Control valve with safety position monitoring function

Abstract

The utility model relates to control valve technical field discloses a control valve with safe position monitoring function, the control valve of the utility model, include: valve body, valve core, coil, proximity switch, logic circuit and output pin, valve core sets up in the valve cavity of valve body, coil A and coil B set up in the left side and right side of valve body, proximity switch A and proximity switch B set up in the left side and right side of valve body, and proximity switch is connected with logic circuit, and logic circuit is connected with output pin. The control valve of the utility model, coil promotes valve core to slide when getting electricity, and proximity switch A and proximity switch B output high level signal when detecting valve core, and logic circuit according to the level signal output of proximity switch A and proximity switch B the position signal of valve core in valve body, tell whether valve core is in left side terminal, right side terminal and the safe position of mid -position, this safety signal provides for safety module or other safety execution system uses, realizes the monitoring of valve core safe position.

Description

Technical Field

[0001] This utility model relates to the field of control valve technology, specifically to a control valve with a safe position monitoring function. Background Technology

[0002] A hydraulic control system is based on an electric motor as the power source. It uses a hydraulic pump to convert mechanical energy into pressure, which drives hydraulic oil. By controlling various valves to change the flow direction of the hydraulic oil, it drives the hydraulic cylinder to make different strokes and directions of movement, thus completing the different action requirements of various equipment.

[0003] A directional control valve is a commonly used control element in hydraulic systems. The valve spool slides within the valve body and valve cavity. By changing the relative position between the valve spool and valve body, it controls the direction of oil flow, opening or closing the oil circuit, thereby changing the working state of the hydraulic transmission system and enabling the forward and reverse rotation of actuators such as hydraulic cylinders or hydraulic motors. The core components of a directional control valve are the valve spool and valve body. The valve spool moves within the valve body, and the oil circuit connecting the hydraulic cylinder or hydraulic motor changes depending on the position of the valve spool within the valve body. For example, when the valve spool is in the middle position, oil cannot flow; when it is at one end of the valve body, oil flows to one side of the hydraulic cylinder, causing it to operate. Directional control valves typically contain a spring for resetting the valve spool. When the drive system no longer applies pressure, the spring pushes the valve spool back to its initial neutral position, closing the valve body and cutting off oil flow.

[0004] Taking a three-position four-way directional valve as an example, its working principle is as follows: When the spool valve (valve core) is in the middle position of the valve body, the two shoulders of the spool valve seal the A and B oil ports of the valve body and isolate the inlet and return oil ports P and T of the valve body. The directional valve prevents the supply of pressurized oil to the actuator, and the actuator does not work. When the spool valve is in the left position, pressurized oil enters the valve body from port P, passes through port A to the actuator, and the oil flowing back from the actuator enters the valve body through port B and flows back to the oil tank through the return oil port T. The actuator moves in a certain specified direction under the action of pressurized oil. When the spool valve is in the right position, pressurized oil passes through ports P and B to the actuator, and the return oil flows back to the oil tank through ports A and T. The actuator moves in the opposite direction under the action of pressurized oil.

[0005] The inventors of this application have discovered that the spool structure of the directional control valve can cause the valve core to become stuck during directional movement, preventing it from reaching the safe left end (end A) or right end (end B), resulting in changes in output pressure and flow. Furthermore, when closing, the valve core may become stuck and fail to return to the safe neutral position, leaving the valve body still in operation and posing a safety hazard to the actuator. Therefore, how to monitor whether the valve core is in a safe position is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a control valve with a safe position monitoring function to solve the problems mentioned in the background art.

[0007] This utility model embodiment provides a control valve with a safe position monitoring function, including: a valve body, a valve core, a coil, a proximity switch, a logic circuit, and an output pin;

[0008] The valve core is slidably disposed in the valve cavity of the valve body, and is used to control the hydraulic oil in the valve cavity to flow out from port A or port B of the valve body. When the valve core is in the middle position of the valve body, both ports A and B of the valve body are closed.

[0009] The coil includes: coil A and coil B;

[0010] The coil A and the coil B are respectively disposed on the left and right sides of the valve body, and the coil is used to push the valve core to slide when energized;

[0011] The proximity switch includes: proximity switch A and proximity switch B;

[0012] The proximity switch A and the proximity switch B are respectively disposed on the left and right sides of the valve body. The output terminals of the proximity switches A and B are respectively connected to the input terminals of the logic circuit. The output terminal of the logic circuit is connected to the output pin. The proximity switches A and B are used to output a high-level signal when the valve core is detected to have reached a preset position. The logic circuit is used to output the position information of the valve core according to the level signal of the proximity switches.

[0013] Based on the above scheme, the control valve with safe position monitoring function of this utility model, by setting a valve body, valve core, coil, proximity switch, logic circuit, and output pin, allows the valve core to be slidably disposed within the valve cavity of the valve body. The coil includes coil A and coil B, which are respectively disposed on the left and right sides of the valve body. The proximity switch includes proximity switch A and proximity switch B, which are respectively disposed on the left and right sides of the valve body. The output terminals of proximity switches A and B are respectively connected to the input terminals of the logic circuit, and the output terminal of the logic circuit is connected to the output pin. In this control valve with safe position monitoring function, the valve core is slidably disposed within the valve cavity of the valve body. When the coil is energized, it pushes the valve core to slide. When proximity switches A and B detect that the valve core has reached a preset position, they output corresponding high-level signals. The logic circuit outputs the position signal of the valve core within the valve body based on the level signals output by proximity switches A and B, indicating whether the valve core is in a safe position of left end, right end, or center. This position signal can be provided to the system safety module or other safety execution systems to achieve safe position monitoring of the valve core.

[0014] In one feasible solution, the logic circuit is mounted on a PCB board;

[0015] The PCB board is mounted on the valve body via a housing;

[0016] The output pin is located on the housing and is connected to the logic circuit.

[0017] In one feasible solution, the proximity switch is an inductive proximity switch that outputs a high-level signal when it senses metal on the valve core.

[0018] One feasible solution also includes: a temperature control switch;

[0019] The temperature control switch is mounted on the logic circuit and is used to disconnect the logic circuit when the temperature exceeds a threshold.

[0020] In one feasible solution, the output pins include: Pin3, Pin4, and Pin5;

[0021] The logic circuit includes: a first NOT gate, a first NAND gate, a second NOT gate, a second NAND gate, and an OR NOT gate;

[0022] The first NOT gate and the first NAND gate are connected in series, and the second NOT gate and the second NAND gate are connected in series;

[0023] The proximity switch A is connected to the input terminals of the first NOT gate, the second NAND gate, and the NOR gate;

[0024] The proximity switch B is connected to the input terminals of the second NOT gate, the first NAND gate, and the NOR gate;

[0025] The outputs of the first NAND gate, the second NAND gate, and the NOR gate are respectively connected to Pin 3, Pin 4, and Pin 5;

[0026] When the valve core is in the left terminal, right terminal, and middle position, Pin3, Pin4, and Pin5 respectively output a high level.

[0027] In one feasible solution, the output pins include: Pin3 and Pin4;

[0028] The logic circuit includes: a first NOT gate, a first NAND gate, a second NOT gate, and a second NAND gate;

[0029] The first NOT gate and the first NAND gate are connected in series, and the second NOT gate and the second NAND gate are connected in series;

[0030] The proximity switch A is connected to the input terminals of the first NOT gate and the second NAND gate;

[0031] The proximity switch B is connected to the input terminals of the second NOT gate and the first NAND gate;

[0032] The outputs of the first NAND gate and the second NAND gate are connected to Pin3 and Pin4, respectively.

[0033] When the valve core is at the left and right terminals, Pin3 and Pin4 respectively output a high level.

[0034] In one feasible solution, the output pin includes: Pin5;

[0035] The logic circuit includes: an AND gate;

[0036] Both proximity switch A and proximity switch B are connected to the input terminal of the AND gate, and the output terminal of the AND gate is connected to Pin 5;

[0037] When the valve core is in the neutral position and both proximity switches A and B detect the valve core, Pin 5 outputs a high level.

[0038] In one feasible solution, the output pins include: Pin4 and Pin5;

[0039] The logic circuit includes: AND gate, NOT gate, and NAND gate;

[0040] The NOT gate and the NAND gate are connected in series;

[0041] The proximity switch A is connected to the input terminals of the AND gate and the NAND gate;

[0042] The proximity switch B is connected to the input terminals of the AND gate and the NOT gate;

[0043] The outputs of the AND gate and the NAND gate are respectively connected to Pin 5 and Pin 4;

[0044] When the valve core is in the middle position and the right end, Pin5 and Pin4 respectively output a high level.

[0045] In one feasible solution, the output pins include: Pin3 and Pin5;

[0046] The logic circuit includes: NOT gate, NAND gate, and AND gate;

[0047] The NOT gate and the NAND gate are connected in series;

[0048] The proximity switch A is connected to the input terminals of the NOT gate and the AND gate;

[0049] The proximity switch B is connected to the input terminals of the AND gate and the NAND gate;

[0050] The output terminals of the NAND gate and the AND gate are respectively connected to Pin3 and Pin5;

[0051] When the valve core is in the left terminal and middle position, Pin3 and Pin5 respectively output a high level. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 based on these drawings without creative effort.

[0053] Figure 1 This is a schematic diagram of a control valve with a safe position monitoring function in an embodiment of the present invention;

[0054] Figure 2 This is a schematic diagram of the output pins in an embodiment of the present invention;

[0055] Figure 3 This is a schematic diagram of the logic circuit in Embodiment 1 of this utility model;

[0056] Figure 4 This is a schematic diagram of the logic circuit in Embodiment 2 of this utility model;

[0057] Figure 5 This is a schematic diagram of the logic circuit in Embodiment 3 of this utility model;

[0058] Figure 6 This is a schematic diagram of the logic circuit in Embodiment 4 of this utility model;

[0059] Figure 7 This is a schematic diagram of the logic circuit in Embodiment 5 of this utility model.

[0060] Numbering on the map:

[0061] 1. Valve body; 2. Valve core; 31. Coil A; 32. Coil B; 41. Proximity switch A; 42. Proximity switch B; 5111. First NOT gate; 5112. Second NOT gate; 5121. First NAND gate; 5122. Second NAND gate; 513. NOR gate; 5211. First NOT gate; 5212. Second NOT gate; 5221. First NAND gate; 5222. Second NAND gate; 534. AND gate; 541. NOT gate; 542. NAND gate; 544. AND gate; 551. NOT gate; 552. NAND gate; 554. AND gate; 6. Output pin; 71. PCB board; 72. Box. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0063] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", 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 are not intended to 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 of this utility model.

[0064] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0066] As described in the background section of this application, a directional valve is a control element in a hydraulic system. By changing the relative position between the valve core and the valve body, it controls the direction of oil flow, connects or closes the oil circuit, thereby changing the working state of the hydraulic transmission system and realizing the forward and reverse rotation of the hydraulic cylinder or hydraulic motor.

[0067] The inventors of this application have discovered that the spool structure of the directional control valve can cause the valve core to become stuck during directional movement, preventing it from reaching the safe left end (end A) or right end (end B), resulting in changes in output pressure and flow. Furthermore, when closing, the valve core may become stuck and fail to return to the safe neutral position, leaving the valve body still in operation and posing a safety hazard to the actuator. Therefore, how to monitor whether the valve core is in a safe position is a technical problem that urgently needs to be solved by those skilled in the art.

[0068] To address the aforementioned problems, the inventors of this application have proposed a technical solution, the specific embodiments of which are as follows:

[0069] Figure 1 This is a schematic diagram of a control valve with a safe position monitoring function according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the output pins in an embodiment of the present invention.

[0070] like Figure 1 and Figure 2 As shown, the control valve with safe position monitoring function in this embodiment includes: valve body 1, valve core 2, coil, proximity switch, logic circuit and output pin 6.

[0071] The valve body 1 is provided with a valve cavity, working oil port A (A port), working oil port B (B port), oil inlet and oil return port, and working oil port A, working oil port B, oil inlet and oil return port are respectively connected to the valve cavity.

[0072] The valve core 2 is slidably disposed in the valve cavity of the valve body 1. It can move between the left end (A end) and the middle position of the valve body 1, and between the middle position and the right end (B end) to control the flow of hydraulic oil in the valve cavity from port A (working port A) or port B (working port B) of the valve body 1 to the actuator. When the valve core 2 is in the middle position of the valve body 1, the valve core 2 closes both ports A and B of the valve body 1, and the actuator does not work.

[0073] There are two coils: coil A31 and coil B32.

[0074] Coil A31 and coil B32 are mounted on valve body 1, located on the left and right sides of valve body 1 respectively, and are connected to an external power source. When coil A31 is energized, it pushes valve core 2 to slide to the right side (end B) of valve body 1, and when coil B32 is energized, it pushes valve core 2 to slide to the left side (end A) of valve body 1.

[0075] There are also two proximity switches, namely proximity switch A41 and proximity switch B42.

[0076] Proximity switches A41 and B42 are mounted on valve body 1, located on the left and right sides respectively. Proximity switch A41 and coil A31 are positioned on the same side (left end) of valve body 1, while proximity switch B42 and coil B32 are positioned on the same side (right end). The outputs of proximity switches A41 and B42 are electrically connected to the inputs of a logic circuit, and the output of the logic circuit is electrically connected to an output pin. The coil pushes valve core 2 to move within valve body 1. Proximity switches A41 and B42 detect the position of valve core 2 within valve body 1 and output corresponding level signals based on the different positions of valve core 2. The logic circuit, based on the level signals output by proximity switches A41 and B42, outputs the position information of valve core 2 within valve body 1 via output pin 6, informing whether valve core 2 is in a safe position, thus achieving safe position monitoring of valve core 2.

[0077] In this embodiment, when coil A is energized, it pushes the valve core to move to the right end. When it reaches the right end (end B), proximity switch B detects the valve core and outputs a high level, while proximity switch A outputs a low level.

[0078] When coil B is energized, it pushes the valve core to move to the left. When it reaches the left end (end A), proximity switch A detects the valve core and goes high. At this time, proximity switch B outputs a low level.

[0079] When neither coil A nor coil B is energized, the valve core remains stationary in the neutral position, and both proximity switches A and B output a low level.

[0080] The output pins of the logic circuit output a corresponding level signal after logical operation based on the level signals output by proximity switches A and B, informing the valve core of its position within the valve body, i.e. whether the valve core is in a safe position.

[0081] As can be seen from the above, the control valve with safe position monitoring function in this embodiment comprises a valve body, a valve core, a coil, a proximity switch, a logic circuit, and an output pin. The valve core is slidably disposed within the valve cavity of the valve body. The coil includes coil A and coil B, which are respectively disposed on the left and right sides of the valve body. The proximity switch includes proximity switch A and proximity switch B, which are respectively disposed on the left and right sides of the valve body. The output terminals of proximity switches A and B are respectively connected to the input terminals of the logic circuit, and the output terminal of the logic circuit is connected to the output pin. In this control valve with safe position monitoring function, the valve core is slidably disposed within the valve cavity of the valve body. When the coil is energized, it pushes the valve core to slide. When proximity switches A and B detect that the valve core has reached a preset position, they output corresponding level signals. The logic circuit outputs the position signal of the valve core within the valve body based on the level signals output by proximity switches A and B, indicating whether the valve core is in a safe position such as the left end, right end, or center position. This position signal can be provided to the system safety module or other safety execution systems to achieve safe position monitoring of the valve core.

[0082] Optionally, in this embodiment, the logic circuit of the control valve with safe position monitoring function is set on PCB board 71 (printed circuit board).

[0083] PCB board 71 is installed inside box 72, and box 72 is installed on valve body 1.

[0084] Output pin 6 is located on housing 72 and is electrically connected to the output terminal of the logic circuit.

[0085] In this embodiment, the logic circuit is mounted on a PCB board, which is mounted on the valve body via a housing. This facilitates the installation of the logic circuit on the valve body and also makes it easy to replace the logic circuit to adapt to different control requirements.

[0086] Furthermore, in this embodiment, the control valve with safe position monitoring function uses inductive proximity switches (proximity switch A31 and proximity switch B32).

[0087] The valve core 2 slides left and right inside the valve body 1. When the valve core 2 reaches the preset position, the proximity switches (proximity switch A31 and proximity switch B32) output a high level when they detect a metal object on the valve core 2, otherwise they output a low level.

[0088] Optionally, the control valve with safe position monitoring function in this embodiment also includes a temperature control switch.

[0089] The temperature control switch (not shown in the figure) is set on the logic circuit and is used to disconnect the logic circuit when the temperature exceeds the threshold.

[0090] In this embodiment, since electronic devices generate heat during operation, a temperature control switch monitors the temperature of the logic circuit on the PCB board. When the temperature exceeds a set threshold, the temperature control switch disconnects the logic circuit to ensure the safety of the circuit board and electronic devices.

[0091] Example 1

[0092] Figure 3 This is a schematic diagram of the logic circuit in Embodiment 1 of this utility model.

[0093] like Figure 3 As shown, the control valve with safe position monitoring function in this embodiment has output pins 6 including: Pin3, Pin4 and Pin5.

[0094] The logic circuit includes: a first NOT gate 5111, a first NAND gate 5121, a second NOT gate 5112, a second NAND gate 5122, and an OR NOT gate 513.

[0095] The output of the first NOT gate 5111 and the input of the first NAND gate 5121 are connected in series, and the output of the second NOT gate 5112 and the input of the second NAND gate 5122 are connected in series.

[0096] The output terminal of proximity switch A is electrically connected to the input terminal of the first NOT gate 5111, the input terminal of the second NAND gate 5122, and the input terminal of the NOR gate 513.

[0097] The output terminal of proximity switch B is electrically connected to the input terminal of the second NOT gate 5112, the input terminal of the first NAND gate 5121, and the input terminal of the NOR gate 513.

[0098] The output of the first NAND gate 5121 is electrically connected to Pin 3 of output pin 6, the output of the second NAND gate 5122 is electrically connected to Pin 4 of output pin 6, and the output of the NOR gate 513 is electrically connected to Pin 5 of output pin 6.

[0099] In this embodiment, the logic circuit enables monitoring of three safe positions: A-end, B-end, and the middle position, making it suitable for scenarios where monitoring of all three safe positions is required.

[0100] 1. When coil A is energized, the valve core moves towards B until it reaches the end. Proximity switch B detects metal and outputs a high level. Pin 4 outputs a high level.

[0101] 2. When coil B is energized, the valve core moves towards A until it reaches the end. Proximity switch A detects metal and outputs a high level, and pin 3 outputs a high level.

[0102] 3. Neither coil A nor coil B is energized, the valve core is stationary in the neutral position, and pin 5 outputs a high level.

[0103] Coil A OFF OFF ON Coil B ON OFF OFF Proximity switch A ON ON OFF Proximity switch B OFF ON ON Pin3 ON OFF OFF Pin4 OFF OFF ON Pin5 OFF ON OFF

[0104] In this context, ON represents a high level and OFF represents a low level.

[0105] Example 2

[0106] Figure 4 This is a schematic diagram of the logic circuit in Embodiment 2 of the present invention. Embodiment 2 is an alternative to Embodiment 1.

[0107] like Figure 4 As shown, the control valve with safe position monitoring function in this embodiment has output pins 6 including Pin3 and Pin4.

[0108] The logic circuit includes: a first NOT gate 5211, a first NAND gate 5221, a second NOT gate 5212, and a second NAND gate 5222.

[0109] The output of the first NOT gate 5211 and the input of the first NAND gate 5221 are connected in series, and the output of the second NOT gate 5212 and the input of the second NAND gate 5222 are connected in series.

[0110] The output terminal of proximity switch A is connected to the input terminal of the first NOT gate 5211, and the output terminal of proximity switch A is connected to the input terminal of the second NAND gate 5222.

[0111] The output terminal of proximity switch B is connected to the input terminal of the second NOT gate 5212, and the output terminal of proximity switch B is connected to the input terminal of the first NAND gate 5221.

[0112] The output of the first NAND gate 5221 is connected to pin 3 of output pin 6, and the output of the second NAND gate 5222 is connected to pin 4 of output pin 6.

[0113] In this embodiment, the monitoring of two safe locations, A and B, can be achieved through logic circuits, which is suitable for scenarios that require monitoring of two safe locations, A and B.

[0114] 1. When coil A is energized, the valve core moves towards B until it reaches the end. Proximity switch B detects metal and outputs a high level. Pin 4 outputs a high level.

[0115] 2. When coil B is energized, the valve core moves towards A until it reaches the end. Proximity switch A detects metal and outputs a high level, and pin 3 outputs a high level.

[0116] Coil A OFF OFF ON Coil B ON OFF OFF Proximity switch A ON OFF OFF Proximity switch B OFF OFF ON Pin3 ON OFF OFF Pin4 OFF OFF ON

[0117] In this context, ON represents a high level and OFF represents a low level.

[0118] Example 3

[0119] Figure 5 This is a schematic diagram of the logic circuit in Embodiment 3 of the present invention. Embodiment 3 is another alternative to Embodiment 1.

[0120] like Figure 5 As shown, the control valve with safe position monitoring function in this embodiment has an output pin 6 including: Pin 5.

[0121] The logic circuit includes: AND gate 534.

[0122] The output of proximity switch A is connected to the input of AND gate 534, the output of proximity switch B is also connected to the input of AND gate 534, and the output of AND gate 534 is connected to pin 5 of output pin 6.

[0123] In this embodiment, the monitoring of the center safety position can be realized through logic circuits, which is suitable for scenarios where only the center safety position needs to be monitored.

[0124] When neither coil A nor coil B is energized, the valve core is in the neutral position, and both proximity switches A and B detect the metal of the valve core, PIN 5 outputs a high level; otherwise, it outputs a low level.

[0125] Coil A OFF OFF ON Coil B ON OFF OFF Proximity switch A ON ON OFF Proximity switch B OFF ON ON Pin5 OFF ON OFF

[0126] In this context, ON represents a high level and OFF represents a low level.

[0127] Example 4

[0128] Figure 6 This is a schematic diagram of the logic circuit in Embodiment 4 of the present invention. Embodiment 4 is another alternative to Embodiment 1.

[0129] like Figure 6 As shown, the control valve with safe position monitoring function in this embodiment has output pins 6 including Pin4 and Pin5.

[0130] The logic circuits include: AND gate 544, NOT gate 541 and NAND gate 542.

[0131] The output of NOT gate 541 and the input of NAND gate 542 are connected in series.

[0132] The output of proximity switch A is connected to the input of AND gate 544, and the output of proximity switch A is connected to the input of NAND gate 542.

[0133] The output of proximity switch B is connected to the input of AND gate 544, and the output of proximity switch B is connected to the input of NOT gate 541.

[0134] The output of AND gate 544 is electrically connected to pin 5 of output pin 6, and the output of NAND gate 542 is electrically connected to pin 4 of output pin 6.

[0135] In this embodiment, the monitoring of the center position and the B-end safety position can be realized through logic circuits, which is suitable for scenarios that require monitoring of the center position and the B-end safety position.

[0136] 1. When coil A is energized, the valve core moves towards B until it reaches the end. Proximity switch B detects metal and outputs a high level. Pin 4 outputs a high level.

[0137] 2. Neither coil A nor B is energized, the valve core is in the neutral position, and the PIN5 pin outputs a high level.

[0138] Coil A OFF OFF ON Coil B ON OFF OFF Proximity switch A ON ON OFF Proximity switch B OFF ON ON Pin4 OFF OFF ON Pin5 OFF ON OFF

[0139] In this context, ON represents a high level and OFF represents a low level.

[0140] Example 5

[0141] Figure 7 This is a schematic diagram of the logic circuit in Embodiment 5 of the present invention. Embodiment 5 is another alternative to Embodiment 1.

[0142] like Figure 7 As shown, the control valve with safe position monitoring function in this embodiment has output pins 6 including Pin3 and Pin5.

[0143] The logic circuits include: NOT gate 551, NAND gate 552 and AND gate 554.

[0144] The output of NOT gate 551 and the input of NAND gate 552 are connected in series.

[0145] The output terminal of proximity switch A is connected to the input terminal of NOT gate 551, and the output terminal of proximity switch A is connected to the input terminal of AND gate 554.

[0146] The output of proximity switch B is connected to the input of NAND gate 552, and the output of proximity switch B is connected to the input of AND gate 554.

[0147] The output of NAND gate 552 is connected to pin 3 of output pin 6, and the output of AND gate 554 is connected to pin 5 of output pin 6.

[0148] In this embodiment, the monitoring of end A and the middle safe position can be realized through logic circuits, which is suitable for scenarios that require monitoring of end A and the middle safe position.

[0149] 1. When coil B is energized, the valve core moves towards A until it reaches the end. Proximity switch A detects metal and outputs a high level, and pin 3 outputs a high level.

[0150] 2. Neither coil A nor B is energized, the valve core is in the neutral position, and the PIN5 pin outputs a high level.

[0151]

[0152]

[0153] In this context, ON represents a high level and OFF represents a low level.

[0154] In this utility model, unless otherwise explicitly specified and limited, the first feature being "on" or "below" the second feature can mean that the first feature and the second feature are in direct contact, or that the first feature and the second feature are in indirect contact through an intermediate medium.

[0155] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "under," and "beneath" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0156] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0157] 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 control valve with a safe position monitoring function, characterized in that, include: Valve body, valve core, coil, proximity switch, logic circuit, and output pins; The valve core is slidably disposed in the valve cavity of the valve body, and is used to control the hydraulic oil in the valve cavity to flow out from port A or port B of the valve body. When the valve core is in the middle position of the valve body, both ports A and B of the valve body are closed. The coil includes: coil A and coil B; The coil A and the coil B are respectively disposed on the left and right sides of the valve body, and the coil is used to push the valve core to slide when energized; The proximity switch includes: proximity switch A and proximity switch B; The proximity switch A and the proximity switch B are respectively disposed on the left and right sides of the valve body. The output terminals of the proximity switches A and B are respectively connected to the input terminals of the logic circuit. The output terminal of the logic circuit is connected to the output pin. The proximity switches A and B are used to output a high-level signal when the valve core is detected to have reached a preset position. The logic circuit is used to output the position information of the valve core according to the level signal of the proximity switches.

2. The control valve with safe position monitoring function according to claim 1, characterized in that, The logic circuit is mounted on the PCB board; The PCB board is mounted on the valve body via a housing; The output pin is located on the housing and is connected to the logic circuit.

3. The control valve with safe position monitoring function according to claim 2, characterized in that, The proximity switch is an inductive proximity switch that outputs a high-level signal when it senses metal on the valve core.

4. The control valve with safe position monitoring function according to claim 1, characterized in that, Also includes: Temperature control switch; The temperature control switch is mounted on the logic circuit and is used to disconnect the logic circuit when the temperature exceeds a threshold.

5. The control valve with safe position monitoring function according to any one of claims 1 to 4, characterized in that, The output pins include: Pin3, Pin4 and Pin5; The logic circuit includes: a first NOT gate, a first NAND gate, a second NOT gate, a second NAND gate, and an OR NOT gate; The first NOT gate and the first NAND gate are connected in series, and the second NOT gate and the second NAND gate are connected in series; The proximity switch A is connected to the input terminals of the first NOT gate, the second NAND gate, and the NOR gate; The proximity switch B is connected to the input terminals of the second NOT gate, the first NAND gate, and the NOR gate; The outputs of the first NAND gate, the second NAND gate, and the NOR gate are respectively connected to Pin 3, Pin 4, and Pin 5; When the valve core is in the left terminal, right terminal, and middle position, Pin3, Pin4, and Pin5 respectively output a high level.

6. The control valve with safe position monitoring function according to any one of claims 1 to 4, characterized in that, The output pins include: Pin3 and Pin4; The logic circuit includes: a first NOT gate, a first NAND gate, a second NOT gate, and a second NAND gate; The first NOT gate and the first NAND gate are connected in series, and the second NOT gate and the second NAND gate are connected in series; The proximity switch A is connected to the input terminals of the first NOT gate and the second NAND gate; The proximity switch B is connected to the input terminals of the second NOT gate and the first NAND gate; The outputs of the first NAND gate and the second NAND gate are connected to Pin3 and Pin4, respectively. When the valve core is at the left and right terminals, Pin3 and Pin4 respectively output a high level.

7. The control valve with safe position monitoring function according to any one of claims 1 to 4, characterized in that, The output pin includes: Pin5; The logic circuit includes: an AND gate; Both proximity switch A and proximity switch B are connected to the input terminal of the AND gate, and the output terminal of the AND gate is connected to Pin 5; When the valve core is in the neutral position and both proximity switches A and B detect the valve core, Pin 5 outputs a high level.

8. The control valve with safe position monitoring function according to any one of claims 1 to 4, characterized in that, The output pins include: Pin4 and Pin5; The logic circuit includes: AND gate, NOT gate, and NAND gate; The NOT gate and the NAND gate are connected in series; The proximity switch A is connected to the input terminals of the AND gate and the NAND gate; The proximity switch B is connected to the input terminals of the AND gate and the NOT gate; The outputs of the AND gate and the NAND gate are respectively connected to Pin 5 and Pin 4; When the valve core is in the middle position and the right end, Pin5 and Pin4 respectively output a high level.

9. The control valve with safe position monitoring function according to any one of claims 1 to 4, characterized in that, The output pins include: Pin3 and Pin5; The logic circuit includes: NOT gate, NAND gate, and AND gate; The NOT gate and the NAND gate are connected in series; The proximity switch A is connected to the input terminals of the NOT gate and the AND gate; The proximity switch B is connected to the input terminals of the AND gate and the NAND gate; The output terminals of the NAND gate and the AND gate are respectively connected to Pin3 and Pin5; When the valve core is in the left terminal and middle position, Pin3 and Pin5 respectively output a high level.

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