A common-mode mechanism for multi-specification threaded expansion joint covers

Abstract

The present invention discloses a common mold mechanism for multi-specification threaded expansion joint covers, belonging to the technical field of injection molds. A plurality of mold components are arranged on the mold body; the mold components include a stepped through hole arranged on the mold body, an outer mold ring is vertically rotatably arranged in the stepped through hole, and a core shaft is rotatably arranged inside the outer mold ring; an outer sealing ring is arranged in the upper part of the gap between the stepped through hole and the outer mold ring, and an inner sealing ring is arranged in the upper part of the gap between the outer mold ring and the core shaft; the inner wall of the stepped through hole, the outer wall of the outer mold ring and the outer sealing ring form a large cavity; the inner wall of the outer mold ring, the outer wall of the core shaft and the inner sealing ring form a small cavity; threads are arranged on the upper parts of the outer wall of the outer mold ring and the outer wall of the core shaft; the present invention can organically unify the molds of a plurality of expansion joint covers on the same injection mold, improve the utilization rate of the mold and reduce the cost.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, and particularly relates to a common mold mechanism for multi-specification threaded expansion joint covers. Background Art

[0002] Products of different models have different sizes, resulting in the need for an independent mold for each type of plastic expansion joint cover, making the utilization rate of traditional molds low. Summary of the Invention

[0003] In view of this, the present invention provides a common mold mechanism for multi-specification threaded expansion joint covers, which can organically unify the molds of multiple expansion joint covers on the same injection mold, improve the utilization rate of the mold, and reduce costs.

[0004] To achieve the above object, the present invention provides a common mold mechanism for multi-specification threaded expansion joint covers. Multiple sets of mold components are arranged on the mold body; each mold component includes a stepped through-hole arranged on the mold body, an outer mold ring is vertically rotatably arranged in the stepped through-hole, and a core shaft is rotatably arranged inside the outer mold ring; an outer sealing ring is arranged in the upper part of the gap between the stepped through-hole and the outer mold ring, and an inner sealing ring is arranged in the upper part of the gap between the outer mold ring and the core shaft; the inner wall of the stepped through-hole, the outer wall of the outer mold ring and the outer sealing ring form a large cavity; the inner wall of the outer mold ring, the outer wall of the core shaft and the inner sealing ring form a small cavity; threads are arranged on the upper parts of the outer wall of the outer mold ring and the outer wall of the core shaft. By installing multiple sets of mold components on the same mold body, the use efficiency of a single mold body can be improved, thereby reducing the waste of space resources and reducing costs.

[0005] Further, the stepped through-hole and the outer mold ring are rotatably connected through a first bearing, and the outer mold ring and the core shaft are rotatably connected through a second bearing. The stepped through-hole and the outer mold ring, and the outer mold ring and the core shaft are all connected through bearings, which can avoid rotation while ensuring free rotation.

[0006] Further, the number of sets of mold components is two. Two sets of mold components can reduce the production difficulty and balance the production difficulty, design difficulty and economy.

[0007] Further, the length of the core shaft is greater than the length of the outer mold ring; a transmission component is arranged at the lower part of the mold body; the transmission component includes a first gear fixedly arranged on the outer side of a section of the outer mold ring located at the lower part of the mold body, and all the first gears are meshed and connected to a first transmission gear; a second gear is arranged at the lower end of the core shaft and below the first gear, and all the second gears are meshed and connected to a second transmission gear; a gear shaft is fixedly arranged in the middle of the first transmission gear, and a third transmission gear is arranged at the bottom of the gear shaft. The cooperation between the first gear and the first transmission gear, and the cooperation between the second gear and the second transmission gear can provide a transmission path for the outer mold ring and the core shaft.

[0008] Furthermore, two square connecting plates are fixedly arranged at the lower part of the mold body. An installation seat is fixedly arranged at the lower part of the square connecting plate, and a transmission seat is arranged at the lower part of the installation seat. The second gear, the second transmission gear and the third transmission gear are all rotatably installed in the transmission seat. The gear shaft is rotatably arranged on the transmission seat. The square connecting plate, the installation seat and the transmission seat can cooperate to provide transmission space support for the transmission path of the outer mold ring and the core shaft.

[0009] Furthermore, a first power gear set is arranged on the third transmission gear for cooperation therewith; a second power gear set is arranged on the second transmission gear for cooperation therewith; the first power gear and the second power gear are respectively driven by motors located on both sides of the mold body, and the two motors respectively perform power transmission for two groups of outer mold rings and two groups of core shafts.

[0010] Furthermore, a rotating shaft for installing the third transmission gear, the first power gear set and the second power gear set is rotatably arranged in the transmission seat, and the rotating shaft can provide a supporting effect for the third transmission gear, the first power gear set and the second power gear set.

[0011] Furthermore, both the gear shaft and the core shaft freely penetrate and are installed in the installation seat.

[0012] Furthermore, the core shaft at the lower part of the second transmission gear is rotatably arranged in the installation seat through a third bearing, and there is a gap between the lower shaft end of the core shaft and the installation seat. Installing the third bearing at the lower part of the core shaft can provide a supporting force at the lower end of the core shaft.

[0013] Furthermore, the mold body includes a positioning plate above and a main body plate fixedly connected to the positioning plate. Four positioning shafts are arranged on the upper side of the positioning plate, and the cover plate is installed on the positioning plate through the positioning shafts. The cover plate can cooperate with the mold body to limit the large cavity and the small cavity, so that the upper surface of the product is flat.

[0014] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects:

[0015] The present invention rationally utilizes the mold space, concentrically arranges the templates of two threaded expansion joint covers with different sizes to form a mold assembly, and installs multiple identical mold assemblies on the same mold body. All the smaller threaded expansion joint cover products on this mold body share the same power motor through a gear transmission structure, and all the larger threaded expansion joint cover products share the same power motor through a gear transmission structure. Compared with the current independent molds, the present invention can produce 4 threaded expansion joint cover products simultaneously on one mold body, and only two power motors are required, which can reduce the product cost and space cost of the mold body in the same space.

[0016] The inner side of the threaded expansion joint cover discharges through internal threads. The oil motor drives the second power gear set connected to the mandrel, thereby driving the second transmission gear. The second transmission gear drives the second gear to rotate, and the second gear causes the mandrel to rotate, so that the threads on the mandrel rotate, simultaneously threading and pushing out the two threaded expansion joint covers in the small cavities outside the two mandrels. Then the oil motor stops working, and the oil motor on the first power gear set drives the first power gear set to rotate, thereby driving the third transmission gear, the gear shaft, and the first transmission gear to rotate. The first transmission gear drives the first gear to rotate, so that the outer mold ring rotates, and the threads on the outer mold ring thread and push out the threaded expansion joint cover outside the outer mold ring. The unloading of the injection-molded product can be automatically driven by the motor. At the same time, the same motor can drive the threaded expansion joint covers at the same positions on different groups of mold components to discharge materials, which can reduce labor costs. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of a common mold mechanism for multi-specification threaded expansion joint covers of the present invention;

[0018] Figure 2 It is a schematic diagram of the mold components and transmission structure of a common mold mechanism for multi-specification threaded expansion joint covers of the present invention;

[0019] Figure 3 It is a schematic cross-sectional structure diagram of a common mold mechanism for multi-specification threaded expansion joint covers of the present invention after installing the cover plate;

[0020] Reference Signs:

[0021] 100, mold body; 110, main body plate; 120, positioning plate; 121, positioning shaft; 200, mold component; 210, stepped through hole; 220, outer mold ring; 230, mandrel; 240, outer sealing ring; 250, inner sealing ring; 260, first bearing; 270, second bearing; 280, third bearing; 300, transmission component; 310, first gear; 320, second gear; 330, first transmission gear; 340, second transmission gear; 350, gear shaft; 360, third transmission gear; 370, first power gear set; 380, second power gear set; 400, square connecting plate; 500, mounting seat; 600, transmission seat; 700, motor; 800, threaded expansion joint cover; 900, cover plate. Detailed Description of the Embodiment

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will combine the accompanying drawings of the embodiments of the present invention Figures 1-3, the technical solutions of the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0023] As Figures 1-3 shown: A common mold mechanism for multi-specification threaded expansion joint covers. There are two sets of mold components 200 arranged on the mold body 100. The product sizes of the two sets of mold components 200 can be the same or different.

[0024] The mold component 200 includes a stepped through hole 210 arranged on the mold body 100. An outer mold ring 220 is vertically rotatably arranged in the stepped through hole 210. A core shaft 230 is rotatably arranged inside the outer mold ring 220. The core shaft 230 is a solid rod and is a stepped shaft. At the same time, the core shaft 230, the outer mold ring 220, and the stepped through hole should all be coaxial.

[0025] Vertical concave-convex surfaces should be provided on the inner wall of the outer mold ring 220 and the inner wall of the stepped through hole 210 to ensure that the part does not rotate simultaneously with the thread when demolding.

[0026] An outer sealing ring 240 is arranged in the upper part of the gap between the stepped through hole 210 and the outer mold ring 220. An inner sealing ring 250 is arranged in the upper part of the gap between the outer mold ring 220 and the core shaft 230. Both the outer sealing ring 240 and the inner sealing ring 250 should have good heat resistance. At the same time, the outer sealing ring 240 and the inner sealing ring 250 need to have good sealing performance to prevent liquid leakage during injection molding. The material can be rubber material or a high-precision sealed stepped shaft made of metal.

[0027] The inner wall of the stepped through hole 210, the outer wall of the outer mold ring 220, and the outer sealing ring 240 form a large cavity.

[0028] The inner wall of the outer mold ring 220, the outer wall of the core shaft 230, and the inner sealing ring 250 form a small cavity.

[0029] The large cavity and the small cavity are respectively used for injection molding the large-sized threaded expansion joint cover 800 and the small-sized threaded expansion joint cover 800.

[0030] Threads are provided on the upper parts of the outer wall of the outer mold ring 220 and the outer wall of the core shaft 230. The threads are external threads and are only provided on the outer walls of the outer mold ring 220 and the core shaft 230 in the sections where the large cavity and the small cavity are located.

[0031] The stepped through-hole 210 is rotatably connected to the outer die ring 220 through a first bearing 260, and the outer die ring 220 is rotatably connected to the mandrel 230 through a second bearing 270. Since the first bearing 260 is on the outside and the second bearing 270 is on the inside, the size of the first bearing 260 is larger than that of the second bearing 270. Corresponding steps should also be provided on the outside of the outer die ring 220 so that the first bearing 260 and the second bearing 270 can play a supporting role in only rotating the outer die ring 220 and the mandrel 230. The first bearing 260 and the second bearing 270 can be deep groove ball bearings or cylindrical roller bearings;

[0032] The sizes of the large-thread expansion joint cover 800 and the small-thread expansion joint cover 800 can be 50mm, 75mm, 110mm, 160mm, etc. They are produced by arbitrarily matching one large and one small, and the difference between the two sizes is preferably not less than 25mm.

[0033] According to an embodiment of the present invention, as Figures 1-3 shown, the length of the mandrel 230 is greater than the length of the outer die ring 220;

[0034] A transmission component 300 is provided at the lower part of the mold body 100;

[0035] The transmission component 300 includes a first gear 310 fixedly provided on the outside of a section of the outer die ring 220 located at the lower part of the mold body 100. A corresponding structure for fixing the gear should be installed on the outer die ring 220 below the first gear 310, which can be a nut and an external thread provided between the outer die ring 220. The first gear 310 and the outer die ring 220 can be key-connected, or can be adhesively bonded or welded. All the first gears 310 are meshed and connected to the first transmission gear 330; when the number of the first gears 310 is 2 - 3, the first gears 310 can be directly meshed with the first transmission gear 330. When the number of the first gears 310 is large, other gears should be used for transmission to achieve the effect of driving the first gears 310 to rotate;

[0036] A second gear 320 is provided at the lower end of the mandrel 230 and below the first gear 310. All the second gears 320 are meshed and connected to the second transmission gear 340;

[0037] A gear shaft 350 is fixedly provided in the middle of the first transmission gear 330, and a third transmission gear 360 is provided at the bottom of the gear shaft 350; The sizes of the first gear 310 and the third gear can be the same or different. The first gear 310 and the gear shaft 350 can be adhesively bonded or welded, which can all meet the use requirements;

[0038] Two square connecting plates 400 are fixedly arranged at the lower part of the mold body 100. The two square connecting plates 400 are installed in parallel, and a space for the transmission of the outer mold ring 220 and the mandrel 230 is left between the two square connecting plates 400. An installation seat 500 is fixedly arranged at the lower part of the square connecting plate 400, and a transmission seat 600 is arranged at the lower part of the installation seat 500. Gray cast iron, which is economical and practical, should be used for the square connecting plate 400, the installation seat 500 and the transmission seat 600;

[0039] The second gear 320, the second transmission gear 340 and the third transmission gear 360 are all rotatably installed in the transmission seat 600, and a cavity for the second gear 320, the second transmission gear 340 and the third transmission gear 360 should be left in the transmission seat 600;

[0040] The gear shaft 350 is rotatably arranged on the transmission seat 600, and the gear shaft 350 and the transmission seat 600 can be connected through a bearing;

[0041] A first power gear set 370 which is matched with it is arranged on the third transmission gear 360; a second power gear set 380 which is matched with it is arranged on the second transmission gear 340;

[0042] The first power gear set 370 and the second power gear set 380 are mainly to meet the distance between the motor 700 and the target gear;

[0043] The first power gear and the second power gear are respectively driven by motors 700 located on both sides of the mold body 100. The motor 700 can be an oil motor 700 or an electric motor 700, and both can meet the use requirements;

[0044] A rotating shaft for installing the third transmission gear 360, the first power gear set 370 and the second power gear set 380 is rotatably arranged in the transmission seat 600, and the rotating shaft can be rotatably arranged in the transmission seat 600 through a bearing;

[0045] Both the gear shaft 350 and the mandrel 230 freely penetrate through the installation seat 500. Freely penetrating means that corresponding through holes are arranged on the installation seat 500, and both the gear shaft 350 and the mandrel 230 are installed in the through holes, and the rotation of the gear shaft 350 and the mandrel 230 is not interfered by the installation seat 500;

[0046] The installation seat 500 can be used to position the oil motor 700, and at the same time, it avoids the hollow transmission seat 600 directly supporting the upper mold body 100, improving safety;

[0047] The mandrel 230 at the lower part of the second transmission gear 340 is rotatably arranged in the mounting seat 500 through the third bearing 280, and there is a gap between the lower shaft end of the mandrel 230 and the mounting seat 500. A cavity for bearing the third bearing 280 should be provided in the mounting seat 500.

[0048] According to an embodiment of the present invention, as Figures 1-3 shown, the mold body 100 includes a positioning plate 120 above and a main body plate 110 fixedly connected to the positioning plate 120. Four positioning shafts 121 are provided on the upper side of the positioning plate 120. The cover plate 900 is installed on the positioning plate 120 through the positioning shafts 121. The cover plate 900 should be a detachable structure, and a corresponding injection molding structure should also be installable on the cover plate 900. At the same time, corresponding hot runner injection paths are provided on the cover plate 900 to facilitate the injection molding requirements.

[0049] In addition, it should be noted that in the description of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The above is the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle described in the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A common mold mechanism for multi-specification threaded expansion joint covers, characterized in that: There are multiple sets of mold components (200) arranged on the mold body (100); The mold component (200) includes a stepped through-hole (210) arranged on the mold body (100). An outer mold ring (220) is vertically rotatably arranged in the stepped through-hole (210), and a core shaft (230) is rotatably arranged inside the outer mold ring (220); An outer sealing ring (240) is arranged in the upper part of the gap between the stepped through-hole (210) and the outer mold ring (220), and an inner sealing ring (250) is arranged in the upper part of the gap between the outer mold ring (220) and the core shaft (230); The inner wall of the stepped through-hole (210), the outer wall of the outer mold ring (220) and the outer sealing ring (240) form a large cavity; The inner wall of the outer mold ring (220), the outer wall of the core shaft (230) and the inner sealing ring (250) form a small cavity; Threads are arranged on the upper parts of the outer wall of the outer mold ring (220) and the outer wall of the core shaft (230); The length of the core shaft (230) is greater than the length of the outer mold ring (220); A transmission component (300) is arranged at the lower part of the mold body (100); The transmission component (300) includes a first gear (310) fixedly arranged on the outer side of a section of the outer mold ring (220) located at the lower part of the mold body (100). All the first gears (310) are meshed and connected to a first transmission gear (330); A second gear (320) is arranged at the lower end of the core shaft (230) and below the first gear (310). All the second gears (320) are meshed and connected to a second transmission gear (340); A gear shaft (350) is fixedly arranged in the middle of the first transmission gear (330), and a third transmission gear (360) is arranged at the bottom of the gear shaft (350).

2. The multi-specification thread expansion joint cover common mold mechanism according to claim 1, characterized in that: The stepped through-hole (210) and the outer mold ring (220) are rotationally connected through a first bearing (260), and the outer mold ring (220) and the core shaft (230) are rotationally connected through a second bearing (270).

3. The common mold mechanism of a multi-specification threaded expansion joint cover according to claim 1, characterized in that: The number of sets of the mold components (200) is two groups.

4. A common mold mechanism for multi - specification threaded expansion joint covers as described in claim 1, characterized in that: Two square connecting plates (400) are fixedly arranged at the lower part of the mold body (100). An installation seat (500) is fixedly arranged at the lower part of the square connecting plate (400), and a transmission seat (600) is arranged at the lower part of the installation seat (500); The second gear (320), the second transmission gear (340) and the third transmission gear (360) are all rotatably installed in the transmission seat (600); The gear shaft (350) is rotatably arranged on the transmission seat (600).

5. The multi-specification thread expansion joint cover co-molding mechanism according to claim 4, characterized in that: A first power gear set (370) that mates with it is arranged on the third transmission gear (360); A second power gear set (380) that mates with it is arranged on the second transmission gear (340); The first power gear and the second power gear are respectively driven by motors (700) located on both sides of the mold body (100).

6. The multi-specification threaded expansion joint cover co-molding mechanism according to claim 5, characterized in that: A rotating shaft for mounting a third transmission gear (360), a first power gear set (370) and a second power gear set (380) is rotatably arranged in the transmission seat (600).

7. The multi-specification threaded expansion joint cover common mold mechanism according to claim 6, characterized in that: Both the gear shaft (350) and the core shaft (230) freely penetrate through the mounting seat (500).

8. The common die mechanism of a multi - specification threaded expansion joint cover according to claim 7, characterized in that: The core shaft (230) at the lower part of the second transmission gear (340) is rotatably arranged in the mounting seat (500) through a third bearing (280), and a gap is left between the lower shaft end of the core shaft (230) and the mounting seat (500).

9. The common die mechanism for multi-specification threaded expansion joint covers as described in claim 1, characterized in that: The mold body (100) includes a positioning plate (120) above and a main body plate (110) fixedly connected to the positioning plate (120). Four positioning shafts (121) are arranged on the upper side of the positioning plate (120), and the cover plate (900) is mounted on the positioning plate (120) through the positioning shafts (121).

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