A drive wheel forming die for a garden tool

Abstract

The utility model relates to a kind of driving wheel forming die of garden tool, including mutually matched and respectively front and rear setting dynamic forming assembly and fixed forming assembly, dynamic forming assembly includes dynamic forming module, end plate fixed in the front side of dynamic forming module, and the clamping plate fixed between end plate and dynamic forming module, fixed forming assembly includes support module, bottom plate fixed in the back side of support module, and the ejection mechanism between bottom plate and support module;It also includes the die block embedded in the rear side inside of dynamic forming module, the inner core block fixed in the front side of support module, the core-pulling module fixed in the front side of support module, and two wheel hub forming assemblies distributed symmetrically on core-pulling module and on the left and right sides of inner core block;The utility model simplifies processing step to improve production efficiency, and ensure processing accuracy, also reduce production cost.

Description

Technical Field

[0001] This utility model relates to a mold for forming the drive wheel of a garden tool. Background Technology

[0002] Garden tools are equipment used for the maintenance of green landscapes. They mainly replace manual labor and realize mechanized operation. For easy movement, most garden tools are equipped with a power mechanism and have drive wheels and driven wheels for movement. The drive wheels are connected to the power mechanism to directly drive the garden tools to move. In order to facilitate processing and reduce costs, the drive wheels are usually made of plastic. Therefore, their injection molding process depends on the matching mold and the corresponding injection molding machine.

[0003] Because the drive wheel has a hole at its center for connecting to the shaft, the existing methods for machining this hole involve drilling it separately after the drive wheel has been injection molded. This makes the machining process cumbersome, resulting in low production efficiency. Furthermore, the drilling process causes significant positional errors in the hole, making it difficult to guarantee machining accuracy. In addition, the outer perimeter of the hole is solid, requiring a large amount of material and increasing production costs. Therefore, further improvements are needed. Utility Model Content

[0004] In view of the current state of the prior art, the technical problem to be solved by this utility model is to provide a garden tool drive wheel forming mold that simplifies the processing steps to improve production efficiency, ensures processing accuracy, and reduces material usage to lower production costs.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a driving wheel forming mold for garden tools, comprising a movable forming component and a fixed forming component that cooperate with each other and are respectively arranged front and rear. The movable forming component includes a movable forming module, an end plate fixed to the front side of the movable forming module, and a clamping plate fixed between the end plate and the movable forming module. The fixed forming component includes a support module, a base plate fixed to the rear side of the support module, and an ejection mechanism disposed between the base plate and the support module. The feature is that:

[0006] It also includes a mold core block embedded in the rear side of the dynamic forming module, an inner core block fixed in front of the support module, a core-pulling module fixed in front of the support module, and two wheel hub forming components set on the core-pulling module and symmetrically distributed on the left and right sides of the inner core block.

[0007] The wheel hub forming assembly includes a side slider movably connected to the front of the core-pulling module to have left and right translation function, and a core-pulling cylinder embedded and fixed inside the core-pulling module. The telescopic end of the core-pulling cylinder extends laterally to the outside of the core-pulling module and is fixed on the side slider.

[0008] It also includes a pin hole forming assembly that is mounted on the core-pulling module and cooperates with both wheel hub forming assemblies. The pin hole forming assembly includes a top slider that is movably connected to the front side of the core-pulling module to have the function of vertical movement, a pull rod that is inclinedly inserted into the top slider, and a core rod that is vertically inserted and fixed in the top slider. The front end of the pull rod is fixed on the moving forming module.

[0009] Preferably, a base is formed facing forward at the center of the end face of the inner core block, the end of the base passes through the core-pulling module and extends to the front of the core-pulling module, a stepped boss is formed facing forward at the center of the end face of the base, a forming boss is formed facing forward at the center of the end face of the stepped boss, and a bowl-shaped concave surface is formed on the end face of the forming boss. Correspondingly, a bowl-shaped convex surface that cooperates with the bowl-shaped concave surface is formed on the center of the end face of the mold core block in the direction of the inner core block.

[0010] Preferably, each of the two wheel hub forming assemblies has a symmetrically distributed semi-circular groove on the opposite outer wall of the side slider. Each of the two wheel hub forming assemblies also has a vertical groove on the opposite outer wall of the side slider that cooperates with the core rod and is located above the semi-circular groove. The upper and lower ends of the vertical groove are respectively connected to the upper outer wall of the side slider and the upper inner wall of the semi-circular groove.

[0011] Preferably, a plurality of spoke blocks are formed on the concave surface of the bowl facing the core block, and are evenly arranged at equal angles along the circumference. Correspondingly, the same number of partition blocks are formed on the convex surface of the bowl facing the inner core block, and are evenly arranged at equal angles along the circumference. A partition cavity is formed between any two adjacent spoke blocks, and each partition block cooperates with a corresponding partition cavity.

[0012] Preferably, a positioning protrusion is formed between the center of the bowl-shaped convex surface and the inner outer wall of each partition block. The outer wall of the positioning protrusion is provided with a plurality of forming grooves evenly arranged at equal angles along the circumferential direction. The number of forming grooves is equal to the number of partition blocks, and a forming groove is distributed between any two adjacent partition blocks.

[0013] Preferably, a shaft hole is provided between the end center of the positioning boss and the front outer wall of the mold core block. An end block is also embedded in the inner walls of the upper and lower sides of the rear opening of the shaft hole. The two end blocks are arranged diagonally opposite each other. A concentrically distributed shaft is also inserted in the shaft hole. A vertically arranged pin is fixed on the side of the two end blocks facing the shaft. The front end of the shaft is fixed on the moving forming module.

[0014] Preferably, the center of the bowl-shaped concave surface is provided with a countersunk hole that cooperates with the rear end of the shaft. The center of the bowl-shaped concave surface is also provided with a number of annular forming grooves that concentrically surround the opening of the countersunk hole from the inside out. Between the edge of the opening of the countersunk hole and the edge of the opening of the outermost annular forming groove, a number of rib grooves are provided that are evenly distributed at equal angles along the circumference.

[0015] Compared with the prior art, the advantages of this utility model are as follows: This utility model can form the shaft hole located at the center of the drive wheel at the same time as injection molding, so that there is no need to arrange a drilling process after injection molding, thereby simplifying the processing steps and improving production efficiency, and reducing the positional error of the shaft hole to ensure processing accuracy; in addition, multiple material-saving cavities can be generated around the shaft hole, thereby reducing the amount of material used and reducing production costs. Attached Figure Description

[0016] The above and other features, advantages, and aspects of the embodiments of this application will become more apparent when taken in conjunction with the accompanying drawings and the following detailed description; throughout the drawings, the same or similar reference numerals denote the same or similar elements; it should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale; in the drawings:

[0017] Figure 1 This is an exploded view of the right front side of this utility model;

[0018] Figure 2 This is a structural diagram of the right front side of the inner core block of this utility model;

[0019] Figure 3 This is a structural diagram of the left rear side of the mold core block of this utility model;

[0020] Figure 4 This is a structural diagram of the right front side of the side slider of this utility model;

[0021] Figure 5 This is a structural diagram of the left rear side of the pin hole forming component of this utility model. Detailed Implementation

[0022] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0024] like Figures 1-5 As shown, a driving wheel forming mold for a garden tool includes a movable forming component and a fixed forming component that cooperate with each other and are respectively arranged in front and behind. The movable forming component includes a movable forming module 1, an end plate 10 fixed to the front side of the movable forming module 1, and a clamping plate 11 fixed between the end plate 10 and the movable forming module 1. The fixed forming component includes a support module 3, a base plate 4 fixed to the rear side of the support module 3, and an ejection mechanism 5 disposed between the base plate 4 and the support module 3.

[0025] It also includes a mold core block 6 embedded in the rear side of the dynamic forming module 1, an inner core block 8 fixed in front of the support module 3, a core-pulling module 2 fixed in front of the support module 3, and two wheel hub forming components 9 set on the core-pulling module 2 and symmetrically distributed on the left and right sides of the inner core block 8.

[0026] The wheel hub forming assembly 9 includes a side slider 91 movably connected to the front side of the core-pulling module 2 to have a left and right translation function, and a core-pulling cylinder 92 embedded and fixed inside the core-pulling module 2. The telescopic end of the core-pulling cylinder 92 extends laterally to the outside of the core-pulling module 2 and is fixed on the side slider 91.

[0027] It also includes a pin hole forming component 7, which is provided on the core-pulling module 2 and cooperates with both wheel hub forming components 9. The pin hole forming component 7 includes a top slider 71 movably connected to the front side of the core-pulling module 2 to have the function of vertical movement, a pull rod 72 obliquely inserted in the top slider 71, and a core rod 73 vertically inserted and fixed in the top slider 71. The front end of the pull rod 72 is fixed on the moving forming module 1.

[0028] A base 81 is formed facing forward at the center of the end face of the inner core block 8. The end of the base 81 passes through the core-pulling module 2 and extends to the front of the core-pulling module 2. A stepped boss 82 is formed facing forward at the center of the end face of the base 81. A forming boss 83 is formed facing forward at the center of the end face of the stepped boss 82. A bowl-shaped concave surface 88 is formed on the end face of the forming boss 83. Correspondingly, a bowl-shaped convex surface 61 that cooperates with the bowl-shaped concave surface 88 is formed on the center of the end face of the mold core block 6 in the direction of the inner core block 8.

[0029] Each of the two wheel hub forming assemblies 9 has a symmetrically distributed semi-circular groove 911 on the opposite outer wall of the side slider 91. Each of the two wheel hub forming assemblies 9 also has a vertical groove 915 that cooperates with the core rod 73 and is located above the semi-circular groove 911 on the opposite outer wall of the side slider 91. The upper and lower ends of the vertical groove 915 are respectively connected to the upper outer wall of the side slider 91 and the upper inner wall of the semi-circular groove 911.

[0030] A semicircular inclined surface 912 is formed on the front edge of the opening of the semicircular groove 911. A semicircular notch 913 is provided on the semicircular inclined surface 912. A semicircular groove 914 is formed on the rear edge of the opening of the semicircular groove 911. The semicircular inclined surface 912, the semicircular notch 913 and the semicircular groove 914 all cooperate with the outer wall of the stepped boss 82.

[0031] On the concave surface 88 of the bowl, a plurality of spoke blocks 84 are formed at equal angles along the circumference towards the core block 6. Correspondingly, on the convex surface 61 of the bowl, the same number of partition blocks 62 are formed at equal angles along the circumference towards the inner core block 8. A partition cavity 85 is formed between any two adjacent spoke blocks 84. Each partition block 62 cooperates with a corresponding partition cavity 85.

[0032] A positioning protrusion 63 is formed between the center of the bowl-shaped convex surface 61 and the inner outer wall of each partition block 62. Multiple forming grooves 64 are evenly arranged at equal angles along the circumferential direction on the outer wall of the positioning protrusion 63. The number of forming grooves 64 is equal to the number of partition blocks 62. A forming groove 64 is distributed between any two adjacent partition blocks 62.

[0033] A shaft hole 65 is provided between the end center of the positioning boss 63 and the front outer wall of the mold core block 6. An end block 12 is also embedded in the inner walls of the upper and lower sides of the rear opening of the shaft hole 65. The two end blocks 12 are diagonally arranged. A concentrically distributed shaft rod 14 is also inserted in the shaft hole 65. A vertically arranged pin 13 is fixed on the side of the two end blocks 12 facing the shaft rod 14. The front end of the shaft rod 14 is fixed on the moving forming module 1.

[0034] A limiting notch 87 is provided on the upper edge of the end face of the forming boss 83. Correspondingly, a limiting protrusion 66 is formed on the upper edge of the bowl-shaped convex surface 61 in the direction of the inner core block 8, which cooperates with the limiting notch 87.

[0035] Each spoke block 84 has a radially distributed first partition groove 86 on the outer wall of the side facing the mold core block 6, and each first partition groove 86 has a second partition groove 89 concentrically distributed with the forming boss 83 in the middle.

[0036] The center of the bowl-shaped concave surface 88 is provided with a countersunk hole 810 that cooperates with the rear end of the shaft 14. The center of the bowl-shaped concave surface 88 is also provided with several annular forming grooves 811 that are concentrically arranged around the opening of the countersunk hole 810 from the inside out. Between the edge of the opening of the countersunk hole 810 and the edge of the opening of the outermost annular forming groove 811, there are several rib grooves 812 that are evenly distributed at equal angles along the circumference.

[0037] Working principle:

[0038] The end plate 10 of the moving molding assembly is installed on the action mechanism of the injection molding machine, and the base plate 4 is installed on the body of the injection molding machine. The action mechanism is operated to drive the end plate 10 to move backward, and then the moving molding module 1 is driven to move synchronously with the help of the clamping plate 11 until the rear outer wall of the moving molding module 1 and the front outer wall of the core pulling module 2 are joined together (existing technology).

[0039] During the movement of the dynamic forming module 1, the pull rod 72 in the pin hole forming assembly 7 moves synchronously, thereby forcing the top slider 71 to move downward, which in turn drives the core rod 73 to move synchronously. Subsequently, the telescopic ends of the core-pulling cylinder 92 in each drive hub forming assembly 9 retract inward, thereby driving each side slider 91 to move towards the inner core block 8, until the opposite outer walls of the side sliders 91 in the two hub forming assemblies 9 fit together, and the openings of the semi-circular grooves 911 on the two side sliders 91 are joined together and evenly aligned. The openings of the semicircular inclined surfaces 912 on the two side sliders 91 are joined together and surround the outer side of the formed boss 83. The openings of the semicircular notches 913 on the two side sliders 91 are joined together and surround the outer periphery of the bowl-shaped concave surface 88. The openings of the semicircular grooves 914 on the two side sliders 91 are joined together and surround the outer side of the root of the stepped boss 82. The openings of the vertical grooves 915 on the two side sliders 91 are also joined together and wrap around the core rod 73.

[0040] After the rear outer wall of the dynamic forming module 1 and the front outer wall of the core-pulling module 2 are joined together, the bowl-shaped convex surface 61 on the core block 6 fits onto the bowl-shaped concave surface 88 on the inner core block 8. Each spoke block 84 extends into the two corresponding and adjacent partition blocks 62, and each partition block 62 extends into a corresponding partition cavity 85. The rear end of the shaft 14 is also concentrically inserted into the countersunk hole 810 in the two inner core-pulling modules.

[0041] Subsequently, the molten material enters the space between the bowl-shaped convex surface 61 and the bowl-shaped concave surface 88 and between the two side sliders 91 and the stepped boss 82 through the gate provided in the end plate 10 and the sprue provided in the moving forming module 1. After cooling, the drive wheel is formed (existing technology).

[0042] Then, the action mechanism drives the forming module 1 to move forward to leave the core-pulling module 2, and then similarly drives the core rod 73 to move upward and reset. Then, the telescopic ends of the two core-pulling cylinders 92 are driven to extend outward to drive each side slider 91 to move away from the inner core block 8. Finally, the ejection mechanism 5 pushes the formed drive wheel forward (existing technology).

[0043] This invention can simultaneously form the shaft hole located at the center of the drive wheel during injection molding, thus eliminating the need for a separate drilling process after injection molding. This simplifies the processing steps, improves production efficiency, and reduces the positional error of the shaft hole to ensure processing accuracy. In addition, multiple material-saving cavities can be generated around the shaft hole, thereby reducing material usage and lowering production costs.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A mold for forming a drive wheel of a garden tool, comprising a movable forming component and a fixed forming component that cooperate with each other and are respectively arranged front and rear. The movable forming component includes a movable forming module, an end plate fixed to the front side of the movable forming module, and a clamping plate fixed between the end plate and the movable forming module. The fixed forming component includes a support module, a base plate fixed to the rear side of the support module, and an ejection mechanism disposed between the base plate and the support module. The mold is characterized in that: It also includes a mold core block embedded in the rear side of the dynamic forming module, an inner core block fixed in front of the support module, a core-pulling module fixed in front of the support module, and two wheel hub forming components set on the core-pulling module and symmetrically distributed on the left and right sides of the inner core block. The wheel hub forming assembly includes a side slider movably connected to the front of the core-pulling module to have left and right translation function, and a core-pulling cylinder embedded and fixed inside the core-pulling module. The telescopic end of the core-pulling cylinder extends laterally to the outside of the core-pulling module and is fixed on the side slider. It also includes a pin hole forming assembly that is mounted on the core-pulling module and cooperates with both wheel hub forming assemblies. The pin hole forming assembly includes a top slider that is movably connected to the front side of the core-pulling module to have the function of vertical movement, a pull rod that is inclinedly inserted into the top slider, and a core rod that is vertically inserted and fixed in the top slider. The front end of the pull rod is fixed on the moving forming module.

2. The driving wheel forming mold for a garden tool according to claim 1, characterized in that, The inner core block has a base formed facing forward at the center of its end face. The end of the base passes through the core-pulling module and extends to the front of the core-pulling module. The center of the end face of the base has a stepped boss formed facing forward. The center of the end face of the stepped boss has a forming boss formed facing forward. The end face of the forming boss has a bowl-shaped concave surface. Correspondingly, the center of the end face of the mold core block has a bowl-shaped convex surface that cooperates with the bowl-shaped concave surface in the direction of the inner core block.

3. The driving wheel forming mold for a garden tool according to claim 2, characterized in that, Each of the two wheel hub forming assemblies has a symmetrically distributed semi-circular groove on the opposite outer wall of the side slider. Each of the two wheel hub forming assemblies also has a vertical groove on the opposite outer wall of the side slider that cooperates with the core rod and is located above the semi-circular groove. The upper and lower ends of the vertical groove are respectively connected to the upper outer wall of the side slider and the upper inner wall of the semi-circular groove.

4. The driving wheel forming mold for a garden tool according to claim 2, characterized in that, On the concave surface of the bowl, a plurality of spoke blocks are formed at equal angles along the circumference towards the core block. Correspondingly, on the convex surface of the bowl, the same number of partition blocks are formed at equal angles along the circumference towards the inner core block. A partition cavity is formed between any two adjacent spoke blocks, and each partition block cooperates with a corresponding partition cavity.

5. The driving wheel forming mold for a garden tool according to claim 4, characterized in that, A positioning protrusion is formed between the center of the bowl-shaped convex surface and the inner outer wall of each partition block. Multiple forming grooves are evenly arranged at equal angles along the circumferential direction on the outer wall of the positioning protrusion. The number of forming grooves is equal to the number of partition blocks, and a forming groove is distributed between any two adjacent partition blocks.

6. The driving wheel forming mold for a garden tool according to claim 5, characterized in that, A shaft hole is provided between the center of the end of the positioning boss and the front outer wall of the mold core block. An end block is also embedded in the inner wall of the upper and lower sides of the rear opening of the shaft hole. The two end blocks are arranged diagonally opposite each other. A concentrically distributed shaft is also inserted in the shaft hole. A vertically arranged pin is fixed on the side of the two end blocks facing the shaft. The front end of the shaft is fixed on the moving forming module.

7. The driving wheel forming mold for a garden tool according to claim 6, characterized in that, The center of the bowl-shaped concave surface is provided with a countersunk hole that cooperates with the rear end of the shaft. The center of the bowl-shaped concave surface is also provided with several annular forming grooves that are concentrically arranged around the opening of the countersunk hole from the inside out. Between the edge of the opening of the countersunk hole and the edge of the opening of the outermost annular forming groove, there are multiple rib grooves that are evenly distributed at equal angles along the circumference.

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