Sand core lifting appliance for nodular cast iron pipe

Abstract

The utility model discloses a nodular cast iron pipe sand core lifting appliance which comprises a central column, a lifting part is arranged at the top end of the central column, the central column is connected with a fixing support, the fixing support is connected with an annular framework located on the outer ring of the central column, and a plurality of first guide sleeves are arranged at the bottom of the annular framework. A telescopic rod is slidably arranged in the first guide sleeve, a bearing plate is arranged at the outer end of the telescopic rod, a first connecting rod is rotationally connected to the inner end of the telescopic rod, a movable ring is slidably arranged on the center column, the first connecting rod is rotationally connected with the movable ring, and a reset spring used for being connected with the movable ring is arranged on the center column. The movable ring is rotationally connected with a second connecting rod, an operating rod is rotationally arranged on the center column and rotationally connected with the second connecting rod, a first locking part is arranged on the operating rod, and a second locking part used for being matched with the first locking part is arranged on the fixing support. The hoisting device has the advantages of convenience in positioning, stability in hoisting and simplicity in operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of hangers, and in particular relates to a ductile iron pipe sand core hanger. Background Art

[0002] Ductile iron pipes are made of magnesium or rare earth magnesium combined with metal spheroidizers added to molten iron before pouring to spheroidize graphite and reduce stress concentration. The pipes have the advantages of high strength, high elongation, impact resistance, corrosion resistance, and good sealing. The inner wall is lined with cement mortar, which improves the pipeline water supply environment, increases water supply capacity, and reduces energy consumption. The pipe mouth adopts a flexible interface, and the pipe itself has a large elongation, which makes the pipe more flexible. In the buried pipeline, it can work together with the soil around the pipeline, improve the stress state of the pipeline, and thus improve the reliability of the pipeline network operation. Therefore, my country's water supply industry usually uses ductile iron pipes as main pipe fittings.

[0003] Sand core is the material used to make core in casting production, which is composed of casting sand and sand binder.

[0004] Ductile iron pipe products are mainly used in urban water supply projects. They have the characteristics of long life, pressure resistance, and easy installation and construction. During the production process, a sand core needs to be installed at the socket end of the pipe mold. The sand core is made of sand and adhesive pressed together. The large-diameter ductile iron pipe sand core is heavy, fragile, and inconvenient to carry.

[0005] The problem with the existing technology is that in the production process of ductile iron pipes, there is a lack of mature lifting equipment, the positioning between the lifting equipment and the sand core is inconvenient, and the sand core is easily knocked during positioning, causing damage to the sand core surface. The lifting operation is complicated and the labor intensity of employees is high; the connection between the lifting equipment and the sand core is not stable enough, and there is a risk of the sand core falling. Summary of the invention

[0006] The utility model aims to provide a ductile iron pipe sand core hanger for the problems existing in the prior art, which has the advantages of convenient positioning, stable hoisting and simple operation.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a ductile iron pipe sand core hanger, comprising a center column, the top of the center column is provided with a lifting part, the center column is connected to a fixed bracket, the fixed bracket is connected to an annular frame located in the outer circle of the center column, a plurality of guide sleeves are provided at the bottom of the annular frame, a telescopic rod is slidably provided in the guide sleeve, a supporting plate is provided at the outer end of the telescopic rod, a connecting rod is rotatably connected to the inner end of the telescopic rod, a movable ring is slidably provided on the center column, and the connecting rod is rotatably connected to the movable ring, a reset spring for connecting the movable ring is provided on the center column, the movable ring is rotatably connected to a connecting rod two, an operating rod is rotatably provided on the center column, the operating rod is rotatably connected to the connecting rod two, a locking part one is provided on the operating rod, and a locking part two for cooperating with the locking part one is provided on the fixed bracket.

[0008] The sling is lifted by the lifting part on the center part, the annular frame is connected and fixed to the center column by a fixed bracket, and a plurality of guide sleeves are arranged along the circumferential direction at the bottom of the annular frame to slidably connect the telescopic rod. The supporting plate at the outer end of the telescopic rod is used to position the sand core and provide lifting force. The movable ring is slidably arranged on the center column, and the movable ring and the operating rod are rotated and connected at both ends of the connecting rod. The movable ring is driven to move up and down by moving the operating rod, and the telescopic rod and the movable ring are rotated and connected at both ends of the connecting rod one to realize the telescopic movement of the telescopic rod when the movable ring is displaced up and down. The operating rod is reset upward by the reset spring to retract the telescopic rod, so as to avoid affecting the installation and disassembly of the sand core and facilitate use. When the operating rod is pressed down, the locking part one cooperates with the locking part two to lock the operating rod, so that the supporting plate on the telescopic rod provides a stable supporting force for the sand core, thereby ensuring safe and stable lifting.

[0009] Furthermore, a plurality of pressing plates for cooperating with the sand core are arranged on the annular skeleton, a reinforcing rod is arranged between the pressing plate and the central column, and a plurality of supporting feet are arranged at the bottom of the annular skeleton.

[0010] The pressure plate is used to cooperate with the support plate to limit the position of the sand core, limit the movement of the sand core during the lifting process, ensure the stability of the lifting, and set the reinforcement rod to improve the stability of the pressure plate connection. The support feet are used to place the lifting device on the ground when it is not in use to prevent the functional parts from contacting the ground and being damaged.

[0011] Furthermore, the supporting plate comprises a flat plate, and a connecting portion for connecting to the telescopic rod is provided at the bottom of the flat plate.

[0012] The flat plate structure is convenient for supporting the sand core and is connected and fixed with the telescopic rod through the connecting part.

[0013] Furthermore, the first locking part includes a movable hook body arranged on the operating rod, and the second locking part includes a fixing pin for cooperating with the movable hook body.

[0014] The operating rod is positioned by cooperating with the movable hook body and the fixing pin to prevent the telescopic rod from retracting during hoisting.

[0015] Furthermore, the support plate is connected to a support rod, a plurality of guide sleeves 2 are provided on the annular frame, and the support rod is slidably connected to the guide sleeves 2.

[0016] The guide sleeve 2 is slidably matched with the support rod to provide support force to the support plate, thereby ensuring the support effect on the sand core.

[0017] Furthermore, the top end of the return spring is connected to the movable ring, and the bottom end of the return spring is connected to the fixed bracket.

[0018] By connecting and positioning the two ends of the return spring with the movable ring and the fixed bracket respectively, the structure is simple and easy to use.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. The transmission between the operating rod and the telescopic rod is realized by setting a movable ring and a ring frame with a guide sleeve on the central column, and cooperating with a connecting rod. The operating rod can be used to synchronously extend and retract several telescopic rods, and the supporting plate can be used to support and position the step surface inside the sand core. The telescopic distance of the telescopic rod can be freely adjusted, which is convenient for positioning between the hanger and the sand core, and the operation is simple and the positioning is convenient;

[0021] 2. By setting a number of telescopic rods, the sand core is supported and positioned in cooperation with the supporting plates on the telescopic rods, and the locking part 1 and the locking part 2 are used to prevent the telescopic rod from retracting, so that the hoisting is stable; the pressure plate and the supporting plate are used to limit the up and down displacement of the sand core, and the support rod strengthens the connection strength between the supporting plate and the annular frame, so as to ensure the positioning stability during the hoisting process;

[0022] 3. The resetting spring applies a resetting elastic force to the movable ring, and cooperates with the locking part 1 and the locking part 2. The telescopic rod can be easily extended, locked, unlocked and recovered through the operating rod and the movable hook body, and the sand core grabbing and releasing operations are simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A structural top view of a ductile iron pipe sand core hanger according to Example 1 of the utility model;

[0024] Figure 2 for Figure 1 Schematic diagram of the cross section at AA in the middle;

[0025] Figure 3 for Figure 1Schematic diagram of the cross section at the middle BB;

[0026] Figure 4 This is a structural schematic diagram of the guide sleeve 1 in Example 1 of the utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the support rod in Example 2 of the utility model;

[0028] In the figure: 1. center column; 2. lifting ring; 3. oblique rod; 4. pressure plate; 5. annular frame; 6. transverse connecting rod; 7. supporting foot; 8. movable ring; 9. connecting rod 1; 10. telescopic rod; 11. supporting plate; 111. flat plate; 112. connecting part; 12. guide sleeve 1; 13. return spring; 14. operating rod; 15. connecting rod 2; 16. movable hook body; 17. fixing pin; 18. supporting rod; 19. guide sleeve 2; 20. retaining spring; 21. nylon sleeve; 22. sand core. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative labor are within the scope of protection of the utility model. In the description of the utility model, it should be noted that the terms front, back, left, right, etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships in which the utility model product is usually placed when used. They are only for the convenience of describing the utility model or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] Example 1

[0031] like Figure 1-4As shown, a ductile iron pipe sand core 22 hanger comprises a center column 1, a lifting part is provided at the top of the center column 1, the center column 1 is connected to a fixed bracket, the fixed bracket is connected to an annular skeleton 5 located at the outer circle of the center column 1, a plurality of guide sleeves 12 are provided at the bottom of the annular skeleton 5, a telescopic rod 10 is slidably provided in the guide sleeve 12, a supporting plate 11 is provided at the outer end of the telescopic rod 10, a connecting rod 19 is rotatably connected to the inner end of the telescopic rod 10, a movable ring 8 is slidably provided on the center column 1, the connecting rods 19 are all rotatably connected to the movable ring 8, a reset spring 13 for connecting the movable ring 8 is provided on the center column 1, the movable ring 8 is rotatably connected to the connecting rod 2 15, an operating rod 14 is rotatably provided on the center column 1, the operating rod 14 is rotatably connected to the connecting rod 2 15, a locking part 1 is provided on the operating rod 14, and a locking part 2 for cooperating with the locking part 1 is provided on the fixed bracket.

[0032] In the above scheme, the lifting device is lifted by the lifting part on the center part, the annular frame 5 is connected and fixed to the center column 1 by a fixed bracket, and a plurality of guide sleeves 12 are arranged at the bottom of the annular frame 5 along the circumferential direction to slidably connect the telescopic rod 10. The supporting plate 11 at the outer end of the telescopic rod 10 is used to position the sand core 22 and provide lifting force. The movable ring 8 is slidably arranged on the center column 1, and the movable ring 8 and the operating rod 14 are rotatably connected at both ends of the connecting rod 15. The movable ring 8 is driven by moving the operating rod 14. The movable ring 8 is connected to the telescopic rod 10 by rotating at both ends of the connecting rod 9, so as to drive the telescopic rod 10 to move telescopically when the movable ring 8 moves up and down, and the operating rod 14 is reset upward by the reset spring 13 to retract the telescopic rod 10, so as to avoid affecting the installation and disassembly of the sand core 22, which is convenient for use. When the operating rod 14 is pressed down, the locking part 1 and the locking part 2 cooperate to lock the operating rod 14, so that the supporting plate 11 on the telescopic rod 10 provides a stable supporting force for the sand core 22, thereby ensuring safe and stable lifting.

[0033] When the operating rod 14 is pressed down and the operating rod 14 contacts the annular frame 5, it is the extreme position of the extension. At this time, the hook on the operating rod 14 is just allowed to pass over the positioning pin, and the position of the support plate 11 will not damage the sand core 22. When the operating rod 14 is released, the telescopic rod 10 retracts inward, and the end face of the support plate 11 contacts the guide sleeve 12. At this time, it is the extreme position of retraction. The maximum horizontal stroke of the support plate 11 is 80mm, and the actual effective stroke is 70mm. The telescopic rod 10 of this sling has a long movement stroke. After the telescopic rod 10 is reset and retracted, the diameter of the circumscribed circle of the protruding position of the support plate 11 is 40mm smaller than the inner circle diameter of the sand core 22. The margin of movement during the alignment process is large, and it is easier to align the center of the sand core 22 and put it down. The diameter of the center column 1 is small, and the blind spot of the field of vision is small during the alignment process. The distance between the center column 1 and the inner circle of the sand core 22 can be clearly observed, and the position of the sling can be easily judged. The movable ring 8 and the connecting rod, the connecting rod and the telescopic rod 10, the operating rod 14 and the ear on the central column 1, and the operating rod 14 connecting rod and the ear on the central ring are all connected by a rotating shaft. The telescopic rod 10 and the guide sleeve 12 are lubricated with a nylon sleeve 21. The overall movement is smooth, the movement trajectory is clear, it is wear-resistant, and the assembly accuracy is high.

[0034] The hoisting part includes a hoisting ring 2, the fixed bracket includes a plurality of transverse connecting rods 6, and the reinforcing rod is an inclined rod 3. By means of a telescopic connecting rod, the sand core 22 can be easily grasped and taken out from the core box, which is convenient for subsequent transportation, and solves the problems that the sand core 22 for large-diameter ductile iron pipes is difficult to hoist, the hoisting device is difficult to align the position during the hoisting of the sand core 22, the sand core 22 is not firmly fixed and is easy to slip, and the labor intensity of the operator is high, and the overall structure is lightweight.

[0035] The center column 1 is connected to the annular frame 5 through four square transverse connecting rods 6, and the lifting ring 2 is welded to the center column 1. One end of the diagonal rod 3 is connected to the center column 1, and the other end is connected to the pressing plate 4. The annular frame 5 is made of bent channel steel. The supporting feet 7 are cut square tubes, vertically welded to the lower surface of the annular frame 5, and evenly distributed along the annular frame 5, a total of four, and the above components are welded together as the main structure of the entire device.

[0036] The main moving and functional parts of the sling include a movable ring 8 mounted on the central column 1, which can move up and down, and four ear plates for rotational connection are welded on the circumference. The two ends of the connecting rod 9 are respectively hinged by rotation, one end is connected to the movable ring 8, and the other end is connected to the telescopic rod 10. The distance between the two connecting holes is 300mm, and the effective movable angle is 20 degrees 45 degrees. One end of the telescopic rod 10 is hinged to the connecting rod 9, and the other end is connected to the supporting plate 11 through the connecting part 112. The supporting plate 11 is used to expand the force-bearing area and is covered with rubber. The guide sleeve 12 is welded on the annular skeleton 5. The main body of the guide sleeve 12 is processed by drilling and reaming of square steel. The end surface position is processed with a groove by a broach for embedding the inner retaining ring 20. A nylon sleeve 21 is placed between the step and the retaining ring 20, and the nylon sleeve 21 plays a self-lubricating role. The reset spring 13 is sleeved on the center column 1. When the sand core 22 needs to be put down, the elastic force of the reset spring 13 makes the movable ring 8 move upward, thereby driving the lower operating rod 14 to reset easily. The upper end of the operating rod 14 is connected to the hanging ear welded on the center column 1 through a sliding sleeve, and the middle is connected to the hanging ear welded on the center ring through the connecting rod of the operating rod 14. The handle part can move up and down, and when pressed down to a preset position, the movable hook body 16 hooks the fixed pin 17 welded on the transverse connecting rod 6 to achieve locking.

[0037] Furthermore, a plurality of pressing plates 4 for cooperating with the sand core 22 are arranged on the annular skeleton 5 , a reinforcing rod is arranged between the pressing plates 4 and the central column 1 , and a plurality of supporting feet 7 are arranged at the bottom of the annular skeleton 5 .

[0038] The pressure plate 4 is used to cooperate with the support plate 11 to limit the position of the sand core 22, limit the movement of the sand core 22 during the lifting process, ensure the lifting stability, and set the reinforcing rod to improve the stability of the connection of the pressure plate 4. The support foot 7 is used to place the lifting device on the ground when it is not in use to prevent the functional parts from contacting with the ground and being damaged.

[0039] The pressing plate 4 is used for cooperating with the sand core 22 for positioning, and the supporting plate 11 is used for cooperating with the bottom surface of the sand core 22 for positioning.

[0040] Furthermore, the supporting plate 11 includes a flat plate 111 , and a connecting portion 112 for connecting with the telescopic rod 10 is disposed at the bottom of the flat plate 111 .

[0041] The flat plate 111 structure is convenient for supporting the sand core 22 , and is connected and fixed to the telescopic rod 10 via the connecting portion 112 .

[0042] The connecting portion 112 is provided with a mounting groove for connecting the telescopic rod 10 , and the connecting portion 112 is mounted on the bottom surface of the flat plate 111 by screws, so that the connecting portion 112 and the telescopic rod 10 are pressed and fixed.

[0043] Furthermore, the first locking part includes a movable hook body 16 disposed on the operating rod 14 , and the second locking part includes a fixing pin 17 for cooperating with the movable hook body 16 .

[0044] The operating rod 14 is positioned by the cooperation of the movable hook body 16 and the fixing pin 17 to prevent the telescopic rod 10 from retracting during hoisting.

[0045] In the embodiment, the movable hook body 16 includes a sliding sleeve, which can be slidably fitted on the outer ring of the operating rod 14. When unlocking is required, the operating rod 14 is pressed down and the movable hook body 16 is slidable. The movable hook body 16 and the operating rod 14 can also be rotatably connected.

[0046] Furthermore, the top end of the return spring 13 is connected to the movable ring 8, and the bottom end of the return spring 13 is connected to the fixed bracket.

[0047] By connecting and positioning the two ends of the return spring 13 to the movable ring 8 and the fixed bracket respectively, the structure is simple and easy to use.

[0048] The two ends of the return spring 13 can be fixedly connected to the movable ring 8 and the fixed bracket or can be connected in a fitting manner.

[0049] The method of use is as follows: Use an electric hoist / single-beam crane to lift the sling through the ring 2 on the center column 1 and move it to the top of the sand core 22. During the descent, the operator uses the operating rod 14 to move the sling in a small range to align it with the center of the sand core 22, and continue to descend. The pressure plate 4 presses on the flange surface at the top of the sand core 22; press the operating rod 14, and the connecting rod of the operating rod 14 rotates accordingly, driving the movable ring 8 to move downward. The connecting rod expands outward and drives the telescopic rod 10 to extend outward. Continue to press down, so that the movable hook body 16 near the handle of the operating rod 14 reaches the position of the fixed pin 17, moves slightly horizontally, and hooks the fixed pin 17. The supporting plate 11 connected to the telescopic rod 10 moves to the preset position and extends under the step surface of the sand core 22. At this time, the special sling is stably connected to the sand to form a combination. Use an electric hoist or single-beam crane to lift the sand core 22 through the ring 2 on the center column 1 and enter the next process.

[0050] When the connection between the sand core 22 and the sling needs to be released, the movable hook body 16 is slightly moved downward and laterally, and the reset spring 13 resets and drives the operating rod 14 to move upward and automatically return to the initial position. At this time, the movable ring 8 slides up, and the telescopic rod 10 and the supporting plate 11 on the telescopic rod 10 retract inward through the connecting rod, and the lock can be released.

[0051] Example 2

[0052] like Figure 5 As shown, a ductile iron pipe sand core hanger in this embodiment is further modified as follows on the basis of embodiment 1:

[0053] Furthermore, the support plate 11 is connected to a support rod 18 , and a plurality of guide sleeves 19 are provided on the annular frame 5 , and the support rod 18 is slidably connected to the guide sleeves 19 .

[0054] The guide sleeve 19 and the support rod 18 are slidably matched to provide support force to the support plate 11 , thereby ensuring the support effect on the sand core 22 .

[0055] Two support rods 18 are disposed at the bottom of each supporting plate 11 , and the support rods 18 are located on both sides of the telescopic rod 10 .

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ductile iron pipe sand core hanger, characterized in that: The invention comprises a center column, the top of which is provided with a lifting part, the center column is connected with a fixed bracket, the fixed bracket is connected with an annular frame located at the outer circle of the center column, a plurality of guide sleeves are provided at the bottom of the annular frame, a telescopic rod is slidably provided in the guide sleeve, a supporting plate is provided at the outer end of the telescopic rod, a connecting rod is rotatably connected with a connecting rod at the inner end of the telescopic rod, a movable ring is slidably provided on the center column, the connecting rod is rotatably connected with the movable ring, a reset spring for connecting the movable ring is provided on the center column, the movable ring is rotatably connected with a connecting rod two, an operating rod is rotatably provided on the center column, the operating rod is rotatably connected with the connecting rod two, a locking part one is provided on the operating rod, and a locking part two for cooperating with the locking part one is provided on the fixed bracket.

2. The ductile iron pipe sand core hanger according to claim 1, characterized in that: The annular frame is provided with a plurality of pressing plates for cooperating with the sand core, a reinforcing rod is provided between the pressing plates and the central column, and a plurality of supporting feet are provided at the bottom of the annular frame.

3. The ductile iron pipe sand core hanger according to claim 1, characterized in that: The supporting plate comprises a flat plate, and a connecting portion for connecting with a telescopic rod is arranged at the bottom of the flat plate.

4. The ductile iron pipe sand core hanger according to claim 1, characterized in that: The first locking part comprises a movable hook body arranged on the operating rod, and the second locking part comprises a fixing pin used for cooperating with the movable hook body.

5. The ductile iron pipe sand core hanger according to claim 1, characterized in that: The supporting plate is connected with a supporting rod, and a plurality of guide sleeves 2 are arranged on the annular frame, and the supporting rod is slidably connected with the guide sleeves 2.

6. The ductile iron pipe sand core hanger according to claim 1, characterized in that: The top end of the return spring is connected to the movable ring, and the bottom end of the return spring is connected to the fixed bracket.

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