Hydraulic cylinder telescopic control system and industrial production equipment

Abstract

The utility model provides an oil pressure cylinder telescopic control system and industrial production equipment relates to industrial production equipment technical field. In this oil pressure cylinder telescopic control system, the inlet of pressure increasing device and the inner chamber bottom of oil pool are in fluid communication, and the outlet of pressure increasing device and pressure increasing pipeline are in fluid communication; one end of first pressure increasing opening and closing branch and one end of second pressure increasing opening and closing branch are in fluid communication with pressure increasing pipeline respectively, and the other end of first pressure increasing opening and closing branch and the other end of second pressure increasing opening and closing branch are in fluid communication with rodless cavity of telescopic oil cylinder respectively; one end of third pressure increasing opening and closing branch is in fluid communication with pressure increasing pipeline, and the other end of third pressure increasing opening and closing branch is in fluid communication with the rod cavity of telescopic oil cylinder. Not only can the response speed, precision and stability of rodless cavity pressure increasing process be guaranteed, but also the problem of pressure fluctuation and response lag can be solved, and the pressure control precision can be improved.

Description

Technical Field

[0001] This utility model relates to the field of industrial production equipment technology, and in particular to a hydraulic cylinder telescopic control system and industrial production equipment. Background Technology

[0002] In industrial production processes, the driving and execution of numerous linear movements rely on hydraulic cylinders. The output force of a hydraulic cylinder is determined by the pressure of the working medium (usually hydraulic oil) within the cylinder, and their relationship follows the classical mechanics formula F=P×A, where F is the output force (unit: N), P is the oil chamber pressure (unit: MPa or bar), and A is the effective working area of ​​the piston. In stamping processes, material testing machines, and other equipment requiring precise load application, such as the granulation stage in acetylene black production, the hydraulic cylinder needs to provide a stable clamping force for the granulation template. Pressure fluctuations can cause changes in the template gap, resulting in deviations in the carbon black particle size and affecting product performance. Therefore, precise control of the hydraulic cylinder output pressure is of significant technical importance in carbon black production and performance testing. Currently, mainstream pressure control methods mainly include open-loop regulation using relief valves and pressure reducing valves, or closed-loop control systems using servo motors linked to pressure sensors to achieve finer pressure regulation.

[0003] However, existing technical solutions still have several key shortcomings: Firstly, they fail to effectively monitor and manage the state of the hydraulic transmission medium. During hydraulic system operation, air can easily mix into the hydraulic oil and form bubbles due to insufficient oil suction, poor pipeline sealing, or inadequate oil degassing. These bubbles are compressible under pressure changes, significantly affecting the system's bulk modulus of elasticity, leading to problems such as pressure fluctuations, response lag, and decreased control accuracy. Secondly, existing control strategies generally lack a systematic consideration of the overall characteristics of the hydraulic transmission loop. According to the pressure transmission principle, the pipeline structure, volumetric effect, and changes in the flow cross-section from the pump source to the actuator all affect dynamic response characteristics and steady-state accuracy. Theoretically, when the equivalent flow cross-sectional area of ​​the oil pipeline is much smaller than the effective working area of ​​the hydraulic cylinder piston, the sensitivity and resolution of pressure control can be improved; however, at the same time, the system response speed will be reduced due to the compressibility of the fluid and pipeline resistance. Therefore, there is an inherent dynamic trade-off between the design of the transmission path and control performance.

[0004] In summary, current pressure control technologies focus primarily on optimizing terminal adjustment elements, while neglecting the coordinated management of medium conditions and transmission channels, thus hindering the further development of high-precision and high-stability hydraulic pressure control. Utility Model Content

[0005] The purpose of this utility model is to provide a hydraulic cylinder telescopic control system and industrial production equipment to alleviate the technical problem that it is difficult to balance the response speed, accuracy and stability of hydraulic control in the prior art.

[0006] In a first aspect, the hydraulic cylinder telescopic control system provided by this utility model includes: an oil tank, a pressurizing device, a pressurizing pipeline, a first pressurizing opening and closing branch, a second pressurizing opening and closing branch, a third pressurizing opening and closing branch, a first return opening and closing branch, a second return opening and closing branch, a return pipeline, and a telescopic hydraulic cylinder. The inlet of the booster device is in fluid communication with the bottom of the inner cavity of the oil tank, and the outlet of the booster device is in fluid communication with the booster pipeline. One end of the first pressurization opening and closing branch and one end of the second pressurization opening and closing branch are respectively in fluid communication with the pressurization pipeline, and the other end of the first pressurization opening and closing branch and the other end of the second pressurization opening and closing branch are respectively in fluid communication with the rodless chamber of the telescopic cylinder. One end of the third pressurization opening and closing branch is in fluid communication with the pressurization pipeline, and the other end of the third pressurization opening and closing branch is in fluid communication with the rod chamber of the telescopic cylinder. One end of the first return flow switching branch and one end of the second return flow switching branch are respectively in fluid communication with the return pipeline, the other end of the first return flow switching branch is in fluid communication with the rodless cavity, and the other end of the second return flow switching branch is in fluid communication with the rod cavity. The return pipeline is in fluid communication with the oil tank.

[0007] In conjunction with the first aspect, this utility model provides a first possible implementation of the first aspect, wherein the first boosting on / off branch is provided with a first solenoid valve, the second boosting on / off branch is provided with a second solenoid valve, the third boosting on / off branch is provided with a third solenoid valve, the first return on / off branch is provided with a fourth solenoid valve, and the second return on / off branch is provided with a fifth solenoid valve.

[0008] In conjunction with the first aspect, this utility model provides a second possible implementation of the first aspect, wherein a pressure transmitter is installed at one end of the first booster switch branch and the second booster switch branch that connects to the rodless cavity; The diameter of the first booster switch branch is larger than the diameter of the second booster switch branch.

[0009] In conjunction with the first aspect, this utility model provides a third possible implementation of the first aspect, wherein the pressurization pipeline is provided with an overflow valve, and the overflow pipeline of the overflow valve is in fluid communication with the oil tank.

[0010] In conjunction with the first aspect, this utility model provides a fourth possible implementation of the first aspect, wherein the booster device includes: an oil pump and an electric motor drively connected to the oil pump; The inlet of the oil pump is in fluid communication with the bottom of the inner cavity of the oil tank, and the outlet of the oil pump is in fluid communication with the booster pipeline.

[0011] In conjunction with the fourth possible implementation of the first aspect, this utility model provides a fifth possible implementation of the first aspect, wherein a first check valve is installed between the oil tank and the oil pump.

[0012] In conjunction with the fourth possible implementation of the first aspect, this utility model provides a sixth possible implementation of the first aspect, wherein a filter is installed between the oil pump and the booster pipeline.

[0013] In conjunction with the first aspect, this utility model provides a seventh possible implementation of the first aspect, wherein the hydraulic cylinder extension and retraction control system further includes a vacuum pump, and the vacuum pump is in fluid communication with the gas phase region of the oil tank cavity.

[0014] In conjunction with the seventh possible implementation of the first aspect, this utility model provides an eighth possible implementation of the first aspect, wherein a second one-way valve is installed between the oil tank and the vacuum pump.

[0015] Secondly, the industrial production equipment provided by this utility model is equipped with the hydraulic cylinder telescopic control system described in the first aspect.

[0016] The present invention provides the following beneficial effects: the inlet of the booster device is fluidly connected to the bottom of the inner cavity of the oil tank, the outlet of the booster device is fluidly connected to the booster pipeline, one end of the first booster opening and closing branch and one end of the second booster opening and closing branch are respectively fluidly connected to the booster pipeline, the other end of the first booster opening and closing branch and the other end of the second booster opening and closing branch are respectively fluidly connected to the rodless chamber of the telescopic cylinder, one end of the third booster opening and closing branch is fluidly connected to the booster pipeline, the other end of the third booster opening and closing branch is fluidly connected to the rod chamber of the telescopic cylinder, one end of the first return opening and closing branch and one end of the second return opening and closing branch are respectively fluidly connected to the return pipeline, the other end of the first return opening and closing branch is fluidly connected to the rodless chamber, the other end of the second return opening and closing branch is fluidly connected to the rod chamber, and the return pipeline is fluidly connected to the oil tank. By controlling the on / off state of the first and second booster opening and closing branches, the response speed, accuracy, and stability of the booster process in the rodless chamber can be ensured.

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the hydraulic cylinder telescopic control system provided in the embodiment of this utility model.

[0020] Icons: 001-Oil sump; 002-Pressure booster; 201-Oil pump; 202-Motor; 003-Pressure booster pipeline; 004-First pressure booster on / off branch; 005-Second pressure booster on / off branch; 006-Third pressure booster on / off branch; 007-First return flow on / off branch; 008-Second return flow on / off branch; 009-Return pipeline; 010-Telescopic cylinder; 011-Rodless chamber; 012-Rod chamber; 013-First solenoid valve; 014-Second solenoid valve; 015-Third solenoid valve; 016-Fourth solenoid valve; 017-Fifth solenoid valve; 018-Pressure transmitter; 019-Relief valve; 020-First check valve; 021-Filter; 022-Vacuum pump; 023-Second check valve. Detailed Implementation

[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," and "third" are only used to describe differences in name and should not be construed as indicating or implying relative importance. Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities of the International System of Units (SI) base units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figure 1 As shown, the hydraulic cylinder telescopic control system provided in this embodiment includes: an oil tank 001, a pressurizing device 002, a pressurizing pipeline 003, a first pressurizing on / off branch 004, a second pressurizing on / off branch 005, a third pressurizing on / off branch 006, a first return flow on / off branch 007, a second return flow on / off branch 008, a return pipeline 009, and a telescopic hydraulic cylinder 010; the inlet of the pressurizing device 002 is fluidly connected to the bottom of the inner cavity of the oil tank 001, and the outlet of the pressurizing device 002 is fluidly connected to the pressurizing pipeline 003; one end of the first pressurizing on / off branch 004 and one end of the second pressurizing on / off branch 005 are respectively fluidly connected to the pressurizing pipeline 003, and the first pressurizing on / off branch 006 is fluidly connected to the pressurizing pipeline ... The other end of the closed branch 004 and the other end of the second booster opening and closing branch 005 are respectively fluidly connected to the rodless chamber 011 of the telescopic cylinder 010; one end of the third booster opening and closing branch 006 is fluidly connected to the booster pipe 003, and the other end of the third booster opening and closing branch 006 is fluidly connected to the rod chamber 012 of the telescopic cylinder 010; one end of the first return opening and closing branch 007 and one end of the second return opening and closing branch 008 are respectively fluidly connected to the return pipe 009, the other end of the first return opening and closing branch 007 is fluidly connected to the rodless chamber 011, and the other end of the second return opening and closing branch 008 is fluidly connected to the rod chamber 012; the return pipe 009 is fluidly connected to the oil sump 001.

[0025] Specifically, the oil sump 001 is used to store hydraulic working medium (such as anti-wear hydraulic oil), and its inner cavity bottom is equipped with a sedimentation structure and filter screen to prevent impurities from entering the system circulation loop. The booster device 002 can be a variable displacement piston pump or a constant pressure variable displacement pump. Its inlet is fluidly connected to the bottom of the oil sump 001 through an oil suction pipe, and its outlet is connected to the booster pipeline 003 to provide high-pressure hydraulic oil to the system. The booster line 003 serves as the main oil supply channel, connecting to three booster on / off branches: one end of the first booster on / off branch 004 is connected to the booster line 003, and the other end is connected to the rodless chamber 011 of the telescopic cylinder 010; one end of the second booster on / off branch 005 is also connected to the booster line 003, and the other end is also connected to the rodless chamber 011, achieving parallel oil supply from two lines; one end of the third booster on / off branch 006 is connected to the booster line 003, and the other end is connected to the rod chamber 012, used to supply pressure to the rod chamber under specific operating conditions to achieve differential retraction or other combined actions. Each booster on / off branch is composed of an electromagnetic directional valve or an electrically controlled ball valve, possessing remotely controllable opening and closing functions, and each branch is equipped with a pressure sensor and a flow meter for real-time monitoring of the circuit status parameters. One end of the return line 009 is connected to the return port on the top or side wall of the oil sump 001, and the other end splits into two branches: the first return line on / off branch 007 connects the return line 009 to the rodless chamber 011, controlling the pressure relief and return of oil from the rodless chamber; the second return line on / off branch 008 connects the return line 009 to the rod chamber 012, controlling the pressure relief and return of oil from the rod chamber. Each return line on / off branch also uses an electrically controlled valve to ensure precise control of the timing and rate of oil return, avoiding hydraulic shock. The diameter of the first booster branch 004 is larger than that of the second booster branch 005. The diameter (or flow area) of the first booster branch 004 is set to a preset value, and the diameter (or flow area) of the second booster branch 005 is set to 25% of the preset value. During the pressurization process, the first booster branch 004 is first opened and the second booster branch 005 is closed, thereby enabling rapid pressurization of the rodless chamber 011. When the pressure reaches 95% of the preset pressure, the first booster branch 004 is closed and the second booster branch 005 is opened, at which point the oil pressure increases slowly to improve the accuracy of oil pressure control. This segmented pressurization strategy effectively solves the contradiction problem in traditional hydraulic systems where "fast response leads to poor accuracy, and high accuracy leads to slow response."

[0026] In addition, the hydraulic cylinder telescopic control system can also integrate a PLC controller or embedded control unit, preset multiple working modes (such as high-speed mode, precision mode, energy-saving mode, etc.), and automatically call the corresponding branch combination and control parameters according to different application scenarios.

[0027] In this embodiment of the invention, the first boosting opening and closing branch 004 is equipped with a first solenoid valve 013, the second boosting opening and closing branch 005 is equipped with a second solenoid valve 014, the third boosting opening and closing branch 006 is equipped with a third solenoid valve 015, the first return opening and closing branch 007 is equipped with a fourth solenoid valve 016, and the second return opening and closing branch 008 is equipped with a fifth solenoid valve 017. The first solenoid valve 013, the second solenoid valve 014, the third solenoid valve 015, the fourth solenoid valve 016, and the fifth solenoid valve 017 can be connected to a PLC controller. This PLC controller has multiple preset control logic programs and can automatically control the opening and closing sequence of each solenoid valve according to external commands or sensor feedback signals, thereby achieving precise control of the movement direction, speed, and pressure holding state of the telescopic cylinder 010.

[0028] Furthermore, a pressure transmitter 018 is installed at one end of the first booster on / off branch 004 and the second booster on / off branch 005 that connects to the rodless chamber 011. This pressure transmitter 018 monitors the oil pressure at the inlet of the rodless chamber 011 in real time and converts the pressure signal into a standard electrical signal, which is then fed back to the PLC controller, forming a closed-loop pressure monitoring mechanism. The PLC controller can dynamically adjust the operating parameters of the booster device 002 or the on / off sequence of the solenoid valve according to a preset pressure threshold, ensuring the safety and accuracy of the execution process.

[0029] In an optional embodiment, the pressurization line 003 is equipped with an overflow valve 019, and the overflow line of the overflow valve 019 is in fluid communication with the oil sump 001.

[0030] Furthermore, the booster device 002 includes: an oil pump 201 and a motor 202 drivingly connected to the oil pump 201; the inlet of the oil pump 201 is in fluid communication with the bottom of the inner cavity of the oil sump 001, and the outlet of the oil pump 201 is in fluid communication with the booster pipeline 003. The oil pump 201 is a variable displacement piston pump or a gear pump, capable of constant pressure or constant flow output; the motor 202 is a servo motor or a variable frequency motor, whose speed can be adjusted according to system requirements, thereby dynamically adjusting the oil supply pressure and flow rate. The inlet of the oil pump 201 is connected to the bottom of the oil sump 001 via a filter, and the outlet is connected to the booster pipeline 003 to form the main booster channel.

[0031] Furthermore, a first check valve 020 is installed between the oil sump 001 and the oil pump 201. The first check valve 020 prevents hydraulic oil from flowing back from the oil pump 201 to the oil sump 001. The first check valve 020 can be used to remove air bubbles generated by backflow before the oil pump 201 pressurizes.

[0032] Furthermore, a filter 021 is installed between the oil pump 201 and the booster line 003 to filter the hydraulic oil and ensure the cleanliness of the hydraulic oil participating in the circulation.

[0033] In an optional embodiment, the hydraulic cylinder extension and retraction control system further includes a vacuum pump 022, which is in fluid communication with the gas phase region inside the oil tank 001. The vacuum pump 022 can draw the gas phase region inside the oil tank 001 to a negative pressure state (lower than the external atmospheric pressure), thereby further reducing the amount of air bubbles mixed in with the oil in the oil tank 001.

[0034] In addition, a second check valve 023 is installed between the oil tank 001 and the vacuum pump 022. The vacuum pump 022 can be controlled by a PLC controller to start and stop at regular intervals. The second check valve 023 can prevent gas from flowing back from the vacuum pump 022 into the oil tank 001.

[0035] The industrial production equipment provided in this embodiment of the present invention is equipped with the hydraulic cylinder telescopic control system described in the above embodiments. The industrial production equipment uses the telescopic hydraulic cylinder 010 to drive linear reciprocating motion. Under the condition that the hydraulic control response speed, accuracy and stability can be guaranteed, the operation stability and accuracy of the industrial production equipment are better.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hydraulic cylinder telescopic control system, characterized in that, include: Oil tank (001), pressurizing device (002), pressurizing pipeline (003), first pressurizing switch branch (004), second pressurizing switch branch (005), third pressurizing switch branch (006), first return switch branch (007), second return switch branch (008), return pipeline (009) and telescopic cylinder (010); The inlet of the booster device (002) is in fluid communication with the bottom of the inner cavity of the oil tank (001), and the outlet of the booster device (002) is in fluid communication with the booster pipeline (003). One end of the first booster switch branch (004) and one end of the second booster switch branch (005) are respectively fluidly connected to the booster pipeline (003), and the other end of the first booster switch branch (004) and the other end of the second booster switch branch (005) are respectively fluidly connected to the rodless chamber (011) of the telescopic cylinder (010); One end of the third pressurization opening and closing branch (006) is in fluid communication with the pressurization pipeline (003), and the other end of the third pressurization opening and closing branch (006) is in fluid communication with the rod chamber (012) of the telescopic cylinder (010). One end of the first return flow switching branch (007) and one end of the second return flow switching branch (008) are respectively fluidly connected to the return flow pipeline (009), the other end of the first return flow switching branch (007) is fluidly connected to the rodless cavity (011), and the other end of the second return flow switching branch (008) is fluidly connected to the rod cavity (012). The return pipeline (009) is in fluid communication with the oil tank (001).

2. The hydraulic cylinder telescopic control system according to claim 1, characterized in that, The first booster switch branch (004) is equipped with a first solenoid valve (013), the second booster switch branch (005) is equipped with a second solenoid valve (014), the third booster switch branch (006) is equipped with a third solenoid valve (015), the first return switch branch (007) is equipped with a fourth solenoid valve (016), and the second return switch branch (008) is equipped with a fifth solenoid valve (017).

3. The hydraulic cylinder telescopic control system according to claim 1, characterized in that, A pressure transmitter (018) is installed at one end of the first booster switch branch (004) and the second booster switch branch (005) that connects to the rodless cavity (011). The diameter of the first booster switch branch (004) is larger than the diameter of the second booster switch branch (005).

4. The hydraulic cylinder telescopic control system according to claim 1, characterized in that, The pressurization pipeline (003) is equipped with an overflow valve (019), and the overflow pipeline of the overflow valve (019) is in fluid communication with the oil sump (001).

5. The hydraulic cylinder telescopic control system according to claim 1, characterized in that, The booster device (002) includes: an oil pump (201) and an electric motor (202) that is driven to the oil pump (201). The inlet of the oil pump (201) is in fluid communication with the bottom of the inner cavity of the oil tank (001), and the outlet of the oil pump (201) is in fluid communication with the booster pipeline (003).

6. The hydraulic cylinder telescopic control system according to claim 5, characterized in that, A first check valve (020) is installed between the oil tank (001) and the oil pump (201).

7. The hydraulic cylinder telescopic control system according to claim 5, characterized in that, A filter (021) is installed between the oil pump (201) and the booster line (003).

8. The hydraulic cylinder telescopic control system according to claim 1, characterized in that, The hydraulic cylinder telescopic control system also includes a vacuum pump (022), which is in fluid communication with the gas phase region of the inner cavity of the oil tank (001).

9. The hydraulic cylinder telescopic control system according to claim 8, characterized in that, A second check valve (023) is installed between the oil tank (001) and the vacuum pump (022).

10. An industrial production equipment, characterized in that, The industrial production equipment is equipped with the hydraulic cylinder telescopic control system as described in any one of claims 1 to 9.

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