A core pulling device for injection mold of electric fusion pipe fittings

Abstract

The present invention discloses a core pulling device for an injection mold of an electric fusion pipe fitting, comprising: a base frame, a first lifting platform, a second lifting platform and a first oil cylinder, the base frame is provided with a vertical oil cylinder fixing plate and a demoulding fixing plate at intervals, the first oil cylinder is provided on the oil cylinder fixing plate and points to the demoulding fixing plate, the first lifting platform is provided on the base frame and is located between the oil cylinder fixing plate and the demoulding fixing plate, the second lifting platform is provided on the base frame and is located in front of the demoulding fixing plate, a demoulding card is provided on the front or back of the demoulding fixing plate, a mold core guide hole is provided in the demoulding card, a through hole corresponding to the mold core guide hole is provided on the demoulding fixing plate, and a lifting ear fixing piece is provided at the end of the first oil cylinder. Through the above manner, the core pulling device for an injection mold of an electric fusion pipe fitting described in the present invention strengthens the protection of the mold core, reduces the bumping and straining of the product surface, and the base frame has high strength and stable operation.

Description

Technical Field

[0001] The invention relates to the technical field of electric fusion pipe fitting production, in particular to a core pulling device for an injection mold of an electric fusion pipe fitting. Background Art

[0002] Electrofusion pipe fittings are usually produced using injection molds. After each mold opening, a demoulding machine is required to pull the core and demould to obtain a complete electrofusion pipe fitting.

[0003] The workbench and mold loading table of the existing demoulding machine are split. Due to the large pulling force during demoulding, the workbench on the cylinder side is prone to warping, affecting the demoulding effect and equipment life. In addition, the height of the workbench and the mold loading table is fixed. The diameters of the circular holes of the demoulding plates used in the production of different products are different, resulting in a height difference between the workbench and the mold loading table and the circular holes of the demoulding plates. If the height difference is large, the mold will be more easily damaged when it falls off, causing scratches and shortening the service life of the mold.

[0004] In addition, the workbench is usually an iron plate surface, which can easily scratch the mold during demoulding. There is no protection around the circular hole of the demoulding plate. The pulling force during demoulding is large, which can easily cause bumps and scratches on the product surface, reducing the product qualification rate. This needs to be improved. Summary of the invention

[0005] The main technical problem solved by the present invention is to provide a core pulling device for an electric fusion pipe injection mold, which improves the structural stability during core pulling, avoids knocks and scratches on the mold, and strengthens the protection of the product.

[0006] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a core pulling device for an electric fusion pipe injection mold, comprising: a base frame, a first lifting platform, a second lifting platform and a first oil cylinder, the base frame is provided with vertical oil cylinder fixing plates and demoulding fixing plates at intervals, the first oil cylinder is arranged on the oil cylinder fixing plate and points to the demoulding fixing plate, the first lifting platform is arranged on the base frame and is located between the oil cylinder fixing plate and the demoulding fixing plate, the second lifting platform is arranged on the base frame and is located in front of the demoulding fixing plate, a demoulding card plate is arranged on the front or back side of the demoulding fixing plate, a core guide hole is arranged in the demoulding card plate, a through hole corresponding to the core guide hole is arranged on the demoulding fixing plate, a lifting ear fixing piece is arranged at the end of the first oil cylinder, and a first lifting ear is arranged at the end of the lifting ear fixing piece.

[0007] In a preferred embodiment of the present invention, the first lifting platform and the second lifting platform respectively include a floating plate and a second oil cylinder, the second oil cylinders are respectively vertically arranged on the base frame, and the floating plate is horizontally arranged on the top of the second oil cylinder.

[0008] In a preferred embodiment of the present invention, the floating plate is covered with a plastic plate.

[0009] In a preferred embodiment of the present invention, the bottom array of the floating plate is provided with guide columns pointing downward, and the base frame is provided with guide sleeves concentric with the guide columns.

[0010] In a preferred embodiment of the present invention, the plastic plate is provided with a stepped hole, and a screw connected to the floating plate is provided in the stepped hole.

[0011] In a preferred embodiment of the present invention, the demoulding fixing plate or the base frame is symmetrically provided with guide rails located on both sides of the front side of the demoulding fixing plate, and the demoulding clamping plate is arranged between the guide rails on both sides.

[0012] In a preferred embodiment of the present invention, the guide rail is an angle steel, and the base frame is an integrated steel structure assembled and welded from steel pipes.

[0013] In a preferred embodiment of the present invention, a second lifting ear is provided on the demoulding pallet.

[0014] In a preferred embodiment of the present invention, the diameter of the core guide hole is smaller than the diameter of the through hole, avoidance grooves are arranged at intervals on the inner wall of the core guide hole, and a plastic protective ring is arranged in the core guide hole.

[0015] In a preferred embodiment of the present invention, the back sides of the oil cylinder fixing plate and the demoulding fixing plate are respectively provided with diagonal bracing rods connected to the base frame.

[0016] The beneficial effects of the present invention are as follows: the core pulling device of the electric fusion pipe injection mold pointed out by the present invention specially designs a first lifting platform and a second lifting platform, which can be raised and lowered to adapt to the height of the mold and the mold core, and has high concentricity during core pulling, avoiding the problem of falling and scratches when the mold core is pulled out, strengthening the protection of the mold core, and extending the service life of the mold. When the mold core is pulled out, it is guided by the mold core guide hole, with high stability, and the mold core guide hole is protected by a plastic protective ring to avoid direct contact between the product and the mold core guide hole, thereby reducing the surface bumps and strains of the product and improving the product qualification rate. The chassis has high strength and good support for the cylinder fixing plate and the demoulding fixing plate, avoiding deformation problems at the axis, and working more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0018] Figure 1It is a structural schematic diagram of a preferred embodiment of a core pulling device for an electric fusion pipe injection mold of the present invention;

[0019] Figure 2 yes Figure 1 Schematic diagram of the structure of the mid-frame;

[0020] Figure 3 yes Figure 1 A schematic diagram of a structure in which a plastic protective ring is installed;

[0021] Figure 4 yes Figure 3 Schematic diagram of the structure of the plastic protective ring;

[0022] Figure 5 yes Figure 1 A schematic diagram of a structure in which another plastic protective ring is installed;

[0023] Figure 6 yes Figure 5 Schematic diagram of the structure of the plastic protective ring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 to Figure 6 , the embodiment of the present invention includes:

[0026] like Figure 1 The core pulling device of the electrofusion pipe injection mold shown in the figure comprises: a base frame 1, a first lifting platform 13, a second lifting platform 14 and a first oil cylinder 10, as shown in the figure Figure 2 As shown, the base frame 1 is an integrated steel structure assembled and welded by steel pipes, has high structural strength, and is provided with supporting feet 11 at the bottom to facilitate horizontal adjustment. Vertical cylinder fixing plates 2 and demoulding fixing plates 3 are arranged at intervals on the base frame 1, and the backs of the cylinder fixing plates 2 and demoulding fixing plates 3 are respectively provided with diagonal support rods 8 connected to the base frame 1 to improve the tensile strength of the cylinder fixing plates 2 and the demoulding fixing plates 3 and avoid bending problems.

[0027] The first oil cylinder 10 is horizontally arranged on the back of the oil cylinder fixing plate 2 and points to the demoulding fixing plate 3. The first lifting platform 13 is arranged on the base frame 1 and is located between the oil cylinder fixing plate 2 and the demoulding fixing plate 3 to carry the mold core. The second lifting platform 14 is arranged on the base frame and is located in front of the demoulding fixing plate 3 to carry the mold. The heights of the first lifting platform 13 and the second lifting platform 14 can be adjusted to adapt to the structure of the mold core and the mold, so that the mold core and the pulling force are in the same straight line when the core is pulled, thereby reducing the problem of strain on the mold core and the product.

[0028] like Figure 1 As shown, the first lifting platform 13 and the second lifting platform 14 respectively include a floating plate 18 and a second oil cylinder 17, the second oil cylinder 17 is respectively vertically arranged on the base frame 1, the floating plate 18 is horizontally arranged on the top of the second oil cylinder 17, and the lifting and lowering of the floating plate 18 is adjusted by the second oil cylinder 17. The first oil cylinder 10 and the second oil cylinder 17 are respectively controlled by hydraulic pipelines and valves, and the operation is flexible.

[0029] The bottom array of the floating plate 18 is provided with guide columns pointing downwards, and the base frame 1 is provided with guide sleeves 16 concentric with the guide columns. The cooperation between the guide columns and the guide sleeves 16 improves the stability of the lifting and lowering of the floating plate 18 and avoids the problem of deflection.

[0030] The floating plate 18 is covered with a plastic plate 15, which is a steel plate. The plastic plate 15 can prevent the mold and the product from directly contacting the floating plate 18, thereby reducing the problem of collision between the product and the mold. The plastic plate 15 is provided with a stepped hole, in which a screw connected to the floating plate 18 is provided, so that the plastic plate 15 can be easily replaced.

[0031] The demoulding fixed plate 3 is provided with a demoulding card plate 4 on the front or back, and a core guide hole 5 is provided in the demoulding card plate 4. The demoulding fixed plate 3 is provided with a through hole 9 corresponding to the core guide hole 5. The diameter of the core guide hole 5 is smaller than the diameter of the through hole. The demoulding card plate 4 can be replaced to adapt to the extraction of cores of different sizes. The demoulding fixed plate 3 or the base frame 1 is symmetrically provided with guide rails 6 located on both sides of the front of the demoulding fixed plate 3. The guide rails 6 are angle steels. The demoulding card plate 4 is arranged between the guide rails 6 on both sides, and the demoulding card plate 4 is guided and limited forward and backward by the guide rails 6. The demoulding card plate 4 is provided with a second lifting ear 7 to facilitate the lifting and replacement of the demoulding card plate 4.

[0032] The end of the first oil cylinder 10 is provided with a lifting ear fixing part 12, which is fixed to the end of the first oil cylinder 10 by welding or threading. The end of the lifting ear fixing part 12 is provided with a first lifting ear 22, and the mold core is pulled through the first lifting ear 22.

[0033] Avoidance grooves are arranged at intervals on the inner wall of the mold core guide hole 5 to avoid the raised parts of the mold core and the product. A plastic protective ring 19 is arranged in the mold core guide hole 5 to avoid scratching the product. Positioning flanges 21 extending to the front and back sides of the demoulding card plate 4 are arranged on both sides of the plastic protective ring 19 to facilitate the fixing of the plastic protective ring 19.

[0034] There are two structures of the plastic protective ring 19:

[0035] The first one, such as Figure 3 and Figure 4 As shown, the plastic protective ring 19 is a whole circle of polytetrafluoroethylene molded structure, and an arc portion 20 is convexly arranged on the outer circle to fit the inner wall of the avoidance groove. The plastic protective ring 19, the arc portion 20 and the positioning flange 21 are produced by polytetrafluoroethylene and are integrally molded to wrap the core guide hole 5 in all directions, so as to achieve good protection effect.

[0036] The second type, such as Figure 5 and Figure 6 As shown, the plastic protection ring 19 is a one-segment or several-segment arc structure, which is mainly installed at the bottom of the core guide hole 5, focusing on wrapping and protecting the bottom of the core guide hole 5, and is easy to install and low in cost.

[0037] In summary, the core pulling device for an electrofusion pipe injection mold disclosed in the present invention can perform core pulling on various types of electrofusion pipe injection molds, is easy to operate, has a stable structure, strengthens the protection of the mold core and the product, and extends the service life of the mold core.

[0038] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A core pulling device for an electrofusion pipe injection mold, characterized in that: include: A base frame, a first lifting platform, a second lifting platform and a first oil cylinder, wherein a vertical oil cylinder fixing plate and a demoulding fixing plate are arranged at intervals on the base frame, the first oil cylinder is arranged on the oil cylinder fixing plate and points to the demoulding fixing plate, the first lifting platform is arranged on the base frame and is located between the oil cylinder fixing plate and the demoulding fixing plate, the second lifting platform is arranged on the base frame and is located in front of the demoulding fixing plate, a demoulding card plate is arranged on the front or back side of the demoulding fixing plate, a mold core guide hole is arranged in the demoulding card plate, a through hole corresponding to the mold core guide hole is arranged on the demoulding fixing plate, a lifting ear fixing piece is arranged at the end of the first oil cylinder, and a first lifting ear is arranged at the end of the lifting ear fixing piece, guide rails located on both sides of the front side of the demoulding fixing plate are symmetrically arranged on the demoulding fixing plate or the base frame, the demoulding card plate is arranged between the guide rails on both sides, the diameter of the mold core guide hole is smaller than the diameter of the through hole, avoidance grooves are arranged at intervals on the inner wall of the mold core guide hole, and a plastic protective ring is arranged in the mold core guide hole.

2. The core pulling device for the electrofusion pipe injection mold according to claim 1, characterized in that: The first lifting platform and the second lifting platform respectively include a floating plate and a second oil cylinder, the second oil cylinders are respectively vertically arranged on the base frame, and the floating plate is horizontally arranged on the top of the second oil cylinder.

3. The core pulling device for the electrofusion pipe injection mold according to claim 2, characterized in that: The floating plate is covered with a plastic plate.

4. The core-pulling device for an electric fusion pipe injection mold according to claim 2, characterized in that: The bottom array of the floating plate is provided with guide columns pointing downwards, and the base frame is provided with guide sleeves concentric with the guide columns.

5. The core-pulling device for an electric fusion pipe injection mold according to claim 3, characterized in that: The plastic plate is provided with a stepped hole, in which a screw connected with the floating plate is provided.

6. The core-pulling device for an electric fusion pipe injection mold according to claim 1, characterized in that: The guide rail is an angle steel, and the base frame is an integrated steel structure assembled and welded by steel pipes.

7. The core-pulling device for an electric fusion pipe injection mold according to claim 1, characterized in that: The demoulding plate is provided with a second lifting ear.

8. The core pulling device for an electrofusion pipe injection mold according to claim 1, characterized in that: The backs of the oil cylinder fixing plate and the demoulding fixing plate are respectively provided with diagonal bracing rods connected with the base frame.

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