Hydraulic auxiliary system, mold opening and closing device and injection molding machine

Abstract

The utility model provides a hydraulic auxiliary system, a mould opening and closing device and an injection molding machine, an oil supplementing mode and a power assisting mode of the hydraulic auxiliary system are applied to the injection molding machine, the injection molding machine is provided with an oil tank and a mould closing device, and the hydraulic auxiliary system comprises a hydraulic auxiliary oil cylinder, an oil cylinder control valve and a buffer direction valve. According to the hydraulic auxiliary system, the oil supplementing mode and the power assisting mode of the hydraulic auxiliary system are applied to the injection molding machine, and the hydraulic auxiliary oil cylinder provides appropriate power assisting in different working modes by controlling the oil cylinder control valve and the buffering direction valve according to the actual requirements of the injection molding machine. In the power-assisted mode, sufficient hydraulic pressure is provided to support heavy-load operation of the injection molding machine; and in the oil supplementing mode, unnecessary hydraulic energy consumption is reduced, and effective utilization of energy is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding machine technical field especially relates to a hydraulic auxiliary system, open and close mould device and injection molding machine. BACKGROUND

[0002] Injection machine is the core equipment of manufacturing various shape plastic products, and is mainly realized through the processing and forming of thermoplastic or thermosetting material. However, the output tonnage (i.e. the clamping force or injection pressure that the injection molding machine can produce) of the all-electric injection molding machine is insufficient due to factors such as motor performance, structural design or control system in actual application. How to solve the problem of low output tonnage limitation of the all-electric injection molding machine while retaining the energy-saving and efficient advantages of the all-electric injection molding machine is a problem that needs to be solved now. SUMMARY

[0003] The main purpose of the utility model is to provide a hydraulic auxiliary system, open and close mould device and injection molding machine, which aims to solve the problem of low output tonnage limitation of the all-electric injection molding machine while retaining the energy-saving and efficient advantages of the all-electric injection molding machine.

[0004] In view of the above defects, the utility model provides a hydraulic auxiliary system, the oil supplementing mode and the power assisting mode of the hydraulic auxiliary system are applied to an injection molding machine, the injection molding machine has an oil tank and a clamping device, and the hydraulic auxiliary system comprises:

[0005] An oil inlet, which is used for connecting the outlet of the oil tank;

[0006] An oil outlet, which is used for connecting the inlet of the oil tank;

[0007] A hydraulic auxiliary oil cylinder, which has a rodless cavity and a rod cavity that are in communication with each other, and the driving end of the hydraulic auxiliary oil cylinder is used for connecting the clamping device;

[0008] An oil cylinder control valve, which is arranged in series between the oil inlet and the rod cavity of the hydraulic auxiliary oil cylinder;

[0009] A buffer direction valve, which is arranged in series between the oil cylinder control valve and the oil outlet;

[0010] In the oil supplementing mode, the oil cylinder control valve is turned on, the oil inlet and the rod cavity of the hydraulic auxiliary oil cylinder are in communication, so that the rod cavity outputs the hydraulic oil output by the oil inlet to the rodless cavity or the oil inlet and the rodless cavity of the hydraulic auxiliary oil cylinder are in communication, so that the rodless cavity outputs the hydraulic oil output by the oil inlet to the rod cavity, the buffer direction valve is turned on, the oil cylinder control valve and the oil outlet are in communication, so that the hydraulic oil output by the oil cylinder control valve is output to the oil tank after being buffered, and the hydraulic auxiliary oil cylinder stores oil;

[0011] In the assist mode, the oil cylinder control valve is turned on, the buffer direction valve is turned off, the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder are communicated, so that the rodless chamber outputs the hydraulic oil output by the oil inlet to the rod chamber, to provide assist force to the clamping device.

[0012] Optionally, the hydraulic auxiliary system further comprises a controller, the control end of the controller is connected with the controlled end of the oil cylinder control valve and the buffer direction valve; the controller is used for outputting a clamping signal or an opening trigger signal detected when the clamping device opens to a preset position, controlling the oil cylinder control valve and the buffer direction valve to be turned on, so that the hydraulic auxiliary system works in the oil supplementing mode.

[0013] When the clamping signal is received, the controller controls the oil cylinder control valve to be turned on, the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder are communicated, so that the rodless chamber outputs the hydraulic oil output by the oil inlet to the rod chamber, the controller controls the buffer direction valve to be turned on, the oil cylinder control valve and the oil outlet are communicated, so that the hydraulic oil output by the oil cylinder control valve is output to the oil tank after being buffered, to store oil in the hydraulic auxiliary oil cylinder.

[0014] When the opening trigger signal output when the clamping device opens to a preset position is received, the controller controls the oil cylinder control valve to be turned on, the oil inlet and the rod chamber of the hydraulic auxiliary oil cylinder are communicated, so that the rod chamber outputs the hydraulic oil output by the oil inlet to the rodless chamber, the controller controls the buffer direction valve to be turned on, the oil cylinder control valve and the oil outlet are communicated, so that the hydraulic oil output by the oil cylinder control valve is output to the oil tank after being buffered, to store oil in the hydraulic auxiliary oil cylinder.

[0015] The controller is further used for outputting a locking signal, controlling the oil cylinder control valve to be turned on and the buffer direction valve to be turned off, so that the hydraulic auxiliary system works in the assist mode.

[0016] When the locking signal is received, the controller controls the oil cylinder control valve to be turned on and the buffer direction valve to be turned off, the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder are communicated, so that the rodless chamber outputs the hydraulic oil output by the oil inlet to the rod chamber, to provide assist force to the clamping device.

[0017] Optionally, the oil cylinder control valve comprises:

[0018] a first electromagnetic direction valve, the controlled end of the electromagnetic direction valve is connected with the control end of the controller; the first electromagnetic direction valve is used for, when the clamping or locking signal output by the controller is received, controlling the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder to be communicated, so that the rodless chamber outputs the hydraulic oil output by the oil inlet to the rod chamber.

[0019] a second electromagnetic directional valve, a controlled end of the electromagnetic directional valve being connected with a control end of the controller; the second electromagnetic directional valve being used for, when receiving a mold opening trigger signal output by the controller detecting that the mold clamping device opens to a preset position, controlling the oil inlet and a rodless chamber of the hydraulic auxiliary oil cylinder to be communicated, so that the rodless chamber outputs the hydraulic oil output by the oil inlet to the rod chamber;

[0020] When receiving a mold clamping signal, the controller controls the first electromagnetic directional valve and the buffer directional valve to be conducted, the second electromagnetic directional valve to be disconnected, the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder to be communicated, so that the rodless chamber outputs the hydraulic oil output by the oil inlet to the rod chamber, the oil cylinder control valve and the oil outlet to be communicated, so that the hydraulic oil output by the oil cylinder control valve is output to the oil tank after being buffered, so that the hydraulic auxiliary oil cylinder stores oil;

[0021] When receiving a mold clamping signal, the controller controls the first electromagnetic directional valve and the buffer directional valve to be conducted, the second electromagnetic directional valve to be disconnected, the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder to be communicated, so that the rodless chamber outputs the hydraulic oil output by the oil inlet to the rod chamber, the oil cylinder control valve and the oil outlet to be communicated, so that the hydraulic oil output by the oil cylinder control valve is output to the oil tank after being buffered, so that the hydraulic auxiliary oil cylinder stores oil;

[0022] When receiving a mold clamping signal, the controller controls the first electromagnetic directional valve and the buffer directional valve to be conducted, the second electromagnetic directional valve to be disconnected, the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder to be communicated, so that the rodless chamber outputs the hydraulic oil output by the oil inlet to the rod chamber, the oil cylinder control valve and the oil outlet to be communicated, so that the hydraulic oil output by the oil cylinder control valve is output to the oil tank after being buffered, so that the hydraulic auxiliary oil cylinder stores oil.

[0023] Optionally, the hydraulic auxiliary system further comprises a mold breaking mode;

[0024] In the mold breaking mode, the oil cylinder control valve is controlled to be conducted, the buffer directional valve is controlled to be disconnected, the oil inlet and the rod chamber of the hydraulic auxiliary oil cylinder are communicated, so that the rod chamber outputs the hydraulic oil output by the oil inlet to the rodless chamber, and the mold clamping device is provided with assistance;

[0025] The controller is further used for outputting a mold opening signal, controlling the oil cylinder control valve to be conducted and the buffer directional valve to be disconnected, so that the hydraulic auxiliary system works in the mold breaking mode.

[0026] Optionally, the hydraulic auxiliary system further comprises a mold breaking mode;

[0027] In the mold breaking mode, the first electromagnetic directional valve and the buffer directional valve are controlled to be disconnected, the second electromagnetic directional valve is controlled to be turned on, the oil inlet is communicated with the rod cavity of the hydraulic auxiliary oil cylinder, so that the rod cavity outputs the hydraulic oil output by the oil inlet to the rodless cavity, and the mold closing device is provided with assistance;

[0028] The controller is further configured to output an opening mold signal to control the first electromagnetic directional valve and the buffer directional valve to be disconnected, and the second electromagnetic directional valve to be turned on, so that the hydraulic auxiliary system works in the mold breaking mode.

[0029] Optionally, the hydraulic auxiliary system further comprises:

[0030] A hydraulic pump is arranged between the oil tank and the oil inlet; the hydraulic pump is configured to pump out the hydraulic oil in the oil tank;

[0031] A first pressure sensor is arranged in the hydraulic auxiliary oil cylinder; the first pressure sensor is configured to detect the pressure in the hydraulic auxiliary oil cylinder and convert the pressure into a first electric signal output;

[0032] A second pressure sensor is arranged at the oil inlet; the second pressure sensor is configured to detect the pressure at the oil inlet and convert the pressure into a second electric signal output;

[0033] The controller is further configured to receive and control the hydraulic pump according to the first electric signal output by the first pressure sensor and the second electric signal output by the second pressure sensor, so as to control the working speed of the hydraulic pump and the pressure of the hydraulic auxiliary oil cylinder when the hydraulic auxiliary oil cylinder works.

[0034] The utility model further provides a mold opening and closing device, including servo motor, mold closing device, oil tank and hydraulic auxiliary system as above;

[0035] The output shaft of the servo motor is connected to the mold closing device through a transmission mechanism, and the controlled end is electrically connected to the controller; the servo motor is configured to drive the mold closing device to act;

[0036] The output shaft of the hydraulic auxiliary device is connected to the mold closing device; the hydraulic auxiliary system is configured to provide corresponding assistance to the mold closing device according to different working modes.

[0037] Optionally, the controller is further configured to receive and control the hydraulic pump according to the second electric signal output by the second pressure sensor and the torque / speed output of the servo motor, so as to control the working speed of the hydraulic pump.

[0038] Optionally, the mold opening and closing device further comprises a first driver and a second driver, the input ends of the first driver and the second driver are electrically connected to the controller, the output end of the first driver is electrically connected to the servo motor, and the output end of the second driver is electrically connected to the hydraulic pump.

[0039] The utility model also provides an injection molding machine, including the opening and closing mould device of above.

[0040] The utility model discloses hydraulic auxiliary system, and the oil supplementing mode and the power assisting mode of hydraulic auxiliary system are applied to injection molding machine, and according to the actual demand of injection molding machine, through the control of oil cylinder control valve and buffer direction valve, the proper power of hydraulic auxiliary oil cylinder is provided under different working modes. Under the power assisting mode, enough hydraulic pressure is ensured to support the heavy load operation of injection molding machine, and under the oil supplementing mode, the effective use of energy is realized by reducing unnecessary hydraulic energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to the structure shown in these drawings without creative labor.

[0042] Figure 1 It is hydraulic auxiliary system function module schematic diagram of the utility model,

[0043] Figure 2 It is the oil circuit schematic diagram of hydraulic auxiliary system one embodiment of the utility model.

[0044] EXPLANATION OF DRAWINGS

[0045]

[0046] The realization, functional characteristics and advantages of the utility model will be further explained by combining with the embodiments and referring to the drawings. DETAILED DESCRIPTION

[0047] The technical scheme in the embodiments of the utility model will be clearly and completely described below by combining with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only some embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0048] It should be noted that if the directionality indication (such as up, down, left, right, front, back...) is involved in the embodiments of the utility model, the directionality indication is only used to explain the relative position relationship, movement condition and the like between components in a certain specific posture (such as shown in the drawings), and if the specific posture changes, the directionality indication also changes accordingly.

[0049] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel schemes, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0050] The utility model proposes a kind of hydraulic auxiliary system, and the oil supplement mode and boost mode of hydraulic auxiliary system are applied to injection molding machine, and injection molding machine has oil tank and mold clamping device 04, and hydraulic auxiliary system includes:

[0051] Oil inlet, oil inlet is used to connect the outlet of oil tank;

[0052] Oil outlet, oil outlet is used to connect the inlet of oil tank;

[0053] Hydraulic auxiliary oil cylinder 01, hydraulic auxiliary oil cylinder 01 has intercommunication rodless cavity and rod cavity, and the driving end of hydraulic auxiliary oil cylinder 01 is used to connect mold clamping device 04;

[0054] Oil cylinder control valve 02, oil cylinder control valve 02 is connected in series between oil inlet and the rod cavity of hydraulic auxiliary oil cylinder 01;

[0055] Buffer direction valve 03, buffer direction valve 03 is connected in series between oil cylinder control valve 02 and oil outlet;

[0056] In oil supplement mode, oil cylinder control valve 02 is conducted, and oil inlet and the rod cavity of hydraulic auxiliary oil cylinder 01 are communicated, so that the rod cavity exports the hydraulic oil exported by oil inlet to rodless cavity or oil inlet and the rodless cavity of hydraulic auxiliary oil cylinder 01 are communicated, so that the rodless cavity exports the hydraulic oil exported by oil inlet to rod cavity, buffer direction valve 03 is conducted, and oil cylinder control valve 02 and oil outlet are communicated, so that the hydraulic oil exported by oil cylinder control valve 02 is exported to oil tank after buffering, so that hydraulic auxiliary oil cylinder 01 stores oil;

[0057] In boost mode, oil cylinder control valve 02 is conducted, and buffer direction valve 03 is disconnected, and the rodless cavity of control oil inlet and hydraulic auxiliary oil cylinder 01 is communicated, so that the rodless cavity exports the hydraulic oil exported by oil inlet to rod cavity, to provide boost to mold clamping device 04.

[0058] More specifically, during operation, injection molding machines need to inject molten plastic into a mold and apply sufficient pressure to ensure that the plastic fills the mold and forms a good product. This process requires a lot of driving force, and hydraulic systems can provide stable and powerful power output. Hydraulic transmission has the characteristics of large power transmission, easy to obtain large force and torque, which makes the injection molding machine can easily cope with various complex production needs.

[0059] The opening and closing of the mold, injection, pressure holding, cooling and other processes of the injection molding machine require precise motion control. Hydraulic systems have the characteristics of fast response speed and high control accuracy, and can achieve precise control of various actions of the injection molding machine. By adjusting the pressure and flow of the hydraulic system, the speed and position of the injection molding machine can be accurately controlled, thereby ensuring the quality and precision of the product.

[0060] The existing hydraulic transmission equipment can only provide single assistance, which limits the performance and flexibility of the injection molding machine to some extent. The single assistance mode may not fully meet the needs of the injection molding machine under different working conditions, resulting in limited performance. At the same time, the single assistance mode of the hydraulic transmission system makes the injection molding machine lack flexibility when dealing with complex working conditions, and cannot quickly adjust the assistance mode and parameters according to actual needs, affecting production efficiency and product quality. When the servo motor control mold closing device 04 of the injection molding machine closes and locks the mold and opens the mold, the required output tonnage may vary depending on the working conditions. Because the hydraulic transmission equipment can only provide single assistance, the injection molding machine may not be able to fully exert its performance when dealing with complex working conditions. For example, when high tonnage output is required, the hydraulic transmission equipment may not be able to provide sufficient assistance, resulting in a decrease in mold closing speed or a tight mold. When low tonnage output is required, the hydraulic transmission equipment provides too much assistance, resulting in energy waste.

[0061] To solve the above problems, the hydraulic auxiliary system provided by the utility model has two working modes of oil supplementing mode and assistance mode, and the oil supplementing mode and the assistance mode of the hydraulic auxiliary system are applied to the injection molding machine. The injection molding machine has an oil tank and a mold closing device 04. The oil tank can provide hydraulic oil for the hydraulic auxiliary cylinder 01, and the mold closing device 04 can close, lock and open the mold under the assistance of the hydraulic auxiliary system.

[0062] In addition, referring to Figure 1 and Figure 2 , the hydraulic auxiliary system comprises:

[0063] An oil inlet is used to connect the outlet of the oil tank; the hydraulic oil is introduced from the oil tank to the hydraulic auxiliary system. An oil outlet is used to connect the inlet of the oil tank; the pressure oil in the hydraulic system is discharged back to the oil tank.

[0064] Hydraulic auxiliary oil cylinder 01, hydraulic auxiliary oil cylinder 01 has a rodless cavity and a rod cavity in communication with each other, and the driving end of the hydraulic auxiliary oil cylinder 01 is used to connect the mold closing device 04; the hydraulic auxiliary oil cylinder 01 is divided into a rod cavity and a rodless cavity, the rod cavity is a side chamber in the hydraulic auxiliary oil cylinder 01 connected with the piston rod, and the rodless cavity is a side chamber in the hydraulic auxiliary oil cylinder 01 not connected with the piston rod.

[0065] When the hydraulic oil enters the rodless cavity, it will drive the piston of the hydraulic auxiliary oil cylinder 01 to move to the rod cavity direction, so that the mold closing device 04 generates a mold closing action, because the rod cavity and the rodless cavity are communicated, the hydraulic oil of the rodless cavity will flow to the rod cavity. Similarly, when the hydraulic oil enters the rod cavity, it will drive the piston of the hydraulic auxiliary oil cylinder 01 to retract, so that the mold closing device 04 generates a mold opening action, and the hydraulic oil in the rod cavity will flow to the rodless cavity.

[0066] Oil cylinder control valve 02, oil cylinder control valve 02 is connected in series between the oil inlet and the rod cavity of the hydraulic auxiliary oil cylinder 01; the oil cylinder control valve 02 can be composed of an electromagnetic reversing valve and a hydraulic reversing valve, wherein the electromagnetic reversing valve plays a leading role, and the hydraulic reversing valve plays a main valve role, controls the on-off of the oil circuit or changes the flow direction of the oil. The electromagnetic reversing valve mainly plays a leading role in the system. When the electromagnet is powered on, the magnetic core will be attracted up, thereby changing the direction of the magnetic field, so that the hydraulic oil can flow to different oil circuits or chambers. When the electromagnet is powered off, the magnetic core will return to the original state, at which time the direction of the hydraulic oil flow will also change accordingly. The electromagnetic reversing valve generally appears in pairs, one is used to control the extension action of the hydraulic auxiliary oil cylinder 01, and the other is used to control the retraction action of the hydraulic auxiliary oil cylinder 01. By simultaneously controlling the on-off state of the two electromagnetic reversing valves, bidirectional control of the hydraulic auxiliary oil cylinder 01 can be realized.

[0067] Buffer direction valve 03, buffer direction valve 03 is connected in series between oil cylinder control valve 02 and oil outlet; buffer direction valve 03 can shunt the hydraulic oil output by oil cylinder control valve 02 to reduce the pressure of the hydraulic oil in the circuit, so that the hydraulic pressure of the hydraulic auxiliary oil cylinder 01 is reduced, at which time the force of the hydraulic auxiliary oil cylinder 01 driving the mold closing device 04 will be reduced, which will not cause damage to the device, and energy consumption will be reduced.

[0068] In the oil supplementing mode, the oil cylinder control valve 02 is conducted, the oil inlet and the rod cavity of the hydraulic auxiliary oil cylinder 01 are communicated, so that the rod cavity outputs the hydraulic oil output by the oil inlet to the rodless cavity or the oil inlet and the rodless cavity of the hydraulic auxiliary oil cylinder 01 are communicated, so that the rodless cavity outputs the hydraulic oil output by the oil inlet to the rod cavity, the buffer direction valve 03 is conducted, the oil cylinder control valve 02 and the oil outlet are communicated, so that the hydraulic oil output by the oil cylinder control valve 02 is buffered and then output to the oil tank, so that the hydraulic auxiliary oil cylinder 01 stores oil;

[0069] In this mode, there are two cases when the oil cylinder control valve 02 is turned on. One is in the mold closing stage, the oil inlet is connected to the rodless chamber of the hydraulic auxiliary oil cylinder 01, so that the rodless chamber outputs the hydraulic oil from the oil inlet to the rod chamber, and the buffer direction valve 03 is turned on, the oil cylinder control valve 02 is connected to the oil outlet, the hydraulic oil is output through the oil cylinder control valve 02, and then buffered by the buffer direction valve 03 and output to the oil tank. The buffer direction valve 03 shunts the hydraulic oil output by the oil cylinder control valve 02, so as to reduce the pressure of the hydraulic oil in the circuit, reduce the hydraulic pressure of the hydraulic oil in the rodless chamber, and store the oil in the hydraulic auxiliary oil cylinder 01. At this time, the hydraulic auxiliary oil cylinder 01 stores oil, so that the flow speed of the hydraulic oil in the hydraulic auxiliary oil cylinder 01 follows the speed of the servo motor, so as not to be pulled into a vacuum.

[0070] The other is in the mold opening stage. The first stage of the mold opening device 04 needs a large pressure, and the pressure needed after the mold opening to a certain extent will be reduced. The oil inlet is connected to the rod chamber of the hydraulic auxiliary oil cylinder 01, so that the rod chamber outputs the hydraulic oil from the oil inlet to the rodless chamber, and the buffer direction valve 03 is turned on. The oil cylinder control valve 02 is connected to the oil outlet, the hydraulic oil is output through the oil cylinder control valve 02, and then buffered by the buffer direction valve 03 and output to the oil tank, so that the hydraulic pressure of the hydraulic oil in the rod chamber is reduced. At this time, the driving force of the hydraulic auxiliary oil cylinder 01 for opening the mold of the mold opening device 04 is reduced, so as to store the oil in the hydraulic auxiliary oil cylinder 01 and provide sufficient hydraulic power for the next mold closing operation.

[0071] In the power assisting mode, the oil cylinder control valve 02 is turned on and the buffer direction valve 03 is turned off, the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder 01 are connected, so that the rodless chamber outputs the hydraulic oil from the oil inlet to the rod chamber, so as to provide power assistance to the mold closing device 04. In the power assisting mode, it appears in the mold locking stage. The servo motor of the injection molding machine instantaneously accelerates to provide high tonnage output in this stage, and the oil cylinder control valve 02 is turned on to control the connection between the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder 01, so that the rodless chamber outputs the hydraulic oil from the oil inlet to the rod chamber. Because the buffer direction valve 03 is turned off and does not shunt, the hydraulic pressure provided by the hydraulic oil in the hydraulic auxiliary oil cylinder 01 is all supplied to the mold closing device 04. In this process, the hydraulic auxiliary oil cylinder 01 rapidly builds pressure and provides power, thereby reducing the load of the servo motor.

[0072] The hydraulic auxiliary system is applied to the injection molding machine in the oil supplementing mode and the power assisting mode, and according to the actual needs of the injection molding machine, the oil cylinder control valve 02 and the buffer direction valve 03 are controlled to realize that the hydraulic auxiliary oil cylinder 01 provides appropriate power assistance in different working modes. In the power assisting mode, sufficient hydraulic pressure is ensured to support the heavy load operation of the injection molding machine; and in the oil supplementing mode, unnecessary hydraulic energy consumption is reduced to realize effective utilization of energy.

[0073] In an embodiment, the hydraulic auxiliary system further comprises a controller, control ends of the controller being connected with controlled ends of the cylinder control valve 02 and the buffer direction valve 03 respectively; the controller is used for outputting a closing signal or a mold opening trigger signal detected when the mold closing device 04 opens to a preset position, and controlling the cylinder control valve 02 and the buffer direction valve 03 to be turned on so that the hydraulic auxiliary system works in the oil supplementing mode.

[0074] When the closing signal is received, the controller controls the cylinder control valve 02 to be turned on, and the inlet and the rodless chamber of the hydraulic auxiliary cylinder 01 are communicated, so that the rodless chamber outputs the hydraulic oil from the inlet to the rod chamber, and the controller controls the buffer direction valve 03 to be turned on, and the cylinder control valve 02 and the outlet are communicated, so that the hydraulic oil output from the cylinder control valve 02 is output to the tank after being buffered, and the hydraulic auxiliary cylinder 01 stores oil. In the initial state of the hydraulic system, each valve and cylinder is in a closed or inactivated state, when the controller outputs the closing signal, the hydraulic auxiliary system works in the oil supplementing mode, when the cylinder control valve 02 and the buffer direction valve 03 receive the closing signal, the cylinder control valve 02 and the buffer direction valve 03 are turned on, the inlet and the rodless chamber of the hydraulic auxiliary cylinder 01 are communicated, the cylinder control valve 02 and the outlet are communicated, and the hydraulic auxiliary cylinder 01 stores oil.

[0075] The controller is further used for outputting a locking signal, and controlling the cylinder control valve 02 to be turned on and the buffer direction valve 03 to be turned off, so that the hydraulic auxiliary system works in the power assisting mode.

[0076] When the locking signal is received, the controller controls the cylinder control valve 02 to be turned on and the buffer direction valve 03 to be turned off, and the inlet and the rodless chamber of the hydraulic auxiliary cylinder 01 are communicated, so that the rodless chamber outputs the hydraulic oil from the inlet to the rod chamber, to provide power assistance to the mold closing device 04. After the mold closing stage is completed, the controller outputs the locking signal, so that the hydraulic auxiliary system works in the power assisting mode, when the cylinder control valve 02 and the buffer direction valve 03 receive the locking signal, the cylinder control valve 02 is turned on and the buffer direction valve 03 is turned off, the inlet and the rodless chamber of the hydraulic auxiliary cylinder 01 are communicated, and the hydraulic auxiliary system provides power assistance to the mold closing device 04.

[0077] When the controller receives the mold opening trigger signal output by the mold clamping device 04 opening to the preset position, the controller controls the oil cylinder control valve 02 to be turned on, so that the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder 01 are connected, so that the rodless chamber outputs the hydraulic oil output by the oil inlet to the rod chamber, and the controller controls the buffer direction valve 03 to be turned on, so that the oil cylinder control valve 02 and the oil outlet are connected, so that the hydraulic oil output by the oil cylinder control valve 02 is buffered and then output to the oil tank, so that the hydraulic auxiliary oil cylinder 01 stores oil; Because the first stage of the mold clamping device 04 opening requires a larger pressure, and the pressure required after opening to a certain extent will be reduced, when the controller detects the mold opening trigger signal output by the mold clamping device 04 opening to the preset position, the oil cylinder control valve 02 and the buffer direction valve 03 receive the mold opening trigger signal, the oil cylinder control valve 02 and the buffer direction valve 03 are turned on, the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder 01 are connected, the oil cylinder control valve 02 and the oil outlet are connected, and the hydraulic auxiliary oil cylinder 01 stores oil.

[0078] In an embodiment, the oil cylinder control valve 02 comprises:

[0079] The first electromagnetic directional valve 21, the controlled end of the electromagnetic directional valve is connected with the control end of the controller; the first electromagnetic directional valve 21 is used for controlling the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder 01 to be connected when receiving the mold clamping or mold locking signal output by the controller, so that the rodless chamber outputs the hydraulic oil output by the oil inlet to the rod chamber;

[0080] The second electromagnetic directional valve 22, the controlled end of the electromagnetic directional valve is connected with the control end of the controller; the second electromagnetic directional valve 22 is used for controlling the oil inlet and the rod chamber of the hydraulic auxiliary oil cylinder 01 to be connected when receiving the mold opening trigger signal output by the controller detecting that the mold clamping device 04 opens to the preset position, so that the rod chamber outputs the hydraulic oil output by the oil inlet to the rodless chamber;

[0081] In this embodiment, the oil cylinder control valve 02 can be composed of the first electromagnetic directional valve 21, the second electromagnetic directional valve 22 and the hydraulic directional valve, and the electromagnetic directional valve can include a magnetic coil. When the first electromagnetic directional valve 21 receives the mold clamping and mold locking signal output by the controller, that is, the controller energizes the magnetic coil, the electromagnetic directional valve can output the mold clamping and mold locking control signal to the hydraulic directional valve, so that the hydraulic directional valve controls the oil inlet and the rodless chamber of the hydraulic auxiliary oil cylinder 01 to be connected.

[0082] It can be understood that when the first electromagnetic directional valve 21 is turned on, the piston of the hydraulic auxiliary oil cylinder 01 moves forward; when the second electromagnetic directional valve 22 is turned on, the piston of the hydraulic auxiliary oil cylinder 01 is retracted.

[0083] When the second electromagnetic directional valve 22 receives the mold opening signal output by the controller, that is, the controller energizes the magnetic coil, the electromagnetic directional valve can output a mold opening control signal to the hydraulic directional valve, so that the hydraulic directional valve controls the communication between the oil inlet and the rod cavity of the hydraulic auxiliary oil cylinder 01. At this stage, the hydraulic auxiliary oil cylinder 01 stores oil in the forward direction to provide power assistance to the mold clamping device 04.

[0084] When receiving the mold clamping signal, the controller controls the first electromagnetic directional valve 21 to be conductive with the buffer directional valve 03 and the second electromagnetic directional valve 22 to be disconnected, so that the oil inlet and the rodless cavity of the hydraulic auxiliary oil cylinder 01 are communicated. The rodless cavity outputs the hydraulic oil output by the oil inlet to the rod cavity of the oil cylinder control valve 02 and the oil outlet, so that the hydraulic oil output by the oil cylinder control valve 02 is buffered and then output to the oil tank, so that the hydraulic auxiliary oil cylinder 01 stores oil; at this stage, the hydraulic auxiliary oil cylinder 01 stores oil for forward movement preparation.

[0085] When receiving the mold clamping signal, the controller controls the first electromagnetic directional valve 21 to be conductive with the buffer directional valve 03 and the second electromagnetic directional valve 22 to be disconnected, so that the oil inlet and the rodless cavity of the hydraulic auxiliary oil cylinder 01 are communicated. The rodless cavity outputs the hydraulic oil output by the oil inlet to the rod cavity, so as to provide power assistance to the mold clamping device 04. At this stage, the hydraulic auxiliary oil cylinder 01 provides power assistance to the mold clamping device 04 for forward movement.

[0086] When receiving the mold opening trigger signal output by the mold clamping device 04 when the mold is opened to the preset position, the controller controls the first electromagnetic directional valve 21 to be disconnected and the second electromagnetic directional valve 22 and the buffer directional valve 03 to be conductive, so that the oil inlet and the rod cavity of the hydraulic auxiliary oil cylinder 01 are communicated. The rod cavity outputs the hydraulic oil output by the oil inlet to the rodless cavity of the oil cylinder control valve 02 and the oil outlet, so that the hydraulic oil output by the oil cylinder control valve 02 is buffered and then output to the oil tank, so that the hydraulic auxiliary oil cylinder 01 stores oil. At this stage, the hydraulic auxiliary oil cylinder 01 stores oil in the backward direction to provide sufficient hydraulic power for the next mold clamping operation.

[0087] In an embodiment, the hydraulic auxiliary system further comprises a mold breaking mode;

[0088] In the mold breaking mode, the control oil cylinder control valve 02 is conductive, the buffer directional valve 03 is disconnected, the oil inlet and the rod cavity of the hydraulic auxiliary oil cylinder 01 are communicated, so that the rod cavity outputs the hydraulic oil output by the oil inlet to the rodless cavity, so as to provide power assistance to the mold clamping device 04;

[0089] The controller is also used to output a mold opening signal to control the oil cylinder control valve 02 to be conductive and the buffer directional valve 03 to be disconnected, so that the hydraulic auxiliary system works in the mold breaking mode.

[0090] The first stage of the mold breaking mode needs large pressure, and when the controller outputs the mold opening signal, the oil cylinder control valve 02 and the buffer direction valve 03 receive the mold opening signal, the oil cylinder control valve 02 is turned on, the buffer direction valve 03 is turned off, the oil inlet is communicated with the rod cavity of the hydraulic auxiliary oil cylinder 01, and the hydraulic auxiliary oil cylinder 01 provides power for the mold closing device 04.

[0091] In an embodiment, the hydraulic auxiliary system further comprises a mold breaking mode;

[0092] In the mold breaking mode, the first electromagnetic directional valve 21 and the buffer direction valve 03 are controlled to be turned off, the second electromagnetic directional valve 22 is controlled to be turned on, the oil inlet is communicated with the rod cavity of the hydraulic auxiliary oil cylinder 01, so that the rod cavity outputs the hydraulic oil output by the oil inlet to the rodless cavity, and power is provided for the mold closing device 04;

[0093] The controller is further used for outputting a mold opening signal, controlling the first electromagnetic directional valve 21 and the buffer direction valve 03 to be turned off, and controlling the second electromagnetic directional valve 22 to be turned on, so that the hydraulic auxiliary system works in the mold breaking mode. In this stage, the hydraulic auxiliary oil cylinder 01 provides power for the mold closing device 04 in the backward shrinking direction. After the mold breaking mode is completed, the oil supplement mode is entered to store oil. During the oil supplement process, the chamber of the hydraulic auxiliary oil cylinder 01 is gradually filled with hydraulic oil, so as to provide sufficient hydraulic power for the next mold closing operation.

[0094] In an embodiment, the first electromagnetic directional valve 21 is YA3, the second electromagnetic directional valve 22 is YA9, and the buffer direction valve 03 is YA12.

[0095] Firstly, when the mold closing signal is received, YA3 and YA12 are turned on, YA9 is turned off, the oil inlet is communicated with the rodless cavity of the hydraulic auxiliary oil cylinder 01, so that the rodless cavity outputs the hydraulic oil output by the oil inlet to the rod cavity, the oil cylinder control valve 02 and the oil outlet are communicated, so that the hydraulic oil output by the oil cylinder control valve 02 is output to the oil tank after being buffered, and the hydraulic auxiliary oil cylinder 01 stores oil; in this stage, the hydraulic auxiliary oil cylinder 01 stores oil for forward movement preparation.

[0096] Secondly, when the mold locking signal is received, YA3 is turned on, YA9 and YA12 are turned off, the oil inlet is communicated with the rodless cavity of the hydraulic auxiliary oil cylinder 01, so that the rodless cavity outputs the hydraulic oil output by the oil inlet to the rod cavity, so as to provide power for the mold closing device 04. In this stage, the hydraulic auxiliary oil cylinder 01 provides power for the mold closing device 04 for forward movement.

[0097] Thirdly, when the mold opening signal is received, YA3 and YA12 are turned off, YA9 is turned on, the oil inlet is communicated with the rod cavity of the hydraulic auxiliary oil cylinder 01, so that the rod cavity outputs the hydraulic oil output by the oil inlet to the rodless cavity, so as to provide power for the mold closing device 04;

[0098] Finally, when receiving the mold opening trigger signal output by the mold closing device 04 opening to the preset position, YA3 is turned off, YA9 and YA12 are turned on, the oil inlet and the rod cavity of the hydraulic auxiliary oil cylinder 01 are connected, so that the rod cavity outputs the hydraulic oil output by the oil inlet to the rodless cavity of the oil cylinder control valve 02 and the oil outlet, so that the hydraulic oil output by the oil cylinder control valve 02 is buffered and then output to the oil tank, so that the hydraulic auxiliary oil cylinder 01 stores oil. At this stage, the hydraulic auxiliary oil cylinder 01 stores oil in the backward direction, providing sufficient hydraulic power for the next mold closing operation.

[0099] In an embodiment, further comprising:

[0100] A hydraulic pump is arranged between the oil tank and the oil inlet; the hydraulic pump is used to pump out the hydraulic oil in the oil tank; the hydraulic oil in the oil tank is pumped out and delivered to the hydraulic auxiliary oil cylinder 01 through the oil inlet. The working speed of the hydraulic pump determines the flow of the hydraulic oil, which in turn affects the working pressure of the hydraulic auxiliary oil cylinder 01 and the movement speed of the piston.

[0101] A first pressure sensor is arranged in the hydraulic auxiliary oil cylinder 01; the first pressure sensor is used to detect the pressure in the hydraulic auxiliary oil cylinder 01 and convert it into a first electric signal output; the controller monitors the working pressure state of the hydraulic auxiliary oil cylinder 01 in real time. A second pressure sensor is arranged at the oil inlet; the second pressure sensor is used to detect the pressure of the oil inlet and convert it into a second electric signal output; the working state of the hydraulic pump and the flow of the hydraulic oil are monitored.

[0102] The controller is also used to receive and control the signal output by the first pressure sensor and the second pressure sensor to control the working speed of the hydraulic pump, so as to control the pressure of the hydraulic auxiliary oil cylinder 01 during operation. If the working pressure of the hydraulic auxiliary oil cylinder 01 is lower than the preset value, the controller will output a control signal to increase the working speed of the hydraulic pump, so as to increase the flow of the hydraulic oil and the working pressure of the hydraulic auxiliary oil cylinder 01. If the working pressure of the hydraulic auxiliary oil cylinder 01 is higher than the preset value, the controller will output a control signal to reduce the working speed of the hydraulic pump, so as to reduce the flow of the hydraulic oil and the working pressure of the hydraulic auxiliary oil cylinder 01.

[0103] The utility model further proposes a mold opening and closing device, including servo motor, mold closing device 04, oil tank and hydraulic auxiliary system as above;

[0104] The output shaft of the servo motor is connected to the mold closing device 04 through a transmission mechanism, and the controlled end is electrically connected to the controller; the servo motor is used to drive the mold closing device 04 to act; the controller outputs a control signal to the servo motor according to the preset trajectory or speed curve, and the servo motor controls the position, speed and acceleration accurately according to the control signal.

[0105] The hydraulic auxiliary device output shaft is connected with a mold closing device 04; a hydraulic auxiliary system is used to provide corresponding assistance to the mold closing device 04 according to different working modes; the oil cylinder control valve 02 and the buffer direction valve 03 in the hydraulic auxiliary device receive different stage signals and are turned on or turned off to realize different working modes.

[0106] In an embodiment of the mold opening and closing device, the controller is further configured to receive a second electric signal from a second pressure sensor and output a torque / speed control signal of the servo motor to the hydraulic pump according to the second electric signal and the torque / speed of the servo motor, so as to control the working speed of the hydraulic pump.

[0107] In an embodiment of the mold opening and closing device, the mold opening and closing device further comprises a first driver and a second driver, the input ends of the first driver and the second driver are electrically connected to the controller, the output end of the first driver is electrically connected to the servo motor, and the output end of the second driver is electrically connected to the hydraulic pump.

[0108] The controller outputs a control signal to the first driver according to a preset trajectory or speed curve, the first driver receives the control signal from the controller, converts the digital signal of the controller into a current or voltage signal required by the servo motor, and drives the servo motor to perform precise position, speed and acceleration control.

[0109] The controller outputs a control signal to the second driver according to the pressure state in the hydraulic system (detected by the pressure sensor) and the torque / speed of the servo motor, the second driver receives the control signal from the controller, converts the digital signal of the controller into a current or voltage signal required by the servo motor, and drives the servo motor to perform precise position, speed and acceleration control.

[0110] The utility model further provides a kind of injection molding machine, including the mold opening and closing device as described above. The mold opening and closing device includes hydraulic auxiliary system, and the oil supplement mode and the assistance mode of hydraulic auxiliary system are applied to injection molding machine, and according to the actual demand of injection molding machine, by controlling oil cylinder control valve 02 and buffer direction valve 03, realize that hydraulic auxiliary oil cylinder 01 provides appropriate assistance in different working modes. In assistance mode, sufficient hydraulic pressure is ensured to support the heavy load operation of injection molding machine;And in oil supplement mode, unnecessary hydraulic energy consumption is reduced, and effective use of energy is realized.

[0111] The above embodiments are only preferred embodiments of the present application, and do not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which are made by using the content of the present application specification and drawings, are also included in the patent protection scope of the present application.

Claims

1. A hydraulic assist system, characterized by, The oil supplement mode and the assist mode of the hydraulic auxiliary system are applied to an injection molding machine, the injection molding machine has an oil tank and a mold closing device, and the hydraulic auxiliary system comprises: an oil inlet for connecting an outlet of the oil tank; an oil outlet for connecting an inlet of the oil tank; a hydraulic auxiliary oil cylinder having a rodless cavity and a rod cavity in communication with each other, and a driving end of the hydraulic auxiliary oil cylinder being used for connecting the mold closing device; a cylinder control valve being arranged in series between the oil inlet and the rod cavity of the hydraulic auxiliary oil cylinder; a buffer direction valve being arranged in series between the cylinder control valve and the oil outlet; in the oil supplement mode, the cylinder control valve is conducted, the oil inlet and the rod cavity of the hydraulic auxiliary oil cylinder are communicated, so that the rod cavity outputs the hydraulic oil output by the oil inlet to the rodless cavity or the oil inlet and the rodless cavity of the hydraulic auxiliary oil cylinder are communicated, so that the rodless cavity outputs the hydraulic oil output by the oil inlet to the rod cavity, the buffer direction valve is conducted, the cylinder control valve and the oil outlet are communicated, so that the hydraulic oil output by the cylinder control valve is buffered and then output to the oil tank, so that the hydraulic auxiliary oil cylinder stores oil; in the assist mode, the cylinder control valve is conducted and the buffer direction valve is disconnected, the oil inlet and the rodless cavity of the hydraulic auxiliary oil cylinder are controlled to be communicated, so that the rodless cavity outputs the hydraulic oil output by the oil inlet to the rod cavity, so as to provide assist force to the mold closing device.

2. The hydraulic assist system of claim 1, wherein, The hydraulic auxiliary system further comprises a controller, control ends of the controller being connected with controlled ends of the cylinder control valve and the buffer direction valve respectively; the controller is used for outputting a mold closing signal or a mold opening trigger signal detected when the mold closing device is opened to a preset position, controlling the cylinder control valve and the buffer direction valve to be conducted, so that the hydraulic auxiliary system works in the oil supplement mode; when the mold closing signal is received, the controller controls the cylinder control valve to be conducted, the oil inlet and the rodless cavity of the hydraulic auxiliary oil cylinder are communicated, so that the rodless cavity outputs the hydraulic oil output by the oil inlet to the rod cavity, the controller controls the buffer direction valve to be conducted, the cylinder control valve and the oil outlet are communicated, so that the hydraulic oil output by the cylinder control valve is buffered and then output to the oil tank, so that the hydraulic auxiliary oil cylinder stores oil; when the mold opening trigger signal output by the mold closing device when being opened to the preset position is received, the controller controls the cylinder control valve to be conducted, the oil inlet and the rod cavity of the hydraulic auxiliary oil cylinder are communicated, so that the rod cavity outputs the hydraulic oil output by the oil inlet to the rodless cavity, the controller controls the buffer direction valve to be conducted, the cylinder control valve and the oil outlet are communicated, so that the hydraulic oil output by the cylinder control valve is buffered and then output to the oil tank, so that the hydraulic auxiliary oil cylinder stores oil; the controller is further used for outputting a mold locking signal, controlling the cylinder control valve to be conducted and the buffer direction valve to be disconnected, so that the hydraulic auxiliary system works in the assist mode; When receiving the locking signal, the controller controls the oil cylinder control valve to be turned on, the buffer direction valve to be turned off, the inlet and the rodless chamber of the hydraulic auxiliary oil cylinder to be communicated, so that the rodless chamber outputs the hydraulic oil output by the inlet to the rod chamber, to provide assistance to the mold closing device.

3. The hydraulic assistance system of claim 2, wherein, The oil cylinder control valve comprises: a first electromagnetic directional valve, a controlled end of the electromagnetic directional valve being connected with a control end of the controller, the first electromagnetic directional valve being used to control the inlet and the rodless chamber of the hydraulic auxiliary oil cylinder to be communicated when receiving the mold closing signal output by the controller, so that the rodless chamber outputs the hydraulic oil output by the inlet to the rod chamber; a second electromagnetic directional valve, a controlled end of the electromagnetic directional valve being connected with a control end of the controller, the second electromagnetic directional valve being used to control the inlet and the rod chamber of the hydraulic auxiliary oil cylinder to be communicated when receiving the mold opening trigger signal output by the controller when detecting that the mold closing device is opened to a preset position, so that the rod chamber outputs the hydraulic oil output by the inlet to the rodless chamber; When receiving the mold closing signal, the controller controls the first electromagnetic directional valve and the buffer direction valve to be turned on, the second electromagnetic directional valve to be turned off, the inlet and the rodless chamber of the hydraulic auxiliary oil cylinder to be communicated, so that the rodless chamber outputs the hydraulic oil output by the inlet to the rod chamber, the oil cylinder control valve and the oil outlet are communicated, so that the hydraulic oil output by the oil cylinder control valve is output to the oil tank after being buffered, and the hydraulic auxiliary oil cylinder stores oil. When receiving the locking signal, the controller controls the first electromagnetic directional valve to be turned on, the second electromagnetic directional valve and the buffer direction valve to be turned off, the inlet and the rodless chamber of the hydraulic auxiliary oil cylinder to be communicated, so that the rodless chamber outputs the hydraulic oil output by the inlet to the rod chamber, to provide assistance to the mold closing device. When receiving the mold opening trigger signal output by the mold closing device when being opened to a preset position, the controller controls the first electromagnetic directional valve to be turned off, the second electromagnetic directional valve and the buffer direction valve to be turned on, the inlet and the rod chamber of the hydraulic auxiliary oil cylinder to be communicated, so that the rod chamber outputs the hydraulic oil output by the inlet to the rodless chamber, the oil cylinder control valve and the oil outlet are communicated, so that the hydraulic oil output by the oil cylinder control valve is output to the oil tank after being buffered, and the hydraulic auxiliary oil cylinder stores oil.

4. The hydraulic assistance system of claim 2, wherein, The hydraulic auxiliary system further comprises a mold breaking mode; In the mold breaking mode, the oil cylinder control valve is turned on, the buffer direction valve is turned off, the inlet and the rod chamber of the hydraulic auxiliary oil cylinder are communicated, so that the rod chamber outputs the hydraulic oil output by the inlet to the rodless chamber, to provide assistance to the mold closing device. The controller is further used to output a mold opening signal, control the oil cylinder control valve to be turned on, and the buffer direction valve to be turned off, so that the hydraulic auxiliary system works in the mold breaking mode.

5. The hydraulic assistance system of claim 3, wherein, The hydraulic auxiliary system further comprises a mold breaking mode; In the mold breaking mode, the first electromagnetic directional valve and the buffer directional valve are controlled to be disconnected, the second electromagnetic directional valve is controlled to be turned on, the oil inlet is communicated with the rod cavity of the hydraulic auxiliary oil cylinder, so that the rod cavity outputs the hydraulic oil output by the oil inlet to the rodless cavity, to provide assistance to the mold clamping device; The controller is further configured to output a mold opening signal, control the first electromagnetic directional valve and the buffer directional valve to be disconnected, and control the second electromagnetic directional valve to be turned on, so that the hydraulic auxiliary system works in the mold breaking mode.

6. The hydraulic assistance system of claim 2, wherein, Further comprising: A hydraulic pump is arranged between the oil tank and the oil inlet; the hydraulic pump is configured to pump out the hydraulic oil in the oil tank; A first pressure sensor is arranged in the hydraulic auxiliary oil cylinder; the first pressure sensor is configured to detect the pressure in the hydraulic auxiliary oil cylinder and convert it into a first electric signal output; A second pressure sensor is arranged at the oil inlet; the second pressure sensor is configured to detect the pressure at the oil inlet and convert it into a second electric signal output; The controller is further configured to receive and control the hydraulic pump according to the first electric signal output by the first pressure sensor and the second electric signal output by the second pressure sensor, to control the working speed of the hydraulic pump and the pressure of the hydraulic auxiliary oil cylinder when working.

7. A die set comprising: The hydraulic auxiliary system comprises a servo motor, a mold clamping device, an oil tank and the hydraulic auxiliary system according to any one of claims 1-6. The output shaft of the servo motor is connected to the mold clamping device through a transmission mechanism, and the controlled end is electrically connected to the controller; the servo motor is configured to drive the mold clamping device to act. The output shaft of the hydraulic auxiliary system is connected to the mold clamping device; the hydraulic auxiliary system is configured to provide corresponding assistance to the mold clamping device according to different working modes.

8. The opening and closing mold device according to claim 7, wherein The controller is further configured to receive and control the hydraulic pump according to the second electric signal output by the second pressure sensor and the torque / speed output of the servo motor, to control the working speed of the hydraulic pump.

9. The opening and closing mold device according to claim 7, wherein The mold clamping device further comprises a first driver and a second driver, the input ends of the first driver and the second driver are electrically connected to the controller, the output end of the first driver is electrically connected to the servo motor, and the output end of the second driver is electrically connected to the hydraulic pump.

10. An injection molding machine characterized by, The mold clamping device comprises the mold clamping device according to any one of claims 7-9. The mold clamping device comprises the mold clamping device according to any one of claims 7-9.

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