A cold pressing equipment for polyvinyl chloride rubber material

Abstract

The invention provides a cold-pressing equipment for polyvinyl chloride rubber materials applied in the field of cold-pressing equipment, comprising a frame and a cold-pressing mold arranged on the frame, the frame being provided with four groups of sliding bars, the sliding bars being slidably connected with a lifting platform, a demoulding cylinder being fixed between the tops of the four groups of sliding bars, the output end of the demoulding cylinder being fixedly connected with the top of the lifting platform, and the cold-pressing cylinder being also fixed on the lifting platform; the cold-pressing mold comprising a lower mold, the top of which is provided with two groups of symmetrically arranged upper molds and a group of side moving blocks, the cold-pressing mold further comprising a mold core column and a cold-pressing plate; the application can realize automatic mold closing and cold-pressing action of a cable junction box by utilizing the step-by-step downward movement of the mold core column and the cold-pressing plate during the mold closing process of the lower mold, the demoulding convenience of the cable junction box is high, the production efficiency of the cable junction box can be effectively improved, the application has market prospects, and is suitable for popularization and application.

Description

Technical Field

[0001] The present application relates to the field of cold pressing equipment, and in particular to a cold pressing equipment for polyvinyl chloride rubber materials. Background Art

[0002] Cable junction boxes are key components for connecting and protecting cables in power systems, and their quality directly affects the reliability and safety of power transmission. With the rapid development of the power industry, the demand for cable junction boxes continues to increase, and the performance requirements are also getting higher and higher. Among them, cable junction boxes prepared by cold pressing of polyvinyl chloride rubber materials have a tighter molecular structure due to cold pressing, which enhances the mechanical strength of the product. Compared with hot pressing, the internal stress of cold pressed products is smaller, which reduces the risk of cracking caused by stress concentration and improves the reliability and service life of the product.

[0003] Existing Figure 4 The three-way cable junction box shown has three groups of through holes, which makes demoulding difficult in the cold pressing equipment, affecting the cold pressing production efficiency. Therefore, a cold pressing equipment for polyvinyl chloride rubber materials is proposed. Summary of the invention

[0004] The purpose of the present application is to solve the technical problem that the existing three-way cable junction box is difficult to demould by cold pressing. Compared with the existing technology, a cold pressing device for polyvinyl chloride rubber material is provided, including a frame and a cold pressing mold arranged on the frame, the frame is provided with four groups of sliding rods, the sliding rods are slidably connected with a lifting platform, a demoulding cylinder is fixed between the tops of the four groups of sliding rods, the output end of the demoulding cylinder is fixedly connected to the top of the lifting platform, and a cold pressing cylinder is also fixed on the lifting platform;

[0005] The cold pressing mold comprises a lower mold, and two groups of symmetrically arranged upper molds and a group of side blocks are arranged on the top of the lower mold. The cold pressing mold also comprises a mold core column and a cold pressing plate. The lower mold is aligned with the upper mold and the side blocks, and the mold core column moves downward to form a cavity corresponding to the cable junction box. The cold pressing plate is used to pressurize the polyvinyl chloride powder filled in the cavity.

[0006] The demoulding oil cylinder is used to drive the mold core column to move downward, and the cold pressing oil cylinder is used to drive the cold pressing plate to move downward.

[0007] Furthermore, the cable junction box is an open box structure, and two groups of coaxially arranged main line tubes are symmetrically provided on both sides of the cable junction box. The cable junction box is also provided with side line tubes perpendicular to the axis of the main line tubes, and a reserved seat is also provided at the connection node between the inner side of the cable junction box and the reserved seat.

[0008] Furthermore, the top of the lower mold is provided with a lower groove corresponding to the outer contour of the lower half of the box body of the cable junction box, and the top of the lower mold is also provided with a lower main groove corresponding to the outer contour of the lower half of the main line tube and a lower side tube groove corresponding to the outer contour of the lower half of the side line tube;

[0009] Two groups of symmetrically arranged upper molds are provided at the bottom of the upper mold, and a second slide groove matching the upper mold is provided at the top of the lower mold. The two groups of upper molds are relatively slidably connected to the top of the lower mold. An upper mold is provided with an upper groove corresponding to the outer contour of the upper half of the box body of the cable junction box. The bottom of the upper mold is also provided with an upper main pipe groove corresponding to the outer contour of the upper half of the main line pipe and an upper side pipe groove corresponding to the outer contour of the upper half of the side line pipe.

[0010] Furthermore, a first slide groove is provided at the bottom of the side moving block, and a first slide rail matching the first slide groove is provided on one side of the lower mold. The side moving block is slidably connected to the lower mold along the axial direction of the lower side tube groove through the first slide rail. Side core rods are fixed to the bottom of the side moving block and the upper mold. The side core rod on the upper mold is coaxially arranged with the lower main tube groove, and the side core rod on the side moving block is coaxially arranged with the lower side tube groove.

[0011] Furthermore, the side core rods are sleeved with port sealing rings, one side of the port sealing ring is fixed with a side pressure ring, the side pressure ring is coaxially arranged with the side core rod, the inner diameter of the side pressure ring is equal to the outer diameter of the side core rod, the outer diameter of the side pressure ring is equal to the outer diameter of the lower main pipe groove, and the outer diameters of the lower main pipe groove and the lower side pipe groove are equal;

[0012] A side pressure groove is provided on the side of the port sealing ring away from the limit pin, a limit pin is also fixed on the side of the port sealing ring opposite to the lower mold, and a limit hole corresponding to the limit pin is provided on the upper mold and the side positioning block;

[0013] A tension spring is sleeved on the side pressure ring, and the tension spring has an elastic force that drives the port sealing ring away from the lower mold.

[0014] Furthermore, the top of the mold core column is fixedly connected to the bottom of the lifting platform, and the output end of the cold pressing cylinder is fixedly connected to the top of the cold pressing plate.

[0015] Furthermore, a mold core corresponding to the inner contour of the cable junction box is provided at the bottom of the mold core column, the end of the side core rod is a ball head structure, a docking ball groove corresponding to the end of the side core rod is provided on the mold core, and reserved grooves matching the reserved seats are also provided on both sides of the mold core;

[0016] A main pressing frame is fixed at the bottom of the cold pressing plate, the bottom contour of the main pressing frame corresponds to the top contour of the cable junction box, a core groove matching the core column is provided in the main pressing frame, and the core column is slidably connected in the core groove.

[0017] Furthermore, a mold closing gantry is fixed on one side of the mold core column, two groups of symmetrically arranged active wedges are provided at the bottom of the mold closing gantry, and a first mold closing groove corresponding to the active wedges is provided at the top of one side of the upper mold;

[0018] A passive wedge block is arranged on the top of the other side of the upper mold, and a second mold closing groove corresponding to the passive wedge block is arranged on the top of the side positioning block.

[0019] Furthermore, a return spring is clamped between the upper mold, the side block and the lower mold, and the return spring has an elastic force to drive the upper mold and the side block away from the lower mold.

[0020] Furthermore, three groups of side pressure plates arranged in a herringbone shape are provided at the bottom of the cold-pressed plate, and side pressure wedge blocks corresponding to the side pressure grooves are provided at the bottom of the side pressure plates.

[0021] Compared with the prior art, the advantages of this application are:

[0022] The present application, through the cooperation between the upper mold with the port sealing ring and the side core rod and the side positioning block, can realize automatic mold closing and cold pressing of the cable junction box by utilizing the step-by-step downward movement of the mold core column and the cold pressing plate during the mold closing process of the lower mold. The cable junction box is easy to demould and can effectively improve the production efficiency of the cable junction box. At the same time, the pressure in the cavity of the cold pressing mold is evenly distributed, which can ensure the stable quality of the product, reduce the scrap rate, and reduce the production cost. It has market prospects and is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of this application;

[0024] Figure 2 This is a schematic diagram of the front structure of the cold pressing die proposed in this application;

[0025] Figure 3 This is a schematic diagram of the back structure of the cold pressing mold proposed in this application;

[0026] Figure 4 This is a schematic diagram of the structure of the cable junction box proposed in this application;

[0027] Figure 5 This is a schematic diagram of the explosion structure of the cold pressing die proposed in this application;

[0028] Figure 6 It is a structural schematic diagram of the upper mold and the lower mold proposed in this application;

[0029] Figure 7 It is a schematic diagram of the explosion structure of the upper mold and the lower mold proposed in this application;

[0030] Figure 8 It is a schematic diagram of the top structure of the mold core column and the cold press plate proposed in this application;

[0031] Fig. 9 It is a schematic diagram of the bottom structure of the mold core column and the cold press plate proposed in this application;

[0032] Fig.10 It is a schematic diagram of the mold closing and mold removal states of the upper mold and the lower mold proposed in this application;

[0033] Fig.11 This is a schematic diagram of the bottom structure of the upper mold proposed in this application;

[0034] Fig.12 This is a schematic diagram of the structure of the port sealing ring proposed in this application;

[0035] Fig.13 It is a schematic diagram of the cross-sectional structure of the cold pressing die proposed in this application;

[0036] Fig.14 It is a schematic diagram of the state of the cold pressing mold proposed in this application when the mold is separated;

[0037] Fig.15 It is a schematic diagram of the state when the mold core column proposed in this application moves downward;

[0038] Fig.16 This is a schematic diagram of the state of the cold pressing plate proposed in this application when it moves downward.

[0039] Description of the numbers in the figure:

[0040] 1. Rack; 11. Slide bar; 12. Lifting platform; 13. Demolding cylinder; 14. Cold pressing cylinder; 2. Cold pressing mold; 201. Lower mold groove; 202. Upper mold groove; 203. Upper main pipe groove; 204. Upper side pipe groove; 205. Lower main pipe groove; 206. Lower side pipe groove; 21. Lower mold; 211. First slide rail; 212. Second slide rail; 22. Upper mold; 221. First mold groove; 222. Passive wedge; 223. Second slide rail; 23. Core column; 231. Core; 232. Docking ball groove; 233, reserved groove; 24, cold press plate; 241, side pressure plate; 2411, side pressure wedge block; 242, core groove; 243, main pressure frame; 25, side positioning block; 251, second mold clamping groove; 252, first slide groove; 26, mold clamping gantry; 261, active wedge block; 3, cable junction box; 31, main line pipe; 32, side line pipe; 33, reserved seat; 4, port sealing ring; 41, limit pin; 42, side pressure ring; 43, tensioning spring; 44, side pressure groove; 5, side core rod. DETAILED DESCRIPTION

[0041] The embodiments will be combined with the drawings in the specification to clearly and completely describe the technical solution of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present application. Example

[0042] The present invention provides a cold pressing device for polyvinyl chloride rubber material, which is mainly used for cold pressing of cable junction box 3. For details, please refer to Figure 4 The cable junction box 3 is an open box structure. Two groups of coaxially arranged main line tubes 31 are symmetrically arranged on both sides of the cable junction box 3. The cable junction box 3 is also provided with a side line tube 32 perpendicular to the axis of the main line tube 31. A reserved seat 33 is also provided at the connection node between the inner side of the cable junction box 3 and the reserved seat 33. The reserved seat 33 is used for the bolt installation connection of the box cover plate in the later stage.

[0043] Please refer to 1- Fig.16 , including a frame 1 and a cold pressing mold 2 arranged on the frame 1, the frame 1 is provided with four groups of sliding rods 11, the sliding rods 11 are slidably connected with a lifting platform 12, a demoulding cylinder 13 is fixed between the tops of the four groups of sliding rods 11, the output end of the demoulding cylinder 13 is fixedly connected to the top of the lifting platform 12, and a cold pressing cylinder 14 is also fixed on the lifting platform 12, wherein the demoulding cylinder 13 and the cold pressing cylinder 14 are both equipped with high-precision pressure sensors and displacement sensors, which can monitor the pressure and stroke in real time to ensure the accuracy and stability of pressure control, wherein the accuracy of the pressure sensor is ±0.1%, and the resolution of the displacement sensor is 0.01 mm, so as to realize precise control of the pressure and displacement during the cold pressing process;

[0044] The cold pressing mold 2 includes a lower mold 21, and two groups of symmetrically arranged upper molds 22 and a group of side blocks 25 are arranged on the top of the lower mold 21. The cold pressing mold 2 also includes a mold core column 23 and a cold pressing plate 24. The lower mold 21 is aligned with the upper mold 22 and the side blocks 25, and the mold core column 23 moves downward to form a cavity corresponding to the cable junction box 3. The cold pressing plate 24 is used to pressurize the polyvinyl chloride powder filled in the cavity. Furthermore, the cold pressing mold 2 is made of alloy steel as a whole. The cavity of the cold pressing mold 2 is processed by a CNC machining center with a machining accuracy of ±0.01 mm. The surface of the cavity is polished and hard chrome-plated to improve the surface hardness and smoothness and reduce the surface roughness of the product.

[0045] The demoulding cylinder 13 is used to drive the mold core column 23 to move downward, and the cold pressing cylinder 14 is used to drive the cold pressing plate 24 to move downward.

[0046] For details, please refer to Figure 4 - Fig.11 The top of the lower mold 21 is provided with a lower groove 201 corresponding to the outer contour of the lower half of the box body of the cable junction box 3, and the top of the lower mold 21 is also provided with a lower main groove 205 corresponding to the outer contour of the lower half of the main line tube 31 and a lower side tube groove 206 corresponding to the outer contour of the lower half of the side line tube 32;

[0047] Two groups of symmetrically arranged upper molds 22 are provided at the bottom of the upper mold 22, and a second slide groove 212 matching the upper mold 22 is provided at the top of the lower mold 21. The two groups of upper molds 22 are relatively slidably connected to the top of the lower mold 21. An upper mold 202 corresponding to the outer contour of the upper half of the box body of the cable junction box 3 is provided in the upper mold 22. An upper main pipe groove 203 corresponding to the outer contour of the upper half of the main line pipe 31 and an upper side pipe groove 204 corresponding to the outer contour of the upper half of the side line pipe 32 are also provided at the bottom of the upper mold 22.

[0048] In order to facilitate the demoulding of the cold-pressed cable junction box 3 from the cavity of the cold-pressing mold 2, two sets of upper molds 22 are connected to the top of the lower mold 21 in a relatively horizontal sliding manner. When the two sets of upper molds 22 are matched, the second slide groove 212 and the second slide rail 223 are used to provide mold clamping pressure for the upper mold 22 and the lower mold 21. At this time, the lower groove 201 is matched with the upper groove 202, the upper main groove 203 is matched with the lower main groove 205, and the lower side groove 206 is matched with the upper side groove 204 to form a complete contour corresponding to the outside of the cable junction box 3. In order to prevent the lower mold 21 and the upper mold 22 from generating a gap, a groove structure is set at the parting surface of the lower mold 21 and the upper mold 22, and a sealing strip is installed in the groove to prevent the polyvinyl chloride rubber material from entering the mold gap during the cold pressing process. The sealing strip is made of high-pressure resistant silicone rubber material to ensure that it will not be deformed or damaged during the cold pressing process.

[0049] For further information, see 7 and Fig.11 A first slide groove 252 is provided at the bottom of the side moving block 25, and a first slide rail 211 matching the first slide groove 252 is provided on one side of the lower mold 21. The side moving block 25 is slidably connected to the lower mold 21 along the axial direction of the lower side tube groove 206 through the first slide rail 211. A side core rod 5 is fixed to the bottom of the side moving block 25 and the upper mold 22. The side core rod 5 on the upper mold 22 is coaxially arranged with the lower main tube groove 205, and the side core rod 5 on the side moving block 25 is coaxially arranged with the lower side tube groove 206. A mold core 231 corresponding to the inner contour of the box body of the cable junction box 3 is provided at the bottom of the mold core column 23.

[0050] By the displacement of the upper mold 22 and the side positioning block 25 towards the lower mold 21, the side core rod 5 is extended into the lower mold 21, and cooperates with the downward movement of the mold core column 23, thereby forming a complete cavity between the lower mold 21 and the upper mold 22. When the upper mold 22 and the side positioning block 25 are away from the lower mold 21, the side core rod 5 is withdrawn from the main line tube 31 or the side line tube 32 of the cable junction box 3, thereby not affecting the demolding operation of the cable junction box 3.

[0051] See also Fig.11 - Fig.12 , the side core rods 5 are sleeved with port sealing rings 4, and a side pressure ring 42 is fixed on one side of the port sealing ring 4. The side pressure ring 42 is coaxially arranged with the side core rod 5. The side pressure ring 42 can block the port parts of the main line tube 31 and the side line tube 32 in the cavity through the axial movement of the side pressure ring 42 along the side core rod 5. At the same time, the port sealing ring 4 is squeezed by external force to make the side pressure ring 42 move close to the lower mold 21, and the port parts of the main line tube 31 and the side line tube 32 of the side pressure ring 42 can be auxiliary squeezed to improve the cold pressing strength of the main line tube 31 and the side line tube 32. The inner diameter of the side pressure ring 42 is equal to the outer diameter of the side core rod 5, and the outer diameter of the side pressure ring 42 is equal to the outer diameter of the lower main pipe groove 205. The outer diameter of the lower main pipe groove 205 is equal to the outer diameter of the lower side pipe groove 206;

[0052] For details, please refer to Figure 8 - Fig. 9 The top of the mold core column 23 is fixedly connected to the bottom of the lifting platform 12, the output end of the cold pressing oil cylinder 14 is fixedly connected to the top of the cold pressing plate 24, the end of the side core rod 5 is a ball head structure, and the mold core 231 is provided with a docking ball groove 232 corresponding to the end of the side core rod 5. When the side core rod 5 is close to the lower mold 21, it is matched with the docking ball groove 232 on the mold core 231, which can effectively prevent the side core rod 5 from being deformed during the cold pressing process, and avoid the main line tube 31 and the side line tube 32 of the cable junction box 3 from cold pressing quality defects. Both sides of the mold core 231 are also provided with reserved grooves 233 matching the reserved seat 33;

[0053] A main pressing frame 243 is fixed to the bottom of the cold pressing plate 24 , and the bottom contour of the main pressing frame 243 corresponds to the top contour of the cable junction box 3 . A core groove 242 matching the core column 23 is provided in the main pressing frame 243 , and the core column 23 is slidably connected in the core groove 242 .

[0054] See also Figure 7 - Fig.16 In the specific cold pressing process, before the upper mold 22 and the side block 25 move close to the lower mold 21, part of the polyvinyl chloride powder is pre-filled in the lower mold groove 201. At this time, when the demoulding cylinder 13 drives the mold core column 23 to move downward to form a complete cavity in the cold pressing mold 2, the downward movement of the mold core column 23 can pre-press the polyvinyl chloride powder in the lower mold groove 201. When the complete cavity is formed, the top opening of the cavity is filled with a designed amount of polyvinyl chloride powder for the second time. At this time, the cold pressing cylinder 14 drives the cold pressing plate 24 to drive the main pressing frame 243 to move downward, so that the main pressing frame 243 is aligned with the top opening of the cavity. Under the continuous pressure of the cold pressing cylinder 14, the main pressing frame 243 cold-presses the polyvinyl chloride powder in the cavity and forms a complete cable junction box 3 in the cavity.

[0055] For further information, see Figure 6 - Fig. 9 A mold closing door frame 26 is fixed to one side of the mold core column 23, and two groups of symmetrically arranged active wedge blocks 261 are provided at the bottom of the mold closing door frame 26. A first mold closing groove 221 corresponding to the active wedge block 261 is provided at the top of one side of the upper mold 22, and a passive wedge block 222 is provided at the top of the other side of the upper mold 22. A second mold closing groove 251 corresponding to the passive wedge block 222 is provided at the top of the side position block 25. It should be noted that a return spring is clamped between the upper mold 22, the side position block 25 and the lower mold 21, and the return spring has an elastic force to drive the upper mold 22 and the side position block 25 away from the lower mold 21.

[0056] When the mold core column 23 moves downward, the active wedge block 261 cooperates with the first mold-closing groove 221 to drive the two groups of upper molds 22 to overcome the elastic force of the return spring and approach each other, so that the upper mold 22 automatically forms a mold-closing action, and the mold-closing door frame 26 is used to provide auxiliary mold-closing pressure for the upper mold 22. At the same time, when the upper mold 22 undergoes a relative displacement, the passive wedge block 222 cooperates with the second mold-closing groove 251 to drive the side moving block 25 to overcome the elastic force of the return spring and approach the lower mold 21, and the squeezing force of the upper mold 22 on the side moving block 25 and the vertical limiting force of the first mold-closing groove 221 and the first slide groove 252 are used to provide the side moving block 25 with mold-closing pressure. Similarly, when the mold core column 23 moves upward for mold separation, the upper mold 22 and the side moving block 25 are automatically reset by the return springs.

[0057] For further information, see Figure 5 - Fig.12The bottom of the cold pressing plate 24 is also provided with three groups of side pressure plates 241 arranged in a herringbone shape. The connection strength between the side pressure plate 241 and the cold pressing plate 24 is strengthened by a reinforcing plate to prevent the side pressure plate 241 from deforming under pressure. The bottom of the side pressure plate 241 is provided with a side pressure wedge block 2411 corresponding to the side pressure groove 44. The side of the port sealing ring 4 away from the limiting pin 41 is provided with a side pressure groove 44. The side of the port sealing ring 4 opposite to the lower mold 21 is also fixed with a limiting pin 41. The upper mold 22 and the side positioning block 25 are both provided with limiting holes corresponding to the limiting pin 41; a tensioning spring 43 is sleeved on the side pressure ring 42, and the tensioning spring 43 has an elastic force to drive the port sealing ring 4 away from the lower mold 21.

[0058] When the cold pressing plate 24 moves downward for cold pressing, on the one hand, the main pressing frame 243 is used to provide vertical pressure for the polyvinyl chloride powder in the cavity. On the other hand, the cold pressing plate 24 is used to drive the side pressing plate 241 to move downward, so that the side pressure wedge block 2411 cooperates with the side pressure groove 44 on the port sealing ring 4, so that the port sealing ring 4 as a whole overcomes the elastic force of the tensioning spring 43 and approaches the lower mold 21. The side pressure ring 42 is used to move axially along the side core rod 5 to provide horizontal pressure for the polyvinyl chloride powder in the cavity, thereby realizing the cold pressing molding operation with multiple pressure sources. By changing the pressure transmission structure, it is ensured that the pressure is evenly transmitted to various parts of the cavity during the cold pressing process, thereby improving the molding accuracy and structural strength.

[0059] The present application, through the cooperation between the upper mold 22 with the port sealing ring 4 and the side core rod 5 and the side sliding block 25, can realize automatic mold closing and cold pressing of the cable junction box 3 by utilizing the step-by-step downward movement of the mold core column 23 and the cold pressing plate 24 during the mold closing process of the lower mold 21. The cable junction box 3 is easy to demould, which can effectively improve the production efficiency of the cable junction box 3. At the same time, the pressure in the cavity of the cold pressing mold 2 is evenly distributed, which can ensure the stable quality of the product, reduce the scrap rate, and reduce the production cost. It has market prospects and is suitable for promotion and application.

[0060] The above is only the best implementation method adopted by this application in combination with current actual needs, but the protection scope of this application is not limited to this.

Claims

1. A cold pressing device for polyvinyl chloride rubber material, comprising a frame (1) and a cold pressing mold (2) arranged on the frame (1), characterized in that: The frame (1) is provided with four groups of sliding rods (11), and a lifting platform (12) is slidably connected to the sliding rods (11). A demoulding cylinder (13) is fixed between the tops of the four groups of sliding rods (11), and the output end of the demoulding cylinder (13) is fixedly connected to the top of the lifting platform (12). A cold pressing cylinder (14) is also fixed on the lifting platform (12); The cold pressing mold (2) comprises a lower mold (21), and two groups of symmetrically arranged upper molds (22) and a group of side blocks (25) are provided on the top of the lower mold (21). The cold pressing mold (2) also comprises a mold core column (23) and a cold pressing plate (24). The lower mold (21) is combined with the upper mold (22) and the side blocks (25) to cooperate with the mold core column (23) to move downward to form a cavity corresponding to the cable junction box (3). The cold pressing plate (24) is used to pressurize the polyvinyl chloride powder filled in the cavity. The demoulding cylinder (13) is used to drive the mold core column (23) to move downward, and the cold pressing cylinder (14) is used to drive the cold pressing plate (24) to move downward; The cable junction box (3) is an open box structure, two groups of coaxially arranged main line tubes (31) are symmetrically provided on both sides of the cable junction box (3), a side line tube (32) perpendicular to the axis of the main line tube (31) is also provided on the cable junction box (3), and a reserved seat (33) is also provided at the connection node between the inner side of the cable junction box (3) and the reserved seat (33); The top of the lower mold (21) is provided with a lower groove (201) corresponding to the outer contour of the lower half of the box body of the cable junction box (3); the top of the lower mold (21) is also provided with a lower main pipe groove (205) corresponding to the outer contour of the lower half of the main line pipe (31) and a lower side pipe groove (206) corresponding to the outer contour of the lower half of the side line pipe (32); The bottom of the upper mold (22) is provided with two groups of symmetrically arranged upper molds (22), the top of the lower mold (21) is provided with a second slide groove (212) matching the upper mold (22), the two groups of upper molds (22) are relatively slidably connected to the top of the lower mold (21), the upper mold (22) is provided with an upper groove (202) corresponding to the outer contour of the upper half of the box body of the cable junction box (3), and the bottom of the upper mold (22) is also provided with an upper main pipe groove (203) corresponding to the outer contour of the upper half of the main line pipe (31), and an upper side pipe groove (204) corresponding to the outer contour of the upper half of the side line pipe (32); A first slide groove (252) is provided at the bottom of the side moving block (25), and a first slide rail (211) matching the first slide groove (252) is provided at one side of the lower mold (21). The side moving block (25) is slidably connected to the lower mold (21) along the axial direction of the lower side tube groove (206) via the first slide rail (211). Side core rods (5) are fixed to the bottoms of the side moving block (25) and the upper mold (22). The side core rod (5) on the upper mold (22) is coaxially arranged with the lower main tube groove (205), and the side core rod (5) on the side moving block (25) is coaxially arranged with the lower side tube groove (206); The side core rods (5) are sleeved with port sealing rings (4), one side of the port sealing rings (4) is fixed with a side pressure ring (42), the side pressure ring (42) and the side core rod (5) are coaxially arranged, the inner diameter of the side pressure ring (42) is equal to the outer diameter of the side core rod (5), the outer diameter of the side pressure ring (42) is equal to the outer diameter of the lower main pipe groove (205), and the outer diameters of the lower main pipe groove (205) and the lower side pipe groove (206) are equal; A side pressure groove (44) is provided on the side of the port sealing ring (4) away from the limiting pin (41), and a limiting pin (41) is also fixed on the side of the port sealing ring (4) opposite to the lower mold (21), and limiting holes corresponding to the limiting pin (41) are provided on the upper mold (22) and the side positioning block (25); A tension spring (43) is sleeved on the side pressure ring (42), and the tension spring (43) has an elastic force that drives the port sealing ring (4) away from the lower mold (21); The bottom of the mold core column (23) is provided with a mold core (231) corresponding to the inner contour of the box body of the cable junction box (3); the end of the side core rod (5) is a ball head structure; the mold core (231) is provided with a docking ball groove (232) corresponding to the end of the side core rod (5); and both sides of the mold core (231) are also provided with reserved grooves (233) matching the reserved seats (33); A main pressing frame (243) is fixed at the bottom of the cold pressing plate (24), the bottom contour of the main pressing frame (243) corresponds to the top contour of the cable junction box (3), a core groove (242) matching the core column (23) is provided in the main pressing frame (243), and the core column (23) is slidably connected in the core groove (242); A mold clamping door frame (26) is fixed on one side of the mold core column (23); two groups of symmetrically arranged active wedge blocks (261) are provided at the bottom of the mold clamping door frame (26); and a first mold clamping groove (221) corresponding to the active wedge blocks (261) is provided at the top of one side of the upper mold (22); A passive wedge block (222) is provided at the top of the other side of the upper mold (22), and a second mold-closing groove (251) corresponding to the passive wedge block (222) is provided at the top of the side positioning block (25).

2. The cold pressing equipment for polyvinyl chloride rubber material according to claim 1, characterized in that: The top of the mold core column (23) is fixedly connected to the bottom of the lifting platform (12), and the output end of the cold pressing oil cylinder (14) is fixedly connected to the top of the cold pressing plate (24).

3. The cold pressing equipment for polyvinyl chloride rubber material according to claim 1, characterized in that: A return spring is clamped between the upper mold (22), the side block (25) and the lower mold (21), and the return spring has an elastic force that drives the upper mold (22) and the side block (25) away from the lower mold (21).

4. The cold pressing equipment for polyvinyl chloride rubber material according to claim 1, characterized in that: The bottom of the cold pressing plate (24) is further provided with three groups of side pressing plates (241) arranged in a herringbone shape, and the bottom of the side pressing plate (241) is provided with a side pressing wedge block (2411) corresponding to the side pressing groove (44).

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