Super-huge steel ladle sliding nozzle mechanism and method

Abstract

The invention discloses an oversize steel ladle sliding nozzle mechanism and method. The oversize steel ladle sliding nozzle mechanism comprises a mounting plate, a sliding frame, a door frame, an oil cylinder support, refractory materials, a hydraulic cylinder and a door closing oil cylinder, and the refractory materials comprise an upper sliding plate, an upper nozzle, a lower sliding plate and a lower nozzle. 16 springs, 14 transition pressing blocks and 2 transition rollers are additionally arranged on the door frame component, so that ultrahigh surface pressure is generated between the surfaces of an upper sliding plate in a cavity of the mounting plate component and a lower sliding plate in a cavity of the sliding frame component, and the problem of molten steel leakage caused by insufficient surface pressure of a steel ladle sliding nozzle mechanism on an oversize steel ladle is solved. The clamping grooves are additionally formed in the two ends of the sliding frame component, and the oil cylinder support component is freely switched on the mounting plate component and the door frame component in two connecting modes, so that forward mounting and reverse mounting of the mechanism are integrated, the problem that mounting is limited by site environment positions or mounting modes in a steel mill is solved, and the structure of the steel ladle sliding nozzle mechanism is more flexible and variable.

Description

Technical Field

[0001] The invention relates to molten steel flow control equipment between a ladle and a tundish in a continuous casting area of ​​a steelmaking plant, in particular to a sliding water nozzle mechanism and method for an extra-large ladle. Background Art

[0002] During steelmaking, existing steel mills need to use a ladle to put the molten steel into a tundish. The ladle nozzle sliding mechanism installed at the bottom of the ladle can control the flow of molten steel at any time. Since the ambient temperature of the lower part of the ladle is very high, usually up to 300-500℃, the main materials used in the mechanism are made of heat-resistant steel; and the temperature of molten steel is as high as about 1600℃-1800℃, all components in the mechanism that are in direct contact with the molten steel (upper nozzle, upper slide plate, lower slide plate, lower nozzle) are made of high-temperature refractory materials.

[0003] At present, the super-large ladles in steel plants have reached 350t, and the overall surface pressure and refractory aperture of the original ladle sliding nozzle cannot meet the requirements.

[0004] When the molten steel in the ladle is drained, the refractory material in the mechanism needs to be replaced. In order to reduce energy consumption, avoid baking the ladle again, save time and improve the turnover of the ladle, as long as the ladle as a whole can continue to be used, it is quickly replaced when the ladle is not cooled down.

[0005] Therefore, how to reduce the labor intensity of on-site operators, reduce replacement time and ensure safety becomes a very important issue. Summary of the invention

[0006] In order to solve the above technical problems, the inventors have obtained the technical solution of the present invention through practice and summary. The present invention adopts the following technical solution:

[0007] A super-large ladle sliding nozzle mechanism, comprising a mounting plate, a sliding frame, a door frame, a cylinder support, a refractory material, a hydraulic cylinder, and a door-closing cylinder, wherein the refractory material comprises an upper slide plate, an upper nozzle, a lower slide plate, and a lower nozzle;

[0008] The sliding frame is installed in the door frame, the oil cylinder support is fixed on the door frame, the door frame is connected to the mounting plate through a pin shaft and a surface pressure hook, the hydraulic cylinder is hung on the oil cylinder support, the head of the hydraulic cylinder is connected to the sliding frame slot, and the refractory material is installed in the mechanism cavity;

[0009] The mounting plate is provided with two groups of connecting blocks connected to the ladle reference plate, and each group is provided with two on the left and right. Each connecting block is provided with a notch and a hinge hole located on the side of the notch for inserting a pin shaft therein. The two pin shafts located on one side are used for rotating and connecting the door frame, and the two pin shafts on the other side are connected to two surface pressure hooks for closing the door, fixing and maintaining pressure. The mounting plate is provided with two opening grooves for hanging and closing the door cylinder, and the mounting plate is provided with a mounting cavity. A clamping assembly 1 is installed in the mounting cavity. The clamping assembly is used to install the upper slide plate, and a notch is provided in the mounting cavity for installing a positioning ring.

[0010] One side of the door frame is connected to the door frame support for connecting the mounting plate, and the other side is connected to two groups of hook pins and a door closing pressure block located between the two groups of hook pins for applying pressure to the door closing cylinder when closing the door. The door frame located on the same side of the hook pin is provided with an anti-drop pin assembly for preventing the surface pressure hook from being disengaged, and the side of the door frame opposite to the sliding frame is provided with a surface pressure spring assembly for ultra-high pressure surface pressure upper slide plate and lower slide plate;

[0011] The sliding frame is provided with a slide plate cavity, and a notch is provided in the slide plate cavity for installing a detachable top tightening sleeve, the top tightening sleeve is partially exposed on the outside of the sliding frame and is connected to a heat insulation board, and a top tightening device is provided on the top tightening sleeve for tightening the water outlet, and a clamping component 2 is installed in the slide plate cavity, and the clamping component 2 is used to install the lower slide plate, a card slot is provided at one end of the sliding frame, and a push-pull rod component is provided at the other end, and two slide bars are provided on both sides of the sliding frame for bearing the pressure of the surface pressure spring component and enabling relative sliding;

[0012] The oil cylinder support comprises an oil cylinder support body formed by welding, a protective plate having a protective function and a latch for connection and fixing.

[0013] Preferably, the slide cavity is provided with slots on both sides for positioning and clamping the water inlet installation tool when installing the water inlet;

[0014] A support block for supporting the upper nozzle installation tool is provided on the side of the installation plate;

[0015] A hexagon socket screw is installed on the mounting plate to hold one end of the fixed pin shaft to prevent rotation;

[0016] Two clamping blocks are respectively arranged on both sides of the door frame, which are used to prevent the sliding frame from falling due to its own weight when the door is opened by the pre-compression action of the surface pressure spring assembly.

[0017] Preferably, the mounting plate is internally slotted and perforated to connect two welded air-permeable plates on the surface, and the two air-permeable plates are used to cool the entire interior of the mechanism;

[0018] The surface pressure spring assembly includes countersunk hole 1 and countersunk hole 2 arranged on the door frame, wherein a coil spring 1, a transition pressure wheel and a locking nut 1 are installed in the countersunk hole, and a transition pressure block, a coil spring 2 and a locking nut 2 are installed in the countersunk hole 2. The transition pressure block and the transition pressure wheel are partially exposed on the outside of the door frame for surface pressure sliding frame; it also includes a cooling channel high arranged on the door frame to cool the spring.

[0019] Wherein, an air hole is arranged on the transition pressure block.

[0020] Preferably, the installation cavity and the positioning ring, the slide cavity and the tightening sleeve are all provided with five long notches, which are used to buffer the molten steel when accidental steel seepage occurs between the nozzle and the slide to avoid burning of the mechanism.

[0021] Preferably, the heat insulation board is provided with three positioning pointers for observing the moving position of the sliding frame.

[0022] Preferably, the clamping assembly 1 includes a heat-resistant magnetic steel 1 and a horseshoe iron 1 arranged in the installation cavity, the heat-resistant magnetic steel 1 is used to adsorb and fix the upper slide plate, the horseshoe iron 1 is used to move inwards, clamp and fix the upper slide plate, and a push piece 1 located on one side of the installation cavity is installed on the installation plate, and the push piece 1 is used to squeeze the horseshoe iron 1 into the installation cavity;

[0023] The second clamping component includes two heat-resistant magnetic steels and two horseshoe-shaped irons arranged in the slide cavity. The two heat-resistant magnetic steels are used to adsorb and fix the lower slide. The two horseshoe-shaped irons are used to move inward and clamp and fix the lower slide. The sliding frame is provided with two pushing pieces located on one side of the slide cavity. The two pushing pieces are used to squeeze the two horseshoe-shaped irons into the slide cavity.

[0024] Preferably, the pushing member 1 and the pushing member 2 both include a sinking groove, a fixing plate is installed at the notch of the sinking groove, a cam is installed on the fixing plate, the cam is located in the sinking groove and is used to push the horseshoe iron 1 or the horseshoe iron 2 to press and fix the upper slide plate or the lower slide plate;

[0025] Side grooves are provided in the middle of both sides of the horseshoe iron 1 or the horseshoe iron 2;

[0026] A guide rod is installed inside the installation cavity and the sliding cavity, and a conductor protruding outward is arranged on the side of the guide rod. The conductor and the side groove are corresponding in position and are installed in a sliding fit.

[0027] Preferably, the clamping assembly 1 and the clamping assembly 2 both include a side pressure block and a clamping member, a sliding pin 1 and a sliding pin 2 are mounted on the side pressure block, the sliding pin 1 and the side pressure block are connected via a torsion spring, and a half groove 1 for sliding pin 1 and a half groove 2 for sliding pin 2 are arranged on the mounting plate and the sliding plate in the thickness direction;

[0028] The side pressure block is provided with a pressure block and a limit block, the pressure block is located to receive the corresponding slide plate, and the limit block is used to limit the position of the slide plate;

[0029] The blocking piece is located on the mounting plate and the sliding plate outside the side pressure block. The blocking piece is an elastic telescopic structure. One end of the blocking piece close to the mounting plate and the sliding plate is a slope structure gradually approaching the sliding pin.

[0030] A method for using a super-large ladle sliding nozzle mechanism, comprising:

[0031] Step 1: Mechanism assembly

[0032] Install the water outlet and the tightening sleeve in the slide cavity of the sliding frame, and fix the water outlet through the tightening device, place the lower slide plate in the slide cavity, and fix the lower slide plate in the slide cavity by rotating the cam of the push piece after being adsorbed by the heat-resistant magnetic steel.

[0033] Install the water inlet and the positioning ring in the installation cavity, place the upper slide plate in the installation cavity, and fix the upper slide plate in the installation cavity by rotating the cam of the push piece 2 after being adsorbed by the heat-resistant magnetic steel 2;

[0034] The mounting plate and the door frame are connected through the pin shaft and the door frame support on one side to form an opening and closing door structure, and the surface pressure hook is installed on the other side of the mounting plate;

[0035] The sliding frame is installed in the sliding area between the pressing block of the door frame and the bottom surface of the door frame, and the surface pressure spring assembly acts on the slide bars on both sides of the sliding frame;

[0036] Hook the door closing pressure block through the T-shaped block at the end of the door closing cylinder piston rod and pull it to the side close to the mounting plate, hook the surface pressure hook on the hook pin on the side of the door frame, and limit the surface pressure hook with the anti-drop pin assembly to complete the assembly;

[0037] Step 2: Mechanism Installation

[0038] The mounting plate is fixedly mounted on the ladle reference plate;

[0039] Step 3, skateboard replacement

[0040] After the number of consecutive slidings on the friction surfaces of the upper and lower slide plates reaches the limit, remove the anti-drop pin assembly, and then hook the closing pressure block through the T-shaped block at the end of the piston rod of the closing cylinder and pull it toward the side close to the mounting plate to separate the surface pressure hook and the hook pin, and open the inner cavity of the mechanism;

[0041] The manipulator rotates the cam of the push piece in the opposite direction to loosen the upper and lower slide plates, and removes them through the manipulator;

[0042] The manipulator is provided by installing the upper slide plate in the slide plate cavity and the lower slide plate in the installation cavity, and the original non-friction surfaces of the upper slide plate and the lower slide plate are used as friction surfaces;

[0043] Rotate the door frame toward the mounting plate, hook the door closing pressure block through the T-shaped block at the end of the door closing cylinder piston rod and pull it toward the side close to the mounting plate, re-hook the surface pressure hook and the hook pin, and limit the surface pressure hook with the anti-drop pin assembly.

[0044] A method for using a super-large ladle sliding nozzle mechanism, comprising:

[0045] Step 1: Mechanism assembly

[0046] The water outlet and the tightening sleeve are installed in the slide cavity of the sliding frame, and the water outlet is fixed by the tightening device. The lower slide is aligned with the slide cavity and the lower slide is installed in the slide cavity along the axial direction. During the axial installation process, the non-friction surface of the lower slide acts on the pressure block to deflect the side pressure block inward, and the limit block limits the position of the lower slide. When the second sliding pin enters the second half groove, the lower slide is aligned with the slide cavity. When the second sliding pin is fully entered, the blocking piece limits the side pressure block in the thickness direction of the slide frame from the outside of the side pressure block. At this time, the lower slide is fixed in the slide cavity.

[0047] Install the upper water inlet and the positioning ring in the installation cavity, align the upper slide plate with the installation cavity and install the lower slide plate in the installation cavity along the axial direction. During the axial installation process, the non-friction surface of the upper slide plate acts on the pressure block to deflect the side pressure block inward, and the limit block limits the position of the upper slide plate. When the second sliding pin enters the second half groove, the upper slide plate is aligned with the installation cavity. When the second sliding pin is fully entered, the blocking piece limits the side pressure block in the thickness direction of the installation plate from the outside of the side pressure block. At this time, the upper slide plate is fixed in the installation cavity;

[0048] The mounting plate and the door frame are connected through the pin shaft and the door frame support on one side to form an opening and closing door structure, and a surface pressure hook is installed on the other side of the mounting plate;

[0049] The sliding frame is installed in the sliding area between the pressing block of the door frame and the bottom surface of the door frame, and the surface pressure spring assembly acts on the slide bars on both sides of the sliding frame;

[0050] Hook the door closing pressure block through the T-shaped block at the end of the door closing cylinder piston rod and pull it to the side close to the mounting plate, hook the surface pressure hook on the hook pin on the side of the door frame, and limit the surface pressure hook with the anti-drop pin assembly to complete the assembly;

[0051] Step 2: Mechanism Installation

[0052] The mounting plate is fixedly mounted on the ladle reference plate;

[0053] Step 3, skateboard replacement

[0054] After the number of consecutive slidings on the friction surfaces of the upper and lower slide plates reaches the limit, remove the anti-drop pin assembly, and then hook the closing pressure block through the T-shaped block at the end of the piston rod of the closing cylinder and pull it toward the side close to the mounting plate to separate the surface pressure hook and the hook pin, and open the inner cavity of the mechanism;

[0055] The manipulator clamps the upper slide plate and the lower slide plate through the clamping claws. When the clamping claws enter the slide plate cavity and the installation cavity, they first move the blocking piece outward to contact the restriction of the opposite side pressure block, and then remove the upper slide plate and the lower slide plate.

[0056] The manipulator is provided by installing the upper slide plate in the slide plate cavity and the lower slide plate in the installation cavity, and the original non-friction surfaces of the upper slide plate and the lower slide plate are used as friction surfaces;

[0057] Rotate the door frame toward the mounting plate, hook the door closing pressure block through the T-shaped block at the end of the door closing cylinder piston rod and pull it toward the side close to the mounting plate, re-hook the surface pressure hook and the hook pin, and limit the surface pressure hook with the anti-drop pin assembly.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] 1. By adding 16 springs, 14 transition pressure blocks and 2 transition rollers to the door frame component, an ultra-high surface pressure is generated between the upper slide plate in the cavity of the mounting plate component and the lower slide plate in the cavity of the sliding frame component, solving the problem of molten steel leakage caused by insufficient surface pressure of the ladle sliding gate mechanism on extra-large ladles.

[0060] 2. By adding slots at both ends of the sliding frame components and freely switching between the two connection methods of the cylinder support components on the mounting plate components and the door frame components, the integration of the mechanism with upright and inverted installation is realized, which solves the problem that the steel plant is restricted in installation due to the on-site environment, location or installation method, and makes the structure of the ladle sliding water gate mechanism more flexible and changeable.

[0061] 3. A heat-resistant magnetic steel, a horseshoe iron and a cam device are respectively provided in the slide cavity of the mounting plate component and the sliding frame component. The slide is first adsorbed by the heat-resistant magnetic steel, and then the cam device is rotated to push the horseshoe iron to clamp and fix the slide. The operation is simple, the slide is firm and reliable, and is not easy to loosen or fall off.

[0062] 4. The upper and lower slides adopt an asymmetric structure. When the number of consecutive sliding on the friction surface of the upper and lower slides reaches the limit, the door frame components of the mechanism are opened to swap the upper and lower slides, and the non-friction surface becomes the friction surface again. The service life of the upper and lower slides is doubled, which greatly improves the life of the refractory material and reduces the cost.

[0063] 5. The closing cylinder acts on the closing pressure block of the door frame component and the side notch of the mounting plate component to apply pressure, and the surface pressure hook is hung and disengaged to achieve the closing and opening of the mechanism. The operation is convenient, safe and reliable.

[0064] 6. By replacing the two surface pressure hooks on the mounting plate component and the two door frame supports on the door frame component, the door opening direction of the mechanism can be changed, increasing the flexibility of the mechanism and adapting to the on-site environment.

[0065] 7. The two spring transition pressure blocks on the door frame components are changed into spring transition pressure wheels, which change sliding into rolling, reduce friction, and avoid the situation where the sliding frame components cannot be pulled under high pressure.

[0066] 8. The spring is compressed to provide pressure by tightening the door frame body and the spring locking nut. The surface pressure of the mechanism can be adjusted through the spring locking nut, and the pressure can be adjusted according to the situation of the steel plant.

[0067] 9. A support block for supporting the upper water inlet installation tool is provided on the side of the installation plate component, which can save the original manual support of the upper water inlet installation tool to install the upper water inlet. The support block can be freely replaced in four positions and is suitable for two door opening directions and two installation directions of the mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0069] Figure 2 It is a top view of the overall structure of the present invention;

[0070] Figure 3 for Figure 2 Sectional view at the middle BB;

[0071] Figure 4 It is a schematic diagram of the overall structure of the mounting plate of the present invention;

[0072] Figure 5 A top view of the mounting plate of the present invention;

[0073] Figure 6 for Figure 5 Cross-section at AA in the middle;

[0074] Figure 7 It is a schematic diagram of the overall structure of the door frame of the present invention;

[0075] Figure 8 It is a schematic diagram of the overall structure of the sliding frame of the present invention;

[0076] Fig. 9 It is a schematic diagram of the overall structure of the oil cylinder support of the present invention;

[0077] Fig.10 A cross-sectional view of a mounting plate of a clamping method of the present invention;

[0078] Fig.11 for Fig.10 A partial enlarged view of point D in the middle;

[0079] Fig.12 for Fig.11 The location distribution diagram of the middle half slot;

[0080] Fig.13 A cross-sectional view of a sliding frame of a clamping method of the present invention;

[0081] Fig.14 for Fig.10 An expanded schematic diagram of a clamping assembly;

[0082] Fig.15 It is a cross-sectional view of the refractory material of the present invention. DETAILED DESCRIPTION

[0083] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0084] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0085] Example 1

[0086] like Figures 1 to 9 As shown, a super large ladle sliding nozzle mechanism includes a mounting plate 1, a sliding frame 2, a door frame 3, a cylinder support 4, a refractory material 5, a hydraulic cylinder, and a door closing cylinder. The refractory material 5 includes an upper slide plate 51, an upper nozzle 52, a lower slide plate 53, and a lower nozzle 54.

[0087] The sliding frame 2 is installed in the door frame 3, the cylinder support 4 is fixed on the door frame 3, the door frame 3 is connected to the mounting plate 1 through a pin shaft and a surface pressure hook 10, the hydraulic cylinder is hung on the cylinder support 4, the hydraulic cylinder head is connected to the card slot 25 of the sliding frame 2, and the refractory material 5 is installed in the mechanism cavity;

[0088] The mounting plate 1 is provided with two groups of connection blocks 11 connected to the ladle reference plate, and each group is provided with two on the left and right. Each connection block 11 is provided with a notch and a hinge hole located on the side of the notch for inserting a pin shaft. The two pin shafts located on one side are used to rotate and connect the door frame 3, and the two pin shafts on the other side are connected to two surface pressure hooks 10 for closing the door and fixing and maintaining pressure. The mounting plate 1 is provided with two opening grooves for hanging the door-closing cylinder, which can be respectively applied to the two closing directions of the mechanism. The mounting plate 1 is provided with a mounting cavity 12, and a clamping component 1 is installed in the mounting cavity 12. The clamping component is used to install the upper slide plate 51. The mounting cavity 12 is provided with a notch for installing a positioning ring 13, which is used for positioning when the mechanism and the ladle reference plate are installed and for partial replacement of parts when they are damaged by heat deformation. The closing cylinder acts on the closing pressure block of the door frame component and the side notch of the mounting plate component to apply pressure, and the surface pressure hook is hung and disengaged, so that the mechanism can close and open the door, which is convenient to operate, safe and reliable. At the same time, the door opening direction of the mechanism can be changed by interchanging the positions of the door frame support and the surface pressure hook.

[0089] One side of the door frame 3 is connected to the door frame support 32 for connecting the mounting plate 1, and the other side is connected to two groups of hook pins 31 and a door closing pressure block located between the two groups of hook pins 31 for applying pressure to the door closing cylinder when closing the door. The door frame 3 located on the same side of the hook pin 31 is provided with an anti-drop pin assembly 33 for preventing the surface pressure hook 10 from being disengaged, and the side of the door frame 3 opposite to the sliding frame 2 is provided with a surface pressure spring assembly for ultra-high pressure surface pressure on the upper slide plate 51 and the lower slide plate 53;

[0090] A slide plate cavity 21 is provided on the sliding frame 2, and a groove is provided in the slide plate cavity 21 for installing a detachable tightening sleeve 22. The tightening sleeve 22 is partially exposed on the outside of the sliding frame 2 and is connected to a heat insulation board 23. The tightening sleeve 22 is equipped with a tightening device 24 for tightening the lower water outlet 54. A clamping component 2 is installed in the slide plate cavity 21, and the clamping component 2 is used to install the lower slide plate 53. A slot 25 is provided at one end of the sliding frame 2, and a push-pull rod assembly 26 is provided at the other end. Two slide bars 27 are provided on both sides of the sliding frame 2 for bearing the pressure of the surface pressure spring assembly and enabling relative sliding. By adding slots at both ends of the sliding frame and freely switching between the two connection methods of the cylinder support on the mounting plate and the door frame components, the integration of the mechanism of upright installation and inverted installation is realized, which solves the problem that the steel plant is restricted from installation due to the on-site environment location or installation method, and makes the structure of the ladle sliding water outlet mechanism more flexible and changeable.

[0091] The oil cylinder support 4 comprises an oil cylinder support body 41 formed by welding, a protective plate 42 for protection and a latch 43 for connection and fixing.

[0092] Example 2

[0093] In the said institutions, Figure 4As shown, the installation cavity 12 is provided with a clamping groove 25 on both sides for positioning and clamping the water inlet installation tool when installing the water inlet 52;

[0094] A support block 14 for supporting the water inlet installation tool is provided on the side of the installation plate 1, which can save the original manual support of the water inlet installation tool to install the water inlet. The support block 14 can be freely replaced in four positions and is suitable for two door opening directions and two installation directions of the mechanism.

[0095] A hexagon socket screw is installed on the mounting plate 1 to support one end of the fixed pin to prevent rotation;

[0096] like Figure 7 As shown, two pressing blocks 34 are respectively provided on both sides of the door frame 3, which are used to prevent the sliding frame 2 from falling due to its own weight when the door is opened by the pre-compression action of the surface pressure spring assembly.

[0097] Example 3

[0098] In the said institutions, Figure 4 and Figure 5 As shown, the mounting plate 1 is internally slotted and perforated to connect two welded air vent plates 15 on the surface, and the two air vent plates 15 are used to cool the surface pressure spring assembly; they are used to cool the high temperature radiation at the heated part of the mechanism and improve the service life of the mechanism.

[0099] like Figure 3 , 7 As shown, the surface pressure spring assembly includes a countersunk hole 1 and a countersunk hole 2 arranged on the door frame 3, a coil spring 1 35, a transition pressure wheel 36 and a locking nut 1 37 are installed in the countersunk hole, a transition pressure block 38, a coil spring 2 39 and a locking nut 2 310 are installed in the countersunk hole 2, and the transition pressure block 38 and the transition pressure wheel 36 are partially exposed on the outside of the door frame 3 for surface pressure on the sliding frame 2; wherein, an air hole is provided on the transition pressure block 38.

[0100] Example 4

[0101] In the said institutions, Figure 4 and Figure 8 As shown, the installation cavity 12 and the positioning ring 13, the slide cavity 21 and the top tightening sleeve 22 are all provided with five long notches, which are used to buffer the molten steel when accidental steel seepage occurs between the nozzle and the slide to avoid burning of the mechanism.

[0102] like Figure 1 As shown, the heat insulation board 23 is provided with three positioning pointers for observing the moving position of the sliding frame 2 .

[0103] Example 5

[0104] In the said institutions, Figure 4 , 5, 6, and 8, the clamping assembly 1 includes a heat-resistant magnetic steel 121 and a horseshoe iron 122 arranged in the installation cavity 12, the heat-resistant magnetic steel 121 is used to adsorb and fix the upper slide plate 51, the horseshoe iron 122 is used to move inward and clamp and fix the upper slide plate 51, and a push piece 123 located on one side of the installation cavity 12 is installed on the installation plate 1, and the push piece 123 is used to squeeze the horseshoe iron 122 into the installation cavity 12;

[0105] The second clamping component includes a second heat-resistant magnetic steel 211 and a second horseshoe iron 212 arranged in the slide cavity 21. The second heat-resistant magnetic steel 211 is used to adsorb and fix the lower slide 53, and the second horseshoe iron 212 is used to move inward and clamp and fix the lower slide 53. The sliding frame 2 is provided with a second push piece 213 located on one side of the slide cavity 21, and the second push piece 213 is used to squeeze the second horseshoe iron 212 into the slide cavity 21.

[0106] like Figure 6 As shown, the push member 123 and the push member 213 both include a sinking groove, a fixing plate is installed at the notch of the sinking groove, a cam is installed on the fixing plate, the cam is located in the sinking groove and is used to push the horseshoe iron 122 or the horseshoe iron 212 to press and fix the upper slide plate 51 or the lower slide plate 53;

[0107] Side grooves are provided in the middle of both sides of the horseshoe iron 122 or the horseshoe iron 212;

[0108] A guide rod 6 is installed inside the installation cavity 12 and the sliding cavity. A conductor protruding outward is arranged on the side of the guide rod 6. The conductor and the side groove are corresponding in position and are installed in a sliding fit.

[0109] Example 6

[0110] In the said institutions, Fig.10 , Fig.11 , Fig.12 As shown, the clamping assembly 1 and the clamping assembly 2 both include a side pressure block 7 and a clamping member 8, a sliding pin 1 71 and a sliding pin 2 72 are installed on the side pressure block 7, the sliding pin 1 71 and the side pressure block 7 are connected by a torsion spring, and a half groove 1 73 for sliding pin 1 71 and a half groove 2 74 for sliding pin 2 72 are provided on the mounting plate 1 and the sliding frame 2 along the thickness direction; a rectangular groove is provided on the side of the slide plate.

[0111] like Fig.11 As shown, a pressure block 75 and a limit block 76 are provided on the side pressure block 7. The pressure block 75 is located to receive the corresponding slide, and the limit block 76 is used to limit the position of the slide; the limit block 76 includes a baffle, a transverse plug-in shaft, and a spring body. The transverse plug-in shaft is transversely arranged near the top of the side pressure block 7, and the transverse plug-in shaft is connected to the inner side of the side pressure block 7 through the spring body. The baffle is used to limit the maximum stroke of the transverse plug-in shaft extending outward close to the side of the slide, and the transverse plug-in shaft corresponds to and is plugged into the rectangular groove.

[0112] As shown Fig.11 and Fig.12 As shown, the blocking member 8 is located on the mounting plate 1 and the sliding frame 2 outside the side pressure block 7. The blocking member 8 is an elastic telescopic structure, and one end of the blocking member 8 close to the mounting plate 1 and the sliding plate is a slope structure that gradually approaches the sliding pin 71. When the blocking member 8 is blocked by the side of the opposite side pressure block 7, the transverse insertion shaft will be inserted into the rectangular groove. When the blocking member 8 contacts the blocking of the opposite side, the transverse insertion shaft is reset and separated from the rectangular groove under the action of the spring body.

[0113] A method for using a super-large ladle sliding nozzle mechanism, comprising:

[0114] Step 1: Mechanism assembly

[0115] The water outlet 54 and the tightening sleeve 22 are installed in the slide cavity 21 of the sliding frame 2, and the water outlet 54 is fixed by the tightening device 24. The lower slide plate 53 is placed in the slide cavity 21, and after being adsorbed by the heat-resistant magnetic steel 121, the lower slide plate 53 is fixed in the slide cavity 21 by rotating the cam of the pushing member 123;

[0116] The water inlet 52 and the positioning ring 13 are installed in the installation cavity 12, and the upper slide plate 51 is placed in the installation cavity 12. After being adsorbed by the second heat-resistant magnetic steel 211, the upper slide plate 51 is fixed in the installation cavity 12 by rotating the cam of the second push member 213;

[0117] The mounting plate 1 and the door frame 3 are connected through the pin shaft and the door frame support 32 on one side to form an open and close door structure, and the surface pressure hook 10 is installed on the other side of the mounting plate 1;

[0118] The sliding frame 2 is installed in the sliding area between the pressing block 34 of the door frame 3 and the bottom surface of the door frame 3. At this time, the surface pressure spring assembly acts on the slide bars 27 on both sides of the sliding frame 2.

[0119] The T-shaped block at the end of the piston rod of the door closing cylinder is hooked to the door closing pressure block and pulled to the side close to the mounting plate 1, so that the surface pressure hook 10 is hooked on the hook pin 31 on the side of the door frame 3, and the anti-drop pin assembly 33 restricts the surface pressure hook 10 to complete the assembly;

[0120] Step 2: Mechanism Installation

[0121] The mounting plate 1 is fixedly mounted on the ladle reference plate;

[0122] Step 3, skateboard replacement

[0123] After the number of continuous sliding on the friction surface of the upper slide plate 51 and the lower slide plate 53 reaches the limit, the anti-drop pin assembly 33 is removed, and then the closing pressure block is hooked through the T-shaped block at the end of the piston rod of the closing cylinder and pulled toward the side close to the mounting plate 1 to separate the surface pressure hook 10 and the hook pin, and open the inner cavity of the mechanism;

[0124] The manipulator loosens the upper slide plate 51 and the lower slide plate 53 by rotating the cam of the push member in the opposite direction, and removes them through the manipulator;

[0125] The manipulator is configured by installing the upper slide plate 51 in the slide plate cavity 21 and the lower slide plate 53 in the mounting cavity 12, and the original non-friction surfaces of the upper slide plate 51 and the lower slide plate 53 are used as friction surfaces;

[0126] The door frame 3 is rotated toward the side of the mounting plate 1, and the closing pressure block is hooked again through the T-shaped block at the end of the closing cylinder piston rod and pulled toward the side close to the mounting plate 1, so that the surface pressure hook 10 and the hook pin are hooked again, and the anti-drop pin assembly 33 limits the surface pressure hook 10.

[0127] A method for using a super-large ladle sliding nozzle mechanism, comprising:

[0128] Step 1: Mechanism assembly

[0129] The water outlet 54 and the tightening sleeve 22 are installed in the slide cavity 21 of the sliding frame 2, and the water outlet 54 is fixed by the tightening device 24, and the lower slide 53 is aligned with the slide cavity 21 and installed in the slide cavity 21 along the axial direction. During the axial installation process, the non-friction surface of the lower slide 53 acts on the pressure block 75 to deflect the side pressure block 7 inward, and the limit block 76 limits the position of the lower slide 53. When the second sliding pin 72 enters the second half groove 74, the lower slide 53 is aligned with the slide cavity 21. When the second sliding pin 72 is completely entered, the clamping member 8 limits the side pressure block 7 from the outside of the side pressure block 7 in the thickness direction of the slide frame. At this time, the lower slide 53 is fixed in the slide cavity 21;

[0130] Install the upper water inlet 52 and the positioning ring 13 in the installation cavity 12, align the upper slide plate 51 with the installation cavity 12 and install the lower slide plate 53 in the installation cavity 12 along the axial direction. During the axial installation process, the non-friction surface of the upper slide plate 51 acts on the pressure block 75 to deflect the side pressure block 7 inward, and the limit block 76 limits the position of the upper slide plate 51. When the second sliding pin 72 enters the second half groove 74, the upper slide plate 51 completes the position alignment with the installation cavity 12. When the second sliding pin 72 is completely entered, the clamping member 8 limits the side pressure block 7 in the thickness direction of the installation plate 1 from the outside of the side pressure block 7. At this time, the upper slide plate 51 is fixed in the installation cavity 12;

[0131] The mounting plate 1 and the door frame 3 are connected through the pin shaft and the door frame support 32 on one side to form an open and close door structure, and the surface pressure hook 10 is installed on the other side of the mounting plate 1;

[0132] The sliding frame 2 is installed in the sliding area between the pressing block 34 of the door frame 3 and the bottom surface of the door frame 3. At this time, the surface pressure spring assembly acts on the slide bars 27 on both sides of the sliding frame 2.

[0133] The T-shaped block at the end of the piston rod of the door closing cylinder is hooked to the door closing pressure block and pulled to the side close to the mounting plate 1, so that the surface pressure hook 10 is hooked on the hook pin 31 on the side of the door frame 3, and the anti-drop pin assembly 33 restricts the surface pressure hook 10 to complete the assembly;

[0134] Step 2: Mechanism Installation

[0135] The mounting plate 1 is fixedly mounted on the ladle reference plate;

[0136] Step 3, skateboard replacement

[0137] After the number of continuous sliding on the friction surface of the upper slide plate 51 and the lower slide plate 53 reaches the limit, the anti-drop pin assembly 33 is removed, and then the closing pressure block is hooked through the T-shaped block at the end of the piston rod of the closing cylinder and pulled toward the side close to the mounting plate 1 to separate the surface pressure hook 10 and the hook pin, and open the inner cavity of the mechanism;

[0138] The manipulator clamps the upper slide plate 51 and the lower slide plate 53 through the clamping claws. When the clamping claws enter the slide plate cavity 21 and the installation cavity 12, the clamping claws first move the blocking member 8 outward to contact the restriction of the opposite side pressure block 7, and then remove the upper slide plate 51 and the lower slide plate 53.

[0139] The manipulator is configured by installing the upper slide plate 51 in the slide plate cavity 21 and the lower slide plate 53 in the mounting cavity 12, and the original non-friction surfaces of the upper slide plate 51 and the lower slide plate 53 are used as friction surfaces;

[0140] The door frame 3 is rotated toward the side of the mounting plate 1, and the closing pressure block is hooked again through the T-shaped block at the end of the closing cylinder piston rod and pulled toward the side close to the mounting plate 1, so that the surface pressure hook 10 and the hook pin are hooked again, and the anti-drop pin assembly 33 limits the surface pressure hook 10.

[0141] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. The replacement may be a replacement of a part of the structure, device, method step, or a complete technical solution. Any equivalent replacement or change according to the technical solution and the inventive concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A super-large ladle sliding nozzle mechanism, comprising a mounting plate (1), a sliding frame (2), a door frame (3), a cylinder support (4), a refractory material (5), a hydraulic cylinder, and a door closing cylinder, wherein the refractory material (5) comprises an upper slide plate (51), an upper nozzle (52), a lower slide plate (53), and a lower nozzle (54); in, The sliding frame (2) is installed in the door frame (3), the oil cylinder support (4) is fixed on the door frame (3), the door frame (3) is connected to the mounting plate (1) through a pin shaft and a surface pressure hook (10), the hydraulic cylinder is hung on the oil cylinder support (4), the head of the hydraulic cylinder is connected to the slot (25) of the sliding frame (2), and the refractory material (5) is installed in the mechanism cavity; Features: The mounting plate (1) is provided with two groups of connection blocks (11) connected to the ladle reference plate, with two blocks in each group, each of which is provided with a notch and a hinge hole located at the side of the notch for inserting a pin shaft therein, the two pin shafts located on one side are used for rotationally connecting the door frame (3), and the two pin shafts on the other side are connected to two surface pressure hooks (10) for closing the door and fixing it and maintaining pressure, the mounting plate (1) is provided with two opening grooves for hanging and closing the door cylinder, the mounting plate (1) is provided with a mounting cavity (12), a clamping assembly 1 is installed in the mounting cavity (12), the clamping assembly is used to install the upper slide plate (51), and a notch is provided in the mounting cavity (12) for installing a positioning ring (13); One side of the door frame (3) is connected to a door frame support (32) for connecting to a mounting plate (1), and the other side is connected to two groups of hook pins (31) and a door closing pressure block (311) located between the two groups of hook pins (31) for applying pressure when the door closing cylinder closes the door. An anti-drop pin assembly (33) for preventing the surface pressure hook (10) from being disengaged is provided on the door frame (3) located on the same side as the hook pin (31). A surface pressure spring assembly for ultra-high pressure surface pressure on an upper slide plate (51) and a lower slide plate (53); The sliding frame (2) is provided with a slide plate cavity (21), a notch is provided in the slide plate cavity (21) for installing a detachable top tightening sleeve (22), a portion of the top tightening sleeve (22) is exposed outside the sliding frame (2) and is connected to a heat insulation board (23), a top tightening device (24) is provided on the top tightening sleeve (22) for tightening the water outlet (54), a clamping assembly 2 is installed in the slide plate cavity (21), the clamping assembly 2 is used to install the lower slide plate (53), a card slot (25) is provided at one end of the sliding frame (2), and a push-pull rod assembly (26) is provided at the other end, and two slide bars (27) are provided on both sides of the sliding frame (2) for bearing the pressure of the surface pressure spring assembly and enabling relative sliding; The oil cylinder support (4) comprises an oil cylinder support body (41) formed by welding, a protective plate (42) having a protective function, and a latch (43) for connection and fixing.

2. The sliding gate mechanism of a super-large ladle according to claim 1, characterized in that: The slide cavity (21) is provided with clamping grooves (25) on both sides for positioning and clamping the water inlet installation tool when installing the water inlet (52); A support block (14) for supporting a water inlet installation tool is provided on the side of the installation plate (1); A hexagon socket screw is installed on the mounting plate (1) to support one end of the fixed pin to prevent rotation; Two pressing blocks (34) are respectively arranged on both sides of the door frame (3) and are used to prevent the sliding frame (2) from falling due to its own weight when the door is open, by being pre-compressed by the surface pressure spring assembly.

3. The sliding gate mechanism of a super-large ladle according to claim 1, characterized in that: The mounting plate (1) is internally slotted and perforated to connect two welded air-permeable plates (15) on the surface; The surface pressure spring assembly comprises a first countersunk hole and a second countersunk hole arranged on the door frame (3), wherein a coil spring (35), a transition pressure wheel (36) and a locking nut (37) are installed in the countersunk hole, and a transition pressure block (38), a second coil spring (39) and a second locking nut (310) are installed in the second countersunk hole, and the transition pressure block (38) and the transition pressure wheel (36) are partially exposed on the outside of the door frame (3) for surface pressure of the sliding frame (2); Wherein, the transition pressure block (38) is provided with an air hole.

4. The sliding gate mechanism of a super-large ladle according to claim 1, characterized in that: The installation cavity (12), the positioning ring (13), the slide cavity (21) and the top tightening sleeve (22) are all provided with five long notches, which are used to buffer the molten steel when accidental steel seepage occurs between the nozzle and the slide, so as to avoid burning of the mechanism.

5. The sliding gate mechanism of a super-large ladle according to claim 1, characterized in that: The heat insulation board (23) is provided with three positioning pointers for observing the moving position of the sliding frame (2).

6. The super-large ladle sliding nozzle mechanism according to any one of claims 1 to 5, characterized in that: The clamping assembly (1) comprises a heat-resistant magnetic steel (121) and a horseshoe iron (122) arranged in the installation cavity (12); the heat-resistant magnetic steel (121) is used to absorb and fix the upper slide plate (51); the horseshoe iron (122) is used to move inwards to clamp and fix the upper slide plate (51); a pushing piece (123) located at one side of the installation cavity (12) is installed on the installation plate (1); the pushing piece (123) is used to press the horseshoe iron (122) into the interior of the installation cavity (12); The clamping assembly 2 comprises a heat-resistant magnetic steel 2 (211) and a horseshoe-shaped iron 2 (212) arranged in the slide cavity (21); the heat-resistant magnetic steel 2 (211) is used for adsorbing and fixing the lower slide cavity (53); the horseshoe-shaped iron 2 (212) is used for moving inwards to clamp and fix the lower slide cavity (53); and a push piece 2 (213) located at one side of the slide cavity (21) is installed on the sliding frame (2); the push piece 2 (213) is used for squeezing the horseshoe-shaped iron 2 (212) into the slide cavity (21).

7. The sliding gate mechanism of a super-large ladle according to claim 6, characterized in that: The pushing member 1 (123) and the pushing member 2 (213) both include a sinking groove, a fixing plate is installed at the notch of the sinking groove, a cam is installed on the fixing plate, the cam is located in the sinking groove and is used to push the horseshoe iron 1 (122) or the horseshoe iron 2 (212) to press and fix the upper slide plate (51) or the lower slide plate (53); Side grooves are provided at the middle of both sides of the horseshoe-shaped iron (122) or the horseshoe-shaped iron (212); A guide rod (6) is installed inside the installation cavity (12) and the sliding cavity, and a conductor protruding outward is arranged on the side of the guide rod (6). The conductor and the side groove are corresponding in position and are installed in a sliding manner.

8. The sliding gate mechanism of a super-large ladle according to any one of claims 1 to 5, characterized in that: The clamping assembly 1 and the clamping assembly 2 both comprise a side pressure block (7) and a clamping member (8); a sliding pin 1 (71) and a sliding pin 2 (72) are mounted on the side pressure block (7); the sliding pin 1 (71) and the side pressure block (7) are connected via a torsion spring; a half groove 1 (73) for sliding pin 1 (71) and a half groove 2 (74) for sliding pin 2 (72) are arranged along the thickness direction on the mounting plate (1) and the sliding frame (2); A pressure block (75) and a limit block (76) are provided on the side pressure block (7), the pressure block (75) is located to receive the corresponding slide plate, and the limit block (76) is used to limit the position of the slide plate; The blocking member (8) is located on the mounting plate (1) and the sliding plate outside the side pressure block (7). The blocking member (8) is an elastic telescopic structure. One end of the blocking member (8) close to the mounting plate (1) and the sliding plate is a slope structure that gradually approaches the sliding pin 1 (71).

9. A method for using a sliding nozzle mechanism of an extra-large ladle, comprising the mechanism as claimed in any one of claims 1 to 7, characterized in that: include: Step 1: Mechanism assembly The water outlet (54) and the tightening sleeve (22) are installed in the slide cavity (21) of the sliding frame (2), and the water outlet (54) is fixed by the tightening device (24). The lower slide plate (53) is placed in the slide cavity (21), and after being adsorbed by the heat-resistant magnetic steel (121), the lower slide plate (53) is fixed in the slide cavity (21) by rotating the cam of the pushing member (123); The water inlet (52) and the positioning ring (13) are installed in the installation cavity (12), and the upper slide plate (51) is placed in the installation cavity (12). After being adsorbed by the second heat-resistant magnetic steel (211), the upper slide plate (51) is fixed in the installation cavity (12) by rotating the cam of the second push member (213); The mounting plate (1) and the door frame (3) are connected via a pin shaft and a door frame support (32) on one side to form an openable and closed door structure, and a surface pressure hook (10) is installed on the other side of the mounting plate (1); The sliding frame (2) is installed in the sliding area between the pressing block (34) of the door frame (3) and the bottom surface of the door frame (3), and the surface pressure spring assembly acts on the sliding strips (27) on both sides of the sliding frame (2); The door closing pressure block (311) is hooked by the T-shaped block at the end of the door closing oil cylinder piston rod and pulled toward the side close to the mounting plate (1), so that the surface pressure hook (10) is hooked on the hook pin (31) on the side of the door frame (3), and the anti-drop pin assembly (33) limits the surface pressure hook (10) to complete the assembly; Step 2: Mechanism Installation The mounting plate (1) is fixedly mounted on the ladle reference plate; Step 3, skateboard replacement After the friction surfaces of the upper slide plate (51) and the lower slide plate (53) slide continuously for a maximum number of times, the anti-drop pin assembly (33) is removed, and the closing pressure block (311) is hooked through the T-shaped block at the end of the piston rod of the closing oil cylinder and pulled toward the side close to the mounting plate (1), so that the surface pressure hook (10) and the hook pin are separated, and the inner cavity of the mechanism is opened; The manipulator rotates the cam of the push member in the opposite direction to loosen the upper slide plate (51) and the lower slide plate (53), and the manipulator removes them; The manipulator is provided by installing an upper slide plate (51) in a slide plate cavity (21) and a lower slide plate (53) in a mounting cavity (12), and using the original non-friction surfaces of the upper slide plate (51) and the lower slide plate (53) as friction surfaces; The door frame (3) is rotated toward one side of the mounting plate (1), and the door closing pressure block (311) is hooked again through the T-shaped block at the end of the door closing oil cylinder piston rod and pulled toward the side close to the mounting plate (1), so that the surface pressure hook (10) and the hook pin are hooked again, and the anti-drop pin assembly (33) limits the surface pressure hook (10).

10. A method for using a sliding gate mechanism of an extra-large ladle, comprising the mechanism as claimed in claim 8, characterized in that: include: Step 1: Mechanism assembly The water outlet (54) and the tightening sleeve (22) are installed in the slide cavity (21) of the sliding frame (2), and the water outlet (54) is fixed by the tightening device (24). The lower slide plate (53) is aligned with the slide cavity (21) and the lower slide plate (53) is installed in the slide cavity (21) along the axial direction. During the axial installation process, the non-friction surface of the lower slide plate (53) acts on the pressure block (75) to deflect the side pressure block (7) inwardly, and the limit block (76) limits the position of the lower slide plate (53). When the second sliding pin (72) enters the second half groove (74), the lower slide plate (53) is aligned with the slide cavity (21). When the second sliding pin (72) is completely inserted, the locking member (8) limits the side pressure block (7) in the thickness direction of the slide frame from the outside of the side pressure block (7). At this time, the lower slide plate (53) is fixed in the slide cavity (21); The upper water inlet (52) and the positioning ring (13) are installed in the installation cavity (12), the upper slide plate (51) is aligned with the installation cavity (12) and the lower slide plate (53) is installed in the installation cavity (12) along the axial direction. During the axial installation process, the non-friction surface of the upper slide plate (51) acts on the pressure block (75) to deflect the side pressure block (7) inwardly, and the limit block (76) limits the position of the upper slide plate (51). When the second sliding pin (72) enters the second half groove (74), the upper slide plate (51) is aligned with the installation cavity (12). When the second sliding pin (72) is completely inserted, the locking member (8) limits the side pressure block (7) in the thickness direction of the installation plate (1) from the outside of the side pressure block (7). At this time, the upper slide plate (51) is fixed in the installation cavity (12); The mounting plate (1) and the door frame (3) are connected via a pin shaft and a door frame support (32) on one side to form an openable and closed door structure, and a surface pressure hook (10) is installed on the other side of the mounting plate (1); The sliding frame (2) is installed in the sliding area between the pressing block (34) of the door frame (3) and the bottom surface of the door frame (3), and the surface pressure spring assembly acts on the sliding strips (27) on both sides of the sliding frame (2); The door closing pressure block (311) is hooked by the T-shaped block at the end of the door closing oil cylinder piston rod and pulled toward the side close to the mounting plate (1), so that the surface pressure hook (10) is hooked on the hook pin (31) on the side of the door frame (3), and the anti-drop pin assembly (33) limits the surface pressure hook (10) to complete the assembly; Step 2: Mechanism Installation The mounting plate (1) is fixedly mounted on the ladle reference plate; Step 3, skateboard replacement After the friction surfaces of the upper slide plate (51) and the lower slide plate (53) slide continuously for a maximum number of times, the anti-drop pin assembly (33) is removed, and the closing pressure block (311) is hooked through the T-shaped block at the end of the piston rod of the closing oil cylinder and pulled toward the side close to the mounting plate (1), so that the surface pressure hook (10) and the hook pin are separated, and the inner cavity of the mechanism is opened; The manipulator clamps the upper slide plate (51) and the lower slide plate (53) through the clamping claws. When the clamping claws enter the slide plate cavity (21) and the installation cavity (12), the clamping piece (8) is first moved outward to contact the restriction of the opposite side pressure block (7), and then the upper slide plate (51) and the lower slide plate (53) are removed. The manipulator is provided by installing an upper slide plate (51) in a slide plate cavity (21) and a lower slide plate (53) in a mounting cavity (12), and using the original non-friction surfaces of the upper slide plate (51) and the lower slide plate (53) as friction surfaces; The door frame (3) is rotated toward one side of the mounting plate (1), and the door closing pressure block (311) is hooked again through the T-shaped block at the end of the door closing oil cylinder piston rod and pulled toward the side close to the mounting plate (1), so that the surface pressure hook (10) and the hook pin are hooked again, and the anti-drop pin assembly (33) limits the surface pressure hook (10).

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