A lifting tool for a riser pipe used in wheel casting and its lifting method

Abstract

The present invention relates to the technical field of aluminum alloy wheel casting, and discloses a lifting tool for a riser pipe used in wheel casting, which includes a cross bar and a hanging mechanism. The hanging mechanism is connected to the cross bar, and a lifting lug for clamping the riser pipe is arranged on the hanging mechanism. The hanging mechanism includes two suspension rods, which are arranged on the cross bar at a certain interval, with one end connected to the cross bar and the other end connected to the lifting lug. During the use of the present invention, operators can operate the lifting operation at a position far from the riser pipe, alleviating the high-temperature discomfort of the operators, reducing the labor intensity. At the same time, an anti-detachment structure is arranged between the lifting lug and the lifting position of the riser pipe, eliminating the risk of dropping during the lifting and replacement of the riser pipe, and ensuring the safety of production operations. It also includes a locking mechanism for locking and releasing the unfolded state of the lifting lug, further facilitating the operation, realizing the rapid disassembly and replacement of the riser pipe, and shortening the working hours of operators in the high-temperature radiation environment.

Description

Technical Field

[0001] The invention relates to the technical field of automobile wheel hub production, in particular to a lifting tool for a liquid riser pipe used for wheel casting. Background Art

[0002] The casting process of aluminum alloy wheels is carried out in a high-temperature environment. When replacing necessary auxiliary casting tools during the production process, operators often need to withstand the high-temperature working environment. The riser is an indispensable auxiliary tool for wheel casting. It is used as a channel for the circulation of aluminum liquid during the production process. In order to meet the process requirements, the riser often needs to be replaced and cleaned during operation. However, the riser is always working in a high-temperature environment of 650-700 degrees Celsius, making its lifting and replacement working conditions very bad and posing a greater operating risk.

[0003] The current method of replacing the riser pipe is usually that two people hold the carp-joint pliers in both hands, clamp the riser pipe and lift it out of the holding furnace. This process requires constant vigilance against safety hazards such as burns caused by the carp-joint pliers slipping, and places high demands on the strength of the hands of the two operators and the degree of cooperation. At the same time, due to the limitation of the working space, the use of tools with longer handles is not allowed, which causes the operators to inevitably be exposed to high temperature radiation at close range, causing physical discomfort.

[0004] Therefore, developing a convenient and reliable riser tube lifting and replacement tool is an urgent problem to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a lifting tool for a riser pipe for wheel casting, so as to solve the problems of high labor intensity and high operation risk during the lifting and replacement operation of the existing riser pipe.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A lifting tool for a liquid riser pipe for wheel casting comprises a cross bar and a hanging mechanism, wherein the upper end of the hanging mechanism is connected to the cross bar, and the lower end of the hanging mechanism is connected to a lifting ear for clamping the liquid riser pipe.

[0008] Preferably, the hanging mechanism includes two hanging rods, which are arranged on the cross bar at a certain horizontal interval, one end of which is connected to the cross bar, and the other end is connected to the lifting ear, the lifting ear has a lifting ring arranged corresponding to the lifting position of the riser pipe, the lifting ear can be fixed to the riser pipe through the lifting ring, and the interval between the two hanging rods corresponds to the lifting position of the riser pipe.

[0009] Furthermore, the suspension rod is hinged to the cross rod, so that the suspension rod can swing left and right with its hinged end as the axis, thereby achieving the purpose of adjusting the horizontal distance between the two lifting ears to facilitate the hanging operation.

[0010] Preferably, the hanging mechanism includes a swing rod and a connecting rod. The middle of the swing rod is hinged to the cross bar, the lower end of the swing rod is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the hanging rod.

[0011] Preferably, the swing rod is arranged in a bent shape, and the upper part of the swing rod is inclined and inclined towards the end of the cross bar.

[0012] Furthermore, a tension spring is connected between the upper end of the swing rod and the end of the cross bar away from the center.

[0013] Preferably, the hanging mechanism includes a push rod. The push rod vertically penetrates the cross bar and is slidably matched with the cross bar. The lower end of the push rod is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the hanging rod, so that the up and down movement of the push rod can drive the mirror image swing of the two hanging rods through the connecting rod, realizing the adjustment of the distance between the lifting lugs.

[0014] Furthermore, the top end of the push rod has a head with a size larger than the through hole on the cross bar, and a spring is arranged between the head and the cross bar.

[0015] Furthermore, the hanging mechanism further includes a locking mechanism for locking and releasing the unfolded state of the lifting lugs.

[0016] Preferably, the locking mechanism includes a self-locking tension spring. The two ends of the self-locking tension spring are respectively connected to the two hanging rods, so that the two hanging rods are kept in the initial state with the minimum unfolded distance under the action of the tension of the self-locking tension spring. A limiting part for limiting the extreme downward displacement of the push rod is arranged at the upper end of the push rod extending out of the cross bar. The bottom end of the push rod is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the hanging rod. The position of the limiting part is such that when the push rod moves downward, the hinge point of the push rod and the connecting rod is lower than the hinge point of the hanging rod and the connecting rod.

[0017] Preferably, the locking mechanism includes a locking platform arranged on the push rod. The locking platform protrudes from the push rod and corresponds to the wedge-shaped locking tongue. The wedge-shaped locking tongue is telescopically arranged outside the cross bar, and its wedge-shaped surface faces upward. An unlocking slider is arranged at the upper end of the locking platform. The unlocking slider is sleeved on the push rod and can slide up and down along the push rod. The upper surface of the unlocking slider is in the shape of an inclined polygon, and a depression for accommodating the locking platform is arranged on its lower surface. A spacer spring is arranged between the locking platform and the unlocking slider. The elastic force of the spacer spring is slightly greater than the gravity of the unlocking slider, so that the locking platform and the unlocking slider are in a separated state under normal conditions. When subjected to an external pressure, the unlocking slider can be made to approach the locking platform and accommodate the locking platform in the depression of the unlocking slider. The push rod is provided with a convex platform corresponding to the unlocking slider for pushing the unlocking slider downward to slide over the wedge-shaped locking tongue when unlocking. A guiding part corresponding to the push rod is arranged on the cross bar, and a head is arranged at the top end of the push rod. A spring is arranged between the head and the cross bar.

[0018] Furthermore, an anti-detachment structure is correspondingly arranged at the hoisting position of the lifting lug and the liquid-riser pipe.

[0019] Preferably, the anti - detachment structure is a toothed groove respectively opened on the contact surface between the lifting lug and the liquid - rising pipe.

[0020] Preferably, the anti - detachment structure is a barb structure correspondingly arranged at the hoisting position between the lifting lug and the liquid - rising pipe.

[0021] The beneficial effects of the present invention are as follows:

[0022] By arranging a hanging mechanism on the cross - bar, the present invention enables the operator to carry out the hoisting operation of the liquid - rising pipe away from the high - temperature area, alleviates the high - temperature discomfort of the operator, and reduces the labor intensity; and by pushing, pulling or pressing to adjust the hanging mechanism, the quick positioning connection between the lifting lug and the hoisting position of the liquid - rising pipe is realized, achieving the technical effect of quick disassembly and assembly in the lifting and replacement operation of the liquid - rising pipe, improving the operation efficiency and shortening the operation time of the operator in the high - temperature environment; at the same time, by arranging an anti - detachment structure at the hoisting position between the lifting lug and the liquid - rising pipe, the risk of dropping during the hoisting and replacement of the liquid - rising pipe is eliminated, ensuring the safety of production operations; and through the locking mechanism for locking and releasing the unfolded state of the lifting lug, the quick alignment and clamping between the lifting lug and the hoisting position are realized, further facilitating the operation, enhancing the effect of quick disassembly and replacement of the liquid - rising pipe, further improving the operation efficiency and shortening the working time of the operator in the high - temperature radiation environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0024] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention.

[0025] Figure 2 It is a side sectional view of the lifting lug.

[0026] Figure 3 It is a schematic structural diagram of the second embodiment.

[0027] Figure 4 For Figure 3 The enlarged schematic view at A in

[0028] Figure 5 It is a schematic structural diagram of the third embodiment.

[0029] Figure 6 For Figure 5 The enlarged schematic view at B in

[0030] Figure 7 For Figure 5 The schematic structural diagram of the adjusted state of the lifting lug.

[0031] Figure 8 It is a schematic structural diagram of the locked state of the fourth embodiment.

[0032] Figure 9 Structural schematic diagram of the unlocked and released state of the fourth embodiment.

[0033] Figure 10 Structural schematic diagram of the fifth embodiment.

[0034] Figure 11 For Figure 10 Enlarged structural schematic diagram at position C in

[0035] Figure 12 Structural schematic diagram of the unlocked state of the fifth embodiment.

[0036] In the figure: 1 - cross bar; guiding part 11; 2 - hanging mechanism; 21 - hanging rod; 22 - swing rod; 23 - connecting rod; 24 - tension spring; 25 - push rod; 26 - spring; 3 - lifting lug; 31 - anti - detachment structure; 4 - liquid - rising pipe; 41 - lifting position; 51 - locking platform; 52 - wedge - shaped locking tongue; 53 - unlocking slider; 54 - spacer spring; 55 - self - locking spring; 56 - limiting part. Detailed implementation manners

[0037] As Figure 1-7 shown, a lifting tool for a liquid - rising pipe used in wheel casting includes a cross bar 1 and a hanging mechanism. The upper end of the hanging mechanism is connected to the cross bar 1, and the lower end of the hanging mechanism is connected to a lifting lug 3 for clamping the lifting position 41 of the liquid - rising pipe 4. During use, the lifting lug 3 is clamped on the lifting position 41 of the liquid - rising pipe 4, and the operator holds the cross bar 1 and pulls it upward. The cross bar 1 drives the hanging mechanism to move upward, lifting the liquid - rising pipe 4, thereby quickly completing the lifting and replacement operation of the liquid - rising pipe.

[0038] As the first embodiment of the present invention, as Figure 1 shown, the hanging mechanism includes two hanging rods 21. The hanging rods 21 are arranged on the cross bar 1 at a certain horizontal interval. Their upper ends are connected to the cross bar 1, and their lower ends are connected to the lifting lug 3. The lifting lug 3 has a hanging ring corresponding to the lifting position 41 of the liquid - rising pipe 4, and the lifting lug 3 can be clamped on the liquid - rising pipe 4 through the hanging ring. The interval between the two hanging rods 21 corresponds to the lifting position 41 of the liquid - rising pipe 4.

[0039] Preferably, the hanging rod 21 is hinged to the cross bar 1, enabling the hanging rod 21 to swing left and right around its hinged end, so as to adjust the expanded interval between the two lifting lugs 3, thereby adapting to the size of the lifting position 41 of the liquid - rising pipe 4 and facilitating the alignment operation between the lifting lug 3 and the lifting position 41.

[0040] As the second embodiment, as Figures 3 to 4As shown, the hanging mechanism includes a swing rod 22 and a connecting rod 23. The middle of the swing rod 22 is hinged to the cross bar 1, the lower end thereof is hinged to one end of the connecting rod 23, and the other end of the connecting rod 23 is hinged to the hanging rod 21, forming a four-bar mechanism. By pushing and pulling the swing rod 22 left and right, the swing of the lower end of the swing rod 22 can be driven, and the left and right swing of the hanging rod 21 is formed through the connecting rod 23, so as to achieve the purpose of adjusting the expansion distance between the two hanging rings 3.

[0041] Preferably, the swing rod 22 is arranged in a bent shape, and the upper part of the swing rod 22 is inclined and inclined towards the end of the cross bar 1, close to the standing position of the operator, which is convenient for the operator to hold the upper end of the swing rod 22 to complete the adjustment of the expansion distance of the hanging ear 3, so that the operator is away from the heat source, and at the same time, the vertical dimension of the hanging mechanism is shortened, which is more suitable for operation in a confined space.

[0042] Furthermore, a tension spring 24 is connected between the upper end of the swing rod 22 and the end of the cross bar 1 away from the center, so that the swing rod 22 can be fixed in place by the pulling force of the tension spring 24 to maintain the relative position of the hanging ear 3 and prevent the liquid lifting pipe 4 from slipping and falling during the hanging operation. In this embodiment, by swinging the upper end of the swing rod 22, the adjustment of the expansion distance of the hanging ear 3 can be realized, so that the operator is away from the high-temperature radiation, relieving the discomfort caused by the high temperature. At the same time, it is convenient for the alignment operation of the hanging ear 3 and the hoisting position 41, and the lifting and replacement operation of the liquid lifting pipe 4 can be quickly completed.

[0043] As a third embodiment, as Figures 5 to 7 shown, the hanging mechanism includes a push rod 25. The push rod 25 vertically penetrates the cross bar 1 and is slidably matched with the cross bar 1. The lower end of the push rod 25 is hinged to one end of the connecting rod 23, and the other end of the connecting rod 23 is hinged to the hanging rod 21, so that the up and down movement of the push rod 25 can drive the mirror image swing of the two hanging rods 21 through the connecting rod 23 to realize the adjustment of the expansion distance of the hanging ear 3, so as to facilitate the positioning and fixing of the front hanging ear 3 and the hoisting position 41 of the liquid lifting pipe 4 before hanging. When the push rod 25 is pressed downward, the expansion distance between the two hanging ears 3 becomes larger, so that the front end of the hanging ear 3 can cross the hoisting position 41 of the liquid lifting pipe 4, and the hanging ring is aligned with the hoisting position 41. When the push rod 25 is lifted upward, the expansion distance of the hanging ear 3 is reduced and the hanging ring is sleeved on the hoisting position 41 to complete the positioning and fixing of the hanging ear 3 and the hoisting position 41 of the liquid lifting pipe 4. In this embodiment, the operator can complete the rapid positioning and connection operation of the hanging ear 3 and the hoisting position 41 of the liquid lifting pipe 4 by pressing the push rod 25 alone, which further facilitates the operation and reduces the operation time of the operator in the high-temperature environment.

[0044] Preferably, the top end of the push rod 25 has a head larger than the through hole on the cross bar 1, and a spring 26 is arranged between the head and the cross bar 1 to realize the return fixing of the hanging ear 3 through the pushing force of the spring 26.

[0045] Furthermore, as Figure 4As shown in the figure, an anti - detachment structure is correspondingly arranged at the lifting position 41 of the lifting lug 3 and the liquid - lifting pipe 4. The anti - detachment structure can be a toothed groove respectively opened on the contact surface between the lifting lug 3 and the lifting position 41. By means of the toothed groove, the relative movement between the lifting lug 3 and the lifting position 41 is restricted, playing a role in preventing the liquid - lifting pipe 4 from falling off during the lifting process. The anti - detachment structure can also be a barb structure correspondingly arranged at the lifting position 41 of the lifting lug 3 and the liquid - lifting pipe 4. The anti - detachment mechanism eliminates the hidden danger of the liquid - lifting pipe 4 slipping during the lifting operation and ensures the operation safety.

[0046] Through the above - mentioned implementation manners, the purpose of quickly disassembling and replacing the liquid - lifting pipe 4 is achieved. However, during the actual use process, the operators found that there is still room for further improvement. For example, during the operation, the operator needs to hold the cross bar 1 with one hand and press the push rod 25 or swing the swing rod 22 with the other hand to adjust the expansion distance of the lifting lug 3 to align with the lifting position 41. During this process, both hands need to be always on the tooling, which is not conducive to the positioning and adjustment of the lifting lug 3 and is not convenient for operation. In view of this, a locking mechanism that can lock and release the expanded state of the lifting lug 3 is further developed and applied to the above - mentioned embodiment, so as to avoid the operation state where the operator must operate with both hands simultaneously, which will greatly improve the operation convenience and further improve the operation efficiency.

[0047] Such as Figure 8As shown, as a fourth embodiment, the hanging mechanism further includes a locking mechanism for locking and releasing the unfolded state of the lifting lug 3. The locking mechanism includes a self-locking tension spring 55. Two ends of the self-locking tension spring 55 are respectively connected to two suspender rods 21, so that the two suspender rods 21 are kept in an initial state with the minimum unfolded distance under the action of the tension of the self-locking tension spring 55. A limiting portion 56 with a size larger than the through-hole size of the sliding fit between the push rod 25 and the cross bar 1 is provided at the upper end of the cross bar 1 where the push rod 25 extends out, for limiting the extreme downward displacement of the push rod 25. One end of a connecting rod 23 is hinged to the bottom end of the push rod 25, and the other end of the connecting rod 23 is hinged to the suspender rod 21. The setting position of the limiting portion 56 needs to ensure that when the push rod 25 moves downward, the hinge point of the push rod 25 and the connecting rod 23 is lower than the hinge point of the suspender rod 21 and the connecting rod 23. At this time, the hinge point at the bottom end of the push rod 25 receives a downward pulling force generated by the self-locking tension spring 55 through the suspender rod 21 and the connecting rod 23. At the same time, the upward movement of the push rod 25 is restricted by the limiting portion 56 at the upper end of the push rod 25, so that the mechanism is self-locked, and the unfolded distance of the lifting lug 3 is locked in a larger state. During use, the operator only needs to hold the cross bar 1 with one hand, and can conveniently complete the alignment of the lifting lug 3 and the hoisting position 41 of the liquid lifting pipe 4, saving the trouble of holding the cross bar 1 with one hand and pressing the push rod with the other hand, making the alignment of the lifting lug 3 and the hoisting position 41 of the liquid lifting pipe 4 more accurate and fast, and reducing the time for the operator to bear high-temperature radiation. After the alignment is completed, the push rod 25 is pulled upward. When the hinge point of the push rod 25 and the connecting rod 23 is higher than the hinge point of the suspender rod 21 and the connecting rod 23, unlocking can be achieved. At this time, under the upward thrust generated by the self-locking tension spring 55 through the suspender rod 21 and the connecting rod 23, the push rod 25 pulls the two suspender rods 21 to swing towards the center through the tension of the self-locking tension spring 55, drives the push rod 25 to slide upward through the connecting rod 23, and finally stops below the cross bar 1 at the hinge joint of the push rod 25 and the connecting rod 23, completing the positioning and fixation of the lifting lug 3 at the hoisting position 41.

[0048] The structure of the above embodiment is simple, convenient for manufacturing and assembly, and easy to implement. At the same time, it solves the actual problems in the on-site operation process, enabling the operator to free one hand and perform alignment connection with the lifting lug 3 in the locked state and the hoisting position 41, with higher operation accuracy and stronger flexibility.

[0049] As a fifth embodiment, as shown in the figure, the locking mechanism includes a locking platform 51 provided on the push rod 25. The locking platform 51 protrudes from the push rod 25 and is arranged corresponding to the wedge-shaped locking tongue 52. The wedge-shaped locking tongue 52 is telescopically arranged outside the cross bar 1, and its wedge-shaped surface faces upward, so that the locking platform 51 can force the wedge-shaped locking tongue 52 to retract away from the locking platform 51 through sliding cooperation with the wedge-shaped surface, and the locking platform 51 finally slides past the wedge-shaped locking tongue 52 and is located below the wedge-shaped locking tongue 52. At this time, due to the action of the restoring force, the wedge-shaped locking tongue 52 extends towards the center direction and locks the locking platform 51 below the wedge-shaped locking tongue 52. An unlocking slider 53 is arranged at the upper end of the locking platform 51. The unlocking slider 53 is sleeved on the push rod 25 and can slide up and down along the push rod 25, and is used for unlocking and releasing the locked state of the locking platform 51. The upper surface of the unlocking slider 53 is in a trapezoidal shape, and a depression corresponding to the locking platform 51 is provided on its lower surface, so that the locking platform 51 can be accommodated in the depression. A spacer spring 54 is arranged between the locking platform 51 and the unlocking slider 53. The elastic force of the spacer spring can only overcome the gravity of the unlocking slider 53, so that the locking platform 51 and the unlocking slider 53 are in a separated state under normal conditions. When an external pressure is applied, the unlocking slider 53 can approach the locking platform 51 and accommodate the locking platform 51 in the depression of the unlocking slider 53. The push rod 25 is provided with a boss corresponding to the unlocking slider 53, which is used to push the unlocking slider 53 downward and slide past the wedge-shaped locking tongue 52 during unlocking. The cross bar 1 is provided with a guiding portion 11 corresponding to the push rod 25 to ensure that the push rod 25 moves along a predetermined trajectory. A head is arranged at the top end of the push rod 25, and a spring 26 is arranged between the head and the cross bar 1 to provide a restoring thrust for the structure.

[0050] During use, by pressing the end of the push rod 25, the locking platform 51 moves downward. At this time, the locking platform 51 and the unlocking slider 53 are in a separated state due to the elastic force of the spacer spring 54. Continuing to move the locking platform 51 downward, it contacts the wedge surface of the wedge locking tongue 52, forcing the wedge locking tongue 52 to retract, and thus smoothly sliding past the wedge locking tongue 52. After the locking platform 51 disengages from the wedge locking tongue 52, the wedge locking tongue 52 automatically resets and extends, and locks the locking platform 51 at the bottom of the wedge locking tongue 52. At this time, the unlocking slider 53 stays above the wedge locking tongue 52 due to the action of the spacer spring 54, that is, the locking of the locking mechanism is completed, locking the lifting lug 3 at a larger unfolded size, facilitating the single-handed alignment operation of the lifting lug 3 and the lifting position 41 by the operator. After the alignment is completed, press the push rod 25 again, so that the convex platform provided on the push rod 25 corresponding to the unlocking slider 53 pushes the unlocking slider 53 downward. The lower end of the unlocking slider 53 contacts the wedge surface of the wedge locking tongue 52. Continuing to press the push rod 25, the unlocking slider 53 and the wedge surface of the wedge locking tongue 52 slide, forcing the wedge locking tongue 52 to retract, so that the unlocking slider 53 passes through the wedge locking tongue 52 and is below the wedge locking tongue 52 together with the locking platform 51. At this time, stop pressing, and the push rod 25 will move upward under the action of the spring 26 and drive the locking platform 51 to move upward synchronously. The locking platform 51 jacks up the unlocking slider 53 through the spacer spring 54. When the upper end of the unlocking slider 53 contacts the lower end of the wedge locking tongue 52, the spacer spring 54 between the unlocking slider 53 and the locking platform 51 is compressed due to the resistance of the wedge locking tongue 52. The locking platform 51 and the unlocking slider 53 gradually approach and are finally accommodated in the recess of the unlocking slider 53. The elastic force of the spring 26 continues to push the push rod 25 upward. When this elastic force overcomes the friction between the upper inclined surface of the unlocking slider 53 and the wedge locking tongue 52, the upper inclined surface of the unlocking slider 53 will slide with the wedge locking tongue 52 and finally drive the locking platform 51 to continue to move upward, getting rid of the restriction of the wedge locking tongue 52 and completing the unlocking. Thus, the lifting lug 3 can be conveniently and quickly positioned on the lifting position 41.

[0051] The above embodiment utilizes the ingenious external structure of the unlocking slider 53 to achieve the purpose of leading the locking platform 25 to unlock. The operator can achieve the expansion and locking of the lifting lug 3 by pressing once, and the quick unlocking and resetting of the lifting lug 3 by pressing twice, completing the quick positioning and clamping of the lifting lug 3 and the lifting position 41, thus realizing the quick disassembly and assembly operation of the liquid lifting pipe 4.

[0052] The locking mechanism can also adopt structures such as ratchets, all aiming to achieve the quick hoisting and replacement of the liquid lifting pipe 4 and improve the convenience of use of the present invention.

[0053] A method for hoisting the liquid lifting pipe 4 using the tooling of the present invention includes the following steps:

[0054] (1) Operate the push rod 25 to lock the tooling in the state where the lifting lug 3 is unfolded;

[0055] (2) Align the lifting lug 3 with the lifting position 41 of the liquid-riser pipe 4;

[0056] (3) Operate the push rod 25 again to quickly return the lifting lug 3 and lock it in the lifting position 41 of the liquid-riser pipe 4.

[0057] The specific embodiments of the present patent disclosed above are only for illustration, but the present patent is not limited thereto. For those of ordinary skill in the art, any modifications made without departing from the principles of the present invention shall be considered as falling within the scope of protection of the present invention.

Claims

1. A lifting tool for a riser pipe used in wheel casting, characterized in that: It includes a cross bar (1) and a hanging mechanism. The hanging mechanism is hinged to the cross bar (1), and an ear (3) for clamping and fixing the lifting position (41) of the lifting pipe (4) is arranged on the hanging mechanism. The hanging mechanism includes two suspension rods (21). The suspension rods (21) are arranged on the cross bar (1) at a certain interval, with one end connected to the cross bar (1) and the other end connected to the ear (3). The hanging mechanism includes a swing rod (22) and a connecting rod (23). The middle of the swing rod (22) is hinged to the cross bar (1), its lower end is hinged to one end of the connecting rod (23), the other end of the connecting rod (23) is hinged to the suspension rod (21), and a tension spring (24) is connected between the upper end of the swing rod (22) and the end of the cross bar (1) away from the center. The hanging mechanism includes a push rod (25). The push rod (25) vertically penetrates the cross bar (1) and is in sliding fit with the cross bar (1). The lower end of the push rod (25) is hinged to one end of the connecting rod (23), the other end of the connecting rod (23) is hinged to the suspension rod (21), the top end of the push rod (25) has an end head larger than the through hole on the cross bar (1), and a spring (26) is arranged between the end head and the cross bar (1). The hanging mechanism further includes a locking mechanism for locking and releasing the unfolded state of the ear (3). The locking mechanism includes a self-locking tension spring (55). The two ends of the self-locking tension spring (55) are respectively connected to the two suspension rods (21), so that the two suspension rods (21) are kept in the initial state with the minimum unfolded interval under the action of the tension of the self-locking tension spring (55). A limiting part (56) for limiting the extreme downward displacement of the push rod (25) is arranged at the upper end of the push rod (25) extending out of the cross bar (1). The bottom end of the push rod (25) is hinged to one end of the connecting rod (23), the other end of the connecting rod (23) is hinged to the suspension rod (21), and the setting position of the limiting part (56) can make the hinge point of the push rod (25) and the connecting rod (23) lower than the hinge point of the suspension rod (21) and the connecting rod (23) when the push rod (25) moves downward. Or the locking mechanism includes a locking platform (51) provided on the push rod (25). The locking platform (51) protrudes from the push rod (25) and is arranged corresponding to the wedge-shaped locking tongue (52). The wedge-shaped locking tongue (52) is telescopically arranged outside the cross bar (1), and its wedge surface faces upward. An unlocking slider (53) is arranged at the upper end of the locking platform (51). The unlocking slider (53) is sleeved on the push rod (25) and can slide up and down along the push rod (25). The upper surface of the unlocking slider (53) is in a bevel shape, and a recess for accommodating the locking platform (51) is provided on its lower surface. A spacer spring (54) is arranged between the locking platform (51) and the unlocking slider (53). The elastic force of the spacer spring is slightly greater than the gravity of the unlocking slider (53), so that the locking platform (51) and the unlocking slider (53) are in a separated state under normal conditions. When an external pressure is applied, the unlocking slider (53) can be made to approach the locking platform (51) and accommodate the locking platform (51) in the recess of the unlocking slider (53). The push rod (25) is provided with a convex platform corresponding to the unlocking slider (53) for pushing the unlocking slider (53) downward and sliding over the wedge-shaped locking tongue (52) during unlocking. A guiding portion (11) corresponding to the push rod (25) is arranged on the cross bar (1). A head is arranged at the top end of the push rod (25), and a spring (26) is arranged between the head and the cross bar (1).

2. The lifting tool for the riser pipe used in wheel casting according to claim 1, characterized in that: The lifting lug (3) and the lifting position of the liquid lifting pipe (4) are correspondingly provided with an anti-detachment structure.

3. The lifting tool for the riser pipe used in wheel casting according to claim 2, characterized in that: The anti-detachment structure is a toothed groove respectively opened on the contact surface between the lifting lug (3) and the liquid lifting pipe (4).

4. A method for hoisting a riser pipe using the hoisting tooling as described in claim 1, characterized in that, It includes the following steps: 1) Operate the push rod (25) to lock the tooling in the state where the lifting lug (3) is unfolded; 2) Align the lifting lug (3) with the lifting position (41) of the liquid lifting pipe (4); 3) Operate the push rod (25) again to make the lifting lug (3) quickly return to its position and be clamped and fixed on the lifting position (41) of the liquid lifting pipe (4).

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