A rotational injection mold structure

Abstract

The present application discloses a rotary transformer injection mold structure, which belongs to the technical field of rotary transformers. It mainly includes a lower mold base; a lower mold assembly, a cooling assembly, and a top mold assembly. The top mold assembly is suitable for ejecting the iron core, and the top mold assembly is installed inside the lower mold base; an upper mold assembly, which is suitable for closing the mold of the iron core, and the upper mold assembly is arranged above the lower mold base. The upper mold assembly includes: an upper mold base, which is arranged above the lower mold base, and an injection port is arranged on the upper mold base; an upper mold, which is installed on the upper mold base, and two groups of upper mold cavities are opened on the upper mold; two groups of upper movable molds, which are respectively arranged inside the two groups of upper mold cavities, and a spring is commonly connected between the upper movable mold and the cavity wall of the upper mold cavity. A rotary transformer injection mold structure of the present application, through the upper mold assembly, the clamping force generated when the iron core thickness is high during closing the mold is offset to prevent the iron core from deforming, so as to achieve the effect of removing the clamping force during closing the mold.

Description

Technical Field

[0001] The present application relates to the technical field of rotary transformers, and in particular to a rotary transformer injection mold structure. Background Art

[0002] Resolver, also known as rotary transformer, is used to measure the angular displacement and angular velocity of the rotating shaft of a rotating object. It consists of a stator and a rotor.

[0003] During the production process of the rotary transformer, its core needs to be injection molded to form a solid shell to ensure its normal use;

[0004] At present, when the iron core is injection molded, multiple groups of silicon steel sheets are usually stacked and riveted into an iron core, which is then placed in the mold cavity of the lower mold, and then the upper mold is molded to close it, and finally the injection molding is performed. The thickness of the silicon steel sheets itself has a tolerance. After stacking and riveting the iron core, the existence of the accumulated tolerance leads to a large difference in the thickness of each iron core. For example, when the thickness of the iron core is higher than the mold cavity in the lower mold, continuing to close the mold will cause the iron core to bear too much clamping force, which will cause the inner and outer diameters of the iron core to deform.

[0005] Therefore, it is necessary to provide a rotational injection mold structure to solve the above problems.

[0006] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the prior art. Summary of the invention

[0007] Based on the above problems existing in the prior art, the problem to be solved by the present application is: to provide a rotational injection mold structure to achieve the effect of removing the clamping force when closing the mold.

[0008] The technical solution adopted by the present application to solve its technical problems is: a rotational injection mold structure, including a lower mold base; a lower mold assembly, which is suitable for placing an iron core and is installed on the lower mold base; a cooling assembly, which is suitable for cooling the mold and is installed on the lower mold base; a top mold assembly, which is suitable for ejecting the iron core and is installed inside the lower mold base; an upper mold assembly, which is suitable for closing the mold of the iron core and is arranged above the lower mold base, and the upper mold assembly includes: an upper mold base, which is arranged above the lower mold base and is provided with an injection port; an upper mold, which is installed on the upper mold base and is provided with two groups of upper mold cavities; two groups of upper movable molds, which are respectively arranged inside the two groups of upper mold cavities, and a spring is commonly connected between the upper movable mold and the cavity wall of the upper mold cavity.

[0009] Furthermore, the lower mold assembly includes a lower mold installed on a lower mold base, and two groups of lower mold cavities are opened inside the lower mold.

[0010] Furthermore, the cooling assembly includes a circulating liquid inlet pipe installed inside the lower mold base, a circulating cooling cavity is opened inside the lower mold base, and a circulating liquid outlet pipe is installed inside the circulating cooling cavity.

[0011] Furthermore, the top mold assembly includes a lower base movably arranged inside the lower mold base, an upper base is arranged on the lower base, at least two groups of grooves are opened inside the lower base and the upper base, a lower ejector pin is movably arranged inside the groove, an elastic member is commonly arranged between the lower ejector pin and the bottom wall of the groove, an upper ejector pin is arranged on the lower ejector pin, and the upper ejector pin is movably arranged inside the lower mold cavity.

[0012] Furthermore, a screw rod is installed at the bottom of the upper ejector pin, and a screw hole is opened inside the lower ejector pin.

[0013] The beneficial effect of the present application is that the present application provides a rotational injection mold structure, which, through the upper mold assembly, offsets the clamping force generated when the iron core is thick during mold closing to prevent deformation of the iron core, thereby achieving the effect of removing the clamping force during mold closing.

[0014] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0016] In the attached picture:

[0017] Figure 1 This is an overall schematic diagram of a rotational injection mold structure in this application;

[0018] Figure 2 for Figure 1 A partial cross-sectional schematic diagram of the whole;

[0019] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0020] Figure 4 for Figure 2 The enlarged schematic diagram of point B in the middle;

[0021] Figure 5 for Figure 2 A partial cross-sectional schematic diagram of the middle and lower die base;

[0022] Figure 6 for Figure 5 The enlarged schematic diagram of the center C;

[0023] Among them, the reference numerals in the figure are:

[0024] 1. Lower die base; 2. Upper die assembly; 21. Upper die base; 22. Upper die; 23. Upper die cavity; 24. Upper movable die; 25. Spring; 3. Lower die assembly; 31. Lower die; 32. Lower die cavity; 4. Top die assembly; 41. Upper base; 42. Lower base; 43. Elastic part; 44. Upper ejector pin; 45. Screw; 46. Screw hole; 47. Lower ejector pin; 5. Cooling assembly; 51. Circulating liquid inlet pipe; 52. Circulating liquid outlet pipe. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0027] like Figure 1-Figure 2 As shown, the present application provides a rotational injection mold structure, including a lower mold base 1, a lower mold assembly 3 is arranged on the lower mold base 1, and the lower mold assembly 3 is used to place the iron core. At the same time, an upper mold assembly 2 is arranged above the lower mold base 1, and the upper mold assembly 2 is used to close the mold of the iron core. At the same time, a cooling assembly 5 is arranged inside the lower mold base 1, and the cooling assembly 5 is used to cool the mold. At the same time, a top mold assembly 4 is arranged inside the lower mold base 1, and the top mold assembly 4 is used to eject the iron core. Specifically:

[0028] like Figure 1-Figure 2 and Figure 4 As shown, the lower die assembly 3 includes a lower die 31 fixedly mounted on the lower die base 1, and two sets of lower die cavities 32 are opened inside the lower die 31 to facilitate the placement of the iron core;

[0029] like Figure 1-Figure 3 As shown, the upper mold assembly 2 includes an upper mold base 21 disposed on the lower mold base 1, and an injection port (not shown in the figure) is disposed on the upper mold base 21, and is connected to an injection molding device through the injection port to facilitate injection molding;

[0030] At the same time, an upper mold 22 is fixedly installed on the upper mold base 21, and two groups of upper mold cavities 23 are opened on the upper mold 22. An upper movable mold 24 is movably arranged inside the upper mold cavity 23, and a spring 25 is commonly connected between the upper movable mold 24 and the cavity wall of the upper mold cavity 23 to prevent the thickness of the iron core from being higher than the lower mold cavity 32. The upper movable mold 24 is molded with the iron core to deform the iron core. The upper movable mold 24 first contacts the iron core, and then the mold is continuously closed. The spring 25 is deformed to reduce the pressure during the mold closing to prevent the iron core from deforming. It should be noted that the upper mold base 21 is connected to the electric cylinder to drive the upper mold 22 to move downward and close the mold;

[0031] like Figure 1 As shown, the cooling assembly 5 includes a circulating liquid inlet pipe 51 installed inside the lower die base 1, and a circulating cooling cavity is opened inside the lower die base 1, and a circulating liquid outlet pipe 52 is fixedly installed inside the circulating cooling cavity. Driven by the circulating liquid inlet pipe 51 and the circulating liquid outlet pipe 52, the coolant circulates to cool the mold, thereby cooling and shaping the iron core. It should be noted that the upper die base 21 has the same cooling assembly 5;

[0032] like Figure 2 and Figure 5-Figure 6 As shown, the ejector assembly 4 includes a lower base 42 movably arranged inside the lower die base 1, and an upper base 41 is arranged on the lower base 42, and multiple groups of grooves are provided inside the lower base 42 and the upper base 41, and a lower ejector pin 47 is movably arranged inside the groove, and an elastic member 43 is commonly arranged between the lower ejector pin 47 and the bottom wall of the groove, and an upper ejector pin 44 is arranged on the lower ejector pin 47, and the upper ejector pin 44 is movably arranged inside the lower die cavity 32. It should be noted that the groove is located below the iron core, and the lower base 42 is connected to the output end of the cylinder, and the cylinder is installed at the bottom of the lower die base 1, so as to drive the upper base 41 and the ejector pin to move upward, so as to eject the injection-molded iron core out of the lower die cavity 32;

[0033] At the same time, a screw rod 45 is fixedly installed at the bottom of the upper ejector pin 44, and a screw hole 46 adapted to the screw rod 45 is opened inside the lower ejector pin 47, so that when the ejector pin is severely worn after long-term use and needs to be replaced, the upper ejector pin 44 is exposed when passing through the cylinder, and then the upper ejector pin 44 is loosened and replaced with a new one.

[0034] To sum up, when the iron core is injection molded, the iron core is placed in the lower mold assembly 3, and then the mold is closed by the upper mold assembly 2, and the clamping force during the mold closing is removed by the upper mold assembly 2 to prevent the iron core from being deformed due to excessive clamping force. Then, the iron core is injection molded by the injection molding equipment, and the cooling assembly 5 cools and shapes it, and finally the workpiece is ejected by the top mold assembly 4.

[0035] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rotational injection mold structure, characterized in that: include: Lower die base (1); A lower die assembly (3), the lower die assembly (3) being suitable for placing an iron core, the lower die assembly (3) being mounted on the lower die base (1); A cooling component (5), which is suitable for cooling the mold, and the cooling component (5) is installed on the lower mold base (1); A top mold assembly (4), the top mold assembly (4) is suitable for ejecting the iron core, and the top mold assembly (4) is installed inside the lower mold base (1); An upper die assembly (2) is suitable for closing the die of the iron core. The upper die assembly (2) is arranged above the lower die base (1). The upper die assembly (2) comprises: An upper mold base (21), the upper mold base (21) being arranged above the lower mold base (1), and the upper mold base (21) being provided with an injection port; An upper mold (22), wherein the upper mold (22) is mounted on the upper mold base (21), and the upper mold (22) is provided with two groups of upper mold cavities (23); Two groups of upper movable dies (24) are respectively arranged inside the two groups of upper die cavities (23); a spring (25) is commonly connected between the upper movable dies (24) and the cavity wall of the upper die cavity (23).

2. A rotational injection mold structure according to claim 1, characterized in that: The lower die assembly (3) comprises a lower die (31) mounted on the lower die base (1), and two groups of lower die cavities (32) are provided inside the lower die (31).

3. The rotational injection mold structure according to claim 1, characterized in that: The cooling assembly (5) comprises a circulating liquid inlet pipe (51) installed inside the lower die base (1); a circulating cooling cavity is provided inside the lower die base (1); and a circulating liquid outlet pipe (52) is installed inside the circulating cooling cavity.

4. The rotational injection mold structure according to claim 2, characterized in that: The top mold assembly (4) comprises a lower base (42) movably arranged inside the lower mold base (1); an upper base (41) is arranged on the lower base (42); at least two groups of grooves are provided inside the lower base (42) and the upper base (41); a lower ejector pin (47) is movably arranged inside the groove; an elastic member (43) is commonly arranged between the lower ejector pin (47) and the bottom wall of the groove; an upper ejector pin (44) is arranged on the lower ejector pin (47); and the upper ejector pin (44) is movably arranged inside the lower mold cavity (32).

5. The rotational injection mold structure according to claim 4, characterized in that: A screw rod (45) is installed at the bottom of the upper ejector pin (44), and a screw hole (46) is opened inside the lower ejector pin (47).

Images