Furnace pressure control device of annealing furnace

Abstract

The utility model relates to the field of annealing furnaces, in particular to a furnace pressure control device of an annealing furnace, which is characterized in that an extending end of a rotating shaft of a gate valve is fixedly connected with a locking device, one end of a feedback connecting rod is fixedly connected with a valve positioner, and the other end of the feedback connecting rod is hinged with the locking device; a piston rod of the air cylinder is hinged to the locking device, and the valve positioner is connected with the electric cabinet. The furnace pressure control device of the annealing furnace has the advantages that an IP converter is not needed, the failure rate is reduced, and the production safety is improved; the interior of the valve positioner is cooled through compressed air, the working temperature of the valve positioner is reduced, the service life is prolonged, and the failure rate is reduced; the cylinder is connected with the flashboard through the locking device, the cylinder can conveniently drive the flashboard to act, the locking device is of a split structure, and maintenance personnel can conveniently maintain and disassemble the flashboard; the device is reasonable in design, simple in structure, convenient to use, low in cost, low in investment cost and simple to maintain.

Description

TECHNICAL FIELD

[0001] The utility model relates to annealing furnace field especially relates to a kind of annealing furnace pressure control device. BACKGROUND

[0002] In the non-oxidizing heating section of improved Sendzimir method, according to process requirements, gate is usually used at flue mouth to adjust the pressure in the furnace by combining with the suction of exhaust fan, to ensure that the furnace is slightly positive pressure, so that the surface of steel plate is not oxidized. To realize the adjustment of furnace pressure, the gate is installed in the exhaust pipe at present, and the pressure detected by the furnace pressure detection device is fed back to the electric control system during production, and the electric control system sends the pressure signal to the pneumatic valve control mechanism through IP converter, and the rotation of the gate is driven by the extension and retraction of the pneumatic cylinder, to realize the adjustment of furnace pressure in the furnace. There are the following problems in the production process:

[0003] 1. The pressure signal output by the IP converter is greatly affected by air tightness, and the failure rate is high;

[0004] 2. The electric control system adjusts slowly, and the pressure in the furnace fluctuates greatly;

[0005] 3. Due to the high temperature of the working environment, the failure rate of IP converter is high.

[0006] In view of the above problems, it is urgent to improve the existing gate control system. SUMMARY

[0007] The utility model aims at providing a kind of annealing furnace pressure control device, simple structure, convenient to use, guarantee production.

[0008] To achieve the above object, the utility model realizes by the following technical scheme:

[0009] A kind of annealing furnace pressure control device, including gate valve, valve positioner, cylinder, locking device, the extension end of the rotary shaft of gate valve is fixedly connected with locking device, one end of feedback connecting rod is fixedly connected with valve positioner, the other end of feedback connecting rod is hinged with locking device, the tail of cylinder is fixedly connected with steel structure, the piston rod of cylinder is hinged with locking device, valve positioner is connected with electric control box.

[0010] Cylinder drives gate valve to rotate by locking device, locking device includes connecting block one, connecting block two, connecting block one, connecting block two are respectively provided with semicircular slot, connecting block one, connecting block two and the extension end of the rotary shaft of gate valve are buckled together, connecting block one and connecting block two are fixedly connected by bolt.

[0011] Air inlet is provided on valve positioner, and the air inlet of valve positioner is connected with compressed air.

[0012] One end of the feedback connecting rod is connected with the feedback rod in the valve positioner, and the valve positioner output gas source port is connected with the cylinder gas source port through a rubber pipe.

[0013] The cylinder is provided with a cylinder gas source port one and a cylinder gas source port two, the cylinder gas source port one is communicated with the bottom of the cylinder, and after air is supplied, the piston is pushed to drive the piston rod upward, the cylinder gas source port two is communicated with the top of the cylinder, and after air is supplied, the piston is driven to retreat to the initial position;

[0014] The valve positioner output gas source port includes a valve positioner output gas source port one and a valve positioner output gas source port two, the valve positioner output gas source port one is connected with the cylinder gas source port one through a metal hose, and the valve positioner output gas source port two is connected with the cylinder gas source port two through a metal hose.

[0015] The electric control box is provided with a PLC, and the valve positioner is connected with the PLC.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] 1. The annealing furnace pressure control device does not need an IP converter, changes the pressure signal into an electric signal, reduces the failure rate, and improves the production safety;

[0018] 2. The valve positioner is cooled by compressed air, the working temperature of the valve positioner is reduced, the service life is improved, and the failure rate is reduced;

[0019] 3. The valve positioner output gas source port one is connected with the cylinder gas source port one through a metal hose, compared with the rubber pipe connection, the metal hose connection has a long service life;

[0020] 4. The cylinder is connected with the gate plate through the locking device, the cylinder drives the gate plate to move conveniently, and the locking device adopts a split structure, so that the maintenance personnel can conveniently maintain and dismount the gate plate;

[0021] 5. The device is reasonable in design, simple in structure, convenient to use, low in cost, low in investment cost, and simple to maintain. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view of the annealing furnace pressure control device.

[0023] In the figure: 1-valve positioner 2-cylinder 3-gate plate 4-feedback connecting rod 5-adjusting signal output 6-compressed air 7-metal hose one 8-metal hose two 9-rotation shaft of the gate plate 10-bolt. DETAILED DESCRIPTION

[0024] The utility model is described in detail in combination with the drawings of the description, but it should be pointed out that the implementation of the utility model is not limited to the following embodiments.

[0025] The following examples are implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are all conventional methods unless otherwise specified.

[0026] Example 1

[0027] See Figure 1 An annealing furnace pressure control device, comprising a gate plate 3, a valve positioner 1, a cylinder 2, a locking device, the cylinder 2 drives the gate plate 3 to rotate through the locking device, the locking device comprises a connecting block one and a connecting block two, the connecting block one and the connecting block two are respectively provided with semicircular grooves, the connecting block one and the connecting block two are buckled together with the extended end of the rotating shaft 9 of the gate plate, and the connecting block one and the connecting block two are fixedly connected through a bolt 10; one end of a feedback connecting rod 4 is fixedly connected with a cam feedback rod in the valve positioner 1, the other end of the feedback connecting rod 4 is hingedly connected with the locking device, the feedback connecting rod 4 is used for feeding back a position signal to the valve positioner 1, the cylinder 2 is fixedly connected with a steel structure, and a piston rod of the cylinder 2 is hingedly connected with the locking device.

[0028] The valve positioner 1 adopts KOSO, and the model is EPA814-L10H, and other models can also be adopted; the valve positioner 1 is provided with an air inlet and a cooling air inlet, and the air inlet and the cooling air inlet of the valve positioner 1 are connected with compressed air 6; the cylinder 2 is provided with a cylinder 2 air inlet one and a cylinder 2 air inlet two, the cylinder 2 air inlet one is communicated with the bottom of the cylinder 2, air is passed to push the piston to drive the piston rod upwards, the cylinder 2 air inlet two is communicated with the top of the cylinder 2, and air is passed to make the piston drive the piston rod to retreat to the initial position; the valve positioner 1 output air inlets include a valve positioner 1 output air inlet one and a valve positioner 1 output air inlet two, the valve positioner 1 output air inlet one is used for driving the cylinder 2 to extend to make the gate plate 3 rotate clockwise to open, the valve positioner 1 output air inlet two is used for driving the cylinder 2 to retract to make the gate plate 3 rotate counterclockwise to close, the valve positioner 1 output air inlet one is connected with the cylinder 2 air inlet one through a metal hose one 7, and the valve positioner 1 output air inlet two is connected with the cylinder 2 air inlet two through a metal hose two 8. The cylinder 2 is driven by the valve positioner 1, and the valve positioner 1 is connected with a PLC in an electric control box.

[0029] Working process:

[0030] The PLC system transmits a control signal to the valve positioner through the measured value of the furnace pressure, the valve positioner drives the cylinder to act through the pressure proportion of the output air inlet one and the output air inlet two, the cylinder drives the gate plate to rotate through the locking device, the locking device moves to drive the feedback connecting rod to act to feed back the stroke to the valve positioner, so that the position of the gate plate can be accurately adjusted according to the control signal.

[0031] The utility model discantele furnace pressure control device need not IP converter, change pressure signal for electric signal, reduce failure rate, improve production safety, through compressed air to the valve positioner in cooling, reduce valve positioner operating temperature, improve the life, reduce failure rate, valve positioner output gas source mouth no.

Claims

1. A furnace pressure control device for an annealing furnace, characterized in that, It includes a gate valve, a valve positioner, a cylinder, and a locking device. The extended end of the rotating shaft of the gate valve is fixedly connected to the locking device. One end of the feedback linkage is fixedly connected to the valve positioner, and the other end of the feedback linkage is hinged to the locking device. The tail of the cylinder is fixedly connected to the steel structure, and the piston rod of the cylinder is hinged to the locking device. The valve positioner is connected to the electrical control box.

2. The annealing furnace pressure control device according to claim 1, characterized in that, The cylinder drives the gate valve to rotate through a locking device. The locking device includes a first connecting block and a second connecting block. The first connecting block and the second connecting block are respectively provided with semi-circular grooves. The first connecting block and the second connecting block are engaged with the extended end of the rotating shaft of the gate valve. The first connecting block and the second connecting block are fixedly connected by bolts.

3. The annealing furnace pressure control device according to claim 1, characterized in that, The valve positioner is equipped with an air inlet, which is connected to compressed air.

4. The annealing furnace pressure control device according to claim 1, characterized in that, One end of the feedback linkage is connected to the feedback rod inside the valve positioner, and the output air source port of the valve positioner is connected to the air source port of the cylinder through a rubber hose.

5. The annealing furnace pressure control device according to claim 1, characterized in that, The cylinder is provided with a cylinder air source port one and a cylinder air source port two. Cylinder air source port one is connected to the bottom of the cylinder. After air is supplied, it pushes the piston and drives the piston rod upward. Cylinder air source port two is connected to the top of the cylinder. After air is supplied, it causes the piston to drive the piston rod back to the initial position. The valve positioner output air source ports include valve positioner output air source port one and valve positioner output air source port two. Valve positioner output air source port one is connected to cylinder air source port one through a metal hose, and valve positioner output air source port two is connected to cylinder air source port two through a metal hose.

6. The annealing furnace pressure control device according to claim 1, characterized in that, The electrical control box contains a PLC, and the valve positioner is connected to the PLC.

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