JP2009179660A - Automatic removal method of furnace lid for coke oven and furnace lid removing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cancel adhesion of coal tar intervening between an outer edge of a furnace lid and a peripheral edge of an aperture of a furnace hole to smoothly perform removal of the furnace lid when the furnace lid is removed after a carbonization step. <P>SOLUTION: Contraction operation of a horizontal movement cylinder 14a is performed for 2 sec to impart extraction force in a separated direction from the furnace hole 2a to the furnace lid 8. After the extraction force imparted to the furnace lid 8 is suspended for 1 sec, extension operation of the horizontal movement cylinder 14a is performed for 1 sec to impart pressing force in a direction toward the furnace hole 2a to the furnace lid 8. Second contraction operation of the horizontal movement cylinder 14a is then performed for 2 sec to impart extraction force in a direction separated from the furnace hole 2a to the furnace lid 8. After the extraction force imparted to the furnace lid 8 is suspended for 1 sec, removal control of the furnace lid 8 is performed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for automatically removing a furnace cover for a coke oven, and a furnace cover detachment apparatus equipped in a guide car or an extruder for a coke oven.

The coke oven is an apparatus for producing coke that is supplied as a reducing agent to a blast furnace by dry distillation of coal.
As shown in FIGS. 7 and 8, the coke oven 1 has the carbonization chambers 2 and the combustion chambers 3 alternately arranged in series, and the coal-coating vehicle 4 travels in the longitudinal direction on the roof of the coke oven 1, and the coke oven 1 The extruder 5 arranged on one side surface in the longitudinal direction of the coke oven 1 runs along the coke oven 1, and the guide wheel 6 and the fire extinguisher 7 arranged on the other side surface of the coke oven 1 along the coke oven 1. Run.

The charcoal vehicle 4 travels up to a predetermined carbonization chamber 2, charges coking coal from an inlet (not shown) provided at the upper portion of the carbonization chamber 2, and performs carbonization chamber 2 by a dry distillation process by indirect heating of the combustion chamber 3. The coking coal inside is carbonized.
When carbonized coke is generated in the carbonization chamber 2, the furnace lids mounted on both sides of the carbonization chamber 2 are removed, the furnace ports on both sides are opened, and the extruder 5 is placed near the furnace port on one side. The vehicle travels, and the guide car 6 and the fire extinguisher 7 run near the furnace port on the other side. Next, by moving an extrusion ram (not shown) of the extruder 5 from one furnace port to the other furnace port, the dry distillation coke in the carbonization chamber 2 is discharged from the other furnace port side, and is guided through the guide wheel 6. And put on the fire extinguisher 7. And the fire extinguisher 7 loaded with dry distillation coke travels to a fire extinguisher (not shown).

By the way, although not shown in figure, the extruder lid 5 and the guide wheel 6 are provided with the furnace cover removal | desorption apparatus which removes | removes the furnace cover of the coke oven 1 automatically (for example, patent document 1).
The furnace lid desorption apparatus of Patent Document 1 includes a lifter that moves a furnace lid up and down to engage or disengage a firewood provided in the furnace lid and a firewood receiving part provided in the furnace mouth, and the lifter as a furnace mouth. It has a horizontal moving part that moves close to or away from it, and these lifters and horizontal moving parts are driven by direct acting cylinders, and the furnace cover is automatically attached and detached by controlling each direct acting cylinder in sequence. It has become.
JP-A-5-255669

By the way, in the carbonization process of the coke oven 1, the tar component in the gas generated in the carbonization chamber 2 becomes coal tar, and this coal tar is between the opening edge of the furnace port and the outer edge of the furnace lid contacting the opening edge. The furnace lid is likely to adhere to the opening periphery of the furnace port.
For this reason, even if an attempt is made to automatically remove the furnace lid by operating the furnace lid desorption device after the carbonization process, the furnace lid attached to the periphery of the opening of the furnace opening cannot be removed immediately, and the furnace lid removal The operation of the equipment was repeated, and the operator had to rely on manual furnace lid removal work.

  Therefore, an object of the present invention is to eliminate the above-mentioned problems of the conventional technology, and when removing the furnace lid after the carbonization process, between the outer edge of the furnace lid and the opening periphery of the furnace mouth that are in contact with each other. The present invention is to propose a method for automatically removing a furnace lid for a coke oven and a furnace lid detaching apparatus that can smoothly remove the furnace lid by removing adhesion of coal tar intervening in the furnace.

  The invention according to claim 1 of the present invention is a method for automatically removing a furnace lid for a coke oven that automatically removes the furnace lid from the furnace port after the carbonization step, in a direction away from the furnace port with respect to the furnace lid. After automatically performing an adhesion release operation that repeatedly performs an operation of applying a pulling force and an operation of applying a pressing force to the furnace cover in a direction toward the furnace port, the furnace cover is removed from the furnace port. This is a method of automatically removing.

The invention according to claim 2 is the method for automatically removing a furnace cover for coke oven according to claim 1, wherein the furnace cover is applied with the pulling force and the pressing force for a predetermined time, or The pulling force and the pressing force are applied so that the distance from the furnace port changes by a predetermined stroke.
The invention according to claim 3 is the method for automatically removing a coke oven furnace lid according to claim 1 or 2, wherein the pulling force is applied to the furnace lid in a direction away from the furnace port. The application of external force to the furnace lid was stopped for a predetermined time.

  On the other hand, the invention described in claim 4 is a furnace lid desorption apparatus that is equipped in a guide wheel and an extruder of a coke oven and automatically desorbs a furnace lid that closes the furnace port of the coke oven. A horizontal moving part that can move in the direction toward or away from the first moving part, a first linear motion cylinder that horizontally moves the horizontal moving part by an expansion and contraction operation, and a horizontal moving part that are disposed on the horizontal moving part and support the furnace lid. A lifter that is movable in the vertical direction, a second linear cylinder that moves the lifter up and down by an expansion and contraction operation, and a hook engaging portion provided in the lifter so as to be engageable with a hook provided in the furnace lid And a control means for controlling the movement of the horizontal moving part and the lifter by controlling the expansion and contraction of the first and second linear cylinders, and immediately before removing the furnace cover from the furnace port after the dry distillation step, Separated from the furnace port That is a device provided direction relative to the operation and the furnace lid imparting pulling force and adhering releasing means repeatedly performs an operation of applying a pressing force in the direction toward the furnace opening.

  Further, the invention according to claim 5 is the furnace lid detaching apparatus according to claim 4, wherein the adhesion release means is engaged with the hook engaging portion with the hook of the furnace lid, and the control means is The first linear motion cylinder is a means for performing extension and retraction control repeatedly, and applying the pulling force and the pressing force to the furnace lid through the horizontal moving part and the lifter.

  According to the method for automatically removing a coke oven lid of the present invention, the tar component in the gas generated in the coke oven after the carbonization step becomes coal tar, and is interposed between the opening periphery of the furnace port and the outer edge of the furnace lid. Even if the furnace lid adheres to the furnace port, after the dry distillation process, the operation to apply a pulling force to the furnace lid in the direction away from the furnace opening, and to push the furnace lid toward the furnace opening By automatically performing the adhesion release operation that repeatedly performs the operation of applying force, the adhesion between the opening edge of the furnace port and the outer edge of the furnace lid is reliably released, and the automatic removal of the furnace lid is performed smoothly. be able to.

  Further, according to the furnace lid desorption apparatus according to the present invention, immediately before removing the furnace lid from the furnace port after the dry distillation step, the operation for applying a pulling force in the direction away from the furnace port to the furnace lid and the furnace lid Adhesion release means that repeats the operation of applying a pressing force in the direction toward the furnace opening is provided, so that adhesion of coal tar between the opening edge of the furnace opening and the outer edge of the furnace cover is reliably released, and the automatic operation of the furnace cover It is possible to provide a furnace lid detaching apparatus that can smoothly perform detachment.

  A method and an apparatus for automatically removing a furnace cover for a coke oven according to the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same component as the structure shown in FIG.7 and FIG.8, and the description is abbreviate | omitted.

  FIG. 1 is a plan view showing an outline of the main part of a coke oven, FIG. 2 is a detailed view in which a furnace lid is attached to the furnace port of the carbonization chamber 2, and FIG. 3 shows the configuration of the furnace lid desorption apparatus. 4 is a flowchart showing the removal control of the furnace lid 8, FIG. 5 is a flowchart showing the adhesion release control in the removal control of the furnace lid 8, and FIG. It is a figure explaining the extraction force and pressing force which are provided.

As shown in FIG. 1, a furnace port 2a is opened on one side surface of the carbonization chamber 2, and a rod 9 provided on the furnace lid 8 engages with a rod receiving portion 10 provided on the periphery of the furnace port 2a. Thus, the furnace lid 8 is attached to the furnace port 2a.
As shown in FIGS. 2 and 3, the furnace lid 8 includes a substantially rectangular parallelepiped refractory brick 8 a and an external rectangular lid portion 8 b integrated with the refractory brick 8 a, and a furnace port 2 a opened in a rectangular shape. The refractory brick 8a enters, and the outer edge of the lid portion 8b is in contact with the opening periphery of the furnace port 2a.

A pair of plate-like ridges 9 extending in the longitudinal direction in the width direction of the lid portion 8b are provided at positions separated in the longitudinal direction of the lid portion 8b. In addition, a pair of rod receiving portions 10 projecting in parallel from the width direction of the furnace port 2a are provided at positions spaced apart in the vertical direction (longitudinal direction) of the opening periphery of the furnace port 2a. An engaging recess 11 is formed in the upper portion of 10.
Then, the end of the lid 9 of the lid portion 8b is hooked into the engagement recess 11 of the lid receiving portion 10 from above and the lid 9 and the flange receiving portion 10 are engaged, so that the furnace lid 8 is attached to the furnace port 2a. Is done.

Here, the opening dimension of the engaging recess 11 (the opening dimension in the direction in which the flange receiving part 10 protrudes) is set to a dimension larger than the plate width of the end part of the flange 9.
As shown in FIG. 1, a furnace lid desorption device 12 is mounted on the guide wheel 6. As shown in FIG. 3, the furnace lid detaching device 12 includes a horizontal moving unit 13 installed in the guide wheel 6 so as to be movable in a direction close to or away from the furnace port 2 a, and the horizontal moving unit 13. Horizontally moving cylinders 14a and 14b composed of hydraulic cylinders to be moved, a lifter 15 installed in the horizontal moving part 13 so as to be movable in the vertical direction, and vertically movable cylinders 16a and 16b composed of hydraulic cylinders for vertically moving the lifter 15 , A support arm 17 provided on the lifter 15, a cylinder drive unit 18 that drives the horizontal movement cylinders 14 a and 14 b and the vertical movement cylinders 16 a and 16 b, a hydraulic pressure supply source 19 that supplies hydraulic pressure to the cylinder drive unit 18, and a cylinder drive The control part 20 which sequence-controls the part 18 and the operation part 21 which outputs a command to the control part 20 are provided. The horizontal moving unit 13, the horizontal moving cylinders 14a and 14b, the lifter 15, the vertical moving cylinders 16a and 16b, the pair of support arms 17 and the cylinder driving unit 18 are mounted on the guide wheel 6, and a hydraulic pressure supply source 19, a control unit 20 and The operation unit 21 is installed at a remote position away from the guide wheel 6.

The support arms 17 protrude in pairs toward the furnace port 2 a while being spaced apart from each other in parallel at the upper and lower portions of the lifter 15, and on the upper side of these support arms 17 from the lower side of the flange 9 of the furnace lid 8. A hook recess 17a to be engaged is formed.
The control unit 20 outputs an instruction to attach the furnace lid 8 and an instruction to remove the furnace lid 8 to the operation unit 21. Here, when outputting the installation instruction | command of the furnace lid 8 to the operation part 21, the lifter 15 supports the furnace lid 8 in the state which the hook recessed part 17a of a pair of support arm 17 received the collar 9 from the lower side. It shall be.

  The control unit 20 to which the installation instruction of the furnace lid 8 is input from the operation unit 21 controls the minimum retraction of the vertical movement cylinder 16a and the maximum expansion of the vertical movement cylinder 16b with respect to the cylinder driving unit 18 (first mounting control). Next, extension control (second mounting control) of the horizontal movement cylinders 14a and 14b, and then extension control of the vertical movement cylinder 16a and retraction control (third mounting control) of the vertical movement cylinder 16b are performed.

That is, the first mounting control of the cylinder drive unit 18 retracts the vertical movement cylinder 16a to the minimum stroke, and simultaneously extends the vertical movement cylinder 16b to the maximum stroke. By this operation, the lifter 15 moves upward to the highest position and supports the furnace lid 8.
The second mounting control of the cylinder drive unit 18 extends the horizontally moving cylinders 14a and 14b to a predetermined stroke. By this operation, the horizontal moving portion 13 moves to the vicinity of the furnace port 2a, and the rod 9 engaged with the hook recess 17a of the support arm 17 protrudes from the opening peripheral edge of the furnace port 2a. It is located immediately above the ten engagement recesses 11.

  The third mounting control of the cylinder drive unit 18 extends the vertical movement cylinder 16a to a predetermined stroke and simultaneously retracts the vertical movement cylinder 16b to the predetermined stroke. By this operation, when the lifter 15 is lowered, the rod 9 of the furnace lid 8 supported by the lifter 15 is engaged with the engagement recess 11 of the rod receiving portion 10 instead of the hook recess 17a of the support arm 17. By combining, the furnace lid 8 is attached to the furnace port 2a.

Next, the control performed by the control unit 20 that has received an instruction to remove the furnace lid 8 from the operation unit 21 will be described with reference to the flowcharts of FIGS. 4 and 5 and FIG. 6.
As shown in FIG. 4, the control unit 20 first performs engagement control of the rod 9 and the support arm 17 in step S1, performs adhesion release control of the furnace lid 8 in step S2, and performs first removal control in step S3. In step S4, the second removal control is performed.

  In the engagement control of the rod 9 and the support arm 17 in step S1 of FIG. 4, the vertical movement cylinder 16a is extended to the maximum stroke, and at the same time, the vertical movement cylinder 16b is retracted to the minimum stroke. By this operation, the lifter 15 is moved downward to the lowest position. Next, the horizontal movement cylinders 14a and 14b are extended to a predetermined stroke. By this operation, the horizontal moving portion 13 moves to the vicinity of the furnace port 2 a, and the hook concave portion 17 a of the support arm 17 is positioned directly below the rod 9 engaged with the engaging concave portion 11 of the rod receiving portion 10. Let Next, the vertical movement cylinder 16a is retracted to a predetermined stroke, and at the same time, the vertical movement cylinder 16b is extended to a predetermined stroke. By this operation, the lifter 15 is moved upward to a predetermined height position until the hook recess 17a of the support arm 17 is engaged with the flange 9.

  Further, the adhesion release control of the furnace lid 8 in step S2 of FIG. 4 applies a pulling force in the direction away from the furnace port 2a to the furnace lid 8 for 2 seconds in step S10, as shown in FIG. In step S11, the pulling force applied to the furnace cover 8 is stopped for 1 second. In step S12, a pressing force is applied to the furnace cover 8 in the direction toward the furnace port 2a. A second pulling force is applied to the furnace lid 8, and the pulling force applied to the furnace cover 8 is stopped for 1 second in step S14.

  That is, when the horizontal movement cylinders 14a and 14b are retracted for 2 seconds (step S10) in the adhesion release control of the furnace lid 8, the horizontal movement unit 13, the lifter 15 and the support arm 17 are moved as shown in FIG. And is transmitted as a force indicated by a broken-line arrow to the trough 9, and a pulling force is applied to the furnace lid 8 in a direction away from the furnace port 2a. Next, after the drawing force applied to the furnace lid 8 is stopped for 1 second (step S11), when the horizontally moving cylinders 14a and 14b are extended for 1 second (step S12), as shown in FIG. The force indicated by the solid line arrow is transmitted to the rod 9 through the moving unit 13, the lifter 15, and the support arm 17, and a pressing force is applied to the furnace lid 8 in the direction toward the furnace port 2a. Next, when the second horizontal movement cylinders 14a and 14b are retracted for 2 seconds (step S13), a pulling force is applied to the furnace lid 8 in a direction away from the furnace port 2a. Next, after the drawing force applied to the furnace lid 8 is stopped for 1 second (step S14), the process proceeds to the removal control of the furnace lid 8 (step S3 in FIG. 4).

Here, the hydraulic pressures of the horizontal movement cylinders 14a and 14b are set to 60 to 65 kgf / cm ² , and the pulling force generated by the retraction operation of the horizontal movement cylinders 14a and 14b is 5.0 ton to 5.5 ton. The generated pressing force is 7.4 to 8.0 tons.
In the first removal control in step S3 of FIG. 4, the vertical movement cylinder 16a is retracted to the minimum stroke, and at the same time, the vertical movement cylinder 16b is extended to the maximum stroke. By this operation, the hook 9 of the furnace lid 8 that has been engaged with the hook recess 17a of the support arm 17 is engaged with the hook recess 17a of the support arm 17 while the lifter 15 is moving upward. .

  Furthermore, the second removal control in step S4 of FIG. 4 retracts the horizontal movement cylinders 14a and 14b to the minimum stroke. By this operation, the horizontal movement unit 13 is separated from the furnace port 2a, and the lifter 15 is separated from the furnace port 2a together with the horizontal movement unit 13.

Next, the operation | movement which removes the furnace cover 8 automatically after the carbonization process of the coke oven 1 is demonstrated.
When the operator commands removal of the furnace cover 8 of the operation unit 21, the guide wheel 6 travels to a predetermined carbonization chamber 2 that discharges the generated dry distillation coke. Then, the lifter 15 of the furnace lid detaching device 12 mounted on the guide wheel 6 moves in the horizontal direction and the vertical direction, and the hook recess 17 a of the support arm 17 engages with the flange 9 of the furnace lid 8.

Next, adhesion release control is automatically performed, and a pulling force is applied to the furnace lid 8 in a direction away from the furnace port 2a for 2 seconds. After the pulling force is stopped for 1 second, the furnace port 2a for 1 second is stopped. A pressing force is applied to the furnace cover 8 in the direction in which it is directed, a pulling force is applied to the furnace cover 8 for the second time in 2 seconds, and control of stopping the pulling force for 1 second is further performed.
Here, after the carbonization process of the coke oven 1, the tar component in the gas generated in the carbonization chamber 2 becomes coal tar, and the opening periphery of the furnace port 2 a and the outer edge 8 b 1 of the furnace lid 8 in contact with the opening periphery. The furnace lid 8 is attached to the furnace port 2a, and the above-described adhesion release control is performed to repeat the pulling force and the pressing force on the furnace lid 8 so that the peripheral edge of the opening of the furnace port 2a and the furnace lid 8, the adhesion force between the outer edge 8b1 and the outer edge 8b1 gradually decreases, and the adhesion between the peripheral edge of the opening and the outer edge 8b1 is released.

The furnace cover 8, which has been released from the periphery of the opening of the furnace port 2 a, is supported by a lifter 15 that moves upward, and the lifter 15 moves horizontally in a direction away from the furnace port 2 a, thereby automatically moving from the furnace port 2 a. Will be removed.
The first linear motion cylinder of the present invention corresponds to the horizontal movement cylinders 14a and 14b, the second linear motion cylinder of the present invention corresponds to the vertical movement cylinders 16a and 16b, and the hook engaging portion of the present invention is a support arm. The control means of the present invention corresponds to the cylinder drive unit 18, the control unit 20, and the operation unit 21.

According to this embodiment, before removing the furnace lid 8 from the furnace port 2a, the pulling force and pressing force on the furnace lid 8 are automatically repeated, so that the opening periphery of the furnace port 2a and the outer edge 8b1 of the furnace lid 8 are Since the adhesion of coal tar intervening therebetween is reliably released, the automatic removal of the furnace lid 8 can be performed smoothly.
In addition, after the pulling force is applied to the furnace lid 8 in the adhesion release control, the operation is stopped for a predetermined time (1 second), so that the generated dry distillation coke is restricted from moving in the carbonization chamber 2. It is possible to prevent the dry distillation coke from collapsing from the furnace port 2a immediately after the furnace lid 8 is removed.

Further, the adhesion release control of this embodiment is performed by moving the lifter 15 (horizontal moving unit 13) horizontally with the support arm 17 provided on the lifter 15 of the furnace lid detaching device 12 engaged with the flange 9 of the furnace lid 8. Since the horizontal movement cylinders 14a and 14b are repeatedly expanded and contracted, the adhesion release operation mechanism can be simplified.
In the present embodiment, an example in which the furnace lid detaching device 12 is mounted on the guide wheel 6 has been shown, but the furnace lid detaching device having the same configuration is also mounted on the extruder 5, and one side surface of the carbonization chamber 2 is mounted. The same effect can be obtained by automatically removing the furnace lid by the same operation with respect to the furnace lid attached to the furnace port opened at.

  In addition, in the adhesion release control of the furnace lid 8 in FIG. 5, the process proceeds to the next step depending on the time setting, but instead of the time setting, when the horizontal movement cylinders 14a and 14b change to a predetermined stroke, the next step is performed. You may make it transfer to this step.

It is the figure which showed the principal part of the outline of the coke oven which concerns on this invention by planar view. It is a perspective view which shows the state which attached the furnace cover to the furnace port of the carbonization chamber. It is a figure which shows the structure of the furnace cover removal | desorption apparatus which concerns on this invention. It is a flowchart which shows the removal control of the furnace cover which the control means of the furnace cover removal | desorption apparatus which concerns on this invention performs. It is a flowchart which shows the adhesion cancellation | release control performed by the removal control of a furnace lid. It is the figure explaining the extraction force and pressing force which are given to a furnace lid in adhesion release control. It is the figure which showed schematic structure of the coke oven by planar view. It is the figure which showed schematic structure of the coke oven by the side view.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Coke oven, 2 ... Carbonization chamber, 2a ... Furnace port, 3 ... Combustion chamber, 4 ... Charcoal car, 5 ... Extruder, 6 ... Guide car, 7 ... Fire extinguisher, 8 ... Furnace lid, 8a ... Fire brick 8b ... lid part, 8b1 ... outer edge, 9 ... eaves, 10 ... eaves receiving part, 11 ... engagement recess, 12 ... furnace lid desorption device, 13 ... horizontal movement part, 14a, 14b ... horizontal movement cylinder, 15 ... lifter, 16a, 16b ... Vertical movement cylinder, 17 ... Support arm, 17a ... Hook recess, 18 ... Cylinder driving part, 19 ... Hydraulic supply source, 20 ... Control part, 21 ... Operation part

Claims (5)

In the method of automatically removing the furnace lid for the coke oven, which automatically removes the furnace lid from the furnace port after the carbonization process,
Automatic debonding operation of repeatedly applying a pulling force to the furnace lid in a direction away from the furnace port and an operation of applying a pressing force to the furnace lid in a direction toward the furnace port A method for automatically removing a furnace cover for a coke oven, wherein the furnace cover is automatically removed from the furnace port after performing the operation.   The furnace cover is applied with the pulling force and the pressing force so that the pulling force and the pressing force are applied only for a predetermined time, or so that the distance from the furnace port is changed by a predetermined stroke. The method for automatically removing a furnace cover for a coke oven according to claim 1.   3. The application of external force to the furnace lid is stopped for a predetermined time after the pulling force is applied to the furnace lid in a direction away from the furnace port. 3. Method for automatic removal of furnace lids for coke ovens. A furnace lid desorption device that is installed in a coke oven guide wheel and an extruder and automatically desorbs a furnace lid that closes the furnace port of the coke oven,
A horizontal moving part movable in a direction close to or away from the furnace port; a first linear cylinder for horizontally moving the horizontal moving part by an expansion and contraction; and the horizontal moving part. A lifter that supports the lid and is movable in the vertical direction, a second linear cylinder that moves the lifter up and down by an expansion and contraction operation, and a lifter that is engageable with a rod provided on the furnace lid. A hook engaging portion; and a control means for performing movement control of the horizontal moving portion and the lifter by expansion and contraction control of the first and second linear motion cylinders;
Immediately before the furnace lid is removed from the furnace port after the carbonization step, an operation of applying a pulling force to the furnace lid in a direction away from the furnace port, and pressing the furnace lid in a direction toward the furnace port A furnace lid desorption device comprising: an adhesion release unit that repeatedly performs an operation of applying force.   The adhesion release means controls the control means to repeatedly extend and retract with respect to the first linear cylinder in a state in which the hook engaging portion is engaged with the hook of the furnace lid, and the horizontal moving portion The furnace lid detaching apparatus according to claim 4, wherein the pulling force and the pressing force are applied to the furnace lid through the lifter.

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