A method for monitoring dynamic pressure and speed of ejector pin of injection molding machine

Abstract

The present invention discloses a method for monitoring the dynamic pressure and speed of an ejector pin of an injection molding machine. The method comprises the following steps: based on pressure data sets corresponding to multiple ejector retraction processes, a standard pressure curve corresponding to each pressure data set is obtained by using a cubic spline interpolation method; a pressure envelope curve is formed by using a first preset deviation and each standard pressure curve; a speed data set corresponding to multiple ejector strokes is obtained; and the ejector speed points in each speed data set are respectively fitted by using the cubic spline interpolation method to obtain a speed standard range. During the operation of the ejector, the real-time speed of the ejector pin and the real-time pressure value of the ejector oil circuit are obtained, and it is determined whether the real-time speed of the ejector pin and the real-time pressure value of the ejector oil circuit fall within the speed standard range and the pressure envelope curve, respectively. If the real-time speed of the ejector pin exceeds the speed standard range, or the real-time pressure value exceeds the pressure envelope curve, the power supply of the injection molding machine is cut off and an alarm message is sent, thereby realizing dynamic monitoring of the pressure and speed of the ejector pin of the injection molding machine at each position.

Description

Technical Field

[0001] The invention relates to the field of injection molding machines, and in particular to a method for monitoring the dynamic pressure and speed of an ejector pin of an injection molding machine. Background Art

[0002] In today's automated production environment, after the injection molding machine completes mold opening, the ejector pin moves forward to eject the product, allowing it to be removed manually or by a robot. However, this process presents several challenges. First, customers can be pinched when removing the product due to improper handling. Second, if the product fails to fully exit the mold or foreign matter enters the mold, the ejector pin can damage the mold when it retracts and closes the mold. Summary of the Invention

[0003] In order to detect the dynamic pressure and speed of the ejector pin of an injection molding machine in real time at each position, and promptly cut off the power supply of the injection molding machine and send an alarm message when an abnormality occurs, thereby reducing the risk of personal injury to the operator due to operational errors and preventing the problem of mold damage caused by foreign objects stuck in the mold cavity, the present invention proposes a method for monitoring the dynamic pressure and speed of the ejector pin of an injection molding machine, comprising:

[0004] During the ejector retraction process, the real-time position of the ejector and the corresponding real-time pressure value of the ejector oil circuit are obtained;

[0005] Get the time point t during the ejector stroke i The corresponding ejector pin position x(t i ), where t i is a discrete time point, i represents the time sequence number;

[0006] Based on pressure data sets corresponding to multiple ejector retraction processes, a standard pressure curve corresponding to each pressure data set is obtained using a cubic spline interpolation method; the pressure data set includes: the real-time position of the ejector and the corresponding real-time pressure value of the ejector oil circuit sampled at intervals; a pressure envelope curve is formed with each standard pressure curve using a first preset deviation; the pressure data set corresponds one-to-one to the ejector retraction process;

[0007] Acquire a plurality of speed data sets corresponding to ejector strokes; the speed data sets correspond to ejector strokes one by one; the speed data sets include: the ejector position x(t i ), and according to the ejector position x(t i ) The calculated ejector speed point v(x(t i ));

[0008] The ejector speed points in each speed data set are fitted using a cubic spline interpolation method to obtain a speed position curve corresponding to each speed data set; a speed envelope curve is formed using a second preset deviation and each speed position curve, and the upper and lower limits of the ejector speed are set using the speed envelope curve to obtain a speed standard range;

[0009] During the ejector operation, the real-time speed of the ejector and the real-time pressure value of the ejector oil circuit are obtained to determine whether they fall within the speed standard range and the pressure envelope curve respectively; if the real-time speed of the ejector exceeds the speed standard range, or the real-time pressure value exceeds the pressure envelope curve, the power supply of the injection molding machine is cut off and an alarm message is sent.

[0010] Furthermore, the monitoring method further includes:

[0011] During the operation of the injection molding machine, the pressure envelope curve is updated in real time based on the pressure data set corresponding to the previous n ejector retraction processes of the current time, and the speed standard range is updated based on the speed data set corresponding to the previous n ejector strokes of the current time.

[0012] Furthermore, the standard pressure curve indicates that the corresponding pressure data set is data obtained when the ejector is in a normal operating state.

[0013] Furthermore, obtaining a standard pressure curve corresponding to the pressure data set specifically includes:

[0014] Constructing a cubic polynomial that meets preset conditions for every two adjacent data points in the pressure data set; the abscissa of the data point is the real-time position of the ejector pin, and the ordinate is the real-time pressure value;

[0015] The expression of the cubic polynomial is:

[0016] S i (x(t))=a i +b i (x(t)-x(t i ))+c i (x(t)-x(t i )) 2 +d i (x(t)-x(t i )) 3 ;in:

[0017] a, b, c, and d are the polynomial coefficients, and x(t) represents the ejector position variable;

[0018] Solve the polynomial coefficients of each cubic polynomial based on preset conditions;

[0019] The interpolation segments corresponding to the cubic polynomials obtained by the combination are combined to obtain the standard pressure curve.

[0020] Furthermore, the preset conditions are:

[0021] The first-order derivatives of adjacent cubic polynomials are equal at the intersection points;

[0022] The second-order derivatives of adjacent cubic polynomials are equal at the intersection points;

[0023] In the interval [x(t i ), x(t i+1 )], S i (x) passes through the data point (x(t i ), y i ) and (x(t i+1 ), y i+1 ), where y i Indicates the real-time pressure value.

[0024] Furthermore, the first-order derivatives of the adjacent cubic polynomials are equal at the intersection point, and the corresponding formula expression is:

[0025]

[0026] The second-order derivatives of the adjacent cubic polynomials are equal at the intersection point, and the corresponding formula expression is:

[0027] S″ i (x(t i+1 ))=2c i +6d i (x(t i+1 )-x(t i ))=S″ i+1 (x(t i+1 ));

[0028] In the interval [x(t i ), x(t i+1 )], S i (x) passes through the data point (x(t i ), y i ) and (x(t i+1 ), y i+1 ), the corresponding formula expression is:

[0029] S i (x(t i ))=a i +b i (x(t i )-x(t i ))+c i (x(t i )-x(t i )) 2+d i (x(t i )-x(t i )) 3 =y i

[0030] S i (x(t i+1 ))=a i +b i (x(t i+1 )-x(t i ))+c i (x(t i+1 )-x(t i )) 2 +d i (x(t i+1 )-x(t i )) 3 =y i+1 .

[0031] Furthermore, the ejector speed point v(x(t i )) is calculated as:

[0032]

[0033] Furthermore, the function expression of the upper envelope curve in the pressure envelope curve is:

[0034] P up-envelope (x(t i ))=max(P1(x(t i )), P2(x(t i )), P3(x(t i ))..., P n (x(t i )))+e1;

[0035] The function expression of the lower envelope curve in the pressure envelope curve is:

[0036] P down-envelope (x(t i ))=min(P1(x(t i )), P2(x(t i )), P3(x(t i ))..., P n (x(t i )))-e1;

[0037] Where n represents the number of standard pressure curves, P j (x(t i)) represents the jth standard pressure curve, j=1..·n; e1 represents the first preset deviation.

[0038] Furthermore, the function expression of the upper envelope curve in the velocity envelope curve is:

[0039] V up (x(t i ))=max(V(x(t1)), V(x(t2)),..., V(x(t) n )))+e2;

[0040] The function expression of the lower envelope curve in the velocity envelope curve is:

[0041] V down (x(t i ))=min(V(x(t1)), V(x(t2)),..., V(x(t) n )))-e2;

[0042] Where, V(x(t i )) represents the i-th speed-position curve, i=1…n, n represents the number of speed-position curves, and e2 represents the second preset deviation.

[0043] Furthermore, the ejector stroke includes the ejection and retraction processes of the ejector.

[0044] Compared with the prior art, the present invention has at least the following beneficial effects:

[0045] (1) The present invention is based on a pressure data set corresponding to multiple ejector pin retraction processes, and uses a cubic spline interpolation method to obtain a standard pressure curve corresponding to each pressure data set; a pressure envelope curve is formed by a first preset deviation and each standard pressure curve; a speed data set corresponding to multiple ejector pin strokes is obtained; the ejector pin speed points in each speed data set are fitted using a cubic spline interpolation method to obtain a speed standard range; during the ejector pin operation process, the real-time speed of the ejector pin and the real-time pressure value of the ejector pin oil circuit are obtained, and it is determined whether the two fall within the speed standard range and the pressure envelope curve respectively; if the real-time speed of the ejector pin exceeds the speed standard range, or the real-time pressure value exceeds the pressure envelope curve, the power supply of the injection molding machine is cut off and an alarm message is sent, thereby realizing dynamic monitoring of the pressure and speed of the ejector pin at each position of the injection molding machine, reducing the risk of personal injury to the operator due to operational errors, and preventing the problem of damage to the mold due to foreign matter stuck in the mold cavity;

[0046] (2) During the operation of the injection molding machine, the present invention updates the pressure envelope curve in real time based on the pressure data set corresponding to the previous n ejector retraction processes of the current time, and updates the speed standard range based on the speed data set corresponding to the previous n ejector strokes of the current time, thereby achieving accurate early warning of the ejector operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flow chart of a method for monitoring the dynamic pressure and speed of an injection molding machine ejector pin;

[0048] Figure 2 Schematic diagram of the two-dimensional coordinates corresponding to the pressure data set. DETAILED DESCRIPTION

[0049] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0050] In order to detect the dynamic pressure and speed of the ejector pin of the injection molding machine at each position in real time, and to cut off the power supply of the injection molding machine and send an alarm message in time when an abnormality occurs, thereby reducing the risk of personal injury caused by operator error and preventing damage to the mold caused by foreign matter stuck in the mold cavity. Figure 1 As shown, the present invention proposes a method for monitoring the dynamic pressure and speed of an injection molding machine ejector pin, comprising:

[0051] During the ejector retraction process, the real-time position of the ejector and the corresponding real-time pressure value of the ejector oil circuit are obtained;

[0052] In this embodiment, a pressure sensor is installed on the ejector oil circuit to obtain a real-time pressure value.

[0053] Get the time point t during the ejector stroke i The corresponding ejector pin position x(t i ), where t i is a discrete time point, i represents a time sequence number; the ejector stroke includes the ejection and retraction processes of the ejector.

[0054] Based on the pressure data sets corresponding to multiple ejector pin retraction processes, the standard pressure curve corresponding to each pressure data set is obtained using the cubic spline interpolation method; Figure 2 As shown, the pressure data set includes: the real-time position of the ejector pin sampled at intervals (interval time is 2ms) and the corresponding real-time pressure value of the ejector oil circuit; a pressure envelope curve is formed by combining the first preset deviation with each standard pressure curve; the pressure data set corresponds one-to-one to the ejector pin retraction process;

[0055] The standard pressure curve indicates that the corresponding pressure data set is data obtained when the ejector is in normal operating state.

[0056] Obtain the standard pressure curve corresponding to the pressure data set, including:

[0057] Constructing a cubic polynomial that meets preset conditions for every two adjacent data points in the pressure data set; the abscissa of the data point is the real-time position of the ejector pin, and the ordinate is the real-time pressure value;

[0058] The expression of the cubic polynomial is:

[0059] S i (x(t))=a i +b i (x(t)-x(t i ))+c i (x(t)-x(t i )) 2 +d i (x(t)-x(t i )) 3 ;in:

[0060] a, b, c, and d are the polynomial coefficients, and x(t) represents the ejector position variable;

[0061] Solve the polynomial coefficients of each cubic polynomial based on preset conditions;

[0062] The interpolation segments corresponding to the solved cubic polynomials are combined to obtain the standard pressure curve.

[0063] The preset conditions are:

[0064] The first-order derivatives of adjacent cubic polynomials are equal at the intersection points;

[0065] The first-order derivatives of the adjacent cubic polynomials are equal at the intersection point, and the corresponding formula expression is:

[0066]

[0067] The second-order derivatives of adjacent cubic polynomials are equal at the intersection points;

[0068] The second-order derivatives of the adjacent cubic polynomials are equal at the intersection point, and the corresponding formula expression is:

[0069] S″ i (z(t i+1 ))=2c i +6d i (x(t i+1 )-x(t i ))=S″ i+1 (x(t i+1 ));

[0070] It should be noted that in order to make the curve smooth, it is necessary to ensure that the first-order derivatives of adjacent polynomials are equal at the intersection points. Similarly, it is also necessary to ensure that the second-order derivatives of adjacent polynomials are equal at the intersection points.

[0071] In the interval [x(t i ), x(t i+1 )], S i (x) passes through the data point (x(t i ), y i ) and (x(t i+1 ), y i+1 ), where y i Indicates the real-time pressure value.

[0072] In the interval [x(t i ), x(t i+1 )], S i (x) passes through the data point (x(t i ), y i ) and (x(t i+1 ), y i+1 ), the corresponding formula expression is:

[0073] S i (x(t i ))=a i +b i (x(t i )-x(t i ))+c i (x(t i )-x(t i )) 2 +d i (x(t i )-x(t i )) 3 =y i

[0074] S i (x(t i+1 ))=a i +b i (x(t i+1 )-x(t i ))+c i (x(t i+1 )-x(t i )) 2 +d i (x(t i+1 )-x(t i )) 3 =y i+1 .

[0075] By using the equations corresponding to the above pre-set conditions, a linear equation system containing all interval endpoint information can be constructed. For n intervals (two adjacent data points are one interval), there will be 4n unknowns (because each interval has four coefficients) and the same number of equations. These equations can be written in matrix form Ax=b, where: A is the coefficient matrix, x is the unknown vector (containing all a i , b i , c i , d i ), where b is the vector of constant terms on the right. Finally, solve for x using standard linear equation-solving techniques (such as Gaussian elimination or LU decomposition) to obtain the coefficients of each cubic polynomial.

[0076] The function expression of the upper envelope curve in the pressure envelope curve is:

[0077] P up-envelope (x(t i ))=max(P1(x(t i )), P2(x(t i )), P3(x(t i ))..., P n (x(t i )))+e1;

[0078] The function expression of the lower envelope curve in the pressure envelope curve is:

[0079] P down-envelope (x(t i ))=min(P1(x(t i )), P2(x(t i )), P3(x(t i ))..., P n (x(t i )))-e1;

[0080] Where n represents the number of standard pressure curves, P j (x(t i )) represents the jth standard pressure curve, j=1…n; e1 represents the first preset deviation.

[0081] Acquire a plurality of speed data sets corresponding to ejector strokes; the speed data sets correspond to ejector strokes one by one; the speed data sets include: the ejector position x(t i ), and according to the ejector position x(t i ) The calculated ejector speed point v(x(t i ));

[0082] It should be noted that, in this embodiment, the velocity envelope curve is formed or updated, and the velocity data sets used are all data obtained when the ejector is in normal operating state.

[0083] The ejector speed point v(x(t i )) is calculated as:

[0084]

[0085] Using cubic spline interpolation to fit the ejector speed points in each speed data set, a speed position curve corresponding to each speed data set is obtained; a speed envelope curve is formed by combining a second preset deviation with each speed position curve, and upper and lower limits of the ejector speed are set using the speed envelope curve to obtain a speed standard range; the speed data sets correspond to the speed position curves one-to-one;

[0086] It should be noted that, in this embodiment, the method for obtaining the velocity position curve is the same as that for obtaining the standard pressure curve, and both are obtained by fitting the cubic spline interpolation method. In simple terms, it includes:

[0087] 1. For each adjacent data point in the velocity data set:

[0088] (x(t i ), v(x(t i ))) and (x(t i+1 ), v(x(t i+1 ))), both connect the two points by setting a cubic polynomial; the formula of the cubic polynomial is:

[0089] S i (x(t))=a i +b i (x(t)-x(t i ))+c i (x(t)-x(t i )) 2 +d i (x(t)-x(t i )) 3 ;

[0090] 2. Within each interpolation segment, the cubic polynomial S i (x(t)) should satisfy the following conditions:

[0091] S i (x(t i ))=v(x(t i ));

[0092] S i (x(t i+1 ))=v(x(ti+1 ));

[0093] S′ i (x(t i ))=S′ i-1 (x(t i-1 )); (the first-order derivative is continuous at the endpoints);

[0094] S″ i (x(t i ))=S″ i-1 (x(t i-1 )); (the second-order derivative is continuous at the endpoints);

[0095] A linear equation system is constructed based on these conditions, and the polynomial coefficients of each cubic polynomial are obtained by solving the equation system. The interpolation segments corresponding to each cubic polynomial obtained by combining the solved interpolation segments are used to obtain the velocity position curve V(x(t i )).

[0096] The function expression of the upper envelope curve in the velocity envelope curve is:

[0097] V up (x(t i ))=max(V(x(t1)), V(x(t2)),..., V(x(t) n )))+e2;

[0098] The function expression of the lower envelope curve in the velocity envelope curve is:

[0099] V down (x(t i ))=min(V(x(t1)), V(x(t2)),..., V(x(t) n )))-e2;

[0100] Where, V(x(t i )) represents the i-th speed-position curve, i=1…n, n represents the number of speed-position curves, and e2 represents the second preset deviation.

[0101] It should be noted that, in the present invention, the upper and lower limits of the ejector speed are the maximum and minimum values ​​of the speed envelope curve, respectively.

[0102] During the ejector operation, the real-time speed of the ejector and the real-time pressure value of the ejector oil circuit are obtained to determine whether they fall within the speed standard range and the pressure envelope curve respectively; if the real-time speed of the ejector exceeds the speed standard range, or the real-time pressure value exceeds the pressure envelope curve, the power supply of the injection molding machine is cut off and an alarm message is sent.

[0103] The monitoring method further comprises:

[0104] During the operation of the injection molding machine, the pressure envelope curve is updated in real time based on the pressure data set corresponding to the previous n ejector retraction processes of the current time, and the speed standard range is updated based on the speed data set corresponding to the previous n ejector strokes of the current time.

[0105] The present invention is based on pressure data sets corresponding to multiple ejector retraction processes, and uses a cubic spline interpolation method to obtain a standard pressure curve corresponding to each pressure data set; forms a pressure envelope curve through a first preset deviation and each standard pressure curve; obtains a speed data set corresponding to multiple ejector strokes; uses the cubic spline interpolation method to fit the ejector speed points in each speed data set respectively to obtain a speed standard range; during the ejector operation process, obtains the real-time speed of the ejector and the real-time pressure value of the ejector oil circuit, and determines whether the two fall within the speed standard range and the pressure envelope curve respectively; if the real-time speed of the ejector exceeds the speed standard range, or the real-time pressure value exceeds the pressure envelope curve, the power supply of the injection molding machine is cut off and an alarm message is sent, which realizes dynamic monitoring of the pressure and speed of the ejector at each position of the injection molding machine, reduces the risk of personal injury to the operator due to operational errors, and prevents the problem of mold damage caused by foreign matter stuck in the mold cavity.

[0106] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0107] In addition, in the present invention, descriptions such as "first," "second," and "one" are for descriptive purposes only and should not be understood to indicate or imply their relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0108] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0109] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A method for monitoring the dynamic pressure and speed of an injection molding machine ejector pin, characterized in that: include: During the ejector retraction process, the real-time position of the ejector and the corresponding real-time pressure value of the ejector oil circuit are obtained; Get the time point in the ejector stroke Corresponding ejector pin position ,in, is a discrete time point, Indicates the time sequence number; Based on pressure data sets corresponding to multiple ejector retraction processes, a standard pressure curve corresponding to each pressure data set is obtained using a cubic spline interpolation method; the pressure data set includes: the real-time position of the ejector and the corresponding real-time pressure value of the ejector oil circuit sampled at intervals; a pressure envelope curve is formed with each standard pressure curve using a first preset deviation; the pressure data set corresponds one-to-one to the ejector retraction process; Acquire a plurality of speed data sets corresponding to ejector strokes; the speed data sets correspond one to one with the ejector strokes; the speed data sets include: the ejector positions acquired in the corresponding ejector strokes , and according to the ejector pin position Calculated ejector speed point ; The ejector speed points in each speed data set are fitted using a cubic spline interpolation method to obtain a speed position curve corresponding to each speed data set; a speed envelope curve is formed using a second preset deviation and each speed position curve, and the upper and lower limits of the ejector speed are set using the speed envelope curve to obtain a speed standard range; During the ejector operation, the real-time speed of the ejector and the real-time pressure value of the ejector oil circuit are obtained to determine whether they fall within the speed standard range and the pressure envelope curve respectively; if the real-time speed of the ejector exceeds the speed standard range, or the real-time pressure value exceeds the pressure envelope curve, the power supply of the injection molding machine is cut off and an alarm message is sent.

2. The method for monitoring the dynamic pressure and speed of an injection molding machine ejector pin according to claim 1, wherein: The monitoring method further comprises: During the operation of the injection molding machine, the pressure envelope curve is updated in real time based on the pressure data set corresponding to the previous n ejector retraction processes of the current time, and the speed standard range is updated based on the speed data set corresponding to the previous n ejector strokes of the current time.

3. The method for monitoring the dynamic pressure and speed of an injection molding machine ejector pin according to claim 1, wherein: The standard pressure curve indicates that the corresponding pressure data set is data obtained when the ejector is in normal operating state.

4. The method for monitoring the dynamic pressure and speed of an injection molding machine ejector pin according to claim 3, wherein: Obtain the standard pressure curve corresponding to the pressure data set, including: Constructing a cubic polynomial that meets preset conditions for every two adjacent data points in the pressure data set; the abscissa of the data point is the real-time position of the ejector pin, and the ordinate is the real-time pressure value; The expression of the cubic polynomial is: ;in: are the polynomial coefficients, Indicates the ejector pin position variable; Solve the polynomial coefficients of each cubic polynomial based on preset conditions; The interpolation segments corresponding to the solved cubic polynomials are combined to obtain the standard pressure curve.

5. The method for monitoring the dynamic pressure and speed of an injection molding machine ejector pin according to claim 4, characterized in that: The preset conditions are: The first-order derivatives of adjacent cubic polynomials are equal at the intersection points; The second-order derivatives of adjacent cubic polynomials are equal at the intersection points; In the interval Inside, Passing data points and ;in, Indicates the real-time pressure value.

6. The method for monitoring the dynamic pressure and speed of an injection molding machine ejector pin according to claim 5, characterized in that: The first-order derivatives of the adjacent cubic polynomials are equal at the intersection point, and the corresponding formula expression is: ； The second-order derivatives of the adjacent cubic polynomials are equal at the intersection point, and the corresponding formula expression is: ； In the interval Inside, Passing data points and , the corresponding formula expression is: 。 7. The method for monitoring the dynamic pressure and speed of an injection molding machine ejector pin according to claim 6, wherein: The ejector speed point The calculation formula is: 。 8. The method for monitoring the dynamic pressure and speed of an injection molding machine ejector pin according to claim 7, characterized in that: The function expression of the upper envelope curve in the pressure envelope curve is: ； The function expression of the lower envelope curve in the pressure envelope curve is: ； Where n represents the number of standard pressure curves, represents the jth standard pressure curve, j=1…n; Indicates the first preset deviation.

9. The method for monitoring the dynamic pressure and speed of the ejector pin of an injection molding machine according to claim 8, characterized in that: The function expression of the upper envelope curve in the velocity envelope curve is: ； The function expression of the lower envelope curve in the velocity envelope curve is: ； Where, represents the i-th speed position curve, i=1…n, n represents the number of speed position curves, Indicates the second preset deviation.

10. The method for monitoring the dynamic pressure and speed of an injection molding machine ejector pin according to claim 1, characterized in that: The ejector stroke includes the ejection and retraction processes of the ejector.

Images