863422B - Automatic measurement control system for film thickness of casting machine - Google Patents

Abstract

The invention discloses an automatic measurement control system for film thickness of a casting machine, which comprises: the thickness measuring instrument is arranged on the casting machine and is used for measuring the thickness of the film; the bolt adjusting mechanism is arranged on the casting machine and is used for determining the position of the bolt and adjusting the bolt; the control unit is arranged on the casting machine and is used for controlling the working condition of the bolt adjusting mechanism according to the detected thickness data of the film so as to change the thickness of the film. According to the invention, the thickness of the film on the production line of the casting machine is measured, and the bolt adjusting mechanism is controlled by the control unit according to the detected thickness data of the film, so that the thickness of the produced film can meet the use requirement, the problems of low efficiency and poor stability of a manual control mode are effectively solved, the problems of high power consumption and low response speed of the mode of adjusting the thickness of the film by heating the bolt are avoided, the efficiency and qualification rate of film production are improved, and the quantity of waste materials is reduced.

Description

An automatic measurement and control system for film thickness of casting machine

Technical Field

The invention relates to the technical field of film thickness measurement and control, in particular to an automatic film thickness measurement and control system for a casting machine.

Background Art

The production process of plastic film produced by cast film machine is to heat and dissolve plastic particles, then transport them to the film head through the screw, and finally extrude them from the lip of the die head. The gap width in the lip is controlled by the tightening degree of the bolts. Each bolt controls the width of about 1 inch. According to the width of the film to be produced, several bolts are generally required to control the thickness of the entire width. Among them, the bolts are divided into electric heating bolts and manual bolts. The electric heating bolts heat the bolts through electric heating wires, change the expansion degree of the bolts, squeeze the lip, and finally change the lip opening, thereby changing the film thickness.

However, there are many disadvantages in using electric heating bolts to control the film thickness. For example, the heating of the bolts consumes a lot of electricity, which is high in energy consumption and increases the production cost of the enterprise. At the same time, the control of the bolts will also generate a lot of heat, which will also affect the temperature control of the membrane head itself. In addition, high temperature can easily cause human harm to the operator. Finally, the temperature rise and fall time is slow, which will lead to a long thickness control process and a high product scrap rate. Changing the film thickness by manually adjusting the bolts also has many inconveniences, because the manual bolt control method is that the worker uses a wrench to rotate and adjust the bolt's compression to change the film thickness, and the uncertainty caused by manual skill level and work attitude will also affect the film thickness, resulting in a large amount of waste and a low pass rate. At the same time, manual adjustment will greatly increase the workload of the workers, so this method has low work efficiency.

Summary of the invention

The technical problem to be solved by the present invention is that the film thickness control method in the prior art has the problems of high energy consumption, low working efficiency, poor stability and high scrap rate.

In order to solve the above technical problems, the present invention provides a film thickness automatic measurement and control system for a casting machine, comprising:

A thickness measuring instrument, arranged on the casting machine, and used to measure the thickness of the film;

A bolt adjustment mechanism is provided on the casting machine, and is used to determine the position of the bolt and adjust the bolt;

A control unit is arranged on the casting machine, and is used to control the working condition of the bolt adjustment mechanism according to the detected thickness data of the film to change the thickness of the film.

Furthermore, the bolt adjustment mechanism includes:

A positioning device for determining the position of the bolt;

Adjustment wrench, used to adjust the angle of the bolt;

A moving mechanism, used for driving the adjusting wrench to move to the position where the bolt is located, and putting the adjusting wrench on the bolt;

Wherein, the positioning device, the adjusting wrench and the moving mechanism are all electrically connected to the control unit.

Furthermore, the control unit comprises:

A collection module connected to the thickness measuring instrument, the collection module is used to collect the thickness data of the film detected by the thickness measuring instrument;

A processing module connected to the acquisition module, the processing module is used to set the working instructions of the adjustment wrench according to the detected thickness data of the film;

A control module is connected to the processing module, and the control module is used to control the adjustment wrench to work according to the work instruction.

Furthermore, the processing module is used to calculate the adjustment angle of the bolt according to the difference between the detected actual thickness of the film and the target thickness, and set the working instruction of the adjustment wrench according to the calculated adjustment angle of the bolt. The calculation formula of the adjustment angle of the bolt is:

A = (TT _S )*k,

Where A is the adjustment angle, T is the measured thickness, _TS is the target thickness, and k is the gain coefficient.

Furthermore, the acquisition module is used to obtain the adjustment angle ΔG of the bolt, and the control module is used to control the adjustment wrench;

The processing module is used to set the preset adjustment angle value G0, and the processing module is also used to set the first preset angle difference g1, the second preset angle difference g2, the third preset angle difference g3 and the fourth preset angle difference g4, and g1＜g2＜g3＜g4; the processing module is also used to set the first preset working condition matrix A1 (a1, b1), the second preset working condition matrix A2 (a2, b2), the third preset working condition matrix A3 (a3, b3) and the fourth preset working condition matrix A4 (a4, b4), wherein a1-a4 are the first to fourth preset rotation numbers, and a1＜a2＜a3＜a4, b1-b4 are the first to fourth preset rotation speeds, and b1＜b2＜b3＜b4;

According to the difference between the obtained adjustment angle △G of the bolt and the set adjustment angle preset value G0, a preset working condition matrix Ai is selected as the working condition of the adjustment wrench;

When △G-G0≤g1, the first preset working condition matrix A1 is selected as the working condition of the adjusting wrench;

When g1＜△G-G0≤g2, the second preset working condition matrix A2 is selected as the working condition of the adjusting wrench;

When g2＜△G-G0≤g3, the third preset working condition matrix A3 is selected as the working condition of the adjusting wrench;

When g3＜△G-G0≤g4, the fourth preset working condition matrix A4 is selected as the working condition of the adjusting wrench;

Among them, when the i-th preset working condition matrix Ai is selected as the working condition of the adjusting wrench, the control module controls the adjusting wrench to rotate the i-th preset number of rotations ai, and the control module will also control the adjusting wrench to work at the i-th preset rotation speed bi, i=1, 2, 3, 4.

Furthermore, the control module is also used to determine whether the bolt has reached the adjustment cycle after calculating the adjustment angle of the bolt. If the adjustment cycle has been reached, the working instruction of the adjustment wrench is set. If the adjustment cycle has not been reached, the working instruction of the adjustment wrench is not set. The bolt adjustment cycle calculation formula is:

W = L/V,

Wherein, W is the adjustment period, L is the distance from the film head to the thickness measuring instrument, and V is the speed of the casting machine production line.

Furthermore, the calculation formula for measuring the film thickness by the thickness measuring instrument is:

h = 1/λ * ln(I ₀ /I),

Wherein, h is the thickness of the film, I is the signal value of the film, _I0 is the signal value before passing through the film, and λ is the absorption coefficient of the film to X-rays.

Furthermore, the moving mechanism comprises:

An X slide table is arranged on the X axis of the tape casting machine;

An X-axis motor is arranged at one end of the X-slide, and the X-axis motor is used to adjust the bolt adjustment mechanism to move on the X-axis;

A Y slide, arranged on the X slide;

A Y-axis motor, arranged at one end of the Y slide, and used to adjust the bolt adjustment mechanism to move on the Y-axis;

A Z slide, arranged on the Y slide;

A Z-axis motor, disposed at one end of the Z slide, and used to adjust the bolt adjustment mechanism to move on the Z-axis;

The adjusting wrench is connected to the Z-axis motor via a plum coupling.

Compared with the prior art, the automatic measurement and control system for the film thickness of a casting machine according to the embodiment of the present invention has the following beneficial effects:

The present invention measures the thickness of the film on the cast film production line, and the control unit controls the bolt adjustment mechanism according to the detected film thickness data, so that the thickness of the produced film can meet the use requirements, effectively solving the problems of low efficiency and poor stability of the manual control method, and also avoiding the problems of high power consumption and slow response speed of the method of adjusting the film thickness by heating the bolts, thereby improving the efficiency and qualified rate of film production and reducing the amount of waste.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a block diagram of an automatic film thickness measurement control system for a casting machine according to an embodiment of the present invention;

2 is a block diagram of a bolt adjustment mechanism of an automatic film thickness measurement and control system for a casting machine according to an embodiment of the present invention;

3 is a block diagram of a control unit of an automatic film thickness measurement control system for a casting machine according to an embodiment of the present invention;

4 is a schematic structural diagram of a mobile mechanism of an automatic film thickness measurement control system for a casting machine according to an embodiment of the present invention;

In the figure, 1. X slide; 2. X-axis motor; 3. Y slide; 4. Y-axis motor; 5. Z slide; 6. Z-axis motor; 7. plum blossom coupling; 8. adjustment wrench.

DETAILED DESCRIPTION

The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

After the plastic film is produced, it is scanned by X-rays of the thickness measuring instrument to measure the single-width scanning profile of the film. Then, according to the arrangement position of the film head bolts, the full-width thickness is calculated into the partition thickness corresponding to the bolts. Then, based on the difference between the thickness of each partition and the target thickness, the adjustment angle of each bolt is calculated based on the difference, and it is adjusted by the bolt adjustment mechanism.

As shown in FIG. 1 , in an embodiment of the present application, a film thickness automatic measurement and control system for a casting machine is provided, comprising: a thickness measuring instrument, arranged on the casting machine, and used to measure the thickness of the film; a bolt adjustment mechanism, arranged on the casting machine, and used to determine the position of the bolt and adjust the bolt; a control unit, arranged on the casting machine, and used to control the working conditions of the bolt adjustment mechanism according to the detected film thickness data to change the thickness of the film.

Furthermore, the present invention measures the thickness of the film on the cast film production line, and the control unit controls the bolt adjustment mechanism according to the detected film thickness data, so that the thickness of the produced film can meet the use requirements, effectively solving the problems of low efficiency and poor stability of the manual control method, and also avoiding the problems of high power consumption and slow response speed of the method of adjusting the film thickness by heating the bolts, thereby improving the efficiency and qualified rate of film production and reducing the amount of waste.

As shown in Figure 2, in an embodiment of the present application, a film thickness automatic measurement and control system for a casting machine is provided, and the bolt adjustment mechanism includes: a positioning device for determining the position of the bolt; an adjusting wrench for adjusting the angle of the bolt; a moving mechanism for driving the adjusting wrench to move to the position of the bolt and setting the adjusting wrench on the bolt; wherein the positioning device, the adjusting wrench and the moving mechanism are all electrically connected to the control unit.

Specifically, the positioning device first determines the position of the bolt, then the moving mechanism drives the adjusting wrench to move to the position of the bolt, and the adjusting wrench is installed on the bolt. Finally, the adjusting wrench adjusts the angle of the current bolt to adjust the thickness of the film. After the thickness of the film is adjusted, the adjusting wrench is pulled out and moved to the next bolt to be adjusted, and the adjustment is continued according to the above steps.

As shown in Figure 3, in an embodiment of the present application, a cast film thickness automatic measurement and control system is provided, and the control unit includes: an acquisition module, connected to the thickness measuring instrument, and used to acquire the thickness data of the film detected by the thickness measuring instrument; a processing module, connected to the acquisition module, and used to set the working instructions of the adjustment wrench according to the detected thickness data of the film; a control module, connected to the processing module, and used to control the adjustment wrench to work according to the working instructions.

In an embodiment of the present application, a film thickness automatic measurement and control system for a casting machine is provided, wherein the processing module is used to calculate the adjustment angle of the bolt according to the difference between the measured thickness of the film and the target thickness, and to set the working instruction of the adjustment wrench according to the calculated adjustment angle of the bolt. The calculation formula of the adjustment angle of the bolt is:

A = (TT _S )*k,

Where A is the adjustment angle, T is the measured thickness, _TS is the target thickness, and k is the gain coefficient.

Specifically, a positive value of the adjustment angle A is in the clockwise direction, and a negative value is in the counterclockwise direction.

In an embodiment of the present application, a film thickness automatic measurement and control system for a casting machine is provided, wherein the acquisition module is used to obtain the adjustment angle △G of the bolt, and the control module is used to control the adjustment wrench;

The processing module is used to set the preset adjustment angle value G0, and the processing module is also used to set the first preset angle difference g1, the second preset angle difference g2, the third preset angle difference g3 and the fourth preset angle difference g4, and g1＜g2＜g3＜g4; the processing module is also used to set the first preset working condition matrix A1 (a1, b1), the second preset working condition matrix A2 (a2, b2), the third preset working condition matrix A3 (a3, b3) and the fourth preset working condition matrix A4 (a4, b4), wherein a1-a4 are the first to fourth preset rotation numbers, and a1＜a2＜a3＜a4, b1-b4 are the first to fourth preset rotation speeds, and b1＜b2＜b3＜b4;

According to the difference between the obtained adjustment angle △G of the bolt and the set adjustment angle preset value G0, a preset working condition matrix Ai is selected as the working condition of the adjustment wrench;

When △G-G0≤g1, the first preset working condition matrix A1 is selected as the working condition of the adjusting wrench;

When g1＜△G-G0≤g2, the second preset working condition matrix A2 is selected as the working condition of the adjusting wrench;

When g2＜△G-G0≤g3, the third preset working condition matrix A3 is selected as the working condition of the adjusting wrench;

When g3＜△G-G0≤g4, the fourth preset working condition matrix A4 is selected as the working condition of the adjusting wrench;

Among them, when the i-th preset working condition matrix Ai is selected as the working condition of the adjusting wrench, the control module controls the adjusting wrench to rotate the i-th preset number of rotations ai, and the control module will also control the adjusting wrench to work at the i-th preset rotation speed bi, i=1, 2, 3, 4.

Specifically, since the adjustment angle of the bolt needs to be automatically adjusted by the adjustment wrench, the number of rotations of the adjustment wrench will determine the angular position of the bolt, so as to determine the regulation of the film thickness. Therefore, the number of rotations of the adjustment wrench is selected according to the difference between the obtained adjustment angle of the bolt and the set preset value of the adjustment angle, so that the thickness of the produced film can meet the requirements, and the rotation speed of the adjustment wrench must also match the corresponding number of rotations, otherwise the bolt will be damaged if it is quickly tightened again when it has been tightened, thereby ensuring that the bolt adjustment mechanism can operate normally.

In an embodiment of the present application, a film thickness automatic measurement and control system for a casting machine is provided, wherein the control module is further used to determine whether the bolt has reached an adjustment period after calculating the adjustment angle of the bolt. If the adjustment period has been reached, the working instruction of the adjustment wrench is set; if the adjustment period has not been reached, the working instruction of the adjustment wrench is not set. The bolt adjustment period calculation formula is:

W = L/V,

Wherein, W is the adjustment period, L is the distance from the film head to the thickness measuring instrument, and V is the speed of the casting machine production line.

In an embodiment of the present application, a film thickness automatic measurement and control system for a casting machine is provided, and the calculation formula for measuring the film thickness by the thickness measuring instrument is:

h = 1/λ * ln(I ₀ /I),

Wherein, h is the thickness of the film, I is the signal value of the film, _I0 is the signal value before passing through the film, and λ is the absorption coefficient of the film to X-rays.

Specifically, the thickness measurement unit uses an X-ray tube to emit X-rays, which penetrate the film and are received by the ionization chamber sensor. When the film thickness changes, the X-rays that penetrate the film will change accordingly. The ionization chamber sensor transmits the signal to the control unit. The control unit collects the signal value I through the communication interface, and then calibrates using films of different thicknesses. The control unit calculates and fits the absorption coefficient λ under various thickness conditions. During measurement, the control unit calculates the thickness value h based on the signal value and the absorption coefficient.

As shown in Figure 4, in an embodiment of the present application, an automatic measurement and control system for the film thickness of a casting machine is provided, and the moving mechanism includes: an X slide 1, which is arranged on the X-axis of the casting machine; an X-axis motor 2, which is arranged at one end of the X slide 1, and the X-axis motor 2 is used to adjust the bolt adjustment mechanism to move on the X-axis; a Y slide 3, which is arranged on the X slide 1; a Y-axis motor 4, which is arranged at one end of the Y slide 3, and the Y-axis motor 4 is used to adjust the bolt adjustment mechanism to move on the Y-axis; a Z slide 5, which is arranged on the Y slide 3; a Z-axis motor 6, which is arranged at one end of the Z slide 5, and the Z-axis motor 6 is used to adjust the bolt adjustment mechanism to move on the Z-axis; the adjustment wrench 8 is connected to the Z-axis motor 6 through a plum blossom coupling 7.

Specifically, first determine the position of the bolt, drive the X-axis motor 2, move the adjustment wrench 8 to the position of the bolt to be adjusted, then the Y-axis motor 4 runs at a specified torque, and maintains after reaching the set torque value, the Z-axis motor 6 rotates at a specified torque, and stops when the set torque value is reached, then it means that the adjustment wrench 8 has been correctly inserted into the bolt, finally, drive the Z-axis motor 6 according to the given adjustment angle to rotate the adjustment wrench 8, adjust the angle of the current bolt to adjust the thickness of the film, after the thickness of the film is adjusted, the Y-axis is reset, and after the adjustment wrench 8 is pulled out, the adjustment wrench 8 is moved to the next bolt to be adjusted, and the adjustment is continued according to the above steps.

In summary, the embodiment of the present invention provides an automatic measurement and control system for the thickness of a film of a casting machine, which includes: a thickness meter is arranged on the casting machine, and the thickness meter is used to measure the thickness of the film; a bolt adjustment mechanism is arranged on the casting machine, and the bolt adjustment mechanism is used to determine the position of the bolt and adjust the bolt; a control unit is arranged on the casting machine, and the control unit is used to control the working conditions of the bolt adjustment mechanism according to the detected thickness data of the film to change the thickness of the film. The present invention measures the thickness of the film on the production line of the casting machine, and the control unit controls the bolt adjustment mechanism according to the detected film thickness data so that the thickness of the produced film can meet the use requirements, which effectively solves the problems of low efficiency and poor stability of the manual control method, and also avoids the problems of high power consumption and slow response speed of the heating bolt adjustment method of adjusting the film thickness, thereby improving the efficiency and qualified rate of film production and reducing the amount of waste.

Finally, it should be noted that it is obvious that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

The above is only an example of implementation of the present invention, but it cannot be used to limit the scope of the present invention. Any structural changes made according to the present invention, as long as they do not lose the essence of the present invention, should be regarded as falling within the scope of protection of the present invention and being restricted. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process and related instructions of the system described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus/device that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus/device.

So far, the technical solutions of the present invention have been described in conjunction with the further embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims (4)

1. A casting machine film thickness automatic measurement control system, characterized by comprising:

The thickness measuring instrument is arranged on the casting machine and is used for measuring the thickness of the film;

The bolt adjusting mechanism is arranged on the casting machine and is used for determining the position of the bolt and adjusting the bolt;

A control unit provided on the casting machine for controlling the working condition of the bolt adjusting mechanism according to the detected thickness data of the film to change the thickness of the film;

The bolt adjustment mechanism includes:

positioning means for determining the position of the bolt;

The adjusting spanner is used for adjusting the angle of the bolt;

The moving mechanism is used for driving the adjusting spanner to move to the position of the bolt and arranging the adjusting spanner on the bolt;

wherein the positioning device, the adjusting spanner and the moving mechanism are all electrically connected with the control unit;

the control unit includes:

the acquisition module is connected with the thickness measuring instrument and is used for acquiring thickness data of the thin film detected by the thickness measuring instrument;

the processing module is connected with the acquisition module and is used for setting the working instruction of the adjusting spanner according to the detected thickness data of the film;

The control module is connected with the processing module and is used for controlling the adjusting spanner to work according to the working instruction;

The processing module is used for calculating the adjusting angle of the bolt according to the difference value between the detected measured thickness and the target thickness of the film, and setting the working instruction of the adjusting spanner according to the calculated adjusting angle of the bolt, and the calculating formula of the adjusting angle of the bolt is as follows:

A = (T-T_S)*k，

Wherein A is an adjustment angle, T is an actual measurement thickness, T _S is a target thickness, and k is a gain coefficient;

The acquisition module is used for acquiring an adjustment angle delta G of the bolt, and the control module is used for controlling the adjustment wrench;

The processing module is used for setting an adjustment angle preset value G0, and is also used for setting a first preset angle difference value G1, a second preset angle difference value G2, a third preset angle difference value G3 and a fourth preset angle difference value G4, wherein G1 is more than G2 and less than G3 and less than G4; the processing module is further used for setting a first preset working condition matrix A1 (A1, b 1), a second preset working condition matrix A2 (A2, b 2), a third preset working condition matrix A3 (A3, b 3) and a fourth preset working condition matrix A4 (A4, b 4), wherein A1-A4 sequentially comprises first to fourth preset rotation turns, A1 is more than A2 and less than A3 and less than A4, b1-b4 sequentially comprises first to fourth preset rotation speeds, b1 is more than b2 and less than b3 and less than b4;

Selecting a preset working condition matrix Ai as the working condition of the adjusting spanner according to the obtained difference value between the adjusting angle delta G of the bolt and the preset value G0 of the set adjusting angle;

when delta G-G0 is less than or equal to G1, selecting the first preset working condition matrix A1 as the working condition of the adjusting spanner;

when G1 < [ delta ] G-G0 is less than or equal to G2, selecting the second preset working condition matrix A2 as the working condition of the adjusting spanner;

when G2 < [ delta ] G-G0 is less than or equal to G3, selecting the third preset working condition matrix A3 as the working condition of the adjusting spanner;

When G3 < [ delta ] G-G0 is less than or equal to G4, selecting the fourth preset working condition matrix A4 as the working condition of the adjusting spanner;

when the i-th preset working condition matrix Ai is selected as the working condition of the adjusting wrench, the control module controls the adjusting wrench to rotate the i-th preset rotation circle Ai, and the control module also controls the adjusting wrench to work at the i-th preset rotation speed bi, i=1, 2,3,4.

2. The automatic measuring and controlling system for film thickness of casting machine according to claim 1, wherein,

The control module is also used for judging whether the bolt reaches an adjustment period after calculating the adjustment angle of the bolt, if the adjustment period is reached, setting the working instruction of the adjustment wrench, and if the adjustment period is reached, not setting the working instruction of the adjustment wrench, wherein the calculation formula of the adjustment period of the bolt is as follows:

W = L/V，

Wherein W is an adjustment period, L is the distance from the film head of the film to the thickness measuring instrument, and V is the speed of the casting line of the casting machine.

3. The automatic measuring and controlling system for film thickness of casting machine according to claim 1, wherein,

The calculation formula for measuring the film thickness by the thickness measuring instrument is as follows:

h= 1/λ * ln(I₀/I)，

Wherein h is the thickness of the film, I is the signal value of the film, I ₀ is the signal value before the film is penetrated, and lambda is the absorption coefficient of the film to X-rays.

4. The automatic film thickness measuring and controlling system of a casting machine according to claim 1, wherein the moving mechanism comprises:

An X sliding table is arranged on the X axis of the casting machine;

the X-axis motor is arranged at one end of the X-sliding table and is used for adjusting the bolt adjusting mechanism to move on an X axis;

The Y sliding table is arranged on the X sliding table;

The Y-axis motor is arranged at one end of the Y sliding table and is used for adjusting the bolt adjusting mechanism to move on the Y axis;

the Z sliding table is arranged on the Y sliding table;

the Z-axis motor is arranged at one end of the Z-sliding table and is used for adjusting the bolt adjusting mechanism to move on the Z axis;

the adjusting spanner is connected to the Z-axis motor through a plum coupling.