Active protection system for a hydraulic servo system

Abstract

The application belongs to the technical field of protection system, and specifically provides an active protection system of a hydraulic servo system, which comprises a passive control loop and an active controllable magnetic attraction element, the active controllable magnetic attraction element and the passive control loop can form an active control loop, the active controllable magnetic attraction element can activate the passive control loop at the same time, the priority of the active control loop is higher than that of the passive control loop, and the active control loop has the function of locking the passive control loop, and the output end of the passive control loop is connected to the hydraulic servo system; the application sets up a protective fence around the hydraulic servo system, and sets up a controllable protective door with a contact switch and an active controllable magnetic attraction element at a place of the protective fence, which can effectively prevent the entry of irrelevant personnel, and in the state that the active controllable magnetic attraction element is not attracted, if irrelevant personnel mistakenly enter, the controller controls the hydraulic servo system to stop working through an oil distributor, so as to avoid the occurrence of safety accidents.

Description

Technical Field

[0001] This invention belongs to the field of protection system technology, specifically relating to an active protection system for a hydraulic servo system. Background Technology

[0002] A hydraulic servo system enables the system's output, such as displacement, velocity, or force, to automatically, quickly, and accurately follow changes in the input, while simultaneously amplifying the output power. Due to its unique advantages such as fast response speed, high load stiffness, and high control power, hydraulic servo systems are widely used in industrial control.

[0003] Hydraulic servo systems use high-pressure oil during operation. Therefore, if unauthorized personnel accidentally enter the working area of ​​a hydraulic servo system, it can easily lead to unnecessary injuries or fatalities. To prevent such accidents, a common practice among hydraulic servo system users is to install safety barriers with warning signs in the work area, requiring manual supervision. However, this method is unreliable and wastes manpower due to the high volume of personnel entering and exiting the area and the relatively complex operating environment. Summary of the Invention

[0004] To address the shortcomings of existing technologies where hydraulic servo system users set up safety fences with warning signs in their work areas and assign personnel to monitor them, but often there are many people coming and going in the user areas, the usage environment is relatively complex, the reliability is not high, and manpower is wasted, this invention provides an active protection system for hydraulic servo systems to solve the above-mentioned technical problems.

[0005] This invention provides an active protection system for a hydraulic servo system, including a passive control loop and an active controllable magnetic attracting element. The active control loop, composed of the active controllable magnetic attracting element and the passive control loop, can simultaneously activate the passive control loop upon activation of the active controllable magnetic attracting element. The active control loop has a higher priority than the passive control loop and has the function of locking the passive control loop. The output end of the passive control loop is connected to the hydraulic servo system. The passive control loop can control the hydraulic servo system to perform corresponding tests on the parts of the vehicle under test when the active controllable magnetic attracting element is engaged, and can also independently control the hydraulic servo system to perform corresponding tests on the parts of the vehicle under test when the active controllable magnetic attracting element fails to engage.

[0006] Further improvements to this technical solution include a passive control circuit comprising a hydraulic feedback circuit, a switch control circuit, and a power supply circuit that supplies power to the entire active protection system, with the switch control circuit electrically connected to the hydraulic feedback circuit.

[0007] Further improvements to this technical solution include a hydraulic feedback loop comprising a controller, junction box, mounting panel, first switch, and oil distributor.

[0008] The low-pressure oil command or high-pressure oil command output by the controller is output to the signal input terminal of the oil distributor through the junction box, and the controller is connected to the power supply control terminal of the oil distributor through the first push-button switch. The signal output terminal of the oil distributor is connected to the oil tank of the hydraulic servo system. The junction box is installed on the mounting panel, and the first switch is installed on the junction box.

[0009] Further improvements to this technical solution include a switch control circuit comprising a BNC adapter, a second switch, a contact switch, a high / low voltage switching switch, and an emergency stop switch.

[0010] The BNC adapter communicates with the controller via a junction box. The first end of the BNC adapter is connected to the first end of the emergency stop switch. The second switch and the contact switch are connected in parallel and placed between the second end of the emergency stop switch and the first end of the high-low voltage switching switch. The second end of the high-low voltage switching switch is connected to the second end of the BNC adapter.

[0011] Further improvements to this technical solution include a power supply circuit comprising an air switch and a power converter. The input terminal of the air switch is connected to an external power source, and the output terminal of the air switch is connected to the input terminal of the power converter. An oil pressure indicator light for indicating the oil pressure status is connected in parallel with the BNC adapter and the oil distributor and is positioned between the positive and negative output terminals of the power converter. The power converter provides 24V power to the oil pressure indicator light, the BNC adapter, and the oil distributor.

[0012] A further improvement to this technical solution is that the power converter is nested and fixed on the mounting panel.

[0013] Further improvements to this technical solution include an active protection system that also includes a protective door, a protective frame, and a protective wall. The protective frame is fixed to the ground around the hydraulic servo system, and the protective wall is installed around the protective frame. The protective wall has an opening, and a slide rail is installed on the ground at the opening. The protective door is slidably connected to the slide rail. When the active controllable magnetic attraction element is engaged, the protective door cannot be opened.

[0014] Further improvements to this technical solution include installing all contact switches on the protective door.

[0015] Further improvements to this technical solution include an active protection system that also includes a control box. The control box is located outside the protective enclosure. The second switch, high-low voltage switching switch, and emergency stop switch are located inside the control box. In the passive control circuit, all other components except for the second switch, contact switch, high-low voltage switching switch, and emergency stop switch are located inside the protective enclosure.

[0016] Further improvements to this technical solution include the following: when the hydraulic system is operating normally, if the controller receives a dynamic change in any of the contact switches, high / low pressure switching switches, and emergency stop switches, the controller will output a low-pressure oil command to the distributor.

[0017] The beneficial effects of this invention are that by setting up a protective wall around the hydraulic servo system and setting up a protective door at one point of the protective wall that can be controlled by a contact switch and an active controllable magnetic attraction element, it can effectively prevent unauthorized personnel from entering. Furthermore, if unauthorized personnel accidentally enter when the active controllable magnetic attraction element is not engaged, the controller will control the hydraulic servo system to stop working through the oil distributor, thus avoiding the occurrence of safety accidents.

[0018] Furthermore, the design principle of this invention is reliable, the structure is simple, and it has a very wide range of application prospects. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an active protection system.

[0021] Figure 2 This is the circuit diagram of the power supply circuit.

[0022] 110 is an active controllable magnetic attraction element; 121 is a controller; 122 is a junction box; 123 is a mounting panel; 124 is the first switch; 125 is an oil distributor; 131 is a BNC adapter; 132 is the second switch; 133 is a contact switch; 134 is a high / low voltage switching switch; 135 is an emergency stop switch; 141 is an air switch; 142 is a power converter; 143 is a hydraulic pressure indicator light; 144 is a hydraulic pressure switch; 145 is an overcurrent protection relay; 151 is a protective door; 152 is a protective frame; 153 is a protective fence. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0025] The key terms used in this invention will be explained below.

[0026] BNC, Bayonet Neill-Concelman, is a common type of coaxial cable terminator. A BNC adapter must be connected to both ends of each cable segment and consists of a center pin, an outer sleeve, and a retainer.

[0027] like Figure 1 and 2 As shown, this invention provides an active protection system for a hydraulic servo system, including a passive control loop and an active controllable magnetic element 110. The active control loop, composed of the active controllable magnetic element 110 and the passive control loop, can simultaneously activate the passive control loop when the active controllable magnetic element 110 is activated. The active control loop has a higher priority than the passive control loop and has the function of locking the passive control loop. The output end of the passive control loop is connected to the hydraulic servo system. The passive control loop can control the hydraulic servo system to perform corresponding tests on the parts of the vehicle under test when the active controllable magnetic element 110 is engaged, and can also independently control the hydraulic servo system to perform corresponding tests on the parts of the vehicle under test when the active controllable magnetic element 110 fails to engage.

[0028] The passive control circuit includes a hydraulic feedback circuit, a switch control circuit, and a power supply circuit that supplies power to the entire active protection system. The switch control circuit is electrically connected to the hydraulic feedback circuit.

[0029] Specifically, the hydraulic feedback loop includes a controller 121, a junction box 122, a mounting panel 123, a first switch 124, and a distributor 125. The controller 121 is also connected to an active controllable magnetic element 110, which can be a contactor or a relay. The low-pressure oil command or high-pressure oil command output by the controller 121 is output to the signal input terminal of the distributor 125 through the junction box 122. The controller 121 is connected to the power supply control terminal of the distributor 125 through a first push-button switch, and the signal output terminal of the distributor 125 is connected to the oil tank of the hydraulic servo system. The junction box 122 is mounted on the mounting panel 123, and the first switch 124 is mounted on the junction box 122. The junction box 122 and the controller 121 are connected via a three-core communication cable.

[0030] The switch control circuit includes a BNC adapter 131, a second switch 132, a contact switch 133, a high / low pressure switching switch 134, and an emergency stop switch 135. The BNC adapter 131 is communicatively connected to the controller 121 via a junction box 122. The first end of the BNC adapter 131 is connected to the first end of the emergency stop switch 135. The second switch 132 and the contact switch 133 are connected in parallel and positioned between the second end of the emergency stop switch 135 and the first end of the high / low pressure switching switch 134. The second end of the high / low pressure switching switch 134 is connected to the second end of the BNC adapter 131. When the hydraulic system is operating normally, if the controller 121 receives a dynamic change in any of the contact switches 133, the high / low pressure switching switch 134, and the emergency stop switch 135, the controller 121 outputs a low-pressure oil command to the distributor 125. Among them, the high-low voltage switching switch 134 is a rotary switch with a moving contact for forward operation and a holding function, and the emergency stop switch 135 is a push-button switch with a moving contact and a holding function.

[0031] The high / low voltage changeover switch 134 can remotely control the controller 121. When the high / low voltage changeover switch 134 is in the OFF position, the controller 121 cannot work normally. The controller 121 only has the prerequisite for normal operation when the high / low voltage changeover switch 134 is in the ON position. Furthermore, if the controller 121 malfunctions due to reasons other than those related to the high / low voltage changeover switch 134, the high / low voltage changeover switch 134 will also malfunction. Additionally, the BNC adapter 131 can only function normally when the high / low voltage changeover switch 134, the emergency stop switch 135, and the contact switch 133 are all working properly. Furthermore, the BNC adapter 131 and the first switch 124 form a constraint relationship. When the BNC adapter 131 is functioning normally, the first switch 124 can be closed to form a circuit. The first switch 124 can control the power supply of the oil distributor 125. At this time, if the controller 121 issues a high-pressure oil command to form a high-pressure oil feedback loop, the pressure distributor controls the hydraulic servo system to output high-pressure oil. If the first switch 124 is open, the prerequisite for a high-pressure oil feedback loop is not met, and the hydraulic servo system can only output high-pressure oil.

[0032] The power supply circuit includes an air switch 141 and a power converter 142. The input terminal of the air switch 141 is connected to an external power source, and the output terminal of the air switch 141 is connected to the input terminal of the power converter 142. An oil pressure indicator light 143, used to indicate the oil pressure status, is connected in parallel with the BNC adapter 131 and the oil distributor 125, and is positioned between the positive and negative output terminals of the power converter 142. The power converter 142 provides 24V power to the oil pressure indicator light 143, the BNC adapter 131, and the oil distributor 125. The power converter 142 is nested and fixed on the mounting panel 123. To protect the BNC adapter 131, an overcurrent protection relay 145 is connected in series between the positive output terminal of the power converter 142 and the BNC adapter 131. To control the operating status of the indicator light, an oil pressure switch 144 is connected in series between the positive output terminal of the power converter 142 and the oil pressure indicator light 143.

[0033] In addition, the active protection system also includes a protective door 151, a protective frame 152, and a protective wall 153. The protective frame 152 is fixed to the ground around the hydraulic servo system, and the protective wall 153 is installed around the protective frame 152. The protective wall 153 has an opening, and a slide rail is installed on the ground at the opening. The protective door 151 is slidably connected to the slide rail. The active control circuit has a higher priority than the passive control circuit and has the function of locking the passive control circuit. When the active controllable magnetic attraction element 110 is engaged, even if the contact switch 133 is triggered in the passive control circuit, the protective door 151 will never be able to open, which can effectively prevent unauthorized personnel from entering and avoid safety accidents. The protective frame 152 is made of aluminum alloy, and the protective wall 153 is made of acrylic.

[0034] Contact switch 133 is installed on protective door 151. When personnel need to enter the protective enclosure 153 to inspect the hydraulic system or replace parts of the vehicle under test, the personnel need to disconnect the active controllable magnetic attraction element 110 while it is engaged, and set the high / low voltage switch 134 to the low voltage position. Figure 1When the high / low voltage switch 134 is in the high-voltage position and the second switch 132 is pressed, the contact switch 133 is short-circuited, rendering the contact switch 133 inoperable. Only then can the personnel control the opening of the protective door 151 and safely enter the protective enclosure 153. After the personnel have completed the replacement, inspection, or maintenance, the protective door 151 must be closed and the second switch 132 must be disconnected. When the protective door 151 is closed to the designated position, the contact switch 133 closes, and the protection is effective. The structural durability and road simulation tests can be safely conducted. During the test, the active controllable magnetic attraction element 110 is always in the attracted state. During the test, if the protective door 151 is suddenly opened due to force majeure, the contact switch 133 will open and trigger the emergency stop switch 135. The BNC adapter 131 will malfunction, the controller 121 will malfunction, and the active control circuit will control the high and low oil pressures of the hydraulic servo system to unload, thus stopping the test.

[0035] In addition, the active protection system also includes a control box, which is located outside the protective wall 153. The second switch 132, the high-low voltage switching switch 134 and the emergency stop switch 135 are located inside the control box. In the passive control circuit, all other components except the second switch 132, the contact switch 133, the high-low voltage switching switch 134 and the emergency stop switch 135 are located inside the protective wall 153.

[0036] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope of the claims.

Claims

1. An active protection system for a hydraulic servo system, characterized in that, It includes a passive control loop and an active controllable magnetic attraction element. The active controllable magnetic attraction element and the passive control loop can form an active control loop. Activating the active controllable magnetic attraction element can simultaneously activate the passive control loop. The active control loop has a higher priority than the passive control loop and has the function of locking the passive control loop. The output of the passive control loop is connected to the hydraulic servo system. The passive control loop can control the hydraulic servo system to perform corresponding tests on the parts of the vehicle under test when the active controllable magnetic attraction element is engaged, and it can also independently control the hydraulic servo system to perform corresponding tests on the parts of the vehicle under test when the active controllable magnetic attraction element fails to engage. The passive control circuit includes a hydraulic feedback circuit, a switch control circuit, and a power supply circuit that supplies power to the entire active protection system. The switch control circuit is electrically connected to the hydraulic feedback circuit. The hydraulic feedback loop includes a controller, junction box, mounting panel, first switch, and oil distributor; the controller is also connected to an active controllable magnetic element. The low-pressure oil command or high-pressure oil command output by the controller is output to the signal input terminal of the oil distributor through the junction box, and the controller is connected to the power supply control terminal of the oil distributor through the first switch. The signal output terminal of the oil distributor is connected to the oil tank of the hydraulic servo system. The junction box is installed on the mounting panel, and the first switch is installed on the junction box. The switch control circuit includes a BNC adapter, a second switch, a contact switch, a high / low voltage changeover switch, and an emergency stop switch. The BNC adapter communicates with the controller via a junction box. The first end of the BNC adapter is connected to the first end of the emergency stop switch. The second switch and the contact switch are connected in parallel and placed between the second end of the emergency stop switch and the first end of the high-low voltage switching switch. The second end of the high-low voltage switching switch is connected to the second end of the BNC adapter. All contact switches are installed on the protective door.

2. The active protection system for the hydraulic servo system according to claim 1, characterized in that, The power supply circuit includes an air switch and a power converter. The input terminal of the air switch is connected to an external power source, and the output terminal of the air switch is connected to the input terminal of the power converter. The oil pressure indicator light, which indicates the oil pressure status, is connected in parallel with the BNC adapter and the oil distributor and is located between the positive and negative output terminals of the power converter. The power converter provides 24V power to the oil pressure indicator light, the BNC adapter, and the oil distributor.

3. The active protection system for the hydraulic servo system according to claim 2, characterized in that, The power converter is nested and secured to the mounting panel.

4. The active protection system for the hydraulic servo system according to claim 1, characterized in that, The active protection system also includes a protective door, a protective frame, and a protective wall. The protective frame is fixed to the ground around the hydraulic servo system, and the protective wall is installed around the protective frame. The protective wall has an opening, and a slide rail is installed on the ground at the opening. The protective door is slidably connected to the slide rail. When the active controllable magnetic attraction element is engaged, the protective door cannot be opened.

5. The active protection system for the hydraulic servo system according to claim 4, characterized in that, The active protection system also includes a control box, which is located outside the protective wall. The second switch, high-low voltage switching switch and emergency stop switch are located inside the control box. In the passive control circuit, all other components except for the second switch, contact switch, high-low voltage switching switch and emergency stop switch are located inside the protective wall.

6. The active protection system for the hydraulic servo system according to claim 1, characterized in that, When the hydraulic system is working normally, if the controller receives a dynamic change in any of the contact switches, high / low pressure switching switches, and emergency stop switches, the controller will output a low-pressure oil command to the distributor.

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