Injection mold for automobile water pump shell

Abstract

The invention relates to the field of injection molds, in particular to an injection mold for an automobile water pump shell, which comprises a fixed mold and a movable mold, and further comprises: a screw rod, one end of which is fixedly connected with the movable mold and the screw pitch of a spiral groove is gradually reduced from the middle section to the two ends; the nut is composed of an even number of spiral elastic metal pieces, and spiral bodies of the elastic metal pieces are coaxial. According to the injection mold for the automobile water pump shell, a non-servo-controlled common motor is used for driving and controlling the mold to operate at different speeds in different stages in the mold opening and closing processes, and finally the purpose that a movable mold slowly moves in the initial stage of mold closing and the final stage of mold closing, and the movable mold rapidly moves in the non-slow-moving requirement is achieved; the moving speed of the movable mold can be controlled with lower equipment cost and simple use and maintenance difficulty, and the problems of higher equipment cost and higher use and maintenance skill threshold of a driving mode of a small and micro injection mold in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of injection molds, and in particular to an injection mold for an automotive water pump housing. Background Technology

[0002] Injection molds are generally divided into two main parts: a fixed mold and a moving mold. The fixed mold is fixed to the equipment base frame, while the moving mold moves and is responsible for mold closing and opening. During the mold closing process, in order to avoid mold impact, it is necessary to buffer or control the moving mold to decelerate before the final mold closing. In the initial stage of mold opening, the moving mold also needs to be slowly separated from the fixed mold before the mold opening is accelerated to avoid deformation of the newly shaped product caused by excessively fast mold opening speed.

[0003] Existing injection mold drive methods are mainly divided into compressed air driven cylinders and electric driven servo systems. From the perspective of control effect, traditional injection mold drive forces mostly use cylinders. The disadvantage of cylinders is obvious, that is, it is difficult to precisely control the movement speed and pushing and pulling force. On the other hand, servo systems can precisely control the movement speed of the moving mold. From the perspective of equipment cost, especially for plastic parts (small injection molded parts) on the housing of automotive water pumps, the cost of both pneumatic and servo systems is relatively high. The former requires equipment such as air compressors, special equipment pressure vessels, compressed air dryers and cylinders, while the latter requires CNC electrical equipment such as CNC motors, drivers, motion control boards, frequency converters, etc., as well as high-threshold skills in use, parameter adjustment and maintenance (involving human resource costs in addition to equipment).

[0004] In summary, the advantages and disadvantages of the current driving methods for micro-injection molds have been briefly introduced. Among them, the servo system is more advanced. Its main disadvantages are the high cost of digital equipment (the digital equipment controller also has hidden software licensing costs) and the high barrier to entry. Therefore, this invention proposes an injection mold for an automotive water pump housing driven by a non-servo motor. Summary of the Invention

[0005] Given that the driving methods of small and micro injection molds mentioned above or in the prior art, which simultaneously achieve rapid movement and delicate slow start control during the movement of the moving mold, present problems such as high equipment costs and high skill thresholds for use and maintenance, this invention is proposed.

[0006] Therefore, the object of the present invention is to provide an injection mold for an automotive water pump housing.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an injection mold for an automotive water pump housing, comprising a fixed mold and a moving mold, further comprising: a lead screw, one end of which is fixedly connected to the moving mold, the pitch of which gradually decreases from the middle section to both ends; a nut, composed of an even number of helical elastic metal parts, wherein the helical bodies of the elastic metal parts are coaxial and arranged in a ring array about the axis of the helix, the end of a single elastic metal part is connected to the end of an adjacent elastic metal part and finally closes the loop, the connecting section between two elastic metal parts is bent into a fan-shaped connecting lug along the direction perpendicular to the helical axis, the nut is slidably connected to the helical groove of the lead screw; an adapter, which sleeves the nut, and the connecting lugs at both ends of the nut are slidably sleeved with the two ends of the adapter, the adapter transmitting torque to the connecting lugs of the nut through a keyway on its outer wall.

[0008] As a preferred embodiment of the injection mold for the housing of an automotive water pump according to the present invention, wherein: one end of the lead screw is fixedly connected to a flange, which is fixedly connected to the outer wall of the moving mold through the flange, and the lead screw is parallel to the guide post of the moving mold.

[0009] As a preferred embodiment of the injection mold for the housing of an automotive water pump according to the present invention, wherein: a retaining ring is sleeved on both ends of the screw at the nut, and the connecting lugs at both ends of the nut abut against the retaining rings at the corresponding positions.

[0010] As a preferred embodiment of the injection mold for the housing of an automotive water pump according to the present invention, wherein: a pressure plate is arranged in a circular array between the two retaining rings about the lead screw, the cross section of the pressure plate is arc-shaped, and the arc axis of the pressure plate is coaxial with the lead screw, one end of the pressure plate is fixedly inserted into the retaining ring, and the other end of the pressure plate is slidably inserted into another retaining ring, and the pressure plate presses a nut.

[0011] As a preferred embodiment of the injection mold for the housing of an automotive water pump according to the present invention, wherein: a retaining spring is engaged between one end of the slidingly inserted pressure plate, and a compression spring is sleeved between the retaining spring and the retaining ring on the pressure plate.

[0012] As a preferred embodiment of the injection mold for the housing of an automotive water pump according to the present invention, wherein: the depth of the spiral groove of the lead screw is greater than the spiral diameter of the metal part of the nut, and when the nut is located in the middle section of the lead screw, the metal part slides at the bottom of the spiral groove of the lead screw, and when the nut is located at the end of the lead screw, the metal part slides at the opening of the spiral groove of the lead screw and abuts against the pressure plate.

[0013] As a preferred embodiment of the injection mold for the housing of an automotive water pump according to the present invention, wherein: the two ends of the adapter are connected to the inner wall of which are provided with sliding grooves, the connecting lug is slidably connected to the sliding groove along the axial direction of the adapter, and the retaining ring covers the opening of the sliding groove located on the end face of the adapter.

[0014] As a preferred embodiment of the injection mold for the housing of an automotive water pump according to the present invention, wherein: a hollow motor is sleeved on the outer wall of the adapter, and a square key is provided between the adapter and the inner wall of the outer rotor of the hollow motor, and the square key is symmetrically distributed about both ends of the adapter.

[0015] As a preferred embodiment of the injection mold for the housing of an automotive water pump according to the present invention, wherein: one end of the stator of the hollow motor is fixedly connected to a bracket, and the bracket is relatively stationary with respect to the fixed mold.

[0016] As a preferred embodiment of the injection mold for the housing of an automotive water pump according to the present invention, wherein: a protective cover is fixedly connected to the end of the bracket away from the moving mold, and one end of the lead screw is movably sleeved in the protective cover.

[0017] The beneficial effects of the injection mold for automotive water pump housing of the present invention are as follows: The injection mold for automotive water pump housing of the present invention realizes the use of ordinary motor drive without servo control to control the mold to run at different speeds at different stages of the mold opening and closing process. Ultimately, it achieves slow movement of the moving mold in the initial and final stages of mold closing, and fast movement of the moving mold when no slow movement is required. It can achieve the movement speed control of the moving mold with low equipment cost and simple use and maintenance difficulty. It solves the problem that the driving method of small and micro injection molds in the prior art, which achieves both rapid movement and delicate slow start control during the movement of the moving mold, has high equipment cost and high skill threshold for use and maintenance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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 effort.

[0019] Figure 1 This is a schematic diagram of the injection mold used for the housing of an automotive water pump.

[0020] Figure 2 for Figure 1 A schematic diagram of the assembly structure of the lead screw, nut, and hollow motor.

[0021] Figure 3 for Figure 2 A structural sectional view.

[0022] Figure 4 This is a schematic diagram of the assembly structure of the lead screw, nut, and pressure plate.

[0023] Figure 5 This is a disassembly diagram of the assembly structure of the lead screw, nut, and pressure plate.

[0024] Figure 6 This is a schematic diagram of the nut structure.

[0025] Figure 7 This is a sectional view of the assembly structure of the adapter and the hollow motor.

[0026] Figure 8 This is a schematic diagram of the adapter.

[0027] In the diagram: 100, fixed mold; 101, moving mold; 200, lead screw; 2001, flange; 201, nut; 2011, metal part; 2012, connecting lug; 202, adapter; 2021, slide groove; 203, retaining ring; 204, pressure plate; 205, snap ring; 206, spring; 300, hollow motor; 301, square key; 302, bracket; 303, protective cover. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Example, refer to Figures 1-8 This embodiment provides an injection mold for an automotive water pump housing, which enables control of the movement speed of the moving mold 101 with low equipment cost and simple use and maintenance.

[0030] like Figure 1 As shown, the present invention includes a fixed mold 100, a moving mold 101, and a lead screw 200 with one end fixedly connected to the moving mold 101. (Refer to...) Figure 5 The pitch of the helical groove of the lead screw 200 gradually decreases from the middle section to both ends; Reference Figure 6 The nut 201 is composed of an even number of helical elastic metal parts 2011, with the helical bodies of the elastic metal parts 2011 coaxial and arranged in a circular array about the axis of the helix. The end of a single elastic metal part 2011 connects to the end of an adjacent elastic metal part 2011 and eventually closes the loop. The connecting section between two elastic metal parts 2011 is bent into a fan-shaped connecting lug 2012 in the direction perpendicular to the helical axis. The nut 201 is slidably connected to the helical groove of the lead screw 200. (Reference) Figure 3 The adapter 202 is fitted onto the nut 201, and the connecting lugs 2012 at both ends of the nut 201 are slidably fitted onto both ends of the adapter 202, as shown in the reference. Figure 7 The adapter 202 transmits torque to the connecting lug 2012 of the nut 201 through the keyway on its outer wall; For details, please refer to Figure 1One end of the lead screw 200 is fixedly connected to a flange 2001, which is fixedly connected to the outer wall of the moving mold 101 through the flange 2001. The lead screw 200 is parallel to the guide post of the moving mold 101. (Refer to...) Figure 7 A hollow motor 300 is sleeved on the outer wall of the adapter 202, and a square key 301 is provided between the adapter 202 and the inner wall of the outer rotor of the hollow motor 300. The square keys 301 are symmetrically distributed about both ends of the adapter 202. (Refer to...) Figure 1 The stator of the hollow motor 300 is fixedly connected to a bracket 302, and the bracket 302 is relatively stationary with respect to the fixed mold 100. The end of the bracket 302 away from the moving mold 101 is fixedly connected to a protective cover 303, and one end of the lead screw 200 is movably sleeved in the protective cover 303.

[0031] This invention provides an injection mold for an automotive water pump housing, primarily offering a control function for the mold opening and closing actions. This function, driven by a non-servo-controlled conventional motor, controls the mold to operate at different speeds during different stages of the opening and closing processes. Ultimately, the moving mold 101 moves slowly during the initial and final stages of mold closing, and moves rapidly when no slow movement is required. This function mainly relies on a nut 201 composed of a variable-pitch lead screw 200 and a cage-like elastic metal component 2011. (Refer to...) Figure 6 The special spiral cage-shaped elastic nut 201 design enables the nut 201 to adapt to different pitches at different parts of the lead screw 200. Thus, when the lead screw 200 rotates at a constant speed at the designed speed, the nut 201 can obtain different movement speeds and corresponding push (pull) forces when it moves to different positions of the lead screw 200. The working process is as follows: the hollow motor 300 drives the adapter 202 to rotate, and the adapter 202 drives the connecting ear 2012 to rotate through the slide groove 2021. The nut 201 rotates relative to the lead screw 200 and drives the lead screw 200 to move along its axis through the spiral structure. Obviously, when the mold is in the initial stage of mold opening, the nut 201 is located at the end of the lead screw 200 where the spiral groove pitch is relatively small. At this time, the component force generated by the rotation of the nut 201 on the axis of the lead screw 200 is large, and the speed of driving the lead screw 200 to move is relatively slow. This meets the requirements of "strong force", "slow movement" and "delicate motion control" when the mold is opening. The same applies when the mold is closing. In the intermediate state between mold closing and mold opening, the position of the nut 201 corresponds to the middle section of the lead screw 200 where the spiral groove pitch is larger, so that the moving mold 101 runs at a faster speed to ensure production efficiency.

[0032] This invention also relates to the following technical details: Firstly, the spiral cage-like structure of nut 201 provides further constraint; please refer to the structural reference. Figures 3-5A retaining ring 203 is sleeved on both ends of the screw 200 at the nut 201. The connecting ears 2012 at both ends of the nut 201 abut against the corresponding retaining rings 203. A pressure plate 204 is arranged in a ring array between the two retaining rings 203 about the screw 200. The cross section of the pressure plate 204 is arc-shaped, and the arc axis of the pressure plate 204 is coaxial with the screw 200. One end of the pressure plate 204 is fixedly inserted into the retaining ring 203, and the other end of the pressure plate 204 is slidably inserted into another retaining ring 203. The pressure plate 204 presses against the nut 201. The two ends of the adapter 202 are connected to the inner wall of which a sliding groove 2021 is opened. The connecting ears 2012 are slidably connected to the sliding groove 2021 along the axial direction of the adapter 202. The retaining ring 203 covers the opening of the sliding groove 2021 on the end face of the adapter 202. The main technical problem involves the risk that when torque is transmitted through the fan-shaped connector, the spiral metal part 2011 of the nut 201 may come out of the spiral groove of the lead screw 200, and the connecting lug 2012 may come out of the slide groove 2021 of the adapter 202. Therefore, a retaining ring 203 is used to cover both ends of the adapter 202, and a plug-in pressure plate 204 is used to cover one circumference of the nut 201 to avoid the nut 201 from disengaging when it is under force. Please refer to the structure. Figure 4 A retaining ring 205 is snapped between one end of the pressure plate 204 and the retaining ring 203. A compression spring 206 is sleeved between the pressure plate 204 and the retaining ring 203. By using the end of the pressure plate 204 that passes through the retaining ring 203 to assemble the retaining ring 205 and the spring 206, when assembling the nut 201 and the adapter 202, the spring 206 can first press the two retaining rings 203 onto both ends of the adapter 202, and at the same time press the connecting lug 2012 of the nut 201 into the slide groove 2021, so as to facilitate the assembly of the device.

[0033] Secondly, the helical structure of the nut 201 does not freely extend or compress; it is always controlled by the helical groove of the lead screw 200. That is, when the lead screw 200 with the variable pitch helical groove drives the moving mold 101 in conjunction with the nut 201 with the helical cage-like elastic structure, the structure that transmits torque remains rigid. Thirdly, the elastic helical structure of the nut 201, when stretched or compressed due to the change in the pitch of the helical groove of the screw 200, has a slight change in the diameter of its helix (the diameter of the helix decreases when stretched and increases when compressed). The helical groove of the screw 200 is reserved with an appropriate depth to accommodate this slight elastic deformation, but the helical diameter of the metal part 2011 does not change, and the groove width of the helical groove of the screw 200 does not change. Therefore, the structure for transmitting torque is still effective. Its assembly structure is as follows: the depth of the spiral groove of the lead screw 200 is greater than the spiral diameter of the metal part 2011 of the nut 201. When the nut 201 is located in the middle section of the lead screw 200, the metal part 2011 slides on the bottom of the spiral groove of the lead screw 200. When the nut 201 is located at the end of the lead screw 200, the metal part 2011 slides on the opening of the spiral groove of the lead screw 200 and abuts against the pressure plate 204.

[0034] The above working principle and structure, using a hollow motor 300 in the example, can make the structure more compact. Alternatively, a common internal rotor motor can be used to drive the mold via belt drive to replace the motor drive form in the example, which can further reduce the motor cost of the mold.

[0035] In summary, the present invention provides an injection mold for an automotive water pump housing, which achieves the use of a non-servo-controlled ordinary motor drive to control the mold to run at different speeds at different stages of the mold opening and closing process. Ultimately, the moving mold 101 moves slowly in the initial and final stages of mold closing, and moves rapidly when no slow movement is required. This invention achieves speed control of the moving mold 101 with low equipment cost and simple use and maintenance, solving the problem of high equipment cost and high skill threshold in the driving methods of existing small and micro injection molds that simultaneously achieve rapid movement and delicate slow start control during the movement of the moving mold 101.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An injection mold for an automotive water pump housing, comprising a fixed mold (100) and a moving mold (101), characterized in that, Also includes: The lead screw (200) is fixedly connected to the moving mold (101) at one end, and the pitch of its spiral groove gradually decreases from the middle section to both ends; The nut (201) is composed of an even number of helical elastic metal parts (2011), and the helical bodies of the elastic metal parts (2011) are coaxial and arranged in a ring array about the axis of the helix. The end of a single elastic metal part (2011) is connected to the end of an adjacent elastic metal part (2011) and finally closed. The connecting section between two elastic metal parts (2011) is bent into a fan-shaped connecting lug (2012) in the direction perpendicular to the helical axis. The nut (201) is slidably connected to the helical groove of the screw (200). The adapter (202) is fitted with a nut (201), and the connecting ears (2012) at both ends of the nut (201) are slidably fitted with the two ends of the adapter (202). The adapter (202) transmits torque to the connecting ears (2012) of the nut (201) through the keyway on the outer wall.

2. The injection mold for an automotive water pump housing as described in claim 1, characterized in that: One end of the lead screw (200) is fixedly connected to a flange (2001), which is fixedly connected to the outer wall of the moving mold (101) through the flange (2001), and the lead screw (200) is parallel to the guide post of the moving mold (101).

3. The injection mold for an automotive water pump housing as described in claim 1, characterized in that: The lead screw (200) has retaining rings (203) fitted at both ends of the nut (201), and the connecting lugs (2012) at both ends of the nut (201) abut against the retaining rings (203) at the corresponding positions.

4. The injection mold for an automotive water pump housing as described in claim 3, characterized in that: A pressure plate (204) is arranged in a ring array between the two retaining rings (203) about the lead screw (200). The cross-section of the pressure plate (204) is arc-shaped, and the arc axis of the pressure plate (204) is coaxial with the lead screw (200). One end of the pressure plate (204) is fixedly inserted into the retaining ring (203), and the other end of the pressure plate (204) is slidably inserted into the other retaining ring (203). The pressure plate (204) presses against the nut (201).

5. The injection mold for an automotive water pump housing as described in claim 4, characterized in that: A retaining ring (205) is engaged between one end of the pressure plate (204) and the retaining ring (203), and a compression spring (206) is sleeved between the retaining ring (205) and the retaining ring (203) of the pressure plate (204).

6. The injection mold for an automotive water pump housing as described in claim 5, characterized in that: The depth of the spiral groove of the lead screw (200) is greater than the spiral diameter of the metal part (2011) of the nut (201). When the nut (201) is located in the middle section of the lead screw (200), the metal part (2011) slides on the bottom of the spiral groove of the lead screw (200). When the nut (201) is located at the end of the lead screw (200), the metal part (2011) slides on the opening of the spiral groove of the lead screw (200) and abuts against the pressure plate (204).

7. The injection mold for an automotive water pump housing as described in claim 3, characterized in that: The two ends of the adapter (202) are connected to the inner wall of the adapter and a sliding groove (2021) is provided. The connecting ear (2012) is slidably connected to the sliding groove (2021) along the axial direction of the adapter (202). The retaining ring (203) covers the opening of the sliding groove (2021) on the end face of the adapter (202).

8. The injection mold for an automotive water pump housing as described in claim 1, characterized in that: The outer wall of the adapter (202) is fitted with a hollow motor (300), and a square key (301) is provided between the inner wall of the outer rotor of the adapter (202) and the hollow motor (300), and the square key (301) is symmetrically distributed about both ends of the adapter (202).

9. The injection mold for an automotive water pump housing as described in claim 8, characterized in that: The stator of the hollow motor (300) is fixedly connected to a bracket (302), and the bracket (302) is stationary relative to the fixed mold (100).

10. The injection mold for an automotive water pump housing as described in claim 9, characterized in that: The end of the bracket (302) away from the moving mold (101) is fixedly connected to a protective cover (303), and one end of the lead screw (200) is movably sleeved in the protective cover (303).

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