Temperature control device for valve electro-hydraulic actuating mechanism

Abstract

The utility model relates to a temperature control device for a valve electro-hydraulic actuating mechanism, which comprises a hot melting device and a temperature sensor, the temperature sensor is arranged on site and used for detecting on-site environment temperature, the hot melting device is arranged in the electro-hydraulic actuating mechanism, and the hot melting device comprises a valve body and a temperature sensing device. The utility model has the advantages that the maintenance personnel can check the on-site environment temperature at any time, and when the on-site environment temperature exceeds a set value, the HMI man-machine interaction screen gives an alarm prompt and uploads the alarm prompt to a central control room without manual on-site inspection; the hot melting device is provided with a hot melting metal sheet, the hot melting metal sheet is connected between the thrust rod and the temperature sensing device shell, and when the supporting force of the thrust rod and the temperature sensing device shell is borne and the environment temperature reaches the hot melting metal melting temperature, the hot melting metal sheet can be heated to disconnect the first metal connecting sheet and the second metal connecting sheet; and the bottom end of the thrust rod extends into the through hole, so that the baffle can be effectively prevented from resetting under the action of the baffle resetting spring.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a temperature control device for a valve electro-hydraulic actuator. Background Art

[0002] The tank root valve is a physical isolation device between the oil depot tank body and the connecting pipeline. When a fire or pipeline leakage occurs around the tank area, it can timely isolate the tank from the outside world. The tank root valve is driven by an electro-hydraulic actuator. The on-site ambient temperature is usually detected by a temperature sensor. The temperature sensor is connected to the temperature controller on the instrument cabinet in the control room through a control cable. When the temperature in the tank area exceeds the set value, the temperature controller is activated to make the sound and light alarm sound. This method requires inspection personnel to regularly go to the instrument cabinet to manually record the temperature data of the temperature controller. Due to manual recording, it is inevitable that the recorded data is untrue and delayed. If the temperature sensor is damaged and not discovered in time, it will endanger production and personal safety, and it is urgently needed to be improved. Summary of the invention

[0003] The utility model aims to provide a temperature control device for a valve electro-hydraulic actuator. A PLC is connected to a temperature sensor for real-time acquisition of ambient temperature information. A hot melt device is added to the electro-hydraulic actuator to improve safety.

[0004] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] A temperature control device for a valve electro-hydraulic actuator comprises a hot melt device and a temperature sensor. The hot melt device is used to respond to ambient temperature, and the temperature sensor is used to detect ambient temperature. The temperature sensor is arranged on site, and the hot melt device is arranged in the electro-hydraulic actuator.

[0006] The hot melt device includes a valve body and a temperature sensing device, the valve body includes a baffle, a first mounting plate, a second mounting plate, a valve block, and a mounting plate, the temperature sensing device includes a thrust rod, a first connecting metal sheet, a second connecting metal sheet, a housing, and a compression spring, the first mounting plate and the second mounting plate are arranged in parallel on both sides of the valve block, the bottoms of the first mounting plate and the second mounting plate are fixedly connected to the valve block, the tops of the first mounting plate and the second mounting plate are fixedly connected to the mounting plate, and the other end of the housing is fixedly connected to the mounting plate through a thread;

[0007] The baffle is slidably connected to the guide rail, the guide rail is fixedly connected to the mounting plate 2, a through hole is provided on the baffle, the connecting metal sheet 1 and the connecting metal sheet 2 are welded together by hot-melt metal to form a hot-melt metal sheet, one end of the hot-melt metal sheet is fixedly connected to one end of the shell, the other end of the hot-melt metal sheet is fixedly connected to the top end of the thrust rod, the compression spring is sleeved on the outside of the thrust rod, one end of the compression spring abuts against the middle shaft shoulder of the thrust rod, the other end of the compression spring abuts against the mounting plate, and the bottom end of the thrust rod extends into the through hole of the baffle.

[0008] The valve body also includes a valve core, a baffle return spring, and a valve core return spring. The top of the valve core abuts against the bottom surface of the baffle, one end of the baffle return spring abuts against the hole groove of the baffle, and the other end of the baffle return spring abuts against the hole groove of the mounting plate 2. The valve core return spring is sleeved on the outside of the valve core, and the two ends of the valve core return spring abut against the lower surface of the middle shaft shoulder of the valve core and the upper surface of the valve block; the bottom end of the valve core is inserted into the hole of the valve block, and the surface of the valve block is provided with oil port A and oil port B. After the valve core rises, oil port A is connected with oil port B.

[0009] The temperature sensor is connected to the PLC.

[0010] PLC is connected to HMI human-machine interaction screen.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The temperature sensor is connected to the PLC, and the HMI human-machine interactive screen is connected to the PLC. Maintenance personnel can check the on-site ambient temperature at any time through the HMI human-machine interactive screen. If the on-site ambient temperature exceeds the set value, the HMI human-machine interactive screen will alarm and upload it to the central control room, eliminating the need for manual on-site inspections, saving time and effort;

[0013] 2. The hot melt device is provided with a hot melt metal sheet, which is connected between the thrust rod and the housing of the temperature sensing device. While bearing the supporting force of the thrust rod and the housing of the temperature sensing device, when the ambient temperature reaches the melting temperature of the hot melt metal, the hot melt metal sheet can be heated to disconnect the connection between the metal connecting sheet 1 and the metal connecting sheet 2, thereby improving the safety of the use of the electro-hydraulic actuator;

[0014] 3. The bottom end of the thrust rod extends into the through hole, which can effectively prevent the baffle from resetting under the action of the baffle return spring;

[0015] 4. The two ends of the valve core reset spring respectively abut against the lower surface of the shaft shoulder in the middle of the valve core and the upper surface of the valve block, one end of the baffle plate reset spring abuts against the hole groove of the baffle plate, and the other end of the baffle plate reset spring abuts against the hole groove of the second mounting plate, so that when the bottom end of the thrust rod is separated from the baffle plate through hole under the action of the compression spring, it can effectively ensure that the baffle plate slides and resets in the guide rail;

[0016] 5. Use hot melt device and temperature sensor to detect the on-site temperature, which can ensure that when the temperature exceeds the set value, the valve is closed to isolate the storage tank from the outside world. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the front view of the hot melt device.

[0018] Figure 2 It is a side view of the hot melt device.

[0019] Figure 3 It is a schematic diagram of the hydraulic circuit.

[0020] Figure 4 It is the front view of the electro-hydraulic actuator with valve.

[0021] Figure 5 It is a side view of an electro-hydraulic actuator with a valve.

[0022] Figure 6 It is a schematic diagram of the control system of the valve electro-hydraulic actuator.

[0023] In the figure: 1- oil tank 2- support frame 3- motor 4- hot melt device 5- gear pump 6- accumulator 7- oil circuit block 8- valve position sensor 9- oil level sensor 10- pressure sensor 11- actuator cylinder 12- oil tank cover 13- ESD emergency action solenoid valve 14- closing action solenoid valve 15- opening action solenoid valve 16- valve 17- piston rod 18- connecting piece 19- manual plunger hydraulic pump 20- manual pump reversing valve 21- valve stem 41- connecting metal sheet 1 42- connecting metal sheet 2 43- housing 44- thrust rod 45- compression spring 46- mounting plate 47- valve core 48- valve block 49- oil port A 50- oil port B 51 - valve core return spring 52 - baffle return spring 53 - baffle 54 - temperature sensor 59 - valve body 60 - middle shaft shoulder of valve core 61 - guide rail 62 - O-ring 63 - installation plate 1 64 - installation plate 2 65 - middle shaft shoulder of thrust rod 301 - control circuit oil port. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0025] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0026] [Example 1]

[0027] In this embodiment, a temperature control device for a valve electro-hydraulic actuator includes a hot melt device and a temperature sensor 54. The hot melt device is used to respond to the ambient temperature, and the temperature sensor 54 is used to detect the ambient temperature. The temperature sensor 54 is set on site. Figure 6 The temperature sensor 54 is connected to the PLC, and the PLC is connected to the HMI human-machine interaction screen. The maintenance personnel can monitor the data information of the temperature sensor 54 in real time through the HMI human-machine interaction screen without manual on-site inspection.

[0028] See Figures 1 to 5 The hot melt device is arranged in the electro-hydraulic actuator, and the hot melt device includes a valve body 59 and a temperature sensing device. The valve body 59 includes a baffle 53, a mounting plate 1 63, a mounting plate 2 64, a valve block 48, a mounting plate 46, a valve core 47, a baffle return spring 52, and a valve core return spring 51. The temperature sensing device includes a thrust rod 44, a connecting metal sheet 1 41, a connecting metal sheet 2 42, a shell 43, and a compression spring 45. The mounting plate 1 63 and the mounting plate 2 64 are arranged in parallel on both sides of the valve block 48. The bottoms of the mounting plate 1 63 and the mounting plate 2 64 are fixedly connected to the valve block 48, and the tops of the mounting plate 1 63 and the mounting plate 2 64 are fixedly connected to the mounting plate 46. The other end of the shell 43 is fixedly connected to the mounting plate 46 through a thread; The plate 53 is arranged between the two guide rails 61, and the baffle plate 53 can slide along the guide rails 61. The guide rails 61 are fixedly connected to the mounting plate 2 64. A through hole is arranged on the baffle plate 53. The connecting metal sheet 1 41 and the connecting metal sheet 2 42 are welded together by hot-melt metal to form a hot-melt metal sheet. The hot-melt metal sheet is connected between the thrust rod 44 and the shell 43. The working principle of the hot-melt metal sheet is: when the ambient temperature reaches the rated temperature of the hot-melt metal, the hot-melt metal sheet melts, and the connecting metal sheet 1 41 is separated from the connecting metal sheet 2 42; the compression spring 45 is sleeved on the outside of the thrust rod 44, one end of the compression spring 45 abuts against the middle shaft shoulder 65 of the thrust rod, and the other end of the compression spring 45 abuts against the mounting plate 46, and the bottom end of the thrust rod 44 extends into the through hole.

[0029] The top of the valve core 47 abuts against the bottom surface of the baffle plate 53, one end of the baffle plate return spring 52 abuts against the hole groove of the baffle plate 53, and the other end of the baffle plate return spring 52 abuts against the hole groove of the mounting plate 2 64. The valve core return spring 51 is sleeved on the outside of the valve core 47, and the two ends of the valve core return spring 51 abut against the lower surface of the middle shaft shoulder 60 of the valve core and the upper surface of the valve block 48. The bottom end of the valve core 47 is inserted into the hole of the valve block 48. An O-ring 62 is installed in the shaft groove at the bottom end of the valve core 47 to isolate the oil circuit. The surface of the valve block 48 is provided with oil ports A49 and B50 When the valve core 47 is in the normal position (when the top of the valve core 47 is blocked by the baffle plate 53), the oil passages of the oil port A49 and the oil port B50 are isolated by the O-ring 62 at the bottom of the valve core 47. When the valve core 47 rises (that is, after the baffle plate 53 is pushed back by the baffle plate return spring 52, the top of the valve core 47 is pushed back by the valve core return spring 51), the O-ring 62 at the bottom of the valve core 47 is separated from the hole groove at the bottom of the valve block 48, and the oil passages of the oil port A49 and the oil port B50 are connected; the oil port A49 is connected to the accumulator 6, and the oil port B50 is connected to the control circuit oil port 303, see Figure 3 .

[0030] Working process:

[0031] When the temperature of the temperature sensing device reaches the set temperature, the hot-melt metal welded between the connecting metal sheet 1 41 and the connecting metal sheet 2 42 is melted by the heat, and the connecting metal sheet 1 41 is separated from the connecting metal sheet 2 42; the thrust rod 44 is moved upward by the action of the compression spring 45, and the bottom end of the thrust rod 44 is separated from the through hole of the baffle 53. Under the action of the baffle return spring 52, the baffle moves laterally until the valve core 47 can move upward under the action of the valve core return spring 51, so that the oil port A49 and the oil port B50 are connected; the pressure oil of the accumulator 6 can open the pilot check valves 75 and 76 to form a passage through the control oil circuit, and the pressure oil in the accumulator 6 can enter the rod chamber of the actuator cylinder 11 through the pilot check valve 75, and the piston rod 17 of the actuator cylinder 11 pushes the valve stem 21 to close the valve 16. At the same time, the hydraulic oil in the rodless chamber of the actuator cylinder 11 returns to the oil tank 1 through the pilot check valve 76 and the throttle valve 97.

[0032] See Figure 6 A temperature sensor 54 is set on site to detect the ambient temperature on site. When the set temperature is reached, the PLC issues a command to turn on the closing action solenoid valve 14 before the hot melt device 4. The pressure oil in the accumulator 6 can open the pilot check valves 71 and 72 through the control oil circuit to form a passage. The pressure oil in the accumulator 6 can enter the rod chamber of the actuator cylinder 11 through the pilot check valve 71. The piston rod 17 of the actuator cylinder 11 pushes the valve stem 21 to close the valve 16. At the same time, the hydraulic oil in the rodless chamber of the actuator cylinder 11 returns to the oil tank 1 through the pilot check valve 72 and the throttle valve 96. Hot melt device The melting temperature of the hot melt metal in the hot melt device 4 is 70°C, and the temperature sensor 54 can measure the ambient temperature in real time. The warning temperature of the temperature sensor 54 is set lower than the melting temperature of the hot melt metal in the hot melt device 4. The warning temperature of the temperature sensor 54 is 50°C. When the ambient temperature is greater than or equal to 50°C, the PLC issues an environmental high temperature warning. It takes time for the hot melt metal to melt. The temperature sensor 54 can immediately issue a warning when it reaches the warning temperature. However, there is a risk of failure of the temperature sensor 54. When the temperature sensor 54 is damaged, the hot melt metal can melt in a high temperature environment, thereby opening the oil circuit and closing the valve 16.

[0033] The temperature sensor of the utility model is connected with the PLC, and the HMI human-machine interactive screen is connected with the PLC. The maintenance personnel can check the on-site ambient temperature at any time. If the on-site ambient temperature exceeds the set value, the HMI human-machine interactive screen will alarm and upload it to the central control room, without the need for manual on-site inspection, saving time and effort; the hot-melt device is provided with a hot-melt metal sheet, which is connected between the thrust rod and the housing of the temperature sensing device. While bearing the supporting force of the thrust rod and the housing of the temperature sensing device, when the ambient temperature reaches the melting temperature of the hot-melt metal, the hot-melt metal sheet can be heated to disconnect the connection between the metal connecting sheet 1 and the metal connecting sheet 2; The bottom end of the thrust rod extends into the through hole, which can effectively prevent the baffle from resetting under the action of the baffle return spring; the two ends of the valve core return spring respectively abut against the lower surface of the shaft shoulder in the middle of the valve core and the upper surface of the valve block, one end of the baffle return spring abuts against the hole groove of the baffle, and the other end of the baffle return spring abuts against the hole groove of the mounting vertical plate 2, so that when the bottom end of the thrust rod disengages from the baffle through hole under the action of the compression spring, it can effectively ensure that the baffle slides and resets in the guide rail; a hot melt device and a temperature sensor are used to detect the on-site temperature, which can ensure that when the temperature exceeds the set value, the valve is closed to isolate the storage tank from the outside.

Claims

1. A temperature control device for a valve electro-hydraulic actuator, characterized in that: It includes a hot melt device and a temperature sensor, the hot melt device is used to respond to the ambient temperature, the temperature sensor is used to detect the ambient temperature, the temperature sensor is arranged on site, and the hot melt device is arranged in the electro-hydraulic actuator; The hot melt device comprises a valve body and a temperature sensing device, the valve body comprises a baffle, a first mounting plate, a second mounting plate, a valve block, and a mounting plate, the temperature sensing device comprises a thrust rod, a first connecting metal sheet, a second connecting metal sheet, a housing, and a compression spring, the first mounting plate and the second mounting plate are arranged in parallel on both sides of the valve block, the bottoms of the first mounting plate and the second mounting plate are fixedly connected to the valve block, the tops of the first mounting plate and the second mounting plate are fixedly connected to the mounting plate, and the other end of the housing is fixedly connected to the mounting plate through a thread; The baffle is slidably connected to the guide rail, the guide rail is fixedly connected to the mounting plate 2, a through hole is provided on the baffle, the connecting metal sheet 1 and the connecting metal sheet 2 are welded together by hot-melt metal to form a hot-melt metal sheet, one end of the hot-melt metal sheet is fixedly connected to one end of the shell, the other end of the hot-melt metal sheet is fixedly connected to the top end of the thrust rod, the compression spring is sleeved on the outside of the thrust rod, one end of the compression spring abuts against the middle shaft shoulder of the thrust rod, the other end of the compression spring abuts against the mounting plate, and the bottom end of the thrust rod extends into the through hole of the baffle.

2. A temperature control device for a valve electro-hydraulic actuator according to claim 1, characterized in that: The valve body also includes a valve core, a baffle return spring, and a valve core return spring. The top of the valve core abuts against the bottom surface of the baffle, one end of the baffle return spring abuts against the hole groove of the baffle, and the other end of the baffle return spring abuts against the hole groove of the mounting plate 2. The valve core return spring is sleeved on the outside of the valve core, and the two ends of the valve core return spring abut against the lower surface of the middle shaft shoulder of the valve core and the upper surface of the valve block; the bottom end of the valve core is inserted into the hole of the valve block, and the surface of the valve block is provided with oil port A and oil port B. After the valve core rises, oil port A is connected with oil port B.

3. A temperature control device for a valve electro-hydraulic actuator according to claim 1, characterized in that: The temperature sensor is connected to the PLC.

4. A temperature control device for a valve electro-hydraulic actuator according to claim 3, characterized in that: The PLC is connected to the HMI human-machine interaction screen.

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