Forming die and forming method for combined prefabricated fragments

Abstract

The invention discloses a forming mold and a forming method of a combined prefabricated fragment, and relates to the technical field of forming molds, the forming mold comprises an outer shell, an inner shell, a top cover, a base and an auxiliary element, the outer shell coaxially sleeves the periphery of the inner shell, a filling gap is formed between the outer shell and the inner shell, and the base is connected to the lower end of the outer shell and the lower end of the inner shell; the top cover is connected to the upper end of the outer shell and the upper end of the inner shell, the top cover and the base can block the upper end and the lower end of the filling gap correspondingly, the filling gap is used for being filled with fragments, glue injection holes are formed in the side wall of the outer shell, and when glue is injected into the filling gap through the glue injection holes, the fragments in the filling gap can be bonded to form fragment units. The auxiliary elements are used for assisting in filling the filling gaps with the fragments layer by layer, and the multiple fragment units are sequentially formed to form the combined prefabricated fragment. The multi-layer glue injection module can be manufactured, the overall structure is simple, and use is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of forming dies, and in particular to a forming die and a forming method for a combined prefabricated fragment. Background Art

[0002] Tungsten alloy prefabricated fragments are generally used in ammunition such as mines and grenades, and are used to kill manpower components.

[0003] In the application of prefabricated fragments for large bombs, more and more people are using tungsten alloy (or other materials) to process into spherical fully prefabricated fragments, and then pour them into modules with special silicone in the mold, and use special glue to stick the modules on the shell. The existing design scheme tends to use single-specification fragments, which has the advantages of easy design and mass production, but single-specification fragments also have disadvantages, that is, there are design limitations.

[0004] In recent years, in order to maximize the damage effect, the arrangement of fragments has increasingly shown a trend of mixed arrangement of large and small fragments, and 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 to make each single-specification fragment into a module separately, and then paste each module in sequence at the corresponding position. The advantage of this process is that the mold is simple to make and easy to operate. However, the disadvantages are also obvious, that is, during the pasting process of the module, as the glue is applied layer by layer, the overall thickness of the module gradually becomes uncontrollable, and as the number of pastings increases, the risk of degumming gradually increases, which directly affects the assembly of the charge or other subsequent parts. Summary of the invention

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

[0006] To achieve the above object, the present invention provides the following solutions: The present invention provides a forming mold for combined prefabricated fragments, comprising an outer shell, an inner shell, a top cover, a base and an auxiliary element, wherein 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 end of the outer shell and the lower end of the inner shell, the top cover is connected to the upper end of the outer shell and the upper end of the inner shell, and the top cover and the base can respectively block the upper and lower ends of the filling gap, the filling gap is used to fill fragments, a glue injection hole is opened on the side wall of the outer shell, and when glue is injected into the filling gap through the glue injection hole, the fragments in the filling gap can be bonded to form a fragment unit, and the auxiliary element is used to assist in filling the fragments into the filling gap layer by layer, and a plurality of fragment units are formed in sequence to form a combined prefabricated fragment.

[0007] Preferably, the outer shell is a hollow cylinder, and the hollow cylinder is formed by buckling two semi-arc cylinders, and the two semi-arc cylinders are detachably connected.

[0008] Preferably, a step protrusion is provided at the upper end of the base, a circle of step surfaces is provided at the lower end of the outer shell, the outer shell is located at the upper end of the base, and the step surface is in mating contact with the step protrusion, and the inner shell is located at the upper end of the step protrusion.

[0009] Preferably, two partitions are symmetrically arranged in the filling gap, the two partitions are respectively located at the two snap-fitting positions of the outer shell, and the partitions are connected between the two semi-arc cylinders, one side of each partition extends to the outer wall of the inner shell, the other side of each partition is connected to the two semi-arc cylinders, and the partitions are provided with avoidance grooves at the positions corresponding to the step protrusions.

[0010] Preferably, two limit plates are symmetrically provided in the filling gap, the two limit plates and the two partitions are evenly arranged in a ring shape in the filling gap, and the limit plates and the partitions are alternately arranged, two outer card grooves are symmetrically provided at the upper end of the inner wall of the outer shell body, two inner card grooves are symmetrically provided at the upper end of the outer wall of the inner shell body, and two lower card grooves are symmetrically provided on the outer ring of the step protrusion, and the two limit plates, the two outer card grooves, the two inner card grooves and the two lower card grooves correspond to each other one by one, the limit plate is supported in the filling gap, and one side of the upper end of the limit plate is limit-connected to the outer card groove, the other side of the upper end of the limit plate is limit-connected to the outer card groove, and the lower end of the limit plate is limit-connected to the lower card groove; the limit plate is T-shaped, and the two sides of the large end of the limit plate are respectively used for limit-connecting the outer card groove and the inner card groove.

[0011] Preferably, when the combined prefabricated fragment includes a multi-layer fragment unit that is sequentially sleeved inside and outside, the auxiliary element includes a plurality of gasket plates, and each of the gasket plates is coaxially sleeved in the filling gap, and the gasket plate located between the inner wall of the innermost gasket plate and the outer wall of the inner shell is used to form the innermost fragment unit, and the position of the gasket plate located at the outermost gasket plate is used to form the outermost fragment unit, and the positions of each gasket plate are respectively used to form a layer of fragment unit, and each gasket plate is provided with a glue hole, and the glue liquid that enters the outer shell through the glue injection hole can pass through the glue hole.

[0012] Preferably, the gasket ring plate includes four arc-shaped plates arranged circumferentially, and adjacent arc-shaped plates are separated by the partition plate or the limiting plate.

[0013] Preferably, when the combined prefabricated fragments include a plurality of fragment units arranged in sequence from top to bottom, the auxiliary element is a flattening mechanism, which includes a handle and a pressure head, the lower end of the handle is fixedly connected to the middle of the upper end of the pressure head, the pressure head is arc-shaped, and the two side walls of the pressure head can respectively fit the two side walls of the filling gap, the pressure head can compact the fragments in the filling gap in layers, and form a plurality of fragment units arranged in sequence from top to bottom in the filling gap.

[0014] Preferably, the top cover is connected to the upper end of the outer shell by bolts, and the top cover is annular, and the inner circle of the top cover extends to the upper end of the inner shell.

[0015] The present invention also provides a method for forming a combined prefabricated fragment, using the forming mold of the combined prefabricated fragment described in the above technical solution, when the combined prefabricated fragment to be formed is a multi-layer fragment unit with inner and outer layers sequentially arranged, the method comprises the following steps: SA1: The outer shell is sleeved on the outer periphery of the inner shell, and the partition plate and the limit plate are installed between the outer shell and the inner shell; SA2: insert at least two gasket plates into the filling gap, and arrange the gasket plates in sequence from outside to inside, and the outer wall of the gasket plate located at the outermost layer contacts the inner wall of the outer shell, and a first-shaped gap is formed between the inner wall of the gasket plate located at the innermost layer and the outer wall of the inner shell, and at the same time, a partition plate and a limiting plate are used to limit the gasket plate in radial direction; SA3: Fill the first fragment in the first annular gap; SA4: Install the top cover on the upper end of the outer shell, and the top cover blocks the first annular gap; SA5: Use glue to seal the gaps of the outer shell. After the glue is completely solidified, inject glue into the outer shell through the glue injection hole, and let the glue pass through the glue hole into the first annular gap, so that the first fragments are bonded to form the innermost fragment unit. SA6: Remove the top cover and take out the innermost gasket ring plate. The area where the innermost gasket ring plate is located forms a second annular gap. SA7: Fill the second annular gap with the second fragment; SA8: Install the top cover on the upper end of the outer shell, and the top cover blocks the second annular gap; SA9: Use glue to seal the gaps of the outer shell. After the glue is completely solidified, inject glue into the outer shell through the glue injection hole, and let the glue enter the second annular gap through the glue hole, so that the second fragments are bonded to form a second layer of fragment units from the inside to the outside, and the innermost layer of fragment units are bonded and fixed to the second layer of fragment units from the inside to the outside; SA10: Repeat SA6 to SA9 until all the gasket plates are removed and the filling gap is filled with multi-layer fragment units. At this point, a combined prefabricated fragment consisting of multi-layer fragment units sequentially arranged inside and outside is formed; When the combined prefabricated fragments to be formed are a plurality of fragment units arranged in sequence from top to bottom, the method comprises the following steps: SB1: The outer shell is sleeved on the outer periphery of the inner shell, and the partition plate and the limit plate are installed between the outer shell and the inner shell; SB2: Load the calculated number of first fragments into the filling gap, compact the first fragments, and use a flattening mechanism to flatten the upper surface of the first fragments to form the fragment unit at the bottom layer; SB3: Continue to load a calculated number of second fragments on the upper surface of the first fragment, and use a flattening mechanism to flatten the upper surface of the second fragment after the second fragment is jarred, so as to form a second layer of fragment units from bottom to top; SB4: Repeat SB3 until the gap is filled with multiple fragment units arranged vertically; SB5: Install the top cover on the upper end of the outer shell, and the top cover blocks the upper end of the filling gap; SB6: Use glue to seal the gaps in the outer shell. After the glue is completely solidified, inject glue into the outer shell through the glue injection hole to bond each fragment unit 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.

[0016] Compared with the prior art, the present invention has achieved the following technical effects: The present invention provides a forming mold and forming method for combined prefabricated fragments. 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 filling gap is used to fill the fragments. The side wall of the outer shell is provided with a glue injection hole, so that the combined prefabricated fragments are formed 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 and the inner shell, so that the overall size of the combined prefabricated fragments can be guaranteed to fully meet the module design requirements. The base is connected to the lower end of the outer shell and the lower end of the inner shell, and the top cover is connected to the upper end of the outer shell and the inner shell. The upper end of the body, and the top cover and the base can respectively seal the upper and lower ends of the filling gap to prevent the glue from 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, the fragments in the filling gap can be bonded to form a fragment unit. There is no need for repeated pasting, which is convenient to operate and reduces the risk of debonding. The auxiliary elements are used to assist in filling the fragments layer by layer in the filling gap, and several fragment units are formed in turn 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. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 An exploded view of a forming die for combined prefabricated fragments used in Example 2; Figure 2 It is a structural schematic diagram of the forming mold of the combined prefabricated fragments used in the third embodiment; In the figure: 1-inner shell, 2-outer shell, 3-top cover, 4-partition, 5-limiting plate, 6-gasket plate, 7-glue injection hole, 8-step protrusion, 9-base, 10-handle, 11-pressing head. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0020] The purpose of the present invention is to provide a forming mold and a forming method for a combined prefabricated fragment, so as to solve the problems existing in the prior art and realize the production of a multi-layer glue injection module, and the overall structure is simple and easy to use.

[0021] 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.

[0022] Embodiment 1 like Figure 1-Figure 2 As shown, the present embodiment provides a forming mold for a combined prefabricated fragment, comprising 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 the fragments. A glue injection hole 7 is provided 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, so that the overall size of the combined prefabricated fragment can fully meet 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 a fragment unit, which does not need to be repeatedly pasted, is easy to operate, and reduces the risk of degumming. The auxiliary element is used to assist in filling the fragments layer by layer into the filling gap, and a number of fragment units are formed in sequence to make a combined prefabricated fragment, and 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.

[0023] 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, so that installation and disassembly are convenient.

[0024] A step protrusion 8 is provided at the upper end of the base 9, and a circle of step surfaces is provided at the lower end of the outer shell 2. The outer shell 2 is located at the upper end of the base 9, and the step surface is in contact with the step protrusion 8. The inner shell 1 is located at the upper end of the step protrusion 8. The step protrusion 8 and the step surface can be used to limit the outer shell 2 through the cooperation of the step protrusion 8 and the step surface, so as to prevent the outer shell 2 from moving toward the inner shell 1, affecting the subsequent fragment filling, and the size limitation of the combined prefabricated fragments.

[0025] Two partitions 4 are symmetrically arranged in the filling gap, and the two partitions 4 are respectively located at two buckling parts of the outer shell 2, and the partitions 4 are connected between the two semi-arc cylinders. One side of each partition 4 extends to the outer wall of the inner shell 1, and the other side of each partition 4 is connected to the two semi-arc cylinders, and the partitions 4 and the semi-arc cylinders are preferably fastened by screws, and the partitions 4 are provided with air avoidance grooves at the positions corresponding to the step protrusions 8 to realize the installation of the partitions 4.

[0026] Two limit plates 5 are also symmetrically arranged in the filling gap. The two limit plates 5 and the two partitions 4 are evenly arranged in a ring shape in the filling gap, and the limit plates 5 and the partitions 4 are alternately arranged. Two outer card grooves are symmetrically provided on the upper end of the inner wall of the outer shell 2, and two inner card grooves are symmetrically provided on the upper end of the outer wall of the inner shell 1. The outer circle of the step protrusion 8 is symmetrically provided with two lower card grooves, and the two limit plates 5, the two outer card grooves, the two inner card grooves and the two lower card grooves correspond to each other one by one. The limit plate 5 is supported in the filling gap and can limit the outer shell 2 and the inner shell 1. One side of the upper end of the limit plate 5 is limitedly connected to the outer card groove, and the other side of the upper end of the limit plate 5 is limitedly connected to the outer card groove. The lower end of the limit plate 5 is limitedly connected to the lower card groove, thereby realizing the stable installation of the limit plate 5 between the outer shell 2 and the inner shell 1.

[0027] The limiting plate 5 is T-shaped, and two sides of the large end of the limiting plate 5 are respectively used for limiting connection with the outer card slot and the inner card slot, so as to achieve stable installation of the limiting plate 5.

[0028] The combined prefabricated fragments are preferably spherical prefabricated fragments, and the material of the fragments is not limited. Any material that does not undergo modification at the curing temperature of the glue and does not undergo chemical reaction with the glue can be used. As a preference, the fragments in this embodiment are generally made of alloy or pure metal. The glue used in this embodiment can be industrial silicone rubber, polyurethane glue, epoxy resin glue, etc., and those skilled in the art can select according to actual needs.

[0029] When the combined prefabricated fragments include multiple layers of fragment units that are sequentially arranged inside and outside, such as Figure 1As shown, the auxiliary element includes a plurality of 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 layer of 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 layer of fragment unit. This gap is used to fill the fragments last. The positions of each gasket plate 6 are respectively 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, and the filling thickness of the 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 smoothly reach the fragments.

[0030] The gasket plate 6 includes four arc plates arranged circumferentially, and adjacent arc plates are separated by partition plates 4 or limit plates 5. By setting the partition plates 4 and limit plates 5, each gasket plate 6 can be limited to prevent the gasket plate 6 from moving toward the inner shell 1 and affecting the subsequent filling of fragments.

[0031] When the combined prefabricated fragments include a plurality of 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. Each layer of fragments 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.

[0032] 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.

[0033] Through the above design, this embodiment can realize 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 the risk of debonding. At the same time, all parts are subjected to special surface treatment, so that they can be demoulded directly without gluing.

[0034] Embodiment 2 This embodiment provides a method for forming a combined prefabricated fragment, such as Figure 1 As shown, the forming mold of the combined prefabricated fragments in the first embodiment is used, and the combined prefabricated fragments to be formed are multi-layer fragment units with inner and outer layers sequentially arranged, and specifically include the following steps: SA1: The outer shell 2 is sleeved on the outer periphery of the inner shell 1, and the partition plate 4 and the limit plate 5 are installed between the outer shell 2 and the inner shell 1; SA2: insert at least two gasket plates 6 into the filling gap, and arrange the gasket plates 6 in sequence from outside to inside, and the outer wall of the gasket plate 6 located at the outermost layer contacts the inner wall of the outer shell 2, and a first-shaped gap is formed between the inner wall of the gasket plate 6 located at the innermost layer and the outer wall of the inner shell 1, and at the same time, the partition plate 4 and the limiting plate 5 are used to limit the gasket plate 6 in radial direction; SA3: Fill the first fragment in the first annular gap; SA4: Install the top cover 3 on the upper end of the outer shell 2, and the top cover 3 blocks the first annular gap; SA5: Use glue to seal the gaps of the outer shell 2. After the glue is completely solidified, inject glue into the outer shell 2 through the glue injection hole 7, and let the glue pass through the glue hole into the first annular gap, so that the first fragments are bonded to form the innermost fragment unit; SA6: Remove the top cover 3 and take out the innermost gasket ring plate 6. The area where the innermost gasket ring plate 6 is located forms a second annular gap; SA7: Fill the second annular gap with the second fragment; SA8: Install the top cover 3 on the upper end of the outer shell 2, and the top cover 3 blocks the second annular gap; SA9: Use glue to seal the gaps of the outer shell 2. After the glue is completely solidified, inject glue into the outer shell 2 through the glue injection hole 7, and let the glue pass through the glue hole into the second annular gap, so that the second fragments are bonded to form a second layer of fragment units from the inside to the outside, and the innermost layer of fragment units are bonded and fixed to the second layer of fragment units from the inside to the outside; SA10: Repeat SA6 to SA9 until all the gasket plates 6 are taken out and the filling gap is filled with multi-layer fragment units. At this point, a combined prefabricated fragment composed of multi-layer fragment units sequentially arranged inside and outside is formed, and the connecting parts are tight without gaps, and no empty glue layer will appear.

[0035] Embodiment 3 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 the first embodiment is used, and the combined prefabricated fragments to be formed are a plurality of fragment units arranged in sequence from top to bottom, specifically including the following steps: SB1: The outer shell 2 is sleeved on the outer periphery of the inner shell 1, and the partition plate 4 and the limit plate 5 are installed between the outer shell 2 and the inner shell 1; SB2: Load the calculated number of first fragments into the filling gap, compact the first fragments, and use a flattening mechanism to flatten the upper surface of the first fragments to form the fragment unit at the bottom layer; SB3: Continue to load a calculated number of second fragments on the upper surface of the first fragment, and use a flattening mechanism to flatten the upper surface of the second fragment after the second fragment is jarred, so as to form a second layer of fragment units from bottom to top; SB4: Repeat SB3 until the gap is filled with multiple fragment units arranged vertically; 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; SB6: Use glue to seal the gaps of 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 to form a whole. At this point, a combined prefabricated fragment composed of multiple fragment units arranged in sequence from top to bottom is formed, and the connecting parts are tight without gaps, and no empty glue layer will appear.

[0036] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A combined prefabricated fragment forming die, characterized in that: The invention comprises an outer shell, an inner shell, a top cover, a base and an auxiliary element. 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 end of the outer shell and the lower end of the inner shell. The top cover is connected to the upper end of the outer shell and the upper end of the inner shell. The top cover and the base can respectively block the upper and lower ends of the filling gap. The filling gap is used to fill fragments. A glue injection hole is provided on the side wall of the outer shell. When glue is injected into the filling gap through the glue injection hole, the fragments in the filling gap can be bonded to form a fragment unit. The auxiliary element is used to assist in filling the fragments into the filling gap layer by layer, and a plurality of fragment units are formed in sequence to form a combined prefabricated fragment.

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

3. The forming mold for combined prefabricated fragments according to claim 2, characterized in that: The upper end of the base is provided with a step protrusion, the lower end of the outer shell is provided with a circle of step surfaces, the outer shell is located at the upper end of the base, and the step surface is in contact with the step protrusion, and the inner shell is located at the upper end of the step protrusion.

4. The forming die for combined prefabricated fragments according to claim 3, characterized in that: Two partitions are symmetrically arranged in the filling gap, and the two partitions are respectively located at the two buckling parts of the outer shell, and the partitions are connected between the two semi-arc cylinders. One side of each partition extends to the outer wall of the inner shell, and the other side of each partition is connected to the two semi-arc cylinders, and the partitions are provided with avoidance grooves at the positions corresponding to the step protrusions.

5. The forming die for combined prefabricated fragments according to claim 4, characterized in that: Two limit plates are symmetrically arranged in the filling gap, the two limit plates and the two partitions are evenly arranged in a ring shape in the filling gap, and the limit plates and the partitions are alternately arranged, two outer card grooves are symmetrically arranged on the upper end of the inner wall of the outer shell body, two inner card grooves are symmetrically arranged on the upper end of the outer wall of the inner shell body, and two lower card grooves are symmetrically arranged on the outer ring of the step protrusion, and the two limit plates, the two outer card grooves, the two inner card grooves and the two lower card grooves correspond to each other one by one, the limit plate is supported in the filling gap, and one side of the upper end of the limit plate is limit-connected to the outer card groove, the other side of the upper end of the limit plate is limit-connected to the outer card groove, and the lower end of the limit plate is limit-connected to the lower card groove; the limit plate is T-shaped, and the two sides of the large end of the limit plate are respectively used for limit-connecting the outer card groove and the inner card groove.

6. The forming die for combined prefabricated fragments according to claim 5, characterized in that: When the combined prefabricated fragment includes a multi-layer fragment unit that is sequentially sleeved inside and outside, the auxiliary element includes a plurality of gasket plates, and each of the gasket plates is coaxially sleeved in the filling gap, and the gasket plate located between the inner wall of the innermost gasket plate and the outer wall of the inner shell is used to form the innermost fragment unit, and the position of the gasket plate located at the outermost layer is used to form the outermost fragment unit, and the positions of each gasket plate are respectively used to form a layer of fragment unit, and each gasket plate is provided with a glue hole, and the glue liquid entering the outer shell through the glue injection hole can pass through the glue hole.

7. The forming die for combined prefabricated fragments according to claim 6, characterized in that: The gasket ring plate includes four arc-shaped plates arranged circumferentially, and adjacent arc-shaped plates are separated by the partition plate or the limiting plate.

8. The forming die for combined prefabricated fragments according to claim 5, characterized in that: When the combined prefabricated fragments include a plurality of fragment units arranged in sequence from top to bottom, the auxiliary element is a flattening mechanism, which includes a handle and a pressure head. The lower end of the handle is fixedly connected to the middle of the upper end of the pressure head. The pressure head is arc-shaped, and the two side walls of the pressure head can respectively fit the two side walls of the filling gap. The pressure head can compact the fragments in the filling gap in layers and form a plurality of fragment units arranged in sequence from top to bottom in the filling gap.

9. The forming mold for combined prefabricated fragments according to claim 1, characterized in that: The top cover is connected to the upper end of the outer shell by bolts, and the top cover is annular, and the inner circle of the top cover extends to the upper end of the inner shell.

10. A method for forming a combined prefabricated fragment, characterized in that: The forming mold of the combined prefabricated fragments according to any one of claims 1 to 9, when the combined prefabricated fragments to be formed are multi-layered fragment units with inner and outer layers sequentially arranged, comprises the following steps: SA1: The outer shell is sleeved on the outer periphery of the inner shell, and the partition plate and the limit plate are installed between the outer shell and the inner shell; SA2: insert at least two gasket plates into the filling gap, and arrange the gasket plates in sequence from outside to inside, and the outer wall of the gasket plate located at the outermost layer contacts the inner wall of the outer shell, and a first-shaped gap is formed between the inner wall of the gasket plate located at the innermost layer and the outer wall of the inner shell, and at the same time, a partition plate and a limiting plate are used to limit the gasket plate in radial direction; SA3: Fill the first fragment in the first annular gap; SA4: Install the top cover on the upper end of the outer shell, and the top cover blocks the first annular gap; SA5: Use glue to seal the gaps of the outer shell. After the glue is completely solidified, inject glue into the outer shell through the glue injection hole, and let the glue pass through the glue hole into the first annular gap, so that the first fragments are bonded to form the innermost fragment unit. SA6: Remove the top cover and take out the innermost gasket ring plate. The area where the innermost gasket ring plate is located forms a second annular gap. SA7: Fill the second annular gap with the second fragment; SA8: Install the top cover on the upper end of the outer shell, and the top cover blocks the second annular gap; SA9: Use glue to seal the gaps of the outer shell. After the glue is completely solidified, inject glue into the outer shell through the glue injection hole, and let the glue enter the second annular gap through the glue hole, so that the second fragments are bonded to form a second layer of fragment units from the inside to the outside, and the innermost layer of fragment units are bonded and fixed to the second layer of fragment units from the inside to the outside; SA10: Repeat SA6 to SA9 until all the gasket plates are removed and the filling gap is filled with multi-layer fragment units. At this point, a combined prefabricated fragment consisting of multi-layer fragment units sequentially arranged inside and outside is formed; When the combined prefabricated fragments to be formed are a plurality of fragment units arranged in sequence from top to bottom, the method comprises the following steps: SB1: The outer shell is sleeved on the outer periphery of the inner shell, and the partition plate and the limit plate are installed between the outer shell and the inner shell; SB2: Load the calculated number of first fragments into the filling gap, compact the first fragments, and use a flattening mechanism to flatten the upper surface of the first fragments to form the fragment unit at the bottom layer; SB3: Continue to load a calculated number of second fragments on the upper surface of the first fragment, and use a flattening mechanism to flatten the upper surface of the second fragment after the second fragment is jarred, so as to form a second layer of fragment units from bottom to top; SB4: Repeat SB3 until the gap is filled with multiple fragment units arranged vertically; SB5: Install the top cover on the upper end of the outer shell, and the top cover blocks the upper end of the filling gap; SB6: Use glue to seal the gaps in the outer shell. After the glue is completely solidified, inject glue into the outer shell through the glue injection hole to bond each fragment unit 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.

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