Hydraulic turntable system and injection molding machine

Abstract

The utility model discloses a hydraulic turntable system and an injection molding machine. According to the system, the first end of a direction valve is connected with the first connecting end of a rotary disc driving module, the second end of the direction valve is connected with the second connecting end of the rotary disc driving module, the third end of the direction valve is connected with an oil supply module, and the fourth end of the direction valve is connected with an oil return pipeline; the turntable position acquisition module is used for detecting the position information of the turntable in real time, converting the position information of the turntable into a turntable position signal and transmitting the turntable position signal to the control module, and the control module is used for receiving a set turntable rotation signal, controlling the oil supply module and the direction valve to open to drive the turntable to rotate and receiving the turntable position signal at the same time; and the opening degree of the proportional valve and the oil supply amount and oil supply pressure of the oil supply module are controlled to be reduced, so that the turntable driving module drives the turntable to stably decelerate until the turntable stops. According to the hydraulic turntable system, the impact when the turntable stops is reduced, the failure rate of the hydraulic turntable system is reduced, and the service life of the hydraulic turntable system is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic turntable technology, and in particular to a hydraulic turntable system and an injection molding machine. Background Technology

[0002] With the rapid development of economic construction, the market demand for injection molding machines with hydraulic rotary table systems is increasing day by day.

[0003] In existing hydraulic turntable systems, servo motors are generally used to directly drive the turntable to rotate. However, during the process of the servo motor controlling the turntable to stop, the large inertia of the turntable results in a large impact, which can easily damage the hydraulic turntable system. Utility Model Content

[0004] This invention provides a hydraulic turntable system and an injection molding machine to reduce the impact when the turntable stops, reduce the failure rate of the hydraulic turntable system, and extend the service life of the hydraulic turntable system.

[0005] According to one aspect of the present invention, a hydraulic turntable system is provided, the hydraulic turntable system comprising:

[0006] Turntable, turntable drive module, directional valve, proportional valve, oil supply module, turntable position acquisition module, and control module;

[0007] The first end of the directional valve is connected to the first connection end of the turntable drive module, the second end of the directional valve is connected to the second connection end of the turntable drive module, the third end of the directional valve is connected to the oil supply module, the fourth end of the directional valve is connected to the return oil pipeline, and the proportional valve is set on the return oil pipeline.

[0008] The turntable position acquisition module is electrically connected to the control module. The turntable position acquisition module is used to detect the position information of the turntable in real time and convert the position information into a turntable position signal, which is then transmitted to the control module. The control module is electrically connected to the directional valve, the proportional valve, and the oil supply module. The control module is used to receive the set turntable rotation signal, control the oil supply module and the directional valve to open and operate, thereby driving the turntable to rotate. At the same time, it receives the turntable position signal and controls the reduction of the opening of the proportional valve and the oil supply quantity and pressure of the oil supply module, so that the turntable can be driven by the turntable drive module to decelerate smoothly until the turntable stops. The turntable rotation signal includes the turntable rotation direction signal and the turntable rotation position signal.

[0009] Furthermore, the hydraulic turntable system also includes:

[0010] First pressure sensor;

[0011] The first pressure sensor is located between the fourth end of the directional valve and the proportional valve. The first pressure sensor is used to obtain the return oil pressure at the outlet position of the fourth end of the directional valve in real time and convert the return oil pressure into a return oil pressure signal and transmit it to the control module.

[0012] The control module is used for:

[0013] Receives the turntable rotation position signal and outputs the first braking position signal and the target position signal;

[0014] When the turntable position signal is equal to the first brake position signal, control to reduce the opening of the proportional valve;

[0015] When the return oil pressure signal is greater than or equal to the preset return oil pressure signal, the control proportional valve maintains its current opening, and the control oil supply module gradually reduces the oil supply quantity and oil supply pressure according to the first oil supply threshold until the turntable reaches the target position.

[0016] Furthermore, the control module is also used for:

[0017] When the turntable position signal equals the target position signal, the control oil supply module stops working.

[0018] Furthermore, the hydraulic turntable system also includes:

[0019] Return oil solenoid valve;

[0020] The first end of the return oil solenoid valve is connected to the first end of the directional valve through the first return oil branch, the first end of the return oil solenoid valve is connected to the second end of the directional valve through the second return oil branch, and the second end of the return oil solenoid valve is connected to the return oil pipeline through the third return oil branch. The connection end of the third return oil branch and the return oil pipeline is located on the side of the proportional valve away from the directional valve.

[0021] The control module is used to control the directional valve to close and the return oil solenoid valve to open when the turntable position signal equals the target position signal.

[0022] Furthermore, the turntable drive module includes two hydraulic motors;

[0023] Two hydraulic motors are arranged opposite each other on both sides of the turntable. The first end of the directional valve is connected to the first connection end of the two hydraulic motors, and the second end of the directional valve is connected to the second connection end of the two hydraulic motors.

[0024] Furthermore, the hydraulic turntable system also includes:

[0025] Fuel tank; the fourth end of the directional valve is connected to the oil inlet of the fuel tank via a return oil line;

[0026] The fuel supply module includes:

[0027] High-pressure oil pump and servo drive module; the high-pressure oil pump is located between the oil outlet of the oil tank and the third end of the directional valve; the first end of the servo drive module is electrically connected to the high-pressure oil pump, and the second end of the servo drive module is electrically connected to the control module.

[0028] The control module is used to control the directional valve to open based on the turntable rotation signal, and to control the servo drive module to drive the high-pressure oil pump to operate, and to control the directional valve to open to drive the turntable to rotate.

[0029] It receives the turntable position signal and controls the reduction of the proportional valve opening and the output pressure of the servo drive module to drive the turntable to decelerate smoothly until the turntable stops.

[0030] Furthermore, the fuel supply module also includes:

[0031] Second pressure sensor;

[0032] The second pressure sensor is electrically connected to the servo drive module. The second pressure sensor is used to detect the pump outlet output pressure of the high-pressure oil pump in real time and convert the pump outlet output pressure into a pump outlet output pressure signal and transmit it to the servo drive module. The servo drive module is used to control the pump outlet output pressure of the high-pressure oil pump to stabilize to the preset output pressure when the pump outlet output pressure signal is equal to the preset output pressure signal, until the turntable stops rotating.

[0033] Furthermore, the hydraulic turntable system also includes:

[0034] Oil suction filter;

[0035] An oil suction filter is installed between the high-pressure oil pump and the oil outlet of the oil tank.

[0036] Furthermore, the turntable position acquisition module includes a position encoder.

[0037] According to another aspect of the present invention, an injection molding machine is provided, the injection molding machine including a machine body and a hydraulic rotary table system as described in any of the above embodiments.

[0038] The hydraulic turntable system provided in this embodiment controls the oil supply module and directional valve to open and operate according to the received turntable rotation signal, thereby driving the turntable to rotate. It also controls the reduction of the proportional valve opening and the oil supply quantity and pressure of the oil supply module according to the received turntable position signal, gradually reducing the pressure difference between the hydraulic oil pressure at the third and fourth ends of the directional valve. This achieves smooth deceleration of the turntable driven by the turntable drive module until the turntable stops. Compared with the prior art where the turntable is directly controlled by a servo motor, this reduces the impact when the turntable stops, thereby reducing the failure rate of the hydraulic turntable system and extending its service life.

[0039] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of a hydraulic turntable system according to an embodiment of the present utility model;

[0042] Figure 2 This is a schematic diagram of partial circuit connections within a control module according to an embodiment of the present utility model;

[0043] Figure 3 This is a partial circuit connection diagram within another control module provided according to an embodiment of the present utility model;

[0044] Figure 4 This is a partial circuit connection diagram within a control module according to an embodiment of the present utility model;

[0045] Figure 5 This is a schematic diagram of another hydraulic turntable system provided according to an embodiment of the present utility model;

[0046] Figure 6 This is a partial circuit connection diagram within a control module provided according to an embodiment of the present utility model. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0049] This utility model provides a hydraulic turntable system. Figure 1 This is a structural schematic diagram of a hydraulic turntable system according to an embodiment of the present utility model, with reference to... Figure 1 The hydraulic turntable system includes:

[0050] Turntable 1, turntable drive module 2, directional valve 3, proportional valve 4, oil supply module 5, turntable position acquisition module 6, and control module;

[0051] The first end of the directional valve 3 is connected to the first connection end of the turntable drive module 2, the second end of the directional valve 3 is connected to the second connection end of the turntable drive module 2, the third end of the directional valve 3 is connected to the oil supply module 5, the fourth end of the directional valve 3 is connected to the return oil line 31, and the proportional valve 4 is installed on the return oil line 31.

[0052] The turntable position acquisition module 6 is electrically connected to the control module. The turntable position acquisition module 6 is used to detect the position information of the turntable 1 in real time and convert the position information of the turntable 1 into a turntable position signal and transmit it to the control module. The control module is electrically connected to the directional valve 3, the proportional valve 4 and the oil supply module 5. The control module is used to receive the set turntable rotation signal, control the oil supply module 5 and the directional valve 3 to open and work, so as to drive the turntable 1 to rotate. At the same time, it receives the turntable position signal and controls the reduction of the opening of the proportional valve 4 and the oil supply quantity and oil supply pressure of the oil supply module 5, so as to drive the turntable 1 to decelerate smoothly through the turntable drive module 2 until the turntable stops. The turntable rotation signal includes the turntable rotation direction signal and the turntable rotation position signal.

[0053] Specifically, before controlling the rotation of turntable 1, the operator can set the turntable rotation signal in the control module according to actual needs. The turntable rotation signal may include the turntable rotation direction signal, the turntable rotation position signal, and the turntable rotation speed signal, etc., and this embodiment of the invention does not limit this. After receiving the set turntable rotation signal, the control module controls the oil supply module 5's oil supply quantity and pressure, as well as the connection status of different ports in the directional valve 3, to drive the turntable 1 to rotate. For example, if the set turntable rotation speed is large, the oil supply module 5 outputs a larger oil supply quantity and pressure; if the set turntable rotation speed is small, the oil supply module 5 outputs a smaller oil supply quantity and pressure.

[0054] If it is necessary to control the turntable 1 to rotate clockwise, the first end A and the third end P of the directional valve 3 can be connected, and the second end B and the fourth end T of the directional valve 3 can be connected, so that the hydraulic oil output by the oil supply module 5 can be transmitted to the turntable drive module 2 through the first end A and the third end P of the directional valve 3, so that the turntable 1 can be driven to rotate clockwise by the turntable drive module 2. At this time, the hydraulic oil flowing into the turntable drive module 2 flows out from the second end of the turntable drive module 2 through the second end B and the fourth end T of the directional valve 3.

[0055] If it is necessary to control the turntable 1 to rotate counterclockwise, the second end B and the third end P of the directional valve 3 can be connected, and the first end A and the fourth end T of the directional valve 3 can be connected, so that the hydraulic oil output by the oil supply module 5 can be transmitted to the turntable drive module 2 through the second end B and the third end P of the directional valve 3, so that the turntable 1 can be driven to rotate counterclockwise by the turntable drive module 2. At this time, the hydraulic oil flowing into the turntable drive module 2 flows out from the second end of the turntable drive module 2 through the first end A and the fourth end T of the directional valve 3.

[0056] After the drive turntable 1 rotates, the real-time detected turntable position signal is compared with the turntable rotation position in the turntable rotation signal. When the position of turntable 1 is close to the turntable rotation position set in the turntable rotation signal, the opening of proportional valve 4 and the oil supply quantity and oil supply pressure of oil supply module 5 are controlled to gradually reduce the pressure difference between the hydraulic oil pressure at the third end T position of directional valve 3 and the hydraulic oil pressure at the fourth end T position of directional valve 3, thereby realizing the smooth deceleration of the turntable until the turntable stops. For example, when the position of turntable 1 is close to the turntable rotation position set in the turntable rotation signal, the proportional valve 4 can be controlled to reduce the first opening threshold, or the opening of proportional valve 4 can be controlled to gradually decrease.

[0057] The hydraulic turntable system provided in this embodiment controls the oil supply module 5 and the directional valve 3 to open and operate according to the received turntable rotation signal, thereby driving the turntable 1 to rotate. It also controls the reduction of the opening degree of the proportional valve 4 and the oil supply quantity and pressure of the oil supply module 5 according to the received turntable position signal, gradually reducing the pressure difference between the hydraulic oil pressure at the third end T position and the hydraulic oil pressure at the fourth end T position of the directional valve 3. This achieves smooth deceleration of the turntable 1 driven by the turntable drive module 2 until the turntable stops. Compared with the prior art where the turntable 1 is directly controlled by a servo motor, this reduces the impact when the turntable 1 stops, thereby reducing the failure rate of the hydraulic turntable system and extending its service life.

[0058] Furthermore, Figure 2 This is a schematic diagram of partial circuit connections within a control module according to an embodiment of the present invention. Figure 3 This is a partial circuit connection diagram of another control module provided according to an embodiment of the present utility model, for reference. Figures 1-3 The hydraulic turntable system also includes:

[0059] First pressure sensor PT2;

[0060] The first pressure sensor PT2 is located between the fourth end of the directional valve 3 and the proportional valve 4. The first pressure sensor PT2 is used to obtain the return oil pressure at the outlet position of the fourth end of the directional valve 3 in real time and convert the return oil pressure into a return oil pressure signal and transmit it to the control module.

[0061] The control module is used for:

[0062] Receives the turntable rotation position signal and outputs the first braking position signal and the target position signal;

[0063] When the turntable position signal is equal to the first brake position signal, the opening of the proportional valve 4 is reduced so that the turntable 1 is driven into the deceleration state through the turntable drive module 2.

[0064] When the return oil pressure signal is greater than or equal to the preset return oil pressure signal, the proportional valve 4 is controlled to maintain its current opening, and the oil supply module 5 is controlled to gradually reduce the oil supply quantity and oil supply pressure according to the first oil supply threshold until the turntable 1 reaches the target position.

[0065] In this context, controlling the proportional valve 4 to maintain its current opening degree can be understood as controlling the proportional valve 4 to maintain the opening degree when the return oil pressure signal is greater than or equal to the preset return oil pressure signal.

[0066] Specifically, the control module can first determine the target position of turntable 1 based on the turntable rotation position signal in the turntable rotation signal, and then determine the first braking position based on the target position, that is, the position at which turntable 1 begins to enter the deceleration state, and output the first braking position signal and the target position signal. When the turntable position signal is equal to the first braking position signal, the opening of the proportional valve 4 is reduced, for example, as shown in the example. Figure 2 As shown, the control module includes a first comparator P1 and a first voltage converter Q1. The first input of the first comparator P1 receives a turntable position signal, and the second input receives a first brake position signal. After receiving the turntable position signal and the first brake position signal, the first comparator P1 compares the turntable position signal with the first brake position signal and outputs a corresponding position signal to the first voltage converter Q1 based on the comparison result. For example, if the turntable position signal equals the first brake position signal, the first comparator P1 outputs the first brake position signal to the first voltage converter Q1; if the turntable position signal is less than the first brake position signal, the first comparator P1 outputs the turntable position signal to the first voltage converter Q1. After receiving the corresponding position signal, the first voltage converter Q1 converts the corresponding position signal into a digital signal. For example, when the first voltage converter Q1 receives the first brake position signal, it outputs a first low-level signal to the proportional valve 4. Upon receiving the first low-level signal, the proportional valve 4 reduces its opening. At this time, the return oil pressure at the fourth end of the directional valve 3 gradually increases. When the return oil pressure signal detected by the first pressure sensor PT2 is greater than or equal to the preset return oil pressure signal, under the current opening degree of the proportional valve 1, the oil supply module 5 is controlled to gradually reduce the oil supply quantity and oil supply pressure according to the first oil supply threshold. For example, as shown in the example... Figure 3As shown, the control module also includes a second comparator p2 and a second voltage converter q2. The first input terminal of the second comparator p2 is used to receive the return oil pressure signal, and the second input terminal of the second comparator p2 is used to receive the preset return oil pressure signal. After receiving the return oil pressure signal and the preset return oil pressure signal, the second comparator p2 compares the return oil pressure signal with the preset return oil pressure signal and outputs the corresponding pressure signal to the second voltage converter q2 according to the comparison result. For example, if the return oil pressure signal is greater than or equal to the preset return oil pressure signal, the second comparator p2 outputs the return oil pressure signal to the second voltage converter q2; if the return oil pressure signal is less than the preset return oil pressure signal, the second comparator p2 outputs the preset return oil pressure signal to the second voltage converter q2. After the second voltage converter q2 receives the corresponding return oil pressure signal, it converts the return oil pressure signal into a digital signal. For example, when the first voltage converter q1 receives the return oil pressure signal, it outputs a first high-level signal to the proportional valve 4 and a second high-level signal to the oil supply module 5. After receiving the first high-level signal, the proportional valve 4 maintains its current opening. After receiving the second high-level signal, the oil supply module 5 gradually reduces the oil supply quantity and oil supply pressure according to the first oil supply threshold. While reducing the return oil pressure at the fourth end of the directional valve 3, it also reduces the pressure difference between the hydraulic oil pressure at the third end T of the directional valve 3 and the hydraulic oil pressure at the fourth end T of the directional valve 3. This allows the turntable 1 to be driven smoothly to decelerate through the turntable drive module 2 until the turntable stops, and the turntable can stop at any angle. The preset return oil pressure signal, the first opening threshold, and the first oil supply threshold can be set according to the actual situation.

[0067] Furthermore, Figure 4 This is a partial circuit connection diagram of a control module according to another embodiment of the present utility model, with reference to... Figure 1 and Figure 4 The control module is also used for:

[0068] When the turntable position signal equals the target position signal, control the oil supply module 5 to stop working.

[0069] Specifically, after turntable 1 reaches the target position, the control process of turntable 1 is considered complete. At this point, the oil supply module 5 needs to be stopped. For example, the control module also includes a third comparator P3 and a third voltage converter Q3. The first input of the third comparator P3 receives the turntable position signal, and the second input receives the target position signal. After receiving the turntable position signal and the target position signal, the third comparator P3 compares the turntable position signal with the target position signal and outputs the corresponding position signal to the third voltage converter Q3 based on the comparison result. For example, if the turntable position signal equals the target position signal, the third comparator P3 outputs the target position signal to the third voltage converter Q3; if the turntable position signal is less than the target position signal, the third comparator P3 outputs the turntable position signal to the third voltage converter Q3. After receiving the corresponding position signal, the third voltage converter Q3 converts the corresponding position signal into a digital signal. For example, when the third voltage converter Q3 receives the target position signal, it outputs a second low-level signal to the oil supply module 5. The oil supply module 5 stops working after receiving the second low-level signal.

[0070] Further reference Figure 1 and Figure 4 The hydraulic turntable system also includes:

[0071] Return oil solenoid valve 7;

[0072] The first end of the return oil solenoid valve 7 is connected to the first end of the directional valve 3 through the first return oil branch 71, the first end of the return oil solenoid valve 7 is connected to the second end of the directional valve 3 through the second return oil branch 72, the second end of the return oil solenoid valve 7 is connected to the return oil pipeline 31 through the third return oil branch 73, and the connection end of the third return oil branch 73 and the return oil pipeline 31 is located on the side of the proportional valve 4 away from the directional valve 3.

[0073] The control module is used to control the directional valve 3 to close and the return oil solenoid valve 7 to open when the turntable position signal is equal to the target position signal.

[0074] Specifically, after turntable 1 reaches the target position, the control process of turntable 1 is completed. At this time, it is necessary to control the return oil solenoid valve 7 to open and operate, so that the hydraulic oil entering the turntable drive module 2 can be returned through the return oil solenoid valve 7. For example, if the turntable position signal is equal to the target position signal, the third comparator p3 outputs the target position signal to the third voltage converter q3. When the third voltage converter q3 receives the target position signal, it outputs a third low-level signal to the directional valve 3 and a fourth low-level signal to the return oil solenoid valve 7. After receiving the third low-level signal, the directional valve 3 closes the valve, and after receiving the fourth low-level signal, the return oil solenoid valve 7 opens and operates.

[0075] Furthermore, Figure 5 This is a schematic diagram of another hydraulic rotary table system provided according to an embodiment of the present utility model, with reference to... Figure 2 The turntable drive module includes two hydraulic motors 21;

[0076] Two hydraulic motors 21 are arranged opposite each other on both sides of the turntable 1. The first end of the directional valve 3 is connected to the first connection end B of the two hydraulic motors 21, and the second end of the directional valve 3 is connected to the second connection end A of the two hydraulic motors 21.

[0077] For example, if it is necessary to control the turntable 1 to rotate clockwise, the first end A and the third end P of the directional valve 3 can be connected, and the second end B and the fourth end T of the directional valve 3 can be connected, so that the hydraulic oil output by the oil supply module 5 flows into the hydraulic motor 21 through the first end A and the third end P of the directional valve 3 from the first connection end B of the hydraulic motor 21, so that the turntable 1 can be driven to rotate clockwise by the two hydraulic motors 21. At this time, the hydraulic oil flowing into the hydraulic motor 21 flows out through the second connection end A of the hydraulic motor 21 and the second end B and the fourth end T of the directional valve 3.

[0078] If it is necessary to control the turntable 1 to rotate counterclockwise, the second end B and the third end P of the directional valve 3 can be connected, and the first end A and the fourth end T of the directional valve 3 can be connected, so that the hydraulic oil output by the oil supply module 5 flows into the hydraulic motor 21 through the second end B and the third end P of the directional valve 3 and the second connection end A of the hydraulic motor 21, so that the turntable 1 can be driven to rotate counterclockwise by the two hydraulic motors 21. At this time, the hydraulic oil flowing into the hydraulic motor 21 flows out through the first connection end B of the hydraulic motor 21 and the first end A and the fourth end T of the directional valve 3.

[0079] Further reference Figure 1 The hydraulic turntable system also includes:

[0080] Oil tank 8; the fourth end of directional valve 3 is connected to the oil inlet of oil tank 8 through return oil pipeline 31;

[0081] Oil supply module 5 includes:

[0082] High-pressure oil pump 51 and servo drive module 52; high-pressure oil pump 51 is located between the oil outlet of oil tank 8 and the third end of directional valve 3; the first end of servo drive module 52 is electrically connected to high-pressure oil pump 51, and the second end of servo drive module 52 is electrically connected to control module.

[0083] The control module is used to control the directional valve 3 to open and operate according to the turntable rotation signal, and to control the servo drive module 52 to drive the high-pressure oil pump 51 to operate, and to control the directional valve 3 to open and operate, so as to drive the turntable 1 to rotate.

[0084] It receives the turntable position signal and controls the reduction of the opening of the proportional valve 4 and the output pressure of the servo drive module 52, so as to drive the turntable 1 to decelerate smoothly through the turntable drive module 2 until the turntable stops.

[0085] Specifically, after receiving the set turntable rotation signal, the control module controls the servo drive module 52 to drive the high-pressure oil pump 51 and the connection status of different ports in the directional valve 3 to drive the turntable 1 to rotate. After the turntable 1 rotates, the real-time detected turntable position signal is compared with the turntable rotation position signal in the turntable rotation signal. When the position of the turntable 1 approaches the turntable rotation position set in the turntable rotation signal, the opening degree of the proportional valve 4 and the output pressure of the servo drive module 52 are reduced to gradually reduce the pressure difference between the hydraulic oil pressure at the third end T position and the hydraulic oil pressure at the fourth end T position of the directional valve 3, thereby achieving smooth deceleration of the turntable until it stops. The servo drive module includes a servo motor.

[0086] Furthermore, Figure 6 This is a partial circuit connection diagram of a control module provided according to an embodiment of the present invention. (Continuing to refer to...) Figure 1 and Figure 6 The oil supply module 5 also includes:

[0087] Second pressure sensor PT1;

[0088] The second pressure sensor PT1 is electrically connected to the servo drive module 52. The second pressure sensor PT1 is used to detect the pump outlet output pressure of the high-pressure oil pump 51 in real time and convert the pump outlet output pressure into a pump outlet output pressure signal and transmit it to the servo drive module 52. The servo drive module 52 is used to control the pump outlet output pressure of the high-pressure oil pump 51 to stabilize to the preset output pressure when the pump outlet output pressure signal is equal to the preset output pressure signal, until the turntable 1 stops rotating.

[0089] Specifically, when the output pressure signal at the pump port equals the preset output pressure signal, the servo drive module 52 enters the pressure control loop for automatic control, so that the output pressure at the pump port of the high-pressure oil pump 51 stabilizes to the preset output pressure until the turntable 1 stops rotating. For example, Figure 6As shown, the control module includes a fourth comparator P4 and a fourth voltage converter Q4. The first input of the fourth comparator P4 is used to receive the pump outlet output pressure signal, and the second input of the fourth comparator P4 is used to receive a preset output pressure signal. After receiving the pump outlet output pressure signal and the preset output pressure signal, the fourth comparator P4 compares the pump outlet output pressure signal with the preset output pressure signal and outputs the corresponding pressure signal to the fourth voltage converter Q4 according to the comparison result. For example, if the pump outlet output pressure signal is equal to the preset output pressure signal, the fourth comparator P4 outputs the preset output pressure signal to the fourth voltage converter Q4; if the pump outlet output pressure signal is greater than the preset output pressure signal, the fourth comparator P4 outputs the pump outlet output pressure signal to the fourth voltage converter Q4. After the fourth voltage converter Q4 receives the corresponding pressure signal, it converts the corresponding pressure signal into a digital signal. For example, when the fourth voltage converter Q4 receives the preset output pressure signal, it outputs a third high-level signal to the servo drive module 52. After receiving the third high-level signal, the servo drive module 52 controls the pump outlet output pressure of the high-pressure oil pump 51 to stabilize to the preset output pressure until the turntable 1 stops rotating. The preset output pressure signal can be set according to the actual situation, and this embodiment of the utility model does not limit it.

[0090] Further reference Figure 1 The hydraulic turntable system also includes:

[0091] Oil suction filter 9;

[0092] An oil suction filter 9 is installed between the high-pressure oil pump 51 and the oil outlet of the oil tank 8.

[0093] Specifically, by installing an oil suction filter 9 between the high-pressure oil pump 51 and the oil outlet of the oil tank 8, the amount of impurities entering the high-pressure oil pump 51 can be reduced, thereby effectively reducing the failure rate of the high-pressure oil pump 51.

[0094] Furthermore, the turntable position acquisition module includes a position encoder.

[0095] Specifically, position encoders include absolute position encoders, incremental position encoders, etc., and this embodiment of the present invention does not limit them.

[0096] This utility model embodiment provides an injection molding machine, including a machine body and a hydraulic turntable system as described in any of the above technical solutions, and therefore has the beneficial effects of the above hydraulic turntable system, which will not be repeated here.

[0097] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0098] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A hydraulic rotary table system, characterized in that, include: Turntable, turntable drive module, directional valve, proportional valve, oil supply module, turntable position acquisition module, and control module; The first end of the directional valve is connected to the first connection end of the turntable drive module, the second end of the directional valve is connected to the second connection end of the turntable drive module, the third end of the directional valve is connected to the oil supply module, the fourth end of the directional valve is connected to the return oil pipeline, and the proportional valve is installed on the return oil pipeline. The turntable position acquisition module is electrically connected to the control module. The turntable position acquisition module is used to detect the position information of the turntable in real time and convert the position information of the turntable into a turntable position signal and transmit it to the control module. The control module is electrically connected to the directional valve, the proportional valve and the oil supply module. The control module is used to receive a set turntable rotation signal, control the oil supply module and the directional valve to open and operate, so as to drive the turntable to rotate. At the same time, it receives the turntable position signal and controls to reduce the opening of the proportional valve and the oil supply quantity and oil supply pressure of the oil supply module, so as to drive the turntable to decelerate smoothly through the turntable drive module until the turntable stops. The turntable rotation signal includes a turntable rotation direction signal and a turntable rotation position signal.

2. The hydraulic rotary table system according to claim 1, characterized in that, Also includes: First pressure sensor; The first pressure sensor is disposed between the fourth end of the directional valve and the proportional valve; The first pressure sensor is used to acquire the return oil pressure at the fourth outlet position of the directional valve in real time, and convert the return oil pressure into a return oil pressure signal and transmit it to the control module. The control module is used for: Receive the turntable rotation position signal and output a first braking position signal and a target position signal; When the turntable position signal is equal to the first brake position signal, the opening of the proportional valve is reduced. When the return oil pressure signal is greater than or equal to the preset return oil pressure signal, the proportional valve is controlled to maintain its current opening, and the oil supply module is controlled to gradually reduce the oil supply quantity and oil supply pressure according to the first oil supply threshold until the turntable reaches the target position.

3. The hydraulic rotary table system according to claim 2, characterized in that, The control module is also used for: When the turntable position signal equals the target position signal, the oil supply module is controlled to stop working.

4. The hydraulic rotary table system according to claim 1, characterized in that, Also includes: Return oil solenoid valve; The first end of the return oil solenoid valve is connected to the first end of the directional valve through a first return oil branch, the first end of the return oil solenoid valve is connected to the second end of the directional valve through a second return oil branch, the second end of the return oil solenoid valve is connected to the return oil pipeline through a third return oil branch, and the connection end of the third return oil branch and the return oil pipeline is located on the side of the proportional valve away from the directional valve. The control module is used to control the directional valve to close and the return oil solenoid valve to open when the turntable position signal is equal to the target position signal.

5. The hydraulic rotary table system according to claim 1, characterized in that, The turntable drive module includes two hydraulic motors; Two hydraulic motors are arranged opposite each other on both sides of the turntable. The first end of the directional valve is connected to the first connection end of the two hydraulic motors, and the second end of the directional valve is connected to the second connection end of the two hydraulic motors.

6. The hydraulic rotary table system according to claim 1, characterized in that, Also includes: tank; The fourth end of the directional valve is connected to the oil inlet of the oil tank through the oil return pipeline; The oil supply module includes: A high-pressure oil pump and a servo drive module; the high-pressure oil pump is located between the oil outlet of the oil tank and the third end of the directional valve; the first end of the servo drive module is electrically connected to the high-pressure oil pump, and the second end of the servo drive module is electrically connected to the control module; The control module is used to control the directional valve to open and operate according to the turntable rotation signal, and to control the servo drive module to drive the high-pressure oil pump to operate, and to control the directional valve to open and operate, so as to drive the turntable to rotate; It receives the turntable position signal and controls to reduce the opening of the proportional valve and the output pressure of the servo drive module, so as to drive the turntable to decelerate smoothly through the turntable drive module until the turntable stops.

7. The hydraulic rotary table system according to claim 6, characterized in that, The oil supply module also includes: Second pressure sensor; The second pressure sensor is electrically connected to the servo drive module; the second pressure sensor is used to detect the pump outlet output pressure of the high-pressure oil pump in real time, and convert the pump outlet output pressure into a pump outlet output pressure signal and transmit it to the servo drive module; the servo drive module is used to control the pump outlet output pressure of the high-pressure oil pump to stabilize to the preset output pressure when the pump outlet output pressure signal is equal to the preset output pressure signal, until the turntable stops rotating.

8. The hydraulic rotary table system according to claim 6, characterized in that, Also includes: Oil suction filter; The oil suction filter is installed between the high-pressure oil pump and the oil outlet of the oil tank.

9. The hydraulic rotary table system according to claim 1, characterized in that, The turntable position acquisition module includes a position encoder.

10. An injection molding machine, characterized in that, It includes the fuselage body and the hydraulic turntable system as described in any one of claims 1-9.

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