Annealing furnace and its feeding device, guide rail mechanism, feeding car

Abstract

The present invention provides an annealing furnace and its feeding device, guide rail mechanism, and feeding cart. The purpose is to solve the technical problem of the prior art that aluminum coils need to be transported back and forth multiple times during annealing. The technical solution adopted is: the guide rail mechanism includes: a screw extending in the front-to-back direction, a motor driving the screw to rotate, a screw nut installed on the screw, and limiting ribs arranged on the left and right sides of the screw; the limiting ribs extend in the front-to-back direction, and the space between the two limiting ribs constitutes a limiting channel; the screw nut is installed with a limiting member, and the limiting member has a limiting hole running through its left and right sides. In addition, the present invention also provides a feeding cart that cooperates with the aforementioned guide rail mechanism, a feeding device with the aforementioned guide rail mechanism, and an annealing furnace.

Description

Technical Field

[0001] The present invention relates to the technical field of metal annealing and metal handling, and in particular to an annealing furnace and a feeding device, a guide rail mechanism and a feeding vehicle thereof. Background Art

[0002] During the production of aluminum foil, aluminum coils need to be fed into an annealing furnace for annealing. Annealing furnaces typically use a feeder trolley constrained to a guide rail to feed and unload aluminum coils. Most existing annealing furnace feeder trolleys cannot be separated from the guide rails, making them inflexible. In actual production, electric forklifts or electric hoists are needed to move aluminum coils from the storage area to the feeder trolley, or vice versa. However, electric forklifts and electric hoists can only carry one aluminum coil at a time, requiring multiple round trips between the annealing furnace and the storage area to complete the transport of a batch of aluminum coils. This process is cumbersome and time-consuming. Summary of the Invention

[0003] The present invention aims to provide a guide rail mechanism and a corresponding feeder trolley that can be flexibly separated and combined. The feeder trolley can be pulled to the aluminum coil storage area to load the coils, thereby transporting a batch of aluminum coils at once. Based on the same inventive concept, another object of the present invention is to provide a feeding device and an annealing furnace that incorporate the aforementioned guide rail mechanism and feeder trolley.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A guide rail mechanism includes: a screw extending in the front-to-back direction, a motor driving the screw to rotate, a screw nut installed on the screw, and limiting ribs arranged on the left and right sides of the screw; the limiting ribs extend in the front-to-back direction, and the space between the two limiting ribs constitutes a limiting channel; the screw nut is installed with a limiting member, and the limiting member has a limiting hole running through its left and right sides.

[0006] Optionally, the two limiting edges are respectively connected to a guide edge at the left end, and the space between the two guide edges constitutes a guide channel; the distance between the two guide edges gradually decreases from left to right, so that the guide channel gradually converges from left to right.

[0007] A feeding trolley, used in conjunction with the above-mentioned guide rail mechanism, includes: a frame, two rows of rollers installed at the bottom of the frame; the spacing between the outer sides of the two rows of rollers is the same as the spacing between the inner sides of the two limiting edges; the bottom of the frame is provided with downwardly extending limiting parts on the left and right sides respectively, and the limiting parts have limiting holes passing through the left and right sides thereof; the limiting holes are at the same height as the limiting holes.

[0008] Optionally, multiple feeding carts are provided in the front and rear directions for coordinated use; the front end of the frame is provided with front connecting parts on the left, middle and right, respectively, and the rear end of the frame is provided with rear connecting parts on the left, middle and right, respectively; the front connecting parts and the rear connecting parts are provided with first pin holes passing through the upper and lower parts respectively; the front connecting part of the feeding cart corresponds to the rear connecting part of the adjacent feeding cart in front up and down, and are connected by a pin passing through the first pin hole; the middle part of the pin has a restricted ring part, and the diameter of the restricted ring part is larger than the aperture of the pin hole.

[0009] Optionally, a connecting member is further included; the connecting member has a plurality of second pin holes passing through the upper and lower surfaces for the passage of the pins; the connecting member also has fork holes passing through the front and rear surfaces for the passage of the forks of the electric forklift.

[0010] A feeding device comprises a connecting rod, the aforementioned guide rail mechanism and a feeding vehicle; the connecting rod passes through the limiting hole of the limiting member and the limiting hole of the limiting member to form a connection between the lead screw nut and the vehicle frame.

[0011] Optionally, the connecting rod includes a rod portion and a cap portion, and the rod portion is provided with a radial through hole for passing a steel wire at one end away from the cap portion; the diameter of the cap portion is larger than the aperture of the restricted hole; the aperture of the restricted hole is larger than or equal to the diameter of the rod portion, and smaller than the sum of the diameter of the rod portion and the diameter of the steel wire; when the connecting rod is connected to the screw nut and the frame; the part of the steel wire passing through the radial through hole is in a bent state to limit the connecting rod.

[0012] An annealing furnace comprises a furnace body and the aforementioned feeding device; the furnace body is provided with an opening for the feeding vehicle to enter and exit, and is adapted to the furnace door; the lead screw and the limiting edge pass through the opening; and the motor is located outside the furnace body.

[0013] Optionally, the furnace door includes a main body and a lifting part, one side of the main body is hinged to the furnace body by a hinge shaft extending up and down; the bottom end of the main body is higher than or flush with the top of the lead screw and the limiting edge; the main body is provided with two sliding grooves extending in the up and down directions on the outside, and the two sliding grooves constitute a limit for both sides of the lifting part; the bottom of the lifting part is provided with notches at positions corresponding to the lead screw and the limiting edge; the bottom of the main body is provided with a support part, and the support part corresponds to the notch of the lifting part.

[0014] Optionally, the lifting part is provided with a hanging ear for connecting a pull rope; the upper end of the pull rope is wrapped around a winch, and the winch is installed on the main body; the winch has an extension arm extending radially outward, and the outer end of the extension arm has a mounting hole for installing a handle; the handle can slide along the mounting hole, and both ends of the handle have limiting parts to prevent the handle from falling out of the mounting hole; the main body has a positioning hole for inserting the end of the handle.

[0015] The working principle of the present invention is as follows: the feeding trolley enters the limiting channel between the two limiting edges; the feeding trolley moves along the limiting channel so that the limiting hole of the limiting part is aligned with the limiting hole of the limiting part; the connecting rod passes through the limiting hole of the limiting part and the limiting hole of the limiting part, so that the screw nut is connected to the trolley frame, and the feeding trolley is matched with the guide rail mechanism; the motor drives the screw to rotate, so that the screw nut brings the feeding trolley into the annealing furnace. After annealing is completed, the motor drives the screw to rotate, so that the screw nut brings the feeding trolley out of the annealing furnace; the connecting rod is pulled out, so that the trolley frame and the screw nut are separated, so that the feeding trolley can leave the guide rail mechanism along the limiting channel.

[0016] As can be seen from the above, the beneficial effects of the present invention are: the guide rail mechanism and the feeder trolley can be flexibly separated and combined, and the feeder trolley can be pulled to the aluminum coil storage area to load the coils, thereby completing the transportation of a batch of aluminum coils at a time; there is no need to use an electric forklift or electric hoist to repeatedly travel back and forth between the annealing furnace and the storage area to complete the transportation of a batch of aluminum coils; operation is more convenient and time-saving. In addition, the position of the feeder trolley within the annealing furnace can be controlled by controlling the number of forward and reverse rotations of the motor; there is no need to install a drive unit on the feeder trolley; the motor can be installed outside the annealing furnace, thus avoiding the problem of the drive unit or motor having to cope with the high temperatures within the annealing furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 Schematic diagram of the structure of the guide rail mechanism;

[0019] Figure 2 It is a structural diagram of the limiting component;

[0020] Figure 3 A schematic diagram of the coordination between the feeding trolley, the latch and the connector;

[0021] Figure 4 This is a schematic diagram of multiple feeding vehicles cooperating to transport aluminum coils;

[0022] Figure 5 It is a structural diagram of the feeding device;

[0023] Figure 6 is a structural diagram of the connecting rod;

[0024] Figure 7 Schematic diagram of the structure of the annealing furnace;

[0025] Figure 8 Schematic diagram of setting up the guide rail mechanism for the annealing furnace;

[0026] Figure 9 This is a schematic diagram of the coordination between the main body and the lifting part of the furnace door;

[0027] Figure 10 A schematic diagram of a main body portion provided with a support portion;

[0028] Figure markings: 1. motor; 2. screw nut; 3. limiting rib; 4. limiting member; 5. limiting hole; 6. guide rib; 7. frame; 8. limiting member; 9. limiting hole; 10. front connecting part; 11. rear connecting part; 12. latch; 13. connecting member; 14. fork hole; 15. connecting rod; 16. radial through hole; 17. furnace body; 18. main body; 19. lifting part; 20. slide groove; 21. notch; 22. support part; 23. pull rope; 24. winch; 25. handle; 26. limiting part; 27. positioning hole; 28. second pin hole. DETAILED DESCRIPTION

[0029] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0030] In the description of the present invention, it should be understood that the terms "front", "back", "left", "right" and the like indicate directions or positional relationships based on the attached drawings. Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0032] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] like Figures 1 and 2 As shown, an embodiment of the present invention provides a guide rail mechanism. The guide rail mechanism includes: a lead screw extending in the front-to-back direction, a motor 1 that drives the lead screw, a lead screw nut 2 mounted on the lead screw, and limiting ribs 3 provided on the left and right sides of the lead screw; the limiting ribs 3 extend in the front-to-back direction, and the space between the two limiting ribs 3 forms a limiting channel; the lead screw nut 2 is mounted with a limiting member 4, which has a limiting hole 5 extending through its left and right sides. It should be understood that the ends of the limiting hole 5 can be configured as trumpet-shaped to facilitate insertion of the connecting rod 15.

[0035] Furthermore, the two limiting edges 3 are each connected to a guide edge 6 at their left ends, and the space between the two guide edges 6 constitutes a guide channel; the distance between the two guide edges 6 gradually decreases from left to right, so that the guide channel gradually converges from left to right. It should be understood that providing a gradually converging guide channel at the entrance end of the limiting channel is conducive to guiding the feeding cart to align in the direction of the limiting channel. When pushing or pulling the feeding cart into the limiting channel, there is no need to spend energy to precisely adjust the position of the feeding cart so that the two rows of rollers of the feeding cart are completely aligned with the limiting channel, which is more convenient and convenient.

[0036] like Figures 3 to 5 As shown, an embodiment of the present invention provides a feeder vehicle for use with the aforementioned guide rail mechanism. The feeder vehicle comprises: a frame 7; two rows of rollers mounted on the bottom of the frame 7; the spacing between the outer sides of the two rows of rollers is the same as the spacing between the inner sides of the two limiting edges 3; the bottom of the frame 7 is provided with downwardly extending limiting members 8 on the left and right sides, respectively, each of which has a limiting hole 9 extending through its left and right sides; the limiting hole 9 is at the same height as the limiting hole 5. It should be understood that the frame 7 can be provided with multiple layers of shelves for placing aluminum coils in the vertical direction; the limiting member 8 and the frame 7 can be arranged as an assembled structure or as an integrated structure.

[0037] Furthermore, multiple feeder carts are provided along the front-to-back direction for coordinated use. The front end of the frame 7 is provided with front connecting portions 10 on the left, center, and right sides, respectively, and the rear end of the frame 7 is provided with rear connecting portions 11 on the left, center, and right sides, respectively. Each of the front connecting portions 10 and rear connecting portions 11 is provided with a first pin hole extending vertically therethrough. The front connecting portion 10 of the feeder cart corresponds vertically to the rear connecting portion 11 of the adjacent feeder cart in front and is connected via a latch 12 extending through the first pin hole. The latch 12 has a limiting ring portion in the middle, the diameter of which is larger than the diameter of the pin hole. It should be understood that for multiple feeder carts connected front and back, only the frontmost feeder cart needs to be connected to the guide rail mechanism's screw nut 2. When the guide rail mechanism carries the frontmost feeder cart into the annealing furnace via the screw nut 2, the subsequent feeder carts are carried along the limiting channel into the annealing furnace. When the feeder cart is pulled from the front by an electric forklift, the latch 12 can be inserted only into the middle front connecting portion 10 and rear connecting portion 11. When pushed at the rear end by an electric forklift, a latch 12 can be inserted into the front connecting part 10 and the rear connecting part 11 at the left position or the middle position, or the front connecting part 10 and the rear connecting part 11 at the right position or the middle position, so as to prevent the feeder at the front end from tilting during the pushing process. In addition, when the space in the workshop in the length direction of the limit channel is limited and the feeder needs to turn to be aligned and enter the limit channel; if the feeder needs to turn right, the latch 12 can be left only at the front connecting part 10 and the rear connecting part 11 at the right position; if the feeder needs to turn left, the latch 12 can be left only at the front connecting part 10 and the rear connecting part 11 at the left position; to ensure that the front feeder can turn a sufficiently large angle relative to the rear feeder to complete the alignment. Setting the feeder into a structure that can be connected front and back is conducive to reducing the size of a single feeder, making the feeder more flexible, more widely used, and more compatible with upstream and downstream workstations.

[0038] Furthermore, the connector 13 includes a plurality of second pin holes 28 extending through its upper and lower surfaces for the insertion of the latch 12. The connector 13 also includes a fork hole 14 extending through its front and rear surfaces for the insertion of the fork of an electric forklift. It should be understood that the electric forklift can be connected to the feeder vehicle by passing the fork of the electric forklift through the fork hole 14 of the connector 13, causing the fork to ascend or descend with the connector 13, and causing the second pin holes 28 of the connector 13 to slide upward over the lower end of the latch 12 or downward over the upper end of the latch 12. In this way, for multiple feeder carts connected in a front-to-back manner, the forklift's fork can be connected to the front connection portion 10 of the frontmost feeder cart via the connector 13 and the latch 12, allowing the forklift to move the entire row of feeder carts, either on the left or right side of the feeder cart. When the forklift brings the front feeder cart into the limiting channel of the guide rail mechanism, the forklift is located outside the limiting edge 3. When the forklift separates from the feeder cart, it will not run over the limiting edge 3, thereby preventing deformation or damage to the limiting edge 3. It should be noted that when the forklift separates from the feeder cart, the connector 13 will be removed from the feeder cart.

[0039] like Figures 5 and 6 As shown, an embodiment of the present invention provides a feeding device, which includes a connecting rod 15, the aforementioned guide rail mechanism and a feeding cart; the connecting rod 15 passes through the limiting hole 9 of the limiting member 8 and the limiting hole 5 of the limiting member 4 to connect the screw nut 2 and the frame 7.

[0040] The specific implementation of the present invention is described below: the feeding trolley is made to enter the limiting channel between the two limiting edges 3; and the feeding trolley is made to move along the limiting channel so that the limiting hole 9 of the limiting member 8 is aligned with the limiting hole 5 of the limiting member 4; the connecting rod 15 is made to pass through the limiting hole 9 of the limiting member 8 and the limiting hole 5 of the limiting member 4, so that the screw nut 2 is connected to the frame 7, and the feeding trolley is matched with the guide rail mechanism; the motor 1 is made to drive the screw to rotate, so that the screw nut 2 brings the feeding trolley into the annealing furnace. After annealing is completed, the motor 1 is made to drive the screw to rotate, so that the screw nut 2 brings the feeding trolley out of the annealing furnace; the connecting rod 15 is pulled out, so that the frame 7 and the screw nut 2 are disengaged, so that the feeding trolley can leave the guide rail mechanism along the limiting channel. The guide rail mechanism and feeder trolley provided by the present invention can be flexibly separated and combined. The feeder trolley can be pulled to the aluminum coil storage area to load the coils, thereby completing the transportation of a batch of aluminum coils at a time. This eliminates the need for an electric forklift or electric hoist to repeatedly travel back and forth between the annealing furnace and the storage area to complete the transportation of a batch of aluminum coils, making operation more convenient and time-saving. Furthermore, the position of the feeder trolley within the annealing furnace can be controlled by controlling the number of forward and reverse rotations of the motor 1. This eliminates the need for a drive unit within the feeder trolley; the motor 1 can be located outside the annealing furnace, thus avoiding the need for the drive unit or motor 1 to cope with the high temperatures within the annealing furnace.

[0041] Furthermore, the connecting rod 15 includes a rod portion and a cap portion. The rod portion is provided with a radial through hole 16 at one end away from the cap portion for passing a steel wire. The diameter of the cap portion is larger than the diameter of the restricted hole 9. The diameter of the restricted hole 9 is greater than or equal to the diameter of the rod portion and smaller than the sum of the diameter of the rod portion and the diameter of the steel wire. When the connecting rod 15 connects the lead screw nut 2 and the frame 7, the portion of the steel wire passing through the radial through hole 16 is in a bent state to limit the connecting rod 15. It should be understood that by passing the connecting rod 15 through the restricted member 8, the limiting member 4, and the limiting member 8 in sequence, passing the steel wire through the radial through hole 16 of the connecting rod 15, and bending the portion of the steel wire outside the radial through hole 16, the connection between the limiting member 8 and the limiting member 4 can be completed, and the connecting rod 15 can be prevented from accidentally slipping out of the restricted hole 9 of the limiting member 8. The limit on the connecting rod 15 can be released by straightening the steel wire again and pulling it out of the radial through hole 16.

[0042] like Figures 7 to 10 As shown, an embodiment of the present invention provides an annealing furnace, which includes a furnace body 17 and the aforementioned feeding device; the furnace body 17 is provided with an opening for the feeding vehicle to enter and exit, and is adapted to the furnace door; the lead screw and the limiting edge 3 pass through the opening; the motor 1 is located outside the furnace body 17.

[0043] Furthermore, the furnace door comprises a main body 18 and a lifting portion 19. One side of the main body 18 is hingedly connected to the furnace body 17 via a vertically extending hinge axis. The bottom end of the main body 18 is higher than or flush with the top of the lead screw and the limiting rib 3. Two vertically extending slide grooves 20 are provided on the outer side of the main body 18, and the two slide grooves 20 limit the sides of the lifting portion 19. The bottom of the lifting portion 19 is provided with notches 21 at positions corresponding to the lead screw and the limiting rib 3. The bottom of the main body 18 is provided with a support portion 22, which corresponds to the notch 21 of the lifting portion 19. It should be understood that by pulling the lifting portion 19 upward, the furnace door can be moved away from the lead screw and limiting rib 3 below, allowing the furnace door to be opened from one side. After closing the main body 18, the lifting portion 19 is lowered to seal the furnace door from the annealing furnace opening. The furnace door adopts the above-mentioned structure and can be opened from one side. There is no need to use the upside-down flipping method to avoid the lead screw and the limiting edge 3 when opening and closing the furnace door, which is more convenient and labor-saving.

[0044] Furthermore, the lifting portion 19 is provided with a lug for connecting a pull rope 23; the upper end of the pull rope 23 is wound around a winch 24, which is mounted on the main body 18; the winch 24 has an extended arm extending radially outward, the outer end of which has a mounting hole for mounting a handle 25; the handle 25 can slide along the mounting hole, and each end of the handle 25 has a stopper 26 to prevent the handle 25 from falling out of the mounting hole; the main body 18 has a positioning hole 27 for inserting the end of the handle 25. It should be understood that when it is necessary to open the opening of the annealing furnace, the handle 25 is pulled out of the positioning hole 27, and the winch 24 is rotated to reel the pull rope 23 upward, thereby pulling the lifting portion 19 upward; by reinserting the handle 25 into the positioning hole 27, the lifting portion 19 can remain in the pulled-up state, thereby allowing the entire furnace door to be opened from one side. When the opening of the annealing furnace needs to be closed, the main body 18 is first buckled back into the opening of the annealing furnace; then the handle 25 is pulled out from the positioning hole 27, and the winch 24 is rotated to reel the pull rope 23 downward, so that the lifting part 19 can be lowered and cooperate with the main body 18 to close the opening of the annealing furnace.

[0045] Although specific embodiments of the present invention are described above, those skilled in the art should understand that various changes or modifications may be made to these embodiments without departing from the principles and essence of the present invention, and that these changes and modifications fall within the scope of protection of the present invention.

Claims

1. Annealing furnace, characterized in that include: Furnace body (17) and feeding device; The furnace body (17) is provided with an opening for a feeding vehicle to enter and exit, and is adapted to fit a furnace door; The lead screw and the limiting edge (3) pass through the opening; The motor (1) is located outside the furnace body (17); The feeding device comprises: Connecting rod (15) and feeding car; The connecting rod (15) passes through the limiting hole (9) of the limiting member (8) and the limiting hole (5) of the limiting member (4), thereby forming a connection between the lead screw nut (2) and the vehicle frame (7); The feeding vehicle comprises: The guide rail mechanism, used in conjunction with the feeding trolley, includes: a lead screw extending in a front-to-rear direction; and a motor (1) for driving the lead screw; and a lead screw nut (2) mounted on the lead screw; and Limiting edges (3) provided on the left and right sides of the lead screw; in, The limiting edges (3) extend in the front-to-back direction, and the space between the two limiting edges (3) constitutes a limiting channel; The screw nut (2) is mounted with a limiting member (4), and the limiting member (4) has limiting holes (5) passing through the left and right sides thereof; Frame (7); and Two rows of rollers mounted on the bottom of the frame (7); in, The distance between the outer sides of the two rows of rollers is the same as the distance between the inner sides of the two limiting edges (3); The bottom of the vehicle frame (7) is provided with downwardly extending limiting members (8) on the left and right sides respectively, and the limiting member (8) has limiting holes (9) penetrating the left and right sides thereof; The restricted hole (9) and the limiting hole (5) have the same height; The front end of the vehicle frame (7) is provided with front connecting parts (10) on the left, middle and right, respectively, and the rear end of the vehicle frame (7) is provided with rear connecting parts (11) on the left, middle and right, respectively. The front connecting portion (10) and the rear connecting portion (11) are respectively provided with a first pin hole passing through the upper and lower parts; The front connecting portion (10) of the feeding vehicle corresponds to the rear connecting portion (11) of the front adjacent feeding vehicle in the vertical direction, and is connected via a latch (12) passing through the first pin hole; The middle portion of the latch pin (12) has a restricted ring portion, and the diameter of the restricted ring portion is larger than the aperture of the pin hole; Also includes a connecting member (13); The connecting member (13) has a plurality of second pin holes (28) extending through the upper and lower surfaces for the insertion of the plug pins (12); The connecting member (13) further has a fork hole (14) extending through the front and rear surfaces to allow the fork of an electric forklift to pass through; The furnace door comprises a main body (18) and a lifting part (19), and one side of the main body (18) is hinged to the furnace body (17) via a hinge shaft extending up and down; The bottom end of the main body (18) is higher than or flush with the top end of the lead screw and the limiting edge (3); The main body (18) is provided with two sliding grooves (20) extending in the up-down direction on the outer side, and the two sliding grooves (20) constitute a limit for both sides of the lifting part (19); The bottom of the lifting portion (19) is provided with notches (21) at positions corresponding to the lead screw and the limiting edge (3); A support portion (22) is provided at the bottom of the main body portion (18), and the support portion (22) corresponds to the notch (21) of the lifting portion (19).

2. The annealing furnace according to claim 1, characterized in that: The two limiting edges (3) are respectively connected to a guide edge (6) at the left end, and the space between the two guide edges (6) constitutes a guide channel; The distance between the two guide edges (6) gradually decreases from left to right, so that the guide channel gradually converges from left to right.

3. The annealing furnace according to claim 1, characterized in that: The connecting rod (15) comprises a rod portion and a cap portion, and the rod portion is provided with a radial through hole (16) for passing a steel wire at one end away from the cap portion; The diameter of the cap portion is larger than the aperture of the restricted hole (9); The diameter of the restricted hole (9) is greater than or equal to the diameter of the rod, and smaller than the sum of the diameter of the rod and the diameter of the wire; When the connecting rod (15) connects the lead screw nut (2) and the vehicle frame (7), the portion of the steel wire passing through the radial through hole (16) is in a bent state, thereby limiting the connecting rod (15).

4. The annealing furnace according to claim 1, characterized in that: The lifting portion (19) is provided with a hanging ear for connecting a pull rope (23); The upper end of the pull rope (23) is wound around a winch (24), and the winch (24) is mounted on the main body (18); The winch (24) has an extension arm extending radially outward, and the outer end of the extension arm has a mounting hole for mounting a handle (25); The handle (25) can slide along the mounting hole, and both ends of the handle (25) have limiting portions (26) for preventing the handle (25) from falling out of the mounting hole; the main body (18) has a positioning hole (27) for inserting the end of the handle (25).

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