Casting mold for medium pressure resin busbar expansion joint

Abstract

The medium-pressure resin busbar expansion joint casting mold of the present invention, after the busbar of the lower part of the resin busbar expansion joint passes through the lower stripper plate slot at the bottom of the casting mold cavity, the busbar extension length and the busbar phase spacing are limited and fixed by the soft connection positioning mechanism on the top of the steel mold sleeve and the busbar positioning mechanism below, and then the resin is cast. After the resin casting of the lower half is completed, the lower stripper plate is pushed downward along the two warming screws by the double nuts to move and demould. After the resin busbar expansion joint is lifted and turned over by the demoulding crane, the lower stripper plate is reset and the above process is repeated to meet the vertical casting requirements of the expansion joint and ensure the surface quality of all mounting surfaces after demoulding and the positioning dimensional accuracy of the inserts; the end of one side of the resin busbar expansion joint can be suspended and fixed by the ratchet wire hook to overcome the problem that the soft connection part cannot bear the load when the other side is cast. The structure is simple, the positioning operation is convenient, the positioning accuracy is high, the casting quality is stable, and the safety factor is high.

Description

Technical Field

[0001] The invention relates to a casting mould for a medium-pressure resin busbar expansion joint. Background Art

[0002] In the busbar system of power transmission and distribution products in the power industry, expansion joint busbars must be configured within the specified distance to adapt to the position error in the project installation and alleviate the dimensional changes caused by thermal expansion during system operation; the expansion joint of the medium-voltage resin busbar is generally composed of a cast body at both ends and a soft connection in the middle, which is large and bulky. The two cast bodies need to be cast and formed separately, and it is difficult to install and connect after casting; the soft connection part of the resin busbar expansion joint cannot bear weight. During the casting process, the busbars at both ends of the resin busbar expansion joint need to be kept in a vertical position. At the same time, the soft connection part must be tightened to keep it in a vertical state to prevent high temperature from damaging the insulation layer of the soft connection part. The positioning operation is inconvenient, the positioning accuracy is not high, the casting quality is unstable, and there are safety hazards. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a casting mould for a medium-pressure resin busbar expansion joint which has stable casting quality, high position accuracy, simple structure and convenient operation.

[0004] The medium-pressure resin busbar expansion joint casting mold of the present invention is characterized in that: it includes a gantry, a casting mold is fixedly arranged at the lower part of the gantry, the casting mold includes a casting mold cavity surrounded by a steel mold sleeve and a lower stripping plate, and the lower stripping plate is provided with a slot hole capable of allowing the lower end of the phase busbar of the lower half of the resin busbar expansion joint to extend out; the steel mold sleeve is fixedly supported and connected to the gantry by a fixed support frame on the outside, a soft connection positioning mechanism capable of limiting the support of the lower end of the soft connection part of the resin busbar expansion joint according to the phase spacing requirement is provided on the top of the steel mold sleeve, and a busbar positioning mechanism capable of limiting the support of the phase busbar of the lower half of the resin busbar expansion joint according to the phase spacing and the busbar extension length requirements is installed below the casting mold; a suspension mechanism capable of suspending and fixing the upper half of the resin busbar expansion joint is provided below the top of the gantry, and a demoulding crane capable of lifting the resin busbar expansion joint after casting for demoulding is installed above the top of the gantry;

[0005] The steel mold sleeve is a T-shaped structure, and the outer ends of a pair of symmetrically arranged fixed support frames are respectively fixedly connected to the inner sides of the gantry columns on both sides, and the inner ends of the fixed support frames cooperate with the T-shaped structure to limit and support the steel mold sleeve;

[0006] The pair of fixed support frames are respectively fixedly connected with screw rods extending vertically downward, and the two ends of the lower stripping plate are respectively connected to the screw rods through upper and lower double nuts;

[0007] The busbar positioning mechanism includes a busbar positioning plate fixedly connected to the lower end of the screw rod, and a busbar positioning rod fixedly arranged above the busbar positioning plate, and both ends of the busbar positioning rod are fixedly supported above the busbar positioning plate through fulcrums;

[0008] The upper surface of the busbar positioning plate is provided with limited grooves at positions corresponding to the ends of each phase busbar of the resin busbar expansion joint;

[0009] The suspension mechanism includes a main pulley and a main steel wire rope installed in the middle of the gantry top frame, a copper bar hanging wheel is installed on the upper part of the outer side surface of one side column of the gantry, one end of the main steel wire rope is tensioned and pulled by the copper bar hanging wheel, and the other end passes through the main pulley and is connected to the main hook, and the main hook is hooked in a lifting ring in the middle part above a horizontal hanging plate, and a plurality of vertical clamping plates are arranged below the horizontal hanging plate, and each vertical clamping plate can be fixedly connected with the connection hole of the busbar end of the resin busbar expansion joint;

[0010] Each vertical clamping plate comprises a pair of L-shaped plates, which are arranged back to back and fixedly connected to the horizontal hanging plate through the short sides, and the distance between the long sides of the pair of L-shaped plates is adapted to the thickness of the busbar of the resin busbar expansion joint;

[0011] The suspension mechanism also includes a pair of auxiliary pulleys and auxiliary steel wire ropes. The pair of auxiliary pulleys are symmetrically installed on the top frame of the gantry at positions on both sides of the main pulley. The lower parts of the outer sides of the columns on both sides of the gantry are respectively installed with left pulleys and right pulleys. One end of the auxiliary steel wire rope of the pair of auxiliary pulleys is tensioned and pulled by the left pulley and the right pulley respectively, and the other end is connected to the auxiliary hook after passing through the auxiliary pulleys. After the resin block of the lower half of the resin busbar expansion joint is cast and lifted and turned over by the draft crane, the auxiliary hook can assist in suspending the resin block.

[0012] A transition pulley is arranged above the corresponding ends of the gantry top frame and the copper bar hanging wheel, and the main steel wire rope is tensioned and pulled from the copper bar hanging wheel through the transition pulley and connected to the main pulley; the main hook and the auxiliary hook are both ratchet wire hooks;

[0013] The soft connection positioning mechanism includes multiple pairs of clamps corresponding to the soft connection positions of each phase resin busbar expansion joint, one of the clamps in each pair of clamps is a fixed clamp, and the other clamp is a movable clamp, one end of the movable clamp is hingedly connected to the fixed clamp, and the other end is a free end and can be locked by a lock on the fixed clamp.

[0014] The medium-pressure resin busbar expansion joint casting mold of the present invention has a busbar at the lower part of the resin busbar expansion joint that passes through the slot hole of the lower stripper plate at the bottom of the casting mold cavity and is limited and fixed by the busbar positioning mechanism, accurately positioning the extension length of the busbar and the phase spacing of the busbar, and limiting and fixing the soft connection part by the soft connection positioning mechanism at the top of the steel mold sleeve, while controlling the phase spacing position of the busbar in the casting mold cavity, and then casting the resin. After the resin casting of the lower part of the resin busbar expansion joint is completed, the double nuts are used to push the lower stripper plate to move downward along the two warming screws for demoulding, and the resin busbar expansion joint is lifted and flipped by the demoulding crane. Finally, the lower stripper plate is reset, the busbar and soft connection are repeatedly limited and fixed, and the other half of the resin is poured to complete the pouring of the two resin blocks of the resin busbar expansion joint, which meets the vertical pouring requirements of the expansion joint and guarantees the surface quality of all mounting surfaces after demoulding and the positioning size accuracy of the inserts to the maximum extent; the end of one side of the resin busbar expansion joint can be suspended and fixed by the ratchet wire hook to overcome the problem that the soft connection part cannot bear the weight when pouring the other side. After the pouring is completed, the demoulding crane is used to lift the whole part out of the mold; the structure is simple, the positioning operation is convenient, the positioning accuracy is high, the pouring quality is stable, and the safety factor is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a schematic structural diagram of the lower half of the resin busbar expansion joint casting mold when casting the resin busbar expansion joint in an embodiment of the present invention;

[0016] Figure 2 yes Figure 1 A magnified schematic diagram of the local structure;

[0017] Figure 3 It is a structural schematic diagram of the mold for casting a resin busbar expansion joint in an embodiment of the present invention when the lower half of the resin busbar expansion joint is cast and turned over to continue casting the other half. DETAILED DESCRIPTION

[0018] As shown in the figure, a medium-pressure resin busbar expansion joint casting mold, the overall planning scheme is:

[0019] First, a gantry is selected as the basic support structure, and a casting mold is fixedly set at the lower part of the gantry 3. The casting mold is first surrounded by a steel mold sleeve 11 and a lower stripper plate 12 to form a casting mold cavity. A plurality of slots are set on the lower stripper plate 12, and the number and size of the slots correspond to the number and size of the busbars 14 of the resin busbar expansion joint, so that the lower end of the phase busbar 14 in the lower half of the resin busbar expansion joint can extend downward along the slots; the outside of the steel mold sleeve 11 is fixedly supported and connected to the inside of the gantry 3 by a fixed support frame, and the support is stable, which is convenient for positioning, casting and other operations; a soft connection positioning mechanism 8 is set at the top of the steel mold sleeve 11 according to the phase spacing requirements, and the lower end of the soft connection part 7 of the resin busbar expansion joint is limited and supported by the soft connection positioning mechanism 8 according to the phase spacing requirements. A busbar positioning mechanism is installed below the casting mold. The busbar positioning mechanism is used to limit and support the phase busbar 14 of the lower part of the resin busbar expansion joint according to the phase spacing and the busbar extension length requirements. There will be no displacement deviation during the casting process, and the casting quality is stable. A suspension mechanism is set below the top of the gantry 3. The upper part of the resin busbar expansion joint is suspended and fixed by the suspension mechanism to overcome the problem that the soft connection part cannot bear the load when the resin block on the other side is cast, so that the soft connection part is also kept in a vertical state to prevent the insulation layer of the soft connection part from being affected by the casting temperature and deformed or even damaged, thereby ensuring product quality and improving efficiency. Finally, a demoulding crane is installed above the top of the gantry 3, and the resin busbar expansion joint after casting is lifted by the demoulding crane for demoulding.

[0020] Specifically:

[0021] The steel mold sleeve 11 adopts a T-shaped structure to adapt to the T-shaped structure formed by the total width of the cast body at the connection between the soft connection part of the resin busbar expansion joint and the phase busbar being greater than the total width of the cast body of the phase busbar, and the corresponding internal cavity is set according to the external structure requirements of the insulator of each phase busbar; the T-shaped structure of the steel mold sleeve 11 also has the function of limiting steps; the fixed support frame outside the steel mold sleeve 11 is a pair of symmetrically arranged fixed support frames 9, the outer ends of the pair of fixed support frames 9 are respectively fixedly connected to the inner side surfaces of the columns on both sides of the gantry 3, and the inner ends of the fixed support frames cooperate with the T-shaped structure to limit and support the steel mold sleeve 11, with high support strength and stable structure;

[0022] A screw rod 18 extending downward in the vertical direction is fixedly connected to the lower side of a pair of fixed support frames 9, and the two ends of the lower stripping plate 12 are respectively connected to the screw rod 18 through a double nut structure composed of an upper nut 17 and a lower nut 16; after the resin pouring of the lower half of the resin busbar expansion joint is completed, the double nuts are used to push the lower stripping plate to move downward along the two warming screws for demoulding. After the resin busbar expansion joint is lifted and turned over by the demoulding crane, the double nuts are used to push the lower stripping plate to reset, and the busbar and the soft connection are repeatedly fixed, and the other half of the resin is continued to be poured to complete the pouring of the two resin blocks of the resin busbar expansion joint.

[0023] A transverse busbar positioning plate 15 is fixedly connected to the lower end of the screw 18, and a transverse busbar positioning rod 13 is fixedly arranged above the busbar positioning plate. The two ends of the busbar positioning rod 13 are respectively fixedly supported above the busbar positioning plate 15 through a fulcrum; the busbar positioning rod 13 can be arranged at a position on one side above the busbar positioning plate 15, and the busbars of each phase line of the resin busbar expansion joint can be aligned from the outside, or the connecting holes on each phase line busbar of the resin busbar expansion joint can be sequentially passed through and then fixedly supported at both ends through a fulcrum. The latter operation method is more complicated;

[0024] Limiting grooves are respectively arranged on the upper surface of the busbar positioning plate 15 at positions corresponding to the ends of each phase busbar 14 of the resin busbar expansion joint. After the lower ends of the phase busbars 14 in the lower half of the resin busbar expansion joint of each phase busbar 14 extend downward along the slot, they extend into the limiting grooves. The limiting grooves and the busbar positioning rods are combined to form a busbar positioning mechanism, and at the same time, each phase busbar 14 is positioned and fixed in the vertical, horizontal and longitudinal directions;

[0025] The suspension mechanism includes a main pulley 27 and a main steel wire rope 23 installed in the middle of the top frame of the gantry hanger. A copper bar hanging wheel 5 is installed on the upper part of the outer side of the column on one side of the gantry 3. One end of the main steel wire rope 23 is tensioned and pulled by the copper bar hanging wheel 5, and the other end is connected to a main hook by passing through the main pulley 27. The main hook is hooked in a lifting ring 22 in the middle part above a horizontal hanging plate 4. The uncast upper half of the resin bus expansion joint, or the cast and turned upper half after the casting is completed, is suspended and fixed by the main hook and the lifting ring 22. The specific connection structure with the resin bus expansion joint is that a plurality of vertical clamping plates 21 are arranged below the horizontal hanging plate 4, and each vertical clamping plate 21 is respectively fixedly connected with the connection hole at the end of the phase busbar of the resin bus expansion joint, so as to suspend and fix the upper half of the resin bus expansion joint, overcome the problem that the soft connection part cannot bear the load when the resin block on the other side is cast, and at the same time, the soft connection part is also kept in a vertical state;

[0026] Furthermore, each vertical clamping plate 21 includes a pair of L-shaped plates, which are arranged back to back and fixedly connected to the bottom surface of the horizontal hanging plate 4 through the short sides, respectively. The distance between the long sides of the pair of L-shaped plates is adapted to the thickness of the phase busbar of the resin busbar expansion joint. The pair of L-shaped plates cooperate to clamp the end of the phase busbar of the resin busbar expansion joint, and can be fixedly connected to the connection hole of the end of the phase busbar through bolts, which is stable and reliable.

[0027] Furthermore, since the resin block 6 of the lower part of the resin busbar expansion joint is heavier after being cast, a pair of auxiliary pulleys 26 and auxiliary steel wire ropes 24 are also provided for the suspension mechanism. The pair of auxiliary pulleys 26 are symmetrically installed on the top frame of the gantry 3 at the positions on both sides of the main pulley 27. The left pulley 19 and the right pulley 10 are respectively installed at the lower parts of the outer side surfaces of the columns on both sides of the gantry 3. One end of the auxiliary steel wire rope 24 of the pair of auxiliary pulleys 26 is tensioned and pulled by the left pulley 19 and the right pulley 10, respectively, and the other end is connected to an auxiliary hook 20 after passing through the pair of auxiliary pulleys 24. After the resin block 6 of the lower part of the resin busbar expansion joint is cast and lifted and turned over by the draft crane, a fixed lifting ring structure is also respectively provided at both ends of the T-shaped structure of the resin block 6. The resin block is suspending auxiliaryly by cooperating with the auxiliary hook and the fixed lifting ring, thereby improving the suspension reliability.

[0028] The soft connection positioning mechanism 8 is provided with a pair of clamps fixedly installed on the top of the steel mold sleeve corresponding to the position of each phase soft connection of the resin busbar expansion joint. One of the clamps in each pair of clamps is set as a fixed clamp and the other clamp is set as a movable clamp. One end of the movable clamp is hingedly connected to the fixed clamp. After the phase busbar of the lower half of the resin busbar expansion joint passes through the casting mold cavity and is fixed in position, the soft connection of each phase is tightly attached to the fixed clamp of each pair of clamps, and the free end of the movable clamp is rotated so that the movable clamp cooperates with the fixed clamp to clamp the soft connection, and then the lock on the fixed clamp locks the movable clamp, which is easy to operate.

[0029] The medium-pressure resin busbar expansion joint casting mold of the present invention has a busbar at the lower part of the resin busbar expansion joint that passes through the slot hole of the lower stripper plate at the bottom of the casting mold cavity and is limited and fixed by the busbar positioning mechanism, accurately positioning the extension length of the busbar and the phase spacing of the busbar, and limiting and fixing the soft connection part by the soft connection positioning mechanism at the top of the steel mold sleeve, while controlling the phase spacing position of the busbar in the casting mold cavity, and then casting the resin. After the resin casting of the lower part of the resin busbar expansion joint is completed, the double nuts are used to push the lower stripper plate to move downward along the two warming screws for demoulding, and the resin busbar expansion joint is lifted and flipped by the demoulding crane. Finally, the lower stripper plate is reset, the busbar and soft connection are repeatedly limited and fixed, and the other half of the resin is poured to complete the pouring of the two resin blocks of the resin busbar expansion joint, which meets the vertical pouring requirements of the expansion joint and guarantees the surface quality of all mounting surfaces after demoulding and the positioning size accuracy of the inserts to the maximum extent; the end of one side of the resin busbar expansion joint can be suspended and fixed by the ratchet wire hook to overcome the problem that the soft connection part cannot bear the weight when pouring the other side. After the pouring is completed, the demoulding crane is used to lift the whole part out of the mold; the structure is simple, the positioning operation is convenient, the positioning accuracy is high, the pouring quality is stable, and the safety factor is high.

[0030] Features:

[0031] 1. The invented medium-pressure resin busbar expansion joint casting mold has an overall structure that meets the vertical casting requirements of the expansion joint, and maximizes the surface quality of all mounting surfaces after demoulding and the positioning dimensional accuracy of the inserts.

[0032] 2. The ratchet wire hook mechanism can fix one end, overcoming the problem that the soft connection part cannot be weighed when pouring the other side.

[0033] 3. The busbar positioning plate and positioning rod are designed at the bottom of the mold frame, which can accurately locate the extension length of the busbar and the phase spacing of the busbar.

[0034] 4. Three sets of soft connection positioning plates are also designed above the casting steel mold to control the phase spacing position of the busbar in the mold cavity.

[0035] 5. Two 1-ton electric cranes are installed on the top of the mold frame, which can facilitate the product to be directly pulled out of the mold cavity through the hook and the lower stripper plate after the resin product is completely cured.

Claims

1. A medium-pressure resin busbar expansion joint casting mold, characterized in that: The utility model comprises a gantry, a casting mold is fixedly arranged at the lower part of the gantry, the casting mold comprises a casting mold cavity surrounded by a steel mold sleeve and a lower stripper plate, the lower stripper plate is provided with a slot hole for allowing the lower end of the phase busbar of the lower half of the resin busbar expansion joint to extend out; the outer part of the steel mold sleeve is fixedly supported and connected to the gantry by a fixed support frame, the top of the steel mold sleeve is provided with a soft connection positioning mechanism which can limit the lower end of the soft connection part of the resin busbar expansion joint according to the phase spacing requirement, and a busbar positioning mechanism which can limit the lower part of the phase busbar of the resin busbar expansion joint according to the phase spacing and the busbar extension length requirement is installed below the casting mold; a suspension mechanism which can suspend and fix the upper part of the resin busbar expansion joint is arranged below the top of the gantry, and a demoulding crane which can lift the resin busbar expansion joint after casting for demoulding is installed above the top of the gantry.

2. The casting mold for medium-pressure resin busbar expansion joint according to claim 1, characterized in that: The steel mold sleeve is a T-shaped structure, and the outer ends of a pair of symmetrically arranged fixed support frames are respectively fixedly connected to the inner sides of the gantry columns on both sides, and the inner ends of the fixed support frames cooperate with the T-shaped structure to limit and support the steel mold sleeve.

3. The casting mold for medium-pressure resin busbar expansion joint according to claim 2 is characterized in that: The pair of fixed support frames are respectively fixedly connected with screw rods extending vertically downwards below, and the two ends of the lower stripping plate are respectively connected to the screw rods through upper and lower double nuts.

4. The casting mold for medium-pressure resin busbar expansion joint according to claim 3 is characterized in that: The busbar positioning mechanism includes a busbar positioning plate fixedly connected to the lower end of the screw rod, and a busbar positioning rod fixedly arranged above the busbar positioning plate, and both ends of the busbar positioning rod are fixedly supported above the busbar positioning plate through fulcrums.

5. The casting mold for medium-pressure resin busbar expansion joint according to claim 4, characterized in that: The upper surface of the busbar positioning plate is provided with limiting grooves at positions corresponding to the ends of each phase busbar of the resin busbar expansion joint.

6. The casting mold for medium-pressure resin busbar expansion joint according to any one of claims 1 to 5, characterized in that: The suspension mechanism includes a main pulley and a main steel wire rope installed in the middle of the gantry top frame, a copper bar hanging wheel is installed on the upper outer surface of one side column of the gantry, one end of the main steel wire rope is tensioned and pulled by the copper bar hanging wheel, and the other end passes around the main pulley and is connected to the main hook, and the main hook is hooked in a hanging ring in the middle part above a horizontal hanging plate, and a plurality of vertical clamps are arranged under the horizontal hanging plate, and each vertical clamp can be fixedly connected with the connecting hole at the end of the busbar of the resin busbar expansion joint.

7. The casting mold for medium-pressure resin busbar expansion joint according to claim 6, characterized in that: Each vertical clamping plate includes a pair of L-shaped plates, which are arranged back to back and fixedly connected to the horizontal hanging plate through the short sides. The distance between the long sides of the pair of L-shaped plates is adapted to the thickness of the busbar of the resin busbar expansion joint.

8. The casting mold for medium-pressure resin busbar expansion joint according to claim 7, characterized in that: The suspension mechanism also includes a pair of auxiliary pulleys and auxiliary steel wire ropes. The pair of auxiliary pulleys are symmetrically installed on the top frame of the gantry at positions on both sides of the main pulley. The lower parts of the outer sides of the columns on both sides of the gantry are respectively installed with left pulleys and right pulleys. One end of the auxiliary steel wire rope of the pair of auxiliary pulleys is tensioned and pulled by the left pulley and the right pulley respectively, and the other end is connected to the auxiliary hook after passing through the auxiliary pulleys. After the resin block of the lower part of the resin busbar expansion joint is cast and lifted and turned over by the draft crane, the auxiliary hook can assist in suspending the resin block.

9. The casting mold for medium-pressure resin busbar expansion joint according to claim 7 or 8, characterized in that: A transition pulley is arranged above the corresponding ends of the gantry top frame and the copper bar hanging wheel, and the main steel wire rope is tensioned and pulled from the copper bar hanging wheel through the transition pulley and connected to the main pulley; the main hook and the auxiliary hook are both ratchet wire hooks.

10. The casting mold for medium-pressure resin busbar expansion joint according to claim 9, characterized in that: The soft connection positioning mechanism includes multiple pairs of clamps corresponding to the soft connection positions of each phase resin busbar expansion joint, one of the clamps in each pair of clamps is a fixed clamp, and the other clamp is a movable clamp, one end of the movable clamp is hingedly connected to the fixed clamp, and the other end is a free end and can be locked by a lock on the fixed clamp.

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