A self-locking structure for the pull-type heat preservation furnace cover hook

Abstract

The present invention belongs to the field of metallurgical machinery technology, and relates to a self-locking structure of a pull-type heat-insulating furnace cover hook, comprising a balancing hook, a stopper, a hook body rotating shaft and a hook body driving device, wherein the balancing hook has a hook head end cooperating with the stopper and a non-hooking end cooperating with the hook body driving device relative to the hook body rotating shaft, the stopper has a bottom and a side both in contact with the hook head end of the balancing hook, and the gravity moment of the non-hooking end of the balancing hook relative to the center of the hook body rotating shaft is greater than the gravity moment of the hook head end relative to the center of the hook body rotating shaft; the bottom of the stopper is set as a flat surface parallel to the horizontal plane, and the side is set as a cylindrical convex arc surface symmetrical about the horizontal center line of the stopper, and the center of the hook body rotating shaft coincides with the arc center of the cylindrical convex arc surface and falls on the horizontal center line of the stopper. The present invention can solve the problem that the furnace cover hook will cause a torque to be generated on the hook body rotating shaft under traction to make the balancing hook rotate in the disengagement direction.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical machinery, and in particular relates to a self-locking structure of a pull-type heat-insulating furnace cover hook. Background Art

[0002] Due to different process requirements, sometimes the ingot needs to be sent to the holding furnace for holding without cooling, and then sent to the heating furnace for heating and rolling. The holding equipment plays a buffering and coordinating role between the continuous casting machine and the heating furnace, so that the production process matching and logistics management have greater flexibility. In order to reduce the heat loss when opening the furnace cover when lifting the billet, the furnace cover of the slab warehouse holding furnace is generally designed in the form of multiple furnace covers (one active furnace cover and multiple driven furnace covers) pulling each other. It is not necessary to open all the furnace covers, but only open the furnace cover above the billet that needs to be lifted. This requires that different furnace covers can be flexibly connected or disconnected.

[0003] Existing, such as patent announcement number: CN212457912U, a furnace cover and its connecting device, the disclosed connecting structure between the furnace covers of the insulation furnace includes a balancing hook, a hook body rotating shaft, a block, a counterweight, a return spring, a buffer pad, a lever support, a lever, a retractable push rod device, and a pulley; wherein, the traction-type insulation furnace is equipped with an active furnace cover and a driven furnace cover on the furnace top, both of which are equipped with rollers, and can move along the track on the insulation furnace top driven by the active furnace cover; the active furnace cover is connected to the block, one end of the driven furnace cover is connected to the balancing hook and the other end is connected to the block, and the end of the driven furnace cover connected to the balancing hook is connected to the buffer pad, and the retractable push rod, lever, pulley, support system and the return spring constitute an antagonistic device that acts on the balancing hook to realize the disengagement or tightening action of the balancing hook and the block, so that the active furnace cover and the driven furnace cover can be disengaged or connected. However, since the traction force of the active furnace cover stopper on the driven furnace cover hook will generate a torque on the hook body shaft that causes the balance hook to rotate in the disengagement direction, the balance hook and the stopper often disengage during the furnace cover opening process, seriously threatening safe production.

[0004] However, in order to solve the above-mentioned unhooking problem, methods such as increasing the friction coefficient of the block contact surface to increase the friction force, adding an additional counterweight at one end of the balance hook, or / and using a high-performance return spring are often used to increase the resistance torque to balance the unhooking torque generated by the traction force. However, increasing the friction coefficient of the contact surface will be effective in the short term, but the friction coefficient will gradually decrease in long-term operation; while the methods of increasing the counterweight and using a high-performance return spring increase the cost of the counterweight and return spring. Therefore, neither method can fundamentally solve the unhooking problem during the furnace cover opening process. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a self-locking structure of a pull-type thermal insulation furnace cover hook, which aims to solve the problem that the hook between the furnace covers will cause a torque on the hook body shaft to rotate in the disengagement direction under the traction force.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A pull-type heat-insulating furnace cover hook self-locking structure comprises a balancing hook, a stopper, a hook body rotating shaft and a hook body driving device. The balancing hook has a hook head end cooperating with the stopper and a non-hooking end cooperating with the hook body driving device relative to the hook body rotating shaft. The stopper has a bottom and a side both in contact with the hook head end of the balancing hook. The gravity moment of the non-hooking end of the balancing hook relative to the center of the hook body rotating shaft is greater than the gravity moment of the hook head end relative to the center of the hook body rotating shaft. The bottom of the stopper is set as a flat surface parallel to the horizontal plane, and the side is set as a cylindrical convex arc surface symmetrical about the horizontal center line of the stopper, and the center of the hook body rotating shaft coincides with the center of the cylindrical convex arc surface and falls on the horizontal center line of the stopper.

[0008] Furthermore, the hook head end of the balancing hook has a columnar concave curved surface on the inner side corresponding to the side of the stopper, which is matched with the columnar convex curved surface.

[0009] Furthermore, a gap adjustment gasket for adjusting the contact gap between the inner side edge of the hook head end of the balancing hook and the side portion of the balancing hook hook stop block is provided on the driven furnace cover where the balancing hook is located.

[0010] Furthermore, the arc length of the cylindrical convex arc surface of the stopper is adjusted according to the swing angle and the pressure of the contact surface when the balance hook is disengaged.

[0011] Beneficial effects of the present invention: The present invention provides a pull-type insulation furnace cover hook self-locking structure, which achieves self-locking in the process of the driven furnace cover following the active furnace cover to open without increasing the friction coefficient of the block contact surface and without using counterweights and torsion springs by changing the geometric shapes of the balance hook and the block contact surface and changing the weight distribution structure of the balance hook itself, so as to fundamentally prevent the balance hook and the block from decoupling during the process of pulling the furnace cover open, effectively ensuring the safe and reliable operation of the insulation furnace while reducing the cost of using additional counterweights and high-performance return springs.

[0012] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings, in which:

[0014] Figure 1 It is a schematic diagram of the application of the hook self-locking structure of the present invention.

[0015] Figure 2 The figure is a schematic diagram of the geometric shape of a non-horizontal contact surface between the balance hook and the stopper in the hook self-locking structure of the present invention.

[0016] Figure 3 It is a schematic diagram of the main forces acting on the balance hook of the hook self-locking structure of the present invention when pulling the furnace cover.

[0017] Figure numerals: 1 is the active furnace cover, 2 is the driven furnace cover, 3 is the balance hook, 4 is the stopper, 5 is the gap adjustment gasket, 6 is the hook body shaft, 7 is the hook body driving device; 31 is the hook head end, 32 is the non-hooking end; 41 is the bottom, 42 is the side, and 43 is the horizontal center line of the stopper. DETAILED DESCRIPTION

[0018] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0019] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0020] Please refer to Figure 1As shown, the pull-type heat-insulating furnace cover hook self-locking structure mentioned in this embodiment is installed between the active furnace cover 1 and the adjacent driven furnace cover 2, and between the two adjacent driven furnace covers 2, and includes a balancing hook 3, a stopper 4, a hook body shaft 6 and a hook body driving device 7, wherein: the balancing hook 3 has a hook head end 31 cooperating with the stopper 4 and a non-hooking end 32 cooperating with the hook body driving device 7 relative to the hook body shaft 6, and the stopper 4 has a bottom 41 and a side 42 both in contact with the hook head end 31 of the balancing hook 3, the hook body driving device 7 is a mechanism that uses the principle of leverage to drive the balancing hook 3 to swing, and the hook body shaft 6 serves as a hinge point during the swinging process of the balancing hook 3. In this way, the traction-type insulation furnace is equipped with an active furnace cover 1 and multiple driven furnace covers 2 on the furnace top. The active furnace cover 1 has rollers and can move on the insulation furnace top along the track driven by a motor; the active furnace cover 1 is connected to a block 4; one end of the driven furnace cover 2 is connected to a balance hook 3 which can hook the block 4 on the adjacent furnace cover (active furnace cover 1 or driven furnace cover 2) or be disengaged from the block 4, and the other end is connected to a block 4 for the balance hook 3 on the adjacent furnace cover to hang or disengage, so that several (0, 1 or more) driven furnace covers 2 at specific positions can move together with the active furnace cover 1 to open the furnace cover at the specific position. The gravity moment of the non-hooking end 32 of the balancing hook 3 relative to the center of the hook body rotating shaft 6 is greater than the gravity moment of the hook head end 31 relative to the center of the hook body rotating shaft 6; the bottom 41 of the stopper 4 is set as a flat surface parallel to the horizontal plane, and the side 42 is set as a cylindrical convex arc surface symmetrical about the horizontal center line 43 of the stopper, and the center of the hook body rotating shaft 6 coincides with the center of the cylindrical convex arc surface and falls on the horizontal center line 43 of the stopper. That is, the flat surface of the bottom 41 of the stopper 4 can also be called a horizontal contact surface, and the cylindrical convex arc surface of the side 42 of the stopper 4 can also be called a non-horizontal contact surface. The shape of the non-horizontal contact surface is a section of cylindrical convex arc surface symmetrical to the horizontal plane of the horizontal center line 43 of the stopper passing through the center of the hook body rotating shaft 6, so that the cylindrical convex arc surface (or non-horizontal contact surface) will not generate a resultant torque on the hook body rotating shaft 6 during the process of transmitting traction force to pull the driven furnace cover 2, and the resultant force on the cylindrical convex arc surface (or non-horizontal contact surface) has no vertical component, so as to ensure that the balancing hook 3 and the stopper 4 can be disengaged and tightened without hindrance when the furnace cover is in a static state in the closed position.

[0021] By adopting the above scheme, by installing the block 4 with a special contact surface shape and the balancing hook 3 with a special weight configuration, when the active furnace cover 1 pulls the driven furnace cover 2, all the pressure directions generated on the non-horizontal cylindrical convex arc surface (or non-horizontal contact surface) pass through the center of the hook body rotating shaft 6 on the horizontal center line 43 of the block, so no additional clockwise moment is generated, and at the same time, the resultant force of the pressure on the cylindrical convex arc surface (or non-horizontal contact surface) provides the traction force of the driven furnace cover 2. The straight surface (or horizontal contact surface) of the bottom 41 of the block generates pressure acting on the hook body rotating shaft 6 to generate a clockwise resultant moment to balance the counterclockwise gravity moment generated by the unbalanced configuration of the balancing hook 3 itself, thereby realizing the self-locking of the balancing hook 3 and the block 4 during the pulling process. In simple terms, the hook body driving device 7 overcomes the gravity torque generated by the unbalanced gravity configuration of the balancing hook 3 itself and makes the balancing hook 3 rotate clockwise around the hook body rotating shaft 6, thereby realizing the disengagement action of the balancing hook 3 and the stopper 4; and when all furnace covers are in the closed state, the push rod of the hook body driving device 7 retracts into the cylinder, the gravity torque of the balancing hook 3 itself is greater than the driving torque, and the balancing hook 3 rotates counterclockwise around the hook body rotating shaft 6, thereby realizing the tightening action of the balancing hook 3 and the stopper 4.

[0022] In this embodiment, a buffer pad (not shown) is installed on one end of the driven furnace cover 2 connected to the balancing hook 3, and a gap adjustment gasket 5 is provided between the buffer pad and the driven furnace cover 2. During installation, the thickness of the gap adjustment gasket 5 can be increased or decreased to ensure that there is no gap between the vertical contact surfaces of the balancing hook 3 and the stopper 4 when they are in a tightened state.

[0023] The working principle of this embodiment is described below:

[0024] Reference Figure 2 , the center of the hook body rotating shaft 6 is point O, a circle O is made through point O, a horizontal line OC is made through point O, and points A and B are taken on the circle on the right side of the hook body rotating shaft 6, which are symmetrical about OC. The projection of a cylindrical convex arc surface on the balance hook 3 and the stopper 4, which is symmetrical about the horizontal plane of the stopper horizontal center line 43 passing through the center of the hook body rotating shaft 6, is arc ACB. The length of arc ACB can be adjusted according to the swing angle size and the pressure size of the non-horizontal contact surface when the balance hook 3 is disengaged. When the furnace cover is in the static state of the closed position, there is no pressure on the cylindrical convex arc surface, and the non-horizontal contact surface of the balance hook 3 and the stopper 4 is a circular arc with the same center and radius. During the rotation of the balance hook 3 around the hook body rotating shaft 6, it is obviously possible to ensure that the balance hook 3 and the stopper 4 can be disengaged and hung without obstacles.

[0025] Reference Figure 3, in the process of the active furnace cover 1 pulling the driven furnace cover 2, a force N1i can be generated at each point on the non-horizontal contact surface, and the distance from the center O of the hook body rotating shaft 6 to the action line of N1i is L1i, and the resultant force is N1=∑N1i. Each N1i direction passes through the center O of the hook body rotating shaft 6, so each L1i=0, and the resultant moment M1=∑L1i×N1i=0 generated on the non-horizontal contact surface at the center O of the hook body rotating shaft 6 to rotate the balance hook 3. Since the non-horizontal contact surface is symmetrical about the horizontal plane of the block horizontal center line 43 passing through the center of the hook body rotating shaft 6, the N1 direction is in the horizontal direction. G1 is the resultant weight of the non-hooking end 32 of the balance hook 3 located on the left side of the hook body rotating shaft 6, L3 is the distance between the center O of the hook body rotating shaft 6 and the action line force arm of G1, G2 is the resultant weight of the hook head end 31 of the balance hook 3 located on the right side of the hook body rotating shaft 6, and L4 is the distance between the center O of the hook body rotating shaft 6 and the action line force arm of G2. Due to the unbalanced weight configuration of the balancing hook 3, L3×G1 (counterclockwise)>L4×G2 (clockwise), so a pressure N2 is generated on the horizontal contact surface of the balancing hook 3 and the stopper 4, L2 is the distance between the center O of the hook body rotation axis 6 and the action line N2, and at the same time, L3×G1 (counterclockwise)=L4×G2 (clockwise)+L2×N2 (clockwise), thereby realizing self-locking of the balancing hook 3 and the stopper 4 during the pulling process.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A pull-type heat preservation furnace cover hook self-locking structure, comprising a balancing hook (3), a stopper (4), a hook body rotating shaft (6) and a hook body driving device (7), wherein the balancing hook has a hook head end (31) cooperating with the stopper and a non-hooking end (32) cooperating with the hook body driving device relative to the hook body rotating shaft, and the stopper has a bottom (41) and a side (42) both in contact with the hook head end of the balancing hook, characterized in that: The gravity moment of the non-hooking end of the balancing hook relative to the center of the hook body rotation axis is greater than the gravity moment of the hook head end relative to the center of the hook body rotation axis; the bottom of the stopper is set as a flat surface parallel to the horizontal plane, and the side is set as a cylindrical convex arc surface symmetrical about the horizontal center line (43) of the stopper, and the center of the hook body rotation axis coincides with the center of the cylindrical convex arc surface and falls on the horizontal center line of the stopper; the hook head end of the balancing hook has a cylindrical concave arc surface that is compatible with the cylindrical convex arc surface on the inner side corresponding to the side of the stopper.

2. The self-locking structure of the pull-type heat preservation furnace cover hook according to claim 1 is characterized in that: A gap adjustment gasket (5) is provided on the driven furnace cover where the balance hook is located, and is used to adjust the contact gap between the inner side edge of the hook head end of the balance hook and the side portion of the balance hook hook stopper.

3. The self-locking structure of the pull-type heat preservation furnace cover hook according to claim 1 is characterized in that: The arc length of the cylindrical convex arc surface of the stopper is adjusted according to the swing angle size and the contact surface pressure size when the balance hook is disengaged.

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