A tooth reaming die for preventing tooth shaft from falling back

Abstract

The utility model discloses a hinged tooth mold that can prevent the tooth shaft from falling back, and belongs to the technical field of molds. A hinged tooth mold that can prevent the tooth shaft from falling back comprises: a machine body, on which an upper tooth shaft is installed; a first driving member, which is installed in the machine body, and the first driving member is used to drive the upper tooth shaft to rotate; a top column, which is slidably installed in the machine body, and an elastic member is installed between the top column and the machine body. After the first driving member drives the upper tooth shaft to rotate and separate from the product, the top column lifts up the upper tooth shaft under the action of the elastic member, and the elastic force of the elastic member is balanced with the gravity of the upper tooth shaft, so that the upper tooth shaft will not fall back due to its own weight, resulting in crushing, scratching and damage to the product, thereby ensuring the manufacturability and stability of the mold and achieving the effect of improving product quality. After the upper tooth shaft is lifted up, the end position of the upper tooth shaft can be separated from the internal range of the product, so that the product can be directly ejected through structures such as ejectors, thereby improving product production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a tooth reaming mold capable of preventing a tooth shaft from falling back. Background Art

[0002] In the injection molding of plastic products, some plastic products have threads inside, and need to be made by injection molding using a reamed mold with a threaded shaft. For example, in the production of the adsorption column body, both ends of the adsorption column have threads, and an outer mold, upper and lower threaded shafts, and core pulling structures are required. After molding, the outer mold is opened, and the upper threaded shaft needs to be rotated away from the product before the upper threaded shaft and the core pulling can be pulled out of the product. The lower threaded shaft is unscrewed from the bottom of the product, and then the product is ejected by the ejector pin.

[0003] In order to adapt to the pitch of the product, the tooth axis is driven to rotate by the driving member, and the tooth axis and the driving member can slide relative to each other along the axis. After the product is formed, when the driving member drives the upper tooth axis to rotate, due to the effect of the product thread, the upper tooth axis will move upward along the axis and detach from the product's thread structure. However, after the upper tooth axis detaches from the product, it will fall back downward due to inertia and its own gravity and hit the product, making the product easily damaged, which is not conducive to production. Utility Model Content

[0004] The utility model aims to provide a tooth reaming die capable of preventing the tooth shaft from falling back, so as to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The technical solution adopted to solve the above-mentioned technical problems is: a tooth-reaming mold for preventing the tooth shaft from falling back, comprising: a body, on which an upper tooth shaft is installed, an injection cavity is formed between the body and the upper tooth shaft; a first driving member, installed in the body, the first driving member is used to drive the upper tooth shaft to rotate; a top column, slidably installed in the body along the direction of the rotation center line of the upper tooth shaft, an elastic member is installed between the top column and the body, and the elastic member provides an elastic force to press the top column against the bottom of the upper tooth shaft.

[0006] This technical solution has at least the following beneficial effects: after the product is formed by injection molding in the injection molding cavity, the first driving member drives the upper tooth shaft to rotate until it is separated from the product. Under the action of the elastic member, the top column contacts the bottom of the upper tooth shaft to lift the upper tooth shaft. The elastic force of the elastic member is balanced with the gravity of the upper tooth shaft, so that the upper tooth shaft will not fall back due to its own weight, resulting in crushing, scratching and damage to the product, thereby ensuring the manufacturability and stability of the mold and achieving the effect of improving product quality. After lifting the upper tooth shaft, the end position of the upper tooth shaft can be separated from the internal range of the product, so that the product can be directly ejected through structures such as ejectors, thereby improving product production efficiency; in addition, the elastic force of the elastic member can also assist the upper tooth shaft to leave the internal range of the product, reduce the role of the product thread structure, better protect the product thread structure, and produce better quality products.

[0007] As a further improvement of the above technical solution, the machine body is provided with a mounting hole for the top column to be embedded, the elastic member is in the mounting hole, and the machine body is provided with a mounting block for limiting the top column from being separated from the mounting hole, so as to facilitate assembly and disassembly of the top column and the elastic member for maintenance and replacement.

[0008] As a further improvement of the above technical solution, a guide ring embedded in the mounting hole is installed at one end of the top column, the diameter of the top column is smaller than the diameter of the guide ring, and the top column is passed through the mounting block. The mounting block can limit the guide ring so that the guide ring cannot be separated from the mounting hole, and then the top column cannot be separated from the mounting hole, thereby ensuring the reliability of the top column. At the same time, the mounting block can limit the sliding direction of the top column, making the sliding of the top column more stable and reliable.

[0009] As a further improvement of the above technical solution, the diameter of the mounting block is larger than the diameter of the mounting hole, and the machine body is provided with a clearance groove for the mounting block to be inserted at one end of the mounting hole. The clearance groove can locate the installation position of the mounting block, so as to facilitate the installation and removal of the top column and the mounting block, thereby improving the efficiency of maintenance and repair. Moreover, the diameter of the mounting block is larger than the diameter of the mounting hole, which can facilitate the installation of the mounting block on the machine body through mounting parts such as bolts, thereby ensuring the installation stability of the mounting block.

[0010] As a further improvement of the above technical solution, the machine body is equipped with an upper insert, an injection cavity is formed between the upper insert, the upper tooth shaft and the machine body, the upper insert is sleeved outside the upper tooth shaft, the top column is installed on the upper insert, and an outer edge for the top column to abut is installed outside the upper tooth shaft. The upper insert can simplify the structure corresponding to the injection cavity formed by the machine body, and can also facilitate the replacement and maintenance of the side wall structure of the injection cavity corresponding to the upper insert; the top column is installed at the upper insert, which can facilitate the assembly of the top column, reduce production costs, and improve economic efficiency.

[0011] As a further improvement of the above technical solution, the elastic member is a coil spring, and the two ends of the coil spring are respectively against the body and the top column. The coil spring can provide a relatively stable and large elastic force to support the upper tooth axis, and is easy to install, low in cost, and good in economy.

[0012] As a further improvement of the above technical solution, a ball bearing is installed on one end of the top column against the upper tooth shaft. The ball bearing can reduce the friction between the top column and the upper tooth shaft, reduce the damage of the top displacement under long-term use, ensure the stability of the top displacement of the upper tooth shaft after long-term use, and also have the advantages of ensuring the stability of the top column when it is stressed and reducing friction noise.

[0013] As a further improvement of the above technical solution, the top column can rotate around its own axis. When the upper tooth shaft rotates to separate from the product, the top of the top column and the bottom of the upper tooth shaft slide relative to each other to generate friction. If the point of action of the friction between the end of the top column and the upper tooth shaft is not directly above the top column due to frequent friction or production size deviation, the self-rotation of the top column can offset the torque generated by the friction on the top column, so that the top column is not easily damaged, and the stability and reliability of the top column are better guaranteed.

[0014] As a further improvement of the above technical solution, a rotating bearing is installed between the top column and the machine body. The rotating bearing can reduce the friction between the top column and the machine body during relative rotation, ensuring that the top column has less wear and reliable sliding stability after long-term use.

[0015] As a further improvement of the above technical solution, the first driving member includes a power member, a driving gear and a driven gear meshing with the driving gear, the power member is installed on the machine body, the driving gear and the driven gear are respectively rotatably installed on the machine body, the power member is used to drive the driving gear to rotate, the upper tooth shaft is connected to the driven gear, and the upper tooth shaft can slide axially relative to the driven gear. The power member drives the driving gear to rotate, thereby driving the driven gear and the upper tooth shaft to rotate. The upper tooth shaft moves axially along the rotation center line driven by the product thread, so that the upper tooth shaft can be separated from the product; in addition, the product thread only assists the upper tooth shaft to move, the overall mass of the upper tooth shaft is relatively light, and the impact on the product's thread structure is small, which can better ensure the product's thread quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the embodiment of the utility model when the upper tooth axis has not separated from the product;

[0018] Figure 2This is a schematic diagram of the cross-sectional structure of the upper tooth axis when it is separated from the product in the embodiment of the utility model;

[0019] Figure 3 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0020] Figure 4 for Figure 2 A magnified schematic diagram of point B in the middle.

[0021] Bracket 11, inner mold 12, core pulling 13, upper tooth shaft 20, first driving member 30, power member 31, driving gear 32, driven gear 33, top column 40, rotating bearing 41, ball 42, elastic member 50, mounting hole 60, mounting block 61, bolt 62, guide ring 63, make way groove 64, upper insert 70, lower insert 71, outer edge 80, slider 81, inclined guide column 82. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] Reference Figure 1-4A tooth-reaming mold for preventing the tooth axis from falling back comprises a machine body, which comprises a bracket, a movable outer mold (not shown in the figure), an inner mold 12 and a core puller 13. The bracket is in a vertical state, the movable outer mold and the inner mold 12 are located at two sides, the core puller 13 is located between the movable outer mold and the inner mold 12, an upper tooth axis 20 is arranged on the upper side of the bracket, and a lower tooth axis is arranged on the lower side of the bracket. The outer side of the core puller 13, the inner side of the movable outer mold and the inner mold 12, and the upper tooth axis 20 and the lower tooth axis on both sides constitute an injection cavity, and the machine body is also provided with an injection channel connected to the injection cavity, and the plastic liquid is injected into the injection cavity from the injection channel through the injection molding device, and a product can be formed after molding. Before taking out the product, it is necessary to open the movable outer mold, separate the upper tooth axis 20 and the core puller 13 from the upper side of the product range, separate the lower tooth axis from the lower side of the product range, and a ejector is arranged on one side of the inner mold 12, and the molded product is ejected from one side through the ejector.

[0027] The upper tooth shaft 20 and the lower tooth shaft need to be out of the product range by screwing out, so a first driving member 30 is installed on the top of the bracket 11. The first driving member 30 includes a power member 31 installed on the bracket 11. The first driving member 30 also includes a driving gear 32 and a driven gear 33 rotatably installed on the bracket 11, and the driving gear 32 and the driven gear 33 are on the same horizontal plane and meshed with each other. The output end of the power member 31 is transmission-connected with the driving gear 32, and the power member 31 can drive the driving gear 32 to rotate. Among them, the power member 31 is a motor, and the output end of the motor is coaxially transmission-connected with the driving gear 32, so that the motor can drive the driving gear 32 to rotate. A sliding hole is opened in the middle of the driven gear 33, and the upper tooth shaft 20 is slidably inserted into the sliding hole, so that the upper tooth shaft 20 can slide relative to the driven gear 33 along the axis.

[0028] The outer side of the upper tooth shaft 20 is provided with a protrusion, and the side wall of the sliding hole of the driven gear 33 is provided with a sliding groove. The protrusion is embedded in the sliding groove and can slide in the sliding groove along the axis direction of the upper tooth shaft 20, so that when the driven gear 33 rotates, the upper tooth shaft 20 can be driven to rotate, and the upper tooth shaft 20 can slide up and down along the direction of the rotation center line, that is, the driven gear 33 does not hinder the upper tooth shaft 20 from sliding up and down. In other embodiments, the protrusion can also be provided on the inner side of the driven gear 33, and the sliding groove can be provided on the outer side of the upper tooth shaft 20, and the protrusion can slide in the sliding groove along the axis direction of the upper tooth shaft 20. When the power member 31 drives the driving gear 32 to rotate, it can drive the driven gear 33 to rotate, and then drive the upper tooth shaft 20 to rotate. Under the action of the product thread, the upper tooth shaft 20 moves upward along the rotation center line to leave the range of the product.

[0029] The lower tooth axis can also be driven out of the range of the product by installing another first driving member 30. Since the upper tooth axis 20 and the lower tooth axis can be movably arranged, during injection molding, it is necessary to separately provide a slider 81 to fix the upper tooth axis 20 and the lower tooth axis during injection molding to ensure the injection molding. Specifically, an inclined guide column 82 and a corresponding second driving member can be provided on the bracket 11, and the outer sides of the upper tooth axis 20 and the lower tooth axis are correspondingly provided with an outer edge 80. The second driving member drives the inclined guide column 82 to move horizontally, thereby driving the slider 81 to move up and down. During injection molding, the slider 81 can be used to press the upper tooth axis 20 and the lower tooth axis to the corresponding position. After the injection molding is completed, the slider 81 is removed to unlock the fixation of the upper tooth axis 20 and the lower tooth axis to ensure that the upper tooth axis 20 and the lower tooth axis can smoothly get out of the product range, and then the product is ejected.

[0030] In order to simplify the structure of the outer mold and the inner mold 12, an upper insert 70 is installed at the top of the bracket 11, and the upper insert 70 is sleeved on the outer side of the bottom of the upper tooth axis 20; a lower insert 71 is installed at the bottom of the bracket 11, and the lower insert 71 is sleeved on the outer side of the lower tooth axis.

[0031] The injection cavity is surrounded by one side of the inner mold 12, one side of the outer mold, the outside of the core pull 13, the bottom of the upper tooth axis 20, the bottom wall of the upper insert 70, the top of the lower tooth axis, and the top wall of the lower insert 71. A top column 40 is installed on the top of the upper insert 70, and one, two or more top columns 40 can be arranged around the outside of the upper tooth axis 20. The upper insert 70 is provided with mounting holes 60 corresponding to the top columns 40 one by one, and the depth direction of the mounting holes 60 is parallel to the rotation center line direction of the upper tooth axis 20. The top column 40 is slidably arranged in the corresponding mounting hole, and an elastic member 50 is installed between the top column 40 and the body. The elastic member 50 is a coil spring, one end of the coil spring abuts against one end of the top column 40, and the other end abuts against the bottom wall of the mounting hole 60, so that the coil spring can provide elastic force to push the top column 40 upward to lift the upper tooth axis 20. The top end of the top column 40 away from the coil spring, ie, the top, abuts against the bottom wall of the outer edge 80 of the outer side of the upper tooth shaft 20, so that the elastic force provided by the coil spring is opposite to the gravity direction of the upper tooth shaft 20.

[0032] During injection molding, the upper slider 81 presses against the outer edge 80 of the upper tooth shaft 20, so that the top column 40 overcomes the elastic force of the coil spring and retracts into the mounting hole 60. The top column 40 will not affect the injection molding process. After the injection molding is completed, the upper slider 81 is moved away without pressing against the upper tooth shaft 20. The upper tooth shaft 20 is driven to rotate by the power member 31, so that the upper tooth shaft 20 can move upward under the action of the product thread. At this time, the top column 40 also moves upward under the action of the coil spring and supports the upper tooth shaft 20. The elastic force of the coil spring can also help the upper tooth shaft 20 move upward. When the upper tooth shaft 20 is separated from the product, due to the support of the coil spring, the top column 40 supports the upper tooth shaft 20 and keeps it out of the product range, so that the upper tooth shaft 20 will not fall back due to its own weight and damage the product.

[0033] It should be noted that the elastic expansion and contraction range of the coil spring, i.e., the length of the ejection of the top column 40, needs to be greater than the axial displacement of the upper tooth axis 20 when it is removed from the product. If the thickness of the upper insert 70 is not enough to install the coil spring, the bottom of the mounting hole 60 can pass through the bottom of the upper insert 70 and extend into the inner mold 12 or the bracket 11. One end of the coil spring abuts against the top column 40, and the other end abuts against the corresponding inner mold 12 or the bracket 11, thereby ensuring that the top column 40 can support the upper tooth axis 20 to a position that leaves the product range. In other embodiments, a receiving groove that can accommodate the coil spring can also be opened at the bottom of the top column 40. When the coil spring is compressed to the extreme, the coil spring is just completely in the receiving groove, and the bottom of the top column 40 just touches the bottom wall of the mounting hole 60, thereby reducing the depth of the mounting hole 60.

[0034] The top column 40 is cylindrical, and a cylindrical guide ring 63 is installed at the bottom of the top column 40. The diameter of the guide ring 63 is the same as the diameter of the mounting hole 60. The diameter of the top column 40 is smaller than the diameter of the mounting hole 60. A rotating bearing 41 is sleeved on the outside of the top column 40. The rotating bearing 41 can be a ball bearing or a needle bearing. The inner side of the rotating bearing 41 is clamped at one end of the top column 40 close to the guide ring 63, and the outer side of the rotating bearing 41 is in contact with the inner wall of the mounting hole 60. Thus, the top column 40 can rotate around its own axis. When the top of the top column 40 is subjected to an unbalanced force, it can offset the external force by self-rotation, thereby better ensuring the installation stability of the top column 40.

[0035] Mounting blocks 61 are installed one by one at positions corresponding to the mounting holes 60 of the upper insert 70, and the top column 40 is installed on the corresponding mounting blocks 61. The diameter of the mounting block 61 is larger than the diameter of the mounting hole 60, and a clearance groove 64 for the mounting block 61 to be inserted is opened at the top position of the upper insert 70 corresponding to the mounting hole 60. The depth of the clearance groove 64 is adapted to the thickness of the mounting block 61, so that the top surface of the mounting block 61 is flush with the top surface of the upper insert 70 or the top surface of the mounting block 61 is slightly lower than the top surface of the upper insert 70. The mounting block 61 can prevent the guide ring 63 from escaping from the mounting hole 60. Bolts 62 are installed on both sides of the mounting block 61, and the ends of the bolts 62 are screwed into the upper insert 70, so that the mounting block 61 can be stably installed in the upper insert 70, and at the same time, it can also facilitate the installation and removal of the mounting block 61.

[0036] A ball 42 is installed at one end of the top column 40 away from the coil spring. The top column 40 is pressed against the bottom wall of the outer edge 80 of the upper tooth shaft 20 through the ball 42. By setting the ball 42, the friction between the top column 40 and the upper tooth shaft 20 can be reduced, thereby ensuring the stability of the support of the top column 40.

[0037] In other embodiments, the elastic member 50 may also be an elastic sheet, which is arranged in an arc shape, the middle part of the elastic sheet is fixedly connected to the bottom of the top column 40, the two ends of the elastic sheet abut and can slide on the bottom wall of the mounting hole 60, and triangular grooves may be provided on both sides of the bottom wall of the mounting hole 60 for the ends of the elastic sheet to move. During injection molding, the top column 40 is abutted by the upper tooth axis 20, so that the elastic sheet is compressed to a nearly horizontal state. After the injection molding is completed, when the upper tooth axis 20 moves upward, the two ends of the elastic sheet slide toward the middle part and restore the deformation, so that the middle part bounces up and supports the top column 40 to lift the upper tooth axis 20 upward, thereby realizing the function of preventing the upper tooth axis 20 from falling back.

[0038] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A tooth reaming mold for preventing the tooth shaft from falling back, characterized in that: include: A machine body is provided with an upper tooth shaft, and an injection molding cavity is formed between the machine body and the upper tooth shaft; A first driving member, mounted on the machine body, and used to drive the upper tooth shaft to rotate; A top column is slidably mounted on the machine body along the rotation center line direction of the upper tooth axis. An elastic member is installed between the top column and the machine body. The elastic member provides elastic force to push the top column against the bottom of the upper tooth axis.

2. A tooth reaming mold for preventing the tooth shaft from falling back according to claim 1, characterized in that: The machine body is provided with a mounting hole for the top column to be embedded, the elastic member is located in the mounting hole, and the machine body is provided with a mounting block for limiting the top column from being separated from the mounting hole.

3. A tooth reaming mold for preventing the tooth shaft from falling back according to claim 2, characterized in that: A guide ring embedded in the mounting hole is installed at one end of the top column, the diameter of the top column is smaller than the diameter of the guide ring, and the top column is inserted through the mounting block.

4. A tooth reaming mold for preventing the tooth shaft from falling back according to claim 3, characterized in that: The diameter of the mounting block is larger than the diameter of the mounting hole, and the machine body is provided with a recess for the mounting block to be embedded at one end of the mounting hole.

5. The tooth reaming mold for preventing the tooth shaft from falling back according to claim 1, characterized in that: The body is equipped with an upper insert, an injection cavity is formed between the upper insert, the upper tooth shaft and the body, the upper insert is sleeved outside the upper tooth shaft, the top column is installed on the upper insert, and an outer edge for the top column to abut is installed outside the upper tooth shaft.

6. The tooth reaming mold for preventing the tooth shaft from falling back according to claim 1, characterized in that: The elastic member is a coil spring, and two ends of the coil spring are respectively against the machine body and the top column.

7. The tooth reaming mold for preventing the tooth shaft from falling back according to claim 1, characterized in that: The top column is pressed against one end of the upper tooth shaft and a ball is installed thereon.

8. The tooth reaming mold for preventing the tooth shaft from falling back according to claim 1, characterized in that: The top column can rotate around its own axis.

9. A tooth reaming mold for preventing the tooth shaft from falling back according to claim 8, characterized in that: A rotating bearing is installed between the top column and the machine body.

10. The tooth reaming mold for preventing the tooth shaft from falling back according to claim 1, characterized in that: The first driving member includes a power member, a driving gear and a driven gear meshing with the driving gear, the power member is installed on the body, the driving gear and the driven gear are respectively rotatably installed on the body, the power member is used to drive the driving gear to rotate, the upper tooth shaft is transmission connected with the driven gear, and the upper tooth shaft can slide axially relative to the driven gear.

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