A double injection rod structure of a die-casting mold

Abstract

The application relates to a double-pressure injection rod structure of a die-casting die, and belongs to the technical field of die-casting equipment, which comprises a control module and two pressure injection assemblies. Each of the two pressure injection assemblies comprises a pressure injection rod, a pressure injection channel, a punch and a detection module. One end of the pressure injection rod is slidably arranged in the pressure injection channel, and the other end of the pressure injection rod is connected with the punch. The punch is used for driving the pressure 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 plurality of pressure sensors are arranged on the side surface of the pressure injection rod and are in contact with the pressure injection channel. The plurality of pressure sensors upload pressure data to the control module. The control module assigns numbers to the plurality of pressure sensors in the two pressure injection rods. The control module judges the change trend of each group of data over time. The control module issues an alarm when the change trend of one group of data exceeds a threshold range. The application can detect the use of the pressure injection rod in time.

Description

Technical Field

[0001] This invention belongs to the field of die casting equipment technology, and specifically relates to a double injection rod structure for a die casting mold. Background Technology

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

[0003] Conventional die-casting machines have a single-injection structure, which presents the following problems: The injection cylinder in a single-injection structure only has one injection speed and pressure, resulting in a limited adjustable pressure range. Furthermore, because 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, it forms a solid-liquid mixture, resulting in poor mechanical properties. To address this, Chinese patent CN113084120A discloses a dual-injection rod structure for a die-casting mold, including a fixed mold mounted on a die-casting machine template. The fixed mold has two symmetrically distributed molten cup mounting ports, each housing a molten cup. The mold core of the fixed mold has a casting system cavity corresponding to the two molten cups. An injection structure is located behind the fixed mold, comprising two injection rods. The two injection rods are each connected to a punch, and the punches on the two injection rods are slidably fitted into the two molten cups. The rear ends of the two injection rods are connected to a double injection rod connecting seat, and the rear end of the double injection rod connecting seat is connected to the piston of the die-casting machine injection cylinder. By setting two injection rods, this design improves the problem of poor forming quality due to the excessively long aluminum liquid filling path during die casting, reduces injection time, and improves production efficiency, providing a new method for die casting ultra-large parts. In the above structure, the injection rods are subjected to high pressure and temperature when injecting molten metal into the mold cavity. Under long-term use, the injection rods are likely to deform and be damaged. However, the above solution does not detect the deformation of the injection rods, which may lead to the continued use of the injection rods in a damaged state, damaging the die-casting machine and affecting the injection of molten metal, thus affecting the quality of the die-cast product. Therefore, a double injection rod structure for die casting molds that can detect the usage of the injection rods in a timely manner is needed. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a dual injection rod structure for die casting molds, which features the ability to promptly detect the usage status of the injection rods.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A dual-injection rod structure for a die-casting mold includes a control module and two injection assemblies. Each injection assembly includes an injection rod, an injection channel, a punch, and a detection module. One end of the injection rod is slidably disposed within the injection channel, and the other end of the injection rod is connected to the punch. The punch is used to drive the injection rod to press molten metal into the mold cavity. The detection module includes several pressure sensors. The detection module is electrically connected to the control module. The pressure sensors are disposed on the side surface of the injection rod in contact with the injection channel. The pressure sensors are arranged in a ring array and are used to detect the pressure they receive in real time and upload the pressure data to the control module.

[0007] The control module assigns numbers to several pressure sensors in the two injection rods. After receiving pressure data each time, the control module groups the pressure data from the same number into a group according to the chronological order. The control module judges the trend of each group of data over time. When the trend of one group of data exceeds a threshold range, the control module issues an alarm.

[0008] As a preferred embodiment of the present invention, 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 pre-inputs a trend threshold range [-K1, K1]. Each time the control module receives pressure data Pxn from a certain injection rod, it calculates the change trend kxn relative to the previously 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 when the determination result is yes.

[0009] As a preferred technical solution of the present invention, the control module is respectively input with the working condition coefficient Ax of two injection rods. After receiving the pressure data Pxn of a certain injection rod each time, the control module calculates the change trend kxn relative to the previously uploaded Pxn. The control module determines whether the change trend kxn of each pressure data over time exceeds [-K1×(1+Ax),K1×(1+Ax)], and issues an alarm when the determination result is yes.

[0010] As a preferred technical solution of the present invention, after receiving pressure data Pxn each time, the control module groups the pressure data Pxn from the same numbered pressure sensor into a group according to the time sequence, and calculates the average pressure Pjxn from the most recently uploaded m data in each group. The control module determines whether the variance of several average pressure Pjxn from the same numbered injection rod is greater than a pre-input variance threshold, and issues an alarm when the determination result is yes.

[0011] As a preferred embodiment of the present invention, the control module is used to count the number of times the injection rod performs injection z. Each time the control module receives the pressure data Pxn of a certain injection rod, it calculates the change trend kxn relative to the previously 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 determination result is yes; where A2=z / z0×d, 0≤A2≤1.

[0012] As a preferred embodiment of the present invention, the control module is pre-inputting a difference threshold C1. Several pressure sensors in the two injection assemblies are positioned in the same location relative to the injection rod axis. The control module assigns the same number to the pressure sensors in the two injection rods that are in the same orientation relative to the injection rod axis. Each time the control module receives pressure data Pxn from the two injection rods, it calculates the trend kxn of the change relative to the previously uploaded Pxn and determines whether the absolute value C of the difference between two kxn data points with the same n exceeds C1. The control module issues an alarm when the determination result is yes.

[0013] As a preferred embodiment of the present invention, it further includes a control panel, which is used to input the values ​​of K1, K2, C1 and C2.

[0014] As a preferred embodiment of the present invention, it further includes an alarm, which is electrically connected to the control module, and the control module issues an alarm through the alarm.

[0015] The beneficial effects of this invention are as follows:

[0016] (1) By setting up a control module and several pressure sensors that upload their own pressure data to the control module, and making the control module determine whether the rate of change of the pressure data uploaded by several pressure sensors is higher than the threshold, when the pressure at a certain part of the injection rod increases or decreases significantly in a short time, indicating that the injection rod is deforming, an alarm is issued to complete the timely detection of the use of the injection rod.

[0017] (2) By pre-inputting the working condition coefficient of a certain injection component, 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 molten metal on the injection rod is large during normal use, and the judgment standard is tightened when the wear rate of the molten metal on the injection rod is small during normal use. This further ensures timely detection of the use of the injection rod, taking into account both production efficiency and timely detection of the use of the injection rod.

[0018] (3) By having the control module group the data from the same pressure sensor and calculate the mean, and determine whether the mean variance of several data groups in the same injection rod exceeds the 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.

[0019] (4) By having the control module count the number of times the injection rod performs injection z, and having 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 wear of the injection rod is large during normal use, and tightened when the wear of the injection rod by the molten metal is small during normal use. This further ensures timely detection of the use of the injection rod, taking into account both production efficiency and timely detection of the use of the injection rod.

[0020] (5) By comparing the trend of the pressure data uploaded by the pressure sensor at the same part of the two injection rods with the control module, it is determined whether the pressure at the same part of the two injection rods is consistent. When at least one injection rod has undergone significant deformation, resulting in inconsistent pressure at the same part, deformation is detected, which further ensures timely detection of usage conditions. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the injection assembly of the present invention;

[0024] Figure 3 This is a schematic radial cross-sectional view of the injection rod of the present invention;

[0025] Figure 4 This is a block diagram of the control loop of the present invention;

[0026] Explanation of key component symbols:

[0027] In the diagram: 1. Cavity; 2. Injection assembly; 21. Injection rod; 22. Injection channel; 3. Pressure sensor; 4. Control module. Detailed Implementation

[0028] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0029] Please see Figure 1-4 A dual-injection rod structure for a die-casting mold includes two injection components 2. Each injection component 2 includes an injection rod 21, an injection channel 22, and a punch. One end of the injection rod 21 is slidably disposed in the injection channel 22, and the other end of the injection rod 21 is connected to the punch. The punch is used to drive the injection rod 21 to press molten metal into the cavity 1.

[0030] Specifically, both injection components 2 are connected to the cavity 1 through the injection channel 22. One end of the injection channel 22 is connected to the cavity 1, and the other end of the injection channel 22 is slidably provided with an injection rod 21. In use, 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 cavity 1, thereby pressing the molten metal into the cavity 1.

[0031] In the above scheme, the injection rod 21 will be subjected to large pressure and temperature when injecting molten metal into the cavity 1. Under long-term use, the injection rod 21 is likely to be deformed and damaged. However, the above scheme does not detect the deformation of the injection rod 21, which may lead to the continued use of the injection rod 21 in a damaged state, causing damage to the die casting machine and affecting the injection of molten metal, thereby affecting the quality of the die casting product. In order to detect the usage of the injection rod 21 in a timely manner, a control module 4 is also included. Each of the two injection components 2 includes a detection module. The detection module includes several pressure sensors 3. The detection module is electrically connected to the control module 4. The pressure sensors 3 are set on the side surface of the injection rod 21 in contact with the injection channel 22. The pressure sensors 3 are arranged in a ring array. The pressure sensors 3 are used to detect the pressure they are subjected to in real time and upload the pressure data to the control module 4.

[0032] Specifically, since one end of the injection rod 21 is slidably disposed in the injection channel 22, the part of the injection rod 21 disposed in the injection channel 22 is defined as the inner section. Several pressure sensors 3 are arranged in a ring array on the surface of the inner section of the injection rod 21, and the projection positions of the several pressure sensors 3 on the axis of the injection rod 21 coincide with each other. At this time, the several pressure sensors 3 can detect the extrusion force between the injection rod 21 part in which they are located and the injection channel 22.

[0033] When in use, the injection rod 21 slides within the injection channel 22. When the injection rod 21 is in a normal state and its shape has not changed, the pressure of each part of the inner section of the injection rod 21 on the inner wall of the injection channel 22 is approximately equal. At this time, the pressure data uploaded by several pressure sensors 3 are approximately equal. When the structure of the injection rod 21 is abnormal and it bends or twists, some parts of the inner section of the injection rod 21 are squeezed against the inner wall of the injection channel 22, while others are moved away from the inner wall of the injection channel 22. The pressure of each part of the inner section of the injection rod 21 on the injection channel 22 is not equal.

[0034] Meanwhile, since the injection rod 21 is usually made of a metal material with high hardness and strength, the deformation speed of the injection rod 21 is relatively slow. When a fixed threshold is set, and the pressure at a certain point is judged to exceed or fall below the threshold, and then it is judged that the deformation has caused the pressure at each point to be different, it is judged that the pressure at each point has deviated significantly. When this is judged, the injection rod 21 has undergone more obvious deformation, which may have already damaged the die casting machine. Therefore, it is necessary to detect the pressure changes at each point caused by deformation in a timely manner. For this purpose, the control module 4 assigns numbers to several pressure sensors 3 in the two injection rods 21. After receiving pressure data each time, the control module 4 groups the pressure data from the same number into a group according to the time sequence. The control module 4 judges the change trend of each group of data over time. When the change trend of one group of data exceeds the threshold range, the control module 4 issues an alarm.

[0035] Specifically, the control module 4 has a pre-input value of K1, where K1>0. The control module 4 assigns a number x to each of the two injection rods 21 and assigns a number n to each of the pressure sensors 3 in the two injection rods 21. The control module 4 has a pre-input trend threshold range [-K1, K1]. Each time the control module 4 receives pressure data Pxn from a certain injection rod 21, it calculates the change trend kxn relative to the previously uploaded Pxn. The control module 4 determines whether the change trend kxn of each set of pressure data over time exceeds [-K1, K1], and issues an alarm when the determination result is yes.

[0036] Where, 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 a total of 8 pressure sensors 3 in each injection rod 21, so n=1, 2, ..., 8. t1 and t2 are the number of seconds that have passed relative to the standard time point for the current uploaded pressure data and the time point of the last upload, respectively. t1>t2, and the value of t1-t2 is the time interval for the pressure sensor 3 to upload pressure data. In this embodiment, since the pressure sensor 3 uploads pressure data once per second, t1-t2=1. At this time, Pxnt1 and Pxnt2 are the pressure data uploaded successively by the same numbered pressure sensor 3 in the same injection rod 21, and kxn is the rate of change of pressure with time at the location near the same numbered pressure sensor 3 in the same injection rod 21.

[0037] 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 indicates that the pressure at this part of the injection rod 21 has a large trend of increasing or decreasing in a short period of time. At this time, there is a high probability that the injection rod 21 is undergoing deformation, and the operator needs to check and intervene. At this time, the control module 4 issues an alarm signal to complete the detection of the usage status of the injection rod 21.

[0038] 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 does not show an obvious trend of increasing or decreasing in a short time, and the deformation of the injection rod 21 is not obvious, so no operator needs to check or intervene.

[0039] By setting up a control module 4 and several pressure sensors 3 that upload their own pressure data to the control module 4, and having the control module 4 determine whether the rate of change of the pressure data uploaded by the pressure sensors 3 is higher than a threshold, an alarm is issued when the pressure at a certain part of the injection rod 21 increases or decreases significantly in a short period of time, indicating that the injection rod 21 is undergoing deformation, thus completing the timely detection of the usage status of the injection rod 21.

[0040] In some applications, it is necessary to mix two molten metal raw materials with slightly different compositions in cavity 1. This improves the mechanical properties of the joint between the two molten metals or creates differences in the mechanical properties between the two parts of the die-cast metal part. In this case, the molten metal compositions in the two injection components 2 are different, and the reaction forces exerted by the molten metal on the injection rods 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 injection components 2 will lead to different long-term forces on the two injection rods 21 and different wear rates during normal use. The injection rod 21 with greater wear will experience... The pressure data uploaded by pressure sensor 3 is more likely to detect excessive pressure data change trend when the injection rod 21 is in normal use, resulting in a false alarm and affecting production efficiency. To avoid this situation, the control module 4 is input with the working condition coefficient Ax of the two injection rods 21 respectively. After receiving the pressure data Pxn of a certain injection rod 21 each time, the control module 4 calculates the change trend kxn relative to the previous uploaded Pxn. The control module 4 judges whether the change trend kxn of each pressure data over time exceeds [-K1×(1+Ax),K1×(1+Ax)], and issues an alarm when the judgment result is yes.

[0041] Specifically, the working condition coefficient Ax of the injection rod 21 is obtained by the operator in advance by calculating the wear rate of the molten metal raw material in the injection assembly 2 numbered x to the injection rod 21 before the start of a certain batch of production, and is input to the control module 4. 0≤Ax≤1, when Ax<0, Ax=0, and when Ax>1, Ax=1.

[0042] In a certain batch of production, if the working condition coefficient Ax of the molten metal of a certain injection component 2 with the number x is large, the wear rate of the injection rod 21 during normal use is large. The pressure data uploaded by the pressure sensor 3 of this injection rod 21 is more likely to detect an excessively large trend in pressure data when the injection rod 21 is in normal use, resulting in a false alarm and affecting production efficiency. It is necessary to appropriately relax the judgment criteria. At this time, the value of (1+Ax) is large and greater than 0, and the range of [-K1×(1+Ax),K1×(1+Ax)] is expanded. When the molten metal causes a large wear rate of the injection rod 21 during normal use, the judgment criteria are relaxed to improve production efficiency.

[0043] Similarly, in a certain batch of production, when the working condition coefficient Ax of the molten metal of a certain injection component 2 with the number x is small, the normal wear rate of the injection rod 21 is small, and when the pressure sensor 3 of this injection rod 21 detects an excessively large trend in pressure data change, it is more likely that the deformation of the injection rod 21 is the cause. It is necessary to tighten the judgment standard appropriately and detect the usage of the injection rod 21 in a timely manner. 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 molten metal on the injection rod 21 is small, the tightening of the judgment standard further ensures the timely detection of the usage of the injection rod 21.

[0044] By pre-inputting the operating condition coefficient of a certain injection component 2, and having the control module 4 determine whether the pressure value change trend kxn is too large or too small based on the range [-K1×(1+Ax), K1×(1+Ax)], the judgment standard is relaxed when the wear rate of the molten metal on the injection rod 21 is large during normal use, and tightened when the wear rate of the molten metal on the injection rod 21 is small during normal use. This further ensures timely detection of the usage of the injection rod 21, balancing production efficiency and timely detection of the usage of the injection rod 21.

[0045] In some cases, the deformation rate of the injection rod 21 is low, and the deformation amplitude of each deformation is small, resulting in a small change in pressure data. The pressure data detected by the pressure sensor 3 each time is equivalent to a small rate of change of the previous pressure data. When the control module 4 judges based solely on the rate of change of pressure data, there is a probability that it will fail to detect severe deformation caused by long-term small-amplitude deformation in this case. Therefore, after receiving pressure data Pxn each time, 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, and calculates the average pressure Pjxn from the m most recently uploaded data in each group. The control module 4 judges whether the variance of several average pressure Pjxn from the same numbered injection rod 21 is greater than the pre-input variance threshold, and issues an alarm when the judgment result is yes.

[0046] Specifically, the control module 4 stores a maximum of 50 data points in a data group consisting of pressure data from pressure sensors 3 with the same number. Each data group represents the most recent 50 uploaded data points, and the average value Pjxn of each data group represents the average value of the pressure data detected by a pressure sensor 3 from a certain injection rod 21 in the most recent 50 times, which in turn represents the pressure on a certain part of the injection rod 21 during the current time period.

[0047] In use, since there are two injection rods 21 in this embodiment, and each injection rod 21 has eight pressure sensors 3, there are a total of 16 sets of data. After receiving the pressure data Pxn each time, the control module 4 will encode the eight pressure data of the first and second injection rods 21 into the corresponding data group according to the pressure sensor 3 number, and at the same time calculate the variance of the eight data groups composed of the pressure data uploaded by the eight sensors in the first injection rod 21 and the variance of the eight data groups composed of the pressure data uploaded by the eight sensors in the second injection rod 21. After the two variances are calculated, it is determined whether they exceed the threshold.

[0048] When the long-term small-amplitude deformation of the injection rod 21 causes different degrees of tightness between the various parts and the inner wall of the injection channel 22, resulting in different pressure data of various parts at a certain point in time, and the average pressure Pjxn obtained from several data sets of several injection rods 21 differs greatly, resulting in 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. The control module 4 issues an alarm signal to complete the detection of the usage of the injection rod 21.

[0049] By having the control module 4 group the data from the same pressure sensor 3 and calculate the mean, and determine whether the mean variance of several data groups in the same injection rod 21 exceeds the threshold, the pressure difference of several parts of the injection rod 21 can be detected when the deformation 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.

[0050] During long-term die-casting operations, the injection rod 21 will wear down automatically with use. The pressure data uploaded by the pressure sensor 3 in the worn injection rod 21 is more likely to detect excessive pressure data changes during normal use, leading to false alarms and affecting production efficiency. To avoid this situation, the control module 4 is used to count the number of injections z performed by the injection rod 21. 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 previously uploaded Pxn. The control module 4 determines whether the change trend kxn of each pressure data over time exceeds [-K1×(1+Ax)×(1+A2),K1×(1+A1)×(1+A2)], and issues an alarm when the result is yes; where A2=z / z0×d, 0≤A2≤1, when A2<0, A2=0, and when A2>1, A2=1.

[0051] When the value of z is large, it means that the pressure rod 21 wears out automatically with use. When the pressure rod 21 is in normal use, there is a high probability that the pressure data change trend is too large. At this time, it is necessary to further relax the judgment criteria. 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. This relaxes the judgment criteria when the degree of automatic wear is large, thus ensuring production efficiency.

[0052] Similarly, when the value of z is small, the wear of the injection rod 21 is small during normal use. When the pressure sensor 3 detects an excessively large trend in pressure data, it is more likely that the deformation of the injection rod 21 is the cause. It is necessary to tighten the judgment standard appropriately and detect the usage of the injection rod 21 in a timely manner. 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)]. This completes the tightening of the judgment standard when the wear is low, ensuring timely detection of the usage.

[0053] By having the control module 4 count the number of injections z performed by the injection rod 21, and by having the control module 4 determine 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 wear of the injection rod 21 during normal use is large, and tightened when the wear of the injection rod 21 during normal use is small. This further ensures timely detection of the usage of the injection rod 21, taking into account both production efficiency and timely detection of the usage of the injection rod 21.

[0054] In the above method, whether the judgment is made by the rate of change of pressure data on a certain pressure sensor 3 or by the variance of several sets of pressure data, a period of data collection is required before a large probability of determining that deformation has occurred. In order to improve the detection efficiency of deformation based on pressure data, the control module 4 is pre-inputting a difference threshold C1. The positions of several pressure sensors 3 in the two injection components 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 that are in 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 previously 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.

[0055] Specifically, the positioning of the injection rod 21 is such that the angle of each pressure sensor 3 with the same number relative to the axis of the injection rod 21 is the same. For example, in this embodiment, the eight pressure sensors 3 in the first injection rod 21 and the second injection rod 21 are numbered 1 to 8, and the direction perpendicular to the ground is taken as the top. When looking at the bottom surface of the injection rod 21 from the punch to the cavity 1, the number 1 sensor in both injection rods 21 is directly above the axis of the injection rod 21, and the number 2 to 8 sensors are arranged in a ring array around the axis in a clockwise direction. That is, at this time, the number 5 pressure sensor 3 in both pressure sensors 3 is directly below the axis. At this time, the pressure data uploaded from 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.

[0056] When one of the injection rods 21 undergoes slight deformation, the pressure at at least one part of this injection rod 21 changes, causing a change in the pressure data received by at least one numbered pressure sensor 3. The trend of the pressure data uploaded by the sensor changes. At this time, when the other injection rod 21 is in normal condition, the pressure at the same part of the other injection rod 21 remains unchanged, and the trend of the pressure data uploaded by the other injection rod 21 and the numbered pressure sensor 3 remains unchanged, which differs from the trend of the first injection rod 21 and the numbered pressure sensor 3. 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 pressure at the same part of the two injection rods 21 is inconsistent, and at least one injection rod 21 has undergone significant deformation. At this time, the control module 4 issues an alarm signal.

[0057] By comparing the trend of the pressure data uploaded by the pressure sensors at the same location between the two injection rods 21, the control module 4 determines whether the pressure at the same location of the two injection rods 21 is consistent. This enables the detection of deformation when at least one injection rod 21 has undergone significant deformation, resulting in inconsistent pressure at the same location, thus ensuring timely detection of usage conditions.

[0058] It also includes a control panel for entering the values ​​of K1, K2, C1, and C2.

[0059] It also includes an alarm, which is electrically connected to the control module 4, and the control module 4 issues an alarm through the alarm.

[0060] Working principle and usage process of this invention:

[0061] In use, 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 cavity 1, thus completing the injection of molten metal into the cavity 1;

[0062] The control module 4 assigns numbers to several pressure sensors 3 in the two injection rods 21. After receiving pressure data each time, the control module 4 groups the pressure data from the same number into a group according to the time sequence. The control module 4 judges the trend of each group of data over time. When the trend of one group of data exceeds the threshold range, the control module 4 issues an alarm.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A double injection rod structure for a die-casting mold, characterized in that: The device includes a control module and two injection assemblies. Each injection assembly includes an injection rod, an injection channel, a punch, and a detection module. One end of the injection rod is slidably disposed within the injection channel, and the other end of the injection rod is connected to the punch. The punch is used to drive the injection rod to press molten metal into the cavity. The detection module includes several pressure sensors. The detection module is electrically connected to the control module. The pressure sensors are disposed on the side surface of the injection rod in contact with the injection channel. The pressure sensors are arranged in a ring array. The pressure sensors are used to detect the pressure they receive in real time and upload the pressure data to the control module. The control module assigns a number to each of the pressure sensors in the two injection rods. After receiving pressure data each time, the control module groups the pressure data from the same number into a group according to the time sequence. The control module judges the trend of each group of data over time. When the trend of one group of data exceeds the threshold range, the control module issues an alarm. 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-inputting a trend threshold range [-K1, K1]. The control module receives the working condition coefficients Ax of two injection rods respectively. Each time the control module receives the pressure data Pxn of a certain injection rod, it calculates the change trend kxn relative to the previously 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 determination result is yes. The operating condition coefficient Ax is obtained by the operator in advance before the start of a certain batch of production by calculating the wear rate of the injection rod on the injection rod in the injection assembly numbered x, where 0≤Ax≤1; when the operating condition coefficient Ax of the molten metal in a certain injection assembly numbered x is large in a certain batch of production, the normal wear rate of the injection rod is large; when the operating condition coefficient Ax of the molten metal in a certain injection assembly numbered x is small in a certain batch of production, the normal wear rate of the injection rod is small. Each time the control module receives pressure data Pxn, it groups the pressure data Pxn from the same numbered pressure sensor into a group according to the chronological order, and calculates the average pressure Pjxn from the m most recently uploaded data in each group. The control module then determines whether the variance of several average pressure values ​​Pjxn from the same numbered injection rod is greater than a pre-input variance threshold, and issues an alarm when the determination result is yes.

2. The double injection rod structure of a die-casting mold according to claim 1, characterized in that: The control module is pre-inputting a difference threshold C1. Several pressure sensors in the two injection assemblies are positioned in the same way relative to the axis of the injection rod. The control module assigns the same number to the pressure sensors in the two injection rods that are in the same orientation relative to the axis of the injection rod. Each time the control module receives the pressure data Pxn from the two injection rods, it calculates the trend kxn of the change relative to the previously uploaded Pxn and determines whether the absolute value C of the difference between the two kxn data with the same n exceeds C1. The control module issues an alarm when the determination result is yes.

3. The double injection rod structure of a die-casting mold according to claim 2, characterized in that: It also includes a control panel for inputting the values ​​of K1, K2, and C1.

4. The double injection 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 issues an alarm through the alarm.

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