A load simulation system for a die-casting machine

Abstract

The present application discloses a load simulation system for a die-casting machine, including a monitoring module, a controller, and a load simulation module; the load simulation module cooperates with the injection end of the to-be-tested injection module through a load simulation end; the monitoring module is installed on the to-be-tested injection module for monitoring the actual load force received by the to-be-tested injection module; the controller is respectively signal-connected to the monitoring module and the load simulation module. The controller is adapted to control the load simulation module to output a simulated load according to the input load force curve, and at the same time, the controller is adapted to adjust the simulated load output by the load simulation module according to the actual load force fed back by the monitoring module. The beneficial effects of the present application: By controlling the oil return damping of the oil cylinder, the simulation of the actual load of the to-be-tested injection module is realized, so that the accuracy of the test simulation data of the to-be-tested injection module can be guaranteed. At the same time, there is no need to conduct a whole-machine test on a traditional die-casting machine, which can effectively reduce the test cost.

Description

Technical Field

[0001] This application relates to the technical field of die-casting machines, and particularly to a die-casting machine load simulation system. Background Art

[0002] For die-casting machine manufacturers, when conducting in-site tests on the injection part of die-casting machines, they all adopt the method of hitting an empty hammer for testing. During the test, the hammer head has no actual load, which is very different from the actual on-site production process of die-casting machines. Therefore, during the on-site installation process of die-casting machines, it is often necessary to adjust the functions of die-casting machines on-site.

[0003] Moreover, when designing new machines or debugging new algorithms, the air injection test is not sufficient to identify design problems and control algorithm problems. If conducting a full-machine actual injection test, the cost is too high, and the full-machine actual injection test will also slow down the R & D progress. Therefore, there is an urgent need for a device or system that can simulate the actual load during in-site tests. Summary of the Invention

[0004] One of the purposes of this application is to provide a die-casting machine load simulation system that can solve at least one defect in the above background art.

[0005] To achieve at least one of the above purposes, the technical solution adopted in this application is: a die-casting machine load simulation system, including a monitoring module, a controller, and a load simulation module; the load simulation module cooperates with the injection end of the to-be-tested injection module through a load simulation end; the monitoring module is installed on the to-be-tested injection module for monitoring the actual load force received by the to-be-tested injection module; the controller is respectively signal-connected to the monitoring module and the load simulation module. The controller is adapted to control the load simulation module to output a simulated load according to the input load force curve, and at the same time, the controller is adapted to adjust the simulated load output by the load simulation module according to the actual load force fed back by the monitoring module.

[0006] Preferably, the load simulation module includes an oil tank, an oil cylinder, an oil filling circuit, and a control circuit; the oil cylinder uses a piston rod as the load simulation end of the load simulation module; the oil filling circuit is adapted to pre-fill the oil cylinder with the oil in the oil tank until the piston rod fully extends; one end of the control circuit is connected to the rodless cavity of the oil cylinder, and the other end communicates with the oil tank; the control circuit is adapted to control the oil return pressure of the rodless cavity of the oil cylinder by adjusting the opening degree of the circuit during the injection test of the to-be-tested injection module.

[0007] Preferably, the control circuit includes a servo valve, and the servo valve adjusts the oil return pressure of the rodless cavity of the oil cylinder by adjusting the opening degree.

[0008] Preferably, the control loop further includes a first accumulator and a second regulating valve group; one end of the second regulating valve group is connected to the servo valve, and the other end is communicated with the oil tank; the first accumulator is connected in parallel between the servo valve and the second regulating valve group; when performing the slow injection test on the injection module to be tested, the second regulating valve group is turned on to allow the oil in the rodless cavity of the oil cylinder to directly return to the oil tank; when performing the fast injection test on the injection module to be tested, the second regulating valve group is closed to allow the oil in the rodless cavity of the oil cylinder to return to the first accumulator.

[0009] Preferably, the force obtained by multiplying the back pressure of the oil return provided by the first accumulator by the cross-sectional area of the rodless cavity of the oil cylinder is less than or equal to the minimum load force required for the injection module to be tested.

[0010] Preferably, the load simulation module includes a first regulating valve group connected to the rodless cavity of the oil cylinder, and both the control loop and the oil filling loop are connected to the rodless cavity of the oil cylinder through the first regulating valve group; the first regulating valve group is in a fully open state when replenishing oil to the oil cylinder; the first regulating valve group is in a one-way open state when performing the slow and fast injection tests on the injection module to be tested; the first regulating valve group is in a fully closed state when performing the boosting injection test on the injection module to be tested.

[0011] Preferably, the load simulation module further includes a first pressure sensor and a second pressure sensor; the first pressure sensor is connected to the rodless cavity of the oil cylinder, and the second pressure sensor is connected to the rod end cavity of the oil cylinder; the injection force during the boosting injection test stage of the injection module to be tested is monitored by the first pressure sensor and the second pressure sensor.

[0012] Preferably, the load simulation module further includes a second accumulator, the second accumulator is connected to the rod end cavity of the oil cylinder, and the second accumulator is adapted to replenish oil through the oil filling loop so that the second accumulator continuously replenishes oil to the rod end cavity during the retraction process of the piston rod of the oil cylinder; the oil filling loop is adapted to replenish oil to the oil cylinder first and then to the second accumulator.

[0013] Preferably, the oil filling circuit includes an oil pump, a first one-way valve, and a reversing valve; the reversing valve is connected to the first regulating valve group through the first one-way valve, the reversing valve is directly connected to the rod chamber of the oil cylinder, the input end of the oil pump extends into the oil tank, and the output end of the oil pump is connected to the reversing valve; when filling the oil cylinder, the reversing valve is in the first position, and then the oil in the oil tank is driven by the oil pump and flows through the reversing valve, the first one-way valve, and the first regulating valve group into the rodless chamber of the oil cylinder in sequence, and at the same time, the oil in the rod chamber of the oil cylinder directly flows back to the oil tank; when filling the second accumulator, the reversing valve is in the second position, and then the oil in the oil tank is driven by the oil pump and flows to the second accumulator after passing through the reversing valve.

[0014] Preferably, the oil filling circuit further includes a second one-way valve and a third regulating valve group; the reversing valve is connected to the rod chamber of the oil cylinder through the second one-way valve, one end of the third regulating valve group is connected in parallel between the second one-way valve and the oil cylinder, and the other end of the third regulating valve group communicates with the oil tank; when filling the oil cylinder, the third regulating valve group is in a conducting state; when filling the second accumulator, the third regulating valve group is in a closed state.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows:

[0016] By controlling the oil return damping of the oil cylinder, the actual load of the test injection module can be simulated, so as to ensure the accuracy of the test simulation data of the test injection module. At the same time, there is no need to conduct the whole machine test of the traditional die-casting machine, which can effectively reduce the test cost. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall working process of the present application.

[0018] Figure 2 It is a schematic diagram of the structure of the load simulation module in the present application.

[0019] In the figure: test injection module 100, monitoring module 200, controller 300, load simulation module 400, oil cylinder 401, first regulating valve group 402, control valve 4021, cartridge valve 4022, first pressure sensor 403, servo valve 404, first accumulator 405, second regulating valve group 406, oil pump 407, reversing valve 408, first one-way valve 409, second one-way valve 410, second pressure sensor 411, second accumulator 412, third regulating valve group 413, oil tank 414. Detailed Embodiments

[0020] Next, in combination with specific embodiments, the present application will be further described. It should be noted that in the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0021] In the description of the present application, it should be noted that for the orientation terms, if there are terms such as "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation and position relationship are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as limiting the specific protection scope of the present application.

[0022] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence.

[0023] In the present application, unless otherwise clearly specified and defined, terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may also include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0025] The terms "comprise" and "have" and any variations thereof in the description and claims of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these process, method, product or device.

[0026] One preferred embodiment of this application, as Figure 1 shown, a die-casting machine load simulation system includes a monitoring module 200, a controller 300 and a load simulation module 400. The load simulation module 400 cooperates with the injection end of the to-be-tested injection module 100 through a load simulation end. Thus, when the to-be-tested injection module 100 conducts an injection test, the load simulation module 400 can provide a load resistance to the injection end of the to-be-tested injection module 100 through the load simulation end, so as to ensure that the test process of the to-be-tested injection module 100 can simulate the actual use conditions, and further ensure the accuracy of the test data of the to-be-tested injection module 100. The monitoring module 200 is installed on the to-be-tested injection module 100. The monitoring module 200 can be used to monitor the actual load force received by the to-be-tested injection module 100 and send the monitored data to the controller 300. The controller 300 is respectively signal-connected to the monitoring module 200 and the load simulation module 400; the controller 300 can control the load simulation module 400 to output a simulated load according to the input load force curve, and at the same time, the controller 300 can also adjust the simulated load output by the load simulation module 400 according to the actual load force fed back by the monitoring module 200.

[0027] It can be understood that during the injection test of the injection module 100 to be tested, its injection end will continuously extend. Correspondingly, by the injection end abutting against the load simulation end of the load simulation module 400, the load simulation end can be driven to move. Then, by setting damping for the movement process of the load simulation end, the load force condition encountered by the injection module 100 to be tested during actual operation can be simulated. Moreover, the damping received by the load simulation end of the load simulation module 400 at different moving positions is different, so as to more accurately simulate the actual working condition of the injection module 100 to be tested. Specifically, the damping of the load simulation module 400 is set according to the load force curve during the injection process of the injection module 100 to be tested. The load force curve can be measured by those skilled in the art during the actual use of other equipment of the same type.

[0028] It should be known that there may be a deviation between the load force output by the load simulation module 400 according to the load force curve and the actual load force received by the injection module 100 to be tested due to reasons such as loss. Therefore, in order to ensure that the load force provided by the load simulation module 400 is more in line with the actual situation, the actual load force received by the injection module 100 to be tested can be monitored, and then the simulated load output by the load simulation module 400 can be adjusted according to the monitoring results. For example, if the actual load force received by the injection module 100 to be tested is less than the theoretical load force, the simulated load output by the load simulation module 400 can be reduced, and vice versa. Compared with the traditional method, in this application, by setting the load simulation module 400 as a resistance module to provide the simulation of the load force to the injection module 100 to be tested, the simulation of the actual load of the injection module 100 to be tested can be realized, so as to ensure the accuracy of the test simulation data of the injection module 100 to be tested. At the same time, there is no need to conduct the overall machine test of the traditional die-casting machine, which can effectively reduce the test cost.

[0029] In this embodiment, the specific structures and working principles of the monitoring module 200 and the controller 300 are well-known to those skilled in the art, so they will not be elaborated in detail here. The common monitoring module 200 includes a pressure monitoring unit and a position monitoring unit, such as a pressure sensor and a displacement sensor, etc., so as to monitor the injection position, injection speed, pressure in the rod chamber and non-rod chamber of the injection end of the injection module 100 to be tested, and then the magnitude of the load force received on the injection end at different positions can be calculated, and the calculated load force is used as the actual load force provided by the load simulation module 400 to the injection module 100 to be tested.

[0030] In this embodiment, there are multiple ways for the load simulation module 400 to provide a simulated load. For example, it can be through mechanical drive or hydraulic drive. Considering that the injection molding module 100 to be tested uses a hydraulic drive method, in order to be more in line with the actual situation and improve the response speed of the simulated load, this embodiment preferably adopts a hydraulic loading method; for the convenience of understanding, specific descriptions will be given below.

[0031] Specifically, as Figure 2 shown, the load simulation module 400 includes an oil tank 414, an oil cylinder 401, an oil filling circuit, and a control circuit. The oil cylinder 401 uses the piston rod as the load simulation end of the load simulation module 400, that is, the injection molding module 100 to be tested uses the piston rod of the injection cylinder as the injection end, and the piston rod of the oil cylinder 401 is aligned and connected with the piston rod of the injection cylinder; thus, during the injection test, the piston rod of the injection cylinder can push the piston rod of the oil cylinder 401 to retract during the extension process. At this time, the output of the simulated load can be achieved only by adjusting the pressure in the rodless cavity of the oil cylinder 401.

[0032] Based on the above process of generating the simulated load, in order to ensure that the oil cylinder 401 can meet the injection stroke requirements of the injection cylinder, it is necessary to extend the piston rod of the oil cylinder 401 as much as possible before the injection test. That is, the oil filling circuit can pre-fill the oil cylinder 401 with the oil in the oil tank 414 until the piston rod is fully extended. One end of the control circuit is connected to the rodless cavity of the oil cylinder 401, and the other end communicates with the oil tank 414; the control circuit can control the oil return pressure in the rodless cavity of the oil cylinder 401 by adjusting the opening of the circuit during the injection test of the injection molding module 100 to be tested.

[0033] It can be understood that there are multiple specific structures of the control circuit based on the adjustment of the circuit opening. For example, Figure 2 shown, the control circuit includes a servo valve 404, and the servo valve 404 adjusts the oil return pressure in the rodless cavity of the oil cylinder 401 by adjusting the opening. The specific structure and working principle of the servo valve 404 are well-known technologies to those skilled in the art, so they will not be elaborated in detail here.

[0034] It should be known that the injection test of the injection molding module 100 to be tested includes a slow injection test, a fast injection test, and a boosting injection test; based on the large change in the load force in different injection modes, only controlling the opening of a single servo valve 404 may not be able to adapt to the change in the injection mode. Therefore, this embodiment further improves the specific structure of the control circuit, and the specific solution is as follows.

[0035] Specifically, as Figure 2As shown, the control loop further includes a first accumulator 405 and a second regulating valve group 406. One end of the second regulating valve group 406 is connected to the servo valve 404, and the other end of the second regulating valve group 406 communicates with the oil tank 414; the first accumulator 405 is connected in parallel between the servo valve 404 and the second regulating valve group 406. When performing a slow injection test on the injection module 100 to be tested, the second regulating valve group 406 is turned on, so that the oil in the rodless cavity of the oil cylinder 401 can directly flow back to the oil tank 414. At this time, the rodless oil return pressure of the oil cylinder 401 is controlled by the servo valve 404. When performing a fast injection test on the injection module 100 to be tested, the second regulating valve group 406 is closed, so that the oil in the rodless cavity of the oil cylinder 401 flows back to the first accumulator 405. At this time, the rodless cavity oil return pressure of the oil cylinder 401 is controlled by the servo valve 404 and the first accumulator 405 simultaneously.

[0036] It should be noted that if the first accumulator 405 is not provided, then during the fast injection of the injection module 100 to be tested, the oil in the rodless cavity of the oil cylinder 401 will flow back to the oil tank 414 along the servo valve 404 and the second regulating valve group 406. At this time, the pressure at the end of the servo valve 404 close to the oil cylinder 401 is the rodless cavity oil return pressure of the oil cylinder 401, and the other end of the servo valve 404 is connected to the second regulating valve group 406 in a conducting state, which can be regarded as having no pressure or low pressure. This results in a large pressure difference between the two ends of the servo valve 404, which is likely to cause damage and failure of the servo valve 404, and the excessive pressure difference will also cause certain obstacles to the opening adjustment of the servo valve 404, resulting in a decrease in the opening control response speed of the servo valve 404, thereby affecting the control accuracy of the simulated load.

[0037] However, after the first accumulator 405 is provided in this embodiment, the servo valve 404 can transport the oil in the rodless cavity of the oil cylinder 401 to the first accumulator 405 after the second regulating valve group 406 is closed. At this time, the first accumulator 405 will apply an oil return back pressure to the servo valve 404, which makes the pressure difference between the two ends of the servo valve 404 basically the same or very small, so as to ensure the sensitive opening response speed of the servo valve 404 and at the same time extend the service life of the servo valve 404. The specific structure and working principle of the first accumulator 405 are well-known technologies to those skilled in the art, so they will not be elaborated in detail here.

[0038] It should be noted that the inflation pressure of the first accumulator 405 should not be too high. An excessive inflation pressure will lead to an increase in the back pressure of the return oil, and an excessive back pressure of the return oil will cause the oil in the rodless cavity of the oil cylinder 401 to be unable to be discharged, which will further lead to the failure of the test of the injection molding module 100 to be tested. Therefore, in this embodiment, the inflation pressure of the first accumulator 405 should satisfy that in the rapid injection test stage, the force obtained by multiplying the back pressure of the return oil provided by the first accumulator 405 by the cross-sectional area of the rodless cavity of the oil cylinder 401 is less than or equal to the minimum load force required by the injection molding module 100 to be tested.

[0039] In this embodiment, as Figure 2 shown, the load simulation module 400 further includes a first regulating valve group 402 connected to the rodless cavity of the oil cylinder 401. Both the control circuit and the oil filling circuit are connected to the rodless cavity of the oil cylinder 401 through the first regulating valve group 402. The first regulating valve group 402 is in a fully open state when refilling the oil cylinder 401; the first regulating valve group 402 is in a one-way open state when performing the slow and rapid injection tests of the injection molding module 100 to be tested; the first regulating valve group 402 is in a fully closed state when performing the boosting injection test of the injection molding module 100 to be tested.

[0040] It can be understood that the load force received by the injection molding module 100 to be tested during actual use is resistance rather than elastic force. If the first regulating valve group 402 is not provided in the load simulation module 400, then during the slow injection test or rapid injection test of the injection molding module 100 to be tested, if the injection force applied by the injection molding module 100 to be tested is suddenly cancelled according to the test requirements, it may cause the piston rod of the oil cylinder 401 to pop out and hit the injection molding module 100 to be tested. Therefore, in this embodiment, the first regulating valve group 402 is provided to control the return oil process of the rodless cavity of the oil cylinder 401 to be one-way open, that is, the oil in the rodless cavity of the oil cylinder 401 can only flow to the fuel tank 414 through the first regulating valve group 402.

[0041] In this embodiment, when performing the boosting injection test of the injection molding module 100 to be tested, since the high pressure in the rodless cavity of the oil cylinder 401 is isolated by the first regulating valve group 402, the pressure in the rodless cavity of the oil cylinder 401 at this time will not be transmitted to the servo valve 404, so the injection force of the injection molding module 100 to be tested, that is, the boosting pressure, cannot be obtained. Therefore, in this embodiment, as Figure 2 shown, the load simulation module 400 further includes a first pressure sensor 403 and a second pressure sensor 411; the first pressure sensor 403 is connected to the rodless cavity of the oil cylinder 401, and the second pressure sensor 411 is connected to the rodless cavity of the oil cylinder 401; the injection force during the boosting injection test stage of the injection molding module 100 to be tested is monitored by the first pressure sensor 403 and the second pressure sensor 411.

[0042] It can be understood that the specific structures and working principles of the first pressure sensor 403 and the second pressure sensor 411 are well-known technologies to those skilled in the art, so no detailed description will be given here.

[0043] In this embodiment, during the injection test of the injection module 100 to be tested, the piston rod of the oil cylinder 401 is always in the retracted state, that is, the volume of the rodless cavity of the oil cylinder 401 is continuously decreasing, and then the volume of the rod cavity of the oil cylinder 401 will gradually increase. To maintain the stable operation of the oil cylinder 401, it is necessary to continuously supply oil to the rod cavity of the oil cylinder 401 during the injection test. For the oil supply process of the rod cavity of the oil cylinder 401, it can be directly supplied to the rod cavity of the oil cylinder 401 through the oil filling circuit. However, considering that the oil filling circuit mainly realizes oil supply through the drive of the oil pump 407, and the piston rod of the oil cylinder 401 moves relatively fast during the rapid injection test stage, the response speed of the oil filling circuit may be difficult to meet, resulting in air suction in the rod cavity of the oil cylinder 401. Therefore, the load simulation module 400 can be improved, such as Figure 2 As shown, the load simulation module 400 further includes a second accumulator 412. The second accumulator 412 is connected to the rod cavity of the oil cylinder 401, and the second accumulator 412 can be refilled through the oil filling circuit so that the second accumulator 412 continuously supplies oil to the rod cavity during the retraction of the piston rod of the oil cylinder 401.

[0044] It should be noted that since the second accumulator 412 is connected to the rod cavity of the oil cylinder 401, if the second accumulator 412 is refilled first, or the second accumulator 412 and the oil cylinder 401 are refilled simultaneously, it may cause a relatively large pressure for the piston rod of the oil cylinder 401 to extend. Therefore, in this embodiment, the oil cylinder 401 can be refilled through the oil filling circuit first. After the oil filling of the oil cylinder 401 is completed, the rodless cavity of the oil cylinder 401 is isolated, that is, the piston rod of the oil cylinder 401 cannot retract, and then the second accumulator 412 is refilled through the oil filling circuit. The specific structure and working principle of the second accumulator 412 are well-known technologies to those skilled in the art, so no detailed description will be given here.

[0045] In this embodiment, there are various specific structures of the oil filling circuit. For the convenience of understanding, one of the structures will be described in detail below. As Figure 2 shown, the oil filling circuit includes an oil pump 407, a first one-way valve 409, and a reversing valve 408. The reversing valve 408 is connected to the first regulating valve group 402 through the first one-way valve 409, and the reversing valve 408 is directly connected to the rod cavity of the oil cylinder 401. The input end of the oil pump 407 extends into the fuel tank 414, and the output end of the oil pump 407 is connected to the reversing valve 408.

[0046] When refilling the oil cylinder 401, the reversing valve 408 is in the first position. Then, the oil in the oil tank 414 is driven by the oil pump 407 and flows into the rodless cavity of the oil cylinder 401 successively through the reversing valve 408, the first one-way valve 409, and the first regulating valve group 402. At the same time, the oil in the rod cavity of the oil cylinder 401 directly returns to the oil tank 414. When refilling the second accumulator 412, the reversing valve 408 is in the second position. Then, the oil in the oil tank 414 is driven by the oil pump 407 and flows to the second accumulator 412 after passing through the reversing valve 408. At this time, the first one-way valve 409 isolates the rodless cavity of the oil cylinder 401.

[0047] It should be known that the specific structures and working principles of the reversing valve 408, the first one-way valve 409, and the oil pump 407 are all well-known technologies to those skilled in the art, so they will not be elaborated in detail here. The common reversing valve 408 can adopt a three-position four-way reversing valve, and the specific commutation process can be set according to actual needs.

[0048] In this embodiment, the second accumulator 412 can not only refill the rod cavity of the oil cylinder 401, but also refill the reversing valve 408, which may cause a large pressure difference between the two ends of the reversing valve 408, thus affecting the response speed of the reversing valve 408. Therefore, the oil filling circuit can be further improved, such as Figure 2 As shown, the oil filling circuit further includes a second one-way valve 410 and a third regulating valve group 413. The reversing valve 408 is connected to the rod cavity of the oil cylinder 401 through the second one-way valve 410. One end of the third regulating valve group 413 is connected in parallel between the second one-way valve 410 and the oil cylinder 401, and the other end of the third regulating valve group 413 communicates with the oil tank 414. When refilling the oil cylinder 401, the third regulating valve group 413 is in a conducting state, so that the oil in the rod cavity of the oil cylinder 401 flows back to the oil tank 414 along the third regulating valve group 413. When refilling the second accumulator 412, the third regulating valve group 413 is in a closed state, so that all the oil output by the oil pump 407 enters the second accumulator 412. When the second accumulator 412 is refilled, due to the presence of the second one-way valve 410, the second accumulator 412 can only refill the rod cavity of the oil cylinder 401, ensuring that the pressure difference between the two ends of the reversing valve 408 tends to be consistent and small.

[0049] It should be known that the specific structure and working principle of the second one-way valve 410 are all well-known technologies to those skilled in the art, so they will not be elaborated in detail here.

[0050] In this embodiment, the specific structures of the first regulating valve group 402, the second regulating valve group 406, and the third regulating valve group 413 are basically the same and there are various types. For the convenience of understanding, one of their structures will be described in detail below. As Figure 2As shown, the first regulating valve group 402, the second regulating valve group 406 and the third regulating valve group 413 all include a control valve 4021 and a cartridge valve 4022. The cartridge valve 4022 is installed in the main circuit, that is, the oil in the oil circuit mainly circulates through the cartridge valve 4022; the control valve 4021 is installed in the main circuit and cooperates with the cartridge valve 4022, and the control valve 4021 mainly controls the opening and closing state of the cartridge valve 4022 through the oil in the main circuit. The specific structure and working principle of the control valve 4021 and the cartridge valve 4022 are well known to those skilled in the art, so they will not be elaborated in detail here.

[0051] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A die casting machine load simulation system, characterized in that: include: Load simulation module; The load simulation module cooperates with the injection end of the injection module to be tested through the load simulation end; Monitoring module; The monitoring module is installed on the shot module to be tested, so as to monitor the actual load force applied to the shot module to be tested; as well as A controller; the controller is respectively connected to the monitoring module and the load simulation module by signal, the controller is suitable for controlling the load simulation module to output a simulated load according to an input load force curve, and the controller is suitable for adjusting the simulated load output by the load simulation module according to the actual load force fed back by the monitoring module; The load simulation module comprises: tank; Oil cylinder; the oil cylinder serves as the load simulation end of the load simulation module through a piston rod; An oil filling circuit; the oil filling circuit is suitable for pre-filling the oil cylinder with the oil in the oil tank until the piston rod is fully extended; and A control circuit; one end of the control circuit is connected to the rodless chamber of the oil cylinder, and the other end is connected to the oil tank; the control circuit is suitable for controlling the return oil pressure of the rodless chamber of the oil cylinder by adjusting the circuit opening during the injection test of the injection module to be tested; The control circuit includes a servo valve, and the servo valve adjusts the return oil pressure of the rodless chamber of the oil cylinder by adjusting the opening; the control circuit also includes a first accumulator and a second regulating valve group; one end of the second regulating valve group is connected to the servo valve, and the other end is connected to the oil tank; the first accumulator is connected in parallel between the servo valve and the second regulating valve group; When a slow-speed injection test of the injection module to be tested is performed, the second regulating valve group is turned on so that the oil in the rodless chamber of the oil cylinder directly flows back to the oil tank; When the rapid injection test of the injection module to be tested is performed, the second regulating valve group is closed to allow the oil in the rodless chamber of the oil cylinder to flow back to the first accumulator.

2. The die casting machine load simulation system according to claim 1, characterized in that: A force obtained by multiplying the oil return back pressure provided by the first accumulator by the cross-sectional area of ​​the rodless chamber of the oil cylinder is less than or equal to a minimum load force required by the injection module to be tested.

3. The die casting machine load simulation system according to claim 1 or 2, characterized in that: The load simulation module comprises a first regulating valve group connected to the rodless chamber of the oil cylinder, and the control circuit and the oil filling circuit are both connected to the rodless chamber of the oil cylinder through the first regulating valve group; The first regulating valve group is fully conducted when the oil cylinder is replenished with oil; The first regulating valve group performs unidirectional conduction when performing slow and fast injection tests on the injection module to be tested; The first regulating valve group is completely closed when performing a pressurization injection test on the injection module to be tested.

4. The die casting machine load simulation system according to claim 3, characterized in that: The load simulation module further includes a first pressure sensor and a second pressure sensor; the first pressure sensor is connected to the rodless chamber of the oil cylinder, and the second pressure sensor is connected to the rod chamber of the oil cylinder; The first pressure sensor and the second pressure sensor are used to monitor the injection force of the injection module to be tested during the pressurized injection test phase.

5. The die casting machine load simulation system according to claim 3, characterized in that: The load simulation module also includes a second accumulator, which is connected to the rod chamber of the cylinder. The second accumulator is suitable for replenishing oil through the oil filling circuit so that the second accumulator continues to replenish oil to the rod chamber during the retreat of the piston rod of the cylinder; the oil filling circuit is suitable for replenishing oil to the cylinder first and then replenishing oil to the second accumulator.

6. The die casting machine load simulation system according to claim 5, characterized in that: The oil filling circuit includes an oil pump, a first one-way valve and a reversing valve; the reversing valve is connected to the first regulating valve group through the first one-way valve, the reversing valve is directly connected to the rod chamber of the oil cylinder, the input end of the oil pump extends to the oil tank, and the output end of the oil pump is connected to the reversing valve; When the oil cylinder is replenished, the reversing valve is in the first position, and the oil in the oil tank, driven by the oil pump, flows into the rodless chamber of the oil cylinder through the reversing valve, the first one-way valve and the first regulating valve group in sequence, and the oil in the rod chamber of the oil cylinder directly flows back to the oil tank; When the second accumulator is replenished with oil, the reversing valve is in the second position, and the oil in the oil tank flows to the second accumulator after passing through the reversing valve under the drive of the oil pump.

7. The die casting machine load simulation system according to claim 6, characterized in that: The oil filling circuit also includes a second one-way valve and a third regulating valve group; the reversing valve is connected to the rod chamber of the oil cylinder through the second one-way valve, one end of the third regulating valve group is connected in parallel between the second one-way valve and the oil cylinder, and the other end of the third regulating valve group is connected to the oil tank; When the oil cylinder is replenished with oil, the third regulating valve group is in an on state; when the second accumulator is replenished with oil, the third regulating valve group is in a closed state.

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