Displacement detection mechanism for linear reciprocating valves

Abstract

The utility model belongs to the field of valve technology, and discloses a displacement detection mechanism applied to a linear reciprocating motion valve. The displacement detection mechanism is arranged between the valve and the actuator, and includes a displacement sensor, a guide assembly, and a gantry; the measuring head of the displacement sensor is connected to the valve plate of the valve through a fixed bracket, the gantry is arranged on the actuator fixed bracket, and a guide assembly for guiding the displacement sensor is arranged between the upper part of the gantry and the fixed bracket, the bottom of the guide assembly is connected to the valve stem, and the two ends of the valve stem are respectively fixedly connected to the extended end of the actuator and the valve plate; the guide assembly and the valve stem are connected by a supporting connecting rod, and the end of the displacement sensor is connected to the supporting connecting rod. The mechanism has a compact structure and stable operation, the displacement sensor and the valve stem are not entangled or deformed, the operation is convenient, and the detection accuracy is high.

Description

Technical Field

[0001] The utility model belongs to the field of valve technology, and relates to a displacement detection mechanism applied to a linear reciprocating motion valve, and specifically designs a displacement detection mechanism for a linear reciprocating motion valve in a VOCs treatment device. Background Art

[0002] At present, the pneumatic actuators of VOCs treatment equipment generally use linear reciprocating motion to drive the actuators, but there will be a certain amount of air resistance when the actuators or valves move, and the movement stroke of the piston rod will also produce a certain amount of air resistance. The gap between the moving parts caused by air resistance will gradually increase with the increase of use time, thus causing the closing gap of the valve to change, causing the equipment to fail to operate normally.

[0003] Due to the large size, complex structure, bad operating environment, low working efficiency and other factors of the equipment, a single cylinder is usually used to drive multiple actuators to complete the linkage work of the equipment. The structure that uses linear actuator elements (electric cylinder or pneumatic cylinder) to output power to the valve currently uses mechanical limit switches or magnetic induction switches to detect whether the opening / closing is in place. The feedback signal of this detection method is a switch quantity, and the detection range is small. It is specifically reflected in the following points:

[0004] 1. The mechanical limiter is installed on the valve stem of the valve body. Due to the large stroke of the mechanical limiter, it is impossible to accurately judge whether the valve is fully opened or closed. When the valve is not fully closed (there is a gap between the valve plate and the valve seat), it is impossible to accurately judge.

[0005] 2. The magnetic induction switch is installed on the cylinder body. Since it is directly connected to the valve body, when the valve stem or valve power component is broken, the valve operation status cannot be detected. In addition, the detection accuracy of the magnetic induction limit switch is relatively high (1-2mm). After the valve has been running for a long time, the deformation may also cause it to exceed the detection range of the magnetic induction limit switch, causing it to produce a false alarm state, resulting in the corresponding alarm action of the equipment (equipment shutdown or equipment standby).

[0006] The switch detection signal (which can only detect the open and closed positions) is changed into a displacement detection signal, and the displacement offset is calculated by an algorithm, that is, a displacement sensor is used to solve the problems caused by the low-precision measurement of mechanical switches and the high-precision measurement of magnetic induction limit switches. However, in specific applications, the valve will rotate during the linear movement, which will cause the displacement sensor and the valve stem to be entangled or deformed, causing damage to the sensor. It cannot work. Utility Model Content

[0007] The purpose of the utility model is to overcome the deficiencies in the above-mentioned background technology and provide a displacement detection mechanism for a linear reciprocating valve, which has a compact structure and stable operation, and the displacement sensor and the valve stem are not entangled or deformed, and the operation is convenient and the detection accuracy is high.

[0008] The utility model adopts the following technical scheme to solve the technical problems: a displacement detection mechanism applied to a linear reciprocating valve, the displacement detection mechanism is arranged between the valve and the actuator, the displacement detection mechanism comprises a displacement sensor, a guide assembly and a gantry; a measuring head of the displacement sensor is connected to a valve plate of the valve through a fixed bracket, the gantry is arranged on a fixed bracket of the actuator, a guide assembly for guiding the displacement sensor is arranged between the upper part of the gantry and the fixed bracket, the bottom of the guide assembly is connected to a valve stem, and both ends of the valve stem are respectively fixedly connected to an extended end of the actuator and the valve plate; the guide assembly and the valve stem are connected through a supporting connecting rod, and the end of the displacement sensor is connected to the supporting connecting rod.

[0009] The guide assembly includes a track and a pulley block. One end of the track is connected and fixed to a fixed bracket, and the other end is connected and fixed to the top of the gantry through a track seat. The pulley block is arranged on the track and moves back and forth along the track.

[0010] The pulley block comprises two pulleys and a supporting shaft, and the two pulleys are connected via the supporting shaft.

[0011] The track consists of two steel rails, which are arranged in parallel, and a pulley block is arranged between the two steel rails.

[0012] The bottom of the pulley block is fixedly connected to the top of the supporting connecting rod. The bottom of the supporting connecting rod is fixedly connected to the valve stem.

[0013] A limiting collar at the end of the displacement sensor is sleeved on the supporting connecting rod, and the limiting collar is connected to the end of the displacement sensor.

[0014] A metal sheet is provided at the connection between the supporting connecting rod and the valve stem.

[0015] The gantry comprises a support rod and a cross plate; the cross plate is arranged on the top of the support rod, the bottom of the support rod is arranged on the actuator fixing frame, the actuator fixing frame is provided with an adjustment slot, and the bottom of the support rod is positioned in the adjustment slot by bolts.

[0016] The horizontal plate is provided with a horizontal adjustment slot, each support rod is equipped with one, and the support rod is connected to the horizontal plate through a bolt and the adjustment slot. Two support rods are provided.

[0017] The track is connected and fixed with the cross plate through a track seat.

[0018] The displacement sensor is a pull-wire displacement sensor; it can adopt a two-wire system, a three-wire system or a four-wire system, and is not limited to a specific model, as long as its specific working function is achieved.

[0019] The mechanism is also equipped with a PLC control system, which is connected to a displacement sensor and is not limited to a specific model, and can achieve its specific working function.

[0020] The actuator is not a protection point of the utility model, and is a prior art, preferably a cylinder. No special limitation is made.

[0021] The displacement detection mechanism applied to the linear reciprocating motion valve is applied to the lifting valve or the push valve of the VOCs treatment equipment.

[0022] A displacement sensor is used to measure the linear displacement of the valve. The sensor is connected to the valve plate of the valve. As the valve moves, the displacement sensor moves to achieve the purpose of measuring the actual displacement of the valve.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The utility model provides a displacement detection mechanism for linear reciprocating valves, which has a compact structure, the displacement sensor and the valve stem are not entangled or deformed, and the operation is convenient. The installation is simple and flexible, and only simple debugging is required after installation to detect the displacement of the linear reciprocating valve. The position of each point is accurate and firmly fixed, and the displacement of the linear reciprocating valve can be monitored in real time, so that problems can be discovered at any time and handled in a timely manner. The detection accuracy is high and can meet the production process requirements of the industry. The operation is stable, the stability is good, and the operation is reliable, which can ensure the long-term stable operation of the equipment. It has strong versatility and can be adapted to various types of linear travel actuators for use, with high flexibility. It has good detachability when installed on the equipment, and is easy to disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0026] Figure 1 The utility model is a schematic diagram of a displacement detection mechanism applied to a linear reciprocating valve.

[0027] In the figure, 1. fixed bracket, 2. measuring head, 3. track, 4. pulley block, 5. gantry, 6. track seat, 7. supporting link, 8. supporting rod. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0029] Example 1

[0030] A displacement detection mechanism for a linear reciprocating valve, such as Figure 1As shown, the displacement detection mechanism is arranged between the valve and the actuator, and the displacement detection mechanism includes a displacement sensor, a guide component, and a gantry 5; the measuring head 2 of the displacement sensor is connected to the valve plate of the valve through a fixed bracket 1, the gantry 5 is arranged on the actuator fixed bracket, and a guide component for guiding the displacement sensor is arranged between the upper part of the gantry 5 and the fixed bracket 1, the bottom of the guide component is connected to the valve stem, and the two ends of the valve stem are respectively fixedly connected to the protruding end of the actuator and the valve plate; the guide component and the valve stem are connected by a supporting connecting rod 7, and the end of the displacement sensor is connected to the supporting connecting rod 7.

[0031] The guide assembly includes a track 3 and a pulley block 4. One end of the track 3 is connected and fixed to the fixed bracket 1, and the other end is connected and fixed to the top of the gantry 5 through a track seat 6. The pulley block 4 is set on the track 3 and moves back and forth along the track 3.

[0032] The pulley block 4 includes two pulleys and a support shaft, and the two pulleys are connected via the support shaft.

[0033] The track 3 is composed of two steel rails, the two steel rails are arranged in parallel, and the pulley block 4 is arranged between the two steel rails.

[0034] The bottom of the pulley block 3 is fixedly connected to the top of the support connecting rod 7. The bottom of the support connecting rod 7 is fixedly connected to the valve stem.

[0035] A limiting collar at the end of the displacement sensor is sleeved on the supporting connecting rod 7, and the limiting collar is connected to the end of the displacement sensor.

[0036] A metal sheet is provided at the connection between the supporting connecting rod 7 and the valve stem.

[0037] The gantry 5 includes a support rod 8 and a cross plate; the cross plate is arranged on the top of the support rod 8, and the bottom of the support rod 8 is arranged on the actuator fixing frame. The actuator fixing frame is provided with an adjustment groove, and the bottom of the support rod 8 is positioned in the adjustment groove by bolts.

[0038] The horizontal plate is provided with a horizontal adjustment slot, and each support rod 8 is provided with a horizontal adjustment slot, and the support rod 8 is connected to the horizontal plate through bolts and the adjustment slot. Two support rods 8 are provided.

[0039] The track 3 is connected and fixed to the transverse plate via a track seat 6 .

[0040] The displacement sensor is a pull-wire displacement sensor; it can adopt a two-wire system, a three-wire system or a four-wire system, and is not limited to a specific model, as long as its specific working function is achieved.

[0041] The mechanism is also equipped with a PLC control system, which is connected to a displacement sensor and is not limited to a specific model, and can achieve its specific working function.

[0042] The actuator is not a protection point of the utility model, and is a prior art, preferably a cylinder. No special limitation is made.

[0043] During specific operation, first place the support rod 8 on the gantry 5 on the adjustment groove on the surface of the actuator fixing frame according to the cylinder size of the actuator set for the corresponding working condition, determine the position according to the working condition, and fix the support rod 8 in place by bolts. The cross plate on the top of the support rod 8 is positioned by bolts and the horizontal adjustment groove. Then install other parts. During specific operation, the extended end of the actuator cylinder moves forward, thereby driving the valve stem to move, and the support connecting rod 7 on the valve stem moves along with it. The measuring head 2 of the displacement sensor does not move, but the end limit ring of the wire displacement sensor moves with the support connecting rod 7, which can detect the actual valve stem displacement distance. During movement, the track 3 and pulley group 4 set on the top of the support connecting rod 7 limit the guiding effect of the wire displacement sensor as a whole. Under the fixed support effect, the measuring head 2 can always be in parallel to the axial straight line, and measurement winding will not occur.

[0044] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A displacement detection mechanism for a linear reciprocating valve, characterized in that: The displacement detection mechanism is arranged between the valve and the actuator, and comprises a displacement sensor, a guide assembly, and a gantry (5); the measuring head (2) of the displacement sensor is connected to the valve plate of the valve via a fixed bracket (1); the gantry (5) is arranged on the actuator fixed bracket; a guide assembly for guiding the displacement sensor is arranged between the upper part of the gantry (5) and the fixed bracket (1); the bottom of the guide assembly is connected to the valve stem; the two ends of the valve stem are respectively fixedly connected to the protruding end of the actuator and the valve plate; the guide assembly and the valve stem are connected via a supporting connecting rod (7); the end of the displacement sensor is connected to the supporting connecting rod (7).

2. A displacement detection mechanism for a linear reciprocating valve as claimed in claim 1, characterized in that: The guide assembly comprises a track (3) and a pulley block (4); one end of the track (3) is connected and fixed to a fixed bracket (1), and the other end is connected and fixed to the top of a gantry (5) via a track seat (6); the pulley block (4) is arranged on the track (3) and moves back and forth in a straight line along the track (3).

3. A displacement detection mechanism for a linear reciprocating valve as claimed in claim 1, characterized in that: The gantry (5) comprises a support rod (8) and a cross plate; the cross plate is arranged on the top of the support rod (8), the bottom of the support rod (8) is arranged on an actuator fixing frame, an adjustment slot is provided on the actuator fixing frame, and the bottom of the support rod (8) is positioned in the adjustment slot by means of bolts.

4. A displacement detection mechanism for a linear reciprocating valve as claimed in claim 2, characterized in that: The pulley block (4) comprises two pulleys and a supporting shaft, and the two pulleys are connected via the supporting shaft.

5. A displacement detection mechanism for a linear reciprocating valve as claimed in claim 2, characterized in that: The track (3) is composed of two steel rails, the two steel rails are arranged in parallel, and the pulley block (4) is arranged between the two steel rails.

6. A displacement detection mechanism for a linear reciprocating valve as claimed in claim 2, characterized in that: The bottom of the pulley block (4) is connected and fixed to the top of the supporting connecting rod (7).

7. A displacement detection mechanism for a linear reciprocating valve as claimed in claim 6, characterized in that: The bottom of the supporting connecting rod (7) is fixedly connected to the valve stem.

8. A displacement detection mechanism for a linear reciprocating valve as claimed in claim 6, characterized in that: A limiting collar at the end of the displacement sensor is sleeved on the supporting connecting rod (7), and the limiting collar is connected to the end of the displacement sensor.

9. A displacement detection mechanism for a linear reciprocating valve according to any one of claims 1 to 8, characterized in that: The displacement sensor is a draw-wire displacement sensor.

10. A displacement detection mechanism for a linear reciprocating valve according to any one of claims 1 to 8, characterized in that: A metal sheet is provided at the connection between the supporting connecting rod (7) and the valve stem.

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