Double-injection-rod structure of die-casting die

Abstract

The invention relates to a double-injection-rod structure of a die-casting die, and belongs to the technical field of die-casting equipment, the double-injection-rod structure comprises a control module and two injection assemblies, each injection assembly comprises an injection rod, an injection channel, a punch and a detection module, one end of the injection rod is slidably arranged in the injection channel, the other end of the injection rod is connected with the punch, and the detection module is connected with the control module. The punch is used for driving the injection rod to press molten metal into a cavity, the detection module comprises a plurality of pressure sensors, the detection module is electrically connected with the control module, the pressure sensors are arranged at the contact part of the side surface of the injection rod and an injection channel, and the pressure sensors upload pressure data to the control module; the control module is used for respectively numbering a plurality of pressure sensors in the two injection rods, judging the change trend of each group of data along with time, and giving an alarm when the change trend of one group of data exceeds a threshold range; the service condition of the injection rod can be detected in time.

Description

Technical Field

[0001] The invention belongs to the technical field of die-casting equipment, and in particular relates to a double-shot rod structure of a die-casting mold. Background Art

[0002] Die casting is a casting process in which molten metal is injected into a barrel, and then the punch is pushed by the die-casting machine's injection rod to fill the molten metal into the mold cavity at high speed and high pressure.

[0003] A general die-casting machine has a single-shot structure, which has the following problems: the injection cylinder of the single-shot structure has only one injection speed and injection pressure during injection, resulting in a small pressure range that can be adjusted by the single-shot die-casting machine. At the same time, since the molten metal cools quickly in the mold, when the cavity corresponding to the product is large, the injection molding time is too long. When the molten metal fills the mold, the molten metal is in a solid-liquid mixed state in the mold, and the mechanical properties are poor. For this reason, Chinese patent CN113084120A discloses a double-shot rod structure of a die-casting mold, including a fixed mold, which is arranged on a fixed mold plate of a die-casting machine, and the fixed mold is provided with two symmetrically distributed melting cup mounting ports, each of which is provided with a melting cup, and the core of the fixed mold is provided with a casting system inner cavity corresponding to the two melting cups, and an injection structure is arranged behind the fixed mold, and the injection structure includes two injection rods, and the front of the two injection rods The two ends are respectively connected with punches, and the punches on the two shot rods are respectively slidably matched in the two melting cups, the rear ends of the two shot rods are connected to the double shot rod connecting seat, and the rear end of the double shot rod connecting seat is connected to the die-casting machine shot cylinder piston; by setting two shot rods, the problem of too long aluminum liquid filling path and poor molding quality in the die-casting process is improved, the shot time is reduced, the production efficiency is improved, and a new method is provided for die-casting super-large parts; in the above structure, the shot rod will be subjected to greater pressure and temperature when injecting molten metal into the cavity, and the shot rod is likely to be deformed and damaged under long-term use, and the above scheme does not detect the deformation of the shot rod, which is likely to cause the shot rod to continue to be used in a damaged state, causing damage to the die-casting machine and affecting the injection of the molten metal, thereby affecting the quality of the die-casting product. Therefore, a double shot rod structure of a die-casting mold that can detect the use of the shot rod in time is needed. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a double injection rod structure of a die-casting mold, which has the characteristic of being able to timely detect the use of the injection rod.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A double-shot rod structure of a die-casting mold, comprising a control module and two shot assemblies, both of which comprise a shot rod, a shot path, a punch and a detection module, one end of the shot rod being slidably disposed in the shot path, the other end of the shot rod being connected to the punch, the punch being used to drive the shot rod to press molten metal into a cavity, the detection module comprising a plurality of pressure sensors, the detection module being electrically connected to the control module, a plurality of the pressure sensors being disposed at a contact portion between a side surface of the shot rod and the shot path, a plurality of the pressure sensors being disposed in a ring array, and a plurality of the pressure sensors being disposed to detect the pressure they are subjected to in real time and upload the pressure data to the control module; The control module assigns numbers to several pressure sensors in the two injection rods respectively. After receiving pressure data each time, the control module groups the pressure data from the same number into a group in chronological order. The control module determines the change trend of each group of data over time, and the control module issues an alarm when the change trend of one group of data exceeds a threshold range.

[0006] As a preferred technical solution of the present invention, the control module assigns numbers x to the two injection rods respectively, and assigns numbers n to the pressure sensors in the two injection rods respectively. The control module is pre-input with a trend threshold range [-K1, K1]. Each time the control module receives the pressure data Pxn of a certain injection rod, it calculates the change trend kxn relative to the last uploaded Pxn. The control module determines whether the change trend kxn of each group of pressure data over time exceeds [-K1, K1], and issues an alarm when the judgment result is yes.

[0007] As a preferred technical solution of the present invention, the control module is respectively input with the working condition coefficients Ax of the two injection rods. Each time the control module receives the pressure data Pxn of a certain injection rod, it calculates the change trend kxn relative to the last uploaded Pxn. The control module determines whether the change trend kxn of each set of pressure data over time exceeds [-K1×(1+Ax), K1×(1+Ax)], and issues an alarm when the judgment result is yes.

[0008] As a preferred technical solution of the present invention, each time the control module receives the pressure data Pxn, it groups the pressure data Pxn from the pressure sensors with the same number into a group in chronological order, and calculates the pressure mean Pjxn from the most recently uploaded m data in each group of data. The control module determines whether the variance of several pressure means Pjxn from the injection rods with the same number is greater than a pre-input variance threshold, and issues an alarm when the judgment result is yes.

[0009] As a preferred technical solution of the present invention, the control module is used to count the number of times z that the injection rod executes injection. Each time the control module receives the pressure data Pxn of a certain injection rod, it calculates the change trend kxn relative to the last uploaded Pxn. The control module determines whether the change trend kxn of each group of pressure data over time exceeds [-K1×(1+Ax)×(1+A2), K1×(1+A1)×(1+A2)], and issues an alarm when the judgment result is yes; wherein A2=z / z0×d, 0≤A2≤1.

[0010] As a preferred technical solution of the present invention, the control module is pre-input with a difference threshold C1, the setting positions of several pressure sensors in the two injection assemblies relative to the injection rod axis are the same, the control module assigns the same number to the pressure sensors in the two injection rods with the same orientation relative to the injection rod axis, and each time the control module receives the pressure data Pxn of the two injection rods, it calculates the change trend kxn relative to the last uploaded Pxn, and determines whether the absolute value C of the difference between the two kxn data with the same n exceeds C1, and the control module issues an alarm when the judgment result is yes.

[0011] As a preferred technical solution of the present invention, it also includes a control panel, and the control panel is used to input the values ​​of K1, K2, C1 and C2.

[0012] As a preferred technical solution of the present invention, it also includes an alarm, which is electrically connected to the control module, and the control module sends out an alarm through the alarm.

[0013] The beneficial effects of the present invention are: (1) By setting a control module and a plurality of pressure sensors that upload their own pressure data to the control module, and making the control module determine whether the change rate of the pressure data uploaded successively by the plurality of pressure sensors is higher than a threshold value, an alarm is issued when the pressure at a certain part of the injection rod increases or decreases significantly in a short period of time, indicating that the injection rod is deforming, thereby completing the timely detection of the use of the injection rod; (2) By inputting the working condition coefficient of a certain injection component in advance and making the control module judge whether the pressure value change trend kxn is too large or too small according to the range [-K1×(1+Ax),K1×(1+Ax)], the judgment standard is relaxed when the wear rate of the injection rod by the molten metal is large during normal use, and the judgment standard is tightened when the wear rate of the injection rod by the molten metal is small during normal use, which further ensures the timely detection of the use of the injection rod, and takes into account both production efficiency and timely detection of the use of the injection rod; (3) By enabling the control module to group the data from the same pressure sensor and calculate the mean, and to determine whether the mean variance of several data groups in the same injection rod exceeds a threshold, the pressure difference of several parts of the injection rod can be detected when the deformation of the injection rod is relatively slow, thereby detecting the deformation of the injection rod as early as possible, and further improving the detection effect; (4) By making the control module count the number of times z that the shot rod executes the shot, and making the control module judge whether the pressure value change trend kxn is too large or too small according to the range [-K1×(1+Ax)×(1+A2),K1×(1+A1)×(1+A2)], the judgment standard is relaxed when the normal wear degree of the shot rod is large, and the judgment standard is tightened when the normal wear degree of the shot rod caused by the molten metal is small, thereby further ensuring the timely detection of the use of the shot rod, and taking into account both production efficiency and timely detection of the use of the shot rod; (5) By making the control module compare the trend difference of the pressure data uploaded by the injection sensors at the same position of the two injection rods to see whether it is greater than a threshold value, it is further determined whether the pressures at the same position of the two injection rods are consistent. When at least one of the injection rods undergoes a relatively obvious deformation, resulting in inconsistent pressures at the same position, the deformation is detected, further ensuring timely detection of the usage conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the injection assembly of the present invention; Figure 3 Schematic diagram of radial section of the injection rod of the present invention; Figure 4 is a control loop block diagram of the present invention; Description of main component symbols: In the figure: 1. Cavity; 2. Injection assembly; 21. Injection rod; 22. Injection channel; 3. Pressure sensor; 4. Control module. DETAILED DESCRIPTION

[0016] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0017] See also Figure 1-4A double-shot rod structure of a die-casting mold includes two shot assemblies 2, each of which includes a shot rod 21, a shot channel 22, and a punch. One end of the shot rod 21 is slidably disposed in the shot channel 22, and the other end of the shot rod 21 is connected to the punch. The punch is used to drive the shot rod 21 to press the molten metal into the cavity 1; Specifically, the two injection assemblies 2 are connected to the mold cavity 1 through the injection channel 22. One end of the injection channel 22 is connected to the mold cavity 1. The other end of the injection channel 22 is slidably provided with an injection rod 21. When in use, the molten metal is injected into the injection channel 22, and the punch drives the injection rod 21 to move along the injection channel 22 toward the mold cavity 1, thereby completing the pressing of the molten metal into the mold cavity 1. In the above scheme, the injection rod 21 will be subjected to greater pressure and temperature when injecting the molten metal into the cavity 1. The injection rod 21 is likely to be damaged by deformation or the like under long-term use. However, the above scheme does not detect the deformation of the injection rod 21, which may cause the injection rod 21 to continue to be used in a damaged state, causing damage to the die-casting machine and affecting the injection of the molten metal, thereby affecting the quality of the die-casting product. In order to timely detect the use of the injection rod 21, a control module 4 is also included. The two injection assemblies 2 respectively include a detection module. The detection module includes a plurality of pressure sensors 3. The detection module is electrically connected to the control module 4. The plurality of pressure sensors 3 are arranged at the contact portion between the side surface of the injection rod 21 and the injection channel 22. The plurality of pressure sensors 3 are arranged in a ring array. The plurality of pressure sensors 3 are arranged to detect the pressure they are subjected to in real time and upload the pressure data to the control module 4. Specifically, since one end of the injection rod 21 is slidably disposed in the injection path 22, the portion of the injection rod 21 disposed in the injection path 22 is defined as an inner section, and a plurality of pressure sensors 3 are disposed in an annular array on the inner section surface of the injection rod 21, and the projection positions of the plurality of pressure sensors 3 on the axis of the injection rod 21 coincide with each other. At this time, the plurality of pressure sensors 3 can detect the extrusion force between the portion of the injection rod 21 where they are located and the injection path 22; When the injection rod 21 is in use, it slides in the injection path 22. When the injection rod 21 is in a normal state and its shape has not changed, the pressures exerted by the inner sections of the injection rod 21 on the inner wall of the injection path 22 are roughly equal. At this time, the pressure data uploaded by the pressure sensors 3 are roughly equal. When the injection rod 21 has an abnormal structure, such as bending or twisting, some of the inner sections of the injection rod 21 are squeezed against the inner wall of the injection path 22, and some are away from the inner wall of the injection path 22. The pressures exerted by the inner sections of the injection rod 21 on the injection path 22 are unequal. At the same time, since the injection rod 21 is usually made of a metal material with high hardness and strength, the injection rod 21 deforms slowly. When a threshold value is set and fixed, and the pressure at a certain location is judged to be greater than or less than the threshold value, and then the deformation is judged to have caused a difference in pressure at various locations, when it is judged that the pressure at various locations has obvious deviations, the injection rod 21 has undergone a relatively obvious deformation, and there is a probability that the die-casting machine has been damaged. Therefore, it is necessary to timely detect the pressure changes at various locations caused by the deformation. For this purpose, the control module 4 assigns numbers to several pressure sensors 3 in the two injection rods 21, and the control module 4 groups the pressure data from the same number according to the chronological order each time it receives the pressure data. The control module 4 judges the change trend of each group of data over time, and the control module 4 issues an alarm when the change trend of one group of data exceeds the threshold range; Specifically, the control module 4 is pre-input with the value of K1, K1>0, the control module 4 assigns numbers x to the two shot rods 21, the control module 4 assigns numbers n to the pressure sensors 3 in the two shot rods 21, the control module 4 is pre-input with the trend threshold range [-K1, K1], the control module 4 calculates the change trend kxn relative to the last uploaded Pxn each time after receiving the pressure data Pxn of a shot rod 21, the control module 4 determines whether the change trend kxn of each group of pressure data over time exceeds [-K1, K1], and issues an alarm when the judgment result is yes; Wherein, kxn=(Pxnt1-Pxnt2) / (t1-t2), x is the number of the injection rod 21, x=1 or 2, n is the number of the pressure sensor 3 corresponding to the pressure data, in this embodiment, there are 8 pressure sensors 3 in each injection rod 21, then n=1, 2, ..., 8, t1 and t2 are the current uploaded pressure data, and the time point of the last upload, the number of seconds relative to the standard time point, t1>t2, and the value of t1-t2 is the time interval for the pressure sensor 3 to upload the pressure data. In this embodiment, since the pressure sensor 3 uploads the pressure data once per second, t1-t2=1, at this time, Pxnt1 and Pxnt2 are the pressure data uploaded successively by the pressure sensor 3 with the same number in the same injection rod 21, and kxn is the rate of change of the pressure in the vicinity of the pressure sensor 3 with the same number in the same injection rod 21 over time; When the absolute value of kxn calculated from the pressure data uploaded by a certain pressure sensor 3 is large, exceeding the value of K1 or less than the value of -K1, it means that the pressure at this part of the injection rod 21 has a large tendency to increase or decrease in a short period of time. At this time, there is a high probability that the injection rod 21 is deforming and requires inspection and intervention by the operator. At this time, the control module 4 sends an alarm signal to complete the detection of the use of the injection rod 21; When the absolute value of kxn calculated from the pressure data uploaded by a certain pressure sensor 3 is small and close to 0, it means that the pressure at this part of the injection rod 21 has no obvious tendency to increase or decrease in a short time, which means that the deformation of the injection rod 21 is not obvious, and no operator inspection and intervention is required; By setting up a control module 4 and a plurality of pressure sensors 3 that upload their own pressure data to the control module 4, and making the control module 4 determine whether the rate of change of the pressure data successively uploaded by the plurality of pressure sensors 3 is higher than a threshold value, when the pressure at a certain part of the injection rod 21 tends to increase or decrease significantly in a short period of time, an alarm is issued indicating that the injection rod 21 is deforming, thereby completing the timely detection of the use of the injection rod 21.

[0018] In some usage scenarios, two molten metal raw materials with slightly different compositions need to be mixed in the mold cavity 1, so as to improve the mechanical properties of the joint of the two molten metals, or to make the mechanical properties of the two parts of the die-cast metal part different. At this time, the molten metal compositions of the two shot assemblies 2 are different, and the reaction forces exerted by the molten metal on the shot rod 21 are different. Since die casting is usually used for long-term mass production, the slight difference in the molten metal composition of the two shot assemblies 2 will cause the two shot rods 21 to be subjected to different forces for a long time, and the wear speeds are different during normal use. The shot rod 21 with greater wear will have different forces. The pressure data uploaded by the pressure sensor 3 has a greater probability of detecting that the pressure data change trend is too large when the injection rod 21 is in normal use, resulting in a false alarm and affecting production efficiency. To avoid such a situation, the control module 4 inputs the working condition coefficient Ax of the two injection rods 21 respectively. Each time the control module 4 receives the pressure data Pxn of a certain injection rod 21, it calculates the change trend kxn relative to the last uploaded Pxn. The control module 4 determines whether the change trend kxn of each group of pressure data over time exceeds [-K1×(1+Ax), K1×(1+Ax)], and issues an alarm when the judgment result is yes; Specifically, the working condition coefficient Ax of the shot rod 21 is obtained by the operator before the start of a batch of production by calculating the loss rate of the molten metal raw material in the shot assembly 2 numbered x to the shot rod 21, and inputted into the control module 4, 0≤Ax≤1, when Ax<0, Ax=0, when Ax>1, Ax=1; When, in a batch of production, the working condition coefficient Ax of the molten metal of a certain injection assembly 2 numbered x is relatively large, and the normal wear rate of the injection rod 21 is relatively large, the pressure data uploaded by the pressure sensor 3 of the injection rod 21 has a greater probability of detecting that the pressure data change trend is too large when the injection rod 21 is in normal use, resulting in a false alarm, affecting production efficiency, and it is necessary to appropriately relax the judgment standard. At this time, the value of (1+Ax) is relatively large and greater than 0, and the range of [-K1×(1+Ax), K1×(1+Ax)] is expanded, and the judgment standard is relaxed when the molten metal wears the injection rod 21 at a relatively large rate during normal use, thereby improving production efficiency; Similarly, when in a batch of production, the working condition coefficient Ax of the molten metal of a certain injection component 2 numbered x is small, and the normal wear rate of the injection rod 21 is small, when the pressure sensor 3 of the injection rod 21 detects that the pressure data change trend is too large, there is a greater probability that it is caused by the deformation of the injection rod 21, and it is necessary to appropriately tighten the judgment standard and timely detect the use of the injection rod 21. At this time, the value of (1+Ax) is small and greater than 0, and the range of [-K1×(1+Ax), K1×(1+Ax)] is reduced to close to [-K1, K1]. When the normal wear rate of the injection rod 21 caused by the molten metal is small, the tightening of the judgment standard is completed, which further ensures the timely detection of the use of the injection rod 21. By inputting the working condition coefficient of a certain injection assembly 2 in advance and making the control module 4 judge whether the pressure value change trend kxn is too large or too small according to the range [-K1×(1+Ax), K1×(1+Ax)], the judgment standard is relaxed when the wear rate of the injection rod 21 caused by the molten metal in normal use is relatively large, and the judgment standard is tightened when the wear rate of the injection rod 21 caused by the molten metal in normal use is relatively small, thereby further ensuring the timely detection of the use of the injection rod 21 and taking into account both the production efficiency and the timely detection of the use of the injection rod 21.

[0019] In some cases, the deformation speed of the injection rod 21 is low, and the deformation amplitude of each time is small, resulting in a small change amplitude of the pressure data. The pressure data detected by the pressure sensor 3 each time is equivalent to the change rate of the previous pressure data. When the control module 4 only judges by the pressure data change rate, in this case, there is a probability that it cannot detect the serious deformation caused by long-term small deformation. For this reason, the control module 4 groups the pressure data Pxn from the pressure sensor 3 with the same number into a group according to the chronological order each time after receiving the pressure data Pxn, and calculates the pressure mean Pjxn from the most recently uploaded m data in each group of data. The control module 4 determines whether the variance of several pressure mean values ​​Pjxn from the injection rod 21 with the same number is greater than the pre-input variance threshold, and issues an alarm when the judgment result is yes; Specifically, the control module 4 stores at most 50 data in the data group consisting of the pressure data from the pressure sensor 3 with the same number. At this time, each data group represents the data uploaded for the last 50 times. The mean value Pjxn of each data group represents the mean value of the pressure data detected for the last 50 times by a pressure sensor 3 of a certain injection rod 21, and further represents the pressure on a certain part of the injection rod 21 in the current time period. When in use, since there are two squeezing rods 21 in this embodiment, and each squeezing rod 21 has eight pressure sensors 3, there are 16 groups of data in total. After receiving the pressure data Pxn each time, the control module 4 compiles the eight pressure data of the first and second squeezing rods 21 into the corresponding data groups according to the numbers of the pressure sensors 3, and simultaneously calculates the variance of the eight data groups composed of the pressure data uploaded by the eight sensors in the first squeezing rod 21 and the variance of the eight data groups composed of the pressure data uploaded by the eight sensors in the second squeezing rod 21. After the two variances are calculated, it is determined whether they exceed the threshold value; When the tightness of each part of the injection rod 21 and the inner wall of the injection channel 22 is different due to the long-term small deformation, which leads to different pressure data of each part at a certain time point, and the pressure mean values ​​Pjxn obtained from several data groups of several injection rods 21 are greatly different from each other, which leads to a large variance, the control module 4 completes the judgment of the deformation of the injection rod 21. At this time, the operator needs to check and intervene, and the control module 4 sends an alarm signal to complete the detection of the use of the injection rod 21; By enabling the control module 4 to group the data from the same pressure sensor 3 and calculate the mean, and to determine whether the mean variance of several data groups in the same injection rod 21 exceeds a threshold value, the pressure difference of several parts of the injection rod 21 can be detected when the deformation degree of the injection rod 21 is relatively slow, thereby detecting the deformation of the injection rod 21 as early as possible, and further improving the detection effect.

[0020] In long-term die-casting operations, the injection rod 21 will automatically wear out as it is used. The pressure data uploaded by the pressure sensor 3 in the worn injection rod 21 has a greater probability of detecting that the pressure data change trend is too large when the injection rod 21 is in normal use, resulting in a false alarm and affecting production efficiency. To avoid such a situation, the control module 4 is used to count the number of times the injection rod 21 performs injection, z. Each time the control module 4 receives the pressure data Pxn of a certain injection rod 21, it calculates the change trend kxn relative to the last uploaded Pxn. The control module 4 determines whether the change trend kxn of each group of pressure data over time exceeds [-K1×(1+Ax)×(1+A2), K1×(1+A1)×(1+A2)], and issues an alarm when the judgment result is yes; wherein A2=z / z0×d, 0≤A2≤1, when A2<0, A2=0, when A2>1, A2=1; When the value of z is large, it means that the degree of automatic wear of the injection rod 21 is large with use. When the injection rod 21 is used normally, the probability of detecting that the pressure data change trend is too large is high. At this time, it is necessary to further relax the judgment standard. At this time, the value of A2 is large, the value of (1+A2) is large and greater than 1, and the range of [-K1×(1+Ax)×(1+A2), K1×(1+A1)×(1+A2)] is large. The relaxation of the judgment standard when the degree of automatic wear is large is completed, ensuring production efficiency; Similarly, when the value of z is small, the degree of wear of the injection rod 21 during normal use is small. When the pressure sensor 3 of the injection rod 21 detects that the trend of pressure data change is too large, there is a greater probability that the injection rod 21 is deformed. It is necessary to appropriately tighten the judgment standard and timely detect the use of the injection rod 21. At this time, the value of A2 is small, the value of (1+A2) is small and greater than 1, and the range of [-K1×(1+Ax)×(1+A2), K1×(1+A1)×(1+A2)] is small, close to [-K1×(1+Ax), K1×(1+Ax)], and the tightening of the judgment standard when the degree of wear is low is completed, ensuring the immediate detection of the use. By making the control module 4 count the number of times z that the injection rod 21 executes injection, and making the control module 4 judge whether the pressure value change trend kxn is too large or too small according to the range [-K1×(1+Ax)×(1+A2), K1×(1+A1)×(1+A2)], the judgment standard is relaxed when the injection rod 21 is worn to a large extent due to normal use, and the judgment standard is tightened when the injection rod 21 is worn to a small extent due to normal use by the molten metal, thereby further ensuring the timely detection of the use of the injection rod 21, and taking into account both the production efficiency and the timely detection of the use of the injection rod 21.

[0021] In the above method, whether judging by the change rate of the pressure data on the bed by a certain pressure sensor 3, or judging by the variance of several groups of means composed of several groups of pressure data, it takes a period of time to collect data before it is judged with a high probability that deformation occurs. In order to improve the detection efficiency of deformation based on pressure data, the control module 4 is pre-input with a difference threshold C1. The setting positions of several pressure sensors 3 in the two injection assemblies 2 relative to the axis of the injection rod 21 are the same. The control module 4 assigns the same number to the pressure sensors 3 in the two injection rods 21 with the same orientation relative to the axis of the injection rod 21. After receiving the pressure data Pxn of the two injection rods 21 each time, the control module 4 calculates the change trend kxn relative to the last uploaded Pxn, and judges whether the absolute value C of the difference between the two kxn data with the same n exceeds C1. The control module 4 issues an alarm when the judgment result is yes; Specifically, the setting position of the injection rod 21 makes each pressure sensor 3 with the same number have the same angle relative to the axis of the injection rod 21. For example, in this embodiment, the eight pressure sensors 3 in the first injection rod 21 and the second injection rod 21 are all numbered 1 to 8, and the direction perpendicular to the ground is taken as the top, and the bottom surface of the injection rod 21 is observed from the punch to the cavity 1. The No. 1 sensor in the two injection rods 21 is directly above the axis of the injection rod 21, and the No. 2 to No. 8 sensors are arranged in a ring array clockwise around the axis, that is, at this time, the No. 5 pressure sensor 3 in the two pressure sensors 3 is directly below the axis. At this time, the pressure data uploaded by the pressure sensors 3 with the same number from the two injection rods 21 reflects the pressure on the same part of the two injection rods 21; When one of the injection rods 21 is slightly deformed, the pressure of at least one part of the injection rod 21 changes, causing the pressure data of at least one numbered pressure sensor 3 to change, and the change trend of the pressure data uploaded multiple times changes. At this time, when the other injection rod 21 is in normal state, the pressure of the same part of the other injection rod 21 remains unchanged, and the change trend of the pressure data uploaded by the same numbered pressure sensor 3 of the other injection rod 21 remains unchanged, which is different from the change trend of the same numbered pressure sensor 3 of the first injection rod 21. At this time, the value of C=|k1n-k2n| is greater than 0. When the degree of deformation is large, the value of C=|k1n-k2n| is large, exceeding the difference threshold C1. At this time, the control module 4 determines that the pressures of the same parts of the two injection rods 21 are inconsistent, and at least one injection rod 21 has undergone a relatively obvious deformation. At this time, the control module 4 sends an alarm signal; By making the control module 4 compare whether the trend difference of the pressure data uploaded by the injection sensor at the same position of the two injection rods 21 is greater than the threshold value, it is further determined whether the pressure at the same position of the two injection rods 21 is consistent. When at least one of the injection rods 21 undergoes a relatively obvious deformation, resulting in inconsistent pressure at the same position, the deformation is detected, further ensuring timely detection of the usage status.

[0022] A control panel is also included, which is used to enter the values ​​of K1, K2, C1 and C2.

[0023] It also includes an alarm, which is electrically connected to the control module 4, and the control module 4 sends out an alarm through the alarm.

[0024] The working principle and use process of the present invention: When in use, the molten metal is injected into the injection path 22, and the punch drives the injection rod 21 to move along the injection path 22 toward the cavity 1, thereby completing the pressing of the molten metal into the cavity 1; The control module 4 assigns numbers to the pressure sensors 3 in the two injection rods 21. Each time the control module 4 receives pressure data, it groups the pressure data with the same number into a group in chronological order. The control module 4 determines the change trend of each group of data over time. The control module 4 issues an alarm when the change trend of one group of data exceeds a threshold range.

[0025] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A double-shot rod structure for a die-casting mold, characterized in that: It comprises a control module and two injection assemblies, each of the two injection assemblies comprises an injection rod, an injection path, a punch and a detection module, one end of the injection rod is slidably arranged in the injection path, the other end of the injection rod is connected to the punch, the punch is used to drive the injection rod to press the molten metal into the cavity, the detection module comprises a plurality of pressure sensors, the detection module is electrically connected to the control module, a plurality of the pressure sensors are arranged at the contact part between the side surface of the injection rod and the injection path, a plurality of the pressure sensors are arranged in a ring array, and a plurality of the pressure sensors are arranged to detect the pressure they are subjected to in real time and upload the pressure data to the control module; The control module assigns numbers to several pressure sensors in the two injection rods respectively. After receiving pressure data each time, the control module groups the pressure data from the same number into a group in chronological order. The control module determines the change trend of each group of data over time, and the control module issues an alarm when the change trend of one group of data exceeds a threshold range.

2. The double-shot rod structure of a die-casting mold according to claim 1, characterized in that: The control module assigns a number x to each of the two injection rods, and assigns a number n to each of the pressure sensors in the two injection rods. The control module is pre-input with a trend threshold range [-K1, K1]. Each time the control module receives pressure data Pxn of a certain injection rod, it calculates a change trend kxn relative to the last uploaded Pxn. The control module determines whether the change trend kxn of each set of pressure data over time exceeds [-K1, K1], and issues an alarm if the judgment result is yes.

3. The double-shot rod structure of a die-casting mold according to claim 2, characterized in that: The control module is respectively input with the working condition coefficients Ax of the two injection rods. Each time the control module receives the pressure data Pxn of a certain injection rod, it calculates the change trend kxn relative to the last uploaded Pxn. The control module determines whether the change trend kxn of each set of pressure data over time exceeds [-K1×(1+Ax), K1×(1+Ax)], and issues an alarm when the judgment result is yes.

4. The double-shot rod structure of a die-casting mold according to claim 2, characterized in that: Each time the control module receives pressure data Pxn, it groups the pressure data Pxn from the pressure sensors with the same number into a group in chronological order, and calculates the pressure mean Pjxn from the most recently uploaded m data in each group of data. The control module determines whether the variance of several pressure mean values ​​Pjxn from the injection rods with the same number is greater than a pre-input variance threshold, and issues an alarm if the judgment result is yes.

5. The double-shot rod structure of a die-casting mold according to claim 3, characterized in that: The control module is used to count the number of times z that the injection rod executes injection. Each time the control module receives the pressure data Pxn of a certain injection rod, it calculates the change trend kxn relative to the last uploaded Pxn. The control module determines whether the change trend kxn of each set of pressure data over time exceeds [-K1×(1+Ax)×(1+A2), K1×(1+A1)×(1+A2)], and issues an alarm when the judgment result is yes; wherein A2=z / z0×d, 0≤A2≤1.

6. The double-shot rod structure of a die-casting mold according to claim 2, characterized in that: The control module is pre-input with a difference threshold C1, and the setting positions of several pressure sensors in the two injection assemblies relative to the injection rod axis are the same. The control module assigns the same number to the pressure sensors in the two injection rods with the same orientation relative to the injection rod axis. Each time the control module receives the pressure data Pxn of the two injection rods, it calculates the change trend kxn relative to the last uploaded Pxn, and determines whether the absolute value C of the difference between two kxn data with the same n exceeds C1. The control module issues an alarm when the judgment result is yes.

7. The double-shot rod structure of a die-casting mold according to claim 6, characterized in that: A control panel is also included, and the control panel is used to input the values ​​of K1, K2, C1 and C2.

8. The double-shot rod structure of a die-casting mold according to claim 1, characterized in that: It also includes an alarm, which is electrically connected to the control module, and the control module sends out an alarm through the alarm.

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