Forming Die and Forming Method for Composite Prefabricated Fragments

Abstract

The present invention discloses a forming mold and a forming method for a combined prefabricated fragment, relating to the technical field of forming molds, which includes an outer shell, an inner shell, a top cover, a base and auxiliary components. The outer shell is coaxially sleeved on the outer periphery of the inner shell, and a filling gap is formed between the outer shell and the inner shell. The base is connected to the lower ends of the outer shell and the inner shell, and the top cover is connected to the upper ends of the outer shell and the inner shell. Moreover, the top cover and the base can respectively seal the upper and lower ends of the filling gap. The filling gap is used for filling fragments. A glue injection hole is provided on the side wall of the outer shell. When injecting glue into the filling gap through the glue injection hole, the fragments in the filling gap can be bonded to form fragment units. The auxiliary components are used to assist in layer-by-layer filling of fragments into the filling gap and enable a plurality of fragment units to be formed in sequence to manufacture a combined prefabricated fragment. The present invention can realize the production of a multi-layer glue injection module, and has a simple overall structure and is convenient to use.

Description

Technical Field

[0001] The present invention relates to the technical field of forming molds, and particularly to a forming mold and a forming method for combined prefabricated fragments. Background Art

[0002] Tungsten alloy prefabricated fragments are generally used in ammunitions such as landmines and grenades and are components for killing living forces.

[0003] In the application of prefabricated fragments for large ammunitions, more and more spherical fully prefabricated fragments made of tungsten alloy (or other materials) are processed, and then cast into modules with special silicone rubber in a mold, and a design scheme of pasting the modules on the shell with special glue is adopted. The existing design scheme tends to use single-specification fragments, and its advantage is easy design and mass production. However, the single-specification fragments also have disadvantages, that is, there are design limitations.

[0004] In recent years, in order to pursue the maximum damage effect, the arrangement of fragments has shown more and more trends such as the mixed arrangement of large fragments and small fragments, and the layered arrangement of fragments of different sizes. In order to maximize the elimination of fragment gaps and more efficiently utilize the detonation energy, the traditional process method is: making each single-specification fragment into a module separately, and then pasting each module in the corresponding position in sequence. The advantage of this process is that the mold making is simple and the operation is convenient. However, the disadvantages are also obvious, that is, during the pasting process of the modules, as the glue is applied and pasted layer by layer, the overall thickness of the modules gradually becomes uncontrollable, and as the number of pasting times increases, the risk of degumming gradually increases, directly affecting the assembly of the charge or other subsequent components. Summary of the Invention

[0005] The purpose of the present invention is to provide a forming mold and a forming method for combined prefabricated fragments to solve the problems existing in the above-mentioned prior art, and to realize the production of multi-layer injection molding modules, and the overall structure is simple and easy to use.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] The present invention provides a forming mold for a combined prefabricated fragment, which includes an outer shell, an inner shell, a top cover, a base, and auxiliary components. The outer shell is coaxially sleeved on the outer periphery of the inner shell, and a filling gap is formed between the outer shell and the inner shell. The base is connected to the lower ends of the outer shell and the inner shell, and the top cover is connected to the upper ends of the outer shell and the inner shell. The top cover and the base can respectively seal the upper and lower ends of the filling gap. The filling gap is used to fill fragments. A glue injection hole is formed in the side wall of the outer shell. When injecting glue into the filling gap through the glue injection hole, the fragments in the filling gap can be bonded to form fragment units. The auxiliary components are used to assist in layer-by-layer filling of the fragments into the filling gap and to sequentially form a plurality of fragment units to make a combined prefabricated fragment.

[0008] Preferably, the outer shell is a hollow cylinder, and the hollow cylinder is formed by buckling two semi-circular cylinder bodies. The two semi-circular cylinder bodies can be detachably connected.

[0009] Preferably, a stepped protrusion is provided at the upper end of the base, and a stepped surface is provided at the lower end of the outer shell. The outer shell is located at the upper end of the base, and the stepped surface is in contact with the stepped protrusion in a matching manner. The inner shell is located at the upper end of the stepped protrusion.

[0010] Preferably, two partition plates are symmetrically arranged in the filling gap. The two partition plates are respectively located at the two buckling positions of the outer shell, and the partition plates are connected between the two semi-circular cylinder bodies. One side of each partition plate extends to the outer wall of the inner shell, and the other side of each partition plate is connected to the two semi-circular cylinder bodies. An avoidance groove is provided at the position of the partition plate corresponding to the stepped protrusion.

[0011] Preferably, two limiting plates are also symmetrically arranged in the filling gap. The two limiting plates and the two partition plates are arranged in a circular and uniform manner in the filling gap, and the limiting plates and the partition plates are arranged alternately. Two outer clamping grooves are symmetrically arranged at the upper end of the inner wall of the outer shell, two inner clamping grooves are symmetrically arranged at the upper end of the outer wall of the inner shell, and two lower clamping grooves are symmetrically arranged on the outer ring of the stepped protrusion. The two limiting plates, the two outer clamping grooves, the two inner clamping grooves, and the two lower clamping grooves correspond to each other one by one. The limiting plates support in the filling gap, and one side of the upper end of the limiting plate is limited and connected in the outer clamping groove, the other side of the upper end of the limiting plate is limited and connected in the outer clamping groove, and the lower end of the limiting plate is limited and connected in the lower clamping groove; the limiting plate is T-shaped, and both sides of the large end of the limiting plate are respectively used for limiting connection with the outer clamping groove and the inner clamping groove.

[0012] Preferably, when the combined preformed fragments include multiple layers of fragment units sleeved inside and outside in sequence, the auxiliary element includes a plurality of spacer ring plates, and each of the spacer ring plates is coaxially sleeved in the filling gap. The space between the inner wall of the innermost spacer ring plate and the outer wall of the inner housing is used to form the innermost layer of fragment units, the position where the outermost spacer ring plate is located is used to form the outermost layer of fragment units, and the positions where each of the spacer ring plates is located are respectively used to form one layer of fragment units. Each of the spacer ring plates is provided with glue passing holes, and the glue liquid entering the outer housing through the glue injection holes can pass through the glue passing holes.

[0013] Preferably, the spacer ring plate includes four arc-shaped plates arranged circumferentially, and adjacent arc-shaped plates are separated by the partition plate or the limiting plate.

[0014] Preferably, when the combined preformed fragments include multiple fragment units arranged in sequence from top to bottom, the auxiliary element is a flattening mechanism. The flattening mechanism includes a handle and a pressing head. The lower end of the handle is fixedly connected to the middle of the upper end of the pressing head. The pressing head is arc-shaped, and both side walls of the pressing head can respectively fit against both side walls of the filling gap. The pressing head can compact the fragments in the filling gap layer by layer, and make the fragments form multiple fragment units arranged in sequence from top to bottom in the filling gap.

[0015] Preferably, the top cover is connected to the upper end of the outer housing by bolts, and the top cover is annular. The inner ring of the top cover extends to the upper end of the inner housing.

[0016] The present invention also provides a forming method for the combined preformed fragments. Using the forming mold for the combined preformed fragments in the above technical solution, when the combined preformed fragments to be formed are multiple layers of fragment units sleeved inside and outside in sequence, the method includes the following steps:

[0017] SA1: Sleeve the outer housing on the outer periphery of the inner housing, and install the partition plate and the limiting plate between the outer housing and the inner housing;

[0018] SA2: Insert at least two spacer ring plates into the filling gap, and make each spacer ring plate be sleeved from outside to inside in sequence. The outer wall of the outermost spacer ring plate contacts the inner wall of the outer housing, and a first annular gap is formed between the inner wall of the innermost spacer ring plate and the outer wall of the inner housing. At the same time, use the partition plate and the limiting plate to limit the spacer ring plates in the radial direction;

[0019] SA3: Fill the first annular gap with the first fragments;

[0020] SA4: Install the top cover on the upper end of the outer housing, and the top cover seals the first annular gap;

[0021] SA5: Seal the gaps of the outer casing with glue. After the glue is completely cured, inject glue into the outer casing through the glue injection hole, and make the glue enter the first annular gap through the glue holes, so that the first fragments are bonded to form the innermost fragment unit;

[0022] SA6: Remove the top cover and take out the innermost gasket plate. The area where the innermost gasket plate is located forms a second annular gap;

[0023] SA7: Fill the second annular gap with second fragments;

[0024] SA8: Install the top cover at the upper end of the outer casing, and the top cover seals the second annular gap;

[0025] SA9: Seal the gaps of the outer casing with glue. After the glue is completely cured, inject glue into the outer casing through the glue injection hole, and make the glue enter the second annular gap through the glue holes, so that the second fragments are bonded to form the second layer of fragment units from the inside to the outside, and the innermost fragment unit is bonded and fixed to the second layer of fragment units from the inside to the outside;

[0026] SA10: Repeat SA6~SA9 until all the gasket plates are taken out and the filling gap is filled with multiple layers of fragment units. Thus, the combined preformed fragments composed of multiple layers of fragment units sleeved inside and outside in sequence are formed;

[0027] When the required combined preformed fragments are multiple fragment units arranged in sequence from top to bottom, the following steps are included:

[0028] SB1: Sleeve the outer casing around the outer periphery of the inner casing, and install the partition plate and the limiting plate between the outer casing and the inner casing;

[0029] SB2: Load a calculated number of first fragments into the filling gap. After tamping the first fragments, use a flattening mechanism to flatten the upper surface of the first fragments to form the lowermost layer of fragment units;

[0030] SB3: Continuously load a calculated number of second fragments on the upper surface of the first fragments. After tamping the second fragments, use a flattening mechanism to flatten the upper surface of the second fragments to form the second layer of fragment units from bottom to top;

[0031] SB4: Repeat SB3 until the filling gap is filled with multiple fragment units arranged vertically;

[0032] SB5: Install the top cover at the upper end of the outer casing, and the top cover seals the upper end of the filling gap;

[0033] SB6: Seal the gaps of the outer casing with glue. After the glue is completely cured, inject glue into the outer casing through the glue injection hole so that each fragment unit is bonded to form a whole. Thus, the combined preformed fragments composed of multiple fragment units arranged in sequence from top to bottom are formed.

[0034] The present invention has achieved the following technical effects compared with the prior art:

[0035] The forming die and forming method of the combined preformed fragments provided by the present invention. The outer casing is coaxially sleeved on the outer periphery of the inner casing, and a filling gap is formed between the outer casing and the inner casing. The filling gap is used to fill fragments. A glue injection hole is provided on the side wall of the outer casing to make combined preformed fragments by injecting glue into the fragments in the filling gap. At the same time, by restricting the size of the filling gap through the outer casing and the inner casing, it can ensure that the overall size of the combined preformed fragments completely meets the module design requirements. The base is connected to the lower ends of the outer casing and the inner casing, and the top cover is connected to the upper ends of the outer casing and the inner casing. Moreover, the top cover and the base can respectively seal the upper and lower ends of the filling gap to prevent glue from overflowing when injecting glue into the filling gap, which affects the bonding effect. When injecting glue into the filling gap through the glue injection hole, the fragments in the filling gap can be bonded to form fragment units, without repeated pasting, which is convenient to operate and reduces the risk of degumming. The auxiliary element is used to assist in filling the fragments into the filling gap layer by layer, and to form several fragment units in sequence to make combined preformed fragments. By reasonably designing the specifications of the fragments in each layer, the damage effect is improved. At the same time, the overall structure is simple, reliable and practical. Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0037] Figure 1 It is an exploded view of the forming die of the combined preformed fragments used in the second embodiment;

[0038] Figure 2 It is a structural schematic diagram of the forming die of the combined preformed fragments used in the third embodiment;

[0039] In the figure: 1 - inner casing, 2 - outer casing, 3 - top cover, 4 - partition board, 5 - limiting plate, 6 - gasket plate, 7 - glue injection hole, 8 - step protrusion, 9 - base, 10 - handle, 11 - pressing head. Detailed Embodiments

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] The purpose of the present invention is to provide a forming die and forming method for a combined prefabricated fragment to solve the problems existing in the prior art and realize the production of a multi-layer glue injection module with a simple overall structure and easy use.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Example 1

[0044] like Figure 1 - Figure 2 As shown, this embodiment provides a forming mold for a combined prefabricated fragment, including an outer shell 2, an inner shell 1, a top cover 3, a base 9 and an auxiliary element. The outer shell 2 is coaxially sleeved on the outer periphery of the inner shell 1, and a filling gap is formed between the outer shell 2 and the inner shell 1. The filling gap is used to fill fragments. A glue injection hole 7 is opened on the side wall of the outer shell 2 to form a combined prefabricated fragment by injecting glue into the fragments in the filling gap. At the same time, the size of the filling gap is limited by the outer shell 2 and the inner shell 1, which can ensure that the overall size of the combined prefabricated fragment fully meets the module design requirements. The base 9 is connected to the lower end of the outer shell 2 and the lower end of the inner shell 1. The top cover 3 is connected to the upper end of the outer shell 2 and the upper end of the inner shell 1, and the top cover 3 and the base 9 can respectively block the upper and lower ends of the filling gap to avoid the glue overflowing and affecting the bonding effect when injecting glue into the filling gap. When injecting glue into the filling gap through the glue injection hole 7, the fragments in the filling gap can be bonded to form fragment units, which does not need to be repeatedly pasted, is easy to operate, and reduces the risk of degumming. The auxiliary elements are used to assist in filling the fragments layer by layer into the filling gap, and to form several fragment units in sequence to make combined prefabricated fragments. The damage effect is improved by reasonably designing the specifications of each layer of fragments. At the same time, the overall structure is simple, reliable and practical.

[0045] Specifically, the outer shell 2 is a hollow cylinder, and the hollow cylinder is formed by buckling two semi-arc cylinders. The two semi-arc cylinders can be detachably connected, preferably by screws, which is convenient for installation and disassembly.

[0046] The upper end of the base 9 is provided with a stepped protrusion 8, and the lower end of the outer housing 2 is provided with a circular stepped surface. The outer housing 2 is located at the upper end of the base 9, and the stepped surface is in mating contact with the stepped protrusion 8. The inner housing 1 is located at the upper end of the stepped protrusion 8. Thus, the outer housing 2 can be limited in position through the cooperation of the stepped protrusion 8 and the stepped surface, preventing the outer housing 2 from moving towards the inner housing 1, which may affect subsequent fragment filling and the size limitation of the combined prefabricated fragments.

[0047] Two partitions 4 are symmetrically arranged in the filling gap. The two partitions 4 are respectively located at the two fastening positions of the outer housing 2, and the partition 4 is connected between the two semi-cylindrical bodies. One side of each partition 4 extends to the outer wall of the inner housing 1, and the other side of each partition 4 is connected to the two semi-cylindrical bodies. Preferably, the partition 4 and the semi-cylindrical body are fastened by screws. The partition 4 is provided with a clearance groove corresponding to the stepped protrusion 8 to facilitate the installation of the partition 4.

[0048] Two limit plates 5 are also symmetrically arranged in the filling gap. The two limit plates 5 and the two partitions 4 are arranged in a circular and uniform pattern in the filling gap, and the limit plates 5 and the partitions 4 are arranged alternately. Two outer card slots are symmetrically arranged at the upper end of the inner wall of the outer housing 2, two inner card slots are symmetrically arranged at the upper end of the outer wall of the inner housing 1, and two lower card slots are symmetrically arranged on the outer ring of the stepped protrusion 8. The two limit plates 5, the two outer card slots, the two inner card slots, and the two lower card slots correspond to each other one by one. The limit plate 5 supports in the filling gap and can limit the position between the outer housing 2 and the inner housing 1. One side of the upper end of the limit plate 5 is limit-connected to the outer card slot, the other side of the upper end of the limit plate 5 is limit-connected to the outer card slot, and the lower end of the limit plate 5 is limit-connected to the lower card slot. Thus, the limit plate 5 is stably installed between the outer housing 2 and the inner housing 1.

[0049] The limit plate 5 is T-shaped, and both sides of the large end of the limit plate 5 are respectively used for limit-connecting to the outer card slot and the inner card slot to achieve the stable installation of the limit plate 5.

[0050] The combined prefabricated fragment is preferably a spherical fully prefabricated fragment, and there is no limitation on the material of the fragment. Any material that does not undergo modification at the glue curing temperature and does not react chemically with the glue can be used. Preferably, the fragments in this embodiment are generally made of alloy or pure metal. For the glue used in this embodiment, it can be industrial silicone rubber, polyurethane glue, epoxy resin glue, etc. Those skilled in the art can select according to actual needs.

[0051] When the combined prefabricated fragment includes multiple fragment units sleeved inside and outside in sequence, such as Figure 1As shown, the auxiliary element includes several gasket plates 6, and each gasket plate 6 is coaxially sleeved in the filling gap, so that through the cooperation of multiple gasket plates 6, a multi-layer fragment unit that is sequentially sleeved inside and outside is formed, wherein the inner wall of the innermost gasket plate 6 and the outer wall of the inner shell 1 are used to form the innermost fragment unit. When filling the fragments, the fragments are first filled in this gap, and the position of the gasket plate 6 located at the outermost layer is used to form the outermost fragment unit. This gap is used to fill the fragments last. The position of each gasket plate 6 is used to form a layer of fragment unit, that is, each time a gasket plate 6 is removed, the remaining cavity is used to fill the fragments. The fragments of each layer can be of different specifications. The filling thickness of fragments of different specifications can be controlled by gasket plates 6 of different thicknesses. Each gasket plate 6 is provided with a glue hole, and the glue entering the outer shell 2 through the glue injection hole 7 can pass through the glue hole to ensure that the glue can reach the fragment smoothly.

[0052] The backing plate 6 comprises four circumferentially arranged arcuate plates, with adjacent arcuate plates separated by partitions 4 or limit plates 5. The partitions 4 and limit plates 5 limit the position of each backing plate 6, preventing the backing plate 6 from moving toward the inner shell 1 and affecting subsequent fragment filling.

[0053] When the combined prefabricated fragments include multiple fragment units arranged in sequence from top to bottom, such as Figure 2 As shown, the auxiliary element is a flattening mechanism. Each time a layer of fragments is filled into the filling gap (not directly filling the filling gap, but filling the fragments to a certain height in the filling gap), the flattening mechanism is used to compact it, and then the next layer of fragments is filled. The fragments of each layer can be of different specifications, and the filling height of fragments of different specifications can be controlled by the total weight of the fragments. The flattening mechanism includes a handle 10 and a pressure head 11. The lower end of the handle 10 is fixedly connected to the middle of the upper end of the pressure head 11. The pressure head 11 is arc-shaped, and the two side walls of the pressure head 11 can respectively fit the two side walls of the filling gap. Then, when the handle 10 is used to press the pressure head 11 downward into the filling gap, it is ensured that the pressure head 11 can compact the fragments in the filling gap and form a plurality of fragment units arranged in sequence from top to bottom in the filling gap.

[0054] The top cover 3 is connected to the upper end of the outer shell 2 by bolts, and the top cover 3 is annular, and the inner circle of the top cover 3 extends to the upper end of the inner shell 1 to ensure its sealing effect.

[0055] Through the above-mentioned design, this embodiment realizes the production of combined prefabricated fragments while ensuring that the size of the combined prefabricated fragments meets the design value as much as possible, while reducing the number of pasting times and lowering the risk of debonding. At the same time, all parts are specially surface treated, so that they can be directly demoulded without sticking.

[0056] Example 2

[0057] This embodiment provides a forming method for a combined prefabricated fragment, as Figure 1 shown. The forming mold for the combined prefabricated fragment in Embodiment 1 is used, and the combined prefabricated fragment to be formed is a multi-layer fragment unit sleeved inside and outside in sequence. Specifically, the following steps are included:

[0058] SA1: Sleeve the outer shell 2 on the outer periphery of the inner shell 1, and install the partition plate 4 and the limiting plate 5 between the outer shell 2 and the inner shell 1;

[0059] SA2: Insert at least two gasket plates 6 into the filling gap, and make each gasket plate 6 sleeved from the outside to the inside in sequence. The outer wall of the outermost gasket plate 6 contacts the inner wall of the outer shell 2, and a first annular gap is formed between the inner wall of the innermost gasket plate 6 and the outer wall of the inner shell 1. At the same time, use the partition plate 4 and the limiting plate 5 to limit the gasket plates 6 in the radial direction;

[0060] SA3: Fill the first annular gap with the first fragments;

[0061] SA4: Install the top cover 3 at the upper end of the outer shell 2, and the top cover 3 seals the first annular gap;

[0062] SA5: Use glue to seal each gap of the outer shell 2. After the glue is completely cured, inject glue into the outer shell 2 through the glue injection hole 7, and make the glue enter the first annular gap through the glue holes, so that the first fragments are bonded to form the innermost fragment unit;

[0063] SA6: Remove the top cover 3 and take out the innermost gasket plate 6. The area where the innermost gasket plate 6 is located forms a second annular gap;

[0064] SA7: Fill the second annular gap with the second fragments;

[0065] SA8: Install the top cover 3 at the upper end of the outer shell 2, and the top cover 3 seals the second annular gap;

[0066] SA9: Use glue to seal each gap of the outer shell 2. After the glue is completely cured, inject glue into the outer shell 2 through the glue injection hole 7, and make the glue enter the second annular gap through the glue holes, so that the second fragments are bonded to form the second layer of fragment unit from the inside to the outside, and the innermost fragment unit is bonded and fixed to the second layer of fragment unit from the inside to the outside;

[0067] SA10: Repeat SA6~SA9 until all the gasket plates 6 are taken out and the filling gap is filled with multi-layer fragment units. At this point, the combined prefabricated fragment composed of multi-layer fragment units sleeved inside and outside in sequence is formed, and the connection part is tight without gaps, and there will be no empty glue layer.

[0068] Embodiment Three

[0069] This embodiment provides a method for forming a combined prefabricated fragment, such as Figure 2 As shown, the forming mold of the combined prefabricated fragments in Example 1 is used, and the combined prefabricated fragments to be formed are multiple fragment units arranged in sequence from top to bottom, specifically including the following steps:

[0070] SB1: The outer shell 2 is placed on the outer periphery of the inner shell 1, and the partition 4 and the limit plate 5 are installed between the outer shell 2 and the inner shell 1;

[0071] SB2: Load the calculated number of first fragments into the filling gap, compact the first fragments, and use the flattening mechanism to flatten the upper surface of the first fragments to form the bottommost layer of fragment units;

[0072] SB3: A calculated number of second fragments are added to the upper surface of the first fragments. After the second fragments are compacted, the flattening mechanism is used to flatten the upper surface of the second fragments, forming a second layer of fragment units from bottom to top.

[0073] SB4: Repeat SB3 until the gap is filled with multiple fragment units arranged vertically.

[0074] SB5: Install the top cover 3 on the upper end of the outer shell 2, and the top cover 3 blocks the upper end of the filling gap;

[0075] SB6: Use glue to seal the gaps in the outer shell 2. After the glue is completely solidified, inject glue into the outer shell 2 through the glue injection hole 7 to bond the fragment units together to form a whole. At this point, a combined prefabricated fragment consisting of multiple fragment units arranged in sequence from top to bottom is formed, and the connecting parts are tight and without gaps, and there will be no empty glue layer.

[0076] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A forming mold for a combined prefabricated fragment, characterized in that: It includes an outer housing, an inner housing, a top cover, a base and auxiliary elements. The outer housing is coaxially sleeved on the outer periphery of the inner housing, and a filling gap is formed between the outer housing and the inner housing. The base is connected to the lower ends of the outer housing and the inner housing, and the top cover is connected to the upper ends of the outer housing and the inner housing. The top cover and the base can respectively seal the upper and lower ends of the filling gap. Fragments are filled in the filling gap. A glue injection hole is provided on the side wall of the outer housing. When injecting glue into the filling gap through the glue injection hole, the fragments in the filling gap can be bonded to form fragment units. The auxiliary elements are used to assist in layer-by-layer filling of fragments into the filling gap and to form several fragment units in sequence to make a combined preformed fragment; When the combined preformed fragment includes multiple layers of fragment units sleeved on each other from the inside to the outside, the auxiliary elements include several pad ring plates, and the pad ring plates are coaxially sleeved in the filling gap. The space between the inner wall of the innermost pad ring plate and the outer wall of the inner housing is used to form the innermost layer of fragment units. The position where the outermost pad ring plate is located is used to form the outermost layer of fragment units, and the positions where each pad ring plate is located are respectively used to form one layer of fragment units. Glue passing holes are provided on each pad ring plate, and the glue liquid entering the outer housing through the glue injection hole can pass through the glue passing holes; When the combined preformed fragment includes multiple fragment units arranged in sequence from top to bottom, the auxiliary element is a flattening mechanism. The flattening mechanism includes a handle and a pressing head. The lower end of the handle is fixedly connected to the middle of the upper end of the pressing head. The pressing head is arc-shaped, and the two side walls of the pressing head can respectively fit against the two side walls of the filling gap. The pressing head can compact the fragments in the filling gap layer by layer and make the fragments form multiple fragment units arranged in sequence from top to bottom in the filling gap.

2. The forming die for the combined prefabricated fragment according to claim 1, characterized in that: The outer housing is a hollow cylinder, and the hollow cylinder is formed by buckling two semi-circular cylinders, and the two semi-circular cylinders can be detachably connected.

3. The forming die for the combined prefabricated fragment according to claim 2, characterized in that: A stepped protrusion is provided at the upper end of the base, and a stepped surface is provided at the lower end of the outer housing. The outer housing is located above the base, and the stepped surface is in mating contact with the stepped protrusion. The inner housing is located above the stepped protrusion.

4. The forming die for the combined prefabricated fragment according to claim 3, characterized in that: Two partitions are symmetrically provided in the filling gap. The two partitions are respectively located at the two buckling positions of the outer housing, and the partitions are connected between the two semi-circular cylinders. One side of each partition extends to the outer wall of the inner housing, and the other side of each partition is connected to the two semi-circular cylinders. An avoidance groove is provided at the position of the partition corresponding to the stepped protrusion.

5. The forming die for the combined prefabricated fragment according to claim 4, characterized in that: Two limiting plates are symmetrically arranged in the filling gap. The two limiting plates and the two partition plates are annularly and evenly arranged in the filling gap, and the limiting plates and the partition plates are arranged alternately. Two outer clamping grooves are symmetrically arranged at the upper end of the inner wall of the outer shell body. Two inner clamping grooves are symmetrically arranged at the upper end of the outer wall of the inner shell body. Two lower clamping grooves are symmetrically arranged on the outer ring of the stepped protrusion. The two limiting plates, the two outer clamping grooves, the two inner clamping grooves and the two lower clamping grooves correspond to each other one by one. The limiting plate supports in the filling gap, and one side of the upper end of the limiting plate is limited and connected in the outer clamping groove, and the other side of the upper end of the limiting plate is limited and connected in the outer clamping groove. The lower end of the limiting plate is limited and connected in the lower clamping groove. The limiting plate is T-shaped, and both sides of the large end of the limiting plate are respectively used for limiting and connecting the outer clamping groove and the inner clamping groove.

6. The forming die of the combined prefabricated fragment according to claim 5, characterized in that: The gasket ring plate includes four arc-shaped plates arranged circumferentially. Adjacent arc-shaped plates are separated by the partition plate or the limiting plate.

7. The forming die for the combined prefabricated fragment according to claim 1, characterized in that: The top cover is connected to the upper end of the outer shell body by bolts, and the top cover is annular. The inner ring of the top cover extends to the upper end of the inner shell body.

8. A forming method of a combined prefabricated fragment, characterized in that: When using the forming die for the combined prefabricated fragment according to any one of claims 1-7, when the combined prefabricated fragment to be formed is a multi-layer fragment unit sleeved inside and outside in sequence, the following steps are included: SA1: Sleeve the outer shell body on the outer periphery of the inner shell body, and install the partition plate and the limiting plate between the outer shell body and the inner shell body. SA2: Insert at least two gasket ring plates into the filling gap, and make each gasket ring plate sleeved from outside to inside in sequence. The outer wall of the gasket ring plate located in the outermost layer contacts the inner wall of the outer shell body. A first annular gap is formed between the inner wall of the gasket ring plate located in the innermost layer and the outer wall of the inner shell body. At the same time, use the partition plate and the limiting plate to limit the gasket ring plate in the radial direction. SA3: Fill the first annular gap with the first fragments. SA4: Install the top cover on the upper end of the outer shell body, and the top cover seals the first annular gap. SA5: Use glue to seal each gap of the outer shell body. After the glue is completely cured, inject glue into the outer shell body through the glue injection hole, and make the glue enter the first annular gap through the glue hole, so that the first fragments are bonded to form the innermost fragment unit. SA6: Remove the top cover and take out the gasket ring plate located in the innermost layer. A second annular gap is formed in the area where the innermost gasket ring plate is located. SA7: Fill the second annular gap with the second fragments. SA8: Install the top cover on the upper end of the outer shell body, and the top cover seals the second annular gap. SA9: Use glue to seal each gap of the outer shell body. After the glue is completely cured, inject glue into the outer shell body through the glue injection hole, and make the glue enter the second annular gap through the glue hole, so that the second fragments are bonded to form the second layer of fragment unit from inside to outside, and the innermost fragment unit is bonded and fixed to the second layer of fragment unit from inside to outside. SA10: Repeat SA6~SA9 until all gasket ring plates are taken out and the filling gap is filled with multi-layer fragment units. At this time, the combined prefabricated fragment composed of multi-layer fragment units sleeved inside and outside in sequence is formed. When the combined preformed fragments to be formed are multiple fragment units arranged in sequence from top to bottom, the following steps are included: SB1: Sleeves the outer shell on the outer periphery of the inner shell, and installs the partition plate and the limiting plate between the outer shell and the inner shell; SB2: Loads the calculated number of first fragments into the filling gap, compacts the first fragments, and then uses a flattening mechanism to flatten the upper surface of the first fragments to form the lowest layer of fragment units; SB3: Continuously loads the calculated number of second fragments on the upper surface of the first fragments, compacts the second fragments, and then uses a flattening mechanism to flatten the upper surface of the second fragments to form the second layer of fragment units from bottom to top; SB4: Repeats SB3 until the filling gap is filled with multiple fragment units arranged vertically; SB5: Installs the top cover at the upper end of the outer shell, and the top cover seals the upper end of the filling gap; SB6: Uses glue to seal each gap of the outer shell. After the glue is completely cured, injects glue into the outer shell through the glue injection hole so that each fragment unit is bonded into a whole. Thus, the combined preformed fragments composed of multiple fragment units arranged in sequence from top to bottom are formed.

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