Joint body, mold assembly, mold and molding method
By using the design of the middle plate insert pin and the middle plate, a simple mold molding of the three-color joint body was achieved, solving the problems of complex structure and high cost of traditional molds, and realizing a low-cost and high-efficiency molding process.
Patent Information
- Application Number
- CN202511898116.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-02-27
AI Technical Summary
Traditional three-color joint structure molds are complex, requiring three injection molding machines and three sets of molds, resulting in high and unreasonable molding costs.
The design employs a middle plate insert and middle plate structure, enabling the middle plate to rise, fall, and rotate. The three-color joint body is molded using a single mold, and the joint body is stably formed using a drive assembly and a striker.
It simplifies the mold structure, reduces molding costs, and improves molding efficiency and stability.
Smart Images
Figure CN121570822A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of toy technology, and more specifically, to a joint body, a mold assembly, a mold, and a molding method. Background Technology
[0002] To increase stability, traditional tri-color joint structures can have an additional block molded on the outside of the first and second rotating blocks, so that the three parts form a tri-color joint that is not detachable, thus solving the problem of poor stability.
[0003] However, in actual molding, the external overmolding mold often requires three injection molding machines and three sets of molds, resulting in a complex mold structure, increased molding costs, and an unreasonable structural design. Summary of the Invention
[0004] In view of the deficiencies in the prior art, the purpose of this invention is to provide a joint body, a mold assembly, a mold, and a molding method.
[0005] According to the present invention, a joint body includes a first block, a second block, and a block body; The building block body forms a revolute joint with at least one of the first and second building blocks, allowing the building block body to be integrally formed on the first and second building blocks, and allowing the first building block to rotate relative to the second building block while preventing the first and second building blocks from detaching from the building block body, wherein: The first block has a first groove.
[0006] Preferably, the building block has a central pillar, and at least one of the first and second building blocks has a hole structure, or the building block has a hole structure, and at least one of the first and second building blocks has a central pillar, wherein the hole structure and the central pillar form the rotating pair, and the central pillar extends into the hole structure.
[0007] Preferably, the second block has a second groove.
[0008] Preferably, the first building block includes a first pivot end, a first intermediate section, and a first end connected in sequence, and the second building block includes a second pivot end, a second intermediate section, and a second end connected in sequence.
[0009] Preferably, the first slot is disposed on the first intermediate section or the first end.
[0010] Preferably, the second groove is disposed on the second middle section or the second end.
[0011] Preferably, the first end is a ball-head or ball-and-socket structure, and the second end is a ball-head or ball-and-socket structure.
[0012] Preferably, both the first groove and the second groove are blind holes.
[0013] Preferably, the depth of the blind hole is 0.5 to 1.5 mm.
[0014] Preferably, the depth of the blind hole is 0.6 to 1.4 mm.
[0015] Preferably, the depth of the blind hole is 0.7 to 1.3 mm.
[0016] Preferably, the depth of the blind hole is 0.8 to 1.2 mm.
[0017] Preferably, the depth of the blind hole is 0.9 to 1.1 mm.
[0018] Preferably, the cross-section of the blind hole is circular, elliptical, D-shaped, crescent-shaped, trapezoidal, or regular polygonal.
[0019] Preferably, the cross-section of the blind hole is circular, and the diameter of the blind hole is 1.2 to 1.5 mm.
[0020] Preferably, the diameter of the blind hole is 1.3 to 1.4 mm.
[0021] Preferably, the hole structure on the first and second building blocks adopts any of the following structures: Both the first and second building blocks have hole structures and are through holes, and the intermediate column passes through the through holes in the first and second building blocks; Both the first and second building blocks have hole structures, and both are blind holes. The intermediate column is divided into two sections, one of which extends into the blind hole penetrating the first building block, and the other of which extends into the blind hole on the second building block. The first or second building block has a hole structure and is a blind hole. The intermediate column extends into the blind hole on the first or second building block. The first and second building blocks have a matching concave-convex structure that prevents the first and second building blocks from leaving the building block body.
[0022] According to the present invention, a mold assembly is provided for molding the joint body, including a middle plate insert, a middle plate, and a drive assembly; The middle plate has a first cavity and a second cavity. The first cavity is used to form part or all of the first building block, and the second cavity is used to form part or all of the second building block. The middle plate pin is movable between a first position and a second position. When the middle plate pin is in the first position, the end of the middle plate pin extends into the first cavity and / or the second cavity. When the middle plate pin is in the second position, the middle plate pin is outside the first cavity and the second cavity. The drive assembly is capable of driving the middle plate to move between the third position and the fourth position, and is capable of driving the middle plate to rotate between the initial angle, the intermediate angle, and the end angle when the middle plate is in the fourth position; When the middle plate is in the third position and at the initial angle, it can mold the first building block; When the middle plate is in the third position and at the intermediate angle, the second building block can be molded; When the middle plate is in the third position and at the end angle, the building block can be molded; in: When the first molded block rotates with the middle plate from the initial angle to the middle angle, the end of the middle plate insert extends into the first cavity; when the first and second molded blocks rotate with the middle plate from the middle angle to the end angle, the end of the middle plate insert extends into the first cavity.
[0023] It should be noted that when the first and second building blocks, after being molded, rotate with the middle plate from the middle angle to the end angle, the end of the middle plate insert can also be configured to extend into the first cavity and the second cavity at the same time, which can also achieve the effect of keeping the first and second building blocks stably on the middle plate during the rotation of the middle plate.
[0024] According to a molding method for a joint body provided by the present invention, molding is performed using a mold assembly, and includes the following steps: Step 1: Control the middle plate to the third position and at the initial angle, and mold the first building block; Step 2: After the mold is opened, the driving plate moves the first block to the fourth position, rotates to the middle angle, and then falls back to the third position to close the mold and mold the second block. Step 3: After the mold is opened, the driving plate moves the first and second building blocks to the fourth position, rotates to the end angle, and then falls back to the third position. The mold is closed to mold the building block body. After the molding is completed, the block is demolded.
[0025] Preferably, it also includes a striker, which is disposed on the front mold. When the middle plate is in the third position and at the end angle, the striker can push the middle plate insert into the first cavity and the second cavity during mold closing, thereby enabling the joint body to be demolded smoothly.
[0026] Preferably, it also includes a limiting block, which can limit the retraction stroke of the middle plate insert when the firing pin pushes the middle plate insert out of the cavity.
[0027] Preferably, the retraction stroke is 0.5 to 2.0 mm.
[0028] Preferably, the retraction stroke is 0.6 to 1.9 mm.
[0029] Preferably, the retraction stroke is 0.7 to 1.8 mm.
[0030] Preferably, the retraction stroke is 0.8 to 1.7 mm.
[0031] Preferably, the retraction stroke is 0.9 to 1.6 mm.
[0032] Preferably, the retraction stroke is 1 to 1.5 mm.
[0033] Preferably, the retraction stroke is 1.1 to 1.4 mm.
[0034] Preferably, the retraction stroke is 1.2 to 1.3 mm.
[0035] Preferably, the middle plate is viewed from above as a triangular structure.
[0036] Preferably, the drive component is a hydraulic cylinder.
[0037] Preferably, the initial angle and the intermediate angle, and the intermediate angle and the end angle are all 120° apart.
[0038] Preferably, it further includes a top surface of the mold blank, on which a protrusion is disposed; When the middle plate is in the third position and at the initial angle or intermediate angle, the protrusion can lift the middle plate pin so that the end of the middle plate pin extends back into the cavity.
[0039] According to the present invention, a mold is provided, comprising the mold assembly described above or a joint body is molded using the joint body molding method described above.
[0040] Compared with the prior art, the present invention has the following beneficial effects: This invention, by setting a middle plate insert and a middle plate and making the middle plate a structure that can be raised, lowered and rotated, allows the three-color joint body to be molded with a single mold. Compared with the prior art, it has the advantages of simpler structure, lower cost and strong practicality. Attached Figure Description
[0041] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a structural diagram of the middle plate; Figure 2 This is a schematic diagram of the cavity structure; Figure 3 This is a schematic diagram of the connection between the middle plate insert and the fixing block; Figure 4 A schematic diagram of the structure where the center plate insert is located in the first position; Figure 5 This is a schematic diagram of the structure where the center plate pin is located in the second position; Figure 6 This is a schematic diagram of the top surface of the mold blank; Figure 7 This is a schematic diagram of the joint body. Figure 8 This is a schematic diagram of the structure of the first building block; Figure 9 A schematic diagram of the structure connecting the first building block to the second building block; Figure 10 Here are structural diagrams of the first and second slots; Figure 11 This is a schematic diagram of the structure of the intermediate column in Example 2; Figure 12 This is a schematic diagram of the structure of the middle column in Example 3, wherein the first building block has blind holes; Figure 13 This is a schematic diagram of the structure of the middle column in Example 3, wherein the second block has blind holes; Figure 14 This is a schematic diagram of the structure of the middle column in Example 1.
[0042] The diagram shows: Mold 1; Center plate inlaid pin 11; Firing pin 12; middle plate 13; First cavity 131; Second cavity 132; Limit block 14; Fixed block 15; Top surface of the mold blank: 16; Joint body 2; First building block 21; First pivot end 211; First intermediate section 212; First end 213; First slot 2131; Second building block 22; Second pivot end 221; Second intermediate section 222; Second end 223; Second slot 2231; 23 blocks; Intermediate column 231. Detailed Implementation
[0043] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.
[0044] Example 1: The present invention provides a joint body 2, including a first block 21, a second block 22 and a block body 23, wherein the block body (23) forms a rotating pair with at least one of the first block (21) and the second block (22), such that the block body 23 can be integrally formed on the first block 21 and the second block 22, and allows the first block 21 to rotate relative to the second block 22 without allowing the first block 21 and the second block 22 to detach from the block body 23.
[0045] like Figure 7 As shown, the block body 23 has a central pillar 231, and at least one of the first block 21 and the second block 22 has a hole structure. The central pillar 231 and the hole structure form a rotating pair, so that the block body 23 can be integrally formed on the first block 21 and the second block 22, and the central pillar 231 extends into the hole structure and allows the first block 21 to rotate relative to the second block 22, while not allowing the first block 21 and the second block 22 to detach from the block body 23.
[0046] In this embodiment, both the first building block 21 and the second building block 22 have hole structures, and all hole structures are through holes, such as... Figure 14 As shown, the intermediate column 231 passes through the through holes on the first block 21 and the second block 22, which makes the entire joint body 2 more stable.
[0047] Specifically, the first building block 21 and the second building block 22 respectively have a first slot 2131 and a second slot 2231, such as Figure 8 As shown, the first building block 21 includes a first pivot end 211, a first intermediate section 212, and a first end 213 connected in sequence, as follows: Figure 9 As shown, the second building block 22 includes a second pivot end 221, a second intermediate section 222, and a second end 223 connected in sequence. A first slot 2131 is disposed on the first end 213, and a second slot 2231 is disposed on the second end 223, as shown. Figure 10 As shown, the configuration of the first slot 2131 and the second slot 2231 is mainly used to fix the first block 21 and the second block 22 during molding, so as to prevent them from being thrown out by centrifugal force or falling off due to weight during the molding process, thereby increasing the safety of molding.
[0048] In this embodiment, the first end 213 is a ball-head structure and the second end 223 is a ball-head structure. They can form a rotational connection relationship by cooperating with the ball sockets of other parts to achieve a toy simulation effect and enhance the fun of the toy.
[0049] In this embodiment, both the first groove 2131 and the second groove 2231 are blind holes. The depth of the blind hole can be set to 0.5 to 1.5 mm. For example, the depth of the blind hole can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.
[0050] Furthermore, the cross-section of the blind hole can be set to a regular shape such as a circle, ellipse, D-shape, crescent shape, trapezoid, or regular polygon, or it can be an irregular shape. In this embodiment, the cross-section of the blind hole is set to a circle, and the diameter of the blind hole is 1.2 to 1.5 mm. For example, the diameter of the blind hole can be 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.
[0051] The present invention also provides a mold assembly for molding a joint body 2, including a middle plate insert 11, a middle plate 13, and a drive assembly, such as... Figure 1 , Figure 2 As shown, the middle plate 13 has a first cavity 131 and a second cavity 132. The first cavity 131 is used to form part or all of the first building block 21, and the second cavity 132 is used to form part or all of the second building block 22. The middle plate pin 11 can move between the first position and the second position.
[0052] Furthermore, when the middle plate insert 11 is in the first position, the end of the middle plate insert 11 extends into the first cavity 131 and / or the second cavity 132; when the middle plate insert 11 is in the second position, the middle plate insert 11 is outside the first cavity 131 and the second cavity 132. Specifically, the first position and the second position are two spaced positions along the axial direction of the middle plate insert 11. When the middle plate insert 11 extends to the first position and the end of the middle plate insert 11 extends into the first cavity 131, a first groove 2131 is formed on the first block 21 when the first block 21 is molded; when the end of the middle plate insert 11 extends into the second cavity 132, a second groove 2231 is formed on the second block 22 when the second block 22 is molded.
[0053] To injection mold the joint body 2 and reduce molding costs, this invention uses a single mold. Specifically, the joint body 2 is integrally molded using a sequential molding process, such as... Figure 1 , Figure 2 As shown, the drive assembly can drive the middle plate 13 to move between the third and fourth positions. Figure 1When the middle plate 13 is in the third position, the drive assembly can drive the middle plate 13 to move upward to leave the mold frame. When it moves to the fourth position, the middle plate 13 will not interfere with the mold frame when it rotates. That is, the middle plate 13 can rotate when it is in the fourth position. At this time, the drive assembly can drive the middle plate 13 to rotate between the initial angle, the middle angle and the end angle.
[0054] It should be noted that the distance between the third and fourth positions should be greater than the thickness of the middle plate 13. Preferably, the distance between the third and fourth positions is greater than 40 mm and ≤ 80 mm. If the middle plate 13 is too thick, it will increase the weight, which is detrimental to driving. The driving component is preferably a hydraulic cylinder, and the middle plate 13 is preferably triangular in plan view. The initial angle and the intermediate angle, as well as the intermediate angle and the end angle, are all 120° apart. When the middle plate 13 is in the third position and at the initial angle, the first block 21 can be molded. The molded first block 21 moves to the fourth position under the drive of the middle plate 13 and rotates 120° counterclockwise. At this point, the middle plate 13 reaches the intermediate angle. Then, the driving component drives the middle plate 13 down to the third position, i.e., the middle plate 13 is in the third position and at the intermediate angle, at which point the second block 22 can be molded. After the second block 22 is molded, the first block 21 and the second block 22 move to the fourth position and rotate 120° counterclockwise under the drive of the middle plate 13. At this time, the middle plate 13 reaches the end angle. Then the drive component drives the middle plate 13 to descend to the third position, that is, the middle plate 13 is in the third position and at the end angle. At this time, the molded block body 23 is formed.
[0055] Specifically, when the molded first block 21 rotates with the middle plate 13 from the initial angle to the middle angle, the end of the middle plate pin 11 extends into the first cavity 131; when the molded first block 21 and second block 22 rotate with the middle plate 13 from the middle angle to the end angle, the end of the middle plate pin 11 extends into the first cavity 131 and the second cavity 132.
[0056] The present invention also provides a method for molding a joint body, which uses a mold assembly for molding and includes the following steps: Step 1: Control the middle plate 13 to be in the third position and at the initial angle, and mold the first block 21. Step 2: After the mold is opened, drive the middle plate 13 to move the first block 21 to the fourth position, then rotate it to the middle angle and then fall back to the third position, and close the mold to mold the second block 22; Step 3: After the mold is opened, the driving plate 13 drives the first block 21 and the second block 22 to move to the fourth position, then rotates to the end angle and falls back to the third position. The mold is closed to mold the block body 23. After the molding is completed, the block is demolded.
[0057] like Figure 5As shown, it also includes a striker 12, which is disposed on the front mold. When the middle plate 13 is in the third position and at the end angle, the striker 12 can push the middle plate insert 11 out of the first cavity 131 and the second cavity 132 during mold closing, thereby enabling the joint body 2 to be smoothly demolded after molding. Specifically, the striker 12 pushes the middle plate insert 11 to move through four holes.
[0058] like Figure 3 , Figure 4 , Figure 5 As shown, it also includes a limiting block 14, and a fixing block 15 is connected to the bottom of the middle plate insert 11. Preferably, the fixing block 15 is detachably connected to the middle plate insert 11 by screws. When the striking pin 12 pushes the middle plate insert 11 away from the cavity, the middle plate insert 11 and the fixing block 15 move synchronously. The limiting block 14 can limit the retraction stroke of the middle plate insert 11. Figure 4 The middle plate pin 11 is in the first position. Figure 5 The middle plate inlay pin 11 is in the second position.
[0059] During the molding process, the retracted center plate insert 11 is positioned and fixed by the cooperation of the fixing block 15 and the limiting block 14 to prevent the center plate insert 11 from falling off due to rotational inertia or gravity, thus ensuring the stability of the center plate insert 11 in different positions.
[0060] Specifically, such as Figure 4 As shown, the retraction stroke is represented by L, which can be 1 to 2.0 mm. For example, L can take values of 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc.
[0061] like Figure 6 As shown, it also includes a mold blank top surface 16, on which a protrusion is provided. When the middle plate 13 is in the third position and at the initial angle or intermediate angle, the protrusion can lift the middle plate insert 11, thereby allowing the end of the middle plate insert 11 to extend into the cavity again, preparing for the injection molding of the toy.
[0062] The present invention also provides a mold 1, including a mold assembly, which enables the joint body 2 to be molded on a single mold 1, thereby reducing the number of molds 1 and lowering the molding cost.
[0063] Example 2: The difference between this embodiment and embodiment 1 is that the first groove 2131 is disposed on the first intermediate section 212, the second groove 2231 is disposed on the second intermediate section 222, the first end 213 is a ball-and-socket structure, and the second end 223 is a ball-and-socket structure.
[0064] In this embodiment, both the first block 21 and the second block 22 have hole structures, and both are blind holes. The intermediate column 231 is divided into two sections, one extending into the blind hole penetrating the first block 21, and the other extending into the blind hole in the second block 22. Figure 11 As shown.
[0065] Example 3: This embodiment differs from Embodiment 1 in that the first building block 21 or the second building block 22 has a hole structure, which are blind holes, and the intermediate column 231 extends into the blind hole on the first building block 21 or the second building block 22, such as... Figure 12 , Figure 13 As shown, the first block 21 and the second block 22 have matching concave and convex structures that prevent the first block 21 and the second block 22 from leaving the block body 23, and the first block 21 and the second block 22 can be stably held on the block body 23.
[0066] It should be noted that the concave-convex structure can take many forms, such as groove boss structure, or hole column structure, etc., which can be flexibly selected according to the actual scenario to meet the needs of the actual scenario.
[0067] Example 4: The difference between this embodiment and embodiment 1 is that the first block 21 has a first groove 2131, while the second groove 2231 on the second block 22 is omitted, which can still achieve the effect of the present invention.
[0068] Specifically, after the first block 21 is molded, the first block 21 can be rotated with the middle plate 13 by the cooperation of the first groove 2131 and the middle plate pin 11. After the second block 22 is molded, the second block 22 can rotate with the first block 21 along with the middle plate 13 by means of the connection relationship with the first block 21, so as to achieve stability in the molding process.
[0069] In this embodiment, the connection between the first building blocks 21 can adopt a mating structure with concave and convex fittings, such as a structure in which grooves and platforms fit together, so that they can rotate relative to each other and can be inseparable in the radial direction.
[0070] Example 5: The difference between this embodiment and embodiment 1 is that the hole structure is configured on the building block 23, and at least one of the first building block 21 and the second building block 22 has an intermediate pillar 231, which can also achieve the effect of the present invention.
[0071] The working principle of this invention is as follows: First, adjust the middle plate 13 to the third position and the initial angle, and adjust the middle plate pin 11 to the first position. At this time, the first block 21 is molded by closing the mold.
[0072] Next, the control drive component drives the middle plate 13 to move the molded first block 21 to the fourth position and rotate it counterclockwise by 120°. At this time, the middle plate 13 rotates to the middle angle. Then the drive component drives the middle plate 13 to descend to the third position, that is, the middle plate 13 is in the third position and at the middle angle. At this time, the mold is closed to mold the second block 22.
[0073] Next, after the second block 22 is molded, the control drive component drives the middle plate 13 to move the molded first block 21 and second block 22 to the fourth position and rotate 120° counterclockwise. At this time, the middle plate 13 reaches the end angle. Then the drive component drives the middle plate 13 to descend to the third position, that is, the middle plate 13 is in the third position and at the end angle. At this time, the mold is closed, and the ejector pin 12 pushes the middle plate insert pin 11 out of the first cavity 131 and the second cavity 132. Then the glue is injected. When the mold is closed, the ejector pin 12 will drill into the hole to ensure the accuracy of injection molding and mold the block body 23.
[0074] Finally, after the block 23 has been molded and cured, the joint 2 is demolded.
[0075] The present invention, through the above working principle, enables cyclical production using a single mold and an injection molding machine, greatly saving costs.
[0076] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0077] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.
Claims
1. A joint body, characterized in that, It includes the first block (21), the second block (22), and the block body (23); The building block (23) forms a revolute joint with at least one of the first building block (21) and the second building block (22), such that the building block (23) can be integrally formed on the first building block (21) and the second building block (22), and allows the first building block (21) to rotate relative to the second building block (22) without allowing the first building block (21) and the second building block (22) to detach from the building block (23), wherein: The first block (21) has a first slot (2131).
2. The joint body according to claim 1, characterized in that, The building block (23) has a central column (231), at least one of the first building block (21) and the second building block (22) has a hole structure or the building block (23) has a hole structure, at least one of the first building block (21) and the second building block (22) has a central column (231), the hole structure and the central column (231) form the rotating pair, and the central column (231) extends into the hole structure.
3. The joint body according to claim 1, characterized in that, The second building block (22) has a second groove (2231). Preferably, the first building block (21) includes a first pivot end (211), a first intermediate section (212), and a first end (213) connected in sequence, and the second building block (22) includes a second pivot end (221), a second intermediate section (222), and a second end (223) connected in sequence. Preferably, the first groove (2131) is disposed on the first intermediate section (212) or the first end (213). Preferably, the second groove (2231) is disposed on the second intermediate section (222) or the second end (223). Preferably, the first end (213) is a ball-head or ball-and-socket structure, and the second end (223) is a ball-head or ball-and-socket structure. Preferably, both the first groove (2131) and the second groove (2231) are blind holes. Preferably, the depth of the blind hole is 0.5 to 1.5 mm. Preferably, the depth of the blind hole is 0.6–1.4 mm. Preferably, the depth of the blind hole is 0.7–1.3 mm. Preferably, the depth of the blind hole is 0.8–1.2 mm. Preferably, the depth of the blind hole is 0.9–1.1 mm. Preferably, the cross-section of the blind hole is circular, elliptical, D-shaped, crescent-shaped, trapezoidal, or regular polygonal. Preferably, the cross-section of the blind hole is circular, and the diameter of the blind hole is 1.2–1.5 mm. Preferably, the diameter of the blind hole is 1.3–1.4 mm.
4. The joint body according to claim 2, characterized in that, The hole structure on the first block (21) and the second block (22) adopts any of the following structures: Both the first block (21) and the second block (22) have hole structures and are through holes. The intermediate column (231) passes through the through holes on the first block (21) and the second block (22). Both the first block (21) and the second block (22) have hole structures and are blind holes. The intermediate column (231) is divided into two sections, one section extending into the blind hole penetrating the first block (21) and the other section extending into the blind hole on the second block (22). The first block (21) or the second block (22) has a hole structure and is a blind hole. The intermediate column (231) extends into the blind hole on the first block (21) or the second block (22). The first block (21) and the second block (22) have a matching concave-convex structure that prevents the first block (21) and the second block (22) from leaving the block body (23).
5. A mold assembly, characterized in that, For molding the joint body according to any one of claims 1 to 4, comprising a middle plate insert (11), a middle plate (13), and a drive assembly; The middle plate (13) has a first cavity (131) and a second cavity (132). The first cavity (131) is used to form part or all of the first building block (21), and the second cavity (132) is used to form part or all of the second building block (22). The middle plate pin (11) is movable between a first position and a second position. When the middle plate pin (11) is in the first position, the end of the middle plate pin (11) extends into the first cavity (131) and / or the second cavity (132). When the middle plate pin (11) is in the second position, the middle plate pin (11) is outside the first cavity (131) and the second cavity (132). The drive assembly is capable of driving the middle plate (13) to move between the third position and the fourth position and is capable of driving the middle plate (13) to rotate between the initial angle, the intermediate angle and the end angle when the middle plate (13) is in the fourth position.
6. A method for molding a joint body, characterized in that, Molding using the mold assembly of claim 5 includes the following steps: Step 1: Control the middle plate (13) to the third position and at the initial angle, and mold the first block (21) together. Step 2: After the mold is opened, the driving plate (13) drives the first block (21) to move to the fourth position, rotates to the middle angle, and then falls back to the third position to mold the second block (22). Step 3: After the mold is opened, the driving plate (13) drives the first block (21) and the second block (22) to move to the fourth position, rotate to the end angle, and then fall back to the third position. The mold is closed to mold the block body (23). After the molding is completed, the block is demolded.
7. The molding assembly according to claim 5 or the molding method for the joint body according to claim 6, characterized in that, The system also includes a striker (12) disposed on the front mold. When the middle plate (13) is in the third position and at the end angle, the striker (12) can push the middle plate insert (11) out of the first cavity (131) and the second cavity (132) during mold closing, thereby allowing the joint body to be demolded smoothly. Preferably, the system also includes a limiting block (14), which can limit the retraction stroke of the middle plate insert (11) when the striker (12) pushes the middle plate insert (11) out of the cavity. Preferably, the retraction stroke is 0.5-2.0 mm. Preferably, the retraction stroke is 0.6-1.9 mm. Preferably, the retraction stroke is 0.7-1.8 mm. Preferably, the retraction stroke is 0.8-1.7 mm. Preferably, the retraction stroke is 0.9-1.6 mm. Preferably, the retraction distance is 1–1.5 mm. Preferably, the retraction distance is 1.1–1.4 mm. Preferably, the retraction distance is 1.2–1.3 mm.
8. The molding assembly according to claim 5 or the molding method for the joint body according to claim 6, characterized in that, The middle plate (13) is viewed from above as a triangular structure. Preferably, the drive assembly is preferably a hydraulic cylinder. Preferably, the initial angle and the intermediate angle, and the intermediate angle and the end angle are all 120° apart.
9. The molding assembly according to claim 5 or the molding method for the joint body according to claim 6, characterized in that, It also includes a top surface (16) of the mold blank, on which a protrusion is provided; When the middle plate (13) is in the third position and at the initial angle or intermediate angle, the protrusion can lift the middle plate pin (11) so that the end of the middle plate pin (11) extends back into the cavity.
10. A mold, characterized in that, The joint body is molded using any one of claims 5, 7, 8, and 9, or by any one of the joint body molding methods described in any one of claims 6 to 9.